Work vehicle

Abstract

To enable an inverter device to be provided in a state that enables easy maintenance in a service vehicle including a transmission which outputs power to rear travel devices and an electric motor connected to the transmission.SOLUTION: In a service vehicle, an inverter device 21 is provided between front wheels 1 and rear travel devices 2 and in a portion located at a lateral side of a transmission case 13 of a space located below a floor part of an operation part 9.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a work vehicle having a traveling body supported by front wheels and a rear traveling device. [Background technology]

[0002] As shown in Patent Document 1, some of the above-mentioned work vehicles are equipped with a transmission (continuously variable transmission, forward / reverse switching device, gear transmission) that outputs power toward the rear traveling device (rear wheels), and an electric motor (motor generator) connected to the transmission. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-65349 Summary of the Invention [Problem to be solved by the invention]

[0004] In a work vehicle equipped with an electric motor or a motor generator, an inverter device is provided which is connected to the electric motor or the motor generator, and therefore it is desired that the inverter device be easy to maintain.

[0005] The present invention provides a work vehicle in which an inverter device can be installed in a state that makes maintenance easy. [Means for solving the problem]

[0006] The work vehicle according to the present invention comprises: The vehicle is provided with a traveling vehicle body supported by front wheels and a rear traveling device, and the traveling vehicle body is provided with a driver's section having a floor section for riding, a transmission that outputs toward the rear traveling device, a transmission case in which the transmission is housed, an electric motor connected to the transmission, and an inverter device connected to the electric motor, and the inverter device is provided in a space between the front wheels and the rear traveling device and below the floor section, at a location located to the side of the transmission case. A cooling device for cooling the inverter device and the inverter device are arranged in the vertical direction of the vehicle body, and the cooling device has a radiator for cooling coolant, a pump for circulating coolant between the radiator and the inverter device, and a coolant tank for storing coolant. are.

[0007] According to this configuration, the maintenance for the inverter device is passed from the lateral outer side of the vehicle body between the front wheels and the rear traveling device. Tena Since the inverter device can be installed in a state where maintenance is easy, the inverter device can be installed in a state where maintenance is easy. According to this configuration, since the cooling device is located near the inverter device, when maintenance of the inverter device is performed, maintenance of the cooling device can be easily performed at the same time. According to this configuration, the inverter device can be cooled by water cooling, and by arranging the cooling device near the inverter device, the hoses and piping of the cooling system can be shortened.

[0008] Another work vehicle according to the present invention includes: The vehicle is provided with a traveling vehicle body supported by front wheels and a rear traveling device, the traveling vehicle body being provided with a driving section having a floor section for riding on, an engine, a hybrid transmission having a motor generator and changing the speed of the driving force of the engine and outputting it toward the rear traveling device, a transmission case in which the hybrid transmission is housed, an exhaust gas treatment device that purifies exhaust from the engine, a reducing agent tank that stores a reducing agent to be supplied to the exhaust gas treatment device, and an inverter device connected to the motor generator, the inverter device being provided in a space between the front wheels and the rear traveling device and located below the floor, at a location that is located on one side of the transmission case in the vehicle width direction, and the reducing agent tank being provided in a space between the front wheels and the rear traveling device and located below the floor, at a location that is located on the other side of the transmission case in the vehicle width direction. A cooling device for cooling the inverter device and the inverter device are arranged in the vertical direction of the vehicle body, and the cooling device has a radiator for cooling coolant, a pump for circulating coolant between the radiator and the inverter device, and a coolant tank for storing coolant. are.

[0009] With this configuration, maintenance of the inverter device can be performed from the outer lateral side of the vehicle body between the front wheels and the rear traveling device on one side in the vehicle width direction. Since the weight of the inverter device and the weight of the reducing agent stored in the reducing agent tank are distributed to both sides of the transmission case and applied to the vehicle body, the inverter device can be installed in a position that makes it easy to maintain the left and right weight of the vehicle body while facilitating maintenance. According to this configuration, since the cooling device is located near the inverter device, when maintenance of the inverter device is performed, maintenance of the cooling device can be easily performed at the same time. According to this configuration, the inverter device can be cooled by water cooling, and by arranging the cooling device near the inverter device, the hoses and piping of the cooling system can be shortened.

[0010] In the present invention, It is preferable that a step for getting on and off is provided laterally outside the driver's section, and the inverter device is provided at a location located inside the step in the vehicle width direction.

[0011] According to this configuration, the step for getting on and off can be used as a guard member for the inverter device, so that the inverter device can be protected inexpensively without the need for a special guard member. Furthermore, even if a guard member is added, the added guard member can be small, so the inverter device can be protected inexpensively.

[0012]

[0013]

[0014] In the present invention, It is preferable that the cooling device is located below the inverter device.

[0015] According to this configuration, refrigerant can be replenished to the cooling device while preventing the refrigerant from adhering to the inverter device even if the refrigerant spills.

[0016]

[0017]

[0018] In the present invention, It is preferable that the inverter device and the battery to which the inverter device is connected are arranged side by side in the vertical direction of the vehicle body.

[0019] According to this configuration, the battery is located near the inverter device, so that when maintenance is performed on the inverter device, maintenance on the battery can be easily performed at the same time.

[0020] In the present invention, It is preferable that the battery is located below the inverter device.

[0021] According to this configuration, the inverter device covers the battery from above, so that the inverter device can be used as a cover for the battery.

[0022] In the present invention, It is preferable that a support member be provided across the transmission case and the inverter device to support the inverter device.

[0023] According to this configuration, the transmission case, which has high rigidity, supports the inverter device via the support member, so that the inverter device can be supported in a state where it is less likely to rattle.

[0024] In the present invention, It is preferable that a driver's cabin is provided that is supported on the vehicle body frame via a buffer material, and a support member is provided that is provided across the driver's cabin and the inverter device and supports the inverter device.

[0025] According to this configuration, the driver's cabin, which reduces the transmission of vibrations caused by running, supports the inverter device via the support member, so that vibrations caused by running can be made less likely to be transmitted to the inverter device. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 2 is a side view showing the left side of the tractor. [Figure 2]FIG. 2 is a side view showing the right side of the tractor. [Figure 3] FIG. 2 is a schematic diagram of a driving power transmission device. [Figure 4] FIG. 2 is a side view showing an inverter device and a cooling device. [Figure 5] FIG. 5 is a cross-sectional view of FIG. 4 . [Figure 6] FIG. 10 is a front view showing the installation of an inverter device according to another embodiment. [Figure 7] FIG. 10 is a side view showing the installation of an inverter device according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, with respect to the traveling body of a tractor (an example of a "work vehicle"), the direction of arrow F shown in Figures 1, 2, etc. will be referred to as the "front of the body," the direction of arrow B shown in Figures 1, 2, etc. will be referred to as the "rear of the body," the direction of arrow U shown in Figures 1, 2, etc. will be referred to as the "upper side of the body," and the direction of arrow D shown in Figures 1, 2, etc. will be referred to as the "lower side of the body." The direction towards the front of the page in Figure 1, the back of the page in Figure 2, and the direction of L shown in Figures 5 and 6 will be referred to as the "left side of the body," and the direction towards the back of the page in Figure 1, the front of the page in Figure 2, and the direction of R shown in Figures 5 and 6 will be referred to as the "right side of the body." The left-right direction of the body is the width direction of the body.

[0028] [Overall configuration of the tractor] As shown in FIGS. 1 and 2 , the tractor includes a traveling body 3 supported by a pair of left and right drivable front wheels 1 and a pair of left and right drivable rear wheels 2 serving as rear traveling devices. The traveling body 3 has a body frame 4 that is composed of an engine 5 provided at the front of the traveling body 3, a transmission case 13 whose front portion is connected to the rear of the engine 5, and a front frame 14 connected to the bottom of the engine 5. A driving unit 6 having the engine 5 is provided at the front of the traveling body 3. A driver's unit 9 is provided at the rear of the traveling body 3. A link mechanism (not shown) that connects a work implement such as a rotary tiller (not shown) so that it can be raised and lowered is provided at the rear of the transmission case 13, and a power takeoff shaft 12 that extracts and transmits power from the engine 5 to the connected work implement. In this embodiment, rear wheels 2 are provided as the rear traveling devices, but a mini-crawler type traveling device can also be used as the rear traveling device.

[0029] [Operation department] 1 and 2, the driver's section 9 is provided with a driver's seat 7, a floor section 11 (see FIG. 5) provided in front of and below the driver's seat 7 for boarding, a steering wheel 8 for steering the front wheels 1, and a driver's cabin 10 that covers the boarding space. The floor section 11 is supported by the driver's cabin 10. As shown in FIG. 5, an upwardly extending bulge 11a is provided in the center of the floor section 11 in the vehicle width direction (a portion located above the transmission case 13).

[0030] The driver's cabin 10 is supported on the vehicle body frame 4 via front buffer materials 10a (see FIGS. 1 and 2) and rear buffer materials 10b (see FIGS. 1 and 2), which reduce the transmission of vibrations caused by driving and the like to the driver's cabin 10. Specifically, the front left and right locations of the lower frame 10c of the driver's cabin 10 are connected to the front of the transmission case 13 via the front buffer materials 10a, and the rear left and right locations of the lower frame 10c are connected to the rear of the transmission case 13 via the rear buffer materials 10b.

[0031] 1 and 2, two upper and lower steps 50 for boarding and alighting used for getting on and off the driver's section 9 are provided on each of the outer right and left sides of the driver's section 9. In a side view of the vehicle body, the upper step 50a of the two upper and lower steps 50 is located below the boarding / alighting entrance 9a of the driver's section 9, and the lower step 50b of the two upper and lower steps 50 is offset toward the front of the vehicle body with respect to the upper step 50a.

[0032] [Motor unit] As shown in Figures 1 and 2, the motor section 6 has an engine compartment 52 formed by an engine bonnet 51. The engine 5 is mounted at the rear of the engine compartment 52. An exhaust gas treatment device 53 that purifies the exhaust gas from the engine 5 is mounted above the rear of the engine 5. In the exhaust gas treatment device 53, urea water is injected as a reducing agent supplied from a reducing agent tank 54 (see Figures 1 and 5) into the exhaust gas introduced from the engine 5, causing hydrolysis and purifying the exhaust gas by reducing nitrogen oxides contained in the exhaust gas. The purified exhaust gas is discharged from an exhaust pipe 53a connected to the exhaust gas treatment device 53.

[0033] [Traveling power transmission device] 1 and 2, a driving power transmission device 15 that transmits power from the engine 5 to the front wheels 1 and rear wheels 2 includes a transmission case 13 whose front portion is connected to the rear portion of the engine 5. The transmission case 13 is aligned with the engine 5 in the longitudinal direction of the vehicle body and extends in the longitudinal direction of the vehicle body at the center in the lateral width direction of the vehicle body. The engine 5 and the transmission case 13 are connected by connecting a flywheel housing (not shown) that is provided at the rear of the engine 5 and that houses a flywheel 5a (see FIG. 2) to a clutch housing (not shown) that is provided at the front of the transmission case 13.

[0034] As shown in FIG. 3, the transmission case 13 houses a hybrid transmission 16 that changes the speed of the power from the engine 5 and outputs it to the front wheels 1 and the rear wheels 2.

[0035] [Hybrid Transmission] 3, the hybrid transmission 16 is provided with an input shaft 23 that is provided in the front part of the transmission case 13 and receives power from the output shaft 5b of the engine 5, an electric transmission unit 16A that is located adjacent to the rear of the engine 5, and a gear transmission unit 16B that is located rearward of the electric transmission unit 16A. The axis of the input shaft 23 and the axis of the output shaft 5b are aligned on the same axis.

[0036] As shown in FIG. 3 , the electric transmission section 16A is housed in an electric transmission chamber 28 formed in the front part of the transmission case 13. The gear transmission section 16B is housed in a gear transmission chamber 29 formed in the rear part of the transmission case 13. The electric transmission chamber 28 is formed by the peripheral wall of the transmission case 13, a front wall 13a provided inside the front end of the transmission case 13, and a blocking wall 13b provided inside the middle part of the transmission case 13. The gear transmission chamber 29 is formed by the peripheral wall of the transmission case 13, a rear wall 13c located at the rear end of the transmission case 13, and the blocking wall 13b. The electric transmission chamber 28 and the gear transmission chamber 29 are adjacent to each other with the blocking wall 13b sandwiched between them. The electric transmission chamber 28 and the gear transmission chamber 29 are separated from each other by the blocking wall 13b to prevent communication between them.

[0037] [Electric Transmission] 3, the electric transmission unit 16A is provided between the engine 5 and the gear transmission unit 16B. The electric transmission unit 16A is provided with motor generators 17 and 18 serving as two electric motors.

[0038] The two motor generators 17, 18 are aligned in the longitudinal direction of the vehicle body. The first motor generator 17, which is the front of the two motor generators 17, 18, is provided on the side where the engine 5 is located relative to the second motor generator 18, which is the rear of the two motor generators 17, 18. The second motor generator 18 is provided on the side where the gear transmission unit 16B is located relative to the first motor generator 17. The rotational axes of the first motor generator 17, the second motor generator 18, and the input shaft 23 of the transmission case 13 are aligned on the same axis.

[0039] An input transmission mechanism 120 is provided on the side of the first motor generator 17 where the engine 5 is located. The input transmission mechanism 120 connects the rotor 17a of the first motor generator 17 and the input shaft 23 of the transmission case 13, and is configured to input the power of the input shaft 23 to the first motor generator 17. The input transmission mechanism 120 is made up of a planetary gear mechanism, and accelerates the power from the engine 5 transmitted to the input shaft 23 and inputs it to the rotor 17a of the first motor generator 17.

[0040] [Gear Transmission Section] 3, the gear transmission unit 16B is provided on the opposite side of the electric transmission unit 16A from the side on which the engine 5 is located. The gear transmission unit 16B is located adjacent to and behind the electric transmission unit 16A.

[0041] 3, the gear transmission unit 16B has a gear transmission mechanism 30. The gear transmission mechanism 30 is provided with a low-speed planetary transmission unit 100, a low-speed clutch 100C, a high-speed planetary transmission unit 110, a high-speed clutch 110C, a forward / reverse switching device 25, an auxiliary transmission device 26, a rear wheel differential mechanism 19, a front wheel transmission device 20, and a gear interlocking mechanism 27.

[0042] 3, the low-speed planetary transmission unit 100 includes a sun gear 101, planet gears 102, an internal gear 103, and a carrier 104. The internal gear 103 of the low-speed planetary transmission unit 100 is connected to the input shaft 23 by a first interlocking mechanism 126. The high-speed planetary transmission unit 110 includes a sun gear 111, planet gears 112, an internal gear 113, and a carrier 114. The carrier 114 of the high-speed planetary transmission unit 110 is connected to the input shaft 23 by a second interlocking mechanism 127.

[0043] An output transmission mechanism 130 is provided on the side of the second motor generator 18 where the gear transmission unit 16B is located. The output transmission mechanism 130 connects the second motor generator 18 to an input unit 135 located in front of the gear transmission unit 16B, and is configured to transmit the driving force of the second motor generator 18 to the input unit 135.

[0044] 3, the input portion 135 of the gear transmission unit 16B includes a first input shaft 136 connected to the sun gear 101 of the low-speed planetary transmission unit 100, and a second input shaft 137 connected to the sun gear 111 of the high-speed planetary transmission unit 110. The output transmission mechanism 130 includes a rotating shaft 131 connected to the rotor 18a of the second motor generator 18, a first gear interlocking mechanism 132 that connects the rotating shaft 131 to the first input shaft 136, and a second gear interlocking mechanism 133 that connects the rotating shaft 131 to the second input shaft 137. In this embodiment, the output transmission mechanism 130 of the second motor generator 18 is provided in the gear transmission chamber 29, but it may also be provided in the electric transmission chamber .

[0045] In the low-speed planetary transmission unit 100, the power of the input shaft 23 is transmitted to the internal gear 103 via the first interlocking mechanism 126 to drive the internal gear 103, the driving force of the second motor generator 18 is transmitted to the sun gear 101 via the output transmission mechanism 130 and the first input shaft 136 to drive the sun gear 101, the power from the engine 5 and the driving force of the second motor generator 18 are combined to produce a low-speed combined power, and the low-speed combined power is output from the carrier 104.

[0046] The low-speed clutch 100C is provided between the output section of the low-speed planetary transmission unit 100 and the input shaft 25a of the forward / reverse switching device 25, and is configured so that when switched to an engaged state (on state), it transmits the low-speed combined power output by the low-speed planetary transmission unit 100 to the forward / reverse switching device 25, and when switched to a disengaged state (off state), it cuts off the power transmission from the low-speed planetary transmission unit 100 to the forward / reverse switching device 25.

[0047] In the high-speed planetary transmission unit 110, the power of the input shaft 23 is transmitted to the carrier 114 via the second interlocking mechanism 127 to drive the planetary gear 112, the driving force of the second motor-generator 18 is transmitted to the sun gear 111 via the output transmission mechanism 130 and the second input shaft 137 to drive the sun gear 111, and the engine power from the input shaft 23 and the driving force of the second motor-generator 18 are combined to produce high-speed combined power, which is output from the internal gear 113. The high-speed combined power is a higher-speed combined power than the low-speed combined power produced by the low-speed planetary transmission unit 100.

[0048] The high-speed clutch 110C is provided between the output section of the high-speed planetary transmission section 110 and the input shaft 25a of the forward / reverse switching device 25, and is configured so that when switched to an engaged state (on state), it transmits the high-speed combined power output by the high-speed planetary transmission section 110 to the forward / reverse switching device 25, and when switched to a disengaged state (off state), it cuts off the power transmission from the high-speed planetary transmission section 110 to the forward / reverse switching device 25.

[0049] As shown in Fig. 3, the forward / reverse switching device 25 includes an input shaft 25a located rearward of the low-speed planetary transmission unit 100 and the high-speed planetary transmission unit 110, and an output shaft 25b arranged parallel to the input shaft 25a. The axis of the input shaft 25a is aligned with the axis of the input shaft 23. A forward clutch 25c and a reverse clutch 25d are provided on the input shaft 25a. A forward gear mechanism 25e is provided between the forward clutch 25c and the output shaft 25b. A reverse gear mechanism 25f is provided between the reverse clutch 25d and the output shaft 25b.

[0050] In the forward / reverse switching device 25, the outputs of the low-speed clutch 100C and the high-speed clutch 110C are input to the input shaft 25a. When the forward clutch 25c is switched on, the power of the input shaft 25a is switched to forward power by the forward gear mechanism 25e and the forward clutch 25c, transmitted to the output shaft 25b, and output from the output shaft 25b. When the reverse clutch 25d is switched on, the power of the input shaft 25a is switched to reverse power by the reverse gear mechanism 25f and the reverse clutch 25d, transmitted to the output shaft 25b, and output from the output shaft 25b.

[0051] As shown in Fig. 3, the auxiliary transmission 26 includes an input shaft 26a connected to the output shaft 25b of the forward / reverse switching device 25, and an output shaft 26b provided rearward of the input shaft 26a. The input shaft 26a and the output shaft 26b are positioned on the same axis. A high-speed clutch 26c is provided between the rear portion of the input shaft 26a and the front portion of the output shaft 26b. A low-speed gear mechanism 26f and a low-speed clutch 26d are provided between the input shaft 26a and the rear portion of the output shaft 26b.

[0052] In the auxiliary transmission 26, the output of the forward / reverse switching device 25 is input to the input shaft 26a. When the high-speed clutch 26c is switched to the engaged position, the power of the input shaft 26a is transmitted to the output shaft 26b via the high-speed clutch 26c without being changed in speed, and high-speed power is output from the output shaft 26b. When the low-speed clutch 26d is switched to the engaged position, the power of the input shaft 26a is changed in speed to low-speed power by the low-speed gear mechanism 26f and the low-speed clutch 26d, transmitted to the output shaft 26b, and output from the output shaft 26b. The low-speed power is slower than the high-speed power that is output when the high-speed clutch 26c is switched to the engaged position.

[0053] 3, the rear wheel differential mechanism 19 includes an input shaft 19a to which the output of the auxiliary transmission 26 is input. The input shaft 19a is connected to the rear portion of the output shaft 26b of the auxiliary transmission 26. The gear interlocking mechanism 27 is provided across the output shaft 26b of the auxiliary transmission 26 and the input shaft 20a of the front wheel transmission 20, and is configured to transmit the power of the output shaft 26b of the auxiliary transmission 26 to the input shaft 20a of the front wheel transmission 20.

[0054] As shown in Fig. 3, the front wheel transmission 20 includes an input shaft 20a connected to the gear interlocking mechanism 27, and an output shaft 20e arranged parallel to the input shaft 20a. A constant speed clutch 20b and an increasing speed clutch 20c are provided on the input shaft 20a. A constant speed gear mechanism 20d is provided between the constant speed clutch 20b and the output shaft 20e. A increasing speed gear mechanism 20f is provided between the increasing speed clutch 20c and the output shaft 20e.

[0055] In the front wheel transmission 20, the output of the auxiliary transmission 26 is transmitted to the input shaft 20a by the gear interlocking mechanism 27. When the constant speed clutch 20b is switched to the engaged position, the power of the input shaft 20a is changed to constant speed power by the constant speed clutch 20b and the constant speed gear mechanism 20d, transmitted to the output shaft 20e, and output from the output shaft 20e. The constant speed power is power that drives the front wheels 1 at the same speed as the rear wheels 2. When the speed-up clutch 20c is switched to the engaged position, the power of the input shaft 20a is changed to increased speed power by the speed-up clutch 20c and the speed-up gear mechanism 20f, transmitted to the output shaft 20e, and output from the output shaft 20e. The increased speed power is power that drives the front wheels 1 at a higher speed than the rear wheels 2. The power of the output shaft 20e of the front wheel transmission 20 is transmitted to the front wheel differential mechanism 39 via the rotating shaft 38.

[0056] In the traveling power transmission device 15, when the front wheels 1 and the rear wheels 2 are driven, the power of the engine 5 and the driving force of the second motor generator 18 are transmitted to the front wheels 1 and the rear wheels 2.

[0057] That is, the power of the input shaft 23 is transmitted to the internal gear 103 of the low-speed planetary transmission unit 100 via the first interlocking mechanism 126, and the driving force of the second motor generator 18 is transmitted to the sun gear 101 of the low-speed planetary transmission unit 100 via the output transmission mechanism 130 and the first input shaft 136, and the power from the engine 5 (engine power) and the driving force (motor power) of the second motor generator 18 are combined into a low-speed combined power by the low-speed planetary transmission unit 100, and the low-speed combined power is output to the low-speed clutch 100C. The power of the input shaft 23 is transmitted to the carrier 114 of the high-speed planetary transmission unit 110 via the second interlocking mechanism 127, the driving force of the second motor generator 18 is transmitted to the sun gear 111 of the high-speed planetary transmission unit 110 via the output transmission mechanism 130 and the second input shaft 137, the power from the engine 5 (engine power) and the driving force (motor power) of the second motor generator 18 are combined into a high-speed combined power by the high-speed planetary transmission unit 110, and the high-speed combined power is output to the high-speed clutch 110C. When the low-speed clutch 100C is switched to an engaged state (ON state) and the high-speed clutch 110C is switched to a disengaged state (OFF state), the low-speed combined power from the low-speed clutch 100C is transmitted to the auxiliary transmission unit 26 via the forward / reverse switching device 25, and then transmitted from the auxiliary transmission unit 26 to the rear wheel differential mechanism 19 and the front wheel transmission unit 20.

[0058] When the low-speed clutch 100C is switched to a disengaged state (off state) and the high-speed clutch 110C is switched to an engaged state (on state), the high-speed combined power from the high-speed clutch 110C is transmitted to the auxiliary transmission 26 via the forward / reverse switching device 25, and then transmitted from the auxiliary transmission 26 to the rear wheel differential mechanism 19 and the front wheel transmission 20 via the gear interlocking mechanism 27.

[0059] The second motor generator 18 mainly functions as an electric motor that drives the front wheels 1 and the rear wheels 2, but also functions as a generator during deceleration.

[0060] In the traveling power transmission device 15, when the front wheels 1 and the rear wheels 2 are driven, power from the engine 5 transmitted to the input shaft 23 is input to the first motor generator 17 by the input transmission mechanism 120, driving the first motor generator 17 to generate electricity. The generated electric power can be supplied to the second motor generator 18 for driving. The supply of electric power to the second motor generator 18 is performed either via the battery 22, with the generated electric power being charged into the battery 22, or without the battery 22, with the generated electric power not being charged into the battery 22.

[0061] As shown in FIG. 3 , a clutch 45 is provided between the output shaft 5b and the input shaft 23. The clutch 45 is configured to be switched between an engaged state (ON state) and a disengaged state (OFF state) by a hydraulic solenoid valve or the like. When switched to the engaged state, the clutch 45 transmits power from the engine 5 to the electric transmission unit 16A and the geared transmission unit 16B, switching the hybrid transmission 16 to a hybrid mode in which the front wheels 1 and the rear wheels 2 are driven by the power of the engine 5 and the driving force of the second motor generator 18 and electricity is generated by the first motor generator 17. When switched to the disengaged state, the clutch 45 cuts off the power transmission from the engine 5 to the electric transmission unit 16A and the geared transmission unit 16B, switching the hybrid transmission 16 to an electric mode in which the front wheels 1 and the rear wheels 2 are driven only by the driving force of the second motor generator 18. A dry clutch may be used as the clutch 45.

[0062] As shown in FIG. 3, a trochoid pump 81 is provided on the input shaft 23 to supply lubricating oil to the first motor generator 17, the second motor generator 18, and the gear transmission mechanism 30.

[0063] [Work power transmission device] 1 and 2, the power take-off shaft 12 is supported at the rear of the transmission case 13. As shown in Fig. 3, a work power transmission device 40 that transmits the power of the engine 5 to the power take-off shaft 12 is housed in the transmission case 13.

[0064] 3, the work power transmission device 40 is provided behind the input shaft 23 and extends in the fore-and-aft direction of the vehicle body, and includes a rotating shaft 41 whose front portion is connected to the input shaft 23, a work clutch 42 connected to the rear portion of the rotating shaft 41, and a power take-off shaft speed change device 43 that changes the speed of the output of the work clutch 42 and transmits it to the power take-off shaft 12. The axis of the rotating shaft 41 and the axis of the input shaft 23 are aligned on the same axis. The input shaft 23 and the rotating shaft 41 are interlocked and connected directly or via a joint.

[0065] In the work power transmission device 40, the power of the input shaft 23 is transmitted to the rotating shaft 41, and then transmitted from the rotating shaft 41 to the power take-off shaft 12 via the work clutch 42 and the power take-off shaft speed change device 43. The work clutch 42 switches between an ON state in which power from the engine 5 is transmitted to the power take-off shaft 12, and a OFF state in which power transmission from the engine 5 to the power take-off shaft 12 is cut off.

[0066] [Motor generators, inverter devices] 3, an inverter device 21 is connected to the first motor generator 17 and the second motor generator 18, and a battery 22 is connected to the inverter device 21. The inverter device 21 converts AC power from the first motor generator 17 into DC power and supplies it to the battery 22, and converts DC power from the battery 22 into AC power and supplies it to the second motor generator.

[0067] As shown in Figures 2, 4 and 5, the inverter device 21 is provided between the front wheels 1 and the rear wheels 2, and in a space located under the floor 11, on one side of the vehicle width direction relative to the transmission case 13. The inverter device 21 is accessible for maintenance from the lateral outside of the traveling vehicle body 3 through between the front wheels 1 and the rear wheels 2. NaIt is possible to do this.

[0068] 1 and 5, the reducing agent tank 54, which stores urea water as a reducing agent to be supplied to the exhaust gas treatment device 53, is provided in a space between the front wheels 1 and the rear wheels 2 and below the floor 11, at a location on the other side of the vehicle width direction relative to the transmission case 13. The reducing agent tank 54 is provided on the opposite side of the transmission case 13 from the side on which the inverter device 21 is located. As shown in FIGS. 1 and 5, a fuel tank 55 for the engine is provided on the same side of the transmission case 13 as the side on which the reducing agent tank 54 is located. The weight of the inverter device 21, the weight of the urea water stored in the reducing agent tank 54, and the weight of the fuel stored in the fuel tank 55 are both divided and applied to both sides of the transmission case 13 on the vehicle body.

[0069] In this embodiment, the inverter device 21 is provided at a location located on the right side of the vehicle body with respect to the transmission case 13, and the reducing agent tank 54 and the fuel tank 55 are provided at locations located on the left side of the vehicle body with respect to the transmission case 13. However, this is not limiting, and the inverter device 21 may be provided at a location located on the left side of the vehicle body with respect to the transmission case 13, and the reducing agent tank 54 and the fuel tank 55 may be provided at locations located on the right side of the vehicle body with respect to the transmission case 13.

[0070] 5, the inverter device 21 is supported by a support member 56 provided between the transmission case 13 and the inverter device 21. The inverter device 21 is supported by the transmission case 13, which has high rigidity, via the support member 56.

[0071] 2, 4, and 5, the inverter device 21 is provided at a location located inside the upper step 50a for getting on and off in the vehicle width direction. The inverter device 21 is protected from the lateral outside by the upper step 50a for getting on and off.

[0072] The inverter device 21 and a cooling device 57 that cools the inverter device 21 are arranged side by side in the vertical direction of the vehicle body. In this embodiment, as shown in Figures 2, 4, and 5, the cooling device 57 is located below the inverter device 21, but the cooling device 57 may also be located above the inverter device 21. As shown in Figure 5, the cooling device 57 is supported by a support member 58 that is provided across the cooling device 57 and the lower part of the transmission case 13, and the cooling device 57 is supported on the transmission case 13 via the support member 58.

[0073] 4 and 5, the cooling device 57 includes a radiator 57a that cools the cooling water, a pump 57b that circulates the cooling water between the radiator 57a and a cooling section provided in the inverter device 21, and a cooling water tank 57c that stores the cooling water. In this embodiment, an electric pump is used as the pump 57b. The cooling water tank 57c and the pump 57b are arranged in a direction along the fore-and-aft direction of the vehicle body. The pump 57b and the radiator 57a are arranged in a direction along the lateral width direction of the vehicle body. The radiator 57a is located more inward in the lateral width direction of the vehicle body than the pump 57b.

[0074] [Another embodiment] (1) Fig. 6 is a side view showing an installation structure of the inverter device 21 according to another embodiment. In the installation structure of the inverter device 21 according to another embodiment, as shown in Fig. 6, the inverter device 21 is supported by a support member 59 provided across the inverter device 21 and the lower frame 10c of the driver's cabin 10, and the inverter device 21 is supported by the driver's cabin 10 via the support member 59. The support member 59 includes a support base 59a on which the inverter device 21 is placed, and a support arm 59b that extends from the lower frame 10c toward the support base 59a and suspends and supports the support base 59a. Vibrations transmitted from the vehicle body frame 4 to the inverter device 21 are damped by the front buffer material 10a and the rear buffer material 10b.

[0075] (2) Fig. 7 is a side view showing an installation structure of the inverter device 21 according to another embodiment. In the installation structure of the inverter device 21 according to another embodiment, the inverter device 21 and the battery 22 are arranged in the vertical direction of the vehicle body. In this embodiment, the battery 22 is provided below the inverter device 21, but it is also possible to provide the battery 22 above the inverter device 21.

[0076] (3) In the above embodiment, an example was shown in which a hybrid transmission 16 was provided, but this is not limited to this. The vehicle may not have an engine, but may have a transmission that transmits only the driving force of the electric motor to the rear wheels 2.

[0077] (4) In the above embodiment, a configuration is shown in which driving force is transmitted to both the front wheels 1 and the rear wheels 2, but it is also possible to transmit driving force only to the rear wheels 2 without transmitting driving force to the front wheels 1.

[0078] (5) In the above embodiment, the first motor generator 17 and the second motor generator 18 are arranged in the fore-and-aft direction of the vehicle body, but this is not limited thereto, and the first motor generator 17 and the second motor generator 18 may be arranged in the width direction of the vehicle body or in the up-and-down direction of the vehicle body.

[0079] (6) In the above embodiment, the step 50a for getting on and off serves as a guard member for the inverter device 21. However, the step for getting on and off may not be located on the outer side of the inverter device 21 on the vehicle body side.

[0080] (7) In the above embodiment, the inverter device 21 and the cooling device 57 are arranged vertically. However, the inverter device 21 and the cooling device 57 may not be arranged vertically.

[0081] (8) In the above embodiment, the inverter device 21 and the battery 22 are arranged vertically. However, the inverter device 21 and the battery 22 may not be arranged vertically.

[0082] (9) In the above embodiment, an example was shown in which the driver's cabin 10 was provided, but the driver's cabin 10 may not be provided. [Industrial Applicability]

[0083] The present invention can be applied to a work vehicle equipped with a transmission that transmits the driving force of an electric motor to a rear traveling device. [Explanation of symbols]

[0084] 1 front wheel 2 Rear wheels (rear running gear) 3 Running vehicle 4 Body frame 5 Engine 9 Driving Department 10 Driver's Cabin 10a Front buffer material (buffer material) 10b Rear buffer material (buffer material) 11 Floor 16 Transmission (Hybrid Transmission) 17 Electric motor (first motor generator) 18 Electric motor (second motor generator) 21 Inverter device 22 Battery 53 Exhaust gas treatment equipment 54 Reductant tank 56 Support member 57 Cooling device 57a Radiator 57b Pump 57c Cooling water tank 59 Support member

Claims

1. A running body supported by front wheels and a rear running device is provided, The traveling vehicle body is provided with a driving section having a floor section for riding, a transmission that outputs toward the rear traveling device, a transmission case in which the transmission is housed, an electric motor connected to the transmission, and an inverter device connected to the electric motor, the inverter device is provided in a space between the front wheels and the rear traveling device and below the floor, at a location located laterally of the transmission case, a cooling device for cooling the inverter device and the inverter device are arranged in the vertical direction of the vehicle body; The cooling device of the work vehicle includes a radiator that cools the cooling water, a pump that circulates the cooling water between the radiator and the inverter device, and a cooling water tank that stores the cooling water.

2. A running body supported by front wheels and a rear running device is provided, The traveling vehicle body is provided with a driving section having a floor section for riding, an engine, a hybrid transmission having a motor generator and changing the speed of the driving force of the engine to output it toward the rear traveling device, a transmission case in which the hybrid transmission is housed, an exhaust gas treatment device that purifies the exhaust of the engine, a reducing agent tank that stores a reducing agent to be supplied to the exhaust gas treatment device, and an inverter device connected to the motor generator, the inverter device is provided in a space between the front wheels and the rear traveling device and below the floor, at a location that is located on one side in the vehicle body width direction with respect to the transmission case, the reducing agent tank is provided in a space between the front wheels and the rear traveling device and below the floor, at a location that is located on the other side in the vehicle body width direction with respect to the transmission case, a cooling device for cooling the inverter device and the inverter device are arranged in the vertical direction of the vehicle body; The cooling device of the work vehicle includes a radiator that cools the cooling water, a pump that circulates the cooling water between the radiator and the inverter device, and a cooling water tank that stores the cooling water.

3. Steps for getting on and off are provided on the outer lateral sides of the driving section, 3. The work vehicle according to claim 1, wherein the inverter device is provided at a location located inside the boarding / exiting step in the vehicle width direction.

4. 3. The work vehicle according to claim 1, wherein the cooling device is located below the inverter device.

5. 3. The work vehicle according to claim 1, wherein the inverter device and the battery to which the inverter device is connected are arranged in a vertical direction of the vehicle body.

6. 6. The work vehicle according to claim 5, wherein the battery is located above the inverter device.

7. 3. The work vehicle according to claim 1, further comprising a support member disposed across the transmission case and the inverter device to support the inverter device.

8. A driver's cabin is provided which is supported on the vehicle body frame via a buffer material, 3. The work vehicle according to claim 1, further comprising a support member disposed between the driver's cabin and the inverter device, for supporting the inverter device.

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