Work vehicle

Abstract

To provide an inverter compactly in a work vehicle.SOLUTION: A work vehicle includes: travel devices 1, 2; a battery 25; a motor 26 configured to supply power to the travel devices 1, 2; an inverter 24 configured to operate the motor 26; and an operation section 5. The battery 25 is provided forward of the operation section 5, and the inverter 24 is provided between the battery 25 and the operation section 5 in a side view.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electric work vehicle in which a traveling device is driven by a motor, and a hybrid work vehicle in which a traveling device is driven by an engine and a motor. [Background technology]

[0002] An example of an electric work vehicle is disclosed in Patent Document 1. In Patent Document 1, a transmission case that houses a transmission for traveling is provided at the rear of the work vehicle, and a motor is connected to the front of the transmission case. A battery is provided at the front of the work vehicle, in a position slightly higher than the front wheels (corresponding to the traveling device). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-141875 Summary of the Invention [Problem to be solved by the invention]

[0004] When a work vehicle is provided with an inverter for operating a motor, it is desired that the inverter be provided in a compact manner on the work vehicle. An object of the present invention is to provide a construction in which an inverter can be installed in a compact manner in a work vehicle. [Means for solving the problem]

[0005] The work vehicle of the present invention is equipped with a traveling device, a battery, a motor that supplies power to the traveling device, an inverter that operates the motor, and a driving unit, the battery being provided forward of the driving unit, and the inverter being provided between the battery and the driving unit when viewed from the side.

[0006] According to the present invention, when the battery is provided in front of the driving unit, the inverter is provided between the battery and the driving unit, and the battery and inverter are provided side by side in the front and rear, so that the inverter can be provided compactly on the work vehicle. According to the present invention, the inverter is provided near the battery, and the harness between the inverter and the battery can be configured to be short, thereby simplifying the harness between the inverter and the battery.

[0007] In the present invention, it is preferable that a steering handle for operating the traveling device is provided in front of the driving section, a steering shaft for operating the traveling device extends downward from the steering handle, and the inverter is provided between the battery and the steering shaft in a side view.

[0008] In many work vehicles, a steering handle is provided in front of the driver's section, a steering shaft extends downward from the steering handle, and the steering handle is used to steer the traveling devices such as the front wheels.

[0009] According to the present invention, the control handle and steering shaft are provided rearward of the battery, and the inverter is provided between the battery and the steering shaft, which makes effective use of the space between the battery and the steering shaft and allows the inverter to be provided compactly on the work vehicle.

[0010] In the present invention, it is preferable that the inverter is provided along the vertical direction in a side view and along the horizontal direction in a plan view.

[0011] Inverters are often configured by housing various devices in a cubic case. According to the present invention, the inverter is arranged along the vertical direction when viewed from the side and along the horizontal direction when viewed from the top, so that the inverter can be arranged along the rear of the battery, which is advantageous in that the inverter can be arranged close to the rear of the battery and can be arranged compactly on the work vehicle.

[0012] In the present invention, a pillar frame is provided having a right portion along the vertical direction, a left portion along the vertical direction, and an upper portion spanning the upper part of the right portion and the upper part of the left portion, and it is preferable that the pillar frame is arranged between the battery and the driving unit in a side view, and the inverter is arranged between the right portion and the left portion and below the upper portion in a front view. In addition, the work vehicle of the present invention is equipped with a traveling device, a battery, a motor that supplies power to the traveling device, an inverter that operates the motor, and a driving unit, and is equipped with a pillar frame having a right portion that runs along the vertical direction, a left portion that runs along the vertical direction, and an upper portion that spans the upper part of the right portion and the upper part of the left portion, the battery is provided forward of the driving unit, the inverter is provided between the battery and the driving unit in a side view, the inverter is provided along the vertical direction in a side view and along the left-right direction in a plan view, the pillar frame is provided between the battery and the driving unit in a side view, and the inverter is provided between the right portion and the left portion and below the upper portion in a front view.

[0013] In a work vehicle, a pillar frame may be provided in front of the driver's section, and a cover such as a hood at the front of the work vehicle, a steering handle, etc. may be supported by the pillar frame. The pillar frame may be configured to have a right portion along the vertical direction, a left portion along the vertical direction, and an upper portion spanning the upper part of the right portion and the upper part of the left portion.

[0014] According to the present invention, when the pillar frame is provided between the battery and the driving section, the inverter is provided below the upper part of the pillar frame between the right and left parts of the pillar frame, and the inverter is provided inside the pillar frame. This allows the inverter to be provided by effectively utilizing the area inside the pillar frame, which is advantageous in that the inverter can be provided compactly on the work vehicle.

[0015] In the present invention, it is preferable that the motor is provided below the inverter.

[0016] According to the present invention, the motor is provided near the inverter, and the harness between the inverter and the motor can be configured to be short, thereby simplifying the harness between the inverter and the motor. According to the present invention, the motor is provided below the inverter at a relatively low position, which allows the center of gravity of the work vehicle to be lowered, thereby improving the running stability of the work vehicle.

[0017] The work vehicle of the present invention is equipped with a traveling device, a battery, a motor that supplies power to the traveling device, an inverter that operates the motor, and a driving unit, wherein the battery is provided forward of the driving unit and the inverter is provided forward of the battery.

[0018] According to the present invention, when the battery is provided in front of the driving section, the inverter is provided in front of the battery, and the battery and inverter are provided side by side in the front and rear, so that the inverter can be provided compactly on the work vehicle. According to the present invention, the inverter is provided near the battery, and the harness between the inverter and the battery can be configured to be short, thereby simplifying the harness between the inverter and the battery. According to the present invention, the inverter is more easily exposed to outside air when the work vehicle is moving forward, which is advantageous in terms of cooling the inverter.

[0019] In the present invention, it is preferable that the inverter is provided along the vertical direction in a side view and along the horizontal direction in a plan view.

[0020] Inverters are often configured by housing various devices in a cubic case. According to the present invention, the inverter is arranged along the vertical direction when viewed from the side and along the horizontal direction when viewed from the top, so that the inverter can be arranged along the front of the battery, which is advantageous in that the inverter can be arranged close to the front of the battery and can be arranged compactly on the work vehicle.

[0021] The work vehicle of the present invention is equipped with a running device, a battery, a motor, an inverter that operates the motor, a driving section, and a transmission case that houses a transmission for running, and the power of the motor is transmitted to the transmission and from the transmission to the running device, the transmission case is provided below the driver's seat of the driving section, and the inverter is provided between the driver's seat and the transmission case in a side view.

[0022] In a work vehicle, if the transmission case is located below the driver's seat in the driver's section, a relatively large space is likely to be created between the driver's seat and the transmission case. According to the present invention, by installing the inverter between the driver's seat and the transmission case, the space between the driver's seat and the transmission case can be effectively utilized to install the inverter, so that the inverter can be installed compactly in the work vehicle. According to the present invention, work on the inverter can be easily performed by removing the driver's seat, etc., and therefore, the maintainability of the inverter can be improved.

[0023] In the present invention, it is preferable that the inverter is provided along the horizontal direction.

[0024] Inverters are often configured by housing various devices in a cubic case. According to the present invention, the inverter is arranged horizontally, so that the inverter can be easily arranged between the driver's seat and the transmission case, which is advantageous in that the inverter can be arranged compactly in the work vehicle.

[0025] In the present invention, it is preferable that the motor be provided between the driver's seat and the transmission case in a side view.

[0026] According to the present invention, the motor is positioned relatively far rearward from the front-to-rear center of the work vehicle, which makes it easier for the motor to function as a balance weight when a relatively heavy working implement is supported at the front of the work vehicle, thereby improving the front-to-rear balance of the work vehicle when traveling for work with a relatively heavy working implement supported at the front of the work vehicle.

[0027] According to the present invention, the motor can be installed relatively easily by effectively utilizing the space between the driver's seat and the transmission case, and the motor support structure can be configured relatively easily, thereby simplifying the motor support structure.

[0028] According to the present invention, the motor is provided near the inverter, and the harness between the inverter and the motor can be configured to be short, thereby simplifying the harness between the inverter and the motor. According to the present invention, work on the motor can be easily performed by removing the driver's seat, etc., and therefore the maintainability of the motor can be improved.

[0029] In the present invention, it is preferable that a transmission case is provided that houses a transmission for traveling, the power of the motor is transmitted to the transmission and from the transmission to the traveling device, the transmission case is provided below the driver's seat of the driver's section, a link mechanism to which a working device is connected is provided on the transmission case so as to be able to be raised and lowered, a hydraulic cylinder that raises and lowers the link mechanism and a hydraulic pump that supplies hydraulic oil to the hydraulic cylinder are provided on the transmission case, and a pump motor that drives the hydraulic pump is provided between the driver's seat and the transmission case in a side view. The work vehicle of the present invention is also provided with a traveling device, a battery, a motor that supplies power to the traveling device, an inverter that operates the motor, a driving section, and a transmission case that houses a transmission for traveling, the battery is provided forward of the driving section, the inverter is provided between the battery and the driving section in a side view, power from the motor is transmitted to the transmission and from the transmission to the traveling device, the transmission case is provided below the driver's seat of the driver's section, a link mechanism to which a work device is connected is provided in the transmission case so as to be able to be raised and lowered, a hydraulic cylinder that raises and lowers the link mechanism and a hydraulic pump that supplies hydraulic oil to the hydraulic cylinder are provided in the transmission case, and a pump motor that drives the hydraulic pump is provided between the driver's seat and the transmission case in a side view. The work vehicle of the present invention is also provided with a traveling device, a battery, a motor that supplies power to the traveling device, an inverter that operates the motor, a driving section, and a transmission case that houses a transmission for traveling, wherein the battery is provided forward of the driving section, the inverter is provided forward of the battery, power from the motor is transmitted to the transmission and from the transmission to the traveling device, the transmission case is provided below the driver's seat of the driving section, a link mechanism to which a work device is connected is provided on the transmission case so that it can be raised and lowered, a hydraulic cylinder that raises and lowers the link mechanism and a hydraulic pump that supplies hydraulic oil to the hydraulic cylinder are provided on the transmission case, and a pump motor that drives the hydraulic pump is provided between the driver's seat and the transmission case in a side view. The work vehicle of the present invention is also provided with a traveling device, a battery, a motor, an inverter that operates the motor, a driving section, and a transmission case that houses a transmission for traveling, wherein power from the motor is transmitted to the transmission and from the transmission to the traveling device, the transmission case is provided below the driver's seat in the driving section, the inverter is provided between the driver's seat and the transmission case in a side view, a link mechanism to which a work device is connected is provided on the transmission case so as to be able to be raised and lowered, a hydraulic cylinder that raises and lowers the link mechanism and a hydraulic pump that supplies hydraulic oil to the hydraulic cylinder are provided on the transmission case, and a pump motor that drives the hydraulic pump is provided between the driver's seat and the transmission case in a side view.

[0030] In a work vehicle, a link mechanism is mounted on a transmission case so as to be movable up and down, and a hydraulic cylinder that moves the link mechanism up and down and a hydraulic pump that supplies hydraulic oil to the hydraulic cylinder are also mounted on the transmission case. This allows the working equipment to be connected to the link mechanism and moved up and down by the hydraulic cylinder. The hydraulic cylinder and hydraulic pump are provided in the transmission case so that the lubricating oil stored in the transmission case is supplied to the hydraulic pump as hydraulic oil, and then supplied from the hydraulic pump to the hydraulic cylinder, and the hydraulic oil from the hydraulic cylinder is returned to the transmission case.

[0031] In a work vehicle, if the transmission case is located below the driver's seat in the driver's section, a relatively large space is likely to be created between the driver's seat and the transmission case. According to the present invention, when a pump motor is provided to drive a hydraulic pump, the pump motor can be provided relatively easily by effectively utilizing the space between the driver's seat and the transmission case, and the support structure for the pump motor can be configured relatively easily, thereby simplifying the support structure for the pump motor.

[0032] According to the present invention, the pump motor is provided between the driver's seat and the transmission case, so that the pump motor is provided close to the hydraulic pump, thereby simplifying the drive structure of the hydraulic pump by the pump motor. According to the present invention, work on the pump motor can be easily performed by removing the driver's seat, etc., and therefore the maintainability of the pump motor can be improved. [Brief explanation of the drawings]

[0033] [Figure 1] FIG. 2 is a left side view of the tractor. [Figure 2] FIG. 2 is a longitudinal sectional front view of the vicinity of the inverter and the motor. [Figure 3] FIG. 2 is a schematic diagram showing a transmission system from a motor to the front and rear wheels. [Figure 4] FIG. 10 is a left side view of a tractor according to a second alternative embodiment of the invention. [Figure 5] FIG. 10 is a left side view of a tractor according to a third alternative embodiment of the invention. [Figure 6] FIG. 10 is a left side view of a tractor according to a fourth alternative embodiment of the invention. [Figure 7] FIG. 10 is a left side view of a tractor according to a fifth alternative embodiment of the invention. [Figure 8] FIG. 13 is a left side view of a tractor according to a seventh modified embodiment of the invention. DETAILED DESCRIPTION OF THE INVENTION

[0034] Figures 1 to 8 show an electric tractor, which is an example of a work vehicle, and in Figures 1 to 8, F indicates the forward direction, B indicates the backward direction, U indicates the upward direction, D indicates the downward direction, R indicates the right direction, and L indicates the left direction.

[0035] (Overall configuration of the tractor) As shown in Figure 1, a vehicle body 3 is supported by right and left front wheels 1 (corresponding to the front running gear) and right and left rear wheels 2 (corresponding to the rear running gear). A hood 4 is provided at the front of the vehicle body 3, and a driver's section 5 is provided at the rear of the vehicle body 3. The driver's section 5 is provided with a steering wheel 6 for steering the front wheels 1, a driver's seat 7, a floor 8, and a rope frame 9.

[0036] The machine body 3 is composed of right and left machine body frames 10, a transmission case 11, etc. The transmission case 11 is composed of a front case 12 and a rear case 13 connected together. The right and left machine body frames 10 are connected to the transmission case 11 and are arranged in the front-to-rear direction below the driver's section 5 (floor 8). The transmission case 11 is provided below the driver's seat 7 of the driver's section 5.

[0037] A front axle case 14 is supported on the front of the vehicle frame 10, and right and left front wheels 1 are supported on the front axle case 14. Right and left rear wheels 2 are supported on the transmission case 11 (rear case 13).

[0038] A top link 15 (corresponding to a link mechanism) and right and left lower links 16 (corresponding to link mechanisms) are mounted at the rear of the transmission case 11 (rear case 13) so as to be able to swing up and down, and a work device (not shown) such as a rotary tiller can be connected to the top link 15 and lower links 16.

[0039] Right and left lift arms 17 are provided at the rear of the transmission case 11 (rear case 13), and a linking rod 18 is connected between the lift arms 17 and the lower link 16. When the lift arms 17 are swung up and down, the top link 15 and the lower link 16 are raised and lowered, and the working device is raised and lowered.

[0040] (Front configuration of the aircraft) 1 and 2, pillar frames 19 are provided between the front wheels 1 and the driver's section 5 (rear wheels 2) on the vehicle frame 10. The pillar frames 19 are formed by bending a plate material, and have a right portion 19a, a left portion 19b, an upper portion 19c, and a rear portion 19d.

[0041] The rear portion 19d of the pillar frame 19 is flat and extends in the up-down and left-right directions. The right portion 19a of the pillar frame 19 is formed by bending the right part of the rear portion 19d of the pillar frame 19 forward, and extends in the up-down and front-rear directions. The left portion 19b of the pillar frame 19 is formed by bending the left part of the rear portion 19d of the pillar frame 19 forward, and extends in the up-down and front-rear directions.

[0042] The upper portion 19c of the pillar frame 19 is formed by bending an upper portion of a rear portion 19d of the pillar frame 19 forward, and extends along the left-right and front-rear directions. The upper portion 19c of the pillar frame 19 spans the upper portion of the right portion 19a and the upper portion of the left portion 19b of the pillar frame 19.

[0043] As shown in FIG. 1, the hood 4 is supported so as to be able to open and close around a fulcrum along the left-right direction of the upper portion 19c of the pillar frame 19, and can be operated to a closed position shown in FIG. 1 and an open position above the closed position.

[0044] A power steering mechanism 20 is provided at the lower rear surface of the rear portion 19d of the pillar frame 19. A handle post 21 is attached to the power steering mechanism 20 and extends upward from the power steering mechanism 20. The steering handle 6 is supported on the upper part of the handle post 21, and a steering shaft 22 is connected between the steering handle 6 and the power steering mechanism 20.

[0045] When the steering wheel 6 is rotated, the rotation of the steering wheel 6 is transmitted to the power steering mechanism 20 via the steering shaft 22, and the power steering mechanism 20 steers the front wheels 1 to the left and right.

[0046] With the above configuration, as shown in Figure 1, a steering handle 6 for operating the front wheels 1 (front running gear) is provided in front of the driver's section 5, and a steering shaft 22 for operating the front wheels 1 (front running gear) extends downward from the steering handle 6.

[0047] (Battery and inverter configuration) As shown in Figures 1 and 2, support bases 23 are attached to the upper front portions of the right and left vehicle frames 10. An inverter 24 is provided, and the inverter 24 is configured by accommodating various devices in a cubic case with a small width (front-to-back width).

[0048] The inverter 24 is arranged along the vertical direction when viewed from the side and along the horizontal direction when viewed from the front, and is attached to the rear of the support base 23 so as to contact the front portion of the rear part 19d of the pillar frame 19.

[0049] As shown in Fig. 1, a battery 25 is provided, and the battery 25 is configured by housing a plurality of stacks (not shown) in a cubic case, each stack being formed by connecting a plurality of battery modules (not shown). The battery 25 is attached to a support base 23, and the inverter 24 and the battery 25 are covered by the hood 4 in the closed position. By opening the hood 4, maintenance work on the inverter 24 and the battery 25 can be performed.

[0050] 1 and 2, with the above configuration, the inverter 24 is provided between the right portion 19a and the left portion 19b of the pillar frame 19 in a front view, and overlaps with the right portion 19a and the left portion 19b of the pillar frame 19 in a side view. The inverter 24 is provided below the upper portion 19c of the pillar frame 19 in a front view, and overlaps with the upper portion 19c of the pillar frame 19 in a plan view.

[0051] The battery 25 is provided in front of the driving section 5, and the inverter 24 is provided between the battery 25 and the driving section 5 in a side view. The inverter 24 is provided between the battery 25 and the steering shaft 22 in a side view. The pillar frame 19 is provided between the battery 25 and the driving section 5 in a side view, and the inverter 24 is provided between the battery 25 and a rear portion 19d of the pillar frame 19 in a side view.

[0052] (Motor configuration) As shown in Figures 1 and 2, right and left mounting brackets 27 are connected to the inner surfaces of the right and left body frames 10, and the right and left parts of the motor 26 are connected to the right and left mounting brackets 27.

[0053] In the inverter 24, the DC power of the battery 25 is converted into AC power and supplied to the motor 26, thereby operating the motor 26. The power of the motor 26 is supplied to the front wheels 1 and the rear wheels 2, as shown in FIG.

[0054] With the above configuration, as shown in Figures 1 and 2, the motor 26 is provided between the front wheel 1 (front traveling device) and the rear wheel 2 (rear traveling device) and below the steering handle 6 in side view. A right body frame 10 and a left body frame 10 are arranged in the fore-and-aft direction below the driver's section 5 (floor 8), and a motor 26 is provided between the right body frame 10 and the left body frame 10 in a plan view (front view).

[0055] In a side view, the motor 26 is provided below the pillar frame 19, below the power steering mechanism 20, below the inverter 24, and below the rear part of the battery 25. In a side view, the pillar frame 19, the power steering mechanism 20, and the inverter 24 are provided above the motor 26.

[0056] (Configuration of transmission system to front and rear wheels) 1 and 3, a hydrostatic continuously variable transmission 28 (corresponding to a transmission for traveling) is housed inside the front case 12 of the transmission case 11, and power from the motor 26 is transmitted to the continuously variable transmission 28 via a transmission shaft 29. The continuously variable transmission 28 is capable of continuously changing speeds between the forward and reverse sides, and is operated by a speed change pedal (not shown) provided on the floor 8 of the driver's section 5.

[0057] An auxiliary transmission 30 (corresponding to a transmission for traveling), a rear wheel differential 31, and a front wheel transmission 32 (corresponding to a transmission for traveling) are housed inside the rear case 13 of the transmission case 11. Power that has been speed-changed by the continuously variable transmission 28 is transmitted to the auxiliary transmission 30, and then transmitted from the auxiliary transmission 30 to the rear wheels 2 via the rear wheel differential 31.

[0058] The power branched off between the sub-transmission 30 and the rear wheel differential device 31 is transmitted to the front wheel transmission 32, and from the front wheel transmission 32 via a transmission shaft 33 to the front wheel differential device 34 housed inside the front axle case 14, and from the front wheel differential device 34 to the front wheels 1.

[0059] When the front wheel 1 is steered to the right or left within a set angle range from the straight ahead position, the front wheel transmission 32 drives the front wheel 1 and the rear wheel 2 at the same speed. When the front wheel 1 is steered to the right or left beyond the set angle range, the front wheel transmission 32 drives the front wheel 1 at a higher speed than the rear wheel 2.

[0060] With the above configuration, as shown in FIG. 3, a transmission case 11 (front case 12 and rear case 13) is provided that houses a continuously variable transmission 28 (traveling transmission), an auxiliary transmission 30 (traveling transmission), and a front wheel transmission 32 (traveling transmission).

[0061] The power of the motor 26 is transmitted via a transmission shaft 29 to the continuously variable transmission 28 (traveling transmission), the auxiliary transmission 30 (traveling transmission), and the front wheel transmission 32 (traveling transmission), and then transmitted from the continuously variable transmission 28 (traveling transmission), the auxiliary transmission 30 (traveling transmission), and the front wheel transmission 32 (traveling transmission) to the front wheel 1 (traveling device) and the rear wheel 2 (traveling device).

[0062] (Configuration of the transmission system to the working device connected to the top link and lower link) 1 and 3, the PTO transmission 35 is housed inside the rear case 13 of the transmission case 11, and the PTO shaft 36 is provided at the rear of the rear case 13 of the transmission case 11. When a working device is connected to the top link 15 and the lower link 16, a transmission shaft (not shown) is connected between the PTO shaft 36 and the working device.

[0063] When the power of the motor 26 is transmitted to the continuously variable transmission 28 via the transmission shaft 29, the power of the transmission shaft 29 (power that is not changed in speed by the continuously variable transmission 28) is transmitted to the PTO transmission 35, and the power changed in speed by the PTO transmission 35 is transmitted to the PTO shaft 36, and then transmitted from the PTO shaft 36 to the working device.

[0064] (Configuration related to lift arm lifting operation) As shown in FIG. 3, a single-acting hydraulic cylinder 37 is provided at the upper rear portion of the transmission case 11 (rear case 13), and the hydraulic cylinder 37 moves the lift arm 17 up and down.

[0065] A hydraulic pump 38 and a control valve 39 are provided inside the rear part of the transmission case 11 (rear case 13). Lubricating oil stored in the transmission case 11 (rear case 13) is supplied to the hydraulic pump 38 as hydraulic oil, and is then supplied from the hydraulic pump 38 to the control valve 39.

[0066] A pump motor 40 is provided at the upper rear part of the transmission case 11 (rear case 13), and drives a hydraulic pump 38. The inverter 24 converts DC power from the battery 25 into AC power and supplies it to the pump motor 40, causing the pump motor 40 to operate.

[0067] The control valve 39 supplies and discharges hydraulic oil to the hydraulic cylinder 37, which then raises and lowers the lift arm 17. The hydraulic oil discharged from the hydraulic cylinder 37 is returned to the transmission case 11 (rear case 13) through the control valve 39.

[0068] With the above configuration, as shown in Figures 1 and 3, a hydraulic cylinder 37 that raises and lowers the top link 15 (link mechanism) and the lower link 16 (link mechanism) to which the working device is connected, and a hydraulic pump 38 that supplies hydraulic oil to the hydraulic cylinder 37 are provided in the transmission case 11 (rear case 13). A pump motor 40 that drives the hydraulic pump 38 is provided between the driver's seat 7 of the driver's section 5 and the transmission case 11 (rear case 13) in a side view.

[0069] (First Alternative Embodiment of the Invention) 1 and 2, the motor 26 may be connected to the support base 23 and supported on the airframe 3. The motor 26 may be connected to the pillar frame 19 and supported on the airframe 3.

[0070] 1 and 2, the inverter 24 may be connected to the pillar frame 19 and supported on the fuselage 3. As shown in FIG. 7, which will be described later, the inverter 24 may be provided between the driver's seat 7 of the driver's section 5 and the transmission case 11 (the front case 12 and the rear case 13) in a side view.

[0071] (Second Alternative Embodiment of the Invention) As shown in FIG. 4, when the battery 25 is provided in front of the driving unit 5, the inverter 24 may be provided in front of the battery 25.

[0072] According to the configuration shown in Figure 4, the inverter 24 is arranged along the vertical direction when viewed from the side and along the horizontal direction when viewed from the front, and is arranged between the front of the hood 4 and the front of the battery 25.

[0073] (Third Alternative Embodiment of the Invention) As shown in FIG. 5, the motor 26 may be provided above the front axle case 14 (front wheels 1 (front running device)) in a side view.

[0074] In the configuration shown in FIG. 5, the motor 26 is mounted downward in front of the battery 25, making the position of the motor 26 a little higher. Therefore, another support stand 41 can be provided on the support stand 23, and the battery 25 can be attached to the support stand 41, thereby making the position of the battery 25 a little higher.

[0075] In the configuration shown in Fig. 5, the motor 26 may be connected to a support base 41 and supported on the vehicle body 3. As shown in Fig. 4, the inverter 24 may be provided in front of the battery 25. As shown in Fig. 7 described below, the inverter 24 may be provided between the driver's seat 7 of the driver's section 5 and the transmission case 11 (front case 12 and rear case 13) in a side view.

[0076] (Fourth Alternative Embodiment of the Invention) As shown in FIG. 6, the motor 26 may be provided forward of the front axle case 14 (front wheels 1 (front traveling device)) in a side view.

[0077] 6, the motor 26 is disposed at a low position, so that the gear transmission type transmission mechanism 42 is attached to the output shaft (not shown) of the motor 26 and disposed so as to extend upward from the motor 26. The transmission shaft 29 is connected across the upper output shaft (not shown) of the transmission mechanism 42 and the continuously variable transmission 28 (see FIG. 3), so that the transmission shaft 29 is disposed above the front axle case 14 along the longitudinal direction.

[0078] The power of the output shaft of the motor 26 is transmitted to the transmission mechanism 42, and then transmitted from the upper output shaft of the transmission mechanism 42 via the transmission shaft 29 to the continuously variable transmission 28 (see Figure 3), and then to the front wheel 1 and the rear wheel 2.

[0079] In the configuration shown in Fig. 6, the motor 26 may be connected to a support base 23 and supported on the vehicle body 3. As shown in Fig. 4, the inverter 24 may be provided in front of the battery 25. As shown in Fig. 7 described below, the inverter 24 may be provided between the driver's seat 7 of the driver's section 5 and the transmission case 11 (front case 12 and rear case 13) in a side view.

[0080] (Fifth Alternative Embodiment of the Invention) As shown in Figure 7, when the transmission case 11 (front case 12 and rear case 13) is provided below the driver's seat 7 of the driver's section 5, the motor 26 may be attached to the upper part of the transmission case 11 (front case 12 and rear case 13) and provided between the driver's seat 7 of the driver's section 5 and the transmission case 11 (front case 12 and rear case 13) when viewed from the side.

[0081] By attaching the inverter 24 to a support frame 43 provided in the driver's section 5 to support the driver's seat 7, the inverter 24 may be provided between the driver's seat 7 of the driver's section 5 and the transmission case 11 (front case 12 and rear case 13) when viewed from the side.

[0082] In the configuration shown in Figure 7, the motor 26 is attached to the upper part of the transmission case 11 (front case 12 and rear case 13) so that the output shaft (not shown) of the motor 26 faces forward, and a gear transmission type transmission mechanism 44 is attached across the output shaft of the motor 26 and the forward-facing input shaft (not shown) of the continuously variable transmission 28 (see Figure 3).

[0083] The power of the output shaft of the motor 26 is transmitted to the transmission mechanism 44, and then from the lower output shaft (not shown) of the transmission mechanism 44 to the continuously variable transmission 28 (see Figure 3), and then to the front wheel 1 and the rear wheel 2.

[0084] 7, the inverter 24 is suspended from the lower part of the support frame 43 and is provided horizontally. The inverter 24 is disposed at a position spaced above the motor 26 and the pump motor 40, and at a position spaced above the upper part of the transmission case 11 (the front case 12 and the rear case 13).

[0085] (Sixth Alternative Embodiment of the Invention) As shown in Fig. 7, when the motor 26 is provided between the driver's seat 7 of the driver's section 5 and the transmission case 11 (the front case 12 and the rear case 13) in a side view, the inverter 24 may be provided rearward of the battery 25 as shown in Fig. 1. As shown in Fig. 4, the inverter 24 may be provided forward of the battery 25.

[0086] (Seventh Alternative Embodiment of the Invention) As shown in FIG. 8, the working motors 45 may be provided on the right and left lower links 16 (link mechanisms).

[0087] 8, when the working device is connected to the top link 15 and the lower link 16, a transmission shaft (not shown) is connected between the work motor 45 and the working device. The inverter 24 converts DC power from the battery 25 into AC power and supplies it to the work motor 45, causing the work motor 45 to operate and transmit the power of the work motor 45 to the working device. In the configuration shown in Fig. 8, the PTO transmission 35 and the PTO shaft 36 shown in Fig. 1 and Fig. 3 may be eliminated. The work motor 45 may be provided in the top link 15 (link mechanism).

[0088] (Eighth Alternative Embodiment of the Invention) The vehicle may have a four-wheel steering structure in which the front wheels 1 and rear wheels 2 are steered in the same phase and in opposite phases by the steering handle 6. A crawler type traveling device (not shown) may be provided as the front traveling device instead of the front wheels 1. A crawler type traveling device (not shown) may be provided as the rear traveling device instead of the rear wheels 2. The front wheels 1 and the rear wheels 2 may be configured by a single crawler type traveling device (not shown). [Industrial Applicability]

[0089] The present invention can be applied not only to electric tractors that drive the traveling gear using a motor, but also to hybrid tractors that drive the traveling gear using an engine and a motor, and can also be applied to construction work vehicles and agricultural work vehicles other than tractors. [Explanation of symbols]

[0090] 1 Front wheel (running gear) 2 Rear wheels (running gear) 5. Driving section 6 Control Handle 7 Driver's seat 11 Mission case 15 Top link (link mechanism) 16 Lower link (link mechanism) 19 Pillar frame 19a Right part 19b left part 19c upper part 22 Steering shaft 24 inverters 25 Battery 26 Motor 28 Continuously variable transmission (transmission for driving) 30 Sub-transmission device (transmission device for driving) 32 Front wheel transmission (transmission for driving) 37 Hydraulic cylinder 38 Hydraulic Pump 40 Pump motor

Claims

1. A vehicle comprising: a traveling device; a battery; a motor that supplies power to the traveling device; an inverter that operates the motor; and a driving unit; a pillar frame having a right portion along the up-down direction, a left portion along the up-down direction, and an upper portion spanning an upper portion of the right portion and an upper portion of the left portion; The battery is provided in front of the driving unit, the inverter is provided between the battery and the driving unit in a side view, the inverter is provided along the up-down direction in a side view and along the left-right direction in a plan view, The pillar frame is provided between the battery and the driving unit in a side view, The work vehicle, wherein the inverter is provided between the right portion and the left portion and below the upper portion in a front view.

2. A vehicle comprising: a driving device; a battery; a motor that supplies power to the driving device; an inverter that operates the motor; a driving section; and a transmission case that houses a transmission for driving; The battery is provided in front of the driving unit, the inverter is provided between the battery and the driving unit in a side view, The power of the motor is transmitted to the transmission and from the transmission to the traveling device, the transmission case is provided below a driver's seat in the driver's section, a link mechanism to which a working device is connected is provided on the transmission case so as to be movable up and down; a hydraulic cylinder for lifting and lowering the link mechanism and a hydraulic pump for supplying hydraulic oil to the hydraulic cylinder are provided in the transmission case; A work vehicle in which a pump motor that drives the hydraulic pump is provided between the driver's seat and the transmission case in a side view.

3. A steering handle for operating the traveling device is provided in front of the driving section, A steering shaft for operating the traveling device extends downward from the operating handle, 3. The work vehicle according to claim 1, wherein the inverter is provided between the battery and the steering shaft in a side view.

4. 3. The work vehicle according to claim 1, wherein the motor is provided below the inverter.

5. A vehicle comprising: a driving device; a battery; a motor that supplies power to the driving device; an inverter that operates the motor; a driving section; and a transmission case that houses a transmission for driving; The battery is provided in front of the driving unit, the inverter is provided in front of the battery, The power of the motor is transmitted to the transmission and from the transmission to the traveling device, the transmission case is provided below a driver's seat in the driver's section, a link mechanism to which a working device is connected is provided on the transmission case so as to be movable up and down; a hydraulic cylinder for lifting and lowering the link mechanism and a hydraulic pump for supplying hydraulic oil to the hydraulic cylinder are provided in the transmission case; A work vehicle in which a pump motor that drives the hydraulic pump is provided between the driver's seat and the transmission case in a side view.

6. 6. The work vehicle according to claim 5, wherein the inverter is provided along the vertical direction in a side view and along the horizontal direction in a plan view.

7. A vehicle comprising a driving device, a battery, a motor, an inverter for operating the motor, a driving section, and a transmission case for accommodating a transmission for driving; The power of the motor is transmitted to the transmission and from the transmission to the traveling device, the transmission case is provided below a driver's seat in the driver's section, the inverter is provided between the driver's seat and the transmission case in a side view, a link mechanism to which a working device is connected is provided on the transmission case so as to be movable up and down; a hydraulic cylinder for lifting and lowering the link mechanism and a hydraulic pump for supplying hydraulic oil to the hydraulic cylinder are provided in the transmission case; A work vehicle in which a pump motor that drives the hydraulic pump is provided between the driver's seat and the transmission case in a side view.

8. 8. The work vehicle according to claim 7, wherein the inverter is provided along a horizontal direction.

9. 9. The work vehicle according to claim 7, wherein the motor is provided between the driver's seat and the transmission case in a side view.

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