JP7275022B2 - swivel work machine - Google Patents

Description

The present invention relates to a turning work machine such as a backhoe.

Patent Document 1 discloses a swing work machine that includes a swivel base, a diesel engine mounted on the swivel base, a work device provided on the swivel base, and a fuel tank containing light oil, which is fuel for the diesel engine. is disclosed.

JP 2017-66787 A

Diesel engines have good thermal efficiency and excellent fuel efficiency, but in recent years, due to the increasing awareness of the environment, there are cases where power sources with less environmental load are required.
SUMMARY OF THE INVENTION An object of the present invention is to provide a work machine that can be driven by fuel stored in a fuel cylinder.

A revolving work machine according to an aspect of the present invention includes a revolving base, a prime mover mounted at a rear portion of the revolving base, a bonnet forming an engine room that accommodates the prime mover, and a work device provided on the revolving base. and a support mechanism for supporting a fuel cylinder containing fuel for the prime mover, wherein the bonnet is configured to be openable and closable by being vertically swung, and the support mechanism supports the fuel cylinder with the An installation position where the hood and the engine are supported above the hood and at a position that restricts the opening and closing of the hood, and a position that rotates horizontally around an axis extending vertically from the installation position so as not to interfere with the opening and closing of the hood. movably supported to the retracted position.

According to the above-described work machine, the swing work machine can be driven by the fuel contained in the fuel cylinder.

Fig. 10 is a left rear perspective view showing the swivel base, bonnet and protection mechanism; Fig. 10 is a right rear perspective view showing the swivel base, bonnet and protection mechanism; It is a right rear perspective view showing a turning frame. FIG. 4 is a plan view showing a revolving frame; It is a top view which shows a bonnet. It is a left rear perspective view of the swivel base showing opening and closing of the bonnet. It is a right rear perspective view which shows attachment of a protection mechanism. It is a right front perspective view which shows a driver's seat, a console box, an operating device, and an armrest. Fig. 3 is a right rear perspective view showing the support; Fig. 4 is a left front perspective view showing the support; FIG. 4 is a diagram showing attachment and detachment of a cover to and from a support; It is a left rear perspective view which shows an accommodating part and an installation part. Fig. 10 is a right rear perspective view showing the base, first pivot bracket, first pivot shaft, second pivot bracket, and second pivot shaft; FIG. 10 is an exploded view showing the attachment of the base, first pivot bracket, first pivot shaft, second pivot bracket, and second pivot shaft; It is a left view which shows operation|movement of a locking mechanism. FIG. 11 is a right rear perspective view showing the swivel base and the support mechanism when the support mechanism is at the installation position K1; 4 is a plan view showing the bonnet and the support mechanism when the support mechanism is at the installation position K1; FIG. FIG. 10 is a left rear perspective view showing the swivel base and the support mechanism when the support mechanism is at the retracted position K2; 4 is a plan view showing the bonnet and the support mechanism when the support mechanism is at the retracted position K2; FIG. FIG. 11 is a left rear perspective view showing the swivel base and the support mechanism when the support mechanism is in the hanging position K3; FIG. 11 is a plan view showing the bonnet and the support mechanism when the support mechanism is in the hanging position K3; 1 is a schematic diagram showing a system of a turning work machine; FIG. FIG. 3 is a plan view showing an operating tool and a plurality of indicators; It is a right rear perspective view showing an exhaust structure. Fig. 10 is a right front perspective view showing the installation of the exhaust structure; FIG. 4 is a plan view of the exhaust structure; Fig. 10 is a right front perspective view showing the installation of the exhaust structure; It is a plane sectional view of an exhaust structure. It is a right-rear perspective view which shows the exhaust structure in a modification. It is a right front perspective view which shows attachment of the exhaust structure in a modification. Fig. 2 is a schematic side view showing a turning work machine; FIG. 2 is a schematic plan view showing a turning work machine; It is a side view of the rear part of a working machine. It is a side sectional view of an accommodating part.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 14 is a schematic side view showing the overall configuration of a backhoe that is a turning work machine (work machine) 1 according to this embodiment. FIG. 15 is a schematic plan view showing the overall configuration of the swing work machine 1. As shown in FIG.
As shown in FIG. 14 , the revolving work machine 1 includes a revolving base (body) 2 , a travel device 10 , and a work device 20 . A driver's seat 8 is provided on the swivel base 2 , and the periphery of the driver's seat 8 is covered with a protection mechanism 60 . In this embodiment, the front side of the operator seated in the driver's seat 8 of the swing work machine 1 (direction of arrow A1 in FIGS. 14 and 15) is forward, and the rear side of the operator (direction of arrow A2 in FIGS. 14 and 15) ) is the rear, the operator's left side (the front side in FIG. 14, the arrow B1 direction in FIG. 15) is the left side, and the operator's right side (the back side in FIG. 14, the arrow B2 direction in FIG. 15) is the right side. .

Also, the horizontal direction, which is a direction orthogonal to the longitudinal direction, will be described as the body width direction (see FIG. 15). The direction from the central portion of the swivel base 2 in the machine body width direction to the right portion or the left portion will be described as an outward direction. In other words, the outward direction is the width direction of the fuselage and the direction away from the center of the swivel base 2 in the width direction of the fuselage. The direction opposite to the outward direction is described as the inward direction (inner side). In other words, the inward direction is the width direction of the fuselage and the direction toward the center of the swivel base 2 in the width direction of the fuselage.

As shown in FIG. 14, the swivel base 2 is supported on the traveling frame 11 via the swivel bearing 3 so as to be rotatable (swiveable to the left and right) about a vertical axis (an axis extending in the vertical direction). ing. The center of the swivel bearing 3 is a swivel axis (swirl center). A swing motor (not shown) composed of a hydraulic motor is attached to the swivel base 2 . The swivel motor is a motor that drives the swivel base 2 to rotate about the swivel axis. The swing motor is provided below the protection mechanism 60 and below the front portion of the driver's seat 8, and is attached to a swing base plate 32, which will be described later.

As shown in FIG. 15, the swivel base 2 is provided with a prime mover 4 and a hydraulic pump 5 . That is, the prime mover 4 is mounted on the swivel base 2 , and more specifically, is arranged in an engine room E formed at the rear of the swivel base 2 . The prime mover 4 is a spark ignition engine that can be driven by fuel. A flywheel 4c is provided on the other side (right side) of the prime mover 4 in the machine body width direction, and a hydraulic pump 5 is provided on the right side of the flywheel 4c. The hydraulic pump 5 is driven by the driving force of the prime mover 4 and discharges hydraulic fluid (hydraulic pressure) for driving hydraulic actuators such as hydraulic motors and hydraulic cylinders equipped in the swing work machine 1 .

As shown in FIG. 14 , the travel device 10 has a travel frame 11 and a travel mechanism 12 . The traveling mechanism 12 is, for example, a crawler type. As shown in FIG. 15 , the traveling mechanisms 12 are provided on one side (left side) and the other side (right side) of the traveling frame 11 in the body width direction. As shown in FIG. 14, the travel mechanism 12 has an idler 13, drive wheels 14, a plurality of rollers 15, an endless crawler belt 16, and a travel motor 17 consisting of a hydraulic motor. The idler 13 is arranged at the front portion of the traveling frame 11 and the drive wheel 14 is arranged at the rear portion of the traveling frame 11 . A plurality of rollers 15 are provided between the idler 13 and the drive wheel 14 . The crawler belt 16 is wound around the idler 13 , the driving wheels 14 and the rollers 15 . The traveling motor 17 drives the drive wheels 14 to circulate the crawler belt 16 in the circumferential direction. A dozer device 18 is attached to the front portion of the traveling device 10 .

The work device 20 is provided on the swivel base 2 , more specifically, is provided at the front portion of the swivel base 2 and is operated by driving the prime mover 4 . As shown in FIGS. 14 and 15 , the work device 20 has a boom 23 , an arm 25 and a bucket (work tool) 27 . The base end side of the boom 23 is pivotally attached to the swing bracket 21 so as to be rotatable about a horizontal axis (an axis extending in the width direction of the machine body). This allows the boom 23 to swing vertically (vertically). The arm 25 is pivotally attached to the tip side of the boom 23 so as to be rotatable about a horizontal axis. This allows the arm 25 to swing back and forth or up and down. The bucket 27 is provided on the tip side of the arm 25 so as to be able to scoop and dump. Instead of or in addition to the bucket 27, the swing work machine 1 can be equipped with other work implements (hydraulic attachments) that can be driven by hydraulic actuators. Other working tools include hydraulic breakers, hydraulic crushers, angle blooms, earth augers, pallet forks, sweepers, mowers, snow blowers, and the like.

As shown in FIG. 14 , the swing bracket 21 is swingable by extension and contraction of a swing cylinder 22 provided on the right side of the swivel base 2 . The boom 23 is swingable by extension and contraction of the boom cylinder 24 . The arm 25 is swingable by extension and contraction of the arm cylinder 26 . The bucket 27 can perform squeezing and dumping operations by expanding and contracting a bucket cylinder (working tool cylinder) 28 . The swing cylinder 22 , the boom cylinder 24 , the arm cylinder 26 , and the bucket cylinder 28 are configured by hydraulic cylinders (hydraulic actuators), and are driven by hydraulic fluid discharged by the hydraulic pump 5 , that is, driven by the prime mover 4 .

The swivel base 2 will be described below. The swivel base 2 has a swivel frame 31 and a weight 38 attached to the rear portion of the swivel frame 31 . As shown in FIGS. 2A and 2B, the revolving frame 31 includes a revolving base plate (substrate) 32, a plurality of vertical ribs (first vertical ribs 33 and second vertical ribs 34), support brackets 35, and partition plates 36. and a support frame 37 . Further, the revolving frame 31 is provided with brackets, stays, and the like for attaching devices, tanks, and other parts to be mounted on the revolving base 2 .

The swivel base plate 32 is formed of a thick steel plate or the like, and is arranged so that the plate surface faces the up-down direction. The swivel base plate 32 is rotatably supported on the travel device 10 via the swivel bearing 3 around the swivel axis.
As shown in FIGS. 2A and 2B, the first vertical ribs 33 and the second vertical ribs 34 are members that reinforce the swivel base plate 32 and extend from the front portion to the rear portion of the swivel base plate 32 . there is The first vertical rib 33 and the second vertical rib 34 are erected on the turning base plate 32 and arranged side by side apart from each other in the machine body width direction. The first longitudinal rib 33 is arranged on the left side of the swivel base plate 32 and the second longitudinal rib 34 is arranged on the right side of the swivel base plate 32 .

As shown in FIGS. 2A and 2B, the support bracket 35 is provided in front of the first longitudinal rib 33 and the second longitudinal rib 34 . The support bracket 35 and the front portions of the first vertical rib 33 and the second vertical rib 34 are provided at a position deviated rightward from the center of the turning base plate 32 in the body width direction. As shown in FIG. 14, a swing bracket 21 is attached to the support bracket 35 so as to be capable of swinging about a vertical axis (an axis extending in the vertical direction). is installed.

The partition plate 36 is a member that partitions the front lower portion of the engine room E. As shown in FIG. As shown in FIGS. 2A and 2B , the partition plate 36 has a plate surface facing in the front-rear direction, and is arranged from one side (left side) to the other side (right side) in the width direction of the fuselage at the rear portion of the turning base plate 32 . It is
As shown in FIGS. 2A and 2B, the support frame 37 is erected behind the partition plate 36 at the rear portion of the swivel base plate 32 . The support frame 37 is arranged in the bonnet 40 (engine room E) and supports the bonnet 40 and peripheral parts of the prime mover 4 . The support frame 37 includes a plurality of leg members (a first leg 37a, a second leg 37b, and a third leg 37c) erected on the turning base plate 32, and a rod member 37d fixed to the top of these leg members. and have

The first leg 37a has a first strut portion 37a1 and a first extension portion 37a2. As shown in FIGS. 2A and 2B, the first strut portion 37a1 is erected on the left side of the front portion of the engine room E and extends vertically. Specifically, the lower end of the first column portion 37a1 is attached to the rear left side of the partition plate 36 . The first extending portion 37a2 extends rearward and upward from the upper end of the first supporting column portion 37a1, bends in the middle, and extends substantially upward.

The second leg 37b has a second strut portion 37b1 and a second extension portion 37b2. As shown in FIGS. 2A and 2B, the second column portion 37b1 is erected on the right front portion of the engine room E and extends vertically. Specifically, the lower end of the second strut portion 37b1 is attached to the rear right side of the partition plate 36 . The second extending portion 37b2 extends rearward and upward from the upper end of the second supporting column portion 37b1, bends in the middle, and extends substantially upward.

The third leg 37c has a third support portion 37c1 and a third extension portion 37c2. As shown in FIGS. 2A and 2B, the third column portion 37c1 is erected in the rear portion of the engine room E and extends vertically. The third extending portion 37c2 extends forward and upward from the upper end of the third support portion 37c1, bends in the middle, and extends forward.
As shown in FIG. 2A, the rod member 37d is arranged so as to extend in the machine body width direction so that the plate surface faces the vertical direction, and the upper end of the first extending portion 37a2 and the upper end of the second extending portion 37b2 are arranged. , and the upper end of the third extension 37c2, and fixed to each of these extensions.

As shown in FIGS. 1A and 1B, the weights 38 form the lower left side, lower right side, and lower back of the engine room E. As shown in FIGS.
Devices mounted on the rear portion of the swivel base 2 will be described below. As shown in FIG. 3A and the like, the swivel base 2 is mounted with a fuel tank 50, a radiator 52, an oil cooler 53, and an exhaust structure . The fuel tank 50 is a tank that stores fuel (gasoline, first fuel in this embodiment) to be supplied to the prime mover 4 . The fuel tank 50 is arranged on the other side (right side) of the swivel base 2 in the fuselage width direction, more specifically, on the right side of the driver's seat 8 . The fuel tank 50 includes a tank body 50a and a filler port 50b communicating with the tank body 50a. The fuel tank 50 is a hollow resin product formed by blow molding, rotational molding, or the like. The fuel tank 50 is not limited to resin products, and may be made of metal. The fuel filler port 50b extends upward and to the right, for example, from the top of the tank body 50a. The fuel filler port 50b opens upward to the upper right, and its end can be opened and closed by a fuel cap.

The radiator 52 is a device that cools the coolant of the prime mover 4 . The oil cooler 53 is a device that cools the working oil returning to the working oil tank. As shown in FIG. 3A, the radiator 52 and the oil cooler 53 are arranged to the left of the prime mover 4 and arranged side by side along the width direction of the machine body. Specifically, the radiator 52 is arranged closer to the prime mover 4 than the oil cooler 53 is. That is, the radiator 52 is arranged on the left side of the prime mover 4 and the oil cooler 53 is arranged on the left side of the radiator 52 . The oil cooler 53 is arranged to face the radiator 52 . A cooling fan driven by the driving force of the motor 4 is provided between the radiator 52 and the motor 4 . This cooling fan is a suction type fan, and sucks air from the left side of the oil cooler 53 and flows it to the motor 4 side.

As shown in FIG. 3A , the exhaust structure 54 is arranged on the other side of the swivel base 2 in the body width direction, and is connected to an exhaust manifold (not shown) of the prime mover 4 . The temperature and noise of the exhaust gas (exhaust gas) discharged from the prime mover 4 are reduced and harmful substances are removed, and the exhaust gas is discharged to the outside.
The exterior cover provided on the swivel base 2 and covering the prime mover 4, the hydraulic pump 5, the fuel tank 50, the battery, the hydraulic oil tank, the radiator 52, and the oil cooler 53 will be described below. The exterior cover has a bonnet 40 . As shown in FIGS. 3A and 3B, the bonnet 40 is a cover that mainly covers the prime mover 4 and forms an engine room E in which the prime mover 4 is accommodated. The bonnet 40 includes a bonnet center 41 , a rear bonnet 42 , a first side bonnet 43 and a second side bonnet 44 .

As shown in FIG. 3A, the bonnet center 41 is a cover member that covers the top and front of the prime mover 4, and isolates the interior of the protection mechanism 60 from the engine room E. As shown in FIG. The bonnet center 41 is fastened to the upper part of the rod member 37 d with a fastening member such as a bolt, and the lower part of the bonnet center 41 is attached to the upper part of the partition plate 36 .
The rear bonnet 42 is a cover member that covers the rear of the prime mover 4, is pivotably connected to the support frame 37, and can be opened and closed as shown in FIG. 3B. Specifically, the front portion of the rear bonnet 42 is swingably connected to the support frame 37 by a hinge structure 45, and can be opened and closed around the swing axis of the hinge. In other words, the bonnet 40 can be opened and closed.

As shown in FIG. 3B , the first side bonnet 43 is a cover member that covers the left side of the prime mover 4 and the hydraulic pump 5 . The second side bonnet 44 is a cover member that covers the right side of the prime mover 4 , radiator 52 and oil cooler 53 . The second side bonnet 44 is formed with an opening for taking air into the engine room E (bonnet 40).
Next, the hinge structure 45 that supports the rear bonnet 42 will be described. The hinge structure 45 is arranged inside the rear bonnet 42 in the vehicle body width direction, and the hinge structure 45 includes a fixed hinge 45a. As shown in FIG. 2A, the fixed hinge 45a is fixed to the support frame 37 fixed to the top of the rod member 37d. The fixed hinge 45a is formed of a thick steel plate, and is fixed to the inner side of the support frame 37 in the body width direction and to one side (left side) and the other side (right side). The fixed hinge 45 a extends rearward from the lower portion of the support frame 37 . A hinge shaft (not shown) extending in the body width direction is provided on the tip side (rear side) of the fixed hinge 45a, and the fixed hinge 45a supports the rear bonnet 42 swingably via the hinge shaft. are doing. That is, the rear bonnet 42 swings upward about the hinge shaft to open the inside and outside of the engine room E, and swings downward about the hinge shaft to connect the inside and the outside of the engine room E. can be switched to a closed state to block the

As shown in FIGS. 1A, 1B, and 3B, the rear bonnet 42 is provided with a lock lever 45b. Specifically, for example, the lock lever 45b is provided at the lower portion of the rear bonnet 42 and is a member that maintains the closed state of the rear bonnet 42 . The lock lever 45b can be operated to swing in the vertical direction, and can be operated to engage with a member to be engaged (not shown) such as a striker provided inside the engine room E or to release the engagement. can be done. That is, when the rear bonnet 42 is to be opened, the operator pulls up the lock lever 45b to release the engagement between the lock lever 45b and the locked member, and pulls up the rear bonnet 42 . The hinge structure 45 only needs to support the rear bonnet 42 so as to be switchable between an open/closed state and a closed state, and conventional techniques can be applied, and the structure is not limited to the above configuration.

The protection mechanism 60 provided on the swivel base 2 and covering the driver's seat 8 will be described below. As shown in FIGS. 1A, 1B, 14, and 15, the protection mechanism 60 is mounted near the rear of the swivel base 2 and protects the driver's seat 8. As shown in FIGS. As shown in FIGS. 1A and 1B, the protection mechanism 60 has a pillar 61 and a roof 62 . The struts 61 are arranged at least above the bonnet 40 and are spaced apart in the machine width direction. In this embodiment, the protection mechanism 60 has a four-post structure including a pair of posts 61 arranged and provided in the front part of the swivel base 2 and a pair of posts 61 provided above the bonnet 40. is the canopy of In other words, the protection mechanism 60 may be configured to have at least a first rear strut 61b1 and a second rear strut 61b2, which will be described later, and may be a canopy with a two-pillar structure or a three-pillar structure, or a cabin. . The struts 61 include a pair of front struts 61 a supporting the front portion of the roof 62 and a pair of rear struts 61 b supporting the rear portion of the roof 62 .

As shown in FIGS. 1A and 1B, the pair of front struts 61a is a first front strut 61a1 arranged on one side (left side) in the body width direction of the swivel base 2, and a first front strut 61a1 arranged on the other side (right side). and a second front strut 61a2. The first front strut 61a1 and the second front strut 61a2 are spaced apart from each other in the width direction of the vehicle body at the front portion of the swivel base 2 and extend in the vertical direction. The first front strut 61 a 1 and the second front strut 61 a 2 are located at the front corner of the protection mechanism 60 and support the front corner of the roof 62 .

As shown in FIGS. 1A and 1B, the pair of rear struts 61b is a first rear strut 61b1 arranged on one side (left side) of the swivel base 2 in the body width direction, and a first rear strut 61b1 arranged on the other side (right side). and a second rear strut 61b2. The first rear strut 61b1 and the second rear strut 61b2 are spaced apart from each other in the machine body width direction at the rear portion of the swivel base 2 and extend in the vertical direction. The first rear strut 61 b 1 and the second rear strut 61 b 2 are located at the rear corner of the protection mechanism 60 and support the rear corner of the roof 62 .

As shown in FIGS. 1A, 1B, 14, and 15, the roof 62 is a substantially plate-like structure that covers the upper portion of the driver's seat 8. The roof 62 is positioned above the support 61 so that the plate surface faces the vertical direction. supported by The roof 62 extends from the front portion to the rear portion of the swivel base 2 and extends from one side (left side) to the other side (right side) of the swivel base 2 in the body width direction.
As shown in FIGS. 1A, 1B, and 4A, a front lower frame 63 is provided at the lower end of the front portion of the protection mechanism 60 . The front lower frame 63 is provided between the lower end of the first front column 61a1 and the lower end of the second front column 61a2. That is, the front lower frame 63 extends in the width direction of the fuselage, and the first front strut 61 a 1 , the second front strut 61 a 2 , the roof 62 , and the front lower frame 63 extend inside the protection mechanism 60 and in front of the protection mechanism 60 . forming a window in the front of the protection mechanism 60 that communicates with the

Further, as shown in FIGS. 1A, 1B, and 4A, a rear lower frame 64 is provided at the lower end portion of the rear portion of the protection mechanism 60 . The rear lower frame 64 is provided between the lower end of the first rear strut 61b1 and the lower end of the second rear strut 61b2. The rear lower frame 64 is provided at a position higher than the front lower frame 63 . The rear lower frame 64 extends in the width direction of the fuselage, and the first rear strut 61b1, the second rear strut 61b2, the roof 62, and the rear lower frame 64 separate the inside of the protection mechanism 60 from the rear of the protection mechanism 60. It forms a rear window of the protective mechanism 60 that communicates.

The support on the front side of the protection mechanism 60 will be described below. As shown in FIG. 4A , the swivel base 2 includes front mount members 39 (first front mount 39 a and second front mount 39 b ) that support the front lower frame 63 . The first front mount 39 a is provided on one side (left side) of the front portion of the swivel base 2 in the body width direction, and more specifically, is arranged on the left side of the swing bracket 21 . The first front mount 39a is attached to the left side of the front lower frame 63 with fastening members such as bolts.

On the other hand, the second front mount 39 b is provided on the other side (right side) of the front portion of the swivel base 2 in the body width direction, and more specifically, is arranged on the right side of the swing bracket 21 . The second front mount 39b is attached to the right side of the front lower frame 63 with fastening members such as bolts.
A conventional technique can be applied to support the front side of the protection mechanism 60 . It may be configured to be supported and vibration-isolated, and is not limited to the above configuration.

The surroundings of the driver's seat 8 inside the protection mechanism 60 will be described below. As shown in FIG. 4B , around the driver's seat 8 are provided a console box (operating table) 70 , an operating device 71 for operating the swing work machine 1 , and an armrest 75 . A pair of console boxes 70 are arranged on the sides of the driver's seat 8 , that is, on both sides in the width direction of the vehicle body, and extend from the front part of the driver's seat 8 to the rear of the driver's seat 8 . The rear portion of the console box 70 arranged on the other side (right side) in the width direction of the vehicle body overlaps the backrest portion 8a of the driver's seat 8 in the front-rear direction.

The operating device 71 is a device capable of operating the revolving work machine 1 by being operated by an operator. As shown in FIG. 4B, the operating device 71 includes a first control lever 72, a second control lever 73, and a setting dial 74. A first control lever 72 , a second control lever 73 , and a setting dial 74 are provided above the console box 70 .
The first control lever 72 is arranged on the upper front side of the console box 70 on one side (left side) in the machine width direction, and is a device capable of operating the boom 23 and the bucket 27 .

The second control lever 73 is arranged above the console box 70 on the other side (right side) in the machine width direction, and is a device capable of turning and operating the arm 25 .
The setting dial 74 is arranged, for example, on the upper rear side of the console box 70 on the other side (right side) of the driver's seat 8 . The setting dial 74 is a dial-shaped switch such as a selector switch having a plurality of switching positions, and can set the rotation speed of the prime mover 4 .

As shown in FIG. 4B, the armrests 75 are provided on the sides of the driver's seat 8, that is, on one side (left side) and the other side (right side) of the driver's seat 8 in the machine width direction. The armrest 75 is a member on which an operator seated in the driver's seat 8 rests his elbow or arm while gripping the control lever. For example, the armrest 75 on one side (left side) in the width direction of the aircraft body is located above the console box 70 and behind the first control lever 72 . The armrest 75 on the other side (right side) in the width direction of the machine body is located above the console box 70 and between the second control lever 73 and the setting dial 74 .

The armrest 75 has a standing portion 75a and a placement portion 75b. The erected portion 75a is a portion erected upward from the upper portion of the console box 70 and supports the mounting portion 75b. The placing portion 75b is a portion on which the operator places his elbow or arm, and extends rearward from the upper portion of the standing portion 75a.
As shown in FIGS. 1, 2, 10, 14, etc., the swing work machine 1 includes a fuel cylinder 130 (contained object) that contains fuel (gaseous fuel, second fuel). The fuel cylinder 130 is, for example, a cylindrical container with a bottom, and stores therein the compressed second fuel in the state of compressed gas or liquid. That is, the fuel cylinder 130 is a high-pressure gas container. The second fuel is a fuel that drives the prime mover 4, such as compressed natural gas (CNG), liquefied natural gas (LNG), compressed petroleum gas (CPG), and liquefied petroleum gas (LPG). The second fuel stored in fuel cylinder 130 is supplied to prime mover 4 via a hose connected to fuel cylinder 130 .

As shown in FIGS. 1A, 1B, 4A, etc., the swing work machine 1 is provided with a housing portion 81 formed between the bonnet 40 and the strut 61 and housing a fuel cylinder 130 (a container). As a result, the swing work machine 1 can effectively utilize the space between the bonnet 40 and the strut 61 to secure a space for accommodating the fuel cylinder 130 . The revolving work machine 1 also includes a support 80 that supports the strut 61 and forms a housing portion 81 . The support 80 is provided on the swivel base 2 and supports the support 61 arranged above the bonnet 40 among the supports 61 of the protection mechanism 60 . For example, the support 80 is arranged at the rear of the swivel base 2 and supports the rear strut 61b.

As shown in FIG. 5A, the support 80 has a bottom member 82, a frame body 83, vertical members 84, and a top member 85. As shown in FIG. The bottom member 82 is a portion that constitutes the lower portion of the support body 80. The bottom member 82 is arranged so that the plate surface faces in the vertical direction, and the length in the width direction of the fuselage and the length in the longitudinal direction are longer than the length in the vertical direction. It is a plate-like portion. The bottom member 82 is positioned above the bonnet center 41 (bonnet 40) and is fastened to the upper portion of the rod member 37d (support frame 37) via the bonnet center 41 with fastening members such as bolts.

As shown in FIGS. 5A, 5B, and 6A, the frame body 83 is provided above the bottom member 82 and supports a mounting portion 86 (to be described later) on the swivel base 2 . The frame body 83 is formed by bending a hollow pipe member, for example, and includes a first column portion 83a, a second column portion 83b, and a connecting rod 83c. The first column portion 83a constitutes one side (left side) of the frame body 83, and the second column portion 83b constitutes the other side (right side) of the frame body 83. As shown in FIG. The first column portion 83a and the second column portion 83b are erected on the upper portion of the bottom member 82 so as to be separated from each other in the width direction of the machine body.

As shown in FIGS. 5B and 6A, the first column portion 83a includes a first portion 83a1 extending upward from the front side of the bonnet 40 and a second portion 83a2 curving rearward from the upper end of the first portion 83a1. and have The first portion 83a1 extends upward from the upper left end of the bottom member 82 . The rear end side of the second portion 83a2 curves rightward. The second column portion 83b has a first portion 83b1 extending upward from the front side of the bonnet 40 and a second portion 83b2 curving rearward from the upper end portion of the first portion 83b1. The first portion 83b1 extends upward from the upper left end of the bottom member 82 . The rear end side of the second portion 83b2 curves leftward. That is, the bonnet 40 (rear bonnet 42), the first portions 83a1, 83b1, and the second portions 83a2, 83b2 form the accommodation portion 81 by surrounding the space above the bonnet 40. As shown in FIG.

As shown in FIGS. 5A, 5B, and 6A, the connecting rod 83c extends between the upper end of the first column portion 83a and the upper end of the second column portion 83b. It connects the two pillars 83b.
As shown in FIGS. 5A, 5B, and 6A, the vertical member 84 extends upward from the front side of the bonnet 40 . That is, the vertical member 84 is arranged between the front side of the bonnet 40 and the rear side of the backrest portion 8 a of the driver's seat 8 , separating the driver's seat 8 and the fuel cylinder 130 . The vertical member 84 connects the front portion of the lower end side of the first column portion 83a and the front portion of the lower end side of the second column portion 83b of the frame body 83, and has a length in the vertical direction and a length in the machine width direction. is longer than the length in the front-rear direction, and the plate-like member is arranged so that the plate surface faces in the front-rear direction.

As shown in FIGS. 5A, 5B, and 6A, the vertical member 84 includes a recess 84a recessed forward in the central portion. The recessed portion 84a has a pair of side portions 84a1 and an inclined portion 84a2. The side portions 84a1 are spaced apart in the width direction of the machine body, and the lengths in the front-rear direction and the length in the vertical direction are longer than the lengths in the width direction of the machine body. is.

As shown in FIG. 5B, the inclined portion 84a2 is bent along the front edges of the pair of side portions 84a1. Specifically, the edge on one side (left side) of the inclined portion 84a2 is connected to the edge of the left side portion 84a1, and the edge on the other side (right side) is connected to the edge of the right side portion 84a1. .
The upper member 85 extends rearward from the upper portion of the vertical member 84 , extends from one side (left side) to the other side (right side) in the width direction of the vehicle body, and is positioned above the bonnet 40 . As shown in FIG. 5B, the upper member 85 connects the upper end side of the first column portion 83a and the upper end side of the second column portion 83b, extends to the connecting rod 83c, and extends from the upper end portion of the vertical member 84 to the first column portion. It curves rearward and upward along the middle portion of 83a and the middle portion of the second column portion 83b. The upper member 85 covers the hood 40 together with the vertical member 84 . Thus, the bonnet 40 , the vertical member 84 , and the upper member 85 form the accommodation portion 81 by surrounding the space above the bonnet 40 .

The attachment portion 86 is a portion to which the support 61b of the protection mechanism 60 is attached. As shown in FIGS. 5A and 5B, the mounting portion 86 is connected to the upper portion of the support body 80, more specifically, to the frame body 83, and is connected to one side (left side) and the other side of the upper member 85 in the machine width direction. (Right side) and (right side) are plate-shaped members provided so that the plate surface faces the vertical direction. That is, the mounting portion 86 supports the rear support 61b by being connected to the rear lower frame 64 of the protection mechanism 60, and the rear support 61b (support 61) is connected to the first support via the mounting portion 86. 83a, the second column portion 83b, and one side (left side) and the other side (right side) of the upper member 85 in the machine body width direction. The mounting portion 86 and the rear lower frame 64 are fastened together by fastening members such as bolts. Therefore, the protection mechanism 60 is supported by the swivel base 2 via the mounting portion 86 , that is, the support 80 . As a result, the load from the roof 62 can be distributed between one side (left side) and the other side (right side) of the upper member 85 in the vehicle body width direction. The mounting portion 86 may have anti-vibration rubber so as to support the rear portion of the protection mechanism 60 with respect to the swivel base 2 for anti-vibration. Applicable and not limited to the above configurations.

In the above-described embodiment, the rear strut 61b (strut 61) is supported by the first pillar 83a and the second pillar 83b of the support 80. The first column portion 83a and the column 61 (the first rear column 61b1) are integrally formed, and the second column portion 83b and the column 61 (the second rear column 61b2) Even in a configuration in which the bonnet 40, the first portions 83a1 and 83b1 of the support 61, and the second portions 83a2 and 83b2 of the support 61 are integrally formed to form the accommodation portion 81 by surrounding the space. good. In this case, the strut 61 includes first portions 83a1 and 83b1 extending upward from the front side of the bonnet 40, and second portions 83a1 and 83b1 curved rearward from the upper ends of the first portions 83a1 and 83b1 and arranged above the bonnet 40. It has portions 83a2 and 83b2 and a third portion (rear strut) 61b extending upward from the upper portions of the second portions 83a2 and 83b2.

As shown in FIGS. 1B, 5C, and 14, the accommodation portion 81 may include a cover 87 that covers the rear side of the accommodation space. As shown in FIG. 5C, the cover 87 has a rear wall portion 87a and a peripheral wall portion 87b. The rear wall portion 87a is arranged so that the plate surface faces in the front-rear direction, the length in the width direction of the aircraft body is longer than the length in the vertical direction, and the length in the front-rear direction is the length in the width direction of the aircraft body and the length in the vertical direction. It is a substantially rectangular plate-like portion that is shorter than the length. The peripheral wall portion 87b extends forward from at least a portion of the outer periphery of the rear wall portion 87a and surrounds a space in front of the rear wall portion 87a. For example, the peripheral wall portion 87b extends from one side (left side) and the other side (right side) of the rear wall portion 87a. Note that the cover 87 may be attached to the frame body 83 by fastening members such as bolts, or may be attached by fitting with the frame body 83, and the attachment method is not limited. Also, the cover 87 may be attached to the support 80 so as to be openable and closable. For example, the cover 87 may be attached to an extension portion 114, which will be described later, or a hinge provided on the connecting rod 83c.

As shown in FIGS. 1A, 1B, 5A, etc., the support 80 has a support mechanism 90 that supports the fuel cylinder 130 . In other words, the swing work machine 1 includes the support mechanism 90 . The support mechanism 90 can support the fuel cylinder 130 above the bonnet 40 . Hereinafter, the state in which the support mechanism 90 supports the fuel cylinder 130 above the bonnet 40 (rear bonnet 42), that is, the state in which the fuel cylinder 130 is accommodated in the accommodation portion 81 will be described as an installation position (accommodation position) K1. The support mechanism 90 will be described by taking the state where the support mechanism 90 is at the installation position K1 as an example.

6A, 6B, and 6C, the support mechanism 90 includes a base 91, a first pivot shaft 94, a first pivot bracket 95, a second pivot shaft 101, a second pivot A bracket 102 and an installation portion 106 are provided. The base 91 supports a first pivot shaft 94 . The first pivot shaft 94 is a shaft extending in the vertical direction, and pivotally supports the fuel cylinder 130 so as to be rotatable in the horizontal direction. The first pivot bracket 95 connects the first pivot shaft 94 and the second pivot shaft 101 and rotates around the first pivot shaft 94 . The second pivot shaft 101 pivotally supports the fuel cylinder 130 so as to be vertically rotatable, and more specifically, is a shaft portion extending in a direction perpendicular to the first pivot shaft 94 . The second pivot bracket 102 connects the second pivot shaft 101 and the installation portion 106 and rotates around the second pivot shaft 101 . The installation portion 106 is a portion where the fuel cylinder 130 is installed. Below, the base portion 91, the first pivot shaft 94, the first pivot bracket 95, the second pivot shaft 101, and the installation portion 106 will be described in detail.

As shown in FIG. 6B, the base portion 91 is connected to one end (upper end) and the other end (lower end) of the first pivot shaft 94 in the vertical direction. 1 pivot shaft 94 is supported. As shown in FIGS. 6B and 6C, the base 91 includes an upper pivot portion 92 that supports the upper end of the first pivot shaft 94 and a lower pivot portion 93 that supports the lower end of the first pivot shaft 94. I'm in.
As shown in FIG. 6B, the upper pivotal support portion 92 protrudes rearward from the middle portion of the second column portion 83b in the vertical direction. The upper pivot support part 92 is arranged so that the plate surface faces in the vertical direction, the length in the front-rear direction is longer than the length in the width direction of the machine body, and the length in the up-down direction is shorter than the lengths in the width direction and the front-back direction of the machine body. It is a plate-like portion. A hole 92a penetrating in the vertical direction is formed in the rear portion of the upper pivot portion 92. The first pivot shaft 94 is inserted through the hole 92a and fixed to the upper end of the first pivot shaft 94 by welding or the like. be done. As shown in FIG. 6C, one side (left side) of the first pivot shaft 94 in the upper pivot portion 92 is formed with a first lock hole 92b penetrating vertically.

As shown in FIGS. 6B and 6C, the lower pivotal support portion 93 is a portion that extends rearward from the end portion of the bottom member 82 on the other side (right side) in the machine body width direction. The lower pivot support portion 93 is arranged so that the plate surface faces in the vertical direction, the length in the front-rear direction is longer than the length in the width direction of the fuselage, and the length in the up-down direction is the length in the width direction of the fuselage and the length in the width direction of the fuselage. It is a plate-like portion that is shorter than the length. As shown in FIG. 6C, the lower pivot portion 93 is formed with a hole 93a penetrating vertically, and the center of the hole 93a coincides with the center of the hole 92a of the upper pivot portion 92 in the horizontal direction. The first pivot shaft 94 is inserted through the hole 93a of the lower pivot portion 93 and fixed to the lower end of the first pivot shaft 94 by welding or the like. A rear edge (rear edge portion) of the lower pivotal support portion 93 is formed in a substantially circular arc concentric with the center of the hole 93a in a plan view. A notch 93b is formed on the other side (right side) of the rear edge portion of the lower pivot portion 93. As shown in FIG. The notch 93b includes a first end face 93b1 and a second end face 93b2. The first end surface 93b1 is a surface of the notch 93b facing rightward, and the second end surface 93b2 is a surface of the notch 93b facing rearward.

As shown in FIG. 6C, the first pivot shaft 94 is supported by the upper pivot portion 92 and the lower pivot portion 93 of the base portion 91, and pivotally supports the first pivot bracket 95 so as to be rotatable about the axis. do. Thereby, the first pivot shaft 94 pivotally supports the fuel cylinder 130 installed in the installation portion 106 so as to be able to rotate in the horizontal direction.
As shown in FIGS. 6B and 6C, the first pivot bracket 95 includes a first tubular portion 96, an upper pivot piece 97, a lower pivot piece 98, a second tubular portion 99, and a vertical pivot portion 100. and includes The first tubular portion 96 is a tubular portion having an inner diameter smaller than the outer diameter of the first pivot shaft 94 and through which the first pivot shaft 94 is inserted. The first tubular portion 96 extends from the lower end of the upper pivotal support portion 92 to the upper end of the lower pivotal support portion 93 . The vertical length of the first tubular portion 96 is shorter than the vertical length of the first pivot shaft 94 , the upper end of the first pivot shaft 94 protrudes from the upper end of the first tubular portion 96 , and the first tubular portion 96 has a vertical length. A lower end of the first pivot shaft 94 protrudes from a lower end of the tubular portion 96 .

As shown in FIGS. 6B and 6C , the upper pivot piece 97 is a plate-like portion extending radially outward of the first cylindrical portion 96 from the upper portion of the first cylindrical portion 96 . The upper pivot piece 97 is arranged so that the plate surface faces the vertical direction. As shown in FIG. 6C, the front portion of the upper pivot piece 97 is formed with a first locked hole 97a penetrating vertically. The first locked hole 97 a is arranged on the circumference of a virtual circle concentric with the axis of the first pivot shaft 94 .

As shown in FIGS. 6B and 6C, the lower pivot piece 98 is arranged with its plate surface facing in the front-rear direction, and extends from the lower surface of the upper pivot piece 97 to the lower portion of the first cylindrical portion 96 . It is a plate-like portion extending radially outward of the cylindrical portion 96 . The upper end of the lower pivot piece 98 and the lower surface of the upper pivot piece 97 are connected. A hole 98a for supporting the second cylindrical portion 99 is formed. As shown in FIG. 6C, above the hole 98a of the lower pivot piece 98, a plurality of second locked holes 98b penetrating in a direction orthogonal to the second pivot shaft 101 (front-rear direction) are formed. . The plurality of second locked holes 98b are arranged on the circumference of an imaginary circle that is concentric with the axis of the second pivot shaft 101 . In this embodiment, two second locked holes 98 b are formed in the lower pivot piece 98 .

The second tubular portion 99 is a tubular portion arranged to face in the front-rear direction, supported in the hole 98a of the lower pivot piece 98, and through which the second pivot shaft 101 is inserted. The inner diameter of the second tubular portion 99 is smaller than the outer diameter of the second pivot shaft 101 . The front end of the second tubular portion 99 is connected to the rear side of the hole 98a of the lower pivot piece 98 and extends rearward from the hole 98a.
As shown in FIGS. 6B and 6C, the vertical pivot portion 100 extends upward from the right portion of the upper pivot piece 97, and is a vertically long portion arranged so that the plate surface faces the front-rear direction. is. The upper portion of the vertical pivot portion 100 supports the upper side (for example, the bottom side) of the gas damper 115 so as to be able to swing.

As shown in FIG. 6B, the second pivot shaft 101 is supported by the second cylindrical portion 99 of the first pivot bracket 95 and pivotally supports the installation portion 106 so as to be rotatable about the axis. The two pivot shafts 101 pivotally support a fuel cylinder 130 installed in the installation portion 106 so as to be vertically rotatable. The length of the second pivot shaft 101 in the front-rear direction is longer than the length of the second tubular portion 99 in the front-rear direction. The rear end of the two pivot shafts 101 protrudes from the rear end of the second tubular portion 99 .

As shown in FIGS. 6A and 6C, the second pivot bracket 102 includes a first connecting plate 103, a second connecting plate 104, and a third connecting plate 105. As shown in FIGS. The first connecting plate 103, the second connecting plate 104, and the third connecting plate 105 are separated from each other in the front-rear direction and are connected to the other side (right side) of the installation portion 106 in the machine body width direction. support the right side of the The first connecting plate 103 is a plate-like portion that protrudes rightward from the right rear portion of the installation portion 106 and extends downward to the right. As shown in FIG. 6C, a hole 103a is formed through the lower part of the first connecting plate 103 in the front-rear direction, and the hole 103a and the rear end of the second pivot shaft 101 are connected. .

As shown in FIGS. 6A and 6C, the second connecting plate 104 is a plate-shaped portion that protrudes rightward from the right front portion of the installation portion 106 and extends downward and to the right. A hole 104a is formed through the lower part of the second connecting plate 104 in the front-rear direction, and the hole 104a and the front end of the second pivot shaft 101 are connected. Accordingly, the installation portion 106 is supported by the first connecting plate 103 and the second connecting plate 104 so as to be swingable about the axis of the second pivot shaft 101 . Further, as shown in FIG. 6C, the upper portion of the second connecting plate 104 is formed with a second lock hole 104b penetrating in a direction orthogonal to the second pivot shaft 101 (front-rear direction).

As shown in FIGS. 6A and 6C , the third connecting plate 105 is a plate-shaped portion that protrudes rightward from the middle portion of the right side of the installation portion 106 in the front-rear direction and extends rightward and downward. The lower side (for example, the rod side) of the gas damper 115 is connected to the distal end side of the third connecting plate 105 . Therefore, the first pivot bracket 95 and the second pivot bracket 102 are connected via a gas damper 115 .

As shown in FIG. 6A, the installation portion 106 detachably supports the fuel cylinder 130 . The installation portion 106 has a first installation rod 107 , a second installation rod 108 , a right side connecting wall 109 , a left side connecting wall 110 and a plurality of connecting portions 111 . The first installation rod 107 and the second installation rod 108 are rod-shaped portions extending in the width direction of the fuselage and are spaced apart in the front-rear direction. Specifically, the first installation rod 107 constitutes the front portion of the installation portion 106 , and the second installation rod 108 constitutes the rear portion of the installation portion 106 . The first installation rod 107 and the second installation rod 108 support the fuel cylinder 130 thereabove.

As shown in FIG. 6A , the right side connecting wall 109 and the left side connecting wall 110 are arranged so that their plate surfaces face the width direction of the fuselage, the length in the longitudinal direction is longer than the length in the vertical direction, and the length in the width direction of the fuselage is longer than the length in the vertical direction. is a plate-like portion whose length is shorter than the length in the front-rear direction and the length in the vertical direction, and connects the first installation rod 107 and the second installation rod 108 . Specifically, the right side connecting wall 109 is a portion forming the right side of the installation section 106 and connects the right end of the first installation rod 107 and the right end of the second installation rod 108 . On the other hand, the left connecting wall 110 constitutes the left side of the installation portion 106 and connects the left end of the first installation rod 107 and the left end of the second installation rod 108 .

As shown in FIG. 6A , the plurality of connection parts 111 are parts that connect the first installation rod 107 and the second installation rod 108 separately from the right side connection wall 109 and the left side connection wall 110 . The plurality of connecting portions 111 are, for example, rod-shaped members extending in the front-rear direction, and are connected to the rear portion of the first setting rod 107 at the front side and connected to the front portion of the second setting rod 108 at the rear side. The plurality of connecting portions 111 are arranged apart in the body width direction, and for example, a pair is arranged on the other side (right side) of the first installation rod 107 and the second installation rod 108 in the body width direction.

Also, as shown in FIG. 5C, the mounting portion 106 has a fastener 112 . The fastener 112 is a member that fixes the fuel cylinder 130 installed on the installation portion 106 . As a result, the support mechanism 90 can firmly support and fix the fuel cylinder 130 with the fastener 112 . The fastener 112 is, for example, a belt that wraps around the fuel canister 130 from the rear to the front to fix the fuel canister 130 to the first installation rod 107 and the second installation rod 108 . A hook is provided at one end of the fastener 112, and an endless loop is formed at the other end so that a shaft portion 113b1, which will be described later, is inserted therein. A buckle or the like is provided at an intermediate portion of the fastener 112, and the length can be adjusted.

As shown in FIG. 6A, the installation portion 106 has a plurality of belt attachment portions 113. As shown in FIG. The belt attachment portion 113 is a portion to which the fastener 112 is attached. Two belt attachment portions 113 are provided on the front side of the first installation rod 107 and on the rear side of the second installation rod 108 so as to be separated from each other in the machine body width direction. The front belt attachment portion 113a extends forward and upward from the front side of the first installation rod 107, and has a shaft portion 113a1 to which the end portion of the fastener 112 is fixed. A hook provided at one end of the fastener 112, for example, is engaged with the shaft portion 113a1. On the other hand, the belt attachment portion 113b on the rear side extends rearward and upward from the rear side of the second setting rod 108, and has a shaft portion 113b1 to which the ring at the other end of the fastener 112 is attached. .

As shown in FIGS. 5C, 6A, 6B, etc., the installation portion 106 has an extension portion 114 . The extending portion 114 faces the lower portion of the fuel cylinder 130 arranged at the installation position K1 in the fuselage outer direction (front-rear direction). Specifically, the extension portion 114 extends rearward and upward from the rear edge portion of the left side connecting wall 110 and the rear edge portion of the right side connecting wall 109 across the rear of the belt attachment portion 113 . . The extension part 114 is a plate-shaped part that is long in the width direction of the fuselage and that is arranged such that the plate surface faces upward in the front direction and downward in the rear direction, and the length in the width direction of the fuselage is longer than the length in the vertical direction and the longitudinal direction. . The extending portion 114 surrounds the fuel cylinder 130 together with the upper member 85 when the support mechanism 90 is at the installation position K1. Specifically, as shown in FIG. 14 , length L2 between upper member 85 and extension portion 114 is smaller than diameter L1 of fuel cylinder 130 . As a result, the fuel cylinder 130 can be kept above the bonnet 40 by surrounding the fuel cylinder 130 with the upper member 85 and the extension portion 114 .

The support mechanism 90 includes a structure that restricts rotation around the first pivot shaft 94 and the second pivot shaft 101 . Specifically, the support mechanism 90 includes a locked portion 120 , a lock mechanism 121 and a plurality of pin mechanisms 127 . As shown in FIGS. 6D, 8A, and 9A, the locked portion 120 is provided on one side (left side) of the accommodating portion 81 in the machine body width direction. Specifically, the locked portion 120 is provided so as to protrude rearward from the rear portion of the middle portion in the vertical direction of the first column portion 83a and the rear wall portion 87a, and is a portion to be locked by the lock mechanism 121 . The left side of the locked portion 120 protrudes rearward from the rear portion of the first column portion 83 a and is bent rightward in the middle. It is connected to the rear part and has a substantially gate shape in plan view.

As shown in FIG. 6D , the locking mechanism 121 is a mechanism capable of locking and unlocking the locked portion 120 . The lock mechanism 121 is provided on one side (left side) of the installation portion 106 in the width direction of the machine body, and has a housing 122, a rotation support plate 123, a rotation lever 124, a locking claw 125, and a handle 126. ing. The housing 122 is formed by bending a thick steel plate, and is a cover body that covers the rotation support plate 123 , the rotation lever 124 and the locking claw 125 .

As shown in FIG. 6D , the rotation support plate 123 rotatably supports the rotation lever 124 and the locking claw 125 . The rotation support plate 123 has a plate surface facing the width direction of the machine body, and is arranged to extend in the vertical direction. is the shape.
As shown in FIG. 6D, the rotating lever 124 is a member that can be rotated. The locking claw 125 is a claw member that is arranged with a plate surface facing the width direction of the machine body, and has a middle portion in the vertical direction that locks with the locked portion 120. The lower portion of the locking claw 125 is elastic, such as a spring. It is connected to the rotating lever 124 by a member 124a. An elastic member 125a such as a spring applies force to the upper portion of the locking claw 125 so as to rotate in the locking direction (counterclockwise when viewed from the left side). 120 and lock. In addition, the locking claw 125 rotates upward by rotating in a direction opposite to the locking direction in which the rotating lever 124 is operated (clockwise when viewed from the left side, releasing direction), and thus the locking portion 120 and the locked portion 120 rotate upward. Unlocking is possible.

As shown in FIG. 6A, the handle 126 is a substantially gate-shaped member provided on the top of the housing 122 . The handle 126 extends upward from the upper portion of the housing 122 and is bent outward in the width direction of the machine body, ie, leftward, at a midpoint. Note that the lock mechanism 121 only needs to restrict the rotation of the fuel cylinder 130 (installation portion 106) around the first pivot shaft 94, and existing technology can be applied.

The plurality of pin mechanisms 127 is a mechanism that restricts rotation about the rotation axis by inserting a pin 127a into a hole, or allows rotation by removing the pin 127a from the hole, and is an index plunger, for example. . The pin mechanism 127 can insert and withdraw the pin 127a by operating a knob 127b on the base end side of the pin 127a. Specifically, in the pin mechanism 127, the pin 127a is protruded by an elastic member such as a built-in spring, and the pin 127a is retracted by pulling the knob 127b. A plurality of pin mechanisms 127 are provided in each of the first lock hole 92b and the second lock hole 104b.

A pin mechanism 127 provided in the first lock hole 92 b inserts or removes a pin 127 a into or from a first locked hole 97 a formed in the upper pivot piece 97 . As a result, the pin mechanism 127 inserts the pin 127a into the first locked hole 97a, thereby restricting the rotation of the fuel cylinder 130 (installation portion 106) around the first pivot shaft 94. As shown in FIG.
On the other hand, the pin mechanism 127 provided in the second lock hole 104b inserts or removes the pin 127a into or from the second locked hole 98b formed in the lower pivot piece 98. As shown in FIG. As a result, the pin mechanism 127 inserts the pin 127a into any one of the plurality of second lockable holes 98b, whereby the second pivot shaft of the fuel cylinder 130 (installation portion 106) is moved. Rotation around 101 is restricted. In other words, the pin 127a of the pin mechanism 127 can be inserted into another second locked hole 98b to switch the fuel cylinder 130 to different positions.

As shown in FIGS. 7A to 9B , the support mechanism 90 rotates the installation portion 106 around the first pivot shaft 94 and around the second pivot shaft 101 to move the fuel cylinder 130 above the bonnet 40 . can be moved to a position different from the installation position K1 of . Specifically, the support mechanism 90 can be switched (moved) to the retracted position K2 and the hanging position K3 separately from the installation position K1. The position of the fuel cylinder 130 when the support mechanism 90 is at the installation position K1, the retracted position K2, and the hanging position K3, and switching among the installation position K1, the retracted position K2, and the hanging position K3 will be described below.

As shown in FIGS. 7A and 7B, when the support mechanism 90 is at the installation position K1, the fuel cylinder 130 (installation portion 106) is arranged above the bonnet 40 (rear bonnet 42). Housed in 81. Therefore, by arranging the fuel cylinder 130 above the bonnet 40, the space above the bonnet 40 can be effectively utilized. Further, as shown in FIG. 15, the support mechanism 90 can support the fuel cylinder 130 inside the turning locus C2 of the swivel base 2 at the installation position K1. The trajectory C1 is inside the turning trajectory C2 of the swivel base 2 . Therefore, when the swivel base 2 is swiveling, the fuel cylinder 130 is within the swivel locus of the swivel base 2, so that the fuel cylinder 130 can be prevented from coming into contact with surrounding obstacles. Further, when the support mechanism 90 is at the installation position K1, the front of the fuel cylinder 130 is covered with the vertical member 84 and the upper side of the fuel cylinder 130 is covered with the upper member 85 . As shown in FIG. 7B, the fuel cylinder 130 is positioned in the movement range S when the bonnet 40 is opened and closed. restrict movement. The support mechanism 90 can be switched from the installation position K1 to the retracted position K2. Furthermore, as shown in FIG. 14, a fuel cylinder 130 is positioned above the rear end of the crawler belt 16 in the front-rear direction.

As shown in FIG. 8B, the retracted position K2 is a position that does not interfere with the bonnet 40 (rear bonnet 42) when the bonnet 40 (rear bonnet 42) is opened and closed. Specifically, the retracted position K2 is a position at which the fuel cylinder 130 is horizontally retracted from the movement range S when the bonnet 40 is opened and closed, and the fuel cylinder 130 is retracted to the other side (right side) in the machine width direction. That is, the support mechanism 90 retracts the fuel cylinder 130 at the installation position K1 to the retraction position K2 set on the same side as the fuel filler port 50b of the fuel tank 50 from the installation position K1. In such a case, the fuel cylinder 130 is tilted to the rear right in plan view and supported. Therefore, both the effective use of the space above the hood 40 and the convenience of opening and closing the hood 40 can be achieved. Further, since the support mechanism 90 retracts the fuel cylinder 130 at the installation position K1 to the retraction position K2 set on the same side as the fuel tank 50 on which the filler port 50b is arranged from the installation position K1, the fuel cylinder 130 replacement work and refueling work to the fuel tank 50 can be performed continuously, and depending on the replacement work and the refueling work, the swivel base 2 or the revolving work machine 1 itself can be swiveled, or the operator can perform the refilling work. There is no need to transport the fuel cylinder 130 or the plastic tank containing the fuel, and the working efficiency can be improved. The support mechanism 90 rotates the installation portion 106 (first pivot bracket 95 ) around the first pivot shaft 94 to switch from the installation position K<b>1 to the retracted position K<b>2 . The switching operation of the support mechanism 90 from the installation position K1 to the retracted position K2 will be described below.

When the operator pulls the rotating lever 124 , the locking claw 125 releases the locking with the locked portion 120 . When the operator holds the handle 126 and pulls the handle 126 backward around the first pivot shaft 94 in a state in which the locking between the locking claw 125 and the locked portion 120 is released, FIG. As shown in 8B, the first pivot bracket 95 pivots about the first pivot shaft 94 . In the first pivot bracket 95, the lower end of the lower pivot piece 98 and the upper surface of the lower pivot portion 93 slide, and the fuel cylinder 130 (installation portion 106) rotates in the horizontal direction (backward).

When the first pivot bracket 95 rotates around the first pivot shaft 94 , the pin mechanism 127 inserts the pin 127 a into the first locked hole 97 a , and the pin mechanism 127 moves the first pivot bracket 95 . Rotation around the pivot shaft 94 is restricted. When the pin mechanism 127 restricts the rotation of the first pivot bracket 95 around the first pivot shaft 94, the installation portion 106 rotates downward around the second pivot shaft 101, and the second pivot bracket 102 ( The lower end of the second connecting plate 104) is engaged with the notch 93b of the lower pivotal support portion 93. As shown in FIG. Specifically, the lower end of the second connecting plate 104 engages with the first end surface 93b1. As a result, when the fuel cylinder 130 is lowered from or installed on the installation portion 106 , the installation portion 106 can be prevented from rotating and causing the fuel cylinder 130 to be displaced from the installation portion 106 .

When the lower end of the second connecting plate 104 engages with the notch 93b of the lower pivot portion 93, the pin mechanism 127 inserts the pin 127a into the second locked hole 98b along with the engagement, and the pin mechanism 127 and the notch 93b , restricts the rotation of the installation portion 106 around the second pivot shaft 101 . As a result, the pin mechanism 127 and the notch 93b restrict rotation of the first pivot bracket 95 around the first pivot shaft 94, and the pin mechanism 127 allows the installation portion 106 to rotate around the second pivot shaft 101. is regulated, and the support mechanism 90 is switched to the retracted position K2.

As shown in FIG. 8B, when the support mechanism 90 is at the retracted position K2, the space (the space above the rear bonnet 42) when the support mechanism 90 is at the installed position K1 is opened. That is, a region longer than the length L3 of the rear bonnet 42 in the machine width direction is opened, and when the support mechanism 90 is set to the retracted position K2, part of the rear bonnet 42 may enter this region. Therefore, the rear bonnet 42 can be opened wide.

The switching operation from the retracted position K2 to the installation position K1 is performed in reverse order to the above-described procedure. That is, the operator pulls the knob 127b of the pin mechanism 127 to remove the pin 127a from the second locked hole 98b, thereby releasing the restriction on the rotation of the installation portion 106 around the second pivot shaft 101. Then, holding the handle 126, the installation portion 106 is rotated upward. By rotating the installation portion 106 upward, the lock between the second connecting plate 104 and the notch 93b is released. With the second connecting plate 104 and the notch 93b unlocked, the operator pulls the knob 127b of the pin mechanism 127 to remove the pin 127a from the first locked hole 97a, thereby removing the first pivot. When the restriction on rotation of the support bracket 95 around the first pivot shaft 94 is released, the operator rotates the installation portion 106 around the first pivot shaft 94 in the horizontal direction (forward). When the operator rotates the installation portion 106 forward about the first pivot shaft 94, the locking claw 125 is locked with the locked portion 120, and the support mechanism 90 is switched to the installation position K1.

Further, the support mechanism 90 can be switched from the retracted position K2 to the hanging position K3. As shown in FIGS. 9A and 9B, the hanging position K3 is a position where the fuel cylinder 130 (installation portion 106) is arranged below the retracted position K2 and the installation portion 106 is suspended. The installation portion 106 can be suspended below the bonnet 40 rather than above it. When the support mechanism 90 is at the hanging position K3, the fuel cylinder 130 installed on the installation portion 106 is inclined from the front upper part to the rear lower part. In other words, the fuel cylinder 130 has its lower portion located outside its upper portion. As a result, the installation portion 106 with the fuel cylinder 130 installed therein is arranged below the bonnet 40 , so that the operator can easily unload the fuel cylinder 130 from the installation portion 106 . Also, the operator can easily install another fuel cylinder 130 filled with the second fuel in the installation section 106 . Furthermore, when the support mechanism 90 is switched to the hanging position K3, the tilted fuel cylinder 130 can be lifted from the installation portion 106, and the fuel cylinder 130 can be easily lowered.
The support mechanism 90 is switched from the retracted position K2 to the hanging position K3 by rotating the fuel cylinder 130 downward about the second pivot shaft 101 from the retracted position K2. The switching operation of the support mechanism 90 from the retracted position K2 to the hanging position K3 will be described below.

When the operator pulls the knob 127b of the pin mechanism 127, the pin 127a is removed from the second locked hole 98b, and the restriction on the rotation of the installation portion 106 around the second pivot shaft 101 is released. With the pin 127a removed from the second locked hole 98b, the operator grasps the handle 126 to move the installation portion 106 downward, and rotates the installation portion 106 downward around the second pivot shaft 101. move. When the installation portion 106 is rotated around the second pivot shaft 101, the gas damper 115 is contracted, and the second pivot bracket 102 (installation portion 106) is relatively gently rotated around the second pivot shaft 101. do. When the installation portion 106 rotates downward around the second pivot shaft 101, the lower end of the second connecting plate 104 and the second end face 93b2 of the notch 93b are locked, and the pin 127a of the pin mechanism 127 is moved to the second position. By inserting it into the locked hole 98b, the rotation of the installation portion 106 around the second pivot shaft 101 is restricted, and the support mechanism 90 is switched to the hanging position K3.

Note that switching from the hanging position K3 to the retracted position K2 is performed in the reverse order of the above-described procedure. That is, the operator pulls the knob 127b of the pin mechanism 127 to remove the pin 127a from the second locked hole 98b, thereby releasing the restriction on the rotation of the installation portion 106 around the second pivot shaft 101. In addition, the handle 126 is gripped and the installation portion 106 is rotated upward around the second pivot shaft 101 . When the installation portion 106 is rotated upward, the gas damper 115 extends, and the installation portion 106 rotates upward about the second pivot shaft 101 relatively slowly. When the installation portion 106 rotates upward around the second pivot shaft 101, the pin 127a of the pin mechanism 127 is inserted into the second locked hole 98b, thereby rotating the installation portion 106 around the second pivot shaft 101. Movement is restricted, and the support mechanism 90 is switched to the retracted position K2.

The prime mover 4 is a bi-fuel engine (multi-fuel engine) driven by selectively using either the first fuel or the second fuel. and the second fuel. For this reason, in general, in environments with relatively low temperatures, such as in winter or in extremely cold regions, the secondary fuel such as liquefied petroleum gas has lower startability than the primary fuel such as gasoline. Startability can be ensured by starting the prime mover 4 using gasoline. Also, the fuel can be selected according to the remaining amount of the fuel tank 50 and the remaining amount of the fuel cylinder 130 .

As shown in FIG. 10, the prime mover 4 included in the swing work machine 1 includes a first fuel injector 4a for injecting a first fuel into a cylinder (not shown) of the prime mover 4 and a second fuel injector 4a for injecting a second fuel into the cylinder. and a fuel injector 4b. The swing work machine 1 also includes a fuel pump 131 and a control valve 132a. The first fuel injector 4 a is connected to the fuel tank 50 via the fuel pump 131 .

As shown in FIG. 10, the fuel pump 131 connects the first fuel injector 4a and the fuel tank 50, and supplies the first fuel in the fuel tank 50 to the first fuel injector 4a. For example, the fuel pump 131 has a driving part such as an electric motor, and when driven, supplies the first fuel contained in the fuel tank 50 to the first fuel injector 4a.

As shown in FIG. 10, the control valve 132a connects the second fuel injector 4b and the fuel cylinder 130, and supplies the second fuel in the fuel cylinder 130 to the second fuel injector 4b. The control valve 132a can change the degree of opening, and can adjust the second fuel supplied from the fuel cylinder 130 to the second fuel injector 4b. In addition, when the second fuel contained in the fuel cylinder 130 is liquefied by being compressed, that is, when natural gas is compressed and stored as liquefied natural gas in the fuel cylinder 130, or when petroleum gas is compressed. When the liquefied petroleum gas is stored in the fuel cylinder 130 as a liquefied petroleum gas, the swing work machine 1 includes a vaporizer for phase-transitioning the liquefied second fuel to gas. A vaporizer is provided between the control valve 132a and the second fuel injector 4b. The vaporizer vaporizes the liquefied second fuel under reduced pressure, thereby supplying the vaporized second fuel to the second fuel injector 4b.

The swing work machine 1 may also include a spare cylinder 132b that supplies fuel to the prime mover 4 when the remaining amount of fuel in the fuel cylinder 130 drops below a predetermined amount. The spare cylinder 132b is, for example, a reserve tank that stores the second fuel between the fuel cylinder 130 and the control valve 132a. The spare cylinder 132b stores therein the second fuel supplied from the fuel cylinder 130, and supplies the stored second fuel to the control valve 132a. That is, when the second fuel in the fuel cylinder 130 becomes empty, the swing work machine 1 continues to drive using the second fuel in the spare cylinder 132b. When the rotating work machine 1 is provided with a spare cylinder 132b, the spare cylinder 132b is housed in the housing portion 81 and attached to the rear surface of the vertical member 84, for example. As a result, even when the remaining amount of fuel in the fuel cylinder 130 is low, the swing work machine 1 can continue the work without immediately stopping the work.

As shown in FIG. 10 , the swing work machine 1 includes a fuel switching section 133 . The fuel switching unit 133 is composed of, for example, a CPU, an electronic circuit, and the like, and performs switching control between the first fuel and the second fuel to be supplied to the motor 4 . In this embodiment, the fuel switching unit 133 switches the fuel supplied to the prime mover 4 between the first fuel and the second fuel by electrical/electronic control. The fuel switching unit 133 may switch the fuel supplied to the prime mover 4 mechanically, and is not limited to the above configuration.

Fuel switching unit 133 has storage unit 134 , first fuel control unit 135 , and second fuel control unit 136 . The storage unit 134 is a non-volatile memory or the like, and stores various information. The storage unit 134 stores, for example, various application software.
The first fuel control unit 135 is composed of a CPU and the like, and performs various controls related to the supply of the first fuel to the prime mover 4 . The first fuel control unit 135 is connected to the first fuel injector 4a and the fuel pump 131, and based on the operation of the operation device 71 and the information stored in the storage unit 134, controls the first fuel injector 4a and the fuel. A pump 131 can be controlled.

The second fuel control unit 136 is composed of a CPU and the like, and performs various controls related to the supply of the second fuel to the prime mover 4 . The second fuel control unit 136 is connected to the second fuel injector 4b and the control valve 132a, and controls the second fuel injector 4b and the control valve 132a based on the operation of the operation device 71 and the information stored in the storage unit 134. Valve 132a is controllable.
As shown in FIG. 10, the operating device 71 includes an operating tool 141. As shown in FIG. In other words, the swing work machine 1 includes an operation tool 141. The operation tool 141 is a changeover switch for switching the fuel supplied to the prime mover 4. For example, the operation tool 141 is operated between a first position and a second position. It is possible. An operation signal from operation tool 141 is input to fuel switching unit 133 , and fuel switching unit 133 performs switching control to supply either the first fuel or the second fuel to prime mover 4 based on the operation signal. Specifically, when the operation tool 141 is at the first position, the first fuel control unit 135 of the fuel switching unit 133 controls the first fuel injector 4a and the fuel pump 131 to supply the first fuel to the prime mover 4. . On the other hand, when the operation tool 141 is at the second position, the second fuel control section 136 of the fuel switching section 133 controls the second fuel injector 4b and the control valve 132a to supply the prime mover 4 with the second fuel. As a result, when the remaining amount of one of the fuel tank 50 and the fuel cylinder 130 becomes low, the other fuel can be used to drive the prime mover 4 and the work can be continued. Further, the operator can easily switch the fuel for driving the prime mover 4 according to the work situation, environment, and the like.

As shown in FIG. 10, the turning work machine 1 includes an information acquisition unit 142 that acquires information about the turning work machine 1, and a plurality of indicators 143 that display the information acquired by the information acquisition unit 142. there is The information acquisition unit 142 uses various signals (detection signals, switch signals, command signals, etc.) to detect failures or abnormalities of electrical components, failures or abnormalities of the work device 20, remaining amounts of the fuel tank 50 and the fuel cylinder 130, and the like. to detect information about The information acquisition unit 142 includes an intake air temperature sensor 142a that detects the intake air temperature, a failure diagnosis unit 142b that diagnoses failures and abnormalities in electrical components, and a first residual amount that detects the remaining amount of the first fuel contained in the fuel tank 50. A quantity sensor 142c and a second remaining quantity sensor 142d for detecting the remaining quantity of the second fuel contained in the fuel cylinder 130 are included.

The intake air temperature sensor 142a is a thermistor attached to the intake manifold of the motor 4, for example. The failure diagnosis unit 142b diagnoses failures and abnormalities of the electrical components based on the operating conditions of the electrical components and the work device 20, for example.
The first remaining amount sensor 142c is, for example, a potentiometer that detects the amount of vertical movement of a float provided inside the fuel tank 50 .

The second remaining amount sensor 142d is, for example, a pressure sensor that detects the pressure of the second fuel supplied from the fuel cylinder 130, and is provided between the fuel cylinder 130 and the control valve 132a. When the swing work machine 1 is provided with the spare cylinder 132b, the second remaining amount sensor 142d may be provided between the fuel cylinder 130 and the control valve 132a, or may be provided in the spare cylinder 132b. The pressure of the second fuel in the reserve cylinder 132b may be detected, or both may be provided. When the second remaining amount sensor 142d is provided between the fuel cylinder 130 and the control valve 132a, the second remaining amount sensor 142d detects the pressure of the second fuel supplied from the fuel cylinder 130, that is, the pressure of the fuel cylinder 130 to detect the remaining amount of the second fuel inside. On the other hand, when the second remaining amount sensor 142d is provided in the spare cylinder 132b, the second remaining amount sensor 142d detects the pressure of the second fuel supplied from the spare cylinder 132b, that is, the second fuel inside the spare cylinder 132b. Detects the remaining amount of fuel.

The information acquisition unit 142 outputs information such as the remaining amount of fuel, the failure or abnormality of the electrical component, the failure or abnormality of the working device 20, etc. to the fuel switching unit 133 as a signal.
As shown in FIG. 10, the plurality of indicators 143 are connected to the fuel switching section 133, change the display form based on the signal output from the fuel switching section 133, and inform the operator. The plurality of indicators 143 are, for example, lamps whose display modes can be changed by switching on and off. In the present embodiment, the plurality of indicators 143 are lamps, but may be a display device (monitor) that changes a display image based on an input signal, and the display method is not limited to the above configuration. .

The multiple indicators 143 include an intake air temperature indicator 143a, a failure indicator 143b, a first indicator 143c, a second indicator 143d, and a third indicator (display mechanism) 143e. The intake air temperature indicator 143a lights when the intake air temperature is equal to or higher than a predetermined value, and turns off when the intake air temperature is lower than the predetermined value.

The failure indicator 143b is an indicator 143 that indicates a failure or abnormality of an electrical component or a failure or abnormality of the working device 20. It is turned on when a diagnosis is made, and is turned off when the failure diagnosis unit 142b diagnoses that there is no failure or abnormality in the electrical component or the work device 20.
The first indicator 143c is the indicator 143 that indicates the remaining amount of the first fuel, and lights up when the remaining amount of the first fuel is less than a predetermined value, and the remaining amount of the first fuel is equal to or greater than the predetermined value. turn off when

The second indicator 143d is the indicator 143 that indicates the remaining amount of the second fuel, and lights up when the remaining amount of the second fuel is less than a predetermined value, and the remaining amount of the second fuel is equal to or greater than the predetermined value. turn off when That is, when the second remaining amount sensor 142d is provided between the fuel cylinder 130 and the control valve 132a, the second indicator 143d displays the remaining amount of the second fuel inside the fuel cylinder 130. FIG.

Further, when the swing work machine 1 is equipped with the spare cylinder 132b and the second remaining amount sensor 142d is provided between the fuel cylinder 130 and the control valve 132a, the second indicator 143d indicates the fuel cylinder inside the fuel cylinder 130. Displays the remaining amount of the second fuel. Therefore, when the second indicator 143d is on, it can be recognized that the swing work machine 1 is being driven by the second fuel in the spare cylinder 132b.

Further, when the swing work machine 1 is provided with the spare cylinder 132b and the second remaining amount sensor 142d is provided between the spare cylinder 132b and the control valve 132a, the second indicator 143d indicates the inside of the spare cylinder 132b. Displays the remaining amount of the second fuel. Therefore, when the second indicator 143d is lit, it is recognized that the swing work machine 1 is driven by the second fuel in the spare cylinder 132b and/or the remaining amount of the second fuel in the spare cylinder 132b. can do.

The third indicator 143e is an indicator 143 that indicates whether the fuel being supplied to the prime mover 4 is the first fuel or the second fuel, and turns off when the first fuel is supplied to the prime mover 4. Lights up when the second fuel is supplied to the prime mover 4 . In other words, the third indicator 143e is turned off when the operating tool 141 is at the first position, and is turned on when at the second position.

As shown in FIG. 11, the operating tool 141 and the plurality of indicators 143 are provided on the swivel base 2 in the same direction as the position of the fuel filler port 50b with respect to the swivel center of the swivel base 2. It is arranged behind the armrest 75 . As a result, the operator can operate the operation tool 141 immediately after confirming the fuel tank 50 and supplying the first fuel to the fuel tank 50 . Therefore, the convenience of operating the operating tool 141 can be improved. In addition, the operator can continuously perform the replacement work of the fuel cylinder 130 and the work of refueling the fuel tank 50 while checking the first indicator 143c and the second indicator 143d. , the completion of replacement work and lubrication work can be easily recognized.

Specifically, the operation tool 141 and the plurality of indicators 143 extend rearward from the upper rear portion of the console box 70 and are provided in the operation portion 140 behind the armrest 75 . Therefore, when the operator sitting on the driver's seat 8 faces to the right, the operator can operate the operating tool 141, and the operating tool 141 is at a position where the operator sitting on the driver's seat 8 can operate. are placed in On the other hand, when the worker sitting in the driver's seat 8 is working with his elbows resting on the armrest 75, the operating tool 141 is at a different height from the worker's arm and does not come into contact with or interfere with the worker's arm. Erroneous operation of the operation tool 141 can be suppressed. Therefore, it is possible to prevent the operator from unintentionally switching the fuel for driving the prime mover 4 .

The intake air temperature indicator 143a and the failure indicator 143b are provided on one side (left side) of the operation unit 140 in the machine body width direction, and the intake air temperature indicator 143a and the failure indicator 143b are arranged in this order from the front side. Further, the operation tool 141, the first indicator 143c, the second indicator 143d, and the third indicator 143e are provided on the other side (right side) of the operation section 140 in the body width direction. Further, the operating tool 141, the first indicator 143c, the second indicator 143d, and the third indicator 143e are arranged from the front in the order of the operating tool 141, the third indicator 143e, the second indicator 143d, and the first indicator 143c. .

The exhaust structure 54 of the swing work machine 1 will be described in detail below. As shown in FIG. 12A, the exhaust structure 54 is arranged in the engine room E inside the bonnet 40, is connected to the exhaust manifold of the prime mover 4, and allows the exhaust gas discharged from the exhaust manifold to pass through and be discharged to the outside. do. The exhaust structure 54 of the swing work machine 1 includes a plurality of mufflers, and the exhaust gas discharged from the prime mover 4 is passed through the plurality of mufflers, thereby reducing the temperature and noise of the exhaust gas and removing harmful substances. Discharge to the outside. Specifically, the exhaust structure 54 of the turning work machine 1 includes a discharge pipe 150, a first muffler 151, a first exhaust pipe (exhaust pipe) 151c, a second muffler 152, a second receiving portion 153b, It has a second exhaust pipe 153 a , a third muffler 153 and a tail pipe 154 .

As shown in FIG. 12A , the exhaust pipe 150 is a tubular member with a hollow interior, is connected to the exhaust manifold of the prime mover 4 , and allows the exhaust gas discharged by the prime mover 4 to pass therethrough. In this embodiment, the exhaust pipe 150 extends upward from the exhaust manifold, bends in the middle, and extends forward.
As shown in FIGS. 12A, 12C, and 12E, the first muffler 151 is connected between the prime mover 4 and the first exhaust pipe 151c. One end side (rear side) is connected to the other end side (front side) of the discharge pipe 150 and extends toward the other end side. The first muffler 151 has an exhaust path 151a and a first muffler body 151b. The exhaust path 151a is a hollow cylindrical portion extending from the other end toward the one end. One end of the exhaust passage 151a communicates with the inside of the exhaust pipe 150, that is, it is connected to the motor 4 via the exhaust pipe 150, and allows the exhaust gas discharged by the motor 4 to pass through toward the other end. As shown in FIG. 12E, a plurality of communication holes 151a1 are formed in the outer periphery of the exhaust path 151a on one end side to communicate the inside and the outside of the exhaust path 151a. A flange protruding radially outward is formed on the outer circumference of the other end of the exhaust passage 151a. In the present embodiment, the exhaust passage 151a is connected to the motor 4 via the exhaust pipe 150, but the exhaust passage 151a is connected to the motor 4 and directs the exhaust gas discharged by the motor 4 toward the other end. It may be directly connected to the exhaust manifold of the prime mover 4, or may be connected to the exhaust manifold via a member different from the exhaust pipe 150.

As shown in FIG. 12E, the first muffler body 151b covers the outside of the exhaust passage 151a and forms a double pipe with the exhaust passage 151a. That is, the first muffler 151 forms a double pipe structure. The first muffler body 151b is arranged to cover the plurality of communication holes 151a1 formed in the exhaust passage 151a. A sound-absorbing material such as glass wool may be filled between the first muffler body 151b and the exhaust path 151a. Not limited. Also, the first muffler 151 may be formed integrally with a three-way catalytic converter (three-way catalytic device). That is, the first muffler 151 may have a three-way catalyst function and a muffler function.

The first exhaust pipe (exhaust pipe) 151c allows the exhaust gas from the prime mover 4 to pass therethrough. Specifically, as shown in FIGS. 12A, 12C, and 12E, one end side (rear side) of the first exhaust pipe 151c is connected to the other end side (front side) of the first muffler 151 (exhaust passage 151a). and extends toward the other end. A flange protruding radially outward is formed on the outer circumference of one end of the first exhaust pipe 151c, and is fastened to the flange of the exhaust path 151a by fastening members such as bolts. In this embodiment, the first exhaust pipe 151c is connected to the exhaust path 151a. It may be connected, or may be connected to the exhaust manifold via a member different from the exhaust pipe 150 .

As shown in FIGS. 12A, 12C, and 12E, one end side (rear side) of the second muffler 152 is connected to the other end side (front side) of the first exhaust pipe 151c. It is arranged on the other end side. The second muffler 152 has a first receiving portion 152a, a second muffler body (muffler body portion) 152b, and a discharge pipe (discharge portion) 152c. The first receiving portion 152a receives the exhaust gas discharged from the first exhaust pipe 151c. The first receiving portion 152a is provided on one end side (rear side) of the muffler body portion 152b and communicates with the inside of the muffler body portion 152b. The first receiving portion 152a has an expanded pipe structure in which the diameter increases from the muffler body portion 152b toward the upstream side of the exhaust gas flowing through the first exhaust pipe 151c. In other words, the first receiving portion 152a is a tapered portion whose inner diameter is larger on the upstream side (one end side) than on the downstream side (the other end side). The inner diameter of the upstream side of the first receiving portion 152a is at least larger than the outer diameter of the other end side of the first exhaust pipe 151c.

As shown in FIG. 12E, the first receiving portion 152a forms a double pipe structure by inserting the end portion of the first exhaust pipe 151c. Specifically, the other end of the first exhaust pipe 151c is inserted upstream of the first receiving portion 152a. The first receiving portion 152a overlaps with the first exhaust pipe 151c in the exhaust direction. Specifically, one end side (rear side) of the first receiving portion 152a overlaps with the other end side (front side) of the first exhaust pipe 151c.

Further, as shown in FIG. 12E, the first receiving portion 152a introduces the exhaust gas discharged from the first exhaust pipe 151c and the outside air into the muffler body portion 152b. Specifically, between the first receiving portion 152a and the first exhaust pipe 151c, a first introduction passage 152b1 for introducing outside air into the discharge pipe 152c is formed. The first introduction path 152b1 is a gap formed between the inner surface of the first receiving portion 152a and the outer surface of the first exhaust pipe 151c, and exhaust gas passing from the first exhaust pipe 151c toward the first receiving portion 152a. As a result, the air outside the first receiving portion 152a passes through the first introduction path 152b1 and is introduced into the first receiving portion 152a. As a result, exhaust temperature and noise can be efficiently reduced with a simple configuration.

The muffler body portion 152b allows the exhaust gas received from the first receiving portion 152a to pass therethrough. Specifically, as shown in FIG. 12E, the muffler main body portion 152b has a hollow cylindrical shape extending from one end side (rear side) toward the other end side (front side). 152c. That is, the muffler main body portion 152b allows the exhaust gas received from the first receiving portion 152a to pass through the discharge pipe 152c. The muffler body portion 152b covers the outside of the other end of the first receiving portion 152a, and forms a double pipe with the other end of the first receiving portion 152a. The muffler body 152b covers the other end of the discharge pipe 152c and forms a double pipe together with the other end of the discharge pipe 152c.

The discharge pipe 152c discharges the exhaust gas from the muffler main body 152b. The discharge pipe 152c is a hollow portion, and as shown in FIG. 12E, extends from one end to the other end. They are arranged on the direction side, protrude in substantially parallel directions from the muffler main body 152b, and are arranged at positions facing each other. That is, the exhaust gas received from the first receiving portion 152a passes through the inside of the muffler main body portion 152b, passes through a substantially U-shaped path in plan view, and is discharged from the discharge pipe 152c. Therefore, the exhaust gas received from the first receiving portion 152a is discharged from the discharge pipe 152c in the direction opposite to the exhaust direction received by the first receiving portion 152a. As a result, the exhaust structure 54 can be made compact, and the exhaust structure 54 can be arranged in a narrower space. The interior of the second muffler 152 may be filled with a noise-reducing material such as glass wool, and the structure of the second muffler 152 is not limited to the above structure, as conventional techniques can be applied.

In the present embodiment, the first receiving portion 152a introduces the exhaust gas discharged from the first exhaust pipe 151c and the outside air into the muffler body portion 152b. 151c and the second muffler 152 (muffler main body 152b or first receiving portion 152a) are connected by welding or flange connection, and only the exhaust gas discharged from the first muffler 151 without introducing outside air is passed through the second muffler. 152.

As shown in FIG. 12E, the second receiving portion 153b receives the exhaust gas discharged from the discharge pipe 152c. The second receiving portion 153b is connected to a second exhaust pipe 153a, which will be described later, and has an expanded pipe structure in which the diameter increases toward the second exhaust pipe 153a side (muffler body portion 152b side). In other words, the second receiving portion 153b is a tapered portion whose inner diameter is larger on the upstream side (the other end side) than on the downstream side (the one end side). The upstream inner diameter of the second receiving portion 153b is at least larger than the outer diameter of one end of the discharge pipe 152c.

As shown in FIG. 12E, the second receiving portion 153b forms a double pipe structure by inserting the end portion of the discharge pipe 152c therein. Specifically, one end of the discharge pipe 152c is inserted upstream of the second receiving portion 153b. The second receiving portion 153b overlaps with the discharge pipe 152c in the exhaust direction. Specifically, the other end side (front side) of the second receiving portion 153b overlaps with the one end side (rear side) of the discharge pipe 152c.

Further, as shown in FIG. 12E, the second receiving portion 153b introduces the exhaust gas discharged from the discharge pipe 152c and the outside air into the second exhaust pipe 153a. Specifically, a second introduction passage 153b1 for introducing outside air into the second exhaust pipe 153a is formed between the second receiving portion 153b and the discharge pipe 152c. The second introduction path 153b1 is a gap formed between the inner surface of the second receiving portion 153b and the outer surface of the discharge pipe 152c. Air outside the receiving portion 153b passes through the second introduction path 153b1 and is introduced into the second receiving portion 153b. As a result, exhaust temperature and noise can be efficiently reduced with a simple configuration.

The second exhaust pipe 153a allows the exhaust gas received from the second receiving portion 153b to pass therethrough. The second exhaust pipe 153a extends from one end toward the other end. The second exhaust pipe 153a is a cylindrical portion with a hollow interior, and allows the exhaust gas that has passed through the discharge pipe 152c to pass therethrough. A plurality of communication holes 153a1 are formed in the outer circumference of the second exhaust pipe 153a to communicate the inside and the outside of the second exhaust pipe 153a.

As shown in FIGS. 12A, 12C, and 12E, the third muffler 153 has the other end side (front side) connected to the second exhaust pipe 153a, the outer side of the first muffler 151 in the machine width direction, and the third muffler. 2 It is arranged on one end side of the muffler 152 . That is, the first muffler 151 and the third muffler 153 are arranged to face each other. As shown in FIG. 12E, the third muffler 153 has a third muffler body 153c.

As shown in FIG. 12E, a second exhaust pipe 153a is inserted inside the third muffler body 153c, and the inside of the third muffler body 153c and the second exhaust pipe 153a communicate with each other. In other words, the third muffler body 153c covers the outside of the second exhaust pipe 153a and forms a double pipe together with the second exhaust pipe 153a. That is, the third muffler 153 forms a double pipe structure. The third muffler body 153c is arranged to cover a plurality of communication holes 153a1 formed in the second exhaust pipe 153a.

In this embodiment, the third muffler 153 has the second exhaust pipe 153a inserted inside the third muffler body 153c. It is often arranged inside the third muffler body 153c separately from the second exhaust pipe 153a, communicates the inside of the third muffler body 153c and the second exhaust pipe 153a, and discharges from the second exhaust pipe 153a. It may also have a pipe member for flowing exhaust gas. Further, a sound deadening material such as glass wool may be filled between the third muffler body 153c and the second exhaust pipe 153a. Not limited to configuration.

As shown in FIGS. 12A, 12B, 12C, etc., the tail pipe 154 discharges exhaust gas discharged from the third muffler 153 . The tail pipe 154 is a tubular material with a hollow interior, and extends from the other end side toward the one end side. The other end side of the tail pipe 154 is connected to one end side of the third muffler 153, and the inside of the tail pipe 154 communicates with the second exhaust pipe 153a. Therefore, as shown in FIG. 12E, at least part of the exhaust gas path from the engine 4 to the first receiving portion 152a via the first muffler 151, and from the discharge portion 152c to the tail pipe 154 via the third muffler 153. At least a part of the exhaust gas path leading to the exhaust gas is arranged at a position facing each other. As shown in FIGS. 1A, 1B, 12A, etc., one end side of the tail pipe 154 extends rearward from the rear portion of the weight 38 .

The positional relationship between the first receiving portion 152a and the second receiving portion 153b will be described below. As shown in FIGS. 12C and 12E, the first receiving portion 152a and the second receiving portion 153b are arranged adjacent to each other in a direction perpendicular to the direction in which the first muffler 151 and the third muffler 153 extend, that is, in the machine width direction. ing. More specifically, the opening direction of the first receiving portion 152a, that is, the direction in which the inner diameter increases, and the opening direction of the second receiving portion 153b face each other. and the other end of the second receiving portion 153b are separated from each other in the longitudinal direction, and the right end of the first receiving portion 152a and the left end of the second receiving portion 153b are separated from each other in the machine width direction. estranged from By arranging the first receiving portion 152a and the second receiving portion 153b adjacent to each other, the first introduction path 152b1 and the second introduction path 153b1 are brought closer. Therefore, the space for introducing outside air can be made compact.

The attachment of the first muffler 151, the second muffler 152, and the third muffler 153 will be described in detail below. As shown in FIGS. 12A, 12B, and 12D, the exhaust structure 54 of the swing work machine 1 includes a first fixing bracket 155. As shown in FIGS. The first fixing bracket 155 fixes the first muffler 151 , the second muffler 152 and the third muffler 153 to the prime mover 4 . Thereby, the relative positions of the first muffler 151, the second muffler 152, and the third muffler 153 can be fixed. Therefore, it is possible to prevent the first muffler 151, the second muffler 152, and the third muffler 153 from coming into contact with each other.

As shown in FIGS. 12B and 12D, the first fixed bracket 155 has a muffler attachment portion 156, an extension portion 157, a fastening portion 158, and an upper cover 159. As shown in FIGS. The muffler mounting portion 156, the extension portion 157, the fastening portion 158, and the upper cover 159 are formed by bending a thick steel plate, for example. The muffler mounting portion 156 includes an upper plate 156a, side plates 156b, a rear plate 156c, and a front plate 156d. The upper plate 156 a is a plate-shaped portion that is arranged with its plate surface facing in the vertical direction, has longer lengths in the body width direction and the front-rear direction than the lengths in the vertical direction, and constitutes the upper portion of the muffler mounting portion 156 .

As shown in FIGS. 12B and 12D, the first muffler 151 and the third muffler 153 are attached to the upper surface of the upper plate 156a with fasteners such as bolts. Specifically, the first muffler 151 is attached to one side (left side) of the top plate 156a, and the second muffler 152 is attached to the other side (right side) of the top plate 156a.
As shown in FIG. 12B , the side plate 156b is a portion that extends downward from the inner (left) end of the upper plate 156a in the body width direction, and is the outer side (right) of the motor 4 in the body width direction. That is, it is fixed to the flywheel 4c by fasteners such as bolts.

As shown in FIG. 12B, the rear plate 156c is a portion extending downward from the rear end of the upper plate 156a, and is a rib connecting the upper plate 156a and the side plate 156b. The front plate 156d is a portion extending downward from the front end of the upper plate 156a, and is a rib connecting the upper plate 156a and the side plate 156b.
As shown in FIGS. 12B and 12D, the extension part 157 is a part provided on the other end side (front side) of the muffler attachment part 156, and the third muffler 153 is attached to the front upper part by a fastener such as a bolt. be done. The extension part 157 is a substantially inverted L-shaped member when viewed from the left side, and one end side (rear side) thereof is fastened to the front plate 156d with fasteners such as bolts.

As shown in FIGS. 12C and 12D , the fastening portion 158 is a portion that fastens the first muffler 151 to the muffler attachment portion 156 by sandwiching the first muffler 151 together with the muffler attachment portion 156 . The fastening portion 158 includes a first attached portion 158a, a second attached portion 158b, and a curved portion 158c. The first attached portion 158a and the second attached portion 158b are portions that are fastened to the upper portion of the muffler attachment portion 156 with fasteners such as bolts. One side (left side) in the machine width direction of the curved portion 158c is connected to the first attached portion 158a, and the other side (right side) in the machine width direction is connected to the second attached portion 158b. It is convexly curved upwards. That is, the curved portion 158c fits the upper portion of the first muffler 151 into the concave surface (lower surface) of the curved portion 158c, and the concave portion 84a and the upper portion of the muffler mounting portion 156 sandwich the first muffler 151 therebetween.

As shown in FIGS. 12B and 12D , the upper cover 159 is a member that covers the upper portion of the first muffler 151 . The upper cover 159 is attached to the muffler attachment portion 156 with fasteners such as bolts.
The first fixing bracket 155 described above fixes the first muffler 151, the second muffler 152, and the third muffler 153 to the motor 4, but the first muffler 151, the second muffler 152, and the third muffler 153 are It may be configured to be fixed to separate structures. For example, as shown in FIGS. 13A and 13B , the exhaust structure 54 of the swing work machine 1 includes a second fixed bracket 160 and a third fixed bracket 164 . The second fixing bracket 160 fixes the first muffler 151 and the third muffler 153 to the prime mover 4 , and the third fixing bracket 164 fixes the second muffler 152 to the swivel base (fuselage) 2 . As a result, the first muffler 151 and the third muffler 153 can be attached to the prime mover 4, and the second muffler 152 can be attached to the swivel base 2 separately. , the second muffler 152 can be easily attached.

As shown in FIG. 13B, the second fixed bracket 160 has a muffler mounting portion 161, a fastening portion 162, and an upper cover 163. As shown in FIG. The muffler mounting portion 161, the fastening portion 162, and the upper cover 163 are formed by bending a thick steel plate, for example. The muffler attachment portion 161 includes an upper plate 161a, a side plate 161b, a rear plate 161c, and a front plate 161d.

As shown in FIG. 13B , the upper plate 161 a is arranged such that the plate surface faces the vertical direction, the lengths in the machine width direction and the longitudinal direction are longer than the lengths in the vertical direction, and constitutes the upper part of the muffler mounting portion 161 . It is a plate-shaped part that A first muffler 151 and a third muffler 153 are attached to the upper surface of the upper plate 161a by fasteners such as bolts. Specifically, the first muffler 151 is attached to one side (left side) of the top plate 161a, and the second muffler 152 is attached to the other side (right side) of the top plate 161a. The side plate 161b is a portion extending downward from the inner (left) end portion of the upper plate 161a in the body width direction, and is attached to the outer side (right side) of the motor 4 in the body width direction, that is, the flywheel 4c and bolts. are secured by fasteners of

As shown in FIG. 13B, the rear plate 161c is a portion extending downward from the rear end of the upper plate 161a, and is a rib connecting the upper plate 161a and the side plate 161b.
As shown in FIG. 13B, the front plate 161d is a portion extending downward from the front end of the upper plate 161a, and is a rib that connects the upper plate 161a and the side plate 161b.
As shown in FIG. 13B , the fastening portion 162 is a portion that fastens the first muffler 151 to the muffler attachment portion 161 by sandwiching the first muffler 151 together with the muffler attachment portion 161 . The fastening portion 162 includes a first attached portion 162a, a second attached portion 162b, and a curved portion 162c. The first attached portion 162a and the second attached portion 162b are portions that are fastened to the upper portion of the muffler attachment portion 161 with fasteners such as bolts. One side of the curved portion 162c in the machine width direction is connected to the first attached portion 162a, and the other side in the machine width direction is connected to the second attached portion 162b. are doing. That is, the curved portion 162c fits the upper portion of the first muffler 151 into the concave surface (lower surface) of the curved portion 162c, and the concave portion 84a and the upper portion of the muffler mounting portion 161 sandwich the first muffler 151 therebetween.

As shown in FIG. 13B , the upper cover 163 is a member that covers the upper portion of the first muffler 151 and is arranged above the muffler mounting portion 161 . The upper cover 163 is attached to the muffler attachment portion 161 with fasteners such as bolts.
As shown in FIGS. 13A and 13B, the third fixing bracket 164 is a member for attaching the second muffler 152 to the vehicle body. For example, the third fixing bracket 164 is attached to the partition plate 36 and supports the second muffler 152 with respect to the vehicle body via the partition plate 36 . The third fixing bracket 164 is formed by bending a thick steel plate, for example. The third fixed bracket 164 has a mounting piece 164a and a support portion 164b. The mounting piece 164 a is a plate-like portion whose length in the width direction and the length in the vertical direction are longer than the length in the front-rear direction, and is attached to the partition plate 36 . Specifically, the mounting piece 164a is fastened to the other side (right side) of the front surface of the partition plate 36 with a fastener such as a bolt.

As shown in FIG. 13B, the support portion 164b is a portion that supports the second muffler 152. As shown in FIG. It is a plate-shaped portion that extends forward from the front upper portion of the attachment piece 164a, and whose length in the front-rear direction and the length in the width direction of the machine body are longer than the length in the vertical direction. The second muffler 152 is fastened to the front upper surface of the support portion 164b with fasteners such as bolts.
FIG. 16 shows a side view of the rear part of the swing work machine 1, and FIG.

As shown in FIGS. 16 and 17, the fuel cylinder 130 is accommodated from an imaginary surface 182 in contact with an upper member 180 arranged above the fuel cylinder 130 and a lower member 181 arranged below the upper member 180. It is arranged on the inner side of the portion 81 .
As shown in FIGS. 16 and 17, the upper member 180 is the upper portion of the frame body 83, for example. Specifically, the upper member 180 is a portion configured by the rear portion of the second portion 83a2 of the first column portion 83a, the rear portion of the second portion 83b2 of the second column portion 83b, and the connecting rod 83c. The upper member 180 is arranged above the rear portion of the fuel cylinder 130 . The upper member 180 (upper portion of the frame body 83) protrudes rearward from the fuel cylinder 130. As shown in FIG. In other words, the rear end 180 a of the upper member 180 (the rear end in the longitudinal direction of the machine body) is located behind the fuel cylinder 130 .

The lower member 181 is, for example, the installation portion 106 on which the fuel cylinder 130 is installed. Specifically, it is the rear portion of the installation portion 106 . Specifically, the lower member 181 is the extended portion 114 provided at the rear portion of the installation portion 106 . A rear portion of the lower member 181 (extending portion 114 ) protrudes rearward from the fuel cylinder 130 . In other words, the rear end 181 a of the lower member 181 (extending portion 114 ) is positioned rearward of the fuel cylinder 130 .

As shown in FIG. 17, the virtual surface 182 is a surface that contacts the rear end 180a of the upper member 180 and the rear end 181a of the lower member 181. As shown in FIG. Since the rear end 180a of the upper member 180 and the rear end 181a of the lower member 181 protrude further rearward than the fuel cylinder 130, the fuel cylinder 130 is located forward of the imaginary plane 182, i. is arranged on the medial side.

When the cover 87 is provided, the portion of the lower member 181 with which the imaginary surface 182 contacts is a hinge device provided on the rear side of the extension portion 114 and supporting the lower portion of the cover 87 so as to be openable and closable. It may be a device. Further, if another member is provided on the rear side of the extended portion 114, the portion of the lower member 181 with which the virtual surface 182 contacts may be the other member.

Lower member 181 may be weight 38, as shown in FIG. A rear portion of the weight 38 protrudes rearward from the fuel cylinder 130 . In other words, the upper rear end portion 38 a of the weight 38 on the upper and rear end side is located behind the fuel cylinder 130 . In this case, the imaginary surface 182 contacts the rear end 180a of the upper member 180 and the upper rear end portion 38a of the weight 38, and the fuel cylinder 130 is arranged on the inner side of the housing portion 81 relative to the imaginary surface 182. .

Note that the lower member 181 may be both the installation portion 106 (the extension portion 114 or the hinge device, etc.) and the weight 38 . In addition, in the present embodiment, the virtual plane 182 is a plane in contact with the upper member 180, the installation portion 106 (the extension portion 114 or the hinge device, etc.), and the weight 38, but the virtual plane 182 It may be a surface in contact with the upper member 180 and either the installation portion 106 or the weight 38 . That is, the imaginary surface 182 does not have to contact the weight 38 when it contacts the upper member 180 and the installation section 106 , and does not need to contact the installation section 106 when it contacts the upper member 180 and the weight 38 .

As shown in FIG. 17 , since the fuel cylinder 130 is arranged on the inner side (front side, back side) of the housing portion 81 with respect to the imaginary plane 182 , a gap 183 is formed between the imaginary plane 182 and the fuel cylinder 130 . is formed. Thereby, the fuel cylinder 130 can be protected. In other words, when the rear portion of the swing work machine 1 abuts on the abutting portion such as a wall parallel to the imaginary plane 182, the upper member 180 and the lower member 181 abut on the abutting portion before the fuel cylinder 130. Therefore, the fuel cylinder 130 can be protected.

The revolving work machine 1 described above includes a revolving base 2 , a motor 4 mounted on the revolving base 2 , a work device 20 provided on the revolving base 2 , and a support for supporting a fuel cylinder 130 containing fuel for the motor 4 . a mechanism 90; According to the above configuration, the swing work machine 1 can be driven by the fuel stored in the fuel cylinder 130 .
The swing work machine 1 also includes a bonnet 40 that forms an engine room E that houses the prime mover 4 , and the support mechanism 90 supports the fuel cylinder 130 above the bonnet 40 . According to the above configuration, by arranging the fuel cylinder 130 above the bonnet 40, the space above the bonnet 40 can be effectively utilized.

The bonnet 40 can be opened and closed, and the support mechanism 90 movably supports the fuel cylinder 130 between an installation position K1 above the hood 40 and a retracted position K2 that does not interfere with the hood 40 when the hood 40 is opened or closed. do. According to the above configuration, the fuel cylinder 130 is arranged above the hood 40 , and interference between the fuel cylinder 130 and the bonnet 40 prevents the fuel cylinder 130 from interfering with opening and closing of the hood 40 . Therefore, both the effective use of the space above the hood 40 and the convenience of opening and closing the hood 40 can be achieved.

The support mechanism 90 also has a first pivot shaft 94 that pivots the fuel cylinder 130 horizontally. According to the above configuration, the arrangement of the fuel cylinder 130 can be easily changed between the installation position K1 and the retracted position K2 by a simple operation of rotating the fuel cylinder 130 around the first pivot shaft 94. .
Further, the support mechanism 90 supports the fuel cylinder 130 inside the turning locus C2 of the turning base 2 at the installation position K1. According to the above configuration, when the swivel base 2 turns, the fuel cylinder 130 is within the turning locus C2 of the swivel base 2, so that the fuel cylinder 130 can be prevented from coming into contact with surrounding obstacles.

The support mechanism 90 also has a second pivot shaft 101 pivotally supporting the fuel cylinder 130 downward from the retracted position K2. According to the above configuration, the fuel cylinder 130 can be arranged below the retracted position K2 by a simple operation of rotating the fuel cylinder 130 downward about the second pivot shaft 101 .
In addition, the support mechanism 90 connects the base portion 91 that supports the first pivot shaft 94 , the first pivot shaft 94 and the second pivot shaft 101 , and rotates around the first pivot shaft 94 . It has a first pivot bracket 95 and a second pivot bracket 102 that connects the second pivot shaft 101 and the installation portion 106 and rotates around the second pivot shaft 101. When the first pivot bracket 95 is rotated around the first pivot shaft 94, the second pivot bracket 102 is locked, and a notch 93b is formed to limit the rotation range of the first pivot bracket 95. there is According to the above configuration, it is possible to suppress unintended rotation of the fuel cylinder 130 around the first pivot shaft 94 .

In addition, an upper member 85 is provided to cover the upper side of the fuel cylinder 130 arranged at the installation position K1 above the bonnet 40, and the support mechanism 90 is arranged to extend toward the outer side of the fuselage with respect to the lower portion of the fuel cylinder 130 arranged at the installation position K1. The distance between the extension 114 and the upper member 85 is narrower than the diameter of the fuel cylinder 130 . According to the above configuration, the upper portion of the fuel canister 130 is prevented from coming into contact with the outside, and the fuel canister 130 is kept above the hood 40 by surrounding the fuel canister 130 with the upper member 85 and the extension portion 114 . be able to.

The support mechanism 90 also has fasteners 112 for fixing the fuel cylinder 130 . According to the above configuration, the support mechanism 90 can firmly support and fix the fuel cylinder 130 with the fastener 112 .
Also, the fuel is natural gas or petroleum gas, and is stored in the fuel cylinder 130 in a compressed gas or liquid state. According to the above configuration, when the second fuel is natural gas, black smoke, NOx, Less SOx, etc. Further, when the second fuel is petroleum gas, almost no soot is emitted, and PM and NOx are small. Therefore, the swing work machine 1 can reduce the influence on the environment while maintaining work efficiency.

Also provided is a spare cylinder (reserve tank) 132b that supplies fuel to the engine 4 when the remaining amount of fuel in the fuel cylinder 130 drops below a predetermined amount. According to the above configuration, even when the remaining amount of fuel in the fuel cylinder 130 is low, the swing work machine 1 can continue the work without immediately stopping the work.
The revolving work machine (work machine) 1 includes a revolving base 2 provided with a driver's seat 8, a work device 20 provided at the front part of the revolving base 2, and an engine room provided at the rear part of the revolving base 2. A bonnet 40 forming E and a protection mechanism 60 having a support 61 arranged above the hood 40 and protecting a driver's seat 8, and containing a stored object between the hood 40 and the support 61. A housing portion 81 is formed. According to the above configuration, the space between the bonnet 40 and the strut 61 can be effectively used to secure a space for storing the contents.

The swing work machine 1 also includes a support body 80 that supports the strut 61 and forms a housing portion 81. The support body 80 includes a vertical member 84 extending upward from the front side of the hood 40 and an upper portion of the vertical member 84. an upper member 85 extending rearwardly from the bonnet 40 and positioned above the bonnet 40; the strut 61 is attached to the upper member 85; , the upper member 85, and . According to the above configuration, the storage part 81 can not only easily form a part for storing a stored object, but also firmly support the column 61 .

In addition, the protection mechanism 60 has a pair of struts 61 spaced apart in the width direction of the fuselage, and the upper member 85 extends from one side to the other side in the width direction of the fuselage. are attached to one side and the other side of the upper member 85 in the machine body width direction. According to the above configuration, the load applied by the roof 62 can be distributed between one side and the other side of the upper member 85 in the machine body width direction.

Further, the strut 61 includes first portions 83a1 and 83b1 extending upward from the front side of the bonnet 40, and second portions 83a2 curved rearward from the upper ends of the first portions 83a1 and 83b1 and arranged above the bonnet 40. , 83b2, and a third portion 61b extending upward from the upper portions of the second portions 83a2, 83b2. It is formed in a space surrounded by . According to the above configuration, not only can the accommodating portion 81 be easily configured between the strut 61 and the bonnet 40, but also the accommodating portion 81 can be strongly configured.

In addition, the vertical member 84 partitions the accommodating portion 81 and the space on the driver's seat 8 side of the accommodating portion 81 . According to the above configuration, it is possible to separate the driver's seat 8 side and the part for storing the contents.
The swing work machine 1 also includes a cover 87 that covers the rear side of the accommodation space. According to the above configuration, it is possible to prevent the stored items from being exposed to the external environment, and for example, it is possible to prevent the stored items from coming into direct contact with any object when performing work while turning. .

In addition, the swing work machine 1 includes a support mechanism 90 that supports a contained object. The bonnet 40 can be opened and closed. It is movably supported to a retracted position K2 that does not interfere with the hood 40 when opening and closing the bonnet. According to the above configuration, it is possible to arrange the stored items above the bonnet 40 at the accommodation position K1, and to avoid interference between the stored items and the hood 40 at the retracted position K2. Therefore, it is possible to improve the workability by arranging the accommodating portion 81 and the bonnet 40 in the vertical direction without hindering the opening and closing of the hood 40, and to effectively utilize the space.

The swing work machine 1 also includes a prime mover 4 mounted on the swivel base 2 , and a stored object is a fuel cylinder 130 that stores fuel for the prime mover 4 . According to the above configuration, the swing work machine 1 can be driven by the fuel stored in the fuel cylinder 130 .
The revolving work machine 1 also includes a revolving base 2, a working device 20 provided on the revolving base 2, a prime mover 4 driven by selectively using either a first fuel or a second fuel, a first fuel , a support mechanism 90 for supporting a fuel cylinder 130 for containing a second fuel, and a fuel switching unit 133 for switching the fuel supplied to the prime mover 4 between the first fuel and the second fuel. , is equipped with According to the above configuration, when the remaining amount of one of the fuel tank 50 and the fuel cylinder 130 becomes low, the other fuel can be used to drive the prime mover 4 and the work can be continued.

The swing work machine 1 also includes an operation tool 141 for switching the fuel supplied to the prime mover 4 . According to the above configuration, the operator can easily switch the fuel for driving the prime mover 4 according to the work situation, environment, and the like.
Further, the support mechanism 90 detachably supports the fuel cylinder 130 . According to the above configuration, when the swing work machine 1 is driven by the first fuel stored in the fuel tank 50, it can be driven with the fuel cylinder 130 removed. As a result, when the fuel cylinder 130 has a small remaining amount, the work can be performed more flexibly, such as continuing the work even when the fuel cylinder 130 is replaced.

The swing work machine 1 also has a first indicator 143c indicating the remaining amount of the first fuel contained in the fuel tank 50 and a second indicator 143d indicating the remaining amount of the second fuel contained in the fuel cylinder 130. and have. According to the above configuration, the operator can easily recognize the remaining amount of the first fuel and the remaining amount of the second fuel by checking the first indicator 143c and the second indicator 143d.

The revolving work machine 1 also includes a driver's seat 8 provided on the revolving base 2 , and the operating tool 141 is arranged at a position that can be operated by a worker seated on the driver's seat 8 . According to the above configuration, when the remaining amount of either the fuel tank 50 or the fuel cylinder 130 becomes low during the operation of the swinging work machine 1, the worker can easily The fuel supplied to the prime mover 4 can be switched between the first fuel and the second fuel.

The swing work machine 1 also includes a display mechanism (third indicator) 143e that indicates whether the fuel being supplied to the prime mover 4 is the first fuel or the second fuel. According to the above configuration, the operator can easily grasp whether the fuel supplied to the prime mover 4 is the first fuel or the second fuel.
Also, the second fuel is stored in the fuel cylinder 130 in a compressed gas or liquid state. According to the above configuration, the swing work machine 1 can be driven by the fuel stored in the fuel cylinder 130 .

The exhaust structure 54 of the swing work machine (work machine) 1 includes a first muffler 151 into which the exhaust gas discharged from the prime mover 4 is introduced, and a first receiving portion 152a that receives the exhaust gas discharged from the first muffler 151. , a second muffler 152 having a muffler main body portion 152b for passing the exhaust gas received from the first receiving portion 152a and a discharge portion (discharge pipe) 152c for discharging the exhaust gas from the muffler main body portion 152b; A third muffler 153 into which the discharged exhaust gas is introduced, and a tail pipe 154 through which the exhaust gas discharged from the third muffler 153 is discharged. At least a part of the exhaust gas path from the prime mover 4 to the first receiving portion 152a via the first muffler 151, and from the discharge portion 152c to the tail pipe 154 via the third muffler 153. At least a part of the exhaust gas path leading to the exhaust gas is arranged at a position facing each other. According to the above configuration, the exhaust gas received by the second muffler 152 from the first receiving portion 152a is discharged from the discharge portion 152c in the direction opposite to the exhaust direction received by the first receiving portion 152a. As a result, at least a portion of the exhaust gas path from the prime mover 4 to the first receiving portion 152a via the first muffler 151 and at least a portion of the exhaust gas path from the discharge portion 152c to the tail pipe 154 via the third muffler 153. can be arranged opposite to each other, the exhaust structure 54 can be made compact, and the exhaust structure 54 can be arranged even in a narrower space.

It also has a first fixing bracket 155 for fixing the first muffler 151 , the second muffler 152 and the third muffler 153 to the motor 4 . According to the above configuration, the first muffler 151, the second muffler 152, and the third muffler 153 can be fixed to the same vibration system.
Also, a second fixing bracket 160 for fixing the first muffler 151 and the third muffler 153 to the prime mover 4, and a third fixing bracket 164 for fixing the second muffler 152 to the swivel base may be provided. According to the above configuration, the first muffler 151 and the third muffler 153 can be attached to the prime mover 4, and the second muffler 152 can be attached to the swivel base 2. Therefore, even when the space for installing the exhaust structure 54 is relatively narrow, Even if there is, the first to third mufflers 151 to 153 can be easily attached.

Also, the first muffler 151 is integrated with the three-way catalytic converter. According to the above configuration, harmful components in the exhaust gas can be purified.
The discharge portion 152c has a discharge pipe through which the exhaust gas discharged from the muffler main body portion 152b passes. A second receiving portion 153 b is connected, and the second receiving portion 153 b introduces the exhaust gas discharged from the discharge pipe 152 c and the outside air into the third muffler 153 . For example, the second receiving portion 153b has an expanded structure whose diameter increases toward the muffler main body 152b, and the end of the discharge pipe 152c is inserted into the expanded structure. According to the above configuration, exhaust temperature and noise can be efficiently reduced with a simple configuration.

Further, a first exhaust pipe (exhaust pipe) 151c through which the exhaust gas discharged from the first muffler 151 passes is provided, and the first receiving portion 152a receives the exhaust gas discharged from the first exhaust pipe 151c and outside air into the muffler body portion. 152b. For example, the first receiving portion 152a has an expanded pipe structure that expands in diameter as it goes away from the muffler body portion 152b, and the end of the first exhaust pipe 151c is inserted into the expanded pipe structure. According to the above configuration, exhaust temperature and noise can be efficiently reduced with a simple configuration.

The swing work machine 1 also includes an exhaust structure 54 . According to the above configuration, it is possible to realize the swing work machine 1 having the excellent effects described above.
Further, the prime mover 4 is a spark ignition type engine. According to the above configuration, it is possible to further reduce the exhaust temperature and noise of the exhaust gas emitted by burning the fuel.
Further, the fuel cylinder 130 is provided with an accommodation portion 81 that accommodates the fuel cylinder 130, an upper member 180 that is provided above the fuel cylinder 130, and a lower member 181 that is arranged below the upper member 180. It is arranged on the inner side of the housing portion 81 with respect to the imaginary surface 182 in contact with the upper member 180 and the lower member 181 .

According to the above configuration, the upper member 180 and the lower member 181 can protect the fuel cylinder 130 .
The support mechanism 90 also has an installation portion 106 for installing the fuel cylinder 130 , and the lower member 181 is the installation portion 106 .
According to the above configuration, the upper member 180 and the installation portion 106 can protect the fuel cylinder 130 .

The swivel base 2 also has a weight 38 arranged on the side opposite to the working device 20 , and the lower member 181 is the weight 38 .
According to the above configuration, the upper member 180 and the weight 38 can protect the fuel cylinder 130 .
Although the present invention has been described above, it should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

For example, in the embodiment described above, the fuel cylinder 130 is housed in the housing portion 81. In addition to or instead of the fuel cylinder 130, the housing portion 81 may contain various objects such as tools and maintenance parts. may be accommodated.
Further, in the above-described embodiment, an example in which the present invention is applied to a backhoe that is a revolving work machine has been described, but the present invention is not limited to this application, and can be applied to various types of construction machinery, civil engineering machinery, agricultural machinery, and the like. Applicable to work machines.

Further, in the above-described embodiment, the fuel tank 50 and the fuel cylinder 130 are provided, and the fuel supplied to the motor 4 is switchable. However, the present invention is not limited to this. For example, the fuel tank 50 may be omitted and only the fuel supplied from the fuel cylinder 130 may be supplied to the prime mover. In this case, the fuel filler port 50b may also be omitted, and the portion where the fuel filler port 50b was arranged may be covered with an exterior cover. In such a case, the exterior cover may be, for example, a mesh-like cover that communicates the outside of the bonnet 40 with the inside of the engine room E, and its shape and structure are not limited.

1 Swivel work machine (work machine, backhoe)
2 swivel base (fuselage)
4 prime mover 20 work device 38 weight 40 bonnet 81 housing portion 85 upper member 90 support mechanism 91 base portion 93b notch 94 first pivot shaft 95 first pivot bracket 101 second pivot shaft 102 second pivot bracket 106 installation portion 112 fasteners (belts)
114 extension part 130 fuel cylinder 132b spare cylinder (reserve tank)
180 upper member 181 lower member 182 virtual plane E engine room K1 installation position (housing position)
K2 Retreat position

Claims (14)

a swivel;
a prime mover mounted at the rear of the swivel base;
a bonnet forming an engine room that houses the prime mover;
a work device provided on the swivel base;
a support mechanism for supporting a fuel cylinder containing fuel for the prime mover;
with
The bonnet is configured to be openable and closable by vertically swinging,
The support mechanism has an installation position where the fuel cylinder is supported above the bonnet and the motor and at a position that restricts opening and closing of the hood, and a horizontal rotation around an axis extending vertically from the installation position. The turning work machine is movably supported at a retracted position moved to a position where opening and closing of the bonnet is not hindered . a driver's seat provided on the swivel;
a support forming an accommodation portion that accommodates the fuel cylinder at the installation position;
a protection mechanism that has a support that is arranged above the housing portion and that protects the driver's seat;
a mounting portion provided on the upper portion of the support and to which the protection mechanism is mounted;
The turning work machine according to claim 1 , comprising : The swing work machine according to claim 2 , wherein the strut is attached to the attachment portion . The swing work machine according to any one of claims 1 to 3, wherein the support mechanism has a first pivot shaft that pivotally supports the fuel cylinder in a horizontal direction. The swing work machine according to any one of claims 1 to 4, wherein the support mechanism supports the fuel cylinder inside the swivel locus of the swivel base at the installation position. The swing work machine according to any one of claims 1 to 4, wherein the support mechanism has a second pivot shaft that pivotally supports the fuel cylinder downwardly from the retracted position. The support mechanism is
a first pivot shaft that pivotally pivots the fuel cylinder in a horizontal direction;
a base supporting the first pivot shaft;
a first pivot bracket that connects the first pivot shaft and the second pivot shaft and rotates around the first pivot shaft;
an installation unit for installing the fuel cylinder;
a second pivot bracket that connects the second pivot shaft and the installation portion and rotates around the second pivot shaft;
has
The base has a notch for limiting the rotation range of the first pivot bracket by engaging the second pivot bracket when the first pivot bracket is rotated around the first pivot shaft. 7. The swing work machine according to claim 6, wherein the swing work machine is formed. An upper member that covers an upper portion of the fuel cylinder arranged at the installation position above the hood,
The support mechanism includes an extension part facing the lower part of the fuel cylinder arranged at the installation position in the aircraft outer direction,
The swing work machine according to any one of claims 1 to 7, wherein the distance between the extension portion and the upper member is narrower than the diameter of the fuel cylinder. The swing work machine according to any one of claims 1 to 8, wherein the support mechanism has fasteners for fixing the fuel cylinder. The swing work machine according to any one of claims 1 to 9, wherein the fuel is natural gas or petroleum gas, and is stored in the fuel cylinder in a compressed gas or liquid state. The swing work machine according to any one of claims 1 to 10, further comprising a spare cylinder that supplies fuel to the prime mover when the remaining amount of fuel in the fuel cylinder drops below a predetermined amount. a housing portion that houses the fuel cylinder;
an upper member provided on the upper side of the fuel cylinder;
a lower member disposed below the upper member;
with
The swing work machine according to any one of claims 1 to 11, wherein the fuel cylinder is arranged on the inner side of the accommodating section with respect to a virtual plane contacting the upper member and the lower member. The support mechanism has an installation portion for installing the fuel cylinder,
The swing work machine according to claim 12, wherein the lower member is the installation portion. The swivel base has a weight arranged on the side opposite to the working device,
The swing work machine according to claim 12, wherein the lower member is the weight.

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