JP2019138005A - Work vehicle - Google Patents

Abstract

To provide a work vehicle capable of reducing a physical burden on an operator in moving a tilt floor.SOLUTION: A work vehicle comprises: a traveling device for supporting a vehicle body frame; a cab including a tilt floor supported in a tiltable manner on the vehicle body frame via a tilt mechanism provided at a front portion of the vehicle body frame; and a first coupling mechanism provided at a rear portion of the cab and detachably coupled to one end of a rod-shaped operation member. In a state where the operation member is connected to the first coupling mechanism, the other end of the operation member is disposed outside the traveling device.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a work vehicle.

  In a technical field related to a work vehicle, a work vehicle including a tilt floor as disclosed in Patent Document 1 is known. In order to alleviate the physical burden on the operator when lifting the tilt floor, the work vehicle is provided with a gas spring that generates a force that moves the tilt floor and a torsion bar that assists in moving the tilt floor.

International Publication No. 2016/108295

  For example, a track-and-land work vehicle is equipped with more emergency or auxiliary equipment than a standard land-only work vehicle. The cab is equipped with an operating device or a control panel for operating emergency or auxiliary equipment. For this reason, the weight of the cab of the track / land combined use working vehicle is larger than the weight of the cab of the land-only working vehicle. As a result, the physical burden on the operator when lifting the tilt floor in the track-and-land work vehicle is further increased.

  An object of an aspect of the present invention is to provide a work vehicle that can reduce a worker's physical burden in moving a tilt floor.

  According to an aspect of the present invention, a traveling device that supports a vehicle body frame, a cab including a tilt floor that is tiltably supported by the vehicle body frame via a tilt mechanism provided at a front portion of the vehicle body frame, A first connection mechanism that is provided at a rear portion of the cab and that is detachably connected to one end of a rod-shaped operation member, and in a state where the operation member is connected to the first connection mechanism, A work vehicle is provided in which the other end portion is disposed outside the travel device.

  According to the aspect of the present invention, there is provided a work vehicle that can reduce the physical burden on the worker in the movement of the tilt floor.

FIG. 1 is a perspective view showing a work vehicle according to the present embodiment. FIG. 2 is a perspective view showing the work vehicle according to the present embodiment. FIG. 3 is a side view showing the work vehicle according to the present embodiment. FIG. 4 is a perspective view of the auxiliary device according to the present embodiment as viewed from the right front. FIG. 5 is a view showing a part of the auxiliary hydraulic pump and the operation member according to the present embodiment. FIG. 6 is a view showing a support mechanism capable of supporting the operation member according to the present embodiment. FIG. 7 is a perspective view showing the work vehicle according to the present embodiment. FIG. 8 is a plan view showing the work vehicle according to the present embodiment. FIG. 9 is a view showing a coupling mechanism according to the present embodiment. FIG. 10 is a diagram illustrating an example of the operation of the hydraulic excavator according to the present embodiment. FIG. 11 is a diagram illustrating a first modification of the tubular member according to the present embodiment. FIG. 12 is a diagram illustrating a second modification of the tubular member according to the present embodiment.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings, but the present invention is not limited thereto. The components of the embodiments described below can be combined as appropriate. Some components may not be used.

[Work vehicle]
1 and 2 are perspective views showing a work vehicle 1 according to the present embodiment. In the present embodiment, it is assumed that the work vehicle 1 is a track-and-land work vehicle. The track-and-land work vehicle is a work vehicle capable of performing both a track work such as a rail track maintenance work and a ground work such as excavation work.

  In this embodiment, the track / land combined working vehicle is a track / land combined hydraulic excavator. In the following description, the track and land combined hydraulic excavator is appropriately referred to as a hydraulic excavator 1.

  As shown in FIG. 1, the excavator 1 includes a work machine 10 that operates by hydraulic pressure, a vehicle main body 20 that supports the work machine 10, and a traveling device 30 that supports the vehicle main body 20.

  The work machine 10 is supported by the vehicle body 20. In the present embodiment, the work machine 10 is an offset work machine having a so-called offset boom. The work implement 10 includes a main boom 11 connected to the vehicle main body 20, an offset boom 12 connected to the main boom 11, an arm 13 connected to the offset boom 12, and an attachment 14 connected to the arm 13. Have. The attachment 14 is replaceable. Examples of the attachment 14 include at least one of a bucket capable of excavating an object to be excavated, a gripper capable of grasping an object to be grasped such as a rail or a sleeper, and a tie tamper capable of compacting the ground. FIG. 1 shows an example in which a bucket is connected to an arm 13 as an attachment 14. In the following description, the attachment 14 is appropriately referred to as a bucket 14.

  The vehicle body 20 and the main boom 11 are connected via a boom pin. The main boom 11 is supported by the vehicle body 20 so as to be rotatable about a boom rotation axis AX1. The main boom 11 and the offset boom 12 are connected via a first offset pin. The offset boom 12 is supported by the main boom 11 so as to be rotatable about the first offset shaft. The offset boom 12 and the arm 13 are connected via an arm pin. The arm 13 is supported by the offset boom 12 so as to be rotatable about the arm rotation axis AX2. Further, the offset boom 12 and the arm 13 are connected via a second offset pin. The arm 13 is supported by the offset boom 12 so as to be rotatable about the second offset axis. The arm 13 and the bucket 14 are connected via a bucket pin. The bucket 14 is supported by the arm 13 so as to be rotatable about the bucket rotation axis AX3.

  The vehicle main body 20 includes a vehicle body frame 21 supported by the traveling device 30 and a cab 22 supported by the vehicle body frame 21. The cab 22 has a driver's cab in which the driver gets on. A driver's seat on which the driver is seated is provided in the driver's cab. The vehicle body 20 is disposed above the traveling device 30 and can turn around the turning axis RX while being supported by the traveling device 30. In the following description, the vehicle main body 20 is appropriately referred to as an upper turning body 20, and the traveling device 30 is appropriately referred to as a lower traveling body 30.

  The boom rotation axis AX1, the arm rotation axis AX2, and the bucket rotation axis AX3 are parallel to each other. The boom rotation axis AX1, the arm rotation axis AX2, and the bucket rotation axis AX3 are orthogonal to the axis parallel to the turning axis RX. In the following description, the direction parallel to the boom rotation axis AX1, the arm rotation axis AX2, and the bucket rotation axis AX3 is appropriately referred to as the vehicle width direction of the upper swing body 20, and the direction parallel to the swing axis RX is appropriately set. The vertical direction of the upper swing body 20 is referred to as the vertical direction of the upper rotary body 20, and the direction perpendicular to both the boom rotation axis AX1, the arm rotation axis AX2, and the bucket rotation axis AX3 and the swing axis RX is appropriately referred to as the longitudinal direction of the upper swing body 20. .

  In the present embodiment, the direction in which the bucket 14 is present is the front, and the reverse direction in the front is the rear, based on the driver seated on the driver's seat in the cab. One in the vehicle width direction is to the right, and the opposite direction to the right is to the left. The bucket 14 is disposed in front of the upper swing body 20. FIG. 1 is a perspective view of the work vehicle 1 viewed from the left front, and FIG. 2 is a perspective view of the work vehicle 1 viewed from the left rear.

  The work machine 10 is operated by a hydraulic cylinder. The excavator 1 includes a boom cylinder 15 that drives a main boom 11, an offset cylinder 16 that drives an offset boom 12, an arm cylinder 17 that drives an arm 13, and a bucket cylinder 18 that drives a bucket 14. When the boom cylinder 15 is operated, the base end portion of the main boom 11 rotates about the boom rotation axis AX1, and the tip end portion of the main boom 11 moves in the vertical direction. When the arm cylinder 17 is operated, the base end portion of the arm 13 rotates about the arm rotation axis AX2, and the tip end portion of the arm 13 moves in the vertical direction. When the bucket cylinder 18 is operated, the base end portion of the bucket 14 rotates about the bucket rotation axis AX3, and the cutting edge of the bucket 14 moves in the vertical direction.

  The work machine 10 which is an offset type work machine can move the bucket 14 in the vehicle width direction of the upper swing body 20. The offset cylinder 16 operates and the offset boom 12 rotates around the first offset shaft, whereby the arm 13 and the bucket 14 move in the vehicle width direction. In synchronism with the rotation of the offset boom 12 around the first offset axis, the arm 13 rotates around the second offset axis. Thereby, the arm 13 and the bucket 14 are translated in the vehicle width direction. The bucket 14 is disposed in front of the upper swing body 20. The bucket 14 can be moved to the front of the driver's seat by the operation of the offset cylinder 16.

  The upper swing body 20 includes a vehicle body frame 21 and a cab 22 including a tilt floor 24 supported by the vehicle body frame 21 so as to be tiltable via a tilt mechanism 23 provided at a front portion of the vehicle body frame 21. The cab 22 is a member that forms a cab. The cab 22 includes a tilt floor 24, a plurality of support columns 25 supported by the tilt floor 24, a canopy 26 supported by the upper end portion of the support column 25, and a front of the driver's seat and is supported by the two support columns 25. A windshield 27.

  The lower traveling body 30 supports the vehicle body frame 21 of the upper swing body 20. The lower traveling body 30 is disposed on each of the wheels 31 for traveling on the track, the crawler belts 32 for traveling on the ground, the center frame 33 for pivotally supporting the vehicle body frame 21, and the front and rear of the center frame 33. The movable frame 34 that supports the wheels 31, the track frame 35 that is disposed on each of the left and right sides of the center frame 33, supports the crawler belt 32, and the drive wheels 37 that rotate the crawler belt 32.

  Four wheels 31 are provided. The movable frame 34 is supported by the center frame 33. The wheel 31 is rotatably supported by the movable frame 34. The lower traveling body 30 includes a hydraulic actuator 36 that can generate power for adjusting the relative position between the wheel 31 and the crawler belt 32. The hydraulic actuator 36 is, for example, a hydraulic cylinder. The hydraulic actuator 36 can move the movable frame 34 in the vertical direction. The movable frame 34 is disposed between the pair of crawler belts 32. The hydraulic actuator 36 moves the movable frame 34 so as to change from one of the state in which the wheel 31 is disposed above the crawler belt 32 and the state in which the wheel 31 is disposed below. With the wheel 31 disposed below the crawler belt 32, the hydraulic excavator 1 travels on the track by rotating the wheel 31 on the track. The excavator 1 travels on the ground by rotating the crawler belt 32 on the ground with the wheels 31 disposed above the crawler belt 32.

  The drive wheel 37 is rotated by power generated by a hydraulic motor provided in the excavator 1. The drive wheel 37 rotates around the rotation axis DX. As the driving wheel 37 rotates, the crawler belt 32 supported by the driving wheel 37 rotates.

  FIG. 3 is a side view showing the work vehicle 1 according to the present embodiment. As shown in FIG. 3, the upper swing body 20 includes a body frame 21 and a cab 22 including a tilt floor 24 supported by the body frame 21.

  The vehicle body frame 21 is a base member of the upper swing body 20. The tilt floor 24 is supported by the vehicle body frame 21. The tilt mechanism 23 includes a hinge mechanism and is disposed at the front portion of the vehicle body frame 21. The front part of the vehicle body frame 21 and the front part of the tilt floor 24 are connected via a tilt mechanism 23. The tilt floor 24 is supported by the vehicle body frame 21 via the tilt mechanism 23 so as to be tiltable.

  The tilt axis BX of the tilt mechanism 23 is parallel to a horizontal plane orthogonal to the turning axis RX. The tilt axis BX extends in the vehicle width direction. The tilt floor 24 tilts forward.

  The tilt floor 24 is tilted within a specified tilt range. The upper swing body 20 is provided with a stopper mechanism that defines the tilt range of the tilt floor 24. In the tilt-down state in which the tilt floor 24 is disposed at the lower end of the tilt range, the upper surface of the tilt floor 24 is parallel to a horizontal plane orthogonal to the turning axis RX. In the tilt-up state in which the tilt floor 24 is disposed at the upper end of the tilt range, the upper surface of the tilt floor 24 is inclined with respect to a horizontal plane orthogonal to the turning axis RX.

  In the tilt-down state, an accommodation space 28 is formed between the vehicle body frame 21 and the tilt floor 24. The accommodation space 28 accommodates the main device 2. The main device 2 includes, for example, a main engine and a main hydraulic pump. The accommodation space 28 may accommodate a main motor 2 that includes a travel motor that rotates the wheels 31, a switching device that switches between travel by the wheels 31 and travel by the crawler belts 32, a brake device, and other main devices. .

  As shown in FIGS. 1, 2, and 3, each of the left part, the right part, and the rear part of the vehicle body frame 21 has an arc shape in a cross section orthogonal to the turning axis RX. In the present embodiment, the upper swing body 20 includes a case member 60 provided at the right front portion of the vehicle body frame 21. The case member 60 protrudes forward from the right front portion of the vehicle body frame 21. Case member 60 is disposed in front of body frame 21 and cab 22 and to the right of work implement 10. The case member 60 accommodates auxiliary or emergency auxiliary equipment 3. The auxiliary device 3 includes, for example, an auxiliary engine and an auxiliary hydraulic pump. In addition, the case member 60 may accommodate the auxiliary battery and other auxiliary devices, or the emergency cock and other emergency devices as the auxiliary device 3.

  The track-and-shore hydraulic excavator 1 has more auxiliary devices 3 than a standard on-shore hydraulic excavator. When the excavator 1 is working on the track, when the main device 2 accommodated in the accommodating space 28 has an abnormality, the auxiliary device 3 is activated to move the excavator 1 on the track. And continue working.

  The cab 22 is equipped with an operating device for operating the auxiliary equipment 3 and a control panel for controlling the auxiliary equipment 3. For this reason, the weight of the cab 22 of the hydraulic excavator 1 for on-land use is larger than the weight of the cab of the hydraulic excavator dedicated to land.

[Auxiliary hydraulic pump]
FIG. 4 is a perspective view of the auxiliary device 3 according to the present embodiment as viewed from the right front. A plurality of auxiliary or emergency auxiliary devices 3 are arranged in the internal space of the case member 60. FIG. 4 shows an example in which an auxiliary hydraulic pump 3 </ b> A is provided as the auxiliary device 3.

  The auxiliary hydraulic pump 3 </ b> A (hydraulic pump) is a manual hydraulic pump that is activated by an operator's operation when an abnormality occurs in the main hydraulic pump that is the main device 2 accommodated in the accommodating space 28. When the auxiliary hydraulic pump 3A is operated and hydraulic oil is discharged from the auxiliary hydraulic pump 3A, at least one of the hydraulic actuators mounted on the hydraulic excavator 1 is operated. In the present embodiment, at least the hydraulic actuator 36 is operated by discharging hydraulic oil from the auxiliary hydraulic pump 3A. Further, in the present embodiment, the boom cylinder 15 is also operated by discharging hydraulic oil from the auxiliary hydraulic pump 3A. The hydraulic excavator 1 is provided with a switching valve for supplying hydraulic oil discharged from the auxiliary hydraulic pump 3 </ b> A to one of the hydraulic actuator 36 or the boom cylinder 15. The operator can supply the hydraulic oil discharged from the auxiliary hydraulic pump 3 </ b> A to at least one of the hydraulic actuator 36 and the boom cylinder 15 by operating the switching valve.

  In the present embodiment, the operator operates the auxiliary hydraulic pump 3 </ b> A using the operation member 6. For example, when an abnormality occurs in the main hydraulic pump, as shown in FIG. 4, the operator operates the lid 61 of the case member 60 to open the opening of the case member 60 and accommodate it inside the case member 60. The auxiliary hydraulic pump 3A and the operating member 6 are connected. The operator can operate the auxiliary hydraulic pump 3A by operating the operation member 6 connected to the auxiliary hydraulic pump 3A.

  FIG. 5 is a view showing a part of the auxiliary hydraulic pump 3A and the operation member 6 according to the present embodiment. As shown in FIGS. 4 and 5, the operation member 6 is a rod-like member, and has one end portion 6A and the other end portion 6B. In this embodiment, the operation member 6 is a straight rod-shaped member. The auxiliary hydraulic pump 3A has a coupling mechanism 3B (second coupling mechanism) to which one end 6A of the operation member 6 is detachably coupled. In the present embodiment, the coupling mechanism 3B includes a cylindrical member and has a hole 3C into which the one end 6A of the operation member 6 is inserted.

  When operating the auxiliary hydraulic pump 3A, the operator connects the connection mechanism 3B and the operation member 6 of the auxiliary hydraulic pump 3A. In the present embodiment, the connection mechanism 3B of the auxiliary hydraulic pump 3A and the operation member 6 are connected by inserting the one end 6A of the operation member 6 into the hole 3C of the connection mechanism 3B. After the coupling mechanism 3B and the operating member 6 are connected, the operator holds the other end 6B of the operating member 6 and moves the other end 6B of the operating member 6 as indicated by an arrow R in FIG. Let That is, the operator operates so that the other end portion 6B of the operation member 6 reciprocates around an axis parallel to the turning axis RX in a state where the connection mechanism 3B and the one end portion 6A of the operation member 6 are connected. The member 6 is operated. The auxiliary hydraulic pump 3 </ b> A is operated by operating the operation member 6. The auxiliary hydraulic pump 3 </ b> A discharges hydraulic oil that operates the hydraulic actuator 36 by operating the operation member 6. Thereby, even if an abnormality occurs in the main hydraulic pump, the hydraulic oil is supplied from the auxiliary hydraulic pump 3A to the hydraulic actuator 36. When the hydraulic oil is supplied from the auxiliary hydraulic pump 3A to the hydraulic actuator 36 and the hydraulic actuator 36 is operated, the relative position between the wheel 31 and the crawler belt 32 is adjusted even if an abnormality occurs in the main hydraulic pump.

  Further, the hydraulic oil is supplied from the auxiliary hydraulic pump 3A to the boom cylinder 15 and the boom cylinder 15 is operated, so that the position of the main boom 11 is adjusted even if an abnormality occurs in the main hydraulic pump.

[Support mechanism]
FIG. 6 is a view showing a support mechanism 90 capable of supporting the operation member 6 according to the present embodiment. For example, in a normal state where the main hydraulic pump is normal and the auxiliary hydraulic pump 3 </ b> A is not operated, the operation member 6 is supported by a support mechanism 90 provided in at least a part of the hydraulic excavator 1. In the present embodiment, the support mechanism 90 is provided on the track frame 35 on the left side of the center frame 33. The support mechanism 90 detachably supports the operation member 6. The support mechanism 90 supports the operation member 6 so that the longitudinal direction of the operation member 6 and the front-rear direction of the excavator 1 are parallel to each other.

  In the present embodiment, the support mechanism 90 includes a first support member 91 provided at the front portion of the track frame 35 on the left side of the center frame 33, and a first support member provided at the rear portion of the track frame 35 relative to the first support member 91. 2 support members 92. The first support member 91 includes a clamp member that sandwiches one end portion 6 </ b> A of the operation member 6. The second support member 92 has an opening into which the other end portion 6B of the operation member 6 is inserted. Each of the first support member 91 and the second support member 92 is provided on the surface (left side surface) of the left track frame 35.

  When the operation member 6 is supported by the support mechanism 90, the operator inserts the other end 6 </ b> B of the operation member 6 into the opening of the second support member 92, and then inserts the one end 6 </ b> A of the operation member 6 into the first support member 91. Between. When removing the operation member 6 from the support mechanism 90, the operator releases the support of the one end 6 </ b> A of the operation member 6 by the first support member 91, and then connects the other end 6 </ b> B of the operation member 6 to the second support member 92. Pull out from the opening.

  Note that the support mechanism 90 is not limited to the structure shown in FIG. 6 as long as the operation member 6 can be detachably supported.

[Coupling mechanism]
FIG. 7 is a perspective view showing a part of the excavator 1 according to the present embodiment, and corresponds to a view of the excavator 1 viewed from the left rear. FIG. 8 is a plan view showing a part of the excavator 1 according to the present embodiment.

  In the present embodiment, the operation member 6 is used as an auxiliary tool when the tilt floor 24 is tilted up.

  As shown in FIGS. 7 and 8, the hydraulic excavator 1 includes a connection mechanism 100 (first connection mechanism) provided at the rear portion of the cab 22 and detachably connected to one end portion 6 </ b> A of the rod-like operation member 6. . In the present embodiment, the coupling mechanism 100 is provided at the left rear end of the cab 22.

  As shown in FIG. 8, the other end 6 </ b> B of the operation member 6 is disposed outside the lower traveling body 30 in a state where the one end 6 </ b> A of the operation member 6 is connected to the connection mechanism 100. In the present embodiment, the other end 6 </ b> B of the operation member 6 is arranged on the left side of the lower traveling body 30 in a state where the end 6 </ b> A of the operation member 6 is connected to the connection mechanism 100. FIG. 8 shows a state in which the boom rotation axis AX1 and the rotation axis DX of the drive wheel 37 of the lower traveling body 30 are parallel to each other. The boom rotation axis AX1 and the rotation axis DX of the drive wheel 37 are parallel, and the other end 6B of the operation member 6 is connected to the lower traveling body 30 in a state where the end 6A of the operation member 6 is connected to the connection mechanism 100. It is arranged on the left side.

  As shown in FIG. 7, the other end 6 </ b> B of the operating member 6 is disposed below the one end 6 </ b> A of the operating member 6 in a state where the end 6 </ b> A of the operating member 6 is connected to the connecting mechanism 100. The

  That is, the operation member 6 is configured so that the other end portion 6B of the connecting member 6 protrudes to the left of the left end portion of the lower traveling body 30 in a state where the boom rotation axis AX1 and the rotation axis DX of the drive wheel 37 are parallel. And the other end part 6B is connected to the connection mechanism 100 so as to be disposed below the one end part 6A.

  FIG. 9 is a view showing the coupling mechanism 100 according to the present embodiment. 9A is a view of the connection mechanism 100 as viewed from above, FIG. 9B is a view of the connection mechanism 100 as viewed from the rear, and FIG. 9C is a view of the connection mechanism 100 as viewed from the right. It is the figure seen from the direction.

  As shown in FIG. 9, the coupling mechanism 100 includes a plate-like member 101 connected to the rear surface of the cab 22 and a cylindrical member 102 fixed to the plate-like member 101. The cylindrical member 102 has a hole 103 into which the one end portion 6A of the operation member 6 is inserted.

  The plate-like member 101 is fixed to the rear surface of the cab 22 by a fixing member such as a bolt. In the present embodiment, a bracket 150 (see FIGS. 7 and 8) is fixed to the rear surface of the cab 22. As shown in FIGS. 9A and 9C, the bracket 150 has a pair of leg portions 150A fixed to the rear surface of the cab 22, and a plate portion 150B fixed to the pair of leg portions 150A. . The pair of leg portions 150A are separated in the vehicle width direction. The plate portion 150B is disposed between the pair of leg portions 150A. In a state where the leg portion 150A is fixed to the rear surface of the cab 22, the rear surface of the cab 22 and the plate portion 150B of the bracket 150 face each other with a gap therebetween. The plate-like member 101 is fixed to the plate portion 150B of the bracket 150. In the present embodiment, the plate-like member 101 is fixed to the left rear end portion of the cab 22 via the bracket 150.

  The cylindrical member 102 has a hole 103 into which the one end portion 6A of the operation member 6 is inserted. In a state where the plate-like member 101 is fixed to the cab 22, the central axis of the tubular member 102 extends left rearward and downward. As a result, the operation member 6 inserted into the hole 103 extends left rearward and downward.

  The connection mechanism 100 has the same structure as the connection mechanism 3B of the auxiliary hydraulic pump 3A. The diameter of the hole 103 of the connection mechanism 100 is equal to the diameter of the hole 3C of the cylindrical member of the connection mechanism 3B. One end 6A of the operating member 6 can be connected to each of the connecting mechanism 100 and the connecting mechanism 3B.

[Operation]
FIG. 10 is a diagram illustrating an example of the operation of the excavator 1 according to the present embodiment. As shown in FIG. 10, the excavator 1 has a tilt floor 24 that can be tilted. The tilt floor 24 tilts forward. By tilting the tilt floor 24 forward, the cab 22 including the tilt floor 24 tilts forward. For example, in the maintenance work of the hydraulic excavator 1, the cab 22 including the tilt floor 24 is tilted forward, and the maintenance work of the main device 2 disposed in the accommodation space 28 of the upper swing body 20 is performed.

  When the tilt floor 24 is tilted forward, the operator removes the operation member 6 from the support mechanism 90 and connects the one end 6 </ b> A of the operation member 6 and the connection mechanism 100. The support mechanism 90 is provided on the left track frame 35, and the coupling mechanism 100 is provided on the left rear end of the cab 22. That is, both the support mechanism 90 and the coupling mechanism 100 are provided on the left side of the excavator 1 in the vehicle width direction. Therefore, when the operation member 6 is removed from the support mechanism 90 and connected to the connection mechanism 100, the movement distance of the operator is suppressed. Therefore, the operator can remove the operation member 6 from the support mechanism 90 and connect it to the connection mechanism 100 with good workability.

  When starting to tilt up the tilt floor 24, the operator releases the lock between the tilt floor 24 and the vehicle body frame 21. After the lock between the tilt floor 24 and the vehicle body frame 21 is released, the operator holds the operation member 6 connected to the connection mechanism 100 and lifts the operation member 6. One end 6 </ b> A of the operation member 6 is connected to the connection mechanism 100, and the operator lifts the operation member 6 while holding the other end 6 </ b> B of the operation member 6. As the operating member 6 is lifted, the tilt up of the tilt floor 24 is started.

  Since the distance between the tilt axis BX of the tilt mechanism 23 and the other end 6B of the operation member 6 is long, a large moment is generated when the other end 6B of the operation member 6 is operated. The operator can tilt up the tilt floor 24 by operating the other end 6 </ b> B of the operation member 6 with a smaller force than directly lifting the cab 22.

  As described above, the tilt floor 24 is tilted within a specified tilt range. In FIG. 10, a solid line indicates a tilt-down state in which the tilt floor 24 is disposed at the lower end portion of the tilt range, and a dotted line indicates a tilt-up state in which the tilt floor 24 is disposed at the upper end portion of the tilt range. The operator operates the operation member 6 while holding the other end portion 6B of the operation member 6 so as to change from the tilt-down state to the tilt-up state.

  As shown in FIG. 10, when the tilt floor 24 is tilted, the movement amount Eb of the other end portion 6B of the operation member 6 in the front-rear direction is smaller than the movement amount Ea of the rear end portion of the cab 22. That is, when the cab 22 changes from the tilt-down state to the tilt-up state, the movement amount Eb of the other end portion 6B of the operation member 6 in the front-rear direction is equal to that of the one end portion 6A (connection mechanism 100) of the operation member 6 in the front-back direction. It is smaller than the movement amount Ea.

  Further, as shown in FIG. 10, in the present embodiment, the tilt floor 24 is disposed at the lower end of the tilt range, and the tilt down state in which the tilt floor 24 is disposed at the upper end of the tilt range. In both cases, the other end 6 </ b> B of the operation member 6 is disposed below the one end 6 </ b> A of the operation member 6. The tilt range and the tilt angle of the central axis of the cylindrical member 102 are determined so that the other end 6B is disposed below the one end 6A in both the tilt-down state and the tilt-up state.

  When the tilt floor 24 is tilted up and maintenance work is finished, when the tilt floor 24 is tilted down, the operator holds the other end portion 6B of the operation member 6 and lowers it downward. As a result, the tilt floor 24 changes from the tilt-up state to the tilt-down state. In addition, when changing the tilt floor 24 from the tilt-up state to the tilt-down state, the operator may hold the rear end portion of the cab 22 and tilt it down without using the operation member 6.

[effect]
As described above, according to the present embodiment, the rod-like operation member 6 is used as an auxiliary tool when the cab 22 including the tilt floor 24 is tilted up. A connection mechanism 100 to which one end 6 </ b> A of the operation member 6 is connected is provided at the left rear end of the cab 22. By using the rod-shaped operation member 6, when the cab 22 is tilted up, the operator can generate a large moment with a small force. Therefore, the physical burden on the operator in the movement of the tilt floor 24 is reduced.

  As described above, the track-and-land hydraulic excavator 1 having the wheels 31 and the crawler belts 32 is equipped with more emergency or auxiliary auxiliary devices 3 than the land-specific hydraulic excavator 1. The cab 22 is equipped with an operating device or a control panel for operating the emergency or auxiliary auxiliary equipment 3. Therefore, the weight of the cab 22 of the hydraulic excavator 1 for track and land use is larger than the weight of the cab of the excavator dedicated to land. Accordingly, the physical burden on the operator when the tilt floor 24 is lifted in the track-and-land hydraulic excavator 1 is further increased. In the present embodiment, a connection mechanism 100 to which one end 6 </ b> A of the operation member 6 is connected is provided at the left rear end of the cab 22. Therefore, the operator can easily tilt up the heavy cab 22 by operating the operation member 6 connected to the connection mechanism 100.

  In the present embodiment, the other end 6 </ b> B of the operating member 6 is arranged on the left side of the left end of the lower traveling body 30 in a state where the one end 6 </ b> A of the operating member 6 is connected to the connecting mechanism 100. . As a result, the operator can operate the operation member 6 with good operability while standing on the left side of the lower traveling body 30. In addition, the operator can operate the operation member 6 while viewing the front in a state of standing on the left side of the lower traveling body 30.

  In a state where the one end portion 6A of the operation member 6 is connected to the connection mechanism 100, the other end portion 6B of the operation member 6 is disposed below the one end portion 6A of the operation member 6. Thereby, even an operator with a short height can hold the other end 6B of the operation member 6 and operate the operation member 6 smoothly.

  In the tilt of the tilt floor 24 within the specified tilt range, the movement amount Eb of the other end portion 6B of the operation member 6 in the front-rear direction is larger than the movement amount Eb of the rear end portion of the cab 22 (one end portion 6A of the operation member 6). small. Thereby, when the tilt floor 24 is tilted up, the distance that the operator moves forward is shortened. The operator can tilt up the tilt floor 24 only by bending and extending with the other end 6B of the operation member 6 held or by extending the arm upward without moving forward. When the operation member 6 does not exist, the operator needs to lift the cab 22 while holding the rear end of the cab 22 and walking forward. In this case, workability is low and the physical burden on the worker is large. By using the operation member 6, the operator can easily tilt up the tilt floor 24 in a state where the forward moving distance is suppressed.

  In both the tilt-down state in which the tilt floor 24 is disposed at the lower end of the tilt range and the tilt-up state in which the tilt floor 24 is disposed at the upper end of the tilt range, the other end 6B of the operation member 6 is 6 is disposed below one end portion 6A of 6. Thereby, even an operator with a short height can hold the other end 6B of the operation member 6 and smoothly change the tilt floor 24 from one of the tilt-down state and the tilt-up state to the other.

  The operating member 6 can also be connected to the connecting mechanism 3B of the auxiliary hydraulic pump 3A. By using the operation member 6 for operating the auxiliary hydraulic pump 3A as a tilt-up auxiliary tool, the number of members mounted on the hydraulic excavator 1 can be reduced.

  In normal operation, the operation member 6 is supported by a support mechanism 90 provided on the left track frame 35 of the center frame 33. Since both the support mechanism 90 and the connection mechanism 100 are provided on the left side of the excavator 1 in the vehicle width direction, when the operation member 6 is detached from the support mechanism 90 and connected to the connection mechanism 100, the movement distance of the operator is suppressed. Is done. Therefore, the operator can remove the operation member 6 from the support mechanism 90 and connect it to the connection mechanism 100 with good workability.

[Other Embodiments]
FIG. 11 is a diagram illustrating a first modification of the tubular member 102 according to the present embodiment. As shown in FIG. 11, a notch 104 is provided in a part of the cylindrical member 102. The notch 104 includes a straight portion 104A formed at one end of the tubular member 102 that defines the opening of the tubular member 102, and a hook portion 104B connected to the straight portion 104A. 104 A of straight parts are formed in parallel with the central axis of the cylindrical member 102 so that the one end part of the cylindrical member 102 may be included. The hook portion 104 </ b> B extends in the rotation direction around the central axis of the tubular member 102. A pin member 6 </ b> P is provided at one end 6 </ b> A of the operation member 6. The pin member 6P is fixed to the outer surface of the operation member 6. The pin member 6P is fixed to the outer surface of the operation member 6 so as to protrude from the outer surface of the operation member 6 in a radial direction with respect to the central axis of the operation member 6. When connecting the connecting mechanism 100 and the operation member 6, the pin member 6 </ b> P is inserted into the notch 104. One end portion 6A of the operation member 6 is inserted into the hole 103 in a state where the pin member 6P is disposed in the straight portion 104A. By inserting one end portion 6A of the operation member 6 into the hole 103, the pin member 6P slides on the straight portion 104A while being guided by the straight portion 104A. After the pin member 6P is disposed at the other end of the straight portion 104A, the operation member 6 is rotated in one direction, whereby the pin member 6P is disposed at the hook portion 104B. By disposing the pin member 6P in the hook portion 104B, the one end portion 6A of the operation member 6 is prevented from coming out of the hole 103. That is, in the present embodiment, the cutout portion 104 and the pin member 6P function as a retaining mechanism that prevents the one end portion 6A of the operation member 6 from coming out of the hole 103. When the connection between the coupling mechanism 100 and the operation member 6 is released, the operation member 6 is rotated in the reverse direction so that the pin member 6P disposed on the hook portion 104B is disposed on the straight portion 104A. After the pin member 6P is disposed on the straight portion 104A, the connection between the connection mechanism 100 and the operation member 6 is released by pulling out the one end portion 6A of the operation member 6 from the hole 103.

  FIG. 12 is a view showing a second modification of the tubular member 102 according to the present embodiment. As shown in FIG. 11, a screw thread 107 is provided on the outer surface of the one end portion 6 </ b> A of the operation member 6, and a screw groove 108 is provided on the inner surface of the cylindrical member 102. The screw thread 107 and the screw groove 108 can be coupled. When the connection mechanism 100 and the operation member 6 are connected, the operation member 6 is rotated in one direction with the thread 107 and the screw groove 108 engaged with each other. As a result, the one end portion 6A of the operation member 6 is screwed into the hole 103, and the screw thread 107 and the screw groove 108 are coupled. The coupling between the screw thread 107 and the screw groove 108 prevents the one end portion 6 </ b> A of the operation member 6 from coming out of the hole 103. That is, in the present embodiment, the screw thread 107 and the screw groove 108 function as a retaining mechanism that suppresses the one end portion 6 </ b> A of the operation member 6 from slipping out of the hole 103. When the connection between the coupling mechanism 100 and the operation member 6 is released, the operation member 6 is rotated in the reverse direction so that the coupling between the screw thread 107 and the screw groove 108 is released. As a result, the one end 6A of the operation member 6 is pulled out from the hole 103, and the connection between the connection mechanism 100 and the operation member 6 is released.

  In the above-described embodiment, the coupling mechanism 100 is fixed to the left rear end portion of the cab 22 via the bracket 150. The bracket 150 may be omitted. That is, the plate-like member 101 of the coupling mechanism 100 may be directly fixed to the cab 22. Further, the plate-like member 101 may be omitted, and the tubular member 102 may be fixed to the bracket 150 or directly to the cab 22.

  In the above-described embodiment, the coupling mechanism 100 may be provided at the right rear end portion of the cab 22. Further, the other end 6 </ b> B of the operation member 6 may be disposed on the right side of the lower traveling body 30 in a state where the one end 6 </ b> A of the operation member 6 is connected to the connection mechanism 100.

  In the above-described embodiment, the support mechanism 90 is provided on the track frame 35 on the left side of the center frame 33. The support mechanism 90 may be provided on the right track frame 35 of the center frame 33, or may be provided on both the left track frame 35 and the right track frame 35 of the center frame 33.

  In the above-described embodiment, the coupling mechanism 100 includes the cylindrical member 102, and the one end 6 </ b> A of the operation member 6 is inserted into the hole of the cylindrical member 102. The coupling mechanism 100 may include a convex member that protrudes from the left rear end of the cab 22. The operation member 6 may have a concave portion into which the convex member is inserted.

  In the above-described embodiment, the operation member 6 may not be a straight shape, and at least a part thereof may be bent.

  In the above-described embodiment, the work vehicle 1 is a track and land combined hydraulic excavator. The work vehicle 1 may be a standard on-shore hydraulic excavator.

  In each of the embodiments described above, the work vehicle is a hydraulic excavator, but is not limited to a hydraulic excavator. The operation member 6 and the coupling mechanism 100 described in the above embodiment can be applied to all work vehicles including a tilt floor.

  DESCRIPTION OF SYMBOLS 1 ... Hydraulic excavator (work vehicle), 2 ... Main equipment, 3 ... Auxiliary equipment, 3A ... Auxiliary hydraulic pump, 3B ... Connection mechanism (2nd connection mechanism), 3C ... Hole, 6 ... Operation member, 6A ... One end part, 6B ... the other end, 6P ... the pin member, 10 ... the working machine, 11 ... the main boom, 12 ... the offset boom, 13 ... the arm, 14 ... the bucket (attachment), 15 ... the boom cylinder, 16 ... the offset cylinder, 17 ... the arm Cylinder, 18 ... Bucket cylinder, 20 ... Upper turning body (vehicle main body), 21 ... Body frame, 22 ... Cab, 23 ... Tilt mechanism, 24 ... Tilt floor, 25 ... Post, 26 ... Canopy, 27 ... Windshield, 28 ... accommodating space, 30 ... lower traveling body (traveling device), 31 ... wheel, 32 ... crawler belt, 33 ... center frame, 34 ... movable frame, 35 ... track frame 36 ... hydraulic actuator 37 ... drive wheel 60 ... case member 61 ... lid 90 ... support mechanism 91 ... first support member 92 ... second support member 100 ... connection mechanism (first connection mechanism) DESCRIPTION OF SYMBOLS 101 ... Plate-like member 102 ... Cylindrical member 103 ... Hole 104 ... Notch 104A ... Straight part 104B ... Hook part 107 ... Screw thread 108 ... Screw groove 150 ... Bracket 150A ... Leg part , 150B: Plate portion, AX2: Arm rotation axis, AX3: Bucket rotation axis, DX: Rotation axis, RX: Swivel axis.

Claims (5)

A traveling device for supporting the body frame;
A cab including a tilt floor supported to be tiltable on the vehicle body frame via a tilt mechanism provided at a front portion of the vehicle body frame;
A first coupling mechanism provided at a rear portion of the cab and detachably coupled to one end of a rod-shaped operation member;
In a state where the operation member is connected to the first connection mechanism, the other end portion of the operation member is disposed outside the traveling device.
Work vehicle. In a state where the operation member is connected to the first connection mechanism, the other end portion of the operation member is disposed below one end portion of the operation member.
The work vehicle according to claim 1. The tilt floor is tilted within a specified tilt range,
In the tilt of the tilt floor, the movement amount of the other end portion of the operation member in the front-rear direction is smaller than the movement amount of the rear end portion of the cab.
The work vehicle according to claim 1 or claim 2. A hydraulic pump that has a second coupling mechanism that is detachably coupled to one end of the operating member, and that is operated by operating the operating member;
The work vehicle according to any one of claims 1 to 3. The travel device includes a center frame that supports the vehicle body frame in a turnable manner, and a track frame that is disposed on each of the left and right sides of the center frame and supports a crawler track.
A support mechanism provided on the track frame and capable of supporting the operation member;
The work vehicle according to any one of claims 1 to 4.