JP4598192B2 - Construction machinery - Google Patents

Description

The present invention relates to a construction machine such as a hydraulic excavator and a hydraulic crane, for example. In particular, a driver's seat and the like are inclined obliquely upward together with a floor member with respect to a frame so that maintenance work and the like under the floor can be easily performed. It relates to the construction machine.

  In general, a hydraulic excavator as a construction machine is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a vertical swinging motion provided on the front side of the upper revolving body. And a work device.

  Further, the upper swing body includes a swing frame, an engine mounted on the rear side of the swing frame, a counterweight located on the rear side of the engine and attached to a rear end portion of the swing frame, and the engine And a building such as a canopy or a cab that is provided on the revolving frame and that covers a driver's seat on which the operator sits at least from above.

  Here, the hydraulic excavator includes a small excavator called a mini excavator suitable for excavation work in a narrow work site. Further, in such a small hydraulic excavator, for example, a structure in which a space for installing hydraulic equipment such as a control valve and a swing motor is secured below the floor member (under the floor) in order to make the swing frame as small as possible. It is said.

  When performing maintenance work such as maintenance and inspection on equipment such as control valves and engines installed on the lower side of the floor member, the floor should be lifted diagonally upward with the front side of the floor member as a support point. A structure in which a member is tilted (tilt up, tilt down) is known (see, for example, Patent Documents 1, 2, and 3).

JP-A-6-320962 JP 2000-72048 A International Publication No. WO2005 / 25968 Pamphlet

  In this case, between the front side position of the swivel frame and the front side position of the floor member, the floor member is supported so as to be tiltable forward and rearward together with the driver's seat etc. with the front side of the floor member as a support point. A front support is provided. In addition, a tilting mechanism (tilt mechanism) is provided below the floor member, and the tilting mechanism is operated to tilt the floor member diagonally upward with the floor front support portion as a support point. It is configured to rotate.

  Further, as another conventional technique, an exhaust pipe such as an exhaust pipe provided in an engine of a work vehicle is provided to extend outside a machine room (engine room), and an extended portion (chimney portion) of the exhaust pipe is provided as a cab of the vehicle or There is also known a configuration that extends upward along a rear support column such as a canopy and exhausts engine exhaust gas from its upper end to the outside (see, for example, Patent Documents 4 and 5).

JP 2000-73404 A Japanese Patent Laid-Open No. 11-256616

  By the way, in the work vehicle according to the other conventional techniques described above (for example, Patent Documents 4 and 5), the chimney portion of the exhaust pipe extends upward along the rear column such as the cab or canopy outside the engine room, and the upper end portion thereof. Because the exhaust gas from the engine is discharged to the outside, the exhaust gas does not enter the driver's seat side of the vehicle and the operator's living environment in the cab or canopy can be maintained well There is.

  However, as in the prior art described in Patent Documents 1, 2, and 3, in a small construction machine in which the floor member is tilted upward together with a building such as a cab or a canopy, the exhaust pipe of the engine is connected to the machine room. The following problems occur when the configuration extends upward along the cab or canopy to the outside of the (engine room).

  That is, in order to tilt the cab or canopy building together with the floor member obliquely upward during maintenance work, it is necessary to provide the exhaust pipe chimney part separately from the building, and the exhaust pipe chimney part etc. There is a problem that it is difficult to support it stably above the frame of the construction machine.

  In addition, when a special support means is provided to support the chimney portion of the exhaust pipe above the frame, this not only increases the number of parts, but also requires extra work for the assembly work. There is.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is, for example, when an exhaust pipe is detachably connected at an outer position of a machine room (engine room), for example, during maintenance work on the lower floor side. It is an object of the present invention to provide a construction machine in which a part of an exhaust pipe can be tilted together with a building so that maintenance and inspection work of an engine and the like can be easily performed.

  Another object of the present invention is to suppress the propagation of vibrations of different modes between exhaust pipes divided into two parts, for example, upper and lower, and to improve vibration resistance and ensure sufficient strength. It is to provide a construction machine that can be used.

  Another object of the present invention is to extend a part of the exhaust pipe (chimney part) upward along the building, so that the heat of the exhaust gas etc. can be prevented from being transmitted to the driver's seat side. An object of the present invention is to provide a construction machine capable of maintaining a good living environment.

In order to solve the above-described problems, the present invention provides a frame in which a working device is provided on the front side, an engine mounted on the rear side of the frame, an exhaust device that exhausts exhaust gas from the engine to the outside, A counterweight located on the rear end side of the frame located on the rear side of the engine , an exterior cover provided on the frame so as to surround the engine from the outside between the counterweight, and A floor member located on the front side of the engine and provided on the frame and capable of being tilted up and down with the front side as a supporting point, and an operator provided on the floor member for operating the engine and the work device The present invention is applied to a construction machine including a building that covers at least the driver's seat on which the car sits.

A feature of the configuration adopted by the invention of claim 1 is that the exhaust device is located at a position where one side is located on the frame and connected to the exhaust port side of the engine and the other side is exposed to the outside from the exterior cover. a fixed-side exhaust pipe attached with fixedly disposed on the counterweight, the outer front SL provided in the building for discharging exhaust gas from the engine to the outside on the other side of the fixed-side exhaust pipe The movable side exhaust pipe is detachably connected to the outside of the cover and extends upward along the building. The movable side exhaust pipe tilts the floor member together with the building in a direction away from the counterweight. In the configuration, the upper side is separated and lifted upward from the fixed side exhaust pipe .

  According to a second aspect of the present invention, a connecting portion between the fixed side exhaust pipe and the movable side exhaust pipe is disposed at a position exposed to the outside from the exterior cover at a rear position of the building, and the fixed side exhaust pipe To prevent the vibration from being transmitted to the movable exhaust pipe.

  According to a third aspect of the present invention, in the connecting portion between the fixed-side exhaust pipe and the movable-side exhaust pipe, the exhaust gas flowing through the fixed-side exhaust pipe is used to cool the movable-side exhaust pipe. It is set as the structure which forms the external air introduction hole which introduces the external air for use.

  On the other hand, according to the invention of claim 4, the fixed side exhaust pipe and the movable side exhaust pipe are each configured to be covered from the outside by the protective cover.

  According to the invention of claim 5, the frame is a turning frame of an upper turning body that is turnably provided on the lower traveling body, and the protective cover is divided into a plurality of parts divided in the radial direction of the exhaust pipe. The divided covers are provided, and a gap is provided between the divided covers in the turning direction of the swivel frame for circulating cooling air from the outside.

  According to a sixth aspect of the present invention, the movable exhaust pipe is configured such that an opening end that opens the exhaust gas to the outside air is arranged at a height position corresponding to the upper surface of the building.

As described above, according to the first aspect of the present invention, the exhaust device for exhausting the exhaust gas from the engine mounted on the rear side of the frame to the outside, the exhaust port of the engine with one side positioned on the frame. for discharging the fixed-side exhaust pipe attached to the other side is connected to the side is fixed before Kigai instrumentation cover Rutotomoni counterweight disposed position exposed to the outside, the exhaust gas from the previous SL engine to the outside provided in the building is constituted by a movable-side exhaust pipe that extends upwardly along the building of the like outwardly is detachably connected canopy or cab of the exterior cover on the other side of the fixed-side exhaust pipe since the building of when tilting (tilting up) obliquely upward along the floor member, you can tilt up the movable-side exhaust pipe to the floor member and integrally movable side exhaust It can be separated by lifting upwardly a type from the fixed-side exhaust pipe. And machinery, such as an engine arrange | positioned under the floor (under the floor member), can be easily maintained (maintenance and inspection) in a tilted-up state.

  Since the movable side exhaust pipe is attached to the building (and floor member), the movable side exhaust pipe is stabilized by the building (and floor member) without providing any special support means on the frame of the construction machine. And the number of parts can be prevented from increasing, and the workability during assembly can be improved. In addition, for example, when the construction member is operated (tilted down) by placing the floor member side on the frame (tilt down), the movable side exhaust pipe can be kept connected to the fixed side exhaust pipe on the rear side of the floor member. In this state, the exhaust gas from the engine can be discharged to the outside of the building or the like via the fixed side exhaust pipe and the movable side exhaust pipe. As a result, the exhaust gas from the engine can be prevented from entering the driver's seat and entering, and the living environment of the operator in the building can be kept good, and the driving operability in the building can be improved. , Can improve the reliability as a construction machine.

  According to the second aspect of the present invention, the connecting portion between the fixed side exhaust pipe and the movable side exhaust pipe is disposed at a position exposed to the outside from the exterior cover at a rear position of the building, and Since the vibration is prevented from being transmitted to the movable exhaust pipe, for example, it is possible to prevent the vibration from propagating from the fixed exhaust pipe to the movable exhaust pipe (or from the movable exhaust pipe to the fixed exhaust pipe). The vibration resistance of each exhaust pipe can be improved, and sufficient strength against vibrations of the exhaust pipe can be secured.

  In the invention described in claim 3, since the outside air introduction hole is formed in the connection portion between the fixed side exhaust pipe and the movable side exhaust pipe, the exhaust gas discharged from the engine into the fixed side exhaust pipe. Can be used to draw cooling air (outside air) into the movable side exhaust pipe from the outside of the exterior cover, and the temperature rise of the movable side exhaust pipe extending upward along the building It can be suppressed by the air flow from the introduction hole. For this reason, while being able to reduce the temperature of a movable side exhaust pipe, the temperature rise in the said building can also be suppressed low.

  On the other hand, since the invention according to claim 4 is configured to cover the fixed side exhaust pipe and the movable side exhaust pipe from the outside by the protective covers, respectively, the other side of the fixed side exhaust pipe and the movable side exhaust pipe are externally provided. Even if it is placed outside the cover, it can be insulated by covering these exposed parts with a protective cover, and the surrounding workers can be thermally treated from the heat of the exhaust gas flowing through each exhaust pipe. Can be protected.

  According to the fifth aspect of the present invention, the protective cover is constituted by a plurality of divided covers that are divided in the radial direction of the exhaust pipe, and is arranged between the divided covers in the turning direction of the turning frame. Since a gap is provided to allow cooling air to flow from the inside of the split cover (protective cover) due to the gap between the split covers arranged in the turning direction when the upper swing body is swiveled on the lower traveling body. Cooling air can be efficiently circulated to the exhaust pipe, and the exhaust pipe can be cooled from the outside by this cooling air.

  Furthermore, the invention according to claim 6 is configured such that the opening end of the movable exhaust pipe that releases the exhaust gas to the outside air is disposed at a height position corresponding to the upper surface of the building. It is possible to suppress the exhaust gas discharged from the air from entering and entering the operator, and to maintain a good living environment for the operator. In addition, by disposing the movable exhaust pipe at a position that is equal to or slightly lower than the upper end of the building, the movable exhaust pipe does not protrude upward during transportation of construction machinery, etc. Can be done.

  Hereinafter, a construction machine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where the construction machine is applied to a small offset boom type hydraulic excavator.

  Here, FIG. 1 to FIG. 11 show a first embodiment of the present invention. In the drawing, reference numeral 1 denotes a canopy-type hydraulic excavator as a construction machine. The hydraulic excavator 1 is a self-propelled crawler-type lower traveling body 2 and an upper swing that is mounted on the lower traveling body 2 so as to be able to pivot. The body 3 is constituted.

  The upper swing body 3 includes a swing frame 5, a counterweight 7, an exterior cover 8, a machine room 9, an engine 10, a floor member 19, a floor front support portion 20, a tilt mechanism 21, a driver seat 23, a canopy 26, and the like, which will be described later. It is comprised by. In this case, the floor member 19 of the upper swing body 3 is tilted together with the canopy 26 and the like (tilt up and tilt down in the directions of arrows A and B in FIG. 11). Further, the upper swing body 3 is driven to rotate in the direction of arrow C around the rotation center O in FIG.

  Reference numeral 4 denotes an offset boom type working device provided at the front portion of the upper swing body 3 so as to be able to move up and down. The working device 4 includes a lower boom 4A, an upper boom 4B, an arm support member 4C, an arm 4D, and a bucket as a work tool. 4E or the like. Then, the working device 4 performs excavation work such as earth and sand by rotating the arm 4D and the bucket 4E while moving the lower boom 4A up and down.

  Further, the work device 4 translates (offsets) the upper boom 4B, the arm support member 4C, the arm 4D, and the bucket 4E in the left and right directions on the distal end side of the lower boom 4A when performing excavation work such as side grooving, for example. In this offset state, the lower boom 4A is moved up and down, and the arm 4D and the bucket 4E are rotated to dig a side groove or the like.

  Reference numeral 5 denotes a revolving frame constituting a frame of the upper revolving structure 3, and this revolving frame 5 is formed in a flat plate shape using a steel plate or the like as shown in FIG. A bottom plate 5A extending in the direction, left and right vertical plates 5B and 5C standing on the bottom plate 5A and facing forward and rearward in the left and right directions, and the vertical plates 5B and 5C. It is constituted by a horizontal plate 5D and the like that are positioned on the rear end side and are erected on the bottom plate 5A and extend in the left and right directions. And between the left and right vertical plates 5B and 5C, the base end side of the lower boom 4A (working device 4) is attached so as to be able to move up and down.

  Further, the revolving frame 5 is located on the front end side of the vertical plates 5B and 5C and extends in the left and right directions and extends in the left and right directions at the rear positions of the vertical plates 5B and 5C. The left guard member 5L attached to the left side of the bottom plate 5A via the front beam 5E, the middle beam 5G, etc., and the right side of the bottom plate 5A via the front beam 5F, the middle beam 5H, etc. And a right guard member 5R.

  Here, the left guard member 5L and the right guard member 5R of the revolving frame 5 are formed to be curved in an arc shape substantially corresponding to a counterweight 7 described later by using, for example, a hollow pipe material or the like. The turning frame 5 is centered on the turning center O within a circle having a turning radius R substantially corresponding to the vehicle width of the lower traveling body 2 in order to realize a small turning type frame structure used for the offset boom type hydraulic excavator 1. As a turning operation.

  Reference numeral 6 denotes a mounting seat provided on the upper side of the revolving frame 5. The mounting seat 6 is disposed, for example, on the upper side of the front beam 5E located on the left side and extends in the left and right directions. Then, a floor front support portion 20 of a floor member 19 to be described later is attached to the mounting seat 6, whereby the floor member 19 is tilted up and down in the directions indicated by arrows A and B illustrated in FIG. 11. It is.

  Reference numeral 7 denotes a counterweight provided on the rear end side of the swing frame 5, and the counterweight 7 is positioned on the rear side of the engine 10 to be described later and can be attached to and detached from the swing frame 5 as shown in FIGS. 1 to 5. It attaches and balances the weight of the upper swing body 3 with respect to the work device 4 on the front side.

  The counterweight 7 is formed in an arc shape along a circle having a turning radius R with respect to the turning center O of the upper turning body 3 as shown in FIGS. 2 and 5, and has a convex curve in the left and right directions. It extends. The counterweight 7 is housed in a circle having a turning radius R that substantially corresponds to the vehicle width of the lower traveling body 2. For this purpose, the engine 10 described later has a partition plate 19D (floor member 19) shown in FIG. It is arranged in the front side so as to enter the lower side.

  Further, as shown in FIG. 3, the counterweight 7 is formed with a substantially rectangular inspection opening 7A located at the center of the rear surface, and this inspection opening 7A is opened by an engine cover 8A described later. It is covered so that it can be closed. When the engine cover 8A is opened, maintenance, inspection, and the like of an air cleaner 11 (engine 10), which will be described later, are performed from the rear surface side of the counterweight 7 through the inspection opening 7A.

  8 is an exterior cover provided on the revolving frame 5, and the exterior cover 8 is disposed on the revolving frame 5 so as to surround a floor member 19 (canopy 26), which will be described later, from the periphery as shown in FIGS. It is arranged to improve the appearance shape (designability) of the upper swing body 3 and to efficiently perform, for example, a cleaning operation performed after the excavation operation is completed.

  As shown in FIG. 3, the exterior cover 8 is located at the center of the rear portion of the upper swing body 3 and covers the inspection opening 7A of the counterweight 7 so that it can be opened and closed, and the counterweight 7 (engine cover 8A). A left side cover 8B that curves and extends forward from the left end side, a right side cover 8C that curves and extends forward from the right end side of the counterweight 7 (engine cover 8A), and the like.

  Here, the exterior cover 8 forms, for example, a machine room 9 for accommodating an engine 10 described later between the horizontal plate 5D of the revolving frame 5 and the counterweight 7 shown in FIG. The upper side of the machine room 9 is covered with a partition plate 19D and a rear mounting plate 19E of a floor member 19 described later so as to be openable and closable (tilt up and down are possible).

  Further, as shown in FIGS. 2 and 3, the right side cover 8C of the exterior cover 8 is disposed at a right side position of a canopy 26 described later, and a tank cover 8D is attached to the right side cover 8C so as to be opened and closed. . The tank cover 8D covers, for example, the hydraulic oil tank 14 and the fuel tank 15 (see FIG. 5) from the upper side. In addition, an opening (not shown) for projecting (exposing) a rising pipe portion 29D of a fixed exhaust pipe 29, which will be described later, is formed on the rear side of the left side cover 8B.

  Reference numeral 10 denotes an engine mounted on the rear side of the revolving frame 5. The engine 10 is installed in the machine room 9 on the rear side of the horizontal plate 5 </ b> D as shown in FIG. , Which extends to the right. The engine 10 housed in the machine room 9 is disposed so that the upper part thereof is covered by a partition plate 19D (see FIG. 11) of a floor member 19 described later and enters the lower side of the partition plate 19D. It is.

  As a result, the engine 10 can be installed in the front of the revolving frame 5 together with the counterweight 7 and the like, and the upper revolving body 3 can be reduced in size by effectively using the installation space of the entire revolving frame 5. is there. Further, an air cleaner 11 for cleaning the intake air is provided on the suction side of the engine 10 as shown in FIG.

  On the other hand, on the exhaust side of the engine 10, an exhaust muffler 28, a fixed-side exhaust pipe 29, etc., which will be described later, are provided on the left side of the engine 10 as shown in FIG. A hydraulic pump 12 that is driven by the engine 10 is provided on the left side of the engine 10 so as to be positioned below the exhaust muffler 28 described later. A heat exchanger 13 such as a radiator or an oil cooler is disposed on the right side of the engine 10. A hydraulic oil tank 14 is provided on the right side of the swivel frame 5 on the front side of the heat exchanger 13, and a fuel tank 15 is provided on the front side of the hydraulic oil tank 14.

  Reference numeral 16 denotes a control valve provided on the left side of the revolving frame 5, and the control valve 16 is a multiple valve including a plurality of directional control valves, and is located on the lower side (under the floor) of a floor member 19 described later. It is installed on the under cover of the revolving frame 5 or the like. Then, the control valve 16 supplies and discharges the hydraulic oil discharged from the hydraulic pump 12 to hydraulic actuators such as the cylinders of the working device 4, the turning hydraulic motor, and the traveling hydraulic motor (all not shown). In some cases, the flow rate and the supply / discharge direction of the pressure oil supplied and discharged individually for each hydraulic actuator are controlled.

  Reference numeral 17 denotes a floor support member provided on the rear side of the swing frame 5 so as to straddle the engine 10 from above. The floor support member 17 constitutes a part of the swing frame 5, and a canopy 26 described later is connected to the floor member 19. The rear mounting plate 19E and the like are supported from below. The floor support member 17 is positioned above the engine 10 and extends left and right as shown in FIGS. 5 to 7, and a support base 17A on which a rear mounting plate 19E of a floor member 19 described later is placed. And a left front strut 17B, a left rear strut 17C, a right front strut 17D, a right rear strut 17E and the like that support the support base 17A at a position above the engine 10.

  Further, among these support columns 17B to 17E, the left front support column 17B extends forward and downward from the left end portion of the support base 17A, and the left rear support column 17C extends downward from the left end portion of the support base 17A. The right front column 17D extends downward from the right end of the support base 17A, and the right rear column 17E extends downward from the right end of the support base 17A. And the lower end part of each support | pillar 17B, 17C, 17D, 17E is being fixed and attached to the turning frame 5, respectively.

  Moreover, the right front support | pillar 17D is located in the right side rather than the below-mentioned floor member 19, and is bent in the substantially L shape so that the heat exchanger 13 may not be obstruct | occluded. A tilt mechanism 21 to be described later is swingably attached to an intermediate portion in the length direction of the right front support column 17D via a mounting bracket 22 shown in FIG.

  Reference numeral 18 denotes a mounting table provided on the support base 17A of the floor support member 17. The mounting table 18 is provided on the support base 17A with a vibration isolating material (not shown) or the like as shown in FIGS. The rear mounting plate 19E, which will be described later together with the floor supporting member 17, is supported from the lower side. That is, the rear mounting plate 19E of the floor member 19 is mounted on the mounting table 18 at the time of tilt down, and the rear mounting plate 19E is detachably fixed on the mounting table 18 using bolts or the like. Is.

  Reference numeral 19 denotes a floor member provided on the revolving frame 5 so as to be tiltable. The floor member 19 is arranged in the left and right directions on the revolving frame 5 so as to cover the control valve 16 and the like illustrated in FIG. It is arranged to be shifted to one side (left side of the vertical plates 5B and 5C when viewed from the rear of the vehicle). A driver seat 23 and a canopy 26 described later are mounted on the floor member 19.

  Here, the floor member 19 includes a footrest plate 19A (see FIG. 7) that serves as a footrest for an operator seated in a driver seat 23, which will be described later, and a travel lever, which will be described later, provided on the front side of the footrest plate 19A. A partition plate 19D having a front mounting plate 19B to which the pedal 25 and the like are mounted, a driver seat base 19C provided on the rear side of the footrest plate 19A and supporting the driver seat 23 from below, and an upper end side of the partition plate 19D The rear mounting plate 19E and the like provided on the main body are roughly configured.

  The partition plate 19D of the floor member 19 extends obliquely upward and obliquely upward as shown in FIGS. 7, 8, and 11, and partially covers the machine chamber 9. The rear mounting plate 19E is integrally formed so as to extend substantially horizontally from the upper end side of the partition plate 19D to the rear, and the rear mounting plate 19E has a right rear pillar 26D and a left rear pillar of a canopy 26 described later. A pillar 26E is fixedly provided.

  In this case, the rear mounting plate 19E of the floor member 19 is placed on the support base 17A of the floor support member 17 via the mounting table 18 or the like with the floor member 19 tilted down as shown in FIG. In this state, it is detachably fixed on the mounting table 18 using a bolt (not shown) or the like. When the floor member 19, the canopy 26, etc. are tilted up in the direction of arrow A shown in FIG. 11, these bolts are removed in advance by manual work or the like.

  Reference numeral 20 denotes a floor front support portion provided between the revolving frame 5 and the floor member 19, and the front floor support portion 20 is arranged between the front side position of the revolving frame 5 and the floor member 19 as shown in FIGS. 1 and 11. Provided between the front side mounting plate 19B (see FIG. 7) and the front side of the floor member 19 as a supporting point (rotation fulcrum), the floor member 19 is moved obliquely upward together with a canopy 26 described later (indicated by an arrow in FIG. 11). (A and B directions) are supported so as to be tiltable.

  That is, the floor front support portion 20 is connected to the mounting seat 6 (see FIG. 5) provided at the front position of the revolving frame 5 so that the front end portion of the floor member 19 can be rotated using a connecting pin or the like. The floor member 19 allows the floor member 19 to tilt obliquely forward (in the direction of arrow A in FIG. 11) with the floor front support portion 20 as a support point. At this time, the rear side of the floor member 19 is lifted obliquely upward, and so-called tilt-up is performed.

  When the floor member 19 is tilted down in the direction indicated by arrow B in FIG. 11, the rear side (rear mounting plate 19E) of the floor member 19 is tilted obliquely downward, and the rear mounting plate 19E of the floor member 19 is tilted downward. Is mounted on the support base 17A of the floor support member 17 through the mounting table 18 as described above.

  Reference numeral 21 denotes a tilting mechanism (hereinafter referred to as a tilt mechanism 21) located between the revolving frame 5 and the floor member 19 and positioned on the rear side of the floor front support portion 20. The tilt mechanism 21 includes the above-described tilt mechanism 21. It is configured in substantially the same manner as the tilting mechanism proposed by the present applicant in Patent Document 3 (International Publication No. WO2005 / 25968 pamphlet), and the right side position of the floor member 19 is moved forward and backward along the side surface of the canopy 26 and the like. It is extended and arranged. The tilt mechanism 21 tilts and drives the floor member 19 obliquely upward (in the directions indicated by arrows A and B in FIG. 11) with the front floor support portion 20 as a support point.

  Here, as shown in FIGS. 6 and 11, one side of the tilt mechanism 21 is swingably attached to the right front column 17D of the floor support member 17 via a mounting bracket 22 or the like, and the other side is the floor member 19 side. It can be attached to. The tilt mechanism 21 rotates the screw shaft 21A and the like shown in FIG. 11 from the outside, thereby moving the floor member 19 together with the canopy 26 up and down (indicated by arrows A and B in FIG. 11). Direction).

  Note that the tilt mechanism 21 may be configured using a gas spring or the like, for example, as in the prior art described in Patent Document 2 (Japanese Patent Laid-Open No. 2000-72048) described above, such as a hydraulic cylinder or a pneumatic cylinder. The actuator may be configured using this actuator.

  Reference numeral 23 denotes a driver seat provided on the floor member 19, and the driver seat 23 is located on the front side of the partition plate 19D as shown in FIGS. 1 and 11, and the floor member 19 (driver seat base 19C shown in FIG. 7). An operator placed on the floor member 19 sits down when the vehicle is operated. Further, on the left and right sides of the driver's seat 23, operation levers 24 (only one is shown) are provided for operating the work device 4 and the like.

  On the other hand, on the front mounting plate 19B (see FIG. 7) of the floor member 19, left and right traveling levers / pedals 25 (only one shown) are disposed in front of the driver's seat 23 as shown in FIG. Has been. The left and right traveling levers / pedals 25 are operated manually or by the operator sitting in the driver's seat 23 to switch the control valve 16 to move the vehicle (lower traveling body 2) forward and backward. Or stop it.

  Reference numeral 26 denotes a canopy as a building provided on the floor member 19 so as to cover the driver's seat 23 from above, and the canopy 26 is arranged on the left side of the working device 4 (lower boom 4A) as shown in FIGS. Thus, the right side and the upper side of the driver's seat 23 are covered. The canopy 26 includes a right side portion 26A that covers the right side of the driver's seat 23, an upper surface portion 26B that covers the upper side of the driver's seat 23, and a so-called three-pillar that includes a right front pillar 26C, a right rear pillar 26D, and a left rear pillar 26E. It is configured as an expression canopy.

  Here, of the three pillars 26 </ b> C to 26 </ b> E provided on the canopy 26, the right front pillar 26 </ b> C is fixed to the position where the lower end side is the front right side of the floor member 19 by using screwing or welding means. Further, the lower right side pillar 26D and the left rear pillar 26E are fixed to the rear side mounting plate 19E of the floor member 19 by screwing or welding means as shown in FIG. The canopy 26 is not limited to a three-column canopy, and may be a two-column or four-column canopy.

  Next, reference numeral 27 denotes an exhaust device for exhausting exhaust gas generated from the engine 10 to the outside. The exhaust device 27 is connected to the exhaust port side of the engine 10 as shown in FIGS. The exhaust muffler 28, the fixed exhaust pipe 29, the movable exhaust pipe 39, and the like, which will be described later, are configured.

  An exhaust muffler 28 is provided on the exhaust side of the engine 10. The exhaust muffler 28 is formed as a cylindrical body closed at both ends as shown in FIG. ) Etc. are provided. The exhaust muffler 28 reduces the exhaust noise of the exhaust gas discharged from the engine 10 with a plurality of silencing walls. Further, a fixed exhaust pipe 29 described later is connected to the outlet side (exhaust gas outflow side) of the exhaust muffler 28 using a fixing means such as a bolt or welding.

  Reference numeral 29 denotes a fixed exhaust pipe provided together with the engine 10 in the machine room 9 on the revolving frame 5, and the fixed exhaust pipe 29 is arranged on one side in the length direction (described later) as shown in FIGS. The first bent pipe portion 29A) is connected to the exhaust port side of the engine 10 via the exhaust muffler 28, and the other side in the length direction (a startup pipe portion 29D described later) is separated into a movable exhaust pipe 39 described later. It can be connected.

  The fixed-side exhaust pipe 29 is connected to the outlet side of the exhaust muffler 28, is bent in an inverted U shape and extends downward, and on the lower end side of the first bent tube portion 29A. A second bent tube portion 29C connected via the connecting tube portion 29B and disposed so as to face the first bent tube portion 29A on the upper and lower sides, and rises upward from the second bent tube portion 29C. The rising pipe portion 29D and the like extend in this manner.

  In this case, the fixed-side exhaust pipe 29 is arranged such that the first bent pipe portion 29A straddles the left front column 17B of the floor support member 17 from above as shown in FIGS. , Extending downward, connecting the first and second bent pipe portions 29A, 29C. The second bent tube portion 29C is formed to be bent in a U shape in the opposite direction to the first bent tube portion 29A, and is fixed to an intermediate portion of the left front support column 17B via a mounting plate 30 or the like. Yes.

  The rising pipe portion 29D, which is the other side of the fixed exhaust pipe 29, is disposed so as to be exposed to the outside from the left side cover 8B of the exterior cover 8, and the upper surface of the counterweight 7 using the mounting bracket 31 and the like described later. It is fixed on the side. Further, the exposed portion of the rising pipe portion 29D is covered from the outside with protective covers 35 and 35, which will be described later, as shown in FIGS.

  Further, on the distal end (upper end) side of the rising pipe portion 29D, there is a diameter-reduced portion 29E that is tapered to increase the flow rate of the exhaust gas, and this diameter-reduced portion 29E is as shown in FIG. The inner diameter Db (Db <Da) is smaller than the inner diameter Da of the rising pipe portion 29D. Then, on the outer peripheral side of the reduced diameter portion 29E, a connection cap 40 of a movable exhaust pipe 39, which will be described later, is disposed so as to be covered from above.

  Reference numeral 31 denotes a mounting bracket for fixing and attaching the rising pipe portion 29D of the fixed-side exhaust pipe 29 to the counterweight 7. The mounting bracket 31 has one side facing the upper surface of the counterweight 7 as shown in FIGS. A stopper 32 such as a U-bolt is attached to the other side which is fixed by the bolt 31A or the like in the combined state and extends toward the rising pipe portion 29D as shown in FIGS. The stopper 32 sandwiches the outer periphery of the rising pipe portion 29D with the mounting bracket 31 and fastens the rising pipe portion 29D to the mounting bracket 31 (counterweight 7).

  .. Are a plurality of cover attachments provided on the outer peripheral side of the rising pipe portion 29D. These cover attachments 33 are formed by bending a metal plate into a substantially U shape as shown in FIG. It is formed of a metal fitting, and both end sides thereof are fixed to the outer peripheral surface of the rising pipe portion 29D by welding. Further, a nut 34 is fixed to a middle portion in the length direction of the cover fixture 33 by means such as welding, and a bolt 36 described later is screwed to the nut 34.

  In this case, two sets (a total of four) of cover fittings 33 are provided on the outer periphery of the rising pipe portion 29D, and the cover fittings 33, 33 of each set are mutually connected in the radial direction of the rising pipe portion 29D. Opposed to each other. Each of these sets of cover attachments 33 securely attach a protective cover 35 (described later) to the exposed portion of the rising pipe portion 29D at a plurality of locations, so that the length of the rising pipe portion 29D is as shown in FIG. They are arranged apart from each other in the direction.

  Numerals 35 and 35 are protective covers for covering the exposed portion of the rising pipe portion 29D from the outside of the fixed side exhaust pipe 29. Each protective cover 35 is divided into two in the left and right directions as shown in FIGS. It is comprised by a pair of divided | segmented cover. Here, each protective cover 35 is disposed so as to sandwich the exposed portion of the rising pipe portion 29D exposed to the outside from the outer cover 8 from the left and right directions, and the rising pipe portion 29D is used by using a plurality of bolts 36 and the like. It is fastened to the outer peripheral side. These bolts 36 are screwed onto the nuts 34 of the respective cover fittings 33, and thereby the protective cover 35 is detachably fixed to the outer periphery of the rising pipe portion 29D.

  In this case, an annular heat insulating space 37 made of an air layer is formed between the protective cover 35 and the rising pipe portion 29D as shown in FIG. 9, and this heat insulating space 37 is formed in the rising pipe portion 29D. The heat of the exhaust gas flowing in the direction of arrow E is prevented from being transmitted to the protective cover 35. In addition, on the upper end side of the protective cover 35, a throttle portion 35A having a diameter reduced in a taper shape toward the reduced diameter portion 29E of the fixed-side exhaust pipe 29 is formed. The throttle portion 35A is connected to a connection cap 40 described later. The outside air flows in (introduces) in the direction of arrow F.

  Reference numerals 38 and 38 denote slit-like gaps (hereinafter referred to as slit-like gaps 38) formed between the protective covers 35 and 35 on the outer peripheral side of the rising pipe portion 29D. The slit-like gaps 38 are as shown in FIG. The heat insulating space 37 (see FIG. 9) in the protective cover 35 communicates with the outside air and extends upward and in the direction along the protective cover 35. These slit-like gaps 38 are oriented at positions in the front and rear directions outside the exterior cover 8.

  39 is a movable exhaust pipe extending upward along the rear side of the canopy 26. The movable exhaust pipe 39 is a hollow chimney extending linearly upward and downward as shown in FIGS. 9 and a lower end side thereof is fixed to the rear mounting plate 19E of the floor member 19 via a bracket plate 42 and the like which will be described later. Further, the upper end side of the movable exhaust pipe 39 is fixed to the upper surface portion 26B of the canopy 26 via a suspension bracket 52 described later.

  Further, the upper end side of the movable exhaust pipe 39 is an open end 39A that is curved toward the rear of the canopy 26 and opened to the atmosphere. And this opening end 39A is arrange | positioned in the high position equivalent to the upper surface part 26B of the canopy 26, or slightly low, and discharges | emits the exhaust gas from the engine 10 in air | atmosphere.

  Here, the inner diameter Dc of the movable exhaust pipe 39 is larger than the fixed exhaust pipe 29 (the inner diameter Da of the rising pipe portion 29D and the inner diameter Db of the reduced diameter portion 29E) (Dc> Da) as shown in FIG. > Db). For this reason, in the movable side exhaust pipe 39, an outside air introduction hole, which will be described later, is utilized by utilizing the flow of exhaust gas flowing (upward) in the direction of arrow E from the rising pipe portion 29D of the fixed side exhaust pipe 29. From 41, the outside air for cooling can be efficiently introduced in the direction of arrow F.

  Reference numeral 40 denotes a connection cap constituting a connecting portion between the fixed side exhaust pipe 29 and the movable side exhaust pipe 39. The connection cap 40 is fixed to the lower end side of the movable side exhaust pipe 39 by means such as welding as shown in FIG. It is formed as a covered cylindrical body from the annular lid portion 40A thus formed and a cylindrical portion 40B extending downward from the outer peripheral side of the lid portion 40A. The connection cap 40 is tilted up and down integrally with the movable exhaust pipe 39 as will be described later, and is connected to the reduced diameter portion 29E of the fixed exhaust pipe 29 from above.

  In this case, the lid portion 40A and the cylinder portion 40B of the connection cap 40 surround the reduced diameter portion 29E of the fixed side exhaust pipe 29 with a gap from the upper side and the outer side in the radial direction. An outside air introduction hole 41 extending over the entire circumference for introduction in the direction is formed.

  Further, the connection cap 40 is provided with a mounting plate portion 40C which extends from the outer peripheral side of the lid portion 40A toward the bracket plate 42 which will be described later and is bent in an L shape, and this mounting plate portion 40C has a bolt 44 which will be described later. Etc., and fixed to the upper side of the bracket plate 42 in an abutting state. Thereby, the lower end side of the movable exhaust pipe 39 is firmly supported by the rear mounting plate 19E of the floor member 19 via the mounting plate portion 40C of the connection cap 40, the bracket plate 42, and the like.

  Reference numeral 42 denotes a bracket plate for attaching the lower end side of the movable exhaust pipe 39 to the rear mounting plate 19E of the floor member 19. The bracket plate 42 is a floor member using a bolt 43 or the like at the lower end side as shown in FIGS. 19 is fixed to the rear mounting plate 19E, and its upper side is extended so as to rise upward toward the mounting plate portion 40C of the connection cap 40. Then, on the upper side of the bracket plate 42, as shown in FIG. 8, a mounting plate portion 40C of the connection cap 40 is detachably fixed by a bolt 44 or the like.

  Here, the connection cap 40 that constitutes a connection portion between the fixed exhaust pipe 29 and the movable exhaust pipe 39 is disposed at the left rear position of the driver's seat 23 (canopy 26), and is disposed at the left position of the engine 10. The exhaust muffler 28 (see FIG. 5) is placed near the exhaust muffler 28. Further, between the reduced diameter portion 29E of the fixed-side exhaust pipe 29 and the connection cap 40, an outside air introduction hole 41 for introducing outside air in the direction of arrow F as shown in FIG. Is formed.

  For this reason, the fixed-side exhaust pipe 29 and the movable-side exhaust pipe 39 are placed in a state of being separated from each other via a gap (outside air introduction hole 41), and vibration or the like is not transmitted between them. That is, vibration from the fixed exhaust pipe 29 due to the operation of the engine 10 is not transmitted to the movable exhaust pipe 39, and both are placed in vibration modes independent of each other.

  An outer cylinder 45 is inserted through the outer periphery of the movable-side exhaust pipe 39. The outer cylinder 45 surrounds the outer periphery of the movable-side exhaust pipe 39 with a gap as shown in FIGS. For example, a heat insulating material 46 such as glass wool is disposed in a wound state. And the outer cylinder 45 suppresses that the heat | fever of the exhaust gas which passes the inside of the movable side exhaust pipe 39 is transmitted outside via the heat insulating material 46, and prevents the temperature rise of the protective cover 48 mentioned later.

  .. Are screw seats provided on the outer peripheral side of the outer cylinder 45. Each screw seat 47 is constituted by a cylindrical nut or the like as shown in FIG. 9, and is fixed to the outer peripheral surface of the outer cylinder 45 by welding. Has been. In this case, two sets (a total of four) of screw seats 47 are provided on the outer periphery of the outer cylinder 45, and the screw seats 47 of each set are arranged to face each other in the radial direction of the outer cylinder 45. . These sets of screw seats 47 are separated in the length direction (upward and downward) of the outer cylinder 45 in order to securely attach a protective cover 48 described later to the outer peripheral side of the movable exhaust pipe 39 at a plurality of locations. It is arranged.

  48 and 48 are a pair of protective covers for covering the outer cylinder 45 of the movable exhaust pipe 39 from the outside. Each of the protective covers 48 is a pair of two divided in the left and right directions as shown in FIGS. Consists of split covers. Here, each protective cover 48 is disposed so as to sandwich the portion of the movable side exhaust pipe 39 covered from the outside by the outer cylinder 45 (see FIG. 8) from the left and right directions, and uses a plurality of bolts 49 and the like. And is fastened to the outer peripheral side of the movable exhaust pipe 39. These bolts 49 are screwed onto the screw seats 47 shown in FIGS. 8 and 9, and thereby the protective cover 48 is detachably fixed to the outer periphery of the movable side exhaust pipe 39.

  In this case, an annular heat insulation space 50 made of an air layer is formed between the protective cover 48 and the outer cylinder 45 as shown in FIG. 9, and this heat insulation space 50 faces upward in the movable side exhaust pipe 39 ( The heat of the exhaust gas flowing upward in the direction of arrow E) is suppressed together with the heat insulating material 46 in the outer cylinder 45 from being transmitted to the protective cover 48. The protective cover 48 is formed in a length (height dimension) shorter than the movable exhaust pipe 39 in substantially the same manner as the outer cylinder 45, and the movable cover exhaust is within a height range where an operator or the like may contact, for example. The pipe 39 is covered from the outside.

  Reference numerals 51 and 51 denote slit-like gaps (hereinafter referred to as slit-like gaps 51) formed between the protective covers 48 and 48 on the outer peripheral side of the movable exhaust pipe 39. The slit-like gaps 51 are as shown in FIG. The heat insulating space 50 (see FIG. 9) in the protective cover 48 extends upward and in the direction along the protective cover 48 and communicates with the outside air. In this case, as shown in FIGS. 4 and 10, the slit-shaped gap 51 is oriented at positions in front and rear of the building (canopy 26).

  A suspension bracket 52 is provided on the upper end side of the canopy 26. The suspension bracket 52 is connected to the movable exhaust pipe 39 from the upper surface portion 26B of the canopy 26 as shown in FIGS. And a stopper 53 such as a U-bolt is attached to the lower side thereof. And this stopper 53 clamps the upper end side outer periphery of the movable side exhaust pipe 39 between the suspension brackets 52, and the movable side exhaust pipe 39 is fastened to this suspension bracket 52 (canopy 26). It is to be fixed.

  Thus, the movable side exhaust pipe 39 is fixed at the lower end side to the rear side mounting plate 19E of the floor member 19 using the bracket plate 42 and the like, and the upper end side is fixed to the upper end side of the canopy 26 using the hanging bracket 52 and the like. ing. Accordingly, the movable exhaust pipe 39 is disposed so as to extend upward along the canopy 26 together with the protective cover 48 and the like, and the opening end 39A of the movable exhaust pipe 39 is slightly lower than the upper surface portion 26B of the canopy 26. The operator is seated at a position higher than the face of the operator sitting in the driver's seat 23.

  The movable exhaust pipe 39 is attached to the floor member 19 and the canopy 26 so as to extend upward along the rear surface side of the canopy 26 without using any special support means outside the machine room 9. Therefore, the movable-side exhaust pipe 39 is tilted up integrally with the floor member 19 and the canopy 26 when the floor member 19 is tilted upward (tilt up) as shown in FIG. In addition, the movable exhaust pipe 39 is separated so as to be lifted upward from the other side (the reduced diameter portion 29E side) of the fixed exhaust pipe 29.

  On the other hand, when the floor member 19 is tilted down as shown in FIGS. 1 and 8, the lower end side of the movable exhaust pipe 39 overlaps with the reduced diameter portion 29 </ b> E of the fixed exhaust pipe 29 via the connection cap 40. Connected to. In this state, the exhaust gas from the engine 10 flows out upwardly from the diameter-reduced portion 29E side of the fixed-side exhaust pipe 29 into the movable-side exhaust pipe 39 as an updraft and introduces outside air for cooling to the outside. While being introduced so as to be sucked from the hole 41 (see FIG. 8), it is discharged from the upper end (open end 39A) of the movable exhaust pipe 39 to the rear of the vehicle toward the outside of the canopy 26.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, the operation thereof will be described.

  First, an operator who gets into the canopy 26 sits in the driver's seat 23 and starts the engine 10 to drive the hydraulic pump 12 and the like. In this state, the lower traveling body 2 is caused to travel by operating the traveling lever / pedal 25. Further, by operating the operation lever 24 for the left and right operations, for example, the work device 4 is rocked up and down while swinging the work device 4 in the left and right directions, and soil excavation work is performed. Can do.

  Further, the exhaust gas generated by the operation of the engine 10 is reduced in noise in the exhaust muffler 28 provided in the machine room 9 and discharged to the fixed exhaust pipe 29, and then the outside of the machine room 9 is transferred to the canopy 26. It is discharged to the movable exhaust pipe 39 that extends upward along the upper end, and discharged from the opening end 39A on the upper end side toward the rear of the vehicle (outside the canopy 26). As a result, the exhaust gas does not enter and enter the driver's seat 23 side of the vehicle, and the living environment of the operator in the canopy 26 can be favorably maintained.

  In this case, a connection cap 40 that constitutes a connection portion between the fixed-side exhaust pipe 29 and the movable-side exhaust pipe 39 is disposed at a position on the left rear side of the driver's seat 23 (canopy 26). Therefore, the connection cap 40 (the reduced diameter portion 29E of the fixed-side exhaust pipe 29) can be disposed at a position close to the exhaust muffler 28 (see FIG. 5) disposed on the left side of the engine 10, and the fixed-side exhaust pipe It is not necessary to make the entire length of 29 excessively long, and the fixed-side exhaust pipe 29 can be made the minimum necessary length.

  Thereby, the fixed side exhaust pipe 29 provided in the machine room 9 can be reduced in size and compactly formed, and the layout design and the like in the machine room 9 can be easily performed. The machine room 9 can be reduced in size, and the engine 10 can be installed in the front of the revolving frame 5 together with the counterweight 7 and the like. As a result, the counterweight 7 and the like can be accommodated in a circle having a turning radius R as shown in FIGS. 2 and 5, and the small turning type hydraulic excavator 1 can be realized.

  Further, between the reduced diameter portion 29E of the fixed side exhaust pipe 29 and the connection cap 40, as shown in FIG. 9, an outside air introduction hole 41 for introducing outside air in the direction of arrow F is formed as an annular gap extending over the entire circumference. Forming. Thereby, it is possible to reliably prevent vibration and the like from being transmitted between the fixed exhaust pipe 29 and the movable exhaust pipe 39.

  For this reason, for example, vibration from the fixed exhaust pipe 29 due to the operation of the engine 10 can be prevented from being transmitted to the movable exhaust pipe 39, and vibration resistance between the fixed exhaust pipe 29 and the movable exhaust pipe 39 can be improved. At the same time, sufficient strength against vibrations and the like can be secured.

  In addition, since the outside air introduction hole 41 is formed between the reduced diameter portion 29E of the fixed exhaust pipe 29 and the movable exhaust pipe 39 (connection cap 40), the engine 10 enters the fixed exhaust pipe 29. By utilizing the flow of exhaust gas discharged, cooling air (outside air) can be introduced into the movable exhaust pipe 39 from the outside of the exterior cover 8.

  As a result, the temperature rise of the movable exhaust pipe 39 extending upward along the canopy 26 at the rear left side of the driver's seat 23 can be suppressed by the air flow from the outside air introduction hole 41, and the temperature of the movable exhaust pipe 39 can be reduced. While being able to reduce, the temperature rise around the driver's seat 23 (in the canopy 26) can also be suppressed low.

  Further, of the fixed side exhaust pipe 29, the rising pipe portion 29D exposed from the exterior cover 8 and the movable side exhaust pipe 39 are covered from the outside by protective covers 35 and 48, respectively, and the heat insulating spaces 37 and 50 are formed inside thereof. It is set as the structure to form. Therefore, even if the rising pipe portion 29D of the fixed side exhaust pipe 29 and the movable side exhaust pipe 39 are disposed so as to be exposed at the outer position of the exterior cover 8, these exposed portions are covered with the protective covers 35, 48, etc. Thus, a heat insulating action can be provided, and surrounding workers can be thermally protected from the heat of the exhaust gas flowing through the exhaust pipes 29 and 39.

  In particular, the heat-insulating material 46 is wound around the outer cylinder 45 on the outer peripheral side of the movable-side exhaust pipe 39, and the protective cover 48 is attached from above. Therefore, the movable-side exhaust pipe 39 and the protective cover 48 are attached. The thermal insulation effect can be reliably increased, and for example, even if an operator or the like accidentally touches the protective cover 48, it is possible to prevent burns and ensure thermal safety.

  In addition, since the entire circumferential gap serving as the outside air introduction hole 41 is formed between the reduced diameter portion 29E of the fixed side exhaust pipe 29 and the connection cap 40, the floor member 19 together with the canopy 26 and the like in FIG. When tilting up and down in the directions indicated by arrows A and B, it is possible to prevent the reduced diameter portion 29E of the fixed-side exhaust pipe 29 and the connection cap 40 from contacting or interfering with each other. The reduced diameter portion 29E of the fixed side exhaust pipe 29 and the lower end side of the movable side exhaust pipe 39 can be smoothly separated or connected via the connection cap 40.

  Thus, according to the present embodiment, one side of the engine 10 mounted on the rear side of the turning frame 5 is connected to the exhaust port side of the engine 10 via the exhaust muffler 28 and the other side is exposed to the outside from the exterior cover 8. The fixed-side exhaust pipe 29 is connected to the other side of the fixed-side exhaust pipe 29 so as to be separable, and the movable-side exhaust pipe 39 extending upward along the canopy 26 is provided.

  For this reason, when the canopy 26 is tilted up together with the floor member 19 by using the tilt mechanism 21 or the like, the lower end side (connection cap 40) of the movable exhaust pipe 39 is connected to the reduced diameter portion of the fixed exhaust pipe 29. It can be separated from the 29E side so as to be lifted upward, and maintenance (inspection) of the engine 10 and the like performed in this tilt-up state should be performed with a wide work space without being obstructed by the movable exhaust pipe 39 or the like. Can do.

  The movable exhaust pipe 39 is fixedly attached to the upper surface portion 26B of the canopy 26 and the rear mounting plate 19E of the floor member 19 by the bracket plate 42 and the hanging bracket 52 shown in FIG. For example, the movable exhaust pipe 39 can be held in a stable posture on the floor member 19 and the canopy 26 side without providing special support means on the revolving frame 5.

  Further, when the floor member 19 is placed on the revolving frame 5 together with the canopy 26 (tilt down) and the operation of the excavator 1 is performed, the connection cap 40 is placed on the reduced diameter portion 29E of the fixed exhaust pipe 29. The movable side exhaust pipe 39 can be kept connected to the fixed side exhaust pipe 29 so that the exhaust gas from the engine 10 canopy through the fixed side exhaust pipe 29 and the movable side exhaust pipe 39 in this state. 26 can be discharged to the outside.

  As a result, the exhaust gas from the engine 10 can be prevented from entering and entering the driver's seat 23 side, the operator's living environment in the canopy 26 can be kept good, and the driving operability can be improved. Reliability as a construction machine can be improved.

  Further, the movable exhaust pipe 39 is configured such that the upper end opening end 39A is lower than the upper surface of the canopy 26 and higher than the face of the operator sitting in the driver's seat 23. It is possible to prevent the exhaust gas discharged from the opening end 39 </ b> A from entering and entering the operator, and to maintain a good living environment for the operator. And the movable side exhaust pipe 39 can be prevented from projecting above the canopy 26 when the hydraulic excavator 1 is transported, so that transport work and the like can be performed smoothly.

  Next, FIG. 12 shows a second embodiment of the present invention, which is characterized in that the construction machine is applied to a swing post type hydraulic excavator instead of an offset boom type. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 61 denotes a swing post type excavator as a construction machine employed in the present embodiment. The excavator 61 has a crawler type lower traveling body 62 capable of self-propelling and a lower traveling body 62 on the lower traveling body 62. It is comprised by the upper turning body 63 mounted so that turning is possible.

  The upper swing body 63 is configured in substantially the same manner as the upper swing body 3 described in the first embodiment, and includes a counterweight 7, an exterior cover 8, a floor member 19, a floor front support portion 20, a driver seat 23, It has a turning frame 65 and a canopy 66 which will be described later.

  Reference numeral 64 denotes a swing post type working device provided at the front part of the upper swing body 63. The working device 64 includes, for example, a swing post 64A, a boom 64B, an arm 64C, a bucket 64D, and the like. A swing post 64A of the working device 64 is attached to a swing bracket 65A of a turning frame 65, which will be described later, so as to swing left and right.

  Here, in the swing post type work device 64, the swing post 64A is swung to the left and right with respect to the swing bracket 65A, and the boom 64B and the arm 64C are lifted up and down, and the bucket on the tip side is moved. 64D performs excavation work (including side trenches) such as earth and sand.

  Reference numeral 65 denotes a revolving frame constituting a frame of the upper revolving structure 63. The revolving frame 65 is configured in substantially the same manner as the revolving frame 5 described in the first embodiment. However, the swivel frame 65 in this case is different in that a swing bracket 65A for swingably supporting the swing post 64A of the working device 64 to the left and right is provided at the front portion thereof.

  Reference numeral 66 denotes a canopy as a building provided on the floor member 19 so as to cover the driver's seat 23 from above. The canopy 66 is configured in substantially the same manner as the canopy 26 described in the first embodiment. The canopy 66 includes a plurality of pillars 66A and a roof 66B that serves as a roof provided on the upper end side of the pillars 66A.

  A bracket plate 67 is provided on the pillar 66A of the canopy 66. The bracket plate 67 is used in place of the suspension bracket 52 described in the first embodiment, and the upper end side of the movable exhaust pipe 39 is connected to the pillar. It is fixed to the upper side of 66A.

  Thus, even in the present embodiment configured as described above, it is possible to obtain substantially the same operation and effect as in the first embodiment, and the swing post type hydraulic excavator 61 also moves upward along the canopy 66. The movable exhaust pipe 39 extending in the direction can be separably connected to the lower fixed exhaust pipe 29 (protective cover 35 side).

  In the first embodiment, slit-shaped gaps 51, 51 are formed between a pair of protective covers 48, 48 that cover the movable-side exhaust pipe 39 from the outside. The case of orientation in the direction has been described as an example. However, the present invention is not limited to this. For example, as in the modification shown in FIG. 13, the mounting positions of the screw seats 47 ′ and 47 ′ provided on the outer peripheral side of the outer cylinder 45 are changed. The slit-shaped gaps 51 ′ and 51 ′ formed between the protective covers 48 ′ and 48 ′ may be oriented in the turning direction of the upper swing body 3 (the direction indicated by the arrow C shown in FIG. 2).

  In this case, when the upper swing body 3 is driven to turn in the direction of arrow C, the cooling air in the direction of arrow C can be satisfactorily taken into the protective cover 48 ′ from the slit-shaped gap 51 ′. The heat insulating space 50 between the outer cylinder 45 of the movable exhaust pipe 39 and the protective cover 48 'can be efficiently cooled by the cooling air at this time. The same changes can be made in the second embodiment.

  Further, in each of the above-described embodiments, the canopy-spec hydraulic excavators 1 and 61 including the canopies 26 and 66 as the buildings that cover the upper side of the driver's seat 23 have been described as examples. However, the present invention is not limited to this, and may of course be applied to, for example, a cab specification hydraulic excavator.

  Further, the present invention is not limited to a hydraulic excavator, and can be widely applied to other construction machines including a building or the like on a floor member such as a work vehicle called a hydraulic crane, a wheel loader, a bulldozer, or a lift truck. Applicable.

1 is a front view showing a canopy-spec hydraulic excavator according to a first embodiment of the present invention. It is a top view which expands and shows the hydraulic shovel in FIG. 1 from upper direction. It is the right view of FIG. 1 which looked at the hydraulic shovel from back. FIG. 4 is an enlarged view of a main part of FIG. 3 showing a fixed side exhaust pipe exposed from an exterior cover, a movable side exhaust pipe provided in the canopy, and the like. It is a top view which shows a turning frame etc. in the state which removed the floor member, the exterior cover, etc. It is the elements on larger scale which looked at the engine provided in the rear part side of the turning frame, the fixed side exhaust pipe, etc. from the arrow VI-VI direction in FIG. It is a disassembled perspective view which expands and shows a floor member, a floor support member, etc. It is sectional drawing which expands and shows a fixed side exhaust pipe, a movable side exhaust pipe, etc. from the arrow VIII-VIII direction in FIG. It is sectional drawing which expands and shows the connection part etc. of a fixed side exhaust pipe and a movable side exhaust pipe from the arrow IX-IX direction in FIG. It is sectional drawing which expands and shows a movable side exhaust pipe, a protective cover, etc. from the arrow XX direction in FIG. It is a front view of the upper revolving body which shows the state which tilted up the canopy in FIG. 1 with the floor member. It is a front view which shows the swing post type hydraulic excavator by 2nd Embodiment. It is sectional drawing in the same position as FIG. 10 which shows the movable side exhaust pipe, protective cover, etc. by the modification of this invention.

Explanation of symbols

1,61 Hydraulic excavator (Construction machinery)
3,63 upper swing body 4,64 work device 5,65 swing frame (frame)
7 counterweight 8 exterior cover 9 machine room 10 engine 11 air cleaner 12 hydraulic pump 13 heat exchanger 17 floor support member 18 mounting table 19 floor member 19A footrest plate 19B front mounting plate 19C driver seat base 19D partition plate 19E rear mounting plate 20 Floor support 21 Tilt mechanism 23 Driver's seat 26, 66 Canopy (building)
27 Exhaust device 28 Exhaust muffler 29 Fixed side exhaust pipe 29A First bent pipe (one side of fixed side exhaust pipe)
29D Startup pipe (other side of fixed exhaust pipe)
29E Reduced diameter portion 31 Mounting bracket 35, 48, 48 'Protective cover 37, 50 Thermal insulation space 38, 51, 51' Slit-like gap (gap)
39 Movable exhaust pipe 39A Open end 40 Connection cap (connection part)
40C Mounting plate portion 41 Outside air introduction hole 42 Bracket plate 45 Outer tube 46 Heat insulating material 52 Suspended bracket 67 Bracket plate R Turning radius

Claims (6)

A frame provided with a working device on the front side, an engine mounted on the rear side of the frame, an exhaust device for exhausting exhaust gas from the engine to the outside, and a rear side of the frame located on the rear side of the engine A counterweight provided on an end side, an exterior cover provided on the frame so as to surround the engine from the outside between the counterweight, and a counterweight provided on the frame on the front side of the engine A floor member that can be tilted up and down with the front side as a supporting point, and a building that is provided on the floor member and covers a driver's seat on which the operator sits at least from the upper side for operating the engine and the work device. In the construction machine
The exhaust device is
A fixed-side exhaust pipe , one side of which is located on the frame and connected to the exhaust port side of the engine and the other side is disposed at a position exposed to the outside from the exterior cover and fixed to the counterweight ;
Movable side which extends the exhaust gas upwards the are detachably connected with the outside of the exterior cover along said building provided in the building to the other side of the fixed-side exhaust pipe for discharging to the outside from the previous SL engine constituted by an exhaust pipe,
The movable exhaust pipe is configured to lift up the floor member separately from the fixed exhaust pipe when the floor member is tilted up together with the building in a direction away from the counterweight. .   A connecting portion between the fixed-side exhaust pipe and the movable-side exhaust pipe is disposed at a position exposed to the outside from the exterior cover at a rear position of the building, and vibration is transmitted from the fixed-side exhaust pipe to the movable-side exhaust pipe. The construction machine according to claim 1, wherein the construction machine is configured to prevent this.   The connection portion between the fixed side exhaust pipe and the movable side exhaust pipe has an outside air introduction hole for introducing outside air for cooling into the movable side exhaust pipe using the flow of exhaust gas through the fixed side exhaust pipe. The construction machine according to claim 1 or 2, wherein the construction machine is formed.   The construction machine according to claim 1, 2 or 3, wherein the fixed side exhaust pipe and the movable side exhaust pipe are each configured to be covered from the outside by a protective cover.   The frame is a revolving frame of an upper revolving body provided on a lower traveling body so as to be revolved, and the protective cover includes a plurality of divided covers divided in a radial direction of the exhaust pipe, The construction machine according to claim 4, wherein a gap is provided between the covers so as to be arranged in a turning direction of the turning frame so as to allow cooling air to flow from outside.   The construction machine according to claim 1, 2, 3, 4 or 5, wherein the movable exhaust pipe is configured such that an opening end that opens the exhaust gas to outside air is disposed at a height position corresponding to the upper surface of the building. .

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