Work machine

Abstract

A hydraulic shovel 1, which is a work machine, comprises hydraulic piping through which hydraulic oil flows. The hydraulic piping comprises: a discharge pipe 51 and a discharge pipe 52 for discharging hydraulic oil from a hydraulic oil tank 31 to a hydraulic valve disposed at the front of a driver's seat 14; and a return pipe 53 for returning the hydraulic oil from the hydraulic valve to the hydraulic oil tank 31. The discharge pipes 51 and 52 and the return pipe 53 are disposed vertically underneath the driver's seat 14 and vertically above a battery, the hydraulic oil tank 31, and an electric motor 33.

Description

Work machinery

[0001] The present disclosure relates to work machines.

[0002] In a work vehicle, a technique is known in which hydraulic piping is arranged to avoid the travel transmission mechanism, the electric mechanism for driving the work machine, the work machine, etc. by effectively utilizing the space within the vehicle frame (see, for example, Patent Document 1).

[0003] 2. Description of the Related Art In a work vehicle, a technique is known for simplifying and shortening the hydraulic system from a hydraulic power source to each hydraulic device as much as possible (see, for example, Patent Document 2).

[0004] BACKGROUND ART There is known a technique relating to a switching valve provided in a construction machine such as a hydraulic excavator, particularly a small- to medium-sized construction machine, and the arrangement of hydraulic hoses and wire harnesses connected thereto (see, for example, Patent Document 3).

[0005] JP 2006-315655 A JP 2016-077959 A JP 2014-114623 A

[0006] Work machines such as battery-powered hydraulic excavators, known as micro excavators, which have smaller bodies than the work vehicle disclosed in Patent Document 1, have limited space inside their bodies. For this reason, there is room for improvement in the appropriate placement of the battery and various components in small work machines.

[0007] An object of an aspect of the present invention is to appropriately arrange various components in a limited space below the driver's seat in a small work machine.

[0008] According to the present disclosure, there is provided a work machine comprising hydraulic piping through which hydraulic oil flows, the hydraulic piping comprising a discharge piping that discharges the hydraulic oil from a hydraulic oil tank to a hydraulic valve located in front of a driver's seat, and a return piping that returns the hydraulic oil from the hydraulic valve to the hydraulic oil tank, the discharge piping and the return piping being located below the driver's seat in the vertical direction and above a battery, a hydraulic oil tank, and an electric motor in the vertical direction.

[0009] According to the present disclosure, there is provided a work machine including a filter that is arranged forward in the longitudinal direction of a support member that supports an exterior cover of the work machine, rearward in the longitudinal direction of the center of rotation of the work machine, forward in the longitudinal direction of the battery, hydraulic pump, and electric motor, and vertically below the driver's seat.

[0010] According to the present disclosure, there is provided a work machine comprising a piping and electric wire bracket that holds hydraulic piping and electric wires through which hydraulic oil of the work machine flows, the piping and electric wire bracket comprising an upper stage portion, a middle stage portion located forward and below the upper stage portion, and a lower stage portion located forward and below the middle stage portion, the upper stage portion, the middle stage portion and the lower stage portion being arranged in a stepped manner that gets higher from front to rear in the fore-and-aft direction along a support member that supports an exterior cover of the work machine.

[0011] According to the present disclosure, in a small work machine, various components can be appropriately arranged in the limited space below the driver's seat.

[0012] FIG. 1 is a perspective view of a hydraulic excavator according to an embodiment, as viewed from the left front. FIG. 2 is a perspective view of a hydraulic excavator according to an embodiment, as viewed from the right rear. FIG. 3 is a perspective view showing the arrangement of each member arranged below the operator's seat. FIG. 4 is a perspective view of a piping / electrical wire bracket and a support member, as viewed from the left front. FIG. 5 is a plan view showing the arrangement of each member arranged below the operator's seat. FIG. 6 is a perspective view of a filter and a filter bracket. FIG. 7 is a plan view of the filter bracket. FIG. 8 is a perspective view of the filter bracket. FIG. 9 is a perspective view of the hydraulic piping and support member, as viewed from the left front.

[0013] Hereinafter, embodiments of 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. In addition, some components may not be used.

[0014] (Embodiment) <Working Machine> Fig. 1 is a perspective view of a hydraulic excavator according to an embodiment, as seen from the front left. Fig. 2 is a perspective view of the hydraulic excavator according to an embodiment, as seen from the rear right. In this embodiment, the working machine is a battery-powered hydraulic excavator (hereinafter referred to as "hydraulic excavator") 1. The hydraulic excavator 1 is an electrically driven hydraulic excavator powered by a battery (not shown) housed in a battery case 30 (see Fig. 3), which is an electricity storage device.

[0015] In the following description, the side of the hydraulic excavator 1 on which the work implement 12 is arranged is the front, and the side opposite the front is the rear. In the embodiment, left and right refer to left and right relative to the front. The left-right direction is the width direction of the vehicle body 10 of the hydraulic excavator 1. The upper side is the side that is perpendicular to the plane (ground contact plane) where the pair of left and right tracks 18 contact and faces the vehicle body 10. The lower side is the side opposite the upper side. An axis that faces the fore-aft direction of the vehicle body 10 and passes through the center of the vehicle body 10 in the width direction is called the fore-aft axis (central axis), and an axis that is perpendicular to the central axis, parallel to the installation plane, and faces the vehicle width direction of the vehicle body 10 is called the lateral axis. An axis that faces the up-down direction of the vehicle body 10 is called the vertical axis. The vertical axis is perpendicular to both the central axis and the lateral axis. The central axis is the X-axis, the vertical axis is the Y-axis, and the lateral axis is the Z-axis.

[0016] The hydraulic excavator 1 of the embodiment is a so-called micro excavator, which is a small hydraulic excavator with a working machine mass of less than 1 ton.

[0017] The hydraulic excavator 1 includes a vehicle body 10, a work implement 12, a blade 121, an operation unit 13, a driver's seat 14, an exterior cover 15, a floor plate 17, and a pair of left and right tracks 18. The vehicle body 10 has a body frame 11 (see FIG. 3 ). The body frame 11 supports the work implement 12, the blade 121, the operation unit 13, the driver's seat 14, the exterior cover 15, the components inside the exterior cover 15, and the floor plate 17. The tracks 18 are disposed at the left and right ends of the vehicle body 10, respectively.

[0018] The operating unit 13 is disposed in front of the driver's seat 14. The operating unit 13 includes various operating levers and the like that are used by the operator to operate the hydraulic excavator 1. More specifically, the operating unit 13 includes various operating levers and the like that are used by the operator to operate the travel of the hydraulic excavator 1 and the work performed by the work implement 12, etc.

[0019] The driver's seat 14 is an operator's seat on which an operator of the hydraulic excavator 1 sits. The driver's seat 14 is disposed on the vehicle body 10 of the hydraulic excavator 1. The driver's seat 14 is supported by a support member 20, which will be described later. The driver's seat 14 is attached above the exterior cover 15. The entire driver's seat 14 is detachable from the exterior cover 15. When the driver's seat 14 is to be removed, the driver's seat 14 is lifted upward relative to the exterior cover 15, with the engagement between a locking portion 233, which will be described later, and a hook member provided below the driver's seat 14 released. When the entire driver's seat 14 is removed in this manner, the components below the driver's seat 14 are exposed from an opening S1 in the upper end 15a of the exterior cover 15.

[0020] The exterior cover 15 has a box shape with openings at the bottom, top, and rear. The exterior cover 15 is disposed to cover the components disposed below the driver's seat 14. The exterior cover 15 houses the battery case 30 and other components inside. The exterior cover 15 is disposed on the vehicle body 10 of the hydraulic excavator 1. The exterior cover 15 is disposed above the body frame 11 of the hydraulic excavator 1. The lower opening of the exterior cover 15 is covered by the vehicle frame 11. The driver's seat 14 is detachably attached to an upper opening S1 of the exterior cover 15. A rear cover 16 is openably and closably attached to a rear opening S2 of the exterior cover 15. The exterior cover 15 has a rectangular outer shape that is approximately 10 cm or less larger than the circumference of the driver's seat 14 when viewed in the vertical direction. In the embodiment, the exterior cover 15 has, for example, a length in the left-right direction and a length in the front-to-rear direction of approximately several tens of centimeters and a height in the vertical direction of approximately several tens of centimeters.

[0021] The rear cover 16 can be opened and closed by rotating about an opening / closing axis AX9. The opening / closing axis AX9 of the rear cover 16 is disposed at the rear right of the vehicle body 10, in a direction slightly inclined with respect to the up-down and left-right directions. In the closed state, the rear cover 16 closes the rear opening S2 of the exterior cover 15. The lower end of the rear cover 16 is located at approximately the same height as the floor plate 17.

[0022] The rear cover 16 opens from left to right about an opening / closing axis AX9 located on the rear right side of the exterior cover 15. The rear cover 16 rotates approximately 90 degrees about the opening / closing axis AX9. When the rear cover 16 is in the open state, the handle portion of the battery housed in the battery case 30 is exposed, making it possible to attach and detach the battery housed in the battery case 30.

[0023] The floor plate 17 is a flat surface on which the operator places his / her feet. The floor plate 17 is disposed on the vehicle body 10 of the hydraulic excavator 1. The floor plate 17 is located in front of and below the driver's seat 14 and behind and below the operating unit 13. The floor plate 17 is disposed above the vehicle body frame 11. The height of the floor plate 17 from the ground is, for example, about 50 cm.

[0024] <Support Member> The support member 20 will be described with reference to Figures 3 and 4. Figure 3 is a perspective view showing the arrangement of the components arranged below the driver's seat. Figure 4 is a perspective view of the piping / electrical wire bracket and the support member as viewed from the left front. Figure 3 shows the driver's seat 14 removed from the exterior cover 15. The support member 20 supports the exterior cover 15 of the hydraulic excavator 1. The support member 20 supports the rear lower part of the driver's seat 14. The support member 20 supports a piping / electrical wire bracket 45 that supports hydraulic piping and electrical wiring such as an electrical harness, a filter bracket 41 that supports a filter 36, and the like. The support member 20 is fixed on the body frame 11 and is located below the upper end 15a of the exterior cover 15. The support member 20 includes a pipe member 21, a plate member (third member) 22, and a bracket support member 26.

[0025] The pipe member 21, together with the plate member 22, constitutes the support member 20. The pipe member 21 has a first main body portion (first member) 211 extending upward from the vehicle body 10 of the hydraulic excavator 1, and a second main body portion (second member) 212 extending rearward from the upper end of the first main body portion 211 via a bent portion 213. When viewed in the left-right direction, the pipe member 21 is an L-shaped pipe member in which the first main body portion 211, the second main body portion 212, and the bent portion 213 are integrally formed. The bent portion 213 connects the upper end of the first main body portion 211 and the front end of the second main body portion 212.

[0026] The first main body portion 211 extends upward from behind the rotation axis AX1 (see FIG. 5 ), which is the rotation center of the hydraulic excavator 1, at the center of the vehicle body 10 in the left-right direction. In this embodiment, the first main body portion 211 extends vertically. The first main body portion 211 is located forward of the battery case 30, the hydraulic oil tank 31, the hydraulic pump 32, and the electric motor 33. A lower end of the first main body portion 211 is fixed to the vehicle body frame 11 by a fixing portion 214.

[0027] The second main body portion 212 extends rearward from the center of the vehicle body 10 in the left-right direction. The second main body portion 212 has an upward slope toward the rear to match the slope of the underside of the driver's seat 14 attached to the exterior cover 15. The second main body portion 212 slopes upward from the front to the rear. The second main body portion 212 is located below the upper end portion 15a of the exterior cover 15. The second main body portion 212 is located above the battery case 30, the hydraulic oil tank 31, the hydraulic pump 32, and the electric motor 33.

[0028] The angle between the first body portion 211 and the second body portion 212 is greater than 90°.

[0029] The plate material 22 constitutes the support member 20 together with the pipe member 21. The plate material 22 has a main body portion 221 extending upward from the rear of the vehicle body 10. The main body portion 221 is a plate material. The upper end of the main body portion 221 is connected to the rear end of the second main body portion 212 of the pipe member 21. The main body portion 221 is inclined forward above the middle portion in the vertical direction to match the shape of the rear portion of the exterior cover 15. A tank cover (not shown) is fixed to the main body portion 221. The lower end of the main body portion 221 is fixed to the vehicle body frame 11 by a fixing portion 222.

[0030] When viewed from the up-down direction, the battery case 30 is disposed to the left of the first body portion 211 and the second body portion 212 of the pipe member 21 and the body portion 221 of the plate material 22, and the hydraulic oil tank 31 (see FIG. 5 ), hydraulic pump 32, and electric motor 33 are located to the right. The hydraulic oil tank 31, hydraulic pump 32, and electric motor 33 are located on the opposite side of the battery case 30, sandwiched between the first body portion 211 and the second body portion 212 of the pipe member 21 and the body portion 221 of the plate material 22.

[0031] When viewed from the left and right, the assembled pipe member 21 and plate member 22 form a U-shape that is open at the bottom.

[0032] The upper end of the main body 221 of the plate 22 is provided with a driver's seat support portion 23 that supports the rear lower portion of the driver's seat 14. The driver's seat support portion 23 is fixed by a fastening member to an attachment portion 223 that is provided at the upper end of the main body 221 of the plate 22 and is parallel to the horizontal direction.

[0033] The bracket support member 26 is a support member for attaching various brackets to the pipe member 21. In this embodiment, the bracket support member 26 attaches the filter bracket 41 and a piping / electrical wire bracket 45 (described later) to the pipe member 21. The bracket support member 26 is fixed to the first main body portion 211 of the pipe member 21.

[0034] <Components Inside the Exterior Cover> Other components inside the exterior cover 15 will be described using Figures 3 and 5. Figure 5 is a plan view showing the arrangement of the components arranged below the driver's seat. In addition to the support member 20, the exterior cover 15 accommodates a battery case 30, a hydraulic oil tank 31, a hydraulic pump 32, an electric motor 33, a swing motor 35, a filter 36, and the like.

[0035] The battery stored in the battery case 30 is the power source for the hydraulic excavator 1. The battery case 30 is a case that detachably houses a rechargeable battery that is detachable from the vehicle body 10. The battery is charged by an AC power source while removed from the vehicle body 10. The battery is, for example, a nickel-metal hydride battery or a lithium-ion battery. The weight of the battery case 30 including the battery housed therein is, for example, approximately 10 kg to 20 kg.

[0036] The battery case 30 is disposed below the driver's seat 14 of the hydraulic excavator 1. The battery case 30 is disposed on the other left-right side of the vehicle body 10. In the embodiment, the battery case 30 is disposed to the rear left of the vehicle body 10. In a top view, the battery case 30 is disposed on one left-right side of the second member. In the embodiment, the battery case 30 is disposed to the left of the pipe member 21 of the support member 20. The battery housed in the battery case 30 can be attached and detached with the rear cover 16 open. The battery housed in the battery case 30 can be attached and detached to and from the vehicle body 10.

[0037] The hydraulic oil tank 31 is a tank for hydraulic oil for the hydraulic excavator 1. A hydraulic pump 32 is disposed inside the hydraulic oil tank 31. The hydraulic oil tank 31 is disposed next to the rear of the battery case 30 in the left-right direction of the vehicle body 10. The hydraulic oil tank 31 is disposed on the vehicle body frame 11. In the embodiment, the hydraulic oil tank 31 is disposed on the right side in the left-right direction of the vehicle body 10. In the embodiment, the hydraulic oil tank 31 is disposed to the rear right of the vehicle body 10. The hydraulic oil tank 31 is disposed to the right of the support member 20. A tank cover is disposed to the rear left of the hydraulic oil tank 31.

[0038] The hydraulic pump 32 supplies hydraulic oil for operating the work equipment 12 of the hydraulic excavator 1. The hydraulic pump 32 is connected to the hydraulic oil tank 31 and the electric motor 33. The hydraulic oil discharged from the hydraulic pump 32 is supplied to an actuator (not shown) that drives the work equipment 12 and the like via hydraulic piping (not shown). The hydraulic pump 32 is disposed on the right side of the vehicle body 10, inside the hydraulic oil tank 31. The hydraulic pump 32 is disposed on the right side of the vehicle body 10 in the left-right direction. The hydraulic pump 32 is disposed on the vehicle body frame 11.

[0039] The electric motor 33 is a power source for the hydraulic excavator 1. The electric motor 33 supplies power for driving the hydraulic excavator 1. The electric motor 33 is driven by electricity supplied from a battery housed in the battery case 30. The electric motor 33 drives the hydraulic pump 32 and the like. The electric motor 33 is disposed on the right side of the vehicle body 10, in front of the hydraulic oil tank 31. The electric motor 33 is disposed to the right of the support member 20. The electric motor 33 is disposed on the vehicle body frame 11.

[0040] The swing motor 35 is a motor for swing that generates a driving force for swinging the swing body of the hydraulic excavator 1. The swing motor 35 is driven by hydraulic oil discharged from the hydraulic pump 32. The swing motor 35 is disposed on the front left of the vehicle body 10. The swing motor 35 is disposed on the front left of the support member 20. The swing motor 35 is disposed below the filter 36.

[0041] The filter 36 filters the hydraulic oil returning to the hydraulic oil tank 31. The filter 36 is provided on a return pipe 53, which is a pipe for returning hydraulic oil from a hydraulic valve (not shown) located in front of the operator's seat 14 of the hydraulic excavator 1 to the hydraulic oil tank 31. The hydraulic valve is located in front of the filter 36.

[0042] The filter 36 is disposed forward of the support member 20 that supports the exterior cover 15. The filter 36 is disposed forward and left of the bent portion 213 of the pipe member 21. The filter 36 is disposed rearward of the rotation axis AX1, which is the center of rotation of the hydraulic excavator 1. The filter 36 is disposed forward of the battery case 30, the hydraulic oil tank 31, and the electric motor 33. The filter 36 is disposed front and left of the vehicle body 10. The filter 36 is disposed above the rotation motor 35. The filter 36 is disposed below the driver's seat 14 and below the upper end 15a of the exterior cover 15. No other components are disposed above the filter 36 within the exterior cover 15. When the driver's seat 14 is removed from the exterior cover 15 as shown in FIG. 5 , the filter 36 is entirely exposed from the opening S1 of the exterior cover 15.

[0043] The axis AX2 (see FIG. 5 ) of the filter 36 is disposed in a horizontal plane. The axis AX2 of the filter 36 is inclined with respect to the left-right direction. The axis AX2 of the filter 36 is inclined rearward as it moves from right to left. Because the axis AX2 is disposed in a horizontal plane, when replacing the filter 36, the filter 36 can be lifted and removed from inside the exterior cover 15 with the driver's seat 14 removed from the exterior cover 15.

[0044] The filter 36 is disposed on the pipe member 21 of the support member 20 via a filter bracket 41. The filter 36 is disposed on the front left side of the bent portion 213 via the filter bracket 41.

[0045] The filter bracket 41 will be described using Figures 6 to 8. Figure 6 is a perspective view of the filter and the filter bracket. Figure 7 is a plan view of the filter bracket. Figure 8 is a perspective view of the filter bracket. For the sake of explanation, Figure 7 shows the filter 36 removed. The filter bracket 41 is a bracket for attaching the filter 36 to the support member 20. The filter bracket 41 is attached to the first main body portion 211 of the pipe member 21 of the support member 20 via the bracket support member 26. The filter bracket 41 has a hydraulic oil receiving portion 411 located below the filter 36.

[0046] The hydraulic oil receiving portion 411 is a tray that receives hydraulic oil that drips from the filter 36 when, for example, replacing the filter 36. The hydraulic oil receiving portion 411 is a rectangular plate that is slightly inclined by several degrees with respect to the horizontal plane.

[0047] The hydraulic oil receiving portion 411 is provided with a hydraulic oil drain hole 415 for draining hydraulic oil that has dripped from the filter 36, and an oil drain pipe 419 for discharging the hydraulic oil from the hole 415 to the outside of the hydraulic excavator 1. The surface of the hydraulic oil receiving portion 411 is inclined downward toward the hole 415 to make it easier to drain the hydraulic oil.

[0048] Walls 412, 413, 414, and 417 extend upward from the four peripheral edges of the hydraulic oil receiving portion 411. In other words, the lower ends of walls 412, 413, 414, and 417 are connected to the four peripheral edges of the hydraulic oil receiving portion 411. Walls 412 and 413 face each other, and walls 414 and 417 face each other. Wall 418 is disposed at the lower end of wall 417, extending in the opposite direction from the hydraulic oil receiving portion 411. Walls 417 and 418 are integrally formed into an L-shape. Wall 418 is attached to the first main body portion 211 of the pipe member 21 via the bracket support member 26.

[0049] <Hydraulic piping> The hydraulic piping will be described using Figures 4 and 9. Figure 9 is a perspective view of the hydraulic piping and support member as viewed from the left front. The hydraulic piping is piping through which hydraulic oil of the hydraulic excavator 1 flows. In this embodiment, the hydraulic piping includes two discharge pipes, discharge pipe 51 and discharge pipe 52, and a return pipe 53 for return.

[0050] The discharge pipes 51 and 52 are pipes that discharge hydraulic oil from the hydraulic oil tank 31 (see FIG. 5) to a hydraulic valve (not shown) that is located in front of the driver's seat 14 .

[0051] The return pipe 53 is a pipe that returns hydraulic oil from the hydraulic valve to the hydraulic oil tank 31 (see FIG. 5 ). The return pipe 53 is arranged along the second main body portion 212 of the pipe member 21 of the support member 20 that supports the exterior cover 15, via the piping / electric wire bracket 45.

[0052] The discharge pipe 51, the discharge pipe 52, and the return pipe 53 are arranged below the driver's seat 14 and above the battery case 30, the hydraulic oil tank 31, the hydraulic pump 32, and the electric motor 33. The discharge pipe 51, the discharge pipe 52, and the return pipe 53 are arranged below the upper end of the exterior cover 15. The discharge pipe 51, the discharge pipe 52, and the return pipe 53 are attached via a piping / electric wire bracket 45 to a pipe member 21 of a support member 20 that supports the exterior cover 15.

[0053] <Pipe and Electric Wire Bracket> The pipe and electric wire bracket 45 will be described with reference to Figures 4 and 9. The pipe and electric wire bracket 45 is a bracket for hydraulic pipes and electrical wiring 61 such as an electrical harness. The pipe and electric wire bracket 45 is a bracket for fixing the discharge pipe 51, the discharge pipe 52, and the return pipe 53. The pipe and electric wire bracket 45 is formed in a stepped shape. The pipe and electric wire bracket 45 includes an upper step portion 451a, a middle step portion 451c, a lower step portion 451e, a connecting portion 451b connecting the upper step portion 451a and the middle step portion 451c, and a connecting portion 451d connecting the middle step portion 451c and the lower step portion 451e.

[0054] The upper stage portion 451a, the middle stage portion 451c, and the lower stage portion 451e are arranged in a staggered plane with an upward-facing surface. The upper stage portion 451a, the middle stage portion 451c, and the lower stage portion 451e are arranged in a stepped manner that increases in height from the front to the rear in the front-to-rear direction along the pipe member 21 of the support member 20. The upper stage portion 451a, the middle stage portion 451c, and the lower stage portion 451e are arranged on opposite sides in the left-right direction of the filter 36 that filters the hydraulic oil, with the pipe member 21 of the support member 20 sandwiched therebetween.

[0055] The upper step portion 451a is arranged along the second main body portion 212 to the right of the second main body portion 212 of the pipe member 21. The upper step portion 451a is fixed along the second main body portion 212 via a bracket support member (not shown) fixed to the right of the second main body portion 212 of the pipe member 21. The middle step portion 451c is located forward and below the upper step portion 451a. The middle step portion 451c is located to the right of the bent portion 213 of the pipe member 21. The lower step portion 451e is fixed to the first main body portion 211 of the pipe member 21 of the support member 20 via a bracket support member 26. The lower step portion 451e is located forward and below the middle step portion 451c. The lower step portion 451e is located in front of the first main body portion 211 of the pipe member 21. The connecting portions 451b and 451d have surfaces facing forward.

[0056] The upper stage portion 451a is provided with a return pipe holding portion 452 that holds the return pipe 53 of the hydraulic pipes.

[0057] The return pipe holding portion 452 holds the return pipe 53 on the second main body portion 212 of the pipe member 21. When viewed in the vertical direction, the return pipe holding portion 452 is located on the second main body portion 212 of the pipe member 21. When viewed in the vertical direction, the return pipe holding portion 452 is located to the left of the discharge pipe holding portion 453.

[0058] The middle section 451c is provided with a discharge pipe holding section 453 that holds the discharge pipes 51 and 52 of the hydraulic pipes, and an electrical wiring holding section 454 that holds various electrical wiring 61 that is connected to various electrical components of the hydraulic excavator 1.

[0059] The discharge pipe holding portion 453 and the electrical wiring holding portion 454 are arranged on the middle step portion 451c, spaced apart in the left-right direction. The discharge pipe holding portion 453 holds the discharge pipes 51 and 52 to the right of the bent portion 213 of the pipe member 21. The electrical wiring holding portion 454 holds the electrical wiring 61 to the right of the bent portion 213 of the pipe member 21, to the right of the discharge pipe holding portion 453. In the embodiment, on the middle step portion 451c, the discharge pipe holding portion 453 is arranged on the left, and the electrical wiring holding portion 454 is arranged on the right. The discharge pipes 51 and 52 are held by the discharge pipe holding portion 453, and the electrical wiring 61 is held by the electrical wiring holding portion 454.

[0060] In this way, the discharge pipes 51 and 52 are held in the discharge pipe holder 453, the return pipe 53 is held in the return pipe holder 452, and the various electrical wiring 61 is held in the electrical wiring holder 454. The hydraulic pipes, which are the discharge pipes 51 and 52 and the return pipe 53, are arranged on the pipe / electrical wire bracket 45, separated in the left-right direction from the electrical wiring 61 connected to the various electrical components. The hydraulic pipes and the electrical wiring 61 are routed separately to the left and right in the space below the driver's seat 14.

[0061] The discharge pipes 51 and 52 are held by the discharge pipe holder 453, and the return pipe 53 is held by the return pipe holder 452. As a result, the discharge pipes 51 and 52 and the return pipe 53 are arranged separately in the left and right direction on the pipe / electric wire bracket 45. The discharge pipes 51 and 52 and the return pipe 53 are routed separately to the left and right in the space below the driver's seat 14.

[0062] <Effects> As described above, in the embodiment, the discharge pipe 51, the discharge pipe 52, and the return pipe 53 can be arranged below the operator's seat 14 and above the battery case 30, the hydraulic oil tank 31, the hydraulic pump 32, and the electric motor 33. According to the embodiment, in a small hydraulic excavator 1, various components can be appropriately arranged in the limited space below the operator's seat 14.

[0063] In the embodiment, the discharge pipe 51, the discharge pipe 52, and the return pipe 53 can be attached to the pipe member 21 of the support member 20 that supports the exterior cover 15 via a stepped pipe / electric wire bracket 45. According to the embodiment, it is possible to prevent the positions of the discharge pipe 51, the discharge pipe 52, and the return pipe 53 from shifting. According to the embodiment, in a small hydraulic excavator 1, it is possible to appropriately arrange various components in the limited space below the operator's seat 14.

[0064] In the embodiment, the return pipe 53 can be arranged along the second body portion 212 extending rearward from the upper end of the first body portion 211 via the bent portion 213. According to the embodiment, in the small hydraulic excavator 1, various components can be appropriately arranged in the limited space below the operator's seat 14.

[0065] According to the embodiment, the discharge pipes 51 and 52 are held in the discharge pipe holding portion 453, and the electrical wiring 61 is held in the electrical wiring holding portion 454, so that the hydraulic pipes and the electrical wiring 61 can be routed separately to the left and right in the space below the driver's seat 14. According to the embodiment, it is possible to prevent the hydraulic pipes and the electrical wiring 61 from being mixed in the limited space below the driver's seat 14.

[0066] According to the embodiment, the discharge pipes 51 and 52 are held in the discharge pipe holding portion 453, and the return pipe 53 is held in the return pipe holding portion 452, so that the discharge pipes 51 and 52 and the return pipe 53 can be routed separately to the left and right in the space below the driver's seat 14. According to the embodiment, it is possible to prevent the discharge pipes 51 and 52 and the return pipe 53 from being mixed in the limited space below the driver's seat 14.

[0067] In the embodiment, the filter 36 can be disposed forward of the support member 20 that supports the exterior cover 15, rearward of the rotation center (rotation axis AX1), forward of the battery case 30, the hydraulic pump 32, and the electric motor 33, below the driver's seat 14, and below the upper end portion 15a of the exterior cover 15. According to the embodiment, the filter 36 can be disposed in the limited space below the driver's seat 14. In this way, according to the embodiment, various components can be appropriately disposed in the limited space below the driver's seat 14.

[0068] In the embodiment, the central axis AX2 of the filter 36 is disposed in a horizontal plane. According to the embodiment, the filter 36 is exposed when the driver's seat 14 is removed from the exterior cover 15, and therefore the filter 36 can be lifted and removed from inside the exterior cover 15. According to the embodiment, the replacement work of the filter 36 can be simplified.

[0069] In the embodiment, the hydraulic oil receiving portion 411 can receive hydraulic oil that drips when replacing the filter 36. According to the embodiment, the hydraulic oil that drips when replacing the filter 36 can reduce contamination of the inside of the vehicle body 10.

[0070] In the embodiment, the hydraulic oil dripping into the hydraulic oil receiving portion 411 can be discharged from the hole 415 to the outside of the vehicle through the oil drain pipe 419. In the embodiment, the work of recovering the hydraulic oil accumulated in the hydraulic oil receiving portion 411 can be reduced.

[0071] In the embodiment, the filter 36 can be fixed to the support member 20 that supports the exterior cover 15 via the filter bracket 41. According to the embodiment, the filter 36 can be appropriately positioned in the limited space under the driver's seat 14 using the support member 20.

[0072] In the embodiment, the upper stage portion 451a, the middle stage portion 451c, and the lower stage portion 451e are arranged in a stepped manner that increases in height from the front to the rear in the front-to-rear direction along the pipe member 21 of the support member 20. According to the embodiment, in the small hydraulic excavator 1, the discharge pipe 51, the discharge pipe 52, and the return pipe 53 can be appropriately arranged in the limited space below the operator's seat.

[0073] In the embodiment, the upper stage portion 451a can accommodate the return pipe holding portion 452. According to the embodiment, the return pipe 53 can be appropriately arranged.

[0074] In the embodiment, the middle stage portion 451c can be provided with a discharge pipe holding portion 453 that holds the discharge pipe 51 and the discharge pipe 52. According to the embodiment, the discharge pipe 51 and the discharge pipe 52 can be appropriately arranged.

[0075] In the embodiment, the upper stage portion 451 a, the middle stage portion 451 c, and the lower stage portion 451 e can be arranged on opposite sides in the left-right direction with respect to the filter 36, with the pipe member 21 of the support member 20 sandwiched therebetween. According to the embodiment, in the small hydraulic excavator 1, various components can be appropriately arranged in the limited space below the operator's seat.

[0076] In the embodiment, the discharge pipe 51, the discharge pipe 52, and the return pipe 53 can be attached to the pipe member 21 of the support member 20 that supports the exterior cover 15 via a stepped pipe / electric wire bracket 45. According to the embodiment, it is possible to prevent the positions of the discharge pipe 51, the discharge pipe 52, and the return pipe 53 from shifting. According to the embodiment, in a small hydraulic excavator 1, it is possible to appropriately arrange various components in the limited space below the operator's seat.

[0077] In the embodiment, the lower step portion 451 e of the piping / electric wire bracket 45 can be appropriately fixed to the first main body portion 211 of the pipe member 21 of the support member 20 .

[0078] In the embodiment, the return pipe holding portion 452 of the upper step portion 451 a of the piping and electric wire bracket 45 allows the return pipe 53 to be arranged along the second main body portion 212 extending rearward from the upper end portion of the first main body portion 211 via the bent portion 213. According to the embodiment, in the small hydraulic excavator 1, various components can be appropriately arranged in the limited space below the operator's seat.

[0079] In the embodiment, the middle portion 451 c of the piping / electric wire bracket 45 can be disposed to the right of the bent portion 213 .

[0080] According to the embodiment, the discharge pipes 51 and 52 are held in the discharge pipe holding portion 453, and the electrical wiring 61 is held in the electrical wiring holding portion 454, so that the hydraulic pipes and the electrical wiring 61 can be routed separately to the left and right in the space below the driver's seat. According to the embodiment, it is possible to prevent the hydraulic pipes and the electrical wiring from being mixed in the limited space below the driver's seat 14.

[0081] DESCRIPTION OF SYMBOLS 1...hydraulic excavator, 10...body, 11...body frame, 12...working machine, 121...blade, 13...operating unit, 14...driver's seat, 15...exterior cover, 17...floor plate, 18...track, 20...support member, 21...pipe member, 211...first main body portion, 212...second main body portion, 213...bent portion, 214...fixing portion, 22...plate material, 221...main body portion, 222...fixing portion, 223...mounting portion, 23...driver's seat support portion, 233...locking portion, 30...battery case , 31...hydraulic oil tank, 32...hydraulic pump, 33...electric motor, 35...swing motor, 36...filter, 45...bracket for piping and electrical wires, 451a...upper section, 451b...connection section, 451c...middle section, 451d...connection section, 451e...lower section, 452...return piping holding section, 453...discharge piping holding section, 454...electrical wiring holding section, 51...discharge piping (hydraulic piping), 52...discharge piping (hydraulic piping), 53...return piping (hydraulic piping), 61...electrical wiring.

Claims

1. A work machine comprising hydraulic piping through which hydraulic oil flows, the hydraulic piping comprising: a discharge piping that discharges the hydraulic oil from a hydraulic oil tank to a hydraulic valve located in front of a driver's seat; and a return piping that returns the hydraulic oil from the hydraulic valve to the hydraulic oil tank, the discharge piping and the return piping being located below the driver's seat in the vertical direction and above a battery, hydraulic oil tank, and electric motor in the vertical direction.

2. A work machine as described in claim 1, wherein the discharge pipe and the return pipe are attached to a support member that supports the exterior cover of the work machine via a piping / electrical wire bracket that secures the discharge pipe and the return pipe to the electrical wiring.

3. A work machine according to claim 2, wherein the return pipe is arranged along the support member via the pipe / electric wire bracket.

4. A work machine as set forth in claim 2, wherein the discharge pipe and the return pipe are arranged on the pipe / electric wire bracket separately in the left and right direction from the electrical wiring connected to various electrical components.

5. A work machine according to claim 3, wherein the discharge pipe and the return pipe are arranged separately in the left and right directions on the pipe / electric wire bracket.

6. A work machine as described in claim 3, wherein the piping and electric wire bracket comprises an upper section in which a return piping holding section for holding the return piping of the hydraulic piping is disposed, a middle section located below the upper section in which a discharge piping holding section for holding the discharge piping of the hydraulic piping is disposed, and a lower section located below the middle section.

7. A work machine as set forth in claim 1, comprising: an exterior cover arranged above a body frame; a support member arranged inside the exterior cover; a removable battery arranged inside the exterior cover; a hydraulic oil tank arranged inside the exterior cover; a hydraulic pump arranged inside the exterior cover; and an electric motor arranged inside the exterior cover.

8. A work machine equipped with a filter that is arranged forward in the longitudinal direction of a support member that supports the exterior cover of the work machine, rearward in the longitudinal direction of the center of rotation of the work machine, forward in the longitudinal direction of the battery, hydraulic pump, and electric motor, and vertically below the driver's seat.

9. The work machine according to claim 8, wherein the central axis of the filter is disposed in a horizontal plane.

10. A work machine according to claim 8, comprising a filter bracket for attaching the filter to the support member, the filter bracket comprising a hydraulic oil receiving portion located below the filter in the vertical direction.

11. A work machine according to claim 10, wherein the hydraulic oil receiving portion is provided with a hole for draining hydraulic oil and an oil drain pipe for discharging hydraulic oil from the hole to the outside of the work machine.

12. A work machine according to claim 8, comprising: an exterior cover arranged above the body frame; a removable battery arranged inside the exterior cover; a hydraulic pump arranged inside the exterior cover; and an electric motor arranged inside the exterior cover.

13. A work machine comprising a piping and electric wire bracket that holds hydraulic piping and electric wires through which hydraulic oil of the work machine flows, said piping and electric wire bracket comprising an upper stage portion, a middle stage portion located forward and below said upper stage portion, and a lower stage portion located forward and below said middle stage portion, said upper stage portion, said middle stage portion and said lower stage portion being arranged in a stepped manner that gets higher from front to rear in the fore-and-aft direction along a support member that supports an exterior cover of said work machine.

14. A work machine according to claim 13, wherein the upper stage portion is provided with a return pipe holding portion that holds a return pipe of the hydraulic pipes.

15. A work machine according to claim 13, wherein the middle section is provided with a discharge pipe holding section that holds a discharge pipe of the hydraulic pipes.

16. A work machine as described in claim 13, wherein the upper, middle and lower sections are arranged on opposite sides in the left-right direction of a filter that filters hydraulic oil, with a support member that supports an exterior cover of the work machine sandwiched between them.

17. A work machine according to claim 13, wherein the lower stage portion is fixed to a first main body portion of a support member that supports an exterior cover of the work machine and extends upward from the body of the work machine.

18. A work machine according to claim 13, wherein the upper stage portion is fixed to a second body portion extending from an upper end of a first body portion of a support member that supports an exterior cover of the work machine and that extends upward from the body of the work machine.

19. A work machine according to claim 13, wherein the middle section is located on the side of a bent section of a support member that supports an exterior cover of the work machine.

20. A work machine as described in claim 15, wherein an electrical wiring holding section for holding the electrical wiring of the work machine is disposed in the middle section, and the discharge pipe holding section and the electrical wiring holding section are disposed spaced apart in the left-right direction.

21. A work machine according to claim 13, comprising: an exterior cover arranged above the body frame; a support member arranged inside the exterior cover; a detachable battery arranged inside the exterior cover; and a filter arranged inside the exterior cover.

22. The work machine according to any one of claims 1 to 21, wherein the work machine is a battery-powered hydraulic excavator.

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