Working vehicle

Abstract

A working vehicle according to the present disclosure is provided with: a plurality of batteries; a cooling unit that discharges a cooling medium for cooling the plurality of batteries; a case that accommodates at least one of the plurality of batteries; a pipe that is connected to the case and through which the cooling medium flows; and a support member that is provided to the case and supports the pipe.

Description

Work vehicle

[0001] The present disclosure relates to a work vehicle used for performing operations such as agricultural work. This application claims priority based on Japanese Application No. 2024-226259 filed on December 23, 2024, and incorporates all the descriptions set forth in the above Japanese application.

[0002] Patent Document 1 discloses a work vehicle. The work vehicle is a vehicle driven by an electric motor and equipped with a battery.

[0003] Japanese Unexamined Patent Application Publication No. 2022-176726

[0004] The work vehicle not only travels on a leveled road surface but also travels on a rough road surface, a road surface with irregularities, or an inclined road surface. In order for the work vehicle to travel on such road surfaces, it is necessary to stably support the pipes mounted on the work vehicle. The present disclosure aims to prevent problems with the pipes mounted on the work vehicle.

[0005] The work vehicle of the present disclosure includes a plurality of batteries, a cooling unit that discharges a cooling medium for cooling the plurality of batteries, a case that houses at least one of the plurality of batteries, a pipe connected to the case through which the cooling medium flows, and a support member provided on the case for supporting the pipe.

[0006] According to the present disclosure, problems with the pipes mounted on the work vehicle can be prevented.

[0007] Figure 1 is a perspective view showing one embodiment of the work vehicle. Figure 2 is a perspective view of the work vehicle. Figure 3 is a plan view of the work vehicle shown in Figure 2. Figure 4 is a left side view of the work vehicle shown in Figure 2. Figure 5 is a right side view of the work vehicle shown in Figure 2. Figure 6 is a configuration diagram of the work vehicle. Figure 7 is a schematic diagram showing a modified work vehicle. Figure 8 is a schematic diagram showing a modified work vehicle. Figure 9 is a schematic diagram showing a modified work vehicle. Figure 10 is a schematic diagram showing a modified work vehicle. Figure 11 is an explanatory diagram showing the cooling unit, the first battery, and the schematic configuration of the surrounding area. Figure 12 is a perspective view of the battery, case, and piping from the front left. Figure 13 is a perspective view of the battery, case, and piping from the front right. Figure 14 is a perspective view of the battery, case, and piping from the rear. Figure 15 is a perspective view from the rear of the support members that support the front side of the supply piping and the front side of the return piping, respectively. Figure 16 is a perspective view of the support members of Figure 15 from the front. Figure 17 is an enlarged perspective view of the support member supporting the front of the supply pipe, as seen from the front. Figure 18 is a perspective view showing the support member supporting the rear of the left supply pipe. Figure 19 is a perspective view showing the support member supporting the rear of the left return pipe. Figure 20 is a perspective view showing a modified example of the support member supporting the rear of the left supply pipe.

[0008] <Outline of Embodiments of the Disclosure> The outline of embodiments of the disclosure is described below. (1) A work vehicle according to the embodiment comprises a plurality of batteries, a cooling unit that discharges a cooling medium for cooling the plurality of batteries, a case that houses at least one of the plurality of batteries, a pipe connected to the case through which the cooling medium flows, and a support member provided in the case for supporting the pipe.

[0009] According to the aforementioned work vehicle, the piping connected to a case housing at least one of the multiple batteries is supported by a support member provided on the case. This prevents problems such as the piping interfering with other components and being damaged when the work vehicle is in motion.

[0010] (2) In the work vehicle described in (1) above, it is preferable that the case includes a first case for housing the battery and the cooling unit, the piping is connected to the first case, and the support member is provided on the first case. In this case, the piping connected to the first case for housing the battery and the cooling unit is supported by the support member provided on the first case, so that problems such as the piping connected to the first case being damaged by interference with other members when the work vehicle is in motion can be prevented.

[0011] (3) In the work vehicle described in (2) above, the case preferably includes a second case that houses batteries among the plurality of batteries that are not housed in the first case, and the piping preferably connects the first case and the second case in order to cool the batteries housed in the second case with the cooling medium. In this case, the piping through which the cooling medium that cools the batteries housed in the second case flows is supported by a support member, so that the cooling medium does not leak due to damage to the piping when the work vehicle is running, for example.

[0012] (4) The work vehicle described in (3) above is preferably equipped with a moving mechanism that changes the relative position of the first case with respect to the second case, and the support member is movable together with the first case in accordance with the change in the relative position. In this case, the support member also moves together with the first case in accordance with the change in the relative position of the first case with respect to the second case, so that the piping can be supported by the support member even if the relative position changes.

[0013] (5) In the work vehicle described in (4) above, the piping has a flexible portion that moves in accordance with the change in the relative position and a non-flexible portion that does not move even when the relative position changes, and it is preferable that the support member supports the non-flexible portion. In this case, the support member supports the non-flexible portion of the piping that does not move even when the relative position changes, so the piping can be reliably supported.

[0014] (6) In the work vehicle described in any of (1) to (5) above, it is preferable that the piping has a curved portion in which the direction of extension of the piping changes, and that the support member supports the curved portion. In this case, since the support member supports the curved portion in which the direction of extension of the piping changes, the piping can be stably supported by the support member even if the direction of extension of the piping changes.

[0015] (7) In the work vehicle described in (6) above, it is preferable that the curved portion has a first end and a second end that extend in different directions from each other, and the support member has a first support portion that supports the first end while fixing the direction in which the first end extends. In this case, by supporting the first end of the curved portion with the first support portion, the direction in which the first end of the curved portion extends is fixed, so that the piping can be supported more stably.

[0016] (8) In the work vehicle described in (7) above, it is preferable that the support member has a second support portion that supports the second end while fixing the direction in which the second end extends. In this case, by supporting the second end of the curved portion with the second support portion, the direction in which the second end of the curved portion extends is fixed, so that the piping can be supported more stably.

[0017] (9) In the work vehicle described in (8) above, the support member preferably has a mounting portion to which the first support portion and the second support portion are attached, and the mounting portion is provided on the case. In this case, the first support portion and the second support portion can be easily provided on the case via the mounting portion.

[0018] <Details of Embodiments of the Invention> The details of embodiments of the invention will be described below with reference to the drawings. At least some of the embodiments described below may be combined in any way.

[0019] [Overall Configuration of the Work Vehicle] Figures 1 and 2 are perspective views showing one embodiment of the work vehicle. This work vehicle 10 has an exterior member 9, and Figure 2 shows the exterior member 9 removed. The exterior member 9 is attached to the frames 20 and 21 of the work vehicle 10. The exterior member 9 protects the various pieces of equipment on the work vehicle 10 and also enhances its aesthetic appearance. Figures 3, 4, and 5 are a plan view, left side view, and right side view of the work vehicle 10 shown in Figure 2. Figure 6 is a diagram showing the configuration of the work vehicle 10.

[0020] The work vehicle 10 has a running gear 12 and travels on road surfaces such as fields and roads. In the case of the work vehicle 10 of this embodiment, the direction pointed to by arrow X1 in each figure is the basic direction of travel and is defined as "forward". In each figure, the direction pointed to by arrow X2 is the opposite direction of the basic direction of travel and is defined as "rear". In each figure, the direction pointed to by arrow Y1 is defined as "left", the direction pointed to by arrow Y2 is defined as "right", the direction pointed to by arrow Z1 is defined as "up", and the direction pointed to by arrow Z2 is defined as "down".

[0021] The work vehicle 10 is capable of moving straight in both forward and backward directions, as well as turning left and turning right, thanks to its running gear 12. The running gear 12 is located at four points on the front, rear, left, and right of the vehicle body 11, and each running gear 12 has wheels 25. The work vehicle 10 has a hydraulic motor, which allows the direction of the wheels 25 (the direction in which the wheels 25 roll) to be changed within a 360-degree range. Therefore, the work vehicle 10, which can move forward and backward, can move straight in all 360 degrees. Note that an electric motor may be used instead of the hydraulic motor. Alternatively, the work vehicle 10 may be capable of changing the direction of the wheels 25 from the basic direction of travel within a range of 0 to 90 degrees, for example, by a hydraulic cylinder. When the direction of the wheels 25 changes by 90 degrees from the basic direction of travel, their rolling direction becomes either left or right. The work vehicle 10 can also move straight in either left or right. Furthermore, the work vehicle 10 may be able to change the direction of its wheels 25 within a range of 0 to -90 degrees using the hydraulic cylinder, from its initial state in the basic direction of travel. Since the direction of the wheels 25 can be changed within a range of 0 to 90 degrees and within a range of 0 to -90 degrees from its initial state in the basic direction of travel, and since it is possible to move forward and backward, the work vehicle 10 can move in a straight line in all 360 degrees.

[0022] The work vehicle 10 connects to the work machine 19 via a coupling device 15. Figures 1, 2, 4, and 5 show the work machine 19 as a dashed line. The work machine 19 has a configuration and functions for performing various tasks. The tasks performed by the work machine 19 include, but are not limited to, agricultural work, industrial work (civil engineering, construction, etc.), and transportation work. The work vehicle 10 travels together with the work machine 19, while the work machine 19 performs its tasks.

[0023] In this embodiment, the work performed by the implement 19 is agricultural work. The implement 19 includes, for example, a spraying device for applying fertilizer or chemicals to a field, a seeding device for sowing seeds, a tilling device for cultivating the soil, a tilling device for tilling the soil, a weeding device for weeding, a soil mounding device for mounding soil, and so on. The implement 19 is replaced according to the required work.

[0024] The configuration of each part of the work vehicle 10 will now be described. The work vehicle 10 has one vehicle body 11 and four running devices 12 for moving the vehicle body 11. The work vehicle 10 in this embodiment has a coupling device 15 attached to the vehicle body 11. The coupling device 15 is a device for connecting a work machine 19 to the vehicle body 11. The coupling device 15 has a lifting mechanism 70 for raising and lowering the work machine 19. The specific configuration of the coupling device 15 will be described later.

[0025] The coupling device 15 allows the work equipment 19 to be detached. The work vehicle 10 allows the coupling device 15 to be detached. If the work equipment 19 is not needed for the work vehicle 10, the work equipment 19 is detached from the coupling device 15. Furthermore, the coupling device 15 may be detached from the vehicle body 11. The work vehicle 10 can run with the coupling device 15 mounted, even though the work equipment 19 has been detached, and the work vehicle 10 can also run with not only the work equipment 19 but also the coupling device 15 detached from the vehicle body 11.

[0026] The vehicle body 11 has a central frame 20 and a pair of side frames 21, 21 located on the left and right sides of the central frame 20. The left side frame 21 may be described as "21L" and the right side frame 21 as "21R". The running gear 12, including the wheels 25, is mounted on the side frames 21. Each of the pair of side frames 21, 21 is displaceable relative to the central frame 20, and the work vehicle 10 can be deformed according to the work content or operating conditions such as the shape of the road surface.

[0027] Figures 7, 8, 9, and 10 are schematic diagrams showing a deformed work vehicle 10. As shown in Figures 7 and 8, the central frame 20 and the left side frame 21L and the right side frame 21R are each displaceable relative to each other in the left-right and up-down directions. The left side frame 21L and the right side frame 21R are each displaceable independently. The work vehicle 10 has displacement actuators 13 that allow the central frame 20 and the side frames 21L and 21R to be displaced relative to each other in the left-right and up-down directions.

[0028] The work vehicle 10 has left and right actuators 131 and up and down actuators 132 as displacement actuators 13. The left and right actuators 131 (see Figure 7) extend and retract, displacing the side frames 21L and 21R, respectively, in the left and right directions relative to the central frame 20. As a result, the work vehicle 10 changes the distance between the left and right wheels 25 according to the width of the furrows in the field, for example, and travels.

[0029] The vertical actuator 132 (see Figure 8) extends and retracts, displacing the central frame 20 vertically relative to the side frames 21L and 21R. The central frame 20 becomes higher than the side frames 21L and 21R. As a result, the work vehicle 10 changes the position of the central frame 20 vertically according to the height of the furrows in the field, for example, and travels while straddling the furrows.

[0030] The central frame 20 and the side frames 21L and 21R each only need to be displaceable in at least one of the left-right and up-down directions relative to each other. To this end, the work vehicle 10 only needs to have displacement actuators 13 in the direction that allows the side frames 21L and 21R to be displaced.

[0031] The deformation of the vehicle body 11 in the longitudinal direction occurs within the central frame 20. That is, as shown in Figure 10, the central frame 20 mounts the battery 16 (first battery 16A) and the first case 205 that houses the battery 16. The first case 205 can be displaced in the longitudinal direction by the displacement actuator 13, which is the longitudinal actuator 133. The battery 16 (first battery 16A) is heavy. As the battery 16 (first battery 16A) is displaced in the longitudinal direction within the central frame 20, the vehicle body 11 deforms, and its center of gravity can be changed. For example, when the work vehicle 10 travels on an inclined surface, it changes its center of gravity depending on its posture or depending on the work machine 19 it is connected to.

[0032] As another example of deformation of the work vehicle 10 in the longitudinal direction (see Figure 9), the work vehicle 10 may have front and rear actuators 133 as displacement actuators 13, and the front and rear actuators 133 may extend and retract to relatively displace the central frame 20 and the side frames 21L and 21R, respectively, in the longitudinal direction. By displacing the central frame 20 in the longitudinal direction, the center of gravity of the vehicle body 11 can be changed.

[0033] As shown in Figures 7 and 8, the central frame 20 and the side frames 21L and 21R are each displaceable relative to each other in at least one of the left-right and up-down directions. The displacement actuator 13 displaces the central frame 20 and the side frames 21L and 21R relative to each other in at least one of the left-right and up-down directions. As shown in Figure 10, the central frame 20 has a battery 16 (first battery 16A) and a first case 205 that houses the battery 16 (first battery 16A). The first case 205 is displaceable in the front-rear direction and is housed in the central frame 20. The displacement actuator 13 displaces the first case 205 in the front-rear direction within the central frame 20.

[0034] Each of the above-described forms of work vehicle 10 deforms its vehicle body 11 according to, for example, the shape of the road surface it is traveling on. The work vehicle 10 can operate with the work machine 19 while traveling with the vehicle body 11 deformed.

[0035] The work vehicle 10 (see Figures 2 to 5) has four running gears 12 located on the front, rear, left, and right sides of the vehicle body 11. The running gears 12 are attached to each of the left and right pair of side frames 21. The left front running gear 12 may be described as "12LF", the right front running gear 12 as "12RF", the left rear running gear 12 as "12LR", and the right rear running gear 12 as "12RR".

[0036] Each running gear 12 has wheels 25, a motor 26 for driving, a reduction gear 27, and a power transmission unit 28 including gears and a shaft. The rotational force of the motor 26 is reduced by the reduction gear 27, and the reduced power is transmitted to the wheels 25 through the power transmission unit 28, causing the wheels 25 to rotate. As a result, the work vehicle 10 moves.

[0037] The left front running gear 12LF and the left rear running gear 12LR are mounted on the left side frame 21L, and together they constitute the left running unit UL. The left running unit UL includes the left second battery 16L, a sub-junction box 24L, and inverters 31 connected to the front and rear running motors 26, respectively, which are mounted on the side frame 21L. The right front running gear 12RF and the right rear running gear 12RR are mounted on the right side frame 21R, and together they constitute the right running unit UR. The right running unit UR includes the right second battery 16R, a sub-junction box 24R, and inverters 31 connected to the front and rear running motors 26, respectively, which are mounted on the side frame 21R. The central frame 20 mounts the first battery 16A, a hydraulic unit 17, and a main junction box 24A, etc., and together they constitute the central unit UC. In this embodiment, as described above (see Figure 10), the first case 205 housing the first battery 16A is displaced in the front-rear direction within the central frame 20. In contrast, the hydraulic unit 17 and other equipment, including the main junction box 24A, are not displaced in the front-rear direction.

[0038] The work vehicle 10 has steering actuators 29 that change the rolling direction of each of the four wheels 25 of the running gear 12 (see Figure 3). In this embodiment, the running gear 12 is supported by the side frame 21 and is pivotable around its vertical axis. The steering actuators 29 are mounted between the side frame 21 and the running gear 12. The steering actuators 29 change the orientation of the running gear 12 by extending and retracting. This changes the rolling direction of the wheels 25, and thus changes the direction of travel of the work vehicle 10.

[0039] The work vehicle 10 includes a control device 14, a battery 16, a hydraulic unit 17, and a cooling unit 23. The control device 14 controls the operation of each component of the work vehicle 10, such as the travel device 12 (motor 26), displacement actuator 13, steering actuator 29, hydraulic unit 17, and cooling unit 23.

[0040] Battery 16 is a rechargeable battery that can be discharged and recharged. Battery 16 supplies power to each piece of equipment on the work vehicle 10. In this embodiment (see Figure 6), the work vehicle 10 has one first battery 16A and two second batteries 16L and 16R. The first battery 16A is mounted on the central frame 20. One second battery 16L is mounted on the left side frame 21L, and the other second battery 16R is mounted on the right side frame 21R.

[0041] In this embodiment, the displacement actuator 13 and the steering actuator 29 are composed of hydraulic cylinders. The hydraulic unit 17 generates hydraulic pressure to extend and retract the hydraulic cylinders. The hydraulic unit 17 includes a tank for storing hydraulic fluid, a hydraulic pump, a motor 171 for driving the hydraulic pump, various valves, and hydraulic piping. The hydraulic unit 17 is mounted at the rear of the central frame 20.

[0042] The coupling device 15 (see Figure 4) has a hydraulic cylinder 811 as an actuator for raising and lowering the work equipment 19. The hydraulic unit 17 of the vehicle body 11 has hydraulic piping for supplying hydraulic pressure to the coupling device 15 (hydraulic cylinder 811). Furthermore, when the work equipment 19 is operated hydraulically, the hydraulic unit 17 has hydraulic piping for supplying hydraulic pressure to the work equipment 19. These hydraulic pipes are connected to a vehicle-side coupling (not shown) of the vehicle body 11. The vehicle-side coupling is provided at the rear of the vehicle body 11 (central frame 20) and at the lower fixing portion 41.

[0043] When the coupling device 15 is attached to the fixing portion 41 of the vehicle body 11, the coupling of the coupling device 15 is connected to the vehicle-side coupling. The hydraulic piping of the coupling device 15 is connected to this coupling, and hydraulic fluid from the hydraulic unit 17 is supplied through the hydraulic piping to the hydraulic cylinder 811 of the coupling device 15 and the hydraulic equipment of the work machine 19.

[0044] The cooling unit 23 (see FIG. 3) includes a first cooling unit 231 that cools the battery 16 (16A, 16L, 16R), a second cooling unit 232 that cools the motor 171 that drives the hydraulic pump of the hydraulic unit 17, etc., and a third cooling unit 233 that cools the motor 26 of the traveling device 12. Each cooling unit has a heat exchanger or the like for cooling the cooling medium.

[0045] The first cooling unit 231 and the second cooling unit 232 are mounted on the central frame 20 and are located in front of the first battery 16A. The third cooling unit 233 is mounted on the front part of each of the side frames 21L and 21R. In the case of this embodiment, the first cooling unit 231 is air-cooled, and the second cooling unit 232 and the third cooling unit 233 are water-cooled.

[0046] The work vehicle 10 (see FIG. 6) has a junction box 24 and an inverter 31 connected to each motor. In the case of this embodiment, the junction box 24 has a main junction box 24A and sub-junction boxes 24L and 24R. The main junction box 24A is mounted on the central frame 20. The sub-junction boxes 24L and 24R are mounted on the side frames 21L and 21R. Each inverter 31 receives power from the main junction box 24A or the sub-junction boxes 24L and 24R and outputs a predetermined power to each motor.

[0047] The work vehicle 10 has a charging port 32, a DC-DC converter 33, and an OBC / DC-DC converter 34. The DC-DC converter 33 transforms (steps down or steps up) the power supplied from the battery 16A to supply other electrical devices such as the control device 14. The OBC / DC-DC converter 34 includes an on-board charger and a DC-DC converter. The OBC / DC-DC converter 34 is connected to the charging port 32. The charging port 32 is attached to the vehicle body 11 and is connected to an external power source arranged on a charging stand or the like. The OBC / DC-DC converter 34 converts the power supplied from the charging port 32 into power for charging the battery 16A.

[0048] [Case] As shown in FIGS. 2, 3, and 5, the work vehicle 10 has a case 200 that houses at least one of the plurality of batteries 16. In the present embodiment, the plurality of batteries 16 include a first battery 16A mounted on the central frame 20, a second battery 16L mounted on the left side frame 21L, and a second battery 16R mounted on the right side frame 21R. The case 200 of the present embodiment includes a first case 205, a second case 215L, and a second case 215R.

[0049] The first case 205 is mounted on the central frame 20. The first case 205 houses the first battery 16A, which is a part of the plurality of batteries 16. The second case 215L is mounted on the left side frame 21L. The second case 215L houses the left second battery 16L that is not housed in the first case 205. The second case 215R is mounted on the right side frame 21R (see FIG. 3). The second case 215R houses the second battery 16R that is not housed in the first case 205.

[0050] As described above, in the configuration shown in Figure 7, each of the side frames 21L and 21R can be displaced in the left-right direction relative to the central frame 20 by the displacement actuator 13. This left-right displacement causes the second cases 215L and 215R mounted on the side frames 21L and 21R to move in the left-right direction relative to the first case 205 mounted on the central frame 20. In the configurations shown in Figures 8 and 9, the central frame 20 can be displaced in the up-down or front-back direction relative to each of the side frames 21L and 21R by the displacement actuator 13. In the configuration shown in Figure 10, the first case 205 can be displaced in the front-back direction relative to the central frame 20 by the displacement actuator 13. As a result, in the configurations shown in Figures 8 to 10, the first case 205 mounted on the central frame 20 moves in the up-down or front-back direction relative to the second cases 215L and 215R mounted on the side frames 21L and 21R. As described above, in each of the embodiments shown in Figures 7 to 10, the relative position of the first case 205 changes with respect to the second cases 215L and 215R, respectively. Therefore, the displacement actuator 13 functions as a movement mechanism that changes the relative position of the first case 205 with respect to the second cases 215L and 215R, respectively.

[0051] [Cooling Unit] Figure 11 is an explanatory diagram showing the general configuration of the cooling unit 23, the first battery 16A, and its surroundings. Figure 11 shows these as viewed from the left side. As described above, the cooling unit 23 has a first cooling unit 231 that cools the battery 16 (16A, 16L, 16R) and a second cooling unit 232 that cools the motor 171, etc. The first cooling unit 231, which is air-cooled, is located above the second cooling unit 232, which is water-cooled. That is, in a plan view, the first cooling unit 231, which is air-cooled, is located so as to overlap with the second cooling unit 232, which is water-cooled.

[0052] The cooling unit 23 (first cooling unit 231 and second cooling unit 232) is housed together with the first battery 16A in the first case 205. Within the first case 205, the cooling unit 23 is positioned in front of the first battery 16A. The first case 205 has a partition wall separating the cooling unit 23 from the first battery 16A, but the first case 205 is a box with an integrated structure.

[0053] The air-cooled first cooling unit 231 has an air-cooled heat exchanger (condenser and evaporator) 231a. The first cooling unit 231 has the function of cooling the cooling medium by a cooling cycle. The first cooling unit 231 discharges a cooling medium for cooling the first battery 16A and the second batteries 16L and 16R. In addition to air, refrigerant gases and the like can also be used as the cooling medium.

[0054] A portion of the cooling medium discharged from the first cooling unit 231 flows through the first case 205, and in this process, the first battery 16A is cooled by the cooling medium. The cooling medium that has cooled the first battery 16A passes through another flow path 208 provided within the first case 205, returns to the first cooling unit 231, and is cooled again.

[0055] A portion of the cooling medium discharged from the first cooling unit 231 passes through the piping 50 (supply piping 51L, 51R) connected to the first case 205 and flows into the second cases 215L, 215R, which house the second batteries 16L, 16R. At this time, the second batteries 16L, 16R are cooled by the cooling medium. The cooling medium that has cooled the second batteries 16L, 16R passes through the piping 50 (return piping 52L, 52R) connected to the second cases 215L, 215R, respectively, and returns to the first case 205. The cooling medium that has returned to the first case 205 is drawn into the first cooling unit 231 and cooled again.

[0056] [Piping] Figures 12 and 13 are perspective views of the battery 16, case 200, and piping 50 from the front left and front right, respectively. Figure 14 is a perspective view of these from the rear. In Figures 12, 13, and 14, the work vehicle 10 has piping 50 through which a cooling medium flows. The piping 50 is connected to the case 200. The piping 50 in this embodiment is used to cool the second batteries 16L and 16R with a cooling medium, and has a pair of supply pipes 51L and 51R, and a pair of return pipes 52L and 52R.

[0057] The supply pipe 51L is a pipe for supplying a cooling medium from the first cooling unit 231 to the second case 215L on the left. The supply pipe 51L connects the first case 205 and the second case 215L. In this embodiment, the supply pipe 51L connects the left front side of the top surface of the first case 205 to the front side of the second case 215L (see Figure 12).

[0058] The supply pipe 51R is a pipe for supplying a cooling medium from the first cooling unit 231 to the second case 215R on the right. The supply pipe 51R connects the first case 205 and the second case 215R. In this embodiment, the supply pipe 51R connects the front right side of the upper surface of the first case 205 to the front side of the second case 215R (see Figure 13).

[0059] The return pipe 52L is a pipe for returning the cooling medium from the second case 215L on the left to the first cooling unit 231. The return pipe 52L connects the first case 205 and the second case 215L. In this embodiment, the return pipe 52L connects the left rear side of the upper surface of the first case 205 to the rear side of the second case 215L.

[0060] The return pipe 52R is a pipe for returning the cooling medium from the second case 215R on the right to the first case 205. The return pipe 52R connects the first case 205 and the second case 215R. In this embodiment, the return pipe 52R connects the right rear side of the upper surface of the first case 205 to the rear side of the second case 215R.

[0061] The cooling medium discharged from the first cooling unit 231 flows from the first case 205 through the supply pipes 51L and 51R and is supplied to the second cases 215L and 215R, respectively. The cooling medium supplied to the second cases 215L and 215R cools the second batteries 16L and 16R, respectively. The cooling medium that has cooled the second batteries 16L and 16R flows from the second cases 215L and 215R through the return pipes 52L and 52R and returns to the first case 205. The cooling medium that has returned to the first case 205 passes through the flow path 208 (see Figure 11) inside the first case 205 and is sucked into the first cooling unit 231, where it is cooled again.

[0062] As described above, the displacement actuators 13 cause the side frames 21L and 21R to be displaced in the left-right direction relative to the central frame 20, thereby changing the relative positions of the second cases 215L and 215R with respect to the first case 205 in the left-right direction. Additionally, the displacement actuators 13 cause the central frame 20 to be displaced in the up-down or front-back direction relative to the side frames 21L and 21R, respectively, or the first case 205 to be displaced in the front-back direction relative to the central frame 20, thereby changing the relative position of the first case 205 with respect to the second cases 215L and 215R in the up-down or front-back direction. Each supply pipe 51L and 51R has a plurality of flexible parts 511, 512, and 513 that move in accordance with the change in relative position, and a plurality of non-flexible parts 514, 515, 516, and 517 that do not move even when the relative position changes.

[0063] Each return pipe 52L, 52R has a plurality of flexible parts 521, 522 that move in accordance with the change in relative position, and a plurality of non-flexible parts 523, 524, 525 that do not move even when the relative position changes. In Figures 11 to 13, the flexible parts 511 to 513 and 521 to 522 are shown in gray, and the non-flexible parts 514 to 517 and 523 to 525 are shown in white.

[0064] Each of the flexible sections 511-513 and 521-522 is, for example, a resin pipe formed in a bellows shape, and is capable of expansion, contraction, and bending deformation. Each of the flexible sections 511-513 and 521-522 moves by expanding, contraction, and bending deformation in response to the change in their relative positions. Each of the non-flexible sections 514-517 and 523-525 is, for example, a metal pipe that is difficult to deform, and does not deform even when the relative positions change. Each of the non-flexible sections 514-517 and 523-525 in this embodiment is an elbow-shaped pipe and functions as a curved section in which the direction of extension of the pipe 50 changes.

[0065] In each of the supply pipes 51L and 51R, the flexible sections 511 to 513 and the non-flexible sections 514 to 517 are connected alternately. In each of the supply pipes 51L and 51R of this embodiment, the non-flexible section 514, flexible section 511, non-flexible section 515, flexible section 512, non-flexible section 516, flexible section 513, and non-flexible section 517 are connected in this order from the first case 205 toward each of the second cases 215L and 215R. Since the pair of supply pipes 51L and 51R are arranged symmetrically, the left supply pipe 51L will be described below, and the right supply pipe 51R will be given the same reference numerals and its description will be omitted.

[0066] The non-flexible portion 514 (see Figure 13) of the supply pipe 51L is located above the first case 205. The non-flexible portion 514 is a curved section in which the direction of extension of the pipe 50 changes, as described above, and has a curved body 514a and a first end 514b and a second end 514c that extend in different directions from each other. The first end 514b of the non-flexible portion 514 extends downward from the curved body 514a and is connected to the upper surface of the first case 205. The second end 514c of the non-flexible portion 514 extends diagonally to the left and rear from the curved body 514a. One end of the flexible portion 511 is connected to the second end 514c of the non-flexible portion 514.

[0067] The flexible portion 511 extends diagonally to the left and rear from the second end 514c of the non-flexible portion 514. The non-flexible portion 515 is connected to the other end of the flexible portion 511. The flexible portion 511 can expand and contract in the left-right direction, mainly when displacing the relative position of the first case 205 and the second case 215L in the left-right direction (see Figure 7).

[0068] The non-flexible section 515 (see Figure 13) is a curved section in which the direction of extension of the pipe 50 changes, as described above, and has a curved body 515a and a first end 515b and a second end 515c that extend in different directions from each other. The first end 515b of the non-flexible section 515 extends diagonally forward to the right from the curved body 515a and is connected to the other end of the flexible section 511. The second end 515c of the non-flexible section 515 extends rearward from the curved body 515a. One end of the flexible section 512 is connected to the second end 515c of the non-flexible section 515.

[0069] The flexible portion 512 extends rearward from the second end 515c of the non-flexible portion 515. The non-flexible portion 516 is connected to the other end of the flexible portion 512. The flexible portion 512 can expand and contract in the front-rear direction, mainly when displacing the relative position of the first case 205 and the second case 215L in the front-rear direction (see Figures 9 and 10).

[0070] The non-flexible section 516 (see Figure 13) is a curved section in which the direction of extension of the pipe 50 changes, as described above, and has a curved body 516a and a first end 516b and a second end 516c that extend in different directions from each other. The first end 516b of the non-flexible section 516 extends forward from the curved body 516a and is connected to the other end of the flexible section 512. The second end 516c of the non-flexible section 516 extends downward from the curved body 516a. One end of the flexible section 513 is connected to the second end 516c of the non-flexible section 516.

[0071] The flexible portion 513 extends downward from the second end 516c of the non-flexible portion 516. The non-flexible portion 517 is connected to the other end of the flexible portion 513. The flexible portion 513 can expand and contract in the vertical direction, mainly when displacing the relative position of the first case 205 and the second case 215L in the vertical direction (see Figure 8).

[0072] The non-flexible section 517 (see Figure 12) is a curved section in which the direction of extension of the pipe 50 changes, as described above, and has a curved body 517a and a first end 517b and a second end 517c that extend in different directions from each other. The first end 517b extends upward from the curved body 517a and is connected to the other end of the flexible section 513. The second end 517c extends rearward from the curved body 517a and is connected to the front side of the second case 215L.

[0073] In each of the return pipes 52L and 52R, the flexible sections 521 to 522 and the non-flexible sections 523 to 525 are connected alternately. In each of the return pipes 52L and 52R of this embodiment, the non-flexible section 523, flexible section 521, non-flexible section 524, flexible section 522, and non-flexible section 525 are connected in this order from the first case 205 toward each of the second cases 215L and 215R. Since the pair of return pipes 52L and 52R are arranged symmetrically, the left return pipe 52L will be described below, and the right return pipe 52R will be given the same reference numerals and its description will be omitted.

[0074] The non-flexible portion 523 (see Figure 12) of the return pipe 52L is located above the first case 205. The non-flexible portion 523 is a curved section in which the direction of extension of the pipe 50 changes, as described above, and has a curved body 523a and a first end 523b and a second end 523c that extend in different directions from each other. The first end 523b of the non-flexible portion 523 extends downward from the curved body 523a and is connected to the upper surface of the first case 205. The second end 523c of the non-flexible portion 523 extends diagonally to the left and rear from the curved body 523a. One end of the flexible portion 521 is connected to the second end 523c of the non-flexible portion 523.

[0075] The flexible portion 521 extends diagonally to the left and rear from the second end 523c of the non-flexible portion 523. The non-flexible portion 524 is connected to the other end of the flexible portion 521. The flexible portion 521 can expand and contract in the left-right direction or the front-back direction, mainly when displacing the relative position of the first case 205 and the second case 215L in the left-right direction (see Figure 7), or when displacing it in the front-back direction (see Figures 9 and 10).

[0076] The non-flexible portion 524 (see Figure 12) is a curved portion in which the direction of extension of the pipe 50 changes, as described above, and has a curved body 524a and a first end 524b and a second end 524c that extend in different directions from each other. The first end 524b of the non-flexible portion 524 extends diagonally forward to the right from the curved body 524a and is connected to the other end of the flexible portion 521. The second end 524c of the non-flexible portion 524 extends downward from the curved body 524a. One end of the flexible portion 522 is connected to the second end 524c of the non-flexible portion 524.

[0077] The flexible portion 522 extends downward from the second end 524c of the non-flexible portion 524. The non-flexible portion 525 is connected to the other end of the flexible portion 522. The flexible portion 522 can expand and contract in the vertical direction, mainly when displacing the relative position between the first case 205 and the second case 215L in the vertical direction (see Figure 8).

[0078] The non-flexible portion 525 (see Figure 14) is a curved portion in which the direction of extension of the pipe 50 changes, as described above, and has a curved body 525a and a first end 525b and a second end 525c extending in different directions from each other. The first end 525b extends upward from the curved body 525a and is connected to the other end of the flexible portion 522. The second end 525c extends forward from the curved body 525a and is connected to the rear side of the second case 215L. The number of flexible portions and non-flexible portions in a single pipe 50 is not limited to this embodiment.

[0079] [Support Members] As shown in Figures 3 to 5, the work vehicle 10 has support members 61 and 62 that support the piping 50. Note that the support members 61 and 62 are not shown in Figures 12 to 14. One of the support members 61 supports the respective supply pipes 51L and 51R. In this embodiment, the support member 61 has support members 61LF and 61LR that support the front and rear sides of the left supply pipe 51L, respectively, and support members 61RF and 61RR that support the front and rear sides of the right supply pipe 51R, respectively.

[0080] The other support member 62 supports the respective return pipes 52L and 52R. In this embodiment, the support member 62 has support members 62LF and 62LR that support the front and rear sides of the left return pipe 52L, respectively, and support members 62RF and 62RR that support the front and rear sides of the right return pipe 52R, respectively.

[0081] Figure 15 is a rear perspective view of the support members 61LF and 61RF that support the front sides of the supply pipes 51L and 51R, respectively, and the support members 62LF and 62RF that support the front sides of the return pipes 52L and 52R, respectively. Figure 16 is a front perspective view of these support members 61LF, 61RF, 62LF, and 62RF. As shown in Figures 15 and 16, the support members 61LF and 61RF are provided on the upper surface of the first case 205 in an upper position between the air-cooled heat exchanger 231a of the first cooling unit 231 and the first battery 16A (see also Figure 11). The support members 62LF and 62RF are provided behind the support members 61LF and 61RF in a rear position on the upper surface of the first case 205 relative to the first battery 16A (see also Figure 11). The support members 62LF and 62RF may be provided behind the support members 61LF and 61RF, and above the first battery 16A on the upper surface of the first case 205.

[0082] As described above, the relative positions of the second cases 215L and 215R with respect to the first case 205 change in the left-right direction, and the relative position of the first case 205 with respect to the second cases 215L and 215R change in the up-down or front-back direction. Due to these changes in relative positions, the first case 205 moves relative to the second cases 215L and 215R in the left-right, up-down, or front-back directions. Since the support members 61LF, 61RF, 62LF, and 62RF are provided on the first case 205 as described above, they can move relative to the first case 205 in the left-right, up-down, or front-back directions in response to the changes in relative positions.

[0083] Figure 17 is an enlarged perspective view from the front of the support members 61LF and 61RF, which support the front sides of the supply pipes 51L and 51R, respectively. Since these support members 61LF and 61RF are configured symmetrically, the configuration of the left support member 61LF will be described below, and the configuration of the right support member 61RF will be given the same reference numerals, and its description will be omitted.

[0084] As shown in Figures 15 and 17, the left support member 61LF supports the non-flexible portion (curved portion) 514, which is the front part of the supply pipe 51L. The support member 61LF has a mounting portion 611 provided on the first case 205, and a first support portion 616 and a second support portion 617 attached to the mounting portion 611.

[0085] The mounting portion 611 includes a base 612, a support column 613 attached to the base 612, and a first stay 614 and a second stay 615 attached to the support column 613. The base 612 is positioned on the upper surface of the first case 205, close to the rear side of the non-flexible portion 514, and is fixed to the first case 205 by bolts (not shown).

[0086] The support column 613 consists of a rod member formed, for example, in an inverted L shape. The support column 613 has a first column portion 613a that extends vertically and a second column portion 613b that extends diagonally to the left and rear from the upper end of the first column portion 613a. The first column portion 613a extends vertically parallel to the first end portion 514b at a position close to the rear side of the first end portion 514b of the non-flexible portion 514. The lower end of the first column portion 613a is fixed to the base 612 by a bolt (not shown). The second column portion 613b is located below the second end portion 514c of the non-flexible portion 514.

[0087] The first stay 614 is fixed to the upper and lower middle portion of the first column 613a. The first stay 614 is positioned between the first end 514b of the non-flexible portion 514 and the first column 613a. The second stay 615 is fixed to the left end (tip) of the second column 613b. The second stay 615 is positioned directly below the second end 514c of the non-flexible portion 514.

[0088] The first support portion 616 supports the first end portion 514b of the non-flexible portion 514. In this embodiment, the first support portion 616 is made of, for example, a U-bolt. The curved portion of the first support portion 616 engages with the outer circumference of the first end portion 514b of the non-flexible portion 514. Both ends of the first support portion 616 pass through the first stay 614 of the mounting portion 611, and nuts (not shown) are tightened onto both ends to fix the first support portion 616 to the first stay 614. As a result, the first end portion 514b of the non-flexible portion 514 is supported by the first support portion 616 in a fixed direction extending downward.

[0089] The second support portion 617 supports the second end portion 514c of the non-flexible portion 514. In this embodiment, the second support portion 617 is made of, for example, a band member formed in the shape of an annular end. The second support portion 617 is fixed to the second stay 615 of the mounting portion 611 by a bolt 63 or the like, while being engaged with the outer circumference of the second end portion 514c of the non-flexible portion 514. As a result, the second end portion 514c of the non-flexible portion 514 is supported by the second support portion 617 in a fixed direction, extending diagonally to the left and rear. The first support portion 616 may be a band member, similar to the second support portion 617. The second support portion 617 may be a U-bolt, similar to the first support portion 616.

[0090] As shown in Figures 15 and 16, the support members 62LF and 62RF that support the front sides of the return pipes 52L and 52R, respectively, are configured symmetrically. Therefore, the configuration of the left support member 62LF will be described below, and the configuration of the right support member 62RF will be given the same reference numerals, and its description will be omitted.

[0091] The left support member 62LF supports the non-flexible portion (curved portion) 523, which is the front part of the return pipe 52L. The support member 62LF has a mounting portion 621 provided on the first case 205, and a first support portion 626 and a second support portion 627 attached to the mounting portion 621.

[0092] The mounting portion 621 includes a base 622, a support column 623 attached to the base 622, and a first stay 624 and a second stay 625 attached to the support column 623. The base 622 is positioned on the upper surface of the first case 205, close to the right side of the non-flexible portion 523, and is fixed to the first case 205 by bolts (not shown).

[0093] The support column 623 consists of a rod member formed, for example, in an inverted L shape. The support column 623 has a first column portion 623a extending in the vertical direction and a second column portion 623b extending diagonally to the left and rear from the upper end of the first column portion 623a. The lower end of the first column portion 623a is fixed to the base 622. The second column portion 623b is located below the second end portion 523c of the non-flexible portion 523. The first stay 624 is fixed to the upper part of the first column portion 623a. The second stay 625 is fixed to the second column portion 613b.

[0094] The first support portion 626 supports the first end portion 523b of the non-flexible portion 523. In this embodiment, the first support portion 626 is made of, for example, a band member formed in the shape of an annular end. The first support portion 626 is fixed to the first stay 624 of the mounting portion 621 by a bolt (not shown) or the like, while being engaged with the outer circumference of the first end portion 523b of the non-flexible portion 523. As a result, the first end portion 523b of the non-flexible portion 523 is supported by the first support portion 626 while its downward extension direction is fixed.

[0095] The second support portion 627 supports the second end portion 523c of the non-flexible portion 523. In this embodiment, the second support portion 627 is made of, for example, a band member formed in the shape of an annular end. The second support portion 627 is fixed to the second stay 625 of the mounting portion 621 by a bolt (not shown) or the like, while being engaged with the outer circumference of the second end portion 523c of the non-flexible portion 523. As a result, the second end portion 523c of the non-flexible portion 523 is supported by the second support portion 627 in a fixed direction, extending diagonally to the left and rear. The first support portion 626 and the second support portion 627 of the support member 62LF may be U-bolts, similar to the first support portion 616 of the support member 61LF.

[0096] Figure 18 is a perspective view showing the support member 61LR that supports the rear side of the left supply pipe 51L. Note that the support member 61RR (see Figure 3) that supports the rear side of the right supply pipe 51R is configured symmetrically to the support member 61LR, so its explanation is omitted.

[0097] As shown in Figure 18, the support member 61LR supports the non-flexible portion (curved portion) 516, which is the rear part of the supply pipe 51L. The support member 61LR has a mounting portion 618 provided on the left side frame 21L and a support portion 619 attached to the mounting portion 618.

[0098] The mounting portion 618 consists of a plate member formed, for example, in a substantially L-shape. The mounting portion 618 has a horizontal plate portion 618a extending to the left and right, and a vertical plate portion 618b extending upward from the horizontal plate portion 618a. The horizontal plate portion 618a is positioned on the upper surface of the side frame 21L, below the first end portion 516b extending forward of the non-flexible portion 516, and is fixed to the side frame 21L by bolts 64. The vertical plate portion 618b extends upward from the right end portion of the horizontal plate portion 618a.

[0099] The support portion 619 supports the first end portion 516b of the non-flexible portion 516. The support portion 619 is made of, for example, a band member formed in the shape of an annular end. The support portion 619 is fixed to the vertical plate portion 618b of the mounting portion 618 by a bolt 65 or the like, while being engaged with the outer circumference of the first end portion 516b of the non-flexible portion 516. As a result, the first end portion 516b of the non-flexible portion 516 is supported by the support portion 619 while its forward extension direction is fixed. The support portion 619 of the support member 61LR may be a U-bolt, similar to the first support portion 616 of the support member 61LF.

[0100] The first end 516b of the non-flexible portion 516 is fixed to the side frame 21L by being supported by the support portion 619 of the support member 61LR. Therefore, when the central frame 20 is displaced vertically relative to the side frame 21L (see Figure 8), the vertical movement of the non-flexible portion 516 is restricted. Consequently, in response to the vertical displacement of the central frame 20, the flexible portion 513 located below the non-flexible portion 516 does not expand or contract vertically, while the flexible portions 511 and 512 located closer to the central frame 20 than the non-flexible portion 516 are bent vertically.

[0101] Figure 19 is a perspective view showing the support member 62LR that supports the rear side of the left return pipe 52L. Note that the support member 62RR (see Figure 3) that supports the rear side of the right return pipe 52R is configured symmetrically to the support member 62LR, so its explanation is omitted.

[0102] As shown in Figure 19, the support member 62LR supports the non-flexible portion (curved portion) 524, which is the rear part of the return pipe 52L. The support member 62LR has a mounting portion 628 provided on the left side frame 21L and a support portion 629 attached to the mounting portion 628.

[0103] The mounting portion 628 consists of a plate member formed, for example, in a roughly Z-shape. The mounting portion 628 has a first horizontal plate portion 628a extending left and right, a vertical plate portion 628b extending up and down, and a second horizontal plate portion 628c extending left and right. The first horizontal plate portion 628a is positioned on the upper surface of the side frame 21L, close to the left side of the first end portion 524b of the non-flexible portion 524 that extends diagonally forward to the right, and is fixed to the side frame 21L by bolts 66.

[0104] The vertical plate portion 628b extends upward from the right end of the first horizontal plate portion 628a to a position to the left of the first end portion 524b of the non-flexible portion 524. The second horizontal plate portion 628c extends to the right from the upper end of the vertical plate portion 628b toward the first end portion 524b of the non-flexible portion 524.

[0105] The support portion 629 supports the first end portion 524b of the non-flexible portion 524. The support portion 629 is made of, for example, a band member formed in the shape of an annular end. The support portion 629 is fixed to the second horizontal plate portion 628c of the mounting portion 628 by a bolt 67 or the like, while being engaged with the outer circumference of the first end portion 524b of the non-flexible portion 524. As a result, the first end portion 524b of the non-flexible portion 524 is supported by the support portion 629 in a fixed direction, extending diagonally forward to the right. The support portion 629 of the support member 62LR may be a U-bolt, similar to the first support portion 616 of the support member 61LF.

[0106] The first end 524b of the non-flexible portion 524 is fixed to the side frame 21L by being supported by the support portion 629 of the support member 62LR. Therefore, when the central frame 20 is displaced vertically relative to the side frame 21L (see Figure 8), the vertical movement of the non-flexible portion 524 is restricted. Consequently, in response to the vertical displacement of the central frame 20, the flexible portion 522 located below the non-flexible portion 524 does not expand or contract vertically, while the flexible portion 521 located closer to the central frame 20 than the non-flexible portion 524 bends vertically.

[0107] [Modified Support Member] Figure 20 is a perspective view showing a modified support member 61LR that supports the rear side of the left supply pipe 51L. As shown in Figure 20, the support member 61LR of this modified version differs from the support member 619 of the support member 61LR shown in Figure 18 in the configuration of the support portion 619 that supports the first end portion 516b of the non-flexible portion 516. The support portion 619 of the support member 61LR of this modified version consists of a plate member formed in a substantially U shape. The support portion 619 has a receiving plate portion 619a that extends to the left and right, and a pair of side plate portions 619b that extend vertically.

[0108] The receiving plate portion 619a of the support portion 619 is positioned directly below the first end portion 516b of the non-flexible portion 516 and is fixed to the upper end of the vertical plate portion 618b of the mounting portion 618. The pair of side plate portions 619b of the support portion 619 extend upward from the left and right side edges of the receiving plate portion 619a. The first end portion 516b of the non-flexible portion 516 and the rear end portion of the flexible portion 512 are placed on the upper surface of the receiving plate portion 619a between the pair of side plate portions 619b.

[0109] As a result, the first end 516b of the non-flexible portion 516 and the rear end of the flexible portion 512 are supported while resting on the receiving plate portion 619a of the support portion 619. Therefore, when the central frame 20 is displaced vertically relative to the side frame 21L (see Figure 8), the non-flexible portion 516 of the supply pipe 51L can move vertically together with the central frame 20 without being obstructed by the support portion 619 of the support member 61LR. Consequently, the flexible portion 513 of the supply pipe 51L can expand and contract vertically in accordance with the vertical displacement of the central frame 20.

[0110] In this modified example, the support portion 619 supports the non-flexible portion 516 and the flexible portion 512, but it is sufficient if it supports at least the non-flexible portion 516. The support portion 619 in this modified example may also be applied to the support member 61RR that supports the rear side of the right supply pipe 51R, and to the support members 62LR and 62RR that support the rear sides of the left and right return pipes 52L and 52R, respectively.

[0111] [Effects of the Embodiment] According to the work vehicle 10 of this embodiment, the piping 50 connected to the first case 205 housing the first battery 16A and the cooling unit 23 is supported by support members 61 and 62 provided on the first case 205. This prevents problems such as the piping 50 connected to the first case 205 being damaged due to interference with other components when the work vehicle 10 is in motion.

[0112] To cool the second batteries 16L and 16R housed in the second cases 215L and 215R with a cooling medium, the piping 50 connecting the first case 205 to each of the second cases 215L and 215R is supported by support members 61 and 62. This prevents the cooling medium from leaking due to damage to the piping 50, for example, when the work vehicle 10 is in motion.

[0113] As the relative position of the first case 205 with respect to each of the second cases 215L and 215R changes in the vertical or horizontal direction, or as the relative position of each of the second cases 215L and 215R with respect to the first case 205 changes in the horizontal direction, the first case 205 moves relative to each of the second cases 215L and 215R. The support members 61 and 62 are movable relative to the first case 205 in accordance with the change in relative position. As a result, the support members 61 and 62 can support the piping 50 even when the relative position changes.

[0114] The support members 61 and 62 support the non-flexible portions 514 and 523 in the piping 50 that do not move even when their relative positions change. As a result, the support members 61 and 62 can reliably support the piping 50.

[0115] The support members 61 and 62 support the curved portion (non-flexible portion 514-517, 523-525) of the pipe 50 where the direction of extension changes. As a result, even if the direction of extension of the pipe 50 changes, the support members 61 and 62 can stably support the pipe 50.

[0116] The support members 61 and 62 have first support parts 616, 626 and second support parts 617, 627 that support the first end parts 514b, 523b and second end parts 514c, 523c of the curved portion (non-flexible portion 514, 523) in a fixed direction of extension. This allows the pipe 50 having the curved portion (non-flexible portion 514, 523) to be supported more stably.

[0117] The support members 61 and 62 have mounting portions 611 and 621 to which the first support portions 616 and 626 and the second support portions 617 and 627 are attached. This allows the first support portions 616 and 626 and the second support portions 617 and 627 to be easily attached to the first case 205 via the mounting portions 611 and 621.

[0118] [Other] The embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is not limited to the embodiments described above, and includes all modifications within the scope of equivalence to the configurations described in the claims. For example, the first case 205 may house a plurality of batteries 16. Similarly, each of the second cases 215L, 215R may house a plurality of batteries 16.

[0119] The support members 61LF, 61RF, 62LF, and 62RF are provided on the upper surface of the first case 205, but may also be provided on a surface other than the upper surface of the first case 205 (such as the side). The left support members 61LR and 62LR are provided on the left side frame 21L, but may also be provided on the left second case 215L. Similarly, the right support members 61RR and 62RR are provided on the right side frame 21R, but may also be provided on the right second case 215R.

[0120] 10 Work vehicle 13 Displacement actuator (movement mechanism) 23 Cooling unit 50 Piping 61, 62 Support members 200 Case 205 First case 215L, 215R Second case 511, 512, 513, 521, 522 Flexible part 514, 523 Non-flexible part (curved part) 514b, 523b First end 514c, 523c Second end 611, 621 Mounting part 616, 626 First support part 617, 627 Second support part

Claims

1. A work vehicle comprising: a plurality of batteries; a cooling unit that discharges a cooling medium for cooling the plurality of batteries; a case that houses at least one of the plurality of batteries; piping connected to the case through which the cooling medium flows; and a support member provided in the case for supporting the piping.

2. The work vehicle according to claim 1, wherein the case includes a first case for housing the battery and the cooling unit, the piping is connected to the first case, and the support member is provided in the first case.

3. The work vehicle according to claim 2, wherein the case includes a second case for housing batteries among the plurality of batteries that are not housed in the first case, and the piping connects the first case and the second case in order to cool the batteries housed in the second case with the cooling medium.

4. The work vehicle according to claim 3, comprising a moving mechanism for changing the relative position of the first case with respect to the second case, wherein the support member is movable together with the first case in accordance with the change in the relative position.

5. The work vehicle according to claim 4, wherein the piping has a flexible portion that moves in accordance with the change in the relative position and a non-flexible portion that does not move even when the relative position changes, and the support member supports the non-flexible portion.

6. The work vehicle according to any one of claims 1 to 5, wherein the piping has a curved portion in which the direction of extension of the piping changes, and the support member supports the curved portion.

7. The work vehicle according to claim 6, wherein the curved portion has a first end and a second end extending in different directions from each other, and the support member has a first support portion that supports the first end while fixing the direction in which the first end extends.

8. The work vehicle according to claim 7, wherein the support member has a second support portion that supports the second end while fixing the direction in which the second end extends.

9. The work vehicle according to claim 8, wherein the support member has a mounting portion to which the first support portion and the second support portion are attached, and the mounting portion is provided on the case.

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