Work vehicles

Abstract

To provide a work vehicle with favorable vehicle balance. [Solution] The work vehicle 10 includes a central unit UC, a left travel unit UL located to the left of the central unit UC and supporting the front wheels 25 and rear wheels 25, a right travel unit UR located to the right of the central unit UC and supporting the front wheels 25 and rear wheels 25, a battery 16 mounted on the central unit UC, and a cooling unit 23 mounted on the central unit UC for cooling the mounted equipment. With respect to the center PC in the longitudinal direction of the central unit UC, the cooling unit 23 is located further outward in the longitudinal direction of the vehicle than the battery 16.

Description

Technical Field

[0001] The present invention relates to a work vehicle used for performing operations such as agricultural work.

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The work vehicle not only travels on a leveled road surface but also travels on a rough road surface, a road surface with unevenness, or an inclined road surface. In order for the work vehicle to travel stably on such road surfaces, setting the vehicle balance, that is, setting the center of gravity position of the work vehicle, is important. Here, the battery is heavy compared to other mounted devices. A cooling unit for cooling the battery, which is one of the mounted devices, may be relatively large in volume.

[0005] Therefore, an object of the present disclosure is to provide a work vehicle with a preferable vehicle balance by arranging each device such as the battery in a preferable arrangement.

Means for Solving the Problems

[0006] The work vehicle comprises a central unit, a left travel unit located to the left of the central unit and supporting the front and rear wheels, a right travel unit located to the right of the central unit and supporting the front and rear wheels, a battery mounted on the central unit and positioned between the left and right travel units, and a cooling unit mounted on the central unit for cooling the mounted equipment installed on the central unit, the left travel unit, or the right travel unit. The cooling unit and the battery are arranged front to back between the left and right drive units. With respect to the center of the central unit in the longitudinal direction, the cooling unit is positioned further outward in the longitudinal direction of the vehicle than the battery. [Effects of the Invention]

[0007] According to the present invention, a work vehicle with favorable vehicle balance in the front-rear direction can be obtained. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view showing one form of implementation using a work vehicle. [Figure 2] Figure 2 is a perspective view of the work vehicle. [Figure 3] Figure 3 is a plan view of the work vehicle shown in Figure 2. [Figure 4] Figure 4 is a left side view of the work vehicle shown in Figure 2. [Figure 5] Figure 5 is a right side view of the work vehicle shown in Figure 2. [Figure 6] Figure 6 is a diagram showing the configuration of the work vehicle. [Figure 7] Figure 7 is a schematic diagram showing a deformed work vehicle. [Figure 8] Figure 8 is a schematic diagram showing a deformed work vehicle. [Figure 9] Figure 9 is a schematic diagram showing a deformed work vehicle. [Figure 10]It is an explanatory diagram showing a schematic configuration of a cooling unit, a first battery, and its surroundings. [Figure 11] FIG. 11 is an explanatory diagram of a second cooling unit which is a water cooling unit. [Figure 12] FIG. 12 is an explanatory diagram showing a frame structure of a vehicle body. [Figure 13] FIG. 13 is an explanatory diagram of the linearity of piping. [Figure 14] FIG. 14 is an explanatory diagram of a support member. [Figure 15] FIG. 15 is an explanatory diagram when looking at a piping portion having a two-stage structure from the rear. [Figure 16] FIG. 16 is an explanatory diagram of a guide portion. [Figure 17] FIG. 17 is an explanatory diagram of a sliding plate.

Mode for Carrying Out the Invention

[0009] <Outline of Embodiment> Hereinafter, the outline of the embodiment of the invention will be listed and described. (1) The work vehicle of the present embodiment includes a central unit, a left traveling unit provided on the left side of the central unit and supporting front and rear wheels, a right traveling unit provided on the right side of the central unit and supporting front and rear wheels, a battery mounted on the central unit and located between the left traveling unit and the right traveling unit, and a cooling unit mounted on the central unit for cooling mounted equipment mounted on the central unit, the left traveling unit, or the right traveling unit. The cooling unit and the battery are arranged side by side in the front-rear direction between the left traveling unit and the right traveling unit. Based on the center in the front-rear direction of the central unit, the cooling unit is located outside the battery in the front-rear direction of the vehicle.

[0010] The battery is relatively heavy. The cooling unit tends to be relatively large in volume. According to the work vehicle, the battery is located closer to the center in the front-rear direction of the central unit than the cooling unit. Therefore, it becomes easier to set the center of gravity position of the work vehicle at the center in the front-rear direction, and a work vehicle with a preferable vehicle balance in the front-rear direction can be obtained.

[0011] (2) In the work vehicle of (1) above, the battery is located behind the cooling unit. (3) In the work vehicle of (1) or (2) above, the battery is included in the mounted equipment to be cooled by the cooling unit, and the cooling unit and the battery are arranged side by side in the front-rear direction. Since the cooling unit and the battery are arranged side by side in the front-rear direction, in order to cool the battery, the flow path through which the refrigerant flows from the cooling unit can be short.

[0012] (4) Any one of the work vehicles of (1) to (3) above has a common case for housing the battery and the cooling unit. A configuration that easily supplies the refrigerant sent from the cooling unit to the battery can be obtained.

[0013] (5) In any one of the work vehicles of (1) to (4) above, the cooling unit has an air-cooling unit for cooling a first mounted equipment among the plurality of mounted equipments, and a water-cooling unit for cooling a second mounted equipment among the plurality of mounted equipments. Water cooling and air cooling are used according to the mounted equipment to be cooled.

[0014] (6) In the work vehicle of (5) above, the air-cooling unit has an air-cooled heat exchanger for cooling the refrigerant for cooling the battery, and the air-cooling unit and the battery are arranged side by side in the front-rear direction. A configuration that easily supplies the refrigerant sent from the air-cooling unit to the battery can be obtained.

[0015] (7) In the work vehicle of (5) or (6) above, the water-cooling unit is located below the air-cooling unit. The above configuration is preferable as a countermeasure in case of coolant leakage in the water cooling unit.

[0016] (8) Any one of the work vehicles described in (5) to (7) above has piping extending from the water cooling unit through which coolant flows, and the piping passes below the battery and connects to a cooling channel for the mounted equipment located on the opposite side of the water cooling unit and behind the battery. The water-cooling unit is located towards the front of the work vehicle, but it can still cool the mounted equipment located towards the rear of the vehicle.

[0017] (9) Any one of the work vehicles described in (1) to (8) above has a hydraulic unit located on the opposite side of the cooling unit and rearward of the battery, and the mounted equipment is equipment included in the hydraulic unit. By positioning the heavy battery in front of the hydraulic unit, it becomes easier to set the center of gravity of the work vehicle in the center in the front-to-rear direction, resulting in a desirable front-to-rear vehicle balance.

[0018] (10) In any one of the work vehicles described in (1) to (9) above, the central unit comprises a central frame and a case for housing the battery, wherein the central frame comprises rails that support the case so as to be movable in the front-rear direction and actuators that move the case along the rails. For example, it becomes possible to adjust the vehicle's balance by changing the battery's position according to the shape of the road surface on which the work vehicle is traveling.

[0019] (11) In the work vehicle of (10) above, the case houses the cooling unit together with the battery, and the piping extending from the cooling unit to the mounted equipment at the rear includes a movable pipe that moves in the front-rear direction together with the case, and a flexible pipe connected to the movable pipe that bends as the case moves. Even if the case housing the cooling unit moves in the front-to-back direction along with the battery, and the distance between the cooling unit and the mounted equipment being cooled changes, this change is absorbed by the flexible tube.

[0020] (12) In the work vehicles described in (1) to (11) above, one or both of the left travel unit and the right travel unit and the central unit are relatively displaceable, and each has a displacement actuator that allows the travel unit to be displaced relative to the central unit. For example, the work vehicle will deform according to the shape of the road surface it is traveling on.

[0021] <Details of the Embodiment of the Invention> The embodiments of the invention will be described in detail below with reference to the drawings. At least some of the embodiments described below may be combined in any way.

[0022] [Overall configuration of work vehicles] Figures 1 and 2 are perspective views showing one embodiment of a 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 components of the work vehicle 10 and enhances its aesthetic appearance. Figures 3, 4, and 5 are a top 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.

[0023] 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".

[0024] The work vehicle 10 is capable of moving straight in both forward and backward directions, as well as turning left (left turn) and turning right (right turn), thanks to its running gear 12. The running gear 12 is located at four locations on the front, rear, left, and right sides 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 in a straight line in all 360 degrees. Note that an electric motor may be used instead of the hydraulic motor. Alternatively, the work vehicle 10 may be able to change the direction of the wheels 25 within a range of 0 to 90 degrees from the basic direction of travel by, for example, a hydraulic cylinder. When the direction of the wheels 25 changes by 90 degrees from the basic direction of travel, its rolling direction becomes either left or right. The work vehicle 10 can also move straight in either the left or right direction. 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 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 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.

[0025] 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.

[0026] 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.

[0027] The components of the work vehicle 10 will now be described. The work vehicle 10 has one vehicle body 11 and four running gears 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.

[0028] 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 attached, even if the work equipment 19 has been detached, and the work vehicle 10 can also run with both the coupling device 15 and the work equipment 19 detached from the vehicle body 11.

[0029] 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 having the designation "21L", and the right side frame 21 may be described as having the designation "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 usage conditions such as the shape of the road surface.

[0030] Figures 7, 8, and 9 are schematic diagrams showing a deformed work vehicle 10. As shown in Figures 7 and 8, the left side frame 21L and the right side frame 21R are each displaceable in the left-right direction relative to the central frame 20, and the central frame 20 is displaceable in the up-down direction relative to the left side frame 21L and the right side frame 21R. 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 relatively in the left-right and up-down directions.

[0031] 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 accordingly.

[0032] 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.

[0033] Furthermore, it is sufficient that the side frames 21L and 21R and the central frame 20 are relatively displaceable in either the vertical direction or the horizontal direction, or both. 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 and the central frame 20 to be displaced relatively.

[0034] The longitudinal deformation of the vehicle body 11 occurs within the central frame 20. That is, as shown in Figure 9, the central frame 20 mounts the battery 16 (first battery 16A) and the case 205 that houses the battery 16. The case 205 can be displaced in the longitudinal direction by the longitudinal actuators 133. By displacing the battery 16 in the longitudinal direction within the central frame 20, the center of gravity of the vehicle body 11 can be changed. The battery 16 (first battery 16A) is heavy. By moving the case 205 that houses the battery 16 (first battery 16A) in the front-to-back direction, the center of gravity of the vehicle body 11 can be changed. For example, when the work vehicle 10 travels on an inclined surface, the center of gravity is changed according to its posture or according to the work machine 19 that is attached to it.

[0035] As described above, the work vehicle 10 has a battery 16 (first battery 16A) and a case 205 that houses the battery 16 (first battery 16A). The case 205 is displaceable in the front-rear direction and is mounted on the central frame 20. The displacement actuator 13 displaces the case 205 in the front-rear direction within the central frame 20. The configuration for displacing the case 205 in the front-rear direction will be explained later.

[0036] 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.

[0037] 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 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".

[0038] 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.

[0039] 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 (hereinafter referred to as the left running unit UL) includes the left second battery 16L, the sub-junction box 24L, and inverters 31 connected to the two 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 (hereinafter referred to as the right running unit UR) includes the right second battery 16R mounted on the side frame 21R, the sub-junction box 24R, and inverters 31 connected to the two running motors 26, one at the front and one at the rear. The central frame 20 houses the first battery 16A, the hydraulic unit 17, and the main junction box 24A, and together these constitute the central unit UC. In this embodiment, as described above (see Figure 9), the 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.

[0040] As described above, the work vehicle 10 of this embodiment has a central unit UC, a left travel unit UL, and a right travel unit UR. The left travel unit UL is located to the left of the central unit UC and supports the front wheel (left front wheel 25) and the rear wheel (left rear wheel 25). The right travel unit UR is located to the right of the central unit UC and supports the front wheel (right front wheel 25) and the rear wheel (right rear wheel 25).

[0041] The left travel unit UL and the right travel unit UR, or one or both of them, and the central unit UC are relatively displaceable in the left-right and up-down directions. The work vehicle 10 has a displacement actuator 13 that allows the central unit UC and the aforementioned travel units (UL, UR) to be displaced relatively in the left-right and up-down directions. As a result, the work vehicle 10 (vehicle body 11) deforms according to the shape of the road surface it is traveling on. The first battery 16A is relatively heavy. By moving the case 205 that houses the first battery 16A in the front-to-back direction, the vehicle body 11 is deformed, resulting in a work vehicle 10 with favorable front-to-back vehicle balance when, for example, traveling on a slope.

[0042] 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 capable of swinging around its vertical axis. The steering actuator 29 is mounted between the side frame 21 and the running gear 12. The steering actuator 29 changes 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.

[0043] 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 various components of the work vehicle 10, including the travel device 12 (motor 26), displacement actuator 13, steering actuator 29, hydraulic unit 17, and cooling unit 23.

[0044] 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.

[0045] 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.

[0046] The cooling unit 23 (see Figure 3) includes a first cooling unit 231 for cooling the battery 16 (16A, 16L, 16R), a second cooling unit 232 for cooling the motor 171 that drives the hydraulic pump of the hydraulic unit 17, and a third cooling unit 233 for cooling the motor 26 of the traveling device 12. Each cooling unit has a heat exchanger or the like for cooling the cooling medium.

[0047] 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 of each of the side frames 21L and 21R. In this embodiment, the first cooling unit 231 is air-cooled, while the second cooling unit 232 and the third cooling unit 233 are water-cooled. The cooling unit 23 will be explained later.

[0048] The work vehicle 10 (see Figure 6) has a junction box 24 and inverters 31 connected to each motor. In 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 amount of power to each motor.

[0049] 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 to other electrical equipment such as the control device 14. The OBC / DC-DC converter 34 includes an onboard charger and a DC-DC converter. The OBC / DC-DC converter 34 is connected to the charging port 32. The charging port 32 is mounted on the vehicle body 11 and is connected to an external power source located at a charging station or the like. The OBC / DC-DC converter 34 converts the power supplied from the charging port 32 into power to charge the battery 16A.

[0050] [Connection device 15] The coupling device 15 is a device for connecting the work equipment 19 (see Figure 4) to the work vehicle 10. When attached to the vehicle body 11, the coupling device 15 connects the work equipment 19 to the vehicle body 11 and has a mechanism for raising and lowering the work equipment 19, and a mechanism for operating the work equipment 19. The coupling device 15 includes a lifting mechanism 70 and a motor 74 for the work implement 19. The motor 74 has a rotationally driven output shaft. The output shaft is connected to the input shaft of the work implement 19. Since the work implement 19 does not have a motor, the motor 74 of the coupling device 15 outputs power to the work implement 19. The motor 74 may include a reduction gear if necessary.

[0051] The lifting mechanism 70 includes a link mechanism 80 and an actuator (hydraulic cylinder 73). The link mechanism 80 includes an upper link member 85 and a lower link member 86, and in this embodiment, it is configured as a three-point link mechanism. One end of each of the upper link member 85 and the lower link member 86 is attached to a first mounting portion 71 on the vehicle body 11 side so as to be able to swing up and down, and the other end of each of the upper link member 85 and the lower link member 86 is attached to a second mounting portion 72 on the work machine 19 side so as to be able to swing up and down.

[0052] The hydraulic cylinder 73 operates by receiving hydraulic fluid supplied from the hydraulic unit 17 mounted on the vehicle body 11. The hydraulic cylinder 73 drives the upper link member 85 or the lower link member 86 up and down, raising and lowering the second mounting section 72 to which the work machine 19 is attached. Since the motor 74 is mounted on the second mounting section 72, the lifting mechanism 70 raises and lowers both the second mounting section 72 and the motor 74.

[0053] The link mechanism 80 and the actuator (hydraulic cylinder 73) may have configurations other than those shown in the figures. The lifting mechanism 70 may have a configuration other than that having a link mechanism 80, and if it has a link mechanism 80, the shape and number of link members included therein can be changed.

[0054] [Arrangement of battery 16, cooling unit 23, and other onboard equipment] As described above (see Figures 2 and 6), the work vehicle 10 has a battery 16, a hydraulic unit 17, and a cooling unit 23 as mounted equipment. The battery 16 comprises one first battery 16A and two second batteries 16L and 16R. The first battery 16A is mounted in the central unit UC and is located between the left drive unit UL and the right drive unit UR. One of the second batteries 16L is mounted in the left drive unit UL, and the other second battery 16R is mounted in the right drive unit UR.

[0055] Figure 10 is an explanatory diagram showing the schematic configuration of the cooling unit 23, the first battery 16A, and its surroundings. Figure 10 shows these components viewed from the left side. As described above, the cooling unit 23 has a first cooling unit 231 which is an air-cooled unit and a second cooling unit 232 which is a water-cooled unit. The water-cooled second cooling unit 232 is located below the air-cooled first cooling unit 231. The work vehicle 10 (central unit UC) has a common case 205 that houses the first battery 16A and the cooling unit 23 (first cooling unit 231 and second cooling unit 232). The cooling unit 23 and the first battery 16A (see Figure 3) are arranged front to back within the case 205, between the left travel unit UL and the right travel unit UR.

[0056] Although case 205 has a partition wall separating the cooling unit 23 and the first battery 16A, case 205 is a box with an integrated structure. The case 205 has a first case for housing the cooling unit 23 and a second case for housing the first battery 16A, and these first and second cases may be adjacent to each other and connected to form a single unit. The case 205 is made of metal, and the case 205 protects the cooling unit 23 and the first battery 16A from external impact forces, for example.

[0057] The first battery 16A is located behind the cooling unit 23 (first cooling unit 231 and second cooling unit 232). As shown in Figures 3 and 10, with respect to the center PC in the longitudinal direction of the central unit UC, the cooling unit 23 is located further outward in the longitudinal direction of the vehicle than the first battery 16A. In other words, the first battery 16A is located closer to the center PC than the cooling unit 23.

[0058] In the configuration shown in Figure 10, the air-cooled first cooling unit 231 and the water-cooled second cooling unit 232 are arranged vertically, but other arrangements are also possible, such as the air-cooled first cooling unit 231 and the water-cooled second cooling unit 232 being arranged front to back. In this case, the air-cooled first cooling unit 231 may be in the front, or the water-cooled second cooling unit 232 may be in the front.

[0059] The air-cooled first cooling unit 231 has an air-cooled heat exchanger (condenser and evaporator) 57. The first cooling unit 231 has the function of cooling the refrigerant (gas) by the cooling cycle. The first cooling unit 231 cools the refrigerant (gas) to cool the first battery 16A and the second batteries 16L and 16R.

[0060] The air-cooled first cooling unit 231 is a device for cooling the first of several mounted devices installed on the work vehicle 10. In this embodiment, the "first mounted device" includes the first battery 16A housed in the case 205. In this embodiment, the case 205 houses the first cooling unit 231 and the second cooling unit 232. The cold air generated by the first cooling unit 231 flows through the case 205, cooling the first battery 16A in the process. The refrigerant that has passed through the first battery 16A then passes through another flow path 208 located within the case 205, returns to the first cooling unit 231, and is cooled again.

[0061] In this embodiment, the "first mounted equipment" to be cooled by the air-cooled first cooling unit 231 includes the second batteries 16L and 16R. The cool air generated by the first cooling unit 231 is supplied to the second batteries 16L and 16R through an upper duct 55 connected to the case 205. The duct 55 is located on the upper part of the vehicle body 11, as shown in Figure 2 (see Figure 2).

[0062] The left travel unit UL has a battery case 56 that houses the second battery 16L. The cold air generated by the first cooling unit 231 flows through the first duct 551 on the left front side to the battery case 56 of the second battery 16L. At this time, the second battery 16L on the left side is cooled. The cold air (refrigerant) that has passed through the battery case 56 flows through the second duct 552 on the left rear side to the central case 205 (see Figure 10). In case 205, the refrigerant used to cool the second battery 16L on the left side returns to the first cooling unit 231 and is cooled again.

[0063] Similarly, the right-hand drive unit UR has a battery case 56 that houses the second battery 16R. The cold air generated by the first cooling unit 231 flows through the first duct 551 on the right front side (see Figure 2) to the battery case 56 of the second battery 16R. At this time, the second battery 16R on the right side is cooled. The cold air (refrigerant) that has passed through the battery case 56 flows through the second duct 552 on the right rear side to the central case 205 (see Figure 10). In case 205, the refrigerant used to cool the second battery 16L on the right side returns to the first cooling unit 231 and is cooled again.

[0064] As described above, the first battery 16A is cooled by the refrigerant cooled by the first cooling unit 231. Furthermore, the second batteries 16L and 16R are cooled by the refrigerant cooled by the first cooling unit 231.

[0065] Figure 11 is an explanatory diagram of the second cooling unit 232, which is a water-cooling unit. The water-cooled second cooling unit 232 is a device for cooling the second of several mounted devices installed on the work vehicle 10. In this embodiment, the "second mounted device" includes a hydraulic unit 17. The hydraulic unit 17 has a motor 171 that drives a hydraulic pump and an inverter 172 that outputs power to the motor 171. The motor 171 and inverter 172 are cooled by the coolant (refrigerant) cooled by the second cooling unit 232.

[0066] To cool the components of the hydraulic unit 17, such as the motor 171, the work vehicle 10 has a pipe 65 through which coolant flows, extending from a water-cooled second cooling unit 232 (see Figure 10). The pipe 65 passes below the first battery 16A and connects to the cooling passage of a second mounted equipment located on the opposite side of the second cooling unit 232 and behind the first battery 16A. Specifically, the pipe 65 passes below the first battery 16A, crosses the center PC in the front-rear direction of the central unit UC to the rear, and connects to the cooling passage of a second mounted equipment located behind the center PC. This second mounted equipment is the motor 171 and inverter 172 of the hydraulic unit 17. The coolant flowing through the pipe 65 is supplied to the cooling passages, such as the cooling jackets, of the motor 171 and inverter 172, respectively. The water-cooled second cooling unit 232 is located towards the front of the work vehicle 10, but it is capable of cooling the second mounted equipment (such as the motor 171 of the hydraulic unit 17) located towards the rear of the work vehicle 10.

[0067] The cooling unit 23 is located outside the first battery 16A in the vehicle's longitudinal direction (one side, i.e., the front side) relative to the center PC in the longitudinal direction of the central unit UC. In contrast, the second mounted equipment, the hydraulic unit 17 (motor 171), is located outside the first battery 16A in the vehicle's longitudinal direction (the other side, i.e., the rear side) relative to the center PC in the longitudinal direction of the central unit UC. The cooling unit 23, the first battery 16A, and the hydraulic unit 17 are arranged in this order from front to back, and they are positioned front to back between the left and right travel units UL and UR.

[0068] In this embodiment, the "second mounted equipment" further includes the motor 74 and inverter 75 of the coupling device 15. The motor 74 of the coupling device 15 is a motor that outputs power to the work machine 19 attached to the vehicle body 11 via the coupling device 15. The inverter 75 of the coupling device 15 outputs power to the motor 74. The motor 74 and inverter 75 of the coupling device 15 are cooled by the coolant (refrigerant) cooled by the second cooling unit 232.

[0069] The second cooling unit 232 (see Figure 11) has a radiator 53 with a fan and an electric pump. In this embodiment, the electric pump has a first electric pump 51 and a second electric pump 52. The radiator 53 cools the coolant liquid, which is the refrigerant. The first electric pump 51 sends the coolant liquid to the motor 171 and inverter 172 of the hydraulic unit 17 through the piping 65. The second electric pump 52 sends the coolant liquid to the motor 74 and inverter 75 of the coupling device 15 through the piping 65.

[0070] As described above, the work vehicle 10 has a first cooling unit 231 and a second cooling unit 232 as a cooling unit 23 mounted on the central unit UC. The cooling unit 23 is used to cool the equipment mounted on the central unit UC, namely the first battery 16A and the hydraulic unit 17. Furthermore, the cooling liquid cooled by the cooling unit 23 (second cooling unit 232) may also cool other mounted equipment (see Figure 6), such as the DC-DC converter 33, the OBC / DC-DC converter 34, and the control device 14.

[0071] In this embodiment, the second battery 16L, which is mounted on the left travel unit UL, and the second battery 16R, which is mounted on the right travel unit UR, are also cooled using the cooling unit 23 (air-cooled first cooling unit 231). The cooling unit 23 may be configured to cool the mounted equipment installed on the central unit UC, the left travel unit UL, or the right travel unit UR. Although not shown in the figures, the second batteries 16L and 16R may be cooled using a separate cooling unit (cooling device).

[0072] The arrangement of the first battery 16A, cooling unit 23, and hydraulic unit 17 in the work vehicle 10 (central unit UC) will be described below. The first battery 16A is relatively heavy. The cooling unit 23 (first cooling unit 231 and second cooling unit 232) tends to be relatively large in volume.

[0073] As described above, with reference to the center PC in the longitudinal direction of the central unit UC, the cooling unit 23 is located further outward in the longitudinal direction of the vehicle than the first battery 16A. In other words, the first battery 16A is located closer to the center PC in the longitudinal direction of the central unit UC than the cooling unit 23. This makes it easier to set the center of gravity of the work vehicle 10 in the center in the longitudinal direction, resulting in a work vehicle 10 with favorable longitudinal vehicle balance.

[0074] As described above, the case 205 housing the first battery 16A and the cooling unit 23 is displaced in the front-rear direction within the central unit UC. Since the first battery 16A, which is heavy, is located close to the center PC in the front-rear direction of the central unit UC, even if the case 205 is displaced forward within the central unit UC, the vehicle balance in the front-rear direction remains favorable for the work vehicle 10.

[0075] As shown in Figures 4 and 5, whether the case 205 is moved to its furthest rear position or to its furthest forward position, the case 205 housing the cooling unit 23 protrudes forward of the vehicle body 11, that is, it protrudes forward of the central frame 20. Whether case 205 is in its furthest rearward position (see Figures 4 and 5) or its furthest forward position, the rear end 161 of the first battery 16A is located between the center 25cf of the front wheel 25 and the center cr of the rear wheel 25.

[0076] The hydraulic unit 17 is located on the opposite side of the cooling unit 23 in the front-rear direction, and behind the first battery 16A. The first battery 16A, being a heavy object, is located in front of the hydraulic unit 17, so the first battery 16A is positioned closer to the center in the front-rear direction. The rearward positioning of the hydraulic unit 17 makes it easier to set the center of gravity of the work vehicle 10 in the front-rear direction.

[0077] As explained in Figure 10, the mounted equipment to be cooled by the cooling unit 23 (first cooling unit 231) includes the first battery 16A. The first battery 16A and the cooling unit 23 (first cooling unit 231) are positioned one behind the other. By positioning the first battery 16A and the cooling unit 23 (first cooling unit 231) one behind the other, the flow path for the refrigerant from the first cooling unit 231 to cool the first battery 16A can be kept short.

[0078] Furthermore, the first battery 16A and the cooling unit 23 (first cooling unit 231 and second cooling unit 232) are arranged front to back and housed in a common case 205. This configuration makes it easy to supply the refrigerant from the first cooling unit 231 to the first battery 16A. Furthermore, as a countermeasure in case of coolant leakage in the water-cooled second cooling unit 232, the second cooling unit 232 is located below the air-cooled first cooling unit 231, as shown in Figure 10.

[0079] In this embodiment, since the first cooling unit 231 and the second cooling unit 232 are positioned in the same location in the front-rear direction, space can be saved in the vehicle body 11. The cooling unit 23 and the first battery 16A are integrated and arranged in the case 205, which allows for space saving and contributes to the miniaturization of the work vehicle 10.

[0080] [Mechanism for displacing case 205] Figure 12 is an explanatory diagram showing the frame structure of the vehicle body 11, and shows the state with the left running unit UL (left side frame 21L) removed. The central unit UC has a central frame 20 and a case 205. The case 205 houses the first battery 16A and the cooling unit 23. In Figure 12, the case 205 and one of the mounted devices, the hydraulic unit 17 (part thereof), are shown by dashed lines.

[0081] The central frame 20 has four front and rear frame members 61 located at four points (top, bottom, left, and right) and are long in the front-to-back direction. The central frame 20 has multiple upper and lower frame members 62 that are long in the vertical direction, connecting the upper front and rear frame members 61 and the lower front and rear frame members 61. The central frame 20 has multiple left and right frame members 63 that are long in the left-to-right direction, connecting the left front and rear frame member 61 and the right front and rear frame member 61. These front and rear frame members 61, upper and lower frame members 62, and left and right frame members 63 give the central frame 20 a rectangular parallelepiped shape that is long in the front-to-back direction.

[0082] The central frame 20 has two rails 51 that are long in the front-rear direction and one front-rear actuator 133. The central frame 20 has a lower frame 207 that supports the case 205 from below and is fixed to the case 205. The rails 51, the front-rear actuator 133, and the lower frame 207 constitute a moving mechanism for moving the mounted equipment (first mounted equipment), including the case 205 (first battery 16A), within the vehicle body 11. The front-rear actuator 133 is a hydraulic cylinder. Note that the moving mechanism may have a different configuration; for example, the front-rear actuator 133 may be electrically powered.

[0083] The two rails 51 are located at the front of the central frame 20, extending from the front to the center in the front-to-back direction, and are long in the front-to-back direction. The two rails 51 are parallel to each other and mounted on the front and rear frame members 61. The rails 51 support the lower frame 207 on which the case 205 is mounted, allowing it to move in the front-to-back direction. The rails 51 have a cylindrical shape. The lower frame 207 has a plurality of sliding members 206 attached to its lower part. Two sliding members 206 are provided separated in the left-right direction, and when these two sliding members 206 are considered as a pair, multiple pairs of sliding members 206 are provided spaced apart in the front-rear direction. The sliding members 206 have a shape that fits around the rail 51, which has a circular cross-section, and the lower frame 207 and case 205 are configured to be less likely to fall off the rail 51.

[0084] The front and rear actuators 133 move the case 205 along the rails 51. The front and rear actuators 133 are cylinders that extend and retract by hydraulic pressure supplied from the hydraulic unit 17 and are located between the two lower front and rear frame members 61. One end of the front and rear actuator 133 is attached to an auxiliary frame member (not shown) connected to two front and rear frame members 61 located at the bottom. The other end of the front and rear actuator 133 is attached to a bracket provided on the lower surface of the case 205 or the lower frame 207.

[0085] As the front and rear actuators 133 extend and retract, the case 205, which rests on the lower frame 207, moves back and forth within the central frame 20. For example, the front and rear actuators 133 change the front-to-rear position of the case 205 according to the shape of the road surface on which the work vehicle 10 is traveling. The position of the heavy first battery 16A changes, making it possible to adjust the vehicle's balance.

[0086] As described above (see Figure 10), the case 205 houses the cooling unit 23 (first cooling unit 231 and second cooling unit 232) together with the first battery 16A. The work vehicle 10 has piping 65 that extends from the water-cooled second cooling unit 232 to the rear mounted equipment such as the hydraulic unit 17. Figure 13 is an explanatory diagram of the linear configuration of the piping 65. Figure 13 is a diagram from Figure 12 with the frame structure of the vehicle body 11 omitted for the purpose of explaining the piping 65. As shown in Figures 12 and 13, the piping 65 has a movable pipe 66 that moves in the longitudinal direction together with the case 205, and a flexible pipe 67 that is connected to the movable pipe 66 and bends as the case 205 moves. In Figure 12, for explanatory purposes, the movable pipe 66 is shown with a dashed line, and the flexible pipe 67 is shown with a dotted line.

[0087] When the case 205 moves in the front-to-back direction, the movable piping 66 moves with the case 205 in the front-to-back direction. When the case 205 moves in the front-to-back direction, the distance between the cooling unit 23 housed in the case 205, the movable piping 66 connected to the case 205, and the mounted equipment to be cooled (such as the hydraulic unit 17) changes. Even in this case, since the piping 65 includes a flexible tube 67, and the flexible tube 67 is deformable, the change in distance is absorbed. To assist in the movement of the movable pipe 66 and the deformation of the flexible pipe 67, the work vehicle 10 has an auxiliary section 60 for the pipe 65. Its configuration will be described below.

[0088] [Piping 65, and auxiliary parts 60] In Figure 13, the piping 65 connects the first mounted equipment and the second mounted equipment, which are mounted on the central unit UC of the vehicle body 11. The first mounted equipment includes the cooling unit 23 mounted on the central unit UC. More specifically, the water-cooled second cooling unit 232 of the cooling unit 23 is housed in a case 205. The piping 65 is connected to the second cooling unit 232 at the bottom of the case 205. Therefore, the case 205 is also included in the first mounted equipment. As mentioned above, the case 205 also houses the first battery 16A, and the first battery 16A, the cooling unit 23, and the case 205 are movable together in the front-rear direction.

[0089] The second mounted device is a device different from the first mounted device, and in this embodiment, it is a hydraulic unit 17 mounted on the central unit UC. As described above (see Figure 12), the vehicle body 11 has two rails 51 mounted on the central frame 20 and one front / rear actuator 133 as a movement mechanism for moving the first mounted equipment (case 205, etc.) back and forth within the vehicle body 11.

[0090] The auxiliary section 60 for the piping 65 assists in the movement of the piping 65 when the case 205 (first mounted equipment) is moved. The specific configuration of the piping 65 and the auxiliary section 60 will be described below.

[0091] As shown in Figure 13, the piping 65 includes movable piping 66 that can move back and forth together with the case 205 (first mounted equipment). The movable piping 66 is a non-flexible pipe that is difficult to deform, and in this embodiment, it is a metal pipe connected to the case 205. The movable piping 66 includes two movable pipes 66A and 66B that are long in the front-to-back direction. Two movable pipes 66A and 66B are connected to the case 205. One of the first movable pipes 66A is a pipe for discharging coolant from the water-cooled second cooling unit 232 (case 205). The other, the second movable pipe 66B is a pipe for supplying coolant used to cool the second mounted equipment, the hydraulic unit 17, to the second cooling unit 232.

[0092] The piping 65 includes two deformable flexible pipes 67A and 67B. The flexible pipes 67A and 67B are made of resin and have, for example, a bellows shape. The flexible pipes 67A and 67B are flexible and elastically deformable. The flexible pipes 67A and 67B are connected to the movable pipes 66A and 66B via joints 69. Each of the flexible pipes 67A and 67B has a loop piping section 68. The loop piping section 68 is curved in a U-shape, and as the case 205 moves in the front-rear direction, it elastically deforms and changes its curved shape.

[0093] Thus, the piping 65 includes a first movable pipe 66A connected to a part 205A of the case 205, a second movable pipe 66B connected to another part 205B of the case 205, a first flexible pipe 67A, and a second flexible pipe 67B. The motor 171 and inverter 172 of the hydraulic unit 17 (second mounted equipment) to be cooled each have a passage through which coolant flows. A first relay pipe 64A for inflow and a second relay pipe 64B for outflow are connected to these passages. The first flexible pipe 67A connects the first movable pipe 66A, located below the first battery 16A, to the first intermediate pipe 64A, which is the piping on the hydraulic unit 17 side. The second flexible pipe 67B connects the second intermediate pipe 64B, which is the piping on the hydraulic unit 17 side, to the second movable pipe 66B, located below the first battery 16A.

[0094] The first pipe unit UP1 is formed by the first movable pipe 66A and the first flexible pipe 67A, and the first pipe unit UP2 is formed by the second flexible pipe 67B and the second movable pipe 66B. The first pipe unit UP1 is a piping unit for discharging coolant from the second cooling unit 232 (case 205), and the second pipe unit UP2 is a piping unit for supplying coolant used to cool the second mounted equipment, the hydraulic unit 17, to the second cooling unit 232. The first pipe unit UP1, which includes the first movable pipe 66A and the first flexible pipe 67A, and the second pipe unit UP2, which includes the second flexible pipe 67B and the second movable pipe 66B, have a two-tiered structure in a part of them (the rear of the vehicle). That is, the first flexible pipe 67A is located below, and the second flexible pipe 67B is located above the first flexible pipe 67A, thus having a two-tiered structure. The piping 65 for cooling the motor 171 and other components of the hydraulic unit 17, which is the second mounted equipment located at the rear of the vehicle, has a two-tiered structure at the rear and lower part of the vehicle, thereby reducing the piping space.

[0095] An auxiliary section 60 for such piping 65 will be described. In this embodiment, the auxiliary section 60 includes multiple types of members. The auxiliary section 60 includes a support member 58 for the first movable pipe 66A and the second movable member 66B, and a guide member 59 for the flexible pipes 67A and 67B.

[0096] Figure 14 is an explanatory diagram of the support member 58. The support member 58 has a mounting portion 581 and a support body 582. The mounting portion 581 is attached to a part of a non-movable member included in the vehicle body 11. In the central frame 20 (see Figure 12), the case 205 moves, while the non-moving members do not. The non-moving members are members included in the central frame 20, and specifically, for example, the central frame 20 and the beam members included in the central frame 20. The beam members may be the front and rear frame members 61, the upper and lower frame members 62, or the left and right frame members 63 that constitute the central frame 20, or they may be members attached to these frame members 61, 62, and 63.

[0097] The mounting portion 581 is attached to the beam member 585 (see Figure 14) as described above. The support body 582 shown in Figure 14 has a roller 583 that supports the movable pipe 66 from below. As the roller 583 rotates, the movable pipe 66 becomes freely movable in the front-rear direction. In this manner, the support member 58 supports the movable pipes 66 (first movable pipe 66A and second movable pipe 66B), which are non-flexible pipes (metal pipes), in a suspended state, allowing them to be displaced in the front-rear direction, which is the direction of movement of the case 205.

[0098] As shown in Figure 13, a plurality of support members 58 supporting the first movable pipe 66A are arranged in a line with spacing in the front-rear direction, and a plurality of support members 58 supporting the second movable pipe 66B are arranged in a line with spacing in the front-rear direction. The piping 65 includes non-flexible movable piping 66 (first movable piping 66A and second movable piping 66B), and even if the movable piping 66 moves together with the case 205, the support member 58 can support the movable piping 66 without hindering its movement.

[0099] Figure 15 is an explanatory diagram showing the first flexible pipe 67A and the second flexible pipe 67B, which have a two-tiered structure, as viewed from the rear. The guide member 59 is attached to the first flexible pipe 67A and the second flexible pipe 67B, respectively. The guide member 59 is attached to the loop piping section 68. Figure 16 is an explanatory diagram of the guide section 59. The guide section 59 has a fixing band 591 that is fixed to the flexible pipe 67A (67B) and a roller 592 that is attached to the fixing band 591.

[0100] The roller 592 rolls and makes contact with the non-moving members included in the vehicle body 11. In the central frame 20, the case 205 moves, while the non-moving members do not. The non-moving members are members included in the central frame 20, and to be more specific (see Figure 15), they are the front and rear frame members 61 located at the bottom of the central frame 20, or the floor members 611 attached to the front and rear frame members 61. In this embodiment, the rolling contact refers to the state in which a part of the guide portion 59 (roller 592) rolls while in contact with the non-moving members.

[0101] The guide member 59 (roller 592) rolls and contacts the front and rear frame members 61 or floor members 611, which are non-moving members of the vehicle body 11. Alternatively, the roller 59 may slide into contact with a non-moving member included in the vehicle body 11. The guide member 59 may also have a sliding member instead of a rotating roller 592, in which case the sliding member slides into contact with the non-moving member of the vehicle body 11. In this embodiment, sliding contact refers to a state in which a part of the guide portion 59 (roller 592) or the sliding member makes contact with the non-moving member while causing sliding.

[0102] Thus, the piping 65 includes flexible pipes 67A and 67B, which deform as the case 205 moves. Even in this case, the guide member 59 does not allow the flexible pipes 67A and 67B to come into direct contact with the non-moving members (front and rear frame members 61 or floor members 611), but rather the guide member 59 comes into contact (rolling contact) with the non-moving members.

[0103] As described above, the vehicle body 11 of this embodiment (see Figure 12) has a central frame 20 which is part of the vehicle frame that forms the skeleton of the vehicle body, and a case 205 which houses the first battery 16A and the cooling unit 23. The cooling unit 23, including its case 205, is the first mounted equipment that moves in the longitudinal direction relative to the central frame 20 (vehicle frame). The piping 65 is provided between the cooling unit 23 and the second mounted equipment (hydraulic unit 17) that is to be cooled.

[0104] As shown in Figure 13, the work vehicle 10 has a support member 58 and a guide member 59 as auxiliary parts 60 that assist in the movement of the piping 65 accompanying the movement of the case 205, which is the first mounted equipment, in the front-rear direction. In the central unit UC, when the case 205, which is the first mounted equipment, moves, the piping 65 between it and the hydraulic unit 17, which is the second mounted equipment, moves or flexes in part. Even in this case, the auxiliary parts 60 (support members 58, guide members 59) prevent the piping 65 from directly contacting the non-moving members (non-moving front and rear frame members 61 or floor members 611) included in the vehicle body 11.

[0105] Therefore, it is possible to prevent the moving or bending parts of the piping 65 from coming into contact with non-moving members, causing wear and tear from friction, coming loose at the joint 69, or hindering the movement of the case 205.

[0106] The auxiliary part 60 may include a sliding plate 98 (see Figure 17). The sliding plate 98 is, for example, a plate-shaped, self-lubricating slide plate. As shown in Figures 13 and 17, when the portion of the flexible pipe 67 that extends in the front-rear direction passes over the left and right frame members 63 of the central frame 20, the sliding plate 98 is mounted on the left and right frame members 63. As a result, even if the flexible pipe 67 slackens and approaches the left and right frame members 63, the flexible pipe 67 will contact the sliding plate 98, allowing for smooth deformation and displacement of the flexible pipe 67. The sliding plate 98 prevents the piping 65 from coming loose at the joint 69 or hindering the movement of the case 205 by preventing the flexible pipe 67 from contacting the left and right frame members 63.

[0107] In the above explanation, we have described the piping 65 connecting the first mounted equipment and the second mounted equipment. However, a similar configuration may be adopted for the wiring connecting the first mounted equipment and the second mounted equipment, in addition to the piping 65. In this case, the wiring may be housed and routed in a pipe equivalent to the piping 65. Alternatively, the wiring connecting the first mounted equipment and the second mounted equipment may be supported by a different configuration. For example, a cable carrier such as Cablebear (registered trademark) may be used to support a portion of the wiring.

[0108] 〔others〕 The embodiments described above are illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims rather than by the embodiments, and includes all modifications within the scope equivalent to the configurations described in the claims. [Explanation of Symbols]

[0109] 10 Work Vehicles 11. Vehicle body 12. Traveling device 16A Daiichi Battery (Battery) 17 Hydraulic Unit 20 Central Frame 23 Cooling Unit 25 wheels (front wheels, rear wheels) 51 rails 57. Air-cooled heat exchanger (evaporator) 58 Support member 59 Guide member 60 Auxiliary part 65 Piping 66 Mobile piping (non-flexible pipe, metal pipe) 66A, 66B Movable piping (non-flexible pipe, metal pipe) 67 Flexible tube 67A,67B Flexible tube 68 Loop piping section 133 Front and rear actuators (actuators) 205 cases 231 First Cooling Unit (Air Cooling Unit) 232 Second cooling unit (water cooling unit) 592 Laura UC Central Unit UL Left-hand drive unit UR Right-hand drive unit UP1 First Pipe Unit UP2 Second Pipe Unit PC center in the front-to-back direction

Claims

1. The central unit, A left-hand drive unit is provided to the left of the central unit and supports the front and rear wheels, A right-hand drive unit is provided to the right of the central unit and supports the front and rear wheels, A battery mounted on the central unit and located between the left and right drive units, In order to cool the mounted equipment installed on the central unit, the left travel unit, or the right travel unit, a cooling unit is mounted on the central unit, It has, The cooling unit and the battery are arranged front to back between the left drive unit and the right drive unit. With respect to the center of the central unit in the longitudinal direction, the cooling unit is located further outward in the longitudinal direction of the vehicle than the battery. Work vehicle.

2. The battery is located behind the cooling unit. The work vehicle according to claim 1.

3. The mounted equipment to be cooled by the cooling unit includes the battery, The cooling unit and the battery are arranged in a front-to-back configuration. A work vehicle according to claim 1 or claim 2.

4. It has a common case that houses the battery and the cooling unit. A work vehicle according to claim 1 or claim 2.

5. The cooling unit comprises an air cooling unit for cooling a first mounted device among the plurality of mounted devices, and a water cooling unit for cooling a second mounted device among the plurality of mounted devices. A work vehicle according to claim 1 or claim 2.

6. The air-cooling unit has an air-cooled heat exchanger that cools a refrigerant to cool the battery, The air-cooling unit and the battery are arranged side by side, front to back. The work vehicle according to claim 5.

7. The water cooling unit is located below the air cooling unit. The work vehicle according to claim 5.

8. It has piping extending from the water cooling unit through which coolant flows, The piping passes below the battery and connects to a cooling channel of the mounted equipment located on the opposite side of the water cooling unit and behind the battery. The work vehicle according to claim 7.

9. It has a hydraulic unit located on the opposite side of the cooling unit and rearward from the battery, The aforementioned mounted equipment is equipment included in the hydraulic unit. A work vehicle according to claim 1 or claim 2.

10. The central unit comprises a central frame and a case for housing the battery. The aforementioned central frame is A rail that supports the aforementioned case so that it can move in the front-to-back direction, The case has an actuator that moves the case along the rail, A work vehicle according to claim 1 or claim 2.

11. The case houses the cooling unit together with the battery. The piping extending from the cooling unit to the mounted equipment at the rear is A movable pipe that moves in the front-rear direction together with the case, It has a flexible pipe connected to the aforementioned movable piping that bends as the case moves, The work vehicle according to claim 10.

12. The left travel unit and the right travel unit, or one or both of them, and the central unit are relatively displaceable. The central unit and the travel unit are provided with a displacement actuator that allows them to be displaced relative to each other. A work vehicle according to claim 1 or claim 2.

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