JP7325397B2 - work vehicle - Google Patents

Description

The present invention relates to a support structure for a working device in a working vehicle.

In the work vehicle disclosed in Patent Document 1, crawler-type traveling devices are provided on the right and left sides of the machine body, and the machine body is supported by the right and left traveling devices.
Right and left support arms are supported by the front part of the machine body so as to be able to swing up and down about a support axis extending in the left-right direction, and extend forward. It is supported by the left support arm. A mower is provided with a hydraulic motor, and the mower is driven by the hydraulic motor.

JP-A-4-197104

Instead of providing a hydraulic motor for driving the working device as in Patent Document 1, it has been proposed to transmit the power of a prime mover (engine, electric motor, etc.) provided to the machine body to the working device. ing.

SUMMARY OF THE INVENTION An object of the present invention is to configure a support structure for a working device so that the power of a driving unit provided on a machine body can be transmitted to the working device without difficulty.

The work vehicle of the present invention includes right and left traveling devices that support the machine body, and is supported by the front part of the machine body so as to be able to swing up and down around a support axis extending in the left-right direction, and extends forward. and a work device supported by the right and left support arms, and one of the right and left support arms corresponds to the right and left travel devices in a plan view. and supports a portion of the work device that faces between the right and left traveling devices, and the other of the right and left supporting arms is positioned between the right and left traveling devices in plan view. A transmission mechanism that is arranged laterally outward with respect to and supports the right end or left end of the working device, and transmits the power of the prime mover provided on the machine body to the working device, the other of the right and left It is supported by a support arm.

According to the present invention, in the right and left support arms that support the working device, one of the right and left support arms is arranged between the right and left traveling devices in plan view, and It supports the opposing parts between the left running gear.
The other of the right and left support arms is arranged laterally outside the right or left travel device in plan view, and supports the right end or left end of the working device. A transmission mechanism that transmits the power of the driving unit provided on the machine body to the work device is supported by the other of the right and left support arms.

When the power transmission mechanism is attached to the right and left intermediate portions of the working device, the working area of the working device is reduced by the width of the power transmission mechanism because the portion where the power transmission mechanism is arranged does not work.
In contrast, according to the present invention, the transmission mechanism is supported by the other of the right and left support arms, so that the transmission mechanism can be connected to the right or left end of the working device. As a result, the transmission mechanism can be easily constructed so as not to enter the working area of the working device, so that the working area of the working device is not narrowed, which is advantageous in terms of improving the working performance of the working device. .

According to the present invention, the transmission mechanism is supported by the other right or left support arm that supports the working device, so that the other right or left support arm can perform the transmission mechanism function in addition to supporting the working device. Since it also has a support function, it is advantageous in terms of structural simplification.

In the present invention, it is preferable that the support shaft is arranged above the travel device and rearward with respect to the front end portion of the travel device in a side view.

According to the present invention, since the support axis at which the support arm is supported by the fuselage is arranged above the travel device in a side view, the support arm is arranged at a relatively high position. This has the advantage of avoiding contact between obstacles on the work site and the support arm.
In the transmission mechanism supported by the other of the right and left support arms, even if the vertical width of the transmission mechanism is large, it is advantageous in terms of avoiding contact between the transmission mechanism and obstacles on the work site.

According to the present invention, the support axis at which the support arm is supported by the machine body is arranged rearward with respect to the front end portion of the travel device in a side view, so that the working device approaches the front end portion of the travel device. Since it is arranged, it is advantageous in terms of suppressing the overall length of the working vehicle including the working device.

In the present invention, the traveling device includes a track frame arranged along the front-rear direction, a plurality of rollers supported by the track frame, and a drive unit arranged above the front-rear intermediate portion of the track frame. and a crawler belt attached to the drive wheel and the roller wheel, the support shaft center being arranged on the front side of the drive wheel in a side view, and attached to the crawler belt. It is preferable if it is arranged on the upper side.

According to the present invention, when the traveling device is constructed as a crawler type, the crawler belts are arranged in a triangular shape when viewed from the side. If the support arm is positioned in front of the crawler belt and positioned above the crawler belt, the support arm is positioned at a relatively high position.
This is advantageous in terms of avoiding contact between obstacles on the work site and the support arm, and is advantageous in terms of avoiding contact between obstacles on the work site and the transmission mechanism.

In the present invention, an output unit provided in the front part of the fuselage for outputting the power of the driving unit, and an output unit extending from the output unit toward the other of the right and left support arms and connected to the transmission mechanism A power transmission shaft is provided, and power of the driving portion is transmitted to the working device via the output portion, the transmission shaft, and the transmission mechanism.

According to the present invention, when the power of the prime mover is transmitted to the transmission mechanism, the output part for outputting the power of the prime mover is provided in the front part of the fuselage, and the transmission shaft extends from the output part to the other of the right and left sides. It extends towards the support arm and is connected to the transmission mechanism. As a result, the power of the prime mover is transmitted to the working device through the output section, the transmission shaft, and the transmission mechanism without difficulty.

In the present invention, the transmission shaft is arranged at a position higher than the input shaft that receives the power of the driving portion in the output portion, and the transmission portion that transmits the power of the input shaft to the transmission shaft is attached to the output portion. Preferably provided.

According to the present invention, in the transmission shaft connected to the transmission mechanism and the input shaft of the output section, the transmission shaft is arranged at a position higher than the input shaft of the output section, thereby connecting the transmission shaft to the transmission mechanism. is easier to do.
According to the present invention, in the configuration described above, the power of the input shaft of the output section is transmitted to the transmission shaft without difficulty via the transmission section (transmission gear, transmission chain, etc.).

In the present invention, the transmission mechanism includes a drive rotator attached to the transmission shaft, a driven rotator provided in the work device for driving the work device, and attached to the drive rotator and the driven rotator. and a tension rotating body capable of operating the endless rotating body in a tensioned state. is preferably supported by the support member.

According to the present invention, the transmission mechanism has a drive rotator attached to the transmission shaft, a driven rotator provided in the working device, an endless rotator attached to the drive rotator and the driven rotator, and a tension rotator. ing.

According to the present invention, the tension rotator is supported by the supporting member swingably supported around the transmission shaft to operate the endless rotator (transmission belt, transmission chain, etc.) in a tensioned state.
Since the support member is supported so as to be able to swing around the transmission shaft, the tension rotor is arranged at a position close to the drive rotor. The length can be easily increased, and the transmission efficiency from the drive rotor to the endless rotor is improved.

In the present invention, it is preferable that one of the right and left support arms is arranged between the traveling device on the opposite side of the other of the right and left support arms and the output section in plan view. is.

According to the present invention, as described above, the output section for outputting the power of the driving section is provided in the front part of the fuselage, and the transmission shaft extends from the output section toward the other of the right and left support arms (transmission mechanism). In the extended state, one of the right and left support arms is arranged between the traveling device on the opposite side of the other right and left support arms in a plan view and the output section, whereby the right and left One support arm is arranged while avoiding interference with the output part and the transmission shaft.

In the present invention, an elevating cylinder capable of elevating the working device is provided, and the elevating cylinder is disposed between one of the right and left support arms and the output section in a plan view. preferred.

According to the present invention, as described above, in a state in which one of the right and left support arms is arranged, when the lifting cylinders capable of lifting and lowering the working device are provided, the lifting cylinders can be positioned on the right and left sides in a plan view. By being arranged between one support arm and the output section, the elevating cylinder is arranged while avoiding interference with the output section and the like.

According to the present invention, the elevating cylinder is arranged between the right and left support arms, and is connected to a position near the left-right center of the working device. well-balanced.

In the present invention, it is preferable that a reinforcing frame is provided that is connected to the working device along the left-right direction, and that the right and left support arms are attached to the reinforcing frame.

According to the present invention, when the reinforcing frame is connected to the working device along the left-right direction, the right and left supporting arms are attached to the reinforcing frame, thereby improving the supporting strength of the working device by the right and left supporting arms. do.

In the present invention, it is preferable that an elevating cylinder capable of elevating the working device is provided, and the elevating cylinder is attached to the reinforcing frame.

According to the present invention, as described above, when a lifting cylinder capable of lifting and lowering the working device is provided in a state where the reinforcing frame is connected to the working device along the left-right direction, the lifting cylinder is attached to the reinforcing frame. , the support strength of the working device by the elevating cylinder is improved.

In the present invention, the right end portion of the working device and the right end portion of the right traveling device are arranged at substantially the same position when viewed in the front-rear direction, and the left end portion of the working device and the left end portion of the left traveling device are arranged. are arranged at approximately the same position when viewed in the front-rear direction, and the transmission mechanism is supported laterally outwardly of the other of the right and left support arms.

In the work vehicle, it is preferable to set the distance between the right and left travel devices wide for the purpose of running stability of the work vehicle. The distance between the right end of the first traveling device and the left end of the left traveling device cannot be made larger than the width of the bed of the truck.

According to the present invention, in the above-described state, the right end portion of the working device and the right end portion of the right traveling device are arranged at substantially the same position when viewed in the front-rear direction, and the left end portion of the working device and the left end portion of the left traveling device are arranged. are arranged at approximately the same position when viewed in the front-rear direction.
As a result, it is possible to prevent the right and left travel devices and the work device from interfering when the work vehicle is placed on the platform of the truck while ensuring the width (work area) of the work device.

According to the present invention, since the transmission mechanism is supported laterally outwardly of the other of the right and left support arms, the right end of the working device and the right end of the right travel device are positioned substantially at the same position when viewed in the front-rear direction. The left end portion of the working device and the left end portion of the left traveling device can be easily arranged at approximately the same position when viewed in the front-rear direction.

In the present invention, a grounding member supported on the upper part of the working device is provided so that its posture can be changed between a grounded position and a retracted position, and in the grounding position, the grounding member moves forward from the upper part of the working device. and extends downward to support the working device by being in contact with the ground, and in the retracted position, the grounding body is located rearward of the front end of the working device in a side view, and is flat. It is preferably arranged above the working device so as to be positioned between the right end and the left end of the working device when viewed.

According to the present invention, when the grounding member for setting the height from the ground to the working device is provided, when the grounding member is set to the grounding position, the grounding member extends forward and downward from the upper portion of the working device. , grounded to support the implement. As a result, when the work vehicle moves forward, the grounding member comes into contact with the ground before the work device, so that the work device can easily follow the unevenness of the ground.

When the grounding member is set to the retracted position, the grounding member is positioned rearward of the front end of the working device in side view and between the right end and left end of the working device in plan view. As a result, when the work vehicle is placed on the truck bed, the grounding member hardly interferes with the truck bed, and the grounding member hardly becomes an obstacle.

It is a right side view of a work vehicle. It is a left side view of a work vehicle. 1 is a plan view of a work vehicle; FIG. It is a rear view of a work vehicle. It is a longitudinal right side view of a work vehicle. Fig. 3 is a longitudinal front view of the vicinity of the front part of the working vehicle; FIG. 4 is a plan view of the vicinity of the front portion of the working vehicle; It is a longitudinal right side view near a mission case. It is a longitudinal left side view near a mission case. It is a cross-sectional plan view of the vicinity of the mission case. It is a bottom view near a mission case. It is a schematic diagram showing a transmission system from the engine to the right and left transmissions and the mowing device.

A work vehicle is shown in FIGS. 1 to 12 . 1 to 12, F indicates the forward direction, B indicates the rearward direction, U indicates the upward direction, D indicates the downward direction, R indicates the right direction, and L indicates the left direction. .

(Overall configuration of working vehicle)
As shown in FIGS. 1 to 4, a work vehicle includes a machine body 1, right and left crawler-type traveling devices 2 that support the machine body 1, and a transmission case 20 arranged near the center of the machine body 1. is provided.

In the work vehicle, a grass cutting device 3, which is a working device supported on the front part of the machine body 1 so as to be positioned on the front side with respect to the transmission case 20, and a machine body so as to be positioned on the rear side with respect to the transmission case 20 An engine 45, which is a driving part, is provided at the rear part of the vehicle.

(Configuration of traveling device)
As shown in FIGS. 1-4, the right and left traveling devices 2 include a track frame 17, four rollers 16, drive wheels 15, and crawler belts attached to the drive wheels 15 and rollers 16. 19 and a guide member 18 .

A rectangular pipe-shaped track frame 17 is arranged along the front-rear direction, four even-numbered rollers 16 are supported by the track frame 17, and a guide member 18 extends over the front and rear parts of the track frame 17. supported by The track frame 17 is a part of the fuselage 1 (see (Construction of upper horizontal frame and upper vertical frame of the fuselage) described later) and a part of the travel device 2 .

A crawler belt 19 is attached to the drive wheels 15 , the rollers 16 and the guide members 18 . The crawler belt 19 is rotationally driven by the drive wheel 15 , and the guide member 18 prevents the crawler belt 19 from coming off the roller 16 .

(Relationship between traveling device and mission case)
As shown in FIGS. 8 to 11, the right and left driving wheels 15 are supported by a transmission case 20 (see (Configuration of Transmission Case) described later).

The mission case 20 is arranged between the right track frame 17 and the left track frame 17 in a plan view, and the mission case 20 is positioned near the left and right centers A1 of the right and left traveling devices 2 (body 1). are placed in An input shaft 27 and an output shaft 28 of the mission case 20 (see (Configuration of mission case) described later and FIG. 12) are arranged at the left-right center A1 of the airframe 1 in plan view.

The right drive wheel 15 is arranged above the front-rear intermediate portion of the right track frame 17 in side view, and the left drive wheel 15 is arranged above the front-rear intermediate portion of the left track frame 17 in side view. , and the transmission case 20 is arranged in the vicinity of the front-rear central portion of the traveling device 2 .

As shown in FIGS. 1 and 2, the rotation center of the driving wheel 15 is the rotation center of two rollers 16 in the front and rear center of the four (even number) rollers 16 in plan view and side view Between (between the center of rotation of the second wheel 16 and the center of rotation of the third wheel 16). As a result, the number (two) of the front wheels 16 (the first wheel 16 and the second wheel 16) with respect to the drive wheel 15 and the rear wheel 16 (the third wheel 16 and the number (two) of the fourth wheel 16) are the same number.

(Composition of the lower lateral frame in the fuselage)
As shown in FIGS. 5, 6, 10, and 11, in a plan view, the front side of the transmission case 20 is arranged along the left-right direction on the front portion of the right track frame 17 and the front portion of the left track frame 17. A front lower horizontal frame 5 in the shape of a square pipe is connected across it.

As shown in FIGS. 4, 5, 10, and 11, in a plan view, the rear side of the transmission case 20 extends in the left-right direction along the rear portion of the right track frame 17 and the rear portion of the left track frame 17. A square pipe-shaped rear lower horizontal frame 6 is connected to the frame.

As shown in FIGS. 5, 6, 7, 10, and 11, the right reinforcing member 7, which is a plate material bent into a trapezoidal shape in plan view, is positioned in front of the right portion of the lower lateral frame 5 of the right track frame 17. , the right portion of the lower horizontal frame 5, and the rear portion of the right track frame 17 with respect to the right portion of the lower horizontal frame 5, and the right reinforcing member 7 is connected to the right It is connected across the track frame 17 and the right portion of the lower lateral frame 5 .

The left reinforcing member 7, which is a plate material bent into a trapezoidal shape in a plan view, is a portion of the left track frame 17 on the front side with respect to the left portion of the lower horizontal frame 5, the left portion of the lower horizontal frame 5, and the left side. The left reinforcing member 7 is connected to the left portion of the lower horizontal frame 5 and the rear portion of the track frame 17 , and the left reinforcing member 7 extends over the left track frame 17 and the left portion of the lower horizontal frame 5 . Concatenated.

The right reinforcing member 7 is a right front support bracket connected to the right truck frame 17 and extending toward the left truck frame 17 . The left reinforcing member 7 is a left front support bracket connected to the left truck frame 17 and extending toward the right truck frame 17 .

(Construction of support frame in airframe)
As shown in FIGS. 10 and 11 , the right rear support bracket 8 formed by bending a plate material is connected to the rear portion of the right track frame 17 and extends toward the left track frame 17 . . A left rear support bracket 8 formed by bending a plate material is connected to the rear portion of the left truck frame 17 and extends toward the right truck frame 17 .

As shown in FIGS. 5 to 11, right front and left front support frames 9 are provided. The right front support frame 9 is connected to the right reinforcement member 7 (right front support bracket) and extends upward, and the left front support frame 9 is connected to the left reinforcement member 7 (left front support bracket). and extends upward.

Right rear and left rear support frames 10 are provided. The right rear support frame 10 is connected to the right rear support bracket 8 and extends upward, and the left rear support frame 10 is connected to the left rear support bracket 8 and extends upward. It is

As a result, the right front support frame 9 is connected to the right truck frame 17 on the front side of the drive wheels 15 and the front lower lateral frame 5 via the right reinforcing member 7 (right front support bracket). ing. A right rear support frame 10 is connected via a right rear support bracket 8 to a portion of the right truck frame 17 behind the drive wheels 15 .

A left front support frame 9 is connected to a portion of the left truck frame 17 on the front side of the drive wheel 15 and the front lower lateral frame 5 via a left reinforcement member 7 (left front support bracket). A left rear support frame 10 is connected via a left rear support bracket 8 to a portion of the left truck frame 17 on the rear side of the drive wheel 15 .

(Configuration of Upper Horizontal Frame and Upper Vertical Frame in Airframe)
As shown in FIGS. 5 to 11, the upper part of the right front support frame 9 and the left front support frame 9 are positioned so that the front upper horizontal frame 11 is positioned above the transmission case 20 when viewed in the front-rear direction. connected across the top.

The rear upper horizontal frame 11 is connected across the upper part of the right rear support frame 10 and the upper part of the left rear support frame 10 so as to be positioned above the transmission case 20 in the front-rear direction view. there is

The right upper vertical frame 12 is connected across the top of the right front support frame 9 and the right rear support frame 10 so as to be positioned above the transmission case 20 in a side view.

The left upper vertical frame 12 is connected across the upper part of the left front support frame 9 and the upper part of the left rear support frame 10 so as to be positioned above the transmission case 20 in a side view.

As described above, the fuselage 1 includes the right and left track frames 17 (see the above-mentioned (configuration of the traveling device)), the front and rear lower lateral frames 5 and 6 (see the above-described (configuration of the lower lateral frames in the fuselage) ), right front and left front support frames 9, right rear and left rear support frames 10 (see (Construction of Support Frames in Airframe) above), front and rear upper lateral frames 11, right and left It has an upper vertical frame 12 and the like.

As shown in FIGS. 1 to 4, a transmission case 20 is constructed by right front and right rear support frames 9, left front and left rear support frames 10, front and rear upper horizontal frames 11, and right and left upper vertical frames 12. is surrounded.

(Configuration of mission case)
As shown in FIGS. 10, 11, and 12, the mission case 20 is provided with a central case 21, a right support case 22, and a left support case 23. As shown in FIGS.

In the central case 21, a central portion 24, a right transmission 25 connected to the right portion of the central portion 24, and a left transmission 26 connected to the left portion of the central portion 24 are provided. Due to the central portion 24 and the transmissions 25 and 26, the central case 21 is arranged along the left-right direction in a plan view.

In the central case 21 , an input shaft 27 is supported at the left and right central portions of the rear portion of the central portion 24 so as to protrude rearward. An output shaft 28 and a filter 29 are supported so as to protrude forward from left and right center portions of the front portion of the center portion 24 .

The right support case 22 is connected to the right portion (transmission device 25) of the central case 21, and extends toward the rear side (engine 45 side) (see (engine configuration) described later) in plan view. , and the right drive wheel 15 (see the above-mentioned (Construction of Travel Device)) is supported by the laterally outer portion of the right support case 22 .

The left support case 23 is connected to the left portion (transmission device 26) of the central case 21, and extends toward the rear side (engine 45 side) (see (engine configuration) below) in plan view. , and the left drive wheel 15 (see the above-mentioned (Construction of Travel Device)) is supported by the laterally outer portion of the left support case 23 .

(Connection state between the aircraft and the mission case)
As shown in FIGS. 8-11, a right connecting bracket 13 is connected to a portion of the right track frame 17 between the front and rear lower lateral frames 5, 6 and extends toward the left track frame 17. As shown in FIGS. is served. The right connecting bracket 14 is connected to the right connecting bracket 13 and extends upward.

A left connecting bracket 13 is connected to a portion of the left truck frame 17 between the front and rear lower lateral frames 5 and 6 and extends toward the right truck frame 17 . The left connecting bracket 14 is connected to the left connecting bracket 13 and extends upward.

A right connection bracket 30 is connected to a portion of the right front support frame 9 between the right track frame 17 and the front upper lateral frame 11 and extends rearward. A left connecting bracket 30 is connected to a portion of the left front support frame 9 between the left truck frame 17 and the front upper lateral frame 11 and extends rearward.

In the transmission case 20, the lower portion of the right support case 22 opposite the right drive wheel 15 is connected to the right connection brackets 13 and 14, and the upper portion of the right support case 22 is connected to the right connection. It is connected to bracket 30 .

In the transmission case 20, the lower part of the left support case 23 opposite to the left drive wheel 15 is connected to the left connection brackets 13 and 14, and the upper part of the left support case 23 is connected to the left connection. It is connected to bracket 30 .

In the transmission case 20, the right support case 22 is connected to the right front support frame 9 via the right connection bracket 30, and is connected to the right front support frame 17 via the right connection brackets 13 and 14. It is connected to the rear portion of the frame 9 (the portion between the right front support frame 9 and the right rear support frame 10).

As a result, the right support case 22 moves between the right front support frame 9 and the rear portion of the right truck frame 17 with respect to the right front support frame 9 (the right front support frame 9 and the right rear support frame 10 ). part in between).

In the transmission case 20, the left support case 23 is connected to the left front support frame 9 via the left connection bracket 30, and is connected to the left front support frame 17 via the left connection brackets 13 and 14. It is connected to the rear portion of the frame 9 (the portion between the left front support frame 9 and the left rear support frame 10).

As a result, the left support case 23 moves between the left front support frame 9 and the rear portion of the left truck frame 17 with respect to the left front support frame 9 (the left front support frame 9 and the left rear support frame 10 ). part in between).

In the transmission case 20, the right support case 22 is connected to the right truck frame 17 via right connection brackets 13 and 14, and the left support case 23 is connected to the left truck frame via left connection brackets 13 and 14. 17 , the transmission case 20 is connected across the right track frame 17 and the left track frame 17 .

(Configuration of transmission system inside mission case)
As shown in FIG. 12 , in the transmission case 20 , a transmission shaft 40 is supported in the left-right direction inside the central portion 24 , and a bevel gear 27 a connected to the input shaft 27 and a bevel gear 27 a connected to the transmission shaft 40 . and the bevel gear 40a are meshed with each other.

A transmission shaft 41 is supported in the longitudinal direction inside the central portion 24, and a transmission gear 27b connected to the input shaft 27 and a transmission gear 41a connected to the transmission shaft 41 are in mesh. The transmission shaft 41 is supported concentrically with the output shaft 28 and between the transmission shaft 41 and the output shaft 28 a hydraulically operated working clutch 42 is provided.

The transmissions 25 and 26 are hydrostatic type continuously variable transmissions, and are constructed so as to be capable of steplessly shifting forward and backward. 25 and 26 are connected to hydraulic pumps 25a and 26a.

Inside the right and left support cases 22, 23, a transmission shaft 43 is connected to hydraulic motors 25b, 26b of transmissions 25, 26. As shown in FIG. A transmission shaft 43 and an axle 44 are supported along the left-right direction, and a transmission gear 43a connected to the transmission shaft 43 and a transmission gear 44a connected to the axle 44 are in mesh. Axle 44 protrudes laterally outward from right and left support cases 22 and 23 , and driving wheel 15 is connected to the protruding portion of axle 44 .

With the above configuration, in the transmission case 20, the power transmitted to the input shaft 27 is transferred to the bevel gear of the input shaft 27 as described later (configuration of the transmission system connected across the engine and the transmission case). 27 a and the bevel gear 40 a of the transmission shaft 40 , the power is transmitted to the transmission shaft 40 , and from the transmission shaft 40 to the right and left transmissions 25 and 26 .

In the right and left transmissions 25, 26, power steplessly shifted to the forward side and the reverse side is transmitted to the right and left transmission shafts 43 and axles 44 of the right and left support cases 22, 23. It is transmitted to the driving wheels 15 , and the crawler belts 19 are rotationally driven by the driving wheels 15 .

As shown in FIGS. 1 to 5, right and left operating mechanisms 31 having electric motors 31a are provided, the right operating mechanism 31 being disposed above the right transmission 25, and the left operating mechanism 31 having an electric motor 31a. is located above the left transmission 26 . The electric motors 31a of the right and left operating mechanisms 31 operate trunnion shafts (not shown) of the right and left transmissions 25 and 26, respectively.

The right and left transmissions 25 and 26 are separately shifted to the forward side and the reverse side by the right and left operation mechanisms 31, so that the machine body 1 moves forward and backward, stops, and moves forward and backward. and turn to the left, pivot turn to the right and left, and super pivot turn.

(Engine configuration)
As shown in FIGS. 4, 5 and 8 to 11, a flat engine frame 4 is connected to a rear lower horizontal frame 6 and extends rearward, and an air-cooled single-cylinder engine 45 is mounted. , supported by the engine frame 4 .

As shown in FIGS. 1 to 5, the engine 45 is arranged on the rear side of the transmission case 20, is arranged between the right and left traveling devices 2 in a plan view, and is arranged between the crawler belts 19 in a side view. , and the fourth wheel 16 are overlapped. The engine 45 (crankcase 46) is supported by the engine frame 4 (body 1) so that the rear end of the engine 45 (crankcase 46) is positioned substantially at the same position as the rear end of the crawler belt 19 in side view.

As shown in FIGS. 5 and 12, the output shaft 48 of the engine 45 is arranged at a position lower than the input shaft 27 of the transmission case 20 in a side view, and the engine is arranged so as to protrude toward the transmission case 20. 45 is supported by a crankcase 46 .

As shown in FIGS. 1 to 5 and 12, the output shaft 48 of the engine 45 (crankcase 46) is on the right side with respect to the left-right center A1 (input shaft 27 of the mission case 20) of the airframe 1 in plan view. A crankcase 46 of an engine 45 is supported on the engine frame 4 so as to be offset.

The cylinder 47 of the engine 45 extends upward from the crankcase 46 along the left-right direction in a plan view toward the left-right center A1 (the input shaft 27 of the mission case 20) of the airframe 1. ), and extends to the left beyond the left-right center A1 of the fuselage 1 .

An air cleaner 49 for intake of the engine 45 and a muffler 50 for exhaust of the engine 45 are provided above the cylinder 47 of the engine 45 . A fuel tank 51 of the engine 45 is provided above the crankcase 46 of the engine 45 . An intake port (not shown) for sucking cooling air is provided at the rear portion of the engine 45 (crankcase 46), and a box-shaped dustproof cover 32 made of punching metal is attached to the intake port.

(Configuration of Transmission System Connected Over Engine and Mission Case)
As shown in FIGS. 5 and 12, the gear transmission portion 53 is supported by the crankcase 46 of the engine 45 and extends upward along the vertical direction from the crankcase 46 of the engine 45 in a side view. . The gear transmission portion 53 extends from the crankcase 46 of the engine 45 in the horizontal direction toward the input shaft 27 of the mission case 20 (right-left center A1 of the airframe 1) in a front view (rear view). ) are arranged diagonally.

An input shaft 55 and an output shaft 56 are supported in the front-rear direction inside the gear transmission portion 53 . An input shaft 55 of the gear transmission portion 53 is connected to the output shaft 48 of the engine 45, and a transmission gear 55a connected to the input shaft 55 and a transmission gear 56a connected to the output shaft 56 are in mesh.

The gear transmission is performed so that the output shaft 56 is arranged at the same height as the input shaft 27 of the mission case 20 and arranged at the same position as the input shaft 27 of the mission case 20 in a plan view (left-right center A1 of the airframe 1). The posture of the portion 53 is set.

A transmission shaft 54 is connected across the output shaft 56 of the gear transmission portion 53 and the input shaft 27 of the transmission case 20, and is arranged along the front-rear direction at the left-right center A1 of the airframe 1 in plan view. A channel-shaped cover 52 is attached to the gear transmission portion 53 so as to cover the upper side of the transmission shaft 54 .

With the above configuration, as shown in FIG. 12, the power of the engine 45 is transmitted from the output shaft 48 of the engine 45 to the input shaft 55 of the gear transmission portion 53, and the transmission gear 55a of the input shaft 55 and the output shaft 56 are transmitted. It is reversed via the gear 56a and transmitted to the output shaft 56. The power of the output shaft 56 of the gear transmission portion 53 is transmitted to the input shaft 27 of the transmission case 20 via the transmission shaft 54 .

The power transmitted to the input shaft 27 of the mission case 20 is transmitted to the drive wheels 15 and the mowing device via the transmission system inside the mission case 20 as described above (configuration of the transmission system inside the mission case). 3.

(Construction near the engine)
As shown in FIGS. 2 and 4, a battery frame 33, which is formed by bending a plate material into an angle, is connected to a portion of the lower lateral frame 6 that is laterally adjacent to the engine frame 4 and extends rearward. is served.

A battery 34 is supported by the battery frame 33 , and the battery 34 is supported by the battery frame 33 (body 1 ) so as to be positioned below the cylinders 47 of the engine 45 . In this case, the battery 34 is supported by the battery frame 33 (machine body 1) in a sideways attitude so that the terminal 34a of the battery 34 faces the opposite side of the crankcase 46 of the engine 45. FIG.

As shown in FIGS. 3 and 5, an angle-shaped accelerator frame 35 is connected to the rear lower horizontal frame 6 and extends forward, and a support bracket 35a is connected to the accelerator frame 35 upward. .

An electric motor 36 as an electric actuator and a gear mechanism 61 driven by the electric motor 36 are supported by a support bracket 35 a of the accelerator frame 35 . A wire 37 is connected across the gear mechanism 61 (electric motor 36) and the accelerator portion of the engine 45, and the accelerator portion of the engine 45 is operated by the electric motor 36 via the gear mechanism 61 and the wire 37. .

The electric motor 36 and the gear mechanism 61 are positioned between the transmission case 20 (central case 21) and the engine 45 in the front-rear direction, and between the right and left support cases 22 and 23 of the transmission case 20 in the left-right direction. It is supported by the support bracket 5a (body 1) of the accelerator frame 35 so as to be positioned at .

(Configuration of Mower)
As shown in FIGS. 1, 2 and 3, the mowing device 3 has an upper portion 38 in which a ceiling portion and a rear portion are continuously formed, and lateral side portions 39 connected to the right and left portions of the upper portion 38. provided and contoured. A drum 59 on which a large number of cutting blades 58 are supported is supported across right and left lateral sides 39 so as to be rotatable around an axis extending in the left-right direction. It is

A round pipe-shaped reinforcing frame 57 is connected across the rear ends of the right and left side portions 39 and a bracket 38a connected to the rear portion of the upper portion 38, and the reinforcing frame 57 extends in the left-right direction. It is connected to the rear part of the mowing device 3 along. A flexible rubber plate cover 60 is connected to the front end of the upper portion 38 and hangs downward.

Right and left support brackets 62 are connected to the right and left front portions of the upper portion 38, and the front of the support brackets 62 are provided with fixing pins 62a. The right and left support arms 63 are supported by the support bracket 62 so as to be swingable about an axis P1 along the left-right direction, and the lock member 63a is swingable about an axis P2 along the left-right direction. Possibly supported by a support arm 63 .

Right and left support rods 64 are supported at the ends of support arms 63 , and the mounting position of the support arms 63 on the support rods 64 can be changed along the longitudinal direction of the support rods 64 . A grounding wheel 65 of the caster wheel type, which is a grounding body, is supported at the end of the support rod 64 so as to be freely reorientable.

The state indicated by the solid line in FIG. 1 is a state in which the ground contact wheel 65 has changed its attitude to the ground contact position. It comes out and touches the ground to support the mowing device 3. By hooking the locking member 63a of the support arm 63 to the fixing pin 62a of the support bracket 62, the support arm 63 (grounding ring 65) is held at the grounding position.

In the ground contact position, the ground ring 65 is arranged at substantially the same position as the right end and left end (39) of the mowing device 3, or at a position slightly shifted to the center of the mowing device 3, It is located between the right end and the left end (lateral side 39) of the mowing device 3 .

By removing the lock member 63a of the support arm 63 from the fixing pin 62a of the support bracket 62 and operating the support arm 63 upward and backward around the axis P1, as shown by the two-dot chain lines in FIGS. The ground contact wheel 65 can be repositioned to the retracted position.

At the retracted position, the grounding ring 65 is positioned rearward of the front end portion (cover 60) of the mowing device 3 in a side view. The grounding ring 65 is arranged at a position substantially at the same position as the right end and left end (39) of the mowing device 3 in a plan view, or at a position slightly shifted to the left and right center of the mowing device 3. and the left end (lateral side 39).
As described above, the grounding ring 65 is supported on the upper portion 38 of the mowing device 3 so as to be changeable between the grounding position and the retracted position.

(Configuration of Right and Left Support Arms for Supporting Mowing Device)
As shown in FIGS. 3, 5, 6 and 7, a channel-shaped support bracket 66 and a flat plate-shaped support bracket 67 are mounted on the front lower transverse frame 5 between the right front and left front support frames 9, facing upward. Concatenated. An output portion 68 for outputting the power of the engine 45 is connected to the support brackets 66 and 67 so as to be located below the filter 29 at a position slightly above the front lower horizontal frame 5. .

The output part 68 is provided in the front part of the airframe 1 by means of support brackets 66 and 67 and is supported by the front lower lateral frame 5 . placed in between.

As shown in FIGS. 3, 5, 6, 7 and 9, a support bracket 69 is connected to the upper and lower intermediate portions of the left front support frame 9 . A round pipe-shaped lateral support frame 70 is provided, and the lateral support frame 70 is connected to the left lateral side of the output portion 68 , is connected to a support bracket 69 , and is connected to the left front via the support bracket 69 . It is connected to the support frame 9 . A lateral support frame 70 extends from the left crawler belt 19 to the left laterally outward.

The left support arm 72 is supported on the laterally outer portion of the lateral support frame 70 so as to be vertically swingable about a support axis P3 that passes through the center of the lateral support frame 70 and extends in the left-right direction. The left support arm 72 is arranged slightly laterally outside the left traveling device 2 (crawler belt 19) in a plan view and extends forward. The front end of the left support arm 72 is connected to the left end of the mower 3 (left lateral side 39).

As shown in FIGS. 3, 5, 6, 7 and 8, a support bracket 73 is connected to the upper and lower intermediate portions of the right front support frame 9. As shown in FIGS. A right support arm 71 is supported by a support bracket 73 concentrically with the left support arm 72 so as to be vertically swingable about a support axis P3, and extends forward. The front end of the right support arm 71 is connected to the bracket 38a of the upper portion 38 of the mowing device 3. As shown in FIG.

(Arrangement state of mowing device and right and left support arms)
1, 2, 3, 6, and 7, the support shaft center P3 is aligned with the crawler belt 19 of the traveling device 2 in a side view. , rearward of the front end of the crawler belt 19 of the traveling device 2 , and forward of the driving wheel 15 of the traveling device 2 .

The right support arm 71 is supported by the right front support frame 9 so as to be vertically swingable around the support axis P3, supported by the front portion of the body 1, and extended forward. The right support arm 71 is arranged between the right and left carriages 2 (crawler belts 19) in plan view, and the right carriage 2 is opposite the left support arm 72 in plan view. (crawler belt 19 ) and the output section 68 .

The right support arm 71 is attached to the reinforcing frame 57 via the bracket 38a of the upper part 38 of the mowing device 3, and the right support arm 71 connects the right and left traveling devices 2 (crawler belts) of the mowing device 3. 19), the opposing portion (the bracket 38a of the upper portion 38 of the mowing device 3) is supported. With the above configuration, the mower 3 is supported by the right support arm 71 .

The left support arm 72 is supported by the lateral support frame 70 so as to be capable of swinging up and down around a transmission shaft 77 (see (transmission system configuration inside the output unit) described later) (support shaft core P3). there is The left support arm 72 is supported by the left front support frame 9 via the lateral support frame 70, is supported by the front part of the machine body 1 and extends forward, and in plan view, the left traveling device 2 ( It is arranged slightly laterally outward with respect to the crawler belt 19).

A left support arm 72 is attached to the reinforcing frame 57 via the left lateral side 39 of the mower 3 and supports the left end of the mower 3 . With the configuration described above, the mower 3 is supported by the left support arm 72 .

As shown in FIGS. 1, 3, 6 and 7, a single-acting lift cylinder 74 is provided, the lower part of which is connected to the support bracket 66 so that the lift cylinder 74 is laterally supported in plan view. It is arranged between the right support arm 71 on the opposite side of the frame 70 and the output section 68 .

The upper part of the elevating cylinder 74 is connected to the bracket 57a of the reinforcing frame 57 of the mowing device 3 and attached to the reinforcing frame 57, and the elevating cylinder 74 is connected across the front lower horizontal frame 5 and the mowing device 3. It is
By extending and retracting the elevating cylinder 74, the right and left support arms 71 and 72 are swung up and down about the support axis P3, and the mowing device 3 is operated up and down.

In the state where the mowing device 3 is supported by the right and left support arms 71 and 72 as described above, as shown in FIGS. The right end of the traveling device 2 (crawler belt 19) is arranged at substantially the same position when viewed in the front-rear direction. Alternatively, the right end portion (lateral side portion 39) of the mowing device 3 is arranged slightly laterally to the right and outside the right end portion of the right traveling device 2 (crawler belt 19) in the front-rear direction view.

The left end portion (lateral side portion 39) of the grass cutting device 3 and the left end portion of the left traveling device 2 (crawler belt 19) are arranged at approximately the same position when viewed in the front-rear direction. Alternatively, the left end portion (horizontal side portion 39) of the mowing device 3 is arranged slightly to the left and laterally outside of the left end portion of the left traveling device 2 (crawler belt 19) as viewed in the front-rear direction.

(Structure of transmission system inside output unit)
As shown in FIGS. 5, 6, 7 and 12, in the output portion 68, a cylindrical input shaft 75 is supported in the rear portion of the output portion 68 along the front-rear direction. The output shaft 28 of the mission case 20 is inserted into the input shaft 75, and the input shaft 75 and the output shaft 28 are connected by a spline structure.

A relay shaft 76, which is a transmission portion, is supported inside the output portion 68 along the left-right direction, and a bevel gear 75a of the input shaft 75 and a bevel gear 76a of the relay shaft 76 are engaged with each other. The transmission shaft 77 is arranged along the horizontal direction at a position higher than the input shaft 75 and the relay shaft 76, and the transmission gear 76b of the relay shaft 76 and the transmission gear 77a of the transmission shaft 77 are engaged. A transmission shaft 77 extends from the output portion 68 through the interior of the lateral support frame 70 toward the left support arm 72, and is supported by the lateral support frame 70 concentrically with the support axis P3. .

As described above (the configuration of the transmission system inside the transmission case) and as shown in FIG. It is transmitted to the input shaft 75 of the output portion 68 via the output shaft 28 .

As shown in Figs. and transmitted to the transmission shaft 77 via the transmission gear 77 a of the transmission shaft 77 .

(Structure of transmission mechanism for transmitting power from the output unit to the mowing device)
A belt-type transmission 78 is supported on the left support arm 72, as shown in FIGS.

The transmission mechanism 78 includes a drive pulley 79 which is a driving rotating body attached to the left end of the transmission shaft 77, a driven pulley 80 which is a driven rotating body attached to the driving shaft 59a of the drum 59 of the mower 3, and a driving pulley 80. It has a transmission belt 81 which is an endless rotating body attached to a pulley 79 and a driven pulley 80 .

Further, the transmission mechanism 78 has a tension pulley 82, which is a tension rotating body capable of tensioning the transmission belt 81, and a support member 83 and a spring 84, which will be described later. It has a cover 85 that covers the belt 81 and the like.

An arm-shaped support member 83 is supported on the left end of the horizontal support frame 70 so as to be able to swing vertically, and the support member 83 is supported so as to be able to swing vertically around the transmission shaft 77 (support shaft center P3). It is

A tension pulley 82 is rotatably supported by a support member 83 and arranged below the transmission belt 81 . A spring 84 is provided to urge the support member 83 upward, the tension pulley 82 is pressed against the transmission belt 81, and the transmission belt 81 is operated in a tensioned state.

As described above (configuration of the transmission system inside the output section), the power transmitted to the transmission shaft 77 is transmitted to the transmission mechanism 78 via the drive pulley 79, the transmission belt 81, and the driven pulley 80, and the grass is cut. It is transmitted to the device 3 (driving shaft 59a of the drum 59), and in the mowing device 3, the drum 59 and the cutting blade 58 are rotationally driven counterclockwise in FIG.

With the above configuration, the transmission mechanism 78 is supported by the left support arm 72 and connected across the transmission shaft 77 and the mower 3 , and the drive pulley 79 is connected to the left end of the transmission shaft 77 . , the transmission shaft 77 is connected to the transmission mechanism 78 . By attaching the driven pulley 80 to the drive shaft 59 a of the drum 59 of the mowing device 3 , the driven pulley 80 is provided in the mowing device 3 .

In the transmission mechanism 78 , the drive pulley 79 , the driven pulley 80 , the transmission belt 81 , the tension pulley 82 , and the cover 85 are arranged on the left laterally outside of the left support arm 72 in plan view. is supported laterally outward on the left with respect to the left support arm 72 .

(Remote control of work vehicle)
A control device (not shown), a receiver (not shown), and elevation control for supplying and discharging working oil to and from the elevation cylinder 74 (refer to the above-described arrangement of the mowing device and the right and left support arms). A valve (not shown), a work control valve (not shown) for supplying and discharging working oil to and from the work clutch 42 (see the above-mentioned (transmission system configuration inside the transmission case)), etc. are provided in the machine body 1. It is

An operation signal of a transmitter (not shown) operated by an operator is transmitted to a receiver, and the control device operates the elevation control valve and the work control valve to operate the mowing device 3 by the elevation cylinder 74 and perform the work. The mowing device 3 is operated and stopped by the clutch 42 .

An operation signal of the transmitter operated by the operator is transmitted to the receiver, and the control device operates the electric motors 31a of the right and left operation mechanisms 31 (see the above-mentioned (configuration of the transmission system inside the mission case)). Then, the transmissions 25 and 26 are operated to change gears.

The right transmission 25 and the left transmission 26 are separately operated to the forward side and the reverse side, so that the machine body 1 can move forward and backward, stop, turn to the right and left in forward and backward, and turn to the right. And a pivot turn to the left and a super pivot turn are performed.

(First alternative embodiment of the invention)
The structure for the right and left support arms 71, 72 may be reversed as described below.

A lateral support frame 70 (transmission shaft 77) extends laterally outward on the right side from the output portion 68, is supported by the support frame 9 on the front right side, and faces the right traveling device 2 (crawler belt 19) with the upper side on the right side. laterally outward.

A right support arm 71 is supported by a lateral support frame 70 so as to be vertically swingable about a support axis P3, and is supported by the right front support frame 9 via the lateral support frame 70. , and is arranged laterally outside the right traveling device 2 (crawler belt 19) in a plan view. A right support arm 71 is attached to the reinforcing frame 57 via the right lateral side 39 of the mower 3 and supports the right end of the mower 3 .

The left support arm 72 is supported by the left front support frame 9 so as to be vertically swingable about the support axis P3, supported by the front part of the machine body 1, and extended forward. The left support arm 72 is arranged between the right and left running devices 2 (crawler belts 19) in plan view, and the left running device 2 (crawler belt 19) is opposite the right support arm 71 in plan view. It is arranged between the belt 19 ) and the output section 68 .
A left support arm 72 is attached to the reinforcing frame 57 to support the opposing portion of the mower 3 between the right and left traveling devices 2 (crawler belts 19).

A lift cylinder 74 is disposed between the left support arm 72 opposite the lateral support frame 70 and the output portion 68 in plan view.
The transmission mechanism 78 is arranged on the right laterally outer side with respect to the right support arm 71 in a plan view, and the transmission mechanism 78 is supported on the right laterally outer side with respect to the right support arm 71 .

(Second alternative embodiment of the invention)
The support shaft center P3 is arranged between the upper part of the crawler belt 19 of the traveling device 2 and the track frame 17 in a side view, and is arranged on the rear side with respect to the front end portion of the crawler belt 19 of the traveling device 2, so that the traveling It may be configured to be arranged on the front side with respect to the drive wheels 15 of the device 2 .
According to this configuration, the lateral support frame 70 passes between the upper portion of the crawler belt 19 of the traveling device 2 and the track frame 17 and extends laterally outward to the left (right).

(Third alternative embodiment of the invention)
Instead of the crawler type traveling device 2, a multi-wheel type traveling device 2 such as four wheels on one side may be employed.

(Fourth alternative embodiment of the invention)
The transmission mechanism 78 includes a driving sprocket (not shown) as a driving rotating body, a driven sprocket (not shown) as a driven rotating body, a transmission chain (not shown) as an endless rotating body, and a tension rotating body. It may be configured in a transmission chain type having

(Fifth alternative embodiment of the invention)
Instead of the engine 45, an electric motor (not shown) may be used as the prime mover.
In the output portion 68, a transmission chain (not shown) may be employed as a transmission portion in place of the relay shaft 76.
In the grass cutting device 3, a sled-like member (not shown) may be employed as the grounding member instead of the grounding wheel 65.

The present invention can also be applied to a work vehicle equipped with other work devices such as a snow removal device (not shown) or a rotary tillage device (not shown) in place of the mowing device 3. It can be applied not only to cars but also to work vehicles driven by workers.

1 machine body 2 traveling device 3 mowing device (working device)
15 Drive wheel 16 Roller wheel 17 Track frame 19 Crawler belt 38 Upper part of lawn mower 45 Engine (motor part)
57 Reinforcing frame 65 Grounding ring (grounding body)
68 output part 71 support arm 72 support arm 74 lifting cylinder 75 input shaft 76 intermediate shaft (transmission part)
77 transmission shaft 78 transmission mechanism 79 driving pulley (driving rotating body)
80 driven pulley (driven rotating body)
81 transmission belt (endless rotating body)
82 tension pulley (tension rotating body)
83 support member P3 support shaft center

Claims (12)

right and left carriages supporting the airframe;
right and left support arms that are supported on the front part of the fuselage and extend forward so as to be able to swing up and down about a support axis extending in the left-right direction;
a working device supported by the right and left support arms;
one of the right and left support arms is disposed between the right and left travel devices in a plan view to support a portion of the work device that faces between the right and left travel devices;
the other of the right and left support arms is arranged laterally outwardly with respect to the right or left travel device in a plan view, and supports the right end or left end of the working device;
A work vehicle in which a transmission mechanism for transmitting power of a driving unit provided in the machine body to the work device is supported by the other of the right and left support arms. 2. The work vehicle according to claim 1, wherein said support shaft is arranged above said travel device and rearward with respect to a front end portion of said travel device in a side view. The traveling device includes a track frame arranged along the front-rear direction, a plurality of rollers supported by the track frame, a driving wheel arranged above a front-rear intermediate portion of the track frame, and the It has a drive wheel and a crawler belt attached to the wheel,
3. The working vehicle according to claim 2, wherein the support shaft is arranged on the front side with respect to the driving wheels and on the upper side with respect to the crawler belt in a side view. an output unit provided in the front part of the fuselage for outputting the power of the driving unit;
a transmission shaft extending from the output portion toward the other of the right and left support arms and connected to the transmission mechanism,
The working vehicle according to any one of claims 1 to 3, wherein the power of the driving portion is transmitted to the working device via the output portion, the transmission shaft, and the transmission mechanism. the transmission shaft is arranged at a position higher than the input shaft that receives the power of the driving portion in the output portion;
5. The working vehicle according to claim 4, wherein a transmission portion for transmitting power of said input shaft to said transmission shaft is provided in said output portion. The transmission mechanism includes a drive rotator attached to the transmission shaft, a driven rotator provided in the work device for driving the work device, and an endless rotator attached to the drive rotator and the driven rotator. and a tension rotating body capable of operating the endless rotating body in a tensioned state,
6. The work vehicle according to claim 4, further comprising a supporting member that is swingably supported around the transmission shaft, and wherein the tension rotating body is supported by the supporting member. One of the right and left support arms is arranged between the traveling device on the opposite side of the other right and left support arms and the output section in plan view. The work vehicle according to any one of the items. A lifting cylinder capable of lifting and lowering the working device is provided,
8. The work vehicle according to claim 7, wherein the elevating cylinder is arranged between one of the right and left support arms and the output section in plan view. A reinforcing frame connected to the working device along the left-right direction is provided,
A work vehicle according to any preceding claim, wherein the right and left support arms are attached to the reinforcing frame. A lifting cylinder capable of lifting and lowering the working device is provided,
10. The work vehicle of claim 9, wherein said lifting cylinder is attached to said reinforcing frame. a right end portion of the working device and a right end portion of the right traveling device are arranged at approximately the same position when viewed in the front-rear direction;
a left end portion of the working device and a left end portion of the left traveling device are arranged at substantially the same position when viewed in the front-rear direction;
A work vehicle according to any one of claims 1 to 10, wherein the transmission mechanism is laterally outwardly supported with respect to the other of the right and left support arms. a grounding body supported on the upper part of the working device so as to be changeable between a grounding position and a retracted position;
In the ground position, the ground body extends forward and downward from the upper portion of the working device and grounds the ground to support the working device;
In the retracted position, the grounding member is positioned rearward of the front end of the working device in a side view, and positioned between the right end and the left end of the working device in a plan view. 12. The work vehicle according to any one of claims 1 to 11, wherein the work vehicle is arranged above the work device.

Images