Work vehicle

Abstract

In a work vehicle whose wheels are driven by a hydraulic motor, the hydraulic hose from the hydraulic pump mounted on the machine is connected to the hydraulic motor with minimal damage. [Solution] The system includes a steering member 26, a wheel 19 supported by the steering member 26, a hydraulic motor 27, and a first hydraulic hose 10 capable of supplying hydraulic fluid from a hydraulic pump to the hydraulic motor 27. The first hydraulic hose 10 is fixed to the first fixing member 41 and has a first portion 11 that extends from the first fixing member 41 along the support arms 8 and 9 toward the opposite side from the steering member 26, a second portion 12 that extends from the first portion 11 in the opposite direction along the support arms 8 and 9 toward the steering member 26, and a third portion 13 that extends from the second portion 12 toward the hydraulic motor 27, is fixed to the second fixing member 42 and connected to the hydraulic motor 27.

Description

Technical Field

[0001] The present invention relates to a work vehicle in which traveling wheels are driven by a hydraulic motor.

Background Art

[0002] In the work vehicle disclosed in Patent Document 1, support arms are attached to a plurality of locations on a machine body equipped with a hydraulic pump, and a wheel and a hydraulic motor that drives the wheel are supported at the ends of the support arms.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the work vehicle as described above, it has been proposed to attach a steering member to the end of a support arm so as to be steerable around a steering axis along the vertical direction, and to attach a wheel and a hydraulic motor to the steering member. By steering the steering member with respect to the support arm, the traveling direction of the work vehicle can be changed. In this work vehicle, when connecting a hydraulic hose from a hydraulic pump mounted on the machine body to a hydraulic motor, it is necessary to reduce damage to the hydraulic hose.

[0005] An object of the present invention is to configure a work vehicle in which traveling wheels are driven by a hydraulic motor so that a hydraulic hose from a hydraulic pump mounted on the machine body can be connected to the hydraulic motor with less damage.

Means for Solving the Problems

[0006] The work vehicle of the present invention comprises a machine body equipped with a hydraulic pump, support arms attached to multiple locations on the machine body, steering members supported at the ends of the support arms so as to be steerable around a steering axis along the vertical direction, wheels for driving supported by the steering members, a hydraulic motor supported by the steering members and capable of driving the wheels, a first hydraulic hose capable of supplying hydraulic fluid from the hydraulic pump to the hydraulic motor, a first fixing member provided at a position above the support arms, and a second fixing member provided on the steering members, wherein the first hydraulic hose has a first portion fixed to the first fixing member and extending from the first fixing member toward the opposite side from the steering member, a second portion whose extension direction is reversed from the first portion of the first hydraulic hose and extends along the support arms toward the steering member, and a third portion extending from the second portion of the first hydraulic hose toward the hydraulic motor, fixed to the second fixing member and connected to the hydraulic motor.

[0007] According to the present invention, in a support arm attached to a machine body equipped with a hydraulic pump, a steering member is supported at the end of the support arm so as to be steerable around a steering axis along the vertical direction, and a wheel and a hydraulic motor are supported on the steering member. A first fixing member is provided at an upper position relative to the support arm, and a second fixing member is provided on the steering member.

[0008] According to the present invention, the first hydraulic hose is fixed to a first fixing member and extends from the first fixing member toward the opposite side from the steering member (first portion of the first hydraulic hose). The first hydraulic hose has its extension direction reversed from the first portion of the first hydraulic hose and extends along the support arm toward the steering member (the second portion of the first hydraulic hose). The first hydraulic hose extends from its second portion toward the hydraulic motor, is fixed to a second fixing member, and is connected to the hydraulic motor (the third portion of the first hydraulic hose).

[0009] As a result, the second portion of the first hydraulic hose is configured to be long, extending from near the end of the support arm opposite the steering member to near the end of the support arm on the steering member side. By configuring the second portion of the first hydraulic hose to be longer, even when the steering member is steered and the orientation of the second portion of the first hydraulic hose changes in accordance with the steering member, the swing of the second portion of the first hydraulic hose (the swing angle of the portion opposite to the steering member) remains small. By reducing the vibration of the second portion of the first hydraulic hose (the vibration angle of the portion opposite the steering member), contact between the first hydraulic hose and other objects is reduced, and damage to the first hydraulic hose due to repeated vibration is minimized, thereby improving the durability of the first hydraulic hose.

[0010] In the present invention, it is preferable that the second portion of the first hydraulic hose is provided below the first fixing member.

[0011] According to the present invention, the second portion of the first hydraulic hose is reversed in direction from the first portion of the first hydraulic hose, with its extension direction changed downward, and its lower side extending toward the steering member along the support arm relative to the first fixing member. This allows the extension direction of the first hydraulic hose to be changed smoothly, and the first hydraulic hose extends along the support arm toward the steering member, which is advantageous in terms of improving the durability of the first hydraulic hose.

[0012] In the present invention, it is preferable that the system includes a steering cylinder attached across the support arm and the steering member, capable of steering the steering member relative to the support arm, and a second hydraulic hose capable of supplying hydraulic fluid from the hydraulic pump to the steering cylinder, wherein the second hydraulic hose is fixed to the first fixing member and has a first portion extending from the first fixing member toward the opposite side from the steering member, and a second portion whose extension direction is reversed from the first portion of the second hydraulic hose and connected to the steering cylinder.

[0013] According to the present invention, a steering cylinder is mounted across a support arm and a steering member, and the steering member is steered by the steering cylinder. According to the present invention, in the above configuration, the second hydraulic hose is fixed to the first fixing member and extends from the first fixing member along the support arm toward the opposite side from the steering member (first portion of the second hydraulic hose). The extension direction of the second hydraulic hose is reversed from the first portion of the second hydraulic hose and connected to the steering cylinder (second portion of the second hydraulic hose).

[0014] According to the present invention, the second hydraulic hose is positioned along the first hydraulic hose, and contact between the second hydraulic hose and other objects is reduced, thereby improving the durability of the second hydraulic hose.

[0015] In the present invention, it is preferable that the second portion of the second hydraulic hose is provided below the first fixing member.

[0016] According to the present invention, the second portion of the second hydraulic hose is reversed in direction from the first portion of the second hydraulic hose, with its extension direction changed downward, and is provided below the first fixing member. This allows the extension direction of the second hydraulic hose to be changed smoothly, and the second hydraulic hose is connected to the steering cylinder, which is advantageous in terms of improving the durability of the second hydraulic hose.

[0017] In the present invention, it is preferable that the second portion of the first hydraulic hose and the second portion of the second hydraulic hose are provided below the first fixing member, and the first portion of the first hydraulic hose is fixed to the portion of the first fixing member below the first portion of the second hydraulic hose.

[0018] According to the present invention, the second portion of the first hydraulic hose is reversed in direction from the first portion of the first hydraulic hose, with its extension direction changed downward, and its lower side extending toward the steering member along the support arm relative to the first fixing member. As a result, the extending direction of the first hydraulic hose is changed without difficulty, and the first hydraulic hose is extended along the support arm toward the steering member, which is advantageous in terms of improving the durability of the first hydraulic hose.

[0019] According to the present invention, the second portion of the second hydraulic hose is provided below the first fixing member while the extending direction is changed reversely while being changed downward from the first portion of the second hydraulic hose. As a result, the extending direction of the second hydraulic hose is changed without difficulty, and the second hydraulic hose is connected to the steering cylinder, which is advantageous in terms of improving the durability of the second hydraulic hose.

[0020] According to the present invention, as described above, when the first hydraulic hose and the second hydraulic hose are fixed to the first fixing member, in the first fixing member, the first portion of the first hydraulic hose is provided below the first portion of the second hydraulic hose. As a result, the first hydraulic hose and the second hydraulic hose are less likely to intersect in a side view, the second portion of the first hydraulic hose is extended along the support arm toward the steering member without difficulty, and the second portion of the second hydraulic hose is connected to the steering cylinder without difficulty, which is advantageous in terms of improving the durability of the first hydraulic hose and the second hydraulic hose.

[0021] In the present invention, it is preferable that a support member supported by the machine body is provided, an end portion of the support arm on the opposite side of the steering member is supported by a lower portion of the support member so as to be able to move up and down around a lifting and lowering axis along the horizontal direction, is attached across the support member and the support arm, a lifting and lowering cylinder capable of lifting and lowering the support arm with respect to the support member is provided, and the first fixing member is provided on a horizontal surface portion located above the steering cylinder in the support member.

[0022] According to the present invention, the support member is provided on the machine body, and an end portion of the support arm on the opposite side of the steering member is supported by a lower portion of the support member so as to be able to move up and down around a lifting and lowering axis along the horizontal direction. The lifting cylinder is attached across the support member and the support arm, and the height of the machine body from the ground is changed up and down by operating the support arm up and down by the lifting cylinder.

[0023] According to the present invention, the first fixing member is provided on the horizontal surface portion located above the steering cylinder in the support member. Thereby, when the first portion of the second hydraulic hose extends from the first fixing member toward the side opposite to the steering member, and the extending direction of the second portion of the second hydraulic hose is changed to the reverse direction from the first portion of the second hydraulic hose and is connected to the steering cylinder, the second portion of the second hydraulic hose can be connected to the steering cylinder without difficulty. Therefore, it is advantageous in terms of improving the durability of the second hydraulic hose.

[0024] According to the present invention, the bent portions between the first portion and the second portion of the first hydraulic hose and the bent portions between the first portion and the second portion of the second hydraulic hose are located near the lifting axis of the support arm.

[0025] Thereby, when the support arm is lifted and lowered by the lifting cylinder, in the bent portions of the first hydraulic hose and the second hydraulic hose described above, the degree of bending becomes larger or smaller, and the lifting and lowering operation of the support arm by the lifting cylinder can be performed without difficulty. When the support arm is lifted and lowered by the lifting cylinder, it is the degree to which the bending conditions of the first hydraulic hose and the second hydraulic hose change, and the sway of the first hydraulic hose and the second hydraulic hose is small. Therefore, the contact between the first hydraulic hose and the second hydraulic hose and other objects is reduced, which is advantageous in terms of improving the durability of the first hydraulic hose and the second hydraulic hose.

[0026] [[ID=第十九]] In the present invention, it is preferable that the lifting cylinder is provided along the horizontal surface portion on the side opposite to the horizontal surface portion where the first fixing member is provided in the support member.

[0027] According to the present invention, when the first fixing member is provided on the side surface of the support member located above the steering cylinder, the lifting cylinder for raising and lowering the support arm is provided along the side surface of the support member opposite to the side surface on which the first fixing member is provided. This reduces contact between the first and second hydraulic hoses (first fixing member) and the lifting cylinder, which is advantageous in terms of improving the durability of the first and second hydraulic hoses.

[0028] In the present invention, the upper part of the support member is supported by the machine body so as to be able to swing around a pivot axis along the horizontal direction, and is attached across the machine body and the support member, and is equipped with a pivot cylinder capable of pivoting the support member relative to the machine body, and a third fixing member provided above the pivot axis, and the first hydraulic hose is fixed to the third fixing member, extends from the third fixing member toward the steering member, has a fourth portion whose extension direction is changed toward the first fixing member, is fixed to the first fixing member and connected to the first portion of the first hydraulic hose.

[0029] According to the present invention, the upper part of the support member is supported by the machine body so as to be able to swing around a pivot axis along the horizontal direction. A swing cylinder is attached across the machine body and the support member, and the support member is oscillated by the swing cylinder.

[0030] According to the present invention, the third fixing member is provided above the pivot axis. The fourth portion of the first hydraulic hose is fixed to the third fixing member, extends from the third fixing member toward the steering member, has its extension direction changed toward the first fixing member, is fixed to the first fixing member, and is connected to the first portion of the first hydraulic hose.

[0031] According to the present invention, the bent portion of the fourth part of the first hydraulic hose is located near the pivot axis of the support member. As a result, when the support member is oscillated by the oscillating cylinder, the degree of curvature in the bent portion of the first hydraulic hose increases and decreases, allowing the oscillating operation of the support member by the oscillating cylinder to be performed smoothly. When the support member is oscillated by the oscillating cylinder, the degree of bending of the first hydraulic hose changes only slightly, and the vibration of the first hydraulic hose is small. This reduces contact between the first hydraulic hose and other objects, which is advantageous in terms of improving the durability of the first hydraulic hose.

[0032] In the present invention, it is preferable that the second hydraulic hose is fixed to the third fixing member, extends from the third fixing member toward the steering member, has a third portion whose extension direction is changed toward the first fixing member, is fixed to the first fixing member and connected to the first portion of the second hydraulic hose.

[0033] According to the present invention, the third portion of the second hydraulic hose is fixed to the third fixing member, extends from the third fixing member toward the steering member, has its extension direction changed toward the first fixing member, is fixed to the first fixing member, and is connected to the first portion of the second hydraulic hose.

[0034] According to the present invention, the bent portion of the third part of the second hydraulic hose is located near the pivot axis of the support member. As a result, when the support member is oscillated by the oscillating cylinder, the degree of curvature in the bent portion of the second hydraulic hose increases and decreases, allowing the oscillating operation of the support member by the oscillating cylinder to be performed smoothly. When the support member is oscillated by the oscillating cylinder, the degree of bending of the second hydraulic hose changes only slightly, and the vibration of the second hydraulic hose is small. This reduces contact between the second hydraulic hose and other objects, which is advantageous in terms of improving the durability of the second hydraulic hose. [Brief explanation of the drawing]

[0035] [Figure 1] This is a left side view of the work vehicle. [Figure 2] This is a plan view of the work vehicle. [Figure 3] This is a left side view of the area around the first and second support arms, steering members, etc., located on the right front of the aircraft. [Figure 4] This is a rear view of the area around the first and second support arms, steering members, etc., located on the right front of the aircraft. [Figure 5] This is a front view of the area around the first and second support arms, steering members, etc., located on the right front of the aircraft. [Figure 6] This is a plan view of the area around the first and second support arms, steering members, etc., located on the right front of the aircraft. [Modes for carrying out the invention]

[0036] Figures 1 to 6 show remotely operated and autonomous work vehicles. In Figures 1 to 6, F indicates forward, B indicates backward, U indicates upward, D indicates downward, R indicates right, and L indicates left.

[0037] (Overall configuration of the work vehicle) As shown in Figures 1 and 2, a machine body 1 is provided, which is constructed by connecting frames (not shown) in a frame-like manner, and a cargo platform 2 for loading cargo is provided on the upper part of the machine body 1. An engine 3 and a hydraulic pump 4 are provided at the lower front part of the machine body 1, and the hydraulic pump 4 is driven by the engine 3. Four control valve units 5 are provided on the right and left upper parts of the machine body 1, and the hydraulic fluid from the hydraulic pump 4 is supplied to the control valve units 5.

[0038] Flat right and left covers 25 are provided on the right and left sides of the engine 3, extending along the front-rear and up-down directions, across the front and rear ends of the aircraft body 1. The right and left lateral sides of the engine 3 and the right lateral side of the hydraulic pump 4 are covered by the covers 25.

[0039] Four sets of first support arms 6,7 (corresponding to support members) and second support arms 8,9 (corresponding to support arms) are provided on the right front and left front, right rear and left rear of the machine body 1, and the wheels 19 for running are supported at the ends of the second support arms 8,9. The machine body 1 is supported by the four sets of first support arms 6,7 and second support arms 8,9 and the wheels 19.

[0040] The first support arms 6,7 and second support arms 8,9 on the right front, and the first support arms 6,7 and second support arms 8,9 on the left front, have a symmetrical configuration. The first support arms 6,7 and second support arms 8,9 on the right rear, and the first support arms 6,7 and second support arms 8,9 on the left rear, also have a symmetrical configuration.

[0041] The first support arms 6,7 and second support arms 8,9 on the front right, and the first support arms 6,7 and second support arms 8,9 on the rear right, have a front-to-back symmetrical configuration. The first support arms 6,7 and second support arms 8,9 on the front left, and the first support arms 6,7 and second support arms 8,9 on the rear left, also have a front-to-back symmetrical configuration.

[0042] (Configuration of the first support arm) Of the four sets of first support arms 6, 7 and second support arms 8, 9, the first support arms 6, 7 of the right front set of first support arms 6, 7 and second support arms 8, 9 will be described below based on Figures 3 to 6.

[0043] As shown in Figures 3 to 6, a pair of support brackets 15 and 16 are connected to the upper right front part of the aircraft body 1 and extend downward, and a pivot shaft 17 is connected along the left-right direction across the lower part of the support brackets 15 and 16.

[0044] A pair of flat first support arms 6 and 7 are provided, and a round pipe-shaped pivot point 6a is connected across the upper parts of the first support arms 6 and 7. The pivot points 6a of the first support arms 6 and 7 are rotatably attached to a pivot axis 17, and the upper parts of the first support arms 6 and 7 are supported so as to be able to swing back and forth around an axis P1 (corresponding to the pivot axis) that is aligned in the left-right direction (corresponding to the horizontal direction).

[0045] A pair of brackets 18 are connected to the right and left sides of the pivot axis 17 and extend toward the rear (towards the front-to-rear center of the machine body 1). A double-acting first hydraulic cylinder 31 (corresponding to an oscillating cylinder) is mounted across the brackets 18 and the lower parts of the first support arms 6 and 7, and is located between the first support arms 6 and 7 in both plan and rear views.

[0046] When the first hydraulic cylinder 31 is retracted, the first support arms 6 and 7 are swung backward relative to the machine body 1 (towards the front-to-rear center of the machine body 1). When the first hydraulic cylinder 31 is extended, the first support arms 6 and 7 are swung forward relative to the machine body 1.

[0047] With the above configuration, the aircraft body 1 is equipped with first support arms 6 and 7 (support members) supported by it, as shown in Figures 3 to 6. The upper parts of the first support arms 6 and 7 (support members) are supported by the machine body 1 so as to be able to swing around an axis P1 (oscillating axis) that is aligned in the left-right direction (horizontal direction). A first hydraulic cylinder 31 (oscillating cylinder) is attached to the aircraft body 1 and the first support arms 6 and 7 (support members), and is capable of oscillating the first support arms 6 and 7 (support members) relative to the aircraft body 1.

[0048] (Configuration of the second support arm) Of the four sets of first support arms 6, 7 and second support arms 8, 9, the second support arms 8, 9 of the right front set of first support arms 6, 7 and second support arms 8, 9 will be described below based on Figures 3 to 6.

[0049] As shown in Figures 3 to 6, a pair of second support arms 8 and 9, shaped like flattened round pipes, are provided, and a pivot shaft 8a is connected across the rear of the second support arms 8 and 9. A round pipe-shaped pivot portion 6b is connected across the lower part of the first support arms 6 and 7, and the pivot shaft 8a of the second support arms 8 and 9 is rotatably attached to the pivot portion 6b of the first support arms 6 and 7.

[0050] As a result, the rear portions of the second support arms 8 and 9 are supported at the lower part of the first support arms 6 and 7 so that they can move up and down around an axis P2 (corresponding to the lifting axis) that is aligned in the left-right direction (corresponding to the horizontal direction), and the second support arms 8 and 9 extend forward from the lower part of the first support arms 6 and 7. The auxiliary wheels 24 are supported at the pivot axis 8a of the second support arms 8 and 9, on the portion laterally outward relative to the second support arm 9, so that they can rotate freely.

[0051] A pivot shaft 8b is connected across the rear of the second support arms 8 and 9. A double-acting second hydraulic cylinder 32 (corresponding to a lifting cylinder) is mounted across the front upper part of the first support arms 6 and 7 and the pivot shaft 8b of the second support arms 8 and 9. The second hydraulic cylinder 32 is located between the first support arms 6 and 7 and between the second support arms 8 and 9 in both plan and front views, and is located in front of the first hydraulic cylinder 31.

[0052] When the second hydraulic cylinder 32 is retracted, the second support arms 8 and 9 are swung upward relative to the first support arms 6 and 7. When the second hydraulic cylinder 32 is extended, the second support arms 8 and 9 are swung downward relative to the first support arms 6 and 7.

[0053] With the above configuration, as shown in Figures 3 to 6, the machine body 1 is equipped with a hydraulic pump 4, and the machine body 1 is fitted with second support arms 8 and 9 (support arms) attached to multiple locations. The opposite ends of the steering members 26 on the second support arms 8 and 9 (support arms) are supported on the lower part of the first support arms 6 and 7 (support members) so that they can move up and down around the axis P2 (lifting axis) which is aligned in the left-right direction (horizontal direction). A second hydraulic cylinder 32 (lifting cylinder) is attached across the first support arms 6, 7 (support members) and the second support arms 8, 9 (support arms), and is capable of raising and lowering the second support arms 8, 9 (support arms) relative to the first support arms 6, 7 (support members).

[0054] (Structure of steering members) The steering member 26 attached to the second support arm 8,9 of the right front pair of first support arm 6,7 and second support arm 8,9, among the four pairs of first support arms 6,7 and second support arms 8,9, will be described below with reference to Figures 3 to 6.

[0055] As shown in Figures 3 to 6, a transverse frame 8c is connected across the front of the second support arms 8 and 9. The steering member 26 is supported on the left and right central portions of the transverse frame 8c of the second support arms 8 and 9, so that it can be steered around the axis P3 in the vertical direction.

[0056] The wheel 19 is rotatably supported on the right lateral outer portion of the steering member 26. The hydraulic motor 27 is supported on the left and right central portion of the machine body 1 on the steering member 26, and the wheel 19 is rotated forward and backward by the hydraulic motor 27.

[0057] A bracket 8d is connected to the left-right central portion of the aircraft body 1 at the rear of the second support arm 8, and a bracket 26a is connected to the left-right central portion of the aircraft body 1 at the upper part of the steering member 26.

[0058] A double-acting third hydraulic cylinder 33 (corresponding to a steering cylinder) is mounted across the bracket 26a of the steering member 26 and the bracket 8d of the second support arms 8 and 9. In a plan view, the third hydraulic cylinder 33 is located on the left-right center side of the machine body 1 relative to the second support arm 8 and is mounted along the second support arm 8. By extending and retracting the third hydraulic cylinder 33, the steering member 26 is steered left and right relative to the second support arms 8 and 9.

[0059] With the above configuration, as shown in Figures 3 to 6, a steering member 26 is provided, supported at the ends of the second support arms 8 and 9 (support arms), so as to be steerable around an axis P3 (steering axis) along the vertical direction. A wheel 19 for driving is provided, supported by the steering member 26. A hydraulic motor 27 is provided, supported by the steering member 26 and capable of driving the wheel 19. A third hydraulic cylinder 33 (steering cylinder) is attached to the second support arms 8, 9 (support arms) and the steering member 26, and is capable of steering the steering member 26 relative to the second support arms 8, 9 (support arms).

[0060] (Configuration of hydraulic hoses that supply hydraulic fluid to the first and second hydraulic cylinders) Of the four sets of first support arms 6, 7 and second support arms 8, 9, the hydraulic hoses 28, 29 connected to the first hydraulic cylinder 31 and the second hydraulic cylinder 32 of the right front first support arm 6, 7 and second support arm 8, 9 will be described below based on Figures 3 to 6.

[0061] As shown in Figures 3 to 6, the control valve unit 5 is located rearward (towards the front-to-rear center of the machine body 1) relative to the pivot axis 17 and is positioned at approximately the same height as the pivot axis 17. A pair of flexible hydraulic hoses 28 extend forward from the lower part of the control valve unit 5 and are connected to the first hydraulic cylinder 31 while bending.

[0062] The third fixing member 43 is attached to the lateral surface of the support bracket 15 on the side of the support bracket 16. A pair of flexible hydraulic hoses 29 extend forward from the lower part of the control valve unit 5 and upward and are fixed to the lower part of the third fixing member 43, and are provided between the support brackets 15 and 16.

[0063] The hydraulic hose 29 extends forward from the third fixing member 43 and downward, and is connected to the second hydraulic cylinder 32. The bent portion 29a of the hydraulic hose 29 is located in front of the pivot axis 17 (axis P1) and is at approximately the same height as the pivot axis 17 (axis P1).

[0064] The hydraulic fluid from the hydraulic pump 4 is supplied to the control valve unit 5, and from the control valve unit 5, it is supplied and discharged to the first hydraulic cylinder 31 and the second hydraulic cylinder 32 via hydraulic hoses 28 and 29, causing the first hydraulic cylinder 31 and the second hydraulic cylinder 32 to extend and retract.

[0065] (Configuration of hydraulic hoses that supply hydraulic fluid to the hydraulic motor) - 1 Of the four sets of first support arms 6, 7 and second support arms 8, 9, the hydraulic hoses 10 (corresponding to the first hydraulic hose) connected to the hydraulic motor 27 of the right front first support arm 6, 7 and second support arm 8, 9 will be described below based on Figures 3 to 6.

[0066] As shown in Figures 3 to 6, the first fixing member 41 is attached to the upper and lower intermediate portion of the lateral surface on the left-right central side of the machine body 1 on the first support arm 6. The second fixing member 42 is attached to the front of the steering member 26. The second hydraulic cylinder 32 and the first fixing member 41 are located on the lateral surface opposite the first support arm 6, with the first support arm 6 in between.

[0067] A pair of flexible hydraulic hoses 10 (fourth section 14) extend forward from the lower part of the control valve unit 5, extend upward, and are fixed to the upper part of the third fixing member 43, and are provided between the support brackets 15 and 16.

[0068] The hydraulic hose 10 (fourth section 14) extends forward from the third fixing member 43 and downward, and is fixed to the lower part of the first fixing member 41. The bent portion 14a of the hydraulic hose 10 (fourth section 14) is located in front of the pivot axis 17 (axis P1) and is at approximately the same height as the pivot axis 17 (axis P1).

[0069] The hydraulic hose 10 (first portion 11) extends from the fourth portion 14 and the first fixing member 41 towards the rear (towards the front-to-rear center of the machine body 1) above the second support arm 8.

[0070] The hydraulic hose 10 (second section 12) has its extension direction reversed from the first section 11, extending forward, and is positioned above the second support arm 8, extending forward (towards the steering member 26) along the second support arm 8. The bent section 11a of the hydraulic hose 10 (the connection point between the first section 11 and the second section 12) is located above the pivot axis 8a (axis P2) of the second support arms 8 and 9.

[0071] The hydraulic hose 10 (third portion 13) extends downward from the second portion 12 toward the hydraulic motor 27, is fixed to the second fixing member 42, and is connected to the hydraulic motor 27.

[0072] The hydraulic fluid from the hydraulic pump 4 is supplied to the control valve unit 5, and from the control valve unit 5, it is supplied to and discharged from the hydraulic hose 10 via the fourth section 14, first section 11, second section 12, and third section 13 to the hydraulic motor 27, which in turn drives the wheels 19 to rotate in the forward and reverse directions.

[0073] (Configuration of hydraulic hoses that supply hydraulic fluid to the hydraulic motor) - 2 With the above configuration, as shown in Figures 3 to 6, a hydraulic hose 10 (first hydraulic hose) is provided that can supply hydraulic fluid from the hydraulic pump 4 to the hydraulic motor 27.

[0074] A first fixing member 41 is provided, positioned above the second support arm 8 (support arm). A second fixing member 42 is provided on the steering member 26. A third fixing member 43 is provided, positioned above the axis P1 (oscillating axis).

[0075] The first fixing member 41 is provided on the lateral surface of the first support arm 6 (support member) located above the third hydraulic cylinder 33 (steering cylinder). The second hydraulic cylinder 32 (lifting cylinder) is provided along the side surface of the first support arm 6 (support member) opposite to the side surface on which the first fixing member 41 is provided.

[0076] The hydraulic hose 10 (first hydraulic hose) is fixed to the third fixing member 43, extends from the third fixing member 43 toward the steering member 26, has a fourth portion 14 which is fixed to the first fixing member 41 and connected to the first portion 11, and whose extension direction is changed toward the first fixing member 41.

[0077] The hydraulic hose 10 (first hydraulic hose) is fixed to the first fixing member 41 and has a first portion 11 extending from the first fixing member 41 toward the opposite side from the steering member 26, a second portion 12 extending from the first portion 11 of the hydraulic hose 10 (first hydraulic hose) toward the steering member 26 along the second support arm 8 (support arm) with the direction of extension reversed, and a third portion 13 extending from the second portion 12 of the hydraulic hose 10 (first hydraulic hose) toward the hydraulic motor 27, fixed to the second fixing member 42 and connected to the hydraulic motor 27. The second portion 12 of the hydraulic hose 10 (first hydraulic hose) is provided below the first fixing member 41.

[0078] (Configuration of the hydraulic hose supplying hydraulic fluid to the third hydraulic cylinder) - 1 Of the four sets of first support arms 6, 7 and second support arms 8, 9, the hydraulic hoses 20 (corresponding to the second hydraulic hose) from the right front first support arm 6, 7 and second support arm 8, 9 to the third hydraulic cylinder 33 will be explained below based on Figures 3 to 6.

[0079] As shown in Figures 3 to 6, a pair of flexible hydraulic hoses 20 (third portion 23) extend forward from the lower part of the control valve unit 5 and upward, and are fixed to the upper and lower intermediate portion of the third fixing member 43 (the portion between the fourth portion 14 of the hydraulic hose 10 and the hydraulic hose 29), and are provided between the support brackets 15 and 16.

[0080] The hydraulic hose 20 (third portion 23) extends forward from the third fixing member 43 and downward, and is fixed to the upper part of the first fixing member 41. The bent portion 23a of the hydraulic hose 20 (third portion 23) is located in front of the pivot axis 17 (axis P1) and is at approximately the same height as the pivot axis 17 (axis P1).

[0081] The hydraulic hose 20 (first portion 21) extends from the third portion 23 and the first fixing member 41 towards the rear (towards the front-to-rear center of the machine body 1) above the second support arm 8.

[0082] The hydraulic hose 20 (second section 22) has its extension direction reversed from the first section 21, extending forward, and is positioned above the second support arm 8, extending forward (towards the steering member 26) along the second support arm 8, and is connected to the third hydraulic cylinder 33. The bent section 21a of the hydraulic hose 20 (the connection point between the first section 21 and the second section 22) is located above the pivot axis 8a (axis P2) of the second support arms 8 and 9.

[0083] Near the third fixing member 43, the third portion 23 of the hydraulic hose 20 is located below the fourth portion 14 of the hydraulic hose 10 in a side view. The hydraulic hose 29 is located below the third portion 23 of the hydraulic hose 20 in a side view.

[0084] The bent portion 23a of the hydraulic hose 20 (third portion 23) and the bent portion 29a of the hydraulic hose 29 are located on the rear side (towards the front-to-rear center of the machine body 1) relative to the bent portion 14a of the hydraulic hose 10 (fourth portion 14) when viewed from the side.

[0085] Near the first fixing member 41, the first portion 21 and the third portion 23 of the hydraulic hose 20 are positioned above the first portion 11 and the fourth portion 14 of the hydraulic hose 10 in a side view. The second portion 22 of the hydraulic hose 20 is located below the second portion 12 of the hydraulic hose 10 in a side view, and above the second support arm 8 and the third hydraulic cylinder 33.

[0086] The bent portion 21a of the hydraulic hose 20 (the connection point between the first portion 21 and the second portion 22) is located on the rear side (towards the front-to-rear center of the machine body 1) relative to the bent portion 11a of the hydraulic hose 10 (the connection point between the first portion 11 and the second portion 12) when viewed from the side.

[0087] (Configuration of the hydraulic hose supplying hydraulic fluid to the third hydraulic cylinder) - 2 With the above configuration, as shown in Figures 3 to 6, a hydraulic hose 20 (second hydraulic hose) is provided that can supply hydraulic fluid from the hydraulic pump 4 to the third hydraulic cylinder 33 (steering cylinder).

[0088] The hydraulic hose 20 (second hydraulic hose) is fixed to the third fixing member 43 and has a third portion 23 that extends from the third fixing member 43 toward the steering member 26, changes direction of extension toward the first fixing member 41, is fixed to the first fixing member 41 and is connected to the first portion 21 of the hydraulic hose 20 (second hydraulic hose).

[0089] The hydraulic hose 20 (second hydraulic hose) is fixed to the first fixing member 41 and has a first portion 21 that extends from the first fixing member 41 toward the opposite side from the steering member 26, and a second portion 22 that extends in the opposite direction from the first portion 21 of the hydraulic hose 20 (second hydraulic hose) and is connected to the third hydraulic cylinder 33 (steering cylinder).

[0090] The second portion 22 of the hydraulic hose 20 (second hydraulic hose) is provided below the first fixing member 41. The second portion 12 of the hydraulic hose 10 (first hydraulic hose) and the second portion 22 of the hydraulic hose 20 (second hydraulic hose) are provided below the first fixing member 41. The first portion 11 of the hydraulic hose 10 (first hydraulic hose) is fixed to the portion of the first fixing member 41 below the first portion 21 of the hydraulic hose 20 (second hydraulic hose).

[0091] (First alternative embodiment of the invention) Instead of four sets of first support arms 6,7 and second support arms 8,9, three sets of first support arms 6,7 and second support arms 8,9 may be provided, or six sets of first support arms 6,7 and second support arms 8,9 may be provided.

[0092] (Second alternative embodiment of the invention) In the first support arms 6, 7 and the second support arms 8, 9, the first hydraulic cylinder 31 may be eliminated, and the first support arms 6, 7 may be configured to be fixed to the machine body 1.

[0093] (Third alternative embodiment of the invention) The engine 3 may be eliminated, and the hydraulic pump 4 may be driven by an electric motor (corresponding to the drive unit) (not shown). [Industrial applicability]

[0094] This invention can be applied to work vehicles suitable for driving on uneven or sloping work surfaces, and can also be applied to work vehicles that can accommodate a worker. [Explanation of Symbols]

[0095] 1 unit 4. Hydraulic pump 6. First support arm (support member) 7. First support arm (support member) 8. Second support arm (support arm) 9. Second support arm (support arm) 10. Hydraulic hose (1st hydraulic hose) 11 Part 1 12 Part 2 13 Part 3 14 Part 4 19 wheels 20. Hydraulic hose (2nd hydraulic hose) 21 Part 1 22 Part 2 23 Part 3 26 Steering member 27 Hydraulic motor 31. First hydraulic cylinder (oscillating cylinder) 32. Second hydraulic cylinder (lifting cylinder) 33. Third hydraulic cylinder (steering cylinder) 41 First fixing member 42 Second fixing member 43 Third fixing member P1 Axis (Oscillating axis) P2 axis (lifting axis) P3 axis (steering axis)

Claims

1. A machine equipped with a hydraulic pump, Support arms attached to multiple locations on the aforementioned aircraft, A steering member supported at the end of the support arm is steerable around a steering axis along the vertical direction, The wheels for running are supported by the steering member, A steering cylinder is attached across the support arm and the steering member, and is capable of steering the steering member relative to the support arm. A hydraulic hose capable of supplying hydraulic fluid from the hydraulic pump to the steering cylinder, A first fixing member is provided at an upper position relative to the support arm, The hydraulic hose of the work vehicle has a first portion fixed to the first fixing member and extending from the first fixing member toward the opposite side from the steering member, and a second portion whose extension direction is reversed from the first portion of the hydraulic hose and connected to the steering cylinder.

2. The work vehicle according to claim 1, wherein the second portion of the hydraulic hose is provided below the first fixing member.

3. The aforementioned aircraft is equipped with a support member supported by the aircraft, The end of the support arm opposite to the steering member is supported at the lower part of the support member so as to be able to move up and down around a horizontal lifting axis. A lifting cylinder is attached across the support member and the support arm, and is capable of raising and lowering the support arm relative to the support member. The work vehicle according to claim 1, wherein the first fixing member is provided on the lateral surface of the support member located above the steering cylinder.

4. The work vehicle according to claim 3, wherein the lifting cylinder is provided along the side surface of the support member opposite to the side surface on which the first fixing member is provided.

5. The upper part of the support member is supported by the machine body so as to be able to swing around a pivot axis along the horizontal direction. A swing cylinder is attached across the machine body and the support member, and the support member is capable of swinging relative to the machine body. A third fixing member is provided above the pivot axis, The work vehicle according to claim 3, wherein the hydraulic hose is fixed to the third fixing member, extends from the third fixing member toward the steering member, has its extension direction changed toward the first fixing member, and has a third portion fixed to the first fixing member and connected to the first portion of the hydraulic hose.

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