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 battery, which is a heavy object, at an appropriate position in the work vehicle.SOLUTION: A work vehicle includes: travel devices 1, 2; a battery 25; a motor 27 configured to supply power to the travel devices 1, 2; an inverter 24 configured to operate the motor 27; and an operation section 5. The battery 25 is provided between the front travel device 1 and the rear travel device 2 and below a floor 8 of 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] In Patent Document 1, the battery, which is a heavy object, is located at the front of the work vehicle, so when the work implement is supported at the rear of the work vehicle and the work vehicle is driven for work, the front-to-rear balance of the work vehicle is favorable. However, there are also cases where the work implement is supported at the front of the work vehicle and the work vehicle is driven for work.

[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 implement is supported on the work vehicle by installing a heavy battery 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 that supplies power to the traveling device, an inverter that operates the motor, and a driving unit, and the battery is located between the front traveling device and the rear traveling device and below the floor of the driving unit when viewed from the side. 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 the first battery is located between the front traveling device and the rear traveling device and below the floor of the driving unit in a side view, and the second battery is supported in a position forward of and above the first battery.

[0007] According to the present invention, the battery is located near the center of the front and rear of the work vehicle, so as long as the work implement is relatively light, the front-to-rear balance of the work vehicle is unlikely to be disrupted whether the work implement is supported at the front or rear of the work vehicle. This makes it possible to obtain a work vehicle that is suitable for work travel and has relatively light work implements supported at the front and rear of the work vehicle. According to the present invention, the battery is provided below the floor of the driver's section, and since the battery is provided at a low position, the center of gravity of the work vehicle can be lowered, thereby improving the running stability of the work vehicle. Since it is undesirable to install a battery with a large vertical width below the floor of the driver's section, as the bottom of the battery would be close to the ground, it is preferable to install a battery with a small vertical width below the floor of the driver's section. However, if the battery has a small vertical width, there is a possibility that the total capacity of the batteries installed in the work vehicle will be insufficient. According to the present invention, in addition to the first battery being located below the floor of the driver's section between the front and rear traveling devices, the second battery is located in a different position, so that the overall battery capacity of the work vehicle is unlikely to be insufficient. According to the present invention, the second battery is supported in a position forward of and above the first battery. The area forward of and above the first battery is a relatively large space in the work vehicle. The provision of the first battery eliminates the need to configure the second battery to be larger than necessary, and the second battery can be provided in a location with a relatively large space, which increases the freedom in the placement of the second battery and allows it to be provided without difficulty.

[0008] In the present invention, it is preferable that a right body frame and a left body frame are provided below the floor and arranged in the fore-and-aft direction, and that the battery is provided between the right body frame and the left body frame in a plan view.

[0009] In a work vehicle, the right and left machine frames may be arranged in the front-to-rear direction below the floor of the driver's section. According to the present invention, the battery 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 battery, which is advantageous in terms of preventing damage to the battery.

[0010] In the present invention, it is preferable that the first battery is located between the front and rear traveling devices and below the floor in a side view, and the second battery is supported at a position forward of and above the first battery.

[0011] Since it is undesirable to install a battery with a large vertical width below the floor of the driver's section, as the bottom of the battery would be close to the ground, it is preferable to install a battery with a small vertical width below the floor of the driver's section. However, if the battery has a small vertical width, there is a possibility that the total capacity of the batteries installed in the work vehicle will be insufficient. According to the present invention, in addition to the first battery being located below the floor of the driver's section between the front and rear traveling devices, the second battery is located in a different position, so that the overall battery capacity of the work vehicle is unlikely to be insufficient.

[0012] According to the present invention, the second battery is supported in a position forward of and above the first battery. The area forward of and above the first battery is a relatively large space in the work vehicle. The provision of the first battery eliminates the need to configure the second battery to be larger than necessary, and the second battery can be provided in a location with a relatively large space, which increases the freedom in the placement of the second battery and allows it to be provided without difficulty.

[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, 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 battery is provided between the driver's seat and the transmission case in a side view.

[0014] According to the present invention, the battery is positioned relatively far rearward from the center of the front and rear of the vehicle, which makes it easier for the battery to function as a balance weight when a relatively heavy 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 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 space between the driver's seat and the transmission case can be effectively utilized to install the battery relatively easily, and the battery support structure can be constructed relatively easily, thereby simplifying the battery support structure. According to the present invention, work on the battery can be easily performed by removing the driver's seat, etc., and therefore, the ease of maintenance of the battery can be improved.

[0016] 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, a driving unit, and a rope frame, and the battery is provided on the rope frame.

[0017] A work vehicle may be provided with a rope frame, which is constructed to have sufficient strength. According to the present invention, the battery is mounted on the rope frame, so that the battery can be mounted on the work vehicle with sufficient strength.

[0018] In the present invention, it is preferable that a transmission case that houses a transmission for driving is provided below the driver's seat of the driver's section, the power of the motor is transmitted to the transmission and from the transmission to the driving device, the first battery is provided on the ROPS frame, and the second battery is provided between the driver's seat and the transmission case in a side view.

[0019] In work vehicles, the ROPs frame is often configured to be exposed upward, making it difficult to install a large battery in the ROPs frame. However, if a relatively small battery is installed in the ROPs frame, there is a possibility that the total battery capacity of the work vehicle will be insufficient. According to the present invention, in addition to mounting the first battery on the ROPS frame, the second battery is mounted in a different location, so that the overall capacity of the batteries mounted on the work vehicle is unlikely to be insufficient.

[0020] 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 second battery is provided between the driver's seat and the transmission case. This allows the second battery to be provided relatively easily by effectively utilizing the space between the driver's seat and the transmission case, and the support structure for the second battery can be configured relatively easily, thereby simplifying the support structure for the second battery. According to the present invention, work can be easily performed on the second battery by performing work such as removing the driver's seat, and therefore the ease of maintenance of the second battery can be improved.

[0021] 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 equipped 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 in the driving section, the battery being located between the driver's seat and the transmission case in a side view, a link mechanism that transmits power from the motor to the transmission and from the transmission to the traveling device and to which a work device is connected is located 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 located in the transmission case, and a pump motor that drives the hydraulic pump is located between the driver's seat and the transmission case in a side 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, a driving section, a rope frame, and a transmission case that houses a transmission for traveling, wherein the battery is provided on the rope frame, 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 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.

[0022] 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.

[0023] 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.

[0024] 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]

[0025] [Figure 1] FIG. 2 is a left side view of the tractor. [Figure 2] FIG. 10 is a longitudinal sectional front view of the vicinity of the second battery 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 rear view of a tractor according to a fourth alternative embodiment of the invention. [Figure 8] FIG. 10 is a left side view of a tractor according to a fifth alternative embodiment of the invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] 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.

[0027] (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.

[0028] 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.

[0029] 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).

[0030] 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.

[0031] 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.

[0032] (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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] (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).

[0039] 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.

[0040] 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] (Battery configuration) 1 and 2, a first battery 25 and a second battery 26 are provided. The batteries 25 and 26 are configured by housing multiple stacks (not shown) in a cubic case, each stack having multiple battery modules (not shown) connected together.

[0042] The first battery 25 is disposed between the right and left body frames 10 and attached to the right and left body frames 10. The front portion of the first battery 25 is located below the pillar frame 119 and below the power steering mechanism 20, and the rear portion of the first battery 25 is close to the transmission case 11 (front case 12).

[0043] Support bases 23 are attached to the front of the right and left body frames 10, and are provided at a position higher than the body frames 10. A second battery 26 is attached to the support bases 23. The second battery 26 is provided forward of the inverter 24, and is provided above the body frames 10 and the front axle case 14.

[0044] The inverter 24 and the second battery 26 are covered by the hood 4 in the closed position. By opening the hood 4, maintenance work on the inverter 24 and the second battery 26 can be performed.

[0045] With the above configuration, as shown in Figures 1 and 2, the battery 25 (first battery 25) is located between the front wheels 1 (front running device) and the rear wheels 2 (rear running device) in a side view, and below the floor 8 of the driver's section 5.

[0046] A right body frame 10 and a left body frame 10 are provided below the floor 8 of the driver's section 5 and arranged in the fore-and-aft direction, and a battery 25 (first battery 25) is provided between the right body frame 10 and the left body frame 10 in a plan view (front view). The second battery 26 is supported at a position forward of and above the first battery 25.

[0047] (Motor configuration) As shown in Figures 1 and 2, right and left mounting brackets 42 are connected to the inner surfaces of the right and left body frames 10, and the right and left parts of the motor 27 are connected to the right and left mounting brackets 42.

[0048] The motor 27 is provided between the front wheel 1 and the rear wheel 2 in a side view, and is provided below the support base 23, below the second battery 26, and below the inverter 24. The inverter 24 and the second battery 26 are provided above the motor 27 in a side view.

[0049] Inverter 24 converts DC power from batteries 25, 26 into AC power and supplies it to motor 27, which operates motor 27. Power from motor 27 is supplied to front wheels 1 and rear wheels 2 as shown in FIG.

[0050] (Configuration of transmission system to front and rear wheels) 1, 2, 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. A transmission shaft 29 is connected between an output shaft 27a of the motor 27 and an input shaft 28a of the continuously variable transmission 28, and the power of the motor 27 is transmitted to the continuously variable transmission 28 via the 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.

[0051] 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.

[0052] Power branched between the auxiliary transmission 30 and the rear wheel differential device 31 is transmitted to the front wheel transmission 32. An output shaft 32a of the front wheel transmission 32 passes through the inside of the front case 12 of the transmission case 11 and protrudes forward from the bottom of the front case 12 of the transmission case 11.

[0053] A front wheel differential device 34 is provided inside the front axle case 14, and an input shaft 34a of the front wheel differential device 34 extends rearward from the front axle case 14. A transmission shaft 33 is connected between the output shaft 32a of the front wheel transmission device 32 and the input shaft 34a of the front wheel differential device 34. Power from the front wheel transmission device 32 is transmitted via the transmission shaft 33 to the front wheel differential device 34, and then from the front wheel differential device 34 to the front wheels 1.

[0054] 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.

[0055] 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).

[0056] The power of the motor 27 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).

[0057] The first battery 25 is provided below the output shaft 27a of the motor 27, the input shaft 28a of the continuously variable transmission 28, and the transmission shaft 29. The first battery 25 is provided above the output shaft 32a of the front wheel transmission 32, the input shaft 34a of the front wheel differential device 34, and the transmission shaft 33.

[0058] A transmission shaft 29 is provided above the first battery 25 and below the floor 8 along the front-to-rear direction, and a transmission shaft 33 is provided below the first battery 25 and along the front-to-rear direction. The first battery 25 is provided between the transmission shaft 29 and the transmission shaft 33 in a side view.

[0059] (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.

[0060] When the power of the motor 27 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.

[0061] (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.

[0062] 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.

[0063] 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 batteries 25, 26 into AC power and supplies it to the pump motor 40, causing the pump motor 40 to operate.

[0064] 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.

[0065] 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.

[0066] (First Alternative Embodiment of the Invention) 1 and 2, the motor 27 may be connected to the support base 23 and supported on the airframe 3. The motor 27 may be connected to the pillar frame 19 and supported on the airframe 3.

[0067] 1 and 2, the inverter 24 may be connected to the pillar frame 19 and supported on the fuselage 3. The inverter 24 may be provided forward of the second battery 26 in a side view.

[0068] (Second Alternative Embodiment of the Invention) As shown in Figure 4, when the battery 25 is positioned between the right and left body frames 10 and attached to the right and left body frames 10, the battery 25 may be configured to have a large capacity so that the front of the battery 25 is located above the front axle case 14 and the rear of the battery 25 is close to the transmission case 11 (front case 12).

[0069] As shown in Figure 4, the second battery 26 (see Figure 1) may be eliminated. By positioning the front portion of the battery 25 above the front axle case 14, the motor 27 may be provided forward of the front axle case 14 (front wheels 1 (front traveling device)) in a side view.

[0070] 4, the motor 27 is disposed at a low position, so that the gear transmission type transmission mechanism 41 is attached to the output shaft 27a of the motor 27 and disposed so as to extend upward from the motor 27. The transmission shaft 29 is connected across the upper output shaft 41a of the transmission mechanism 41 and the input shaft 28a of the continuously variable transmission 28 (see FIG. 3), and the transmission shaft 29 is disposed above the front axle case 14 and the battery 25 and below the floor 8 along the fore-and-aft direction.

[0071] The power of the output shaft 27a of the motor 27 is transmitted to the transmission mechanism 41, and then from the output shaft 41a of the transmission mechanism 41 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.

[0072] In the configuration shown in FIG. 4, the motor 27 is disposed at a low position, so the support base 23 may be configured to be low and the inverter 24 may be attached to the support base 23 along the horizontal direction. When the inverter 24 is attached to the support base 23 in the horizontal direction, the front part of the hood 4 is configured to be low, and the upper part of the hood 4 is configured to extend diagonally downward and forward from the upper part 19c of the pillar frame 19 in a side view. This provides a wide field of view downward and forward for the driver seated in the driver's seat 7 of the driver's section 5.

[0073] In the configuration shown in Fig. 4, the motor 27 may be connected to the support base 23 and supported on the airframe 3. The inverter 24 may be connected to the pillar frame 19 in the vertical direction and supported on the airframe 3, as shown in Fig. 1.

[0074] (Third Alternative Embodiment of the Invention) As shown in Figure 5, 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 battery 25 may be attached to the top 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.

[0075] In the configuration shown in Figure 5, if the pump motor 40 (see Figure 1) is attached to the right or left side of the transmission case 11 (rear case 13), the battery 25 can be easily attached to the top of the transmission case 11 (front case 12 and rear case 13).

[0076] The second battery 26 (see FIG. 1) may be omitted. If the capacity of the battery 25 alone is insufficient, the second battery 26 may be attached to the support base 23 as shown in FIG. If the second battery 26 is eliminated, the front portion of the hood 4 can be made lower and the upper portion of the hood 4 can be made to extend diagonally downward and forward from the upper portion 19c of the pillar frame 19 in a side view. This allows the driver seated in the driver's seat 7 of the driver's section 5 to have a wide field of view downward and forward.

[0077] 5, the battery 25 is not provided between the right and left body frames 10, so the motor 27 can be placed at a lower position than the position shown in Fig. 1. This allows the support base 23 to be configured to be lower, and the inverter 24 can be placed at a lower position than the position shown in Fig. 1. In the configuration shown in FIG. 5, the inverter 24 may be attached to the support base 23 along the horizontal direction, as shown in FIG.

[0078] (Fourth Alternative Embodiment of the Invention) As shown in FIGS. 6 and 7, the battery 25 may be provided on the ROP frame 9 provided behind the driver's seat 7. The rope frame 9 is made by bending a square pipe material, and has a right portion 9a, a left portion 9b, and an upper portion 9c.

[0079] The right portion 9a of the ROP frame 9 is provided along the vertical direction, and the lower portion of the right portion 9a of the ROP frame 9 is connected to the transmission case 11 (rear case 13). The left portion 9b of the ROP frame 9 is provided along the vertical direction, and the lower portion of the left portion 9b of the ROP frame 9 is connected to the transmission case 11 (rear case 13). The upper portion 9c of the ROP frame 9 is provided along the horizontal direction, and is connected to the upper portion of the right portion 9a of the ROP frame 9 and the upper portion of the left portion 9b.

[0080] The battery 25 is configured to have a small front-to-rear width, and is positioned between the right part 9a and the left part 9b of the ROP frame 9 when viewed from the rear (front), and is connected to the right part 9a and the left part 9b of the ROP frame 9.

[0081] The battery 25 is provided behind the driver's seat 7 of the driver's section 5 along the vertical and horizontal directions. The battery 25 overlaps with the right portion 9a and the left portion 9b of the ROPs frame 9 in a side view, and overlaps with the upper portion 9c of the ROPs frame 9 in a plan view.

[0082] 6 and 7, the second battery 26 (see FIG. 1) may be eliminated. A headrest (not shown) may be attached to the portion above the driver's seat 7 in front of the battery 25.

[0083] (Fifth Alternative Embodiment of the Invention) As shown in Figure 8, when the first battery 25 is installed on the ROPS frame 9, the second battery 26 may be attached to the top of the transmission case 11 (front case 12 and rear case 13) and installed 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.

[0084] 6 and 7, the first battery 25 is disposed between the right portion 9a and the left portion 9b of the ROP frame 9 in a rear view (front view) and is connected to the right portion 9a and the left portion 9b of the ROP frame 9. The first battery 25 is provided behind the driver's seat 7 of the driver's section 5 along the vertical and horizontal directions. The first battery 25 overlaps with the right portion 9a and the left portion 9b of the ROP frame 9 in a side view and overlaps with the upper portion 9c of the ROP frame 9 in a plan view.

[0085] When first and second batteries 25, 26 are provided as shown in FIG. 8, the first battery 25 can be configured to be lower than the battery 25 shown in FIGS. 8, a headrest (not shown) may be attached to the upper part of first battery 25. Inverter 24 may be attached to support base 23 along the horizontal direction as shown in FIG.

[0086] In the configuration shown in Figure 8, if the pump motor 40 (see Figure 1) is attached to the right or left side of the transmission case 11 (rear case 13), the second battery 26 can be easily attached to the top of the transmission case 11 (front case 12 and rear case 13).

[0087] (Sixth Alternative Embodiment of the Invention) When first and second batteries 25, 26 are provided and the first battery 25 is provided on the ROPS frame 9, the second battery 26 may be provided between the right and left body frames 10 as shown in Fig. 1. The second battery 26 may be attached to the support base 23 as shown in Fig. 1. The second battery 26 may be provided both between the right and left body frames 10 and on the support base 23.

[0088] (Seventh Alternative Embodiment of the Invention) As shown in FIG. 1, when the second battery 26 is provided in front of the driving unit 5, the inverter 24 may be provided in front of the second battery 26. According to this configuration, 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 second battery 26.

[0089] (Eighth Alternative Embodiment of the Invention) 1, 4, 5, 6, and 8, the motor 27 may be provided above the front axle case 14 (front wheels 1 (front traveling device)) in side view. In this configuration, the motor 27 may be connected to the support base 23 and supported on the vehicle body 3. In the configurations shown in FIGS. 1, 5, 6 and 8, the motor 27 may be provided forward of the front axle case 14 (front wheels 1 (front traveling device)) in side view, as shown in FIG.

[0090] (Ninth Alternative Embodiment of the Invention) In the configuration shown in Figures 1, 4, 5, 6, and 8, the motor 27 may be attached to the top of the transmission case 11 (front case 12 and rear case 13) and may be located 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.

[0091] (Tenth Alternative Embodiment of the Invention) In the configuration shown in Figures 1, 4, 5, 6, and 8, the inverter 24 may be attached to a support frame (not shown) provided in the driver's section 5 to support the driver's seat 7, so that the inverter 24 is 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.

[0092] (Eleventh Alternative Embodiment of the Invention) In the rope frame 9 made of square pipe material, the first battery 25 may be provided inside the square pipe of the rope frame 9. With this configuration, the first battery 25 is not exposed to the outside of the ROPS frame 9, so the driver seated in the driver's seat 7 has good rear visibility. By providing the second battery 26 between the driver's seat 7 of the driver's section 5 and the transmission case 11 (front case 12 and rear case 13), the total capacity of the batteries 25, 26 can be secured.

[0093] Instead of providing the ROP frame 9 behind the driver's seat 7, the ROP frame 9 may be provided in the pillar frame 19 portion in a side view, so that the ROP frame 9 is provided in front of the steering handle 6.

[0094] (Twelfth 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). The first and second batteries 25 and 26 may be attached to the support base 23 and provided inside the hood 4 . [Industrial Applicability]

[0095] 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]

[0096] 1 Front wheel (running gear) 2 Rear wheels (running gear) 5. Driving section 7 Driver's seat 8 floors 9 Rops Frame 10 Aircraft Frame 11 Mission case 15 Top link (link mechanism) 16 Lower link (link mechanism) 24 inverters 25 Battery 26 Battery 27 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; The first battery is provided between the front traveling device and the rear traveling device and below a floor of the driving section in a side view, The work vehicle has a second battery supported at a position forward of and above the first battery.

2. a right body frame and a left body frame are provided below the floor and arranged along the front-rear direction, The work vehicle according to claim 1 , wherein the first battery is provided between the right body frame and the left body frame in a plan view.

3. A transmission case is provided to house the 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, 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; 3. The work vehicle according to claim 1, wherein a pump motor that drives the hydraulic pump is provided between the driver's seat and the transmission case in a side view.

4. 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, the battery is provided between the driver's seat and the transmission case in a side view, The power of the motor is transmitted to the transmission and from the transmission to the traveling device, 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.

5. A vehicle comprising a running device, a battery, a motor that supplies power to the running device, an inverter that operates the motor, a driving section, a rope frame, and a transmission case that houses a transmission for running; The battery is provided on the rope frame, 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. The first battery is provided on the rope frame, 6. The work vehicle according to claim 5, wherein the second battery is provided between the driver's seat and the transmission case in a side view.

Images