Work vehicle

Abstract

To achieve improvement of front-back balance of a work vehicle when a work device is supported by the work vehicle by providing a motor, which is a heavy object, at an appropriate position.SOLUTION: A work vehicle includes: travel devices 1, 2; a battery 25; a motor 26; an inverter 24 configured to operate the motor 26; an operation section 5 provided with a steering wheel 6 for operating the travel device 1; and a transmission case 11 housing a transmission for traveling. The motor 26 is provided between the front travel device 1 and the rear travel device 2 and below the steering wheel 6 in a side view. Power from the motor 26 is transmitted to the transmission via a transmission shaft 29 and transmitted from the transmission to the travel devices 1, 2.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. Power from the motor is transmitted to the transmission, and from the transmission to the front wheels (corresponding to the traveling device) and rear 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] In Patent Document 1, the motor, which is a heavy object, is located in the center of the front and rear of the work vehicle, so the motor has little effect on the front-to-rear balance of the work vehicle. However, with a work vehicle, the work equipment is supported at the front of the vehicle while the vehicle is traveling for work, or at the rear of the vehicle while the vehicle is traveling for work, so the weight of the work equipment can easily change the front-to-rear balance of the vehicle.

[0005] The present invention aims to configure a work vehicle so that the front-to-rear balance of the work vehicle can be improved when a work device is supported on the work vehicle by installing a heavy motor in an appropriate position. [Means for solving the problem]

[0006] The work vehicle of the present invention is equipped with a traveling device, a battery, a motor, an inverter that operates the motor, a driving section provided with a steering handle that operates the traveling device, and a transmission case that houses a transmission for traveling, and the motor is provided between the front traveling device and the rear traveling device and below the steering handle in a side view, and the power of the motor is transmitted to the transmission via a transmission shaft and from the transmission to the traveling device.

[0007] According to the present invention, the motor is positioned slightly forward of the center of the front and rear of the work vehicle, so that when a relatively light working device is supported at the rear of the work vehicle, the motor can easily function as a balance weight. This makes it possible to obtain a work vehicle that is suitable for work travel with a relatively light working device supported at the rear of the work vehicle.

[0008] According to the present invention, since the motor is provided between the front and rear traveling devices, the motor has little effect on the front-to-rear balance of the work vehicle when the working implement is not supported by the work vehicle. The motor is provided below the steering handle of the driver's section, at a relatively low position, which is advantageous in terms of lowering the center of gravity of the work vehicle. This improves the running stability of the work vehicle.

[0009] In the present invention, it is preferable that a right body frame and a left body frame are provided below the driving section and arranged in the fore-and-aft direction, and that the motor is provided between the right body frame and the left body frame in a plan view.

[0010] In a work vehicle, the right and left machine frames may be disposed below the driver's section along the front-to-rear direction. According to the present invention, the motor is provided between the right and left body frames and is protected by the right and left body frames, which reduces the chance of small stones and the like being thrown up during work travel hitting the motor, which is advantageous in terms of preventing damage to the motor.

[0011] The work vehicle of the present invention is equipped with a traveling device, a battery, a motor, an inverter that operates the motor, a driving unit, and a transmission case that houses a transmission for traveling, and the motor is arranged above or forward of the front traveling device in a side view, and the power of the motor is transmitted to the transmission via a transmission shaft and from the transmission to the traveling device.

[0012] According to the present invention, the motor is positioned relatively far forward from the center of the front and rear of the vehicle, so that when a relatively heavy working implement is supported at the rear of the vehicle, the motor can easily function as a balance weight, thereby making it possible to obtain a vehicle that is suitable for work travel with a relatively heavy working implement supported at the rear of the vehicle. According to the present invention, the motor is more easily exposed to outside air when the work vehicle is moving forward, which is advantageous in terms of cooling the motor.

[0013] 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, the transmission case being located below the driver's seat of the driving section, the motor being located between the driver's seat and the transmission case in a side view, and the power of the motor being transmitted to the transmission and from the transmission to the running device.

[0014] According to the present invention, the motor is positioned relatively far rearward from the center of the front and rear of the 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 vehicle, thereby making it possible to obtain a vehicle that is suitable for traveling when a relatively heavy working implement is supported at the front of the vehicle.

[0015] 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, 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.

[0016] According to the present invention, the motor is positioned close to the transmission case, and the transmission system (transmission shaft, transmission mechanism, etc.) from the motor to the transmission device in the transmission case can be configured compactly, thereby simplifying the transmission system from the motor to the transmission device in the transmission case and reducing its weight. 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.

[0017] In the present invention, it is preferable that 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. A work vehicle according to one embodiment of the present invention is 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, the transmission case being located 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 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, and a pump motor that drives the hydraulic pump is located between the driver's seat and the transmission case in a side view.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] In the present invention, it is preferable that a link mechanism to which a working device is connected is provided on the transmission case so as to be movable up and down, and that a work motor for supplying power to the working device is provided on the link mechanism. A work vehicle according to one embodiment of the present invention is equipped with a running device, a battery, a motor, an inverter that operates the motor, a driving unit, and a transmission case that houses a transmission for running, and 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, and a work motor that supplies power to the work device is provided on the link mechanism.

[0022] In a work vehicle, a link mechanism is sometimes provided on a transmission case so that it can be raised and lowered, and a work device is sometimes connected to the link mechanism so that it can be raised and lowered. According to the present invention, a work motor is provided on the link mechanism, and power from the work motor can be supplied to the work device connected to the link mechanism. In this case, because the work motor is located close to the work device, the transmission system from the work motor to the work device can be configured to be short and simple. [Brief explanation of the drawings]

[0023] [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

[0024] 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.

[0025] (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.

[0026] 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.

[0027] 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).

[0028] 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.

[0029] 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.

[0030] (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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] (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).

[0038] The inverter 24 is arranged along the vertical direction when viewed from the side, and along the horizontal direction when viewed from the front (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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] (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.

[0043] 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.

[0044] 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).

[0045] 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.

[0046] (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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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).

[0051] 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).

[0052] (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.

[0053] 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.

[0054] (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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] (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.

[0060] 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.

[0061] (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.

[0062] 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.

[0063] (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.

[0064] 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.

[0065] 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.

[0066] (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.

[0067] 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.

[0068] 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 transmitted to the front wheel 1 and the rear wheel 2.

[0069] 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.

[0070] (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.

[0071] 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.

[0072] 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).

[0073] 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.

[0074] 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).

[0075] (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.

[0076] (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).

[0077] 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 transmitting power from 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).

[0078] (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]

[0079] 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]

[0080] 1 Front wheel (running gear) 2 Rear wheels (running gear) 5. Driving section 6 Control Handle 7 Driver's seat 10 Aircraft Frame 11 Mission case 15 Top link (link mechanism) 16 Lower link (link mechanism) 24 inverters 25 Battery 26 Motor 28 Continuously variable transmission (transmission for driving) 29 Transmission shaft 30 Sub-transmission device (transmission device for driving) 32 Front wheel transmission (transmission for driving) 37 Hydraulic cylinder 38 Hydraulic Pump 40 Pump motor 45 working motor

Claims

1. 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 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 that moves the link mechanism up and down; and a hydraulic pump that supplies hydraulic oil to the hydraulic cylinder. 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.

2. 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; 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 work motor for supplying power to the work device is provided on the link mechanism.

3. A steering handle is further provided in the driving section to operate the traveling device, The motor is provided between the front traveling device and the rear traveling device and below the steering handle in a side view, 3. The work vehicle according to claim 1, wherein the power of the motor is transmitted to the transmission device via a transmission shaft, and then transmitted from the transmission device to the traveling device.

4. a right body frame and a left body frame disposed along a front-rear direction below the driver's section; The work vehicle according to claim 3 , wherein the motor is provided between the right body frame and the left body frame in a plan view.

5. The motor is provided above the front traveling device or forward of the front traveling device in a side view, 3. The work vehicle according to claim 1, wherein the power of the motor is transmitted to the transmission device via a transmission shaft, and then transmitted from the transmission device to the traveling device.

6. the transmission case is provided below a driver's seat in the driver's section, the motor is provided between the driver's seat and the transmission case in a side view, 3. The work vehicle according to claim 1, wherein the power of the motor is transmitted to the transmission and then transmitted from the transmission to the traveling device.

Images