Work vehicle

Abstract

To inhibit increase in size of a work vehicle including a fuel battery.SOLUTION: A work vehicle comprises: a motor; a work device configured to be operated by power of the motor; a vehicle body having a support supporting a transmission shaft which transmits power from the motor to the work device, and a pair of vertical frames which are connected to the front side of the support and disposed spaced apart from each other in a vehicle width direction; an electric device including a battery unit which accumulates electric power supplied to the motor; a fuel battery which is provided on the upper side of the pair of vertical frames and generates electric power accumulated in the battery unit; an auxiliary machine added to the fuel battery; and an engine hood which covers the fuel battery. At least one of the electric device and the auxiliary machine is disposed between the pair of vertical frames.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present disclosure relates to a work vehicle.

Background Art

[0002] Patent Document 1 discloses a work vehicle including a motor, a battery, and a fuel cell disposed in a bonnet. The fuel cell generates electric power stored in the battery using hydrogen gas. The motor rotates with the electric power of the battery. The work vehicle travels using the rotational force of the motor as a driving force.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The above work vehicle includes a number of devices including auxiliary devices associated with the fuel cell. For this reason, when these devices are mounted on the vehicle, there is a problem that the entire work vehicle becomes larger.

[0005] An object of the present disclosure is to suppress the enlargement of a work vehicle including a fuel cell.

Means for Solving the Problems

[0006] The work vehicle of the present disclosure includes a motor, a work device that operates by the power of the motor, a support that supports a transmission shaft for transmitting power from the motor to the work device, and a pair of vertical frames that are connected to the front side of the support and are spaced apart from each other in the vehicle width direction, a vehicle body having the same, an electrical equipment including a battery unit that stores electric power supplied to the motor, a fuel cell that is provided above the pair of vertical frames and generates electric power stored in the battery unit, auxiliary equipment associated with the fuel cell, and a bonnet that covers the fuel cell, and at least one of the electrical equipment and the auxiliary equipment is disposed between the pair of vertical frames.

Advantages of the Invention

[0007] According to the present disclosure, it is possible to suppress an increase in the size of a work vehicle equipped with a fuel cell.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0009] <Summary of Embodiments of the Present Disclosure> The summary of the embodiments of the present disclosure will be listed and described below. (1) The work vehicle according to the embodiment includes a motor, a work device that operates by the power of the motor, a support that supports a transmission shaft that transmits power from the motor to the work device, and a pair of vertical frames that are connected to the front side of the support and are spaced apart from each other in the vehicle width direction, a vehicle body having, an electrical equipment including a battery unit that stores electric power supplied to the motor, a fuel cell provided on the upper side of the pair of vertical frames that generates electric power stored in the battery unit, auxiliary equipment associated with the fuel cell, and a bonnet that covers the fuel cell, and at least one of the electrical equipment and the auxiliary equipment is disposed between the pair of vertical frames.

[0010] According to the above work vehicle, the space between the pair of vertical frames where the fuel cell is provided on the upper side of the vehicle body can be effectively utilized as a space where at least one of the electrical equipment and the auxiliary equipment is disposed. Thereby, the enlargement of the work vehicle equipped with the fuel cell can be suppressed.

[0011] (2) In the work vehicle according to (1) above, it is preferable that the at least one device is disposed between the pair of vertical frames and below the fuel cell. In this case, the space between the pair of vertical frames and below the fuel cell can be effectively utilized as a space where at least one of the electrical equipment and the auxiliary equipment is disposed.

[0012] (3) In the work vehicle according to (1) or (2) above, the electrical equipment includes the battery unit, an inverter that converts direct current power into alternating current power and outputs it to the motor, and a voltage converter that steps down the power input from the battery unit, and the at least one device disposed between the pair of vertical frames is preferably any one of the battery unit, the inverter, and the voltage converter.

[0013] In this case, since any one of the battery unit, the inverter, and the voltage converter, which are electrical equipment, is arranged between the pair of vertical frames, the space between the pair of vertical frames can be effectively utilized as a space where the electrical equipment is arranged. Further, when the inverter is arranged between the pair of vertical frames, the wiring length between the fuel cell and the inverter can be shortened. Further, when the battery unit and the voltage converter are arranged between the pair of vertical frames, the wiring length between the battery unit and the voltage converter can be shortened.

[0014] (4) In the work vehicle according to the above (1) or (2), the auxiliary equipment includes a radiator for cooling the coolant, a fan for supplying an air flow to the radiator, an air cleaner for cleaning the air supplied to the fuel cell, an ion exchanger for removing ions from the coolant, and a hydrogen detector for detecting hydrogen leaked from the hydrogen supply passage to the fuel cell. It is preferable that the at least one device arranged between the pair of vertical frames is any one of the radiator, the fan, the air cleaner, the ion exchanger, and the hydrogen detector.

[0015] In this case, since any one of the radiator, the fan, the air cleaner, the ion exchanger, and the hydrogen detector, which are auxiliary equipment, is arranged between the pair of vertical frames, the space between the pair of vertical frames can be effectively utilized as a space where the auxiliary equipment is arranged. Further, when the air cleaner is arranged between the pair of vertical frames, the air flow path length between the air cleaner and the fuel cell can be shortened. Further, when the ion exchanger is arranged between the pair of vertical frames 321, the coolant flow path length between the ion exchanger and the fuel cell can be shortened.

[0016] <Details of the Embodiment> Hereinafter, preferred embodiments will be described with reference to the drawings. 〔Overall Configuration of the Work Vehicle〕 FIG. 1 is a perspective view showing an embodiment of the work vehicle of the present disclosure. FIGS. 2 to 6 are a front view, a rear view, a side view (right side view), a side view (left side view), and a plan view of the work vehicle shown in FIG. 1. The work vehicle 10 of the present embodiment is a vehicle that can be used for agricultural work, and the work vehicle 10 shown in FIG. 1 is a tractor. The work vehicle is not limited to a tractor. For example, the work vehicle according to the present disclosure may be an agricultural machine, a construction machine, a utility vehicle, etc. other than a tractor.

[0017] The directions of the work vehicle 10 of the present disclosure are defined. The direction in which the work vehicle 10 moves forward is defined as the front, the direction in which the work vehicle 10 moves backward is defined as the rear, the left side when the work vehicle 10 faces forward is defined as the left, and the right side when the work vehicle 10 faces forward is defined as the right. The front-rear direction of the work vehicle 10 is defined as the vehicle front-rear direction. The left-right direction orthogonal to the vehicle front-rear direction is defined as the vehicle width direction. The direction orthogonal to both the vehicle front-rear direction and the vehicle width direction is defined as the vertical direction. The vertical direction is also called the height direction. In each figure, an orthogonal three-dimensional coordinate is shown, the front direction is indicated by arrow X1, and the rear direction is indicated by arrow X2. The left direction is indicated by arrow Y1, and the right direction is indicated by arrow Y2. The upper direction is indicated by arrow Z1, and the lower direction is indicated by arrow Z2.

[0018] The work vehicle 10 shown in FIG. 1 includes a vehicle body 11, a traveling device 12 that supports the vehicle body 11 so as to be travelable, a driver's seat 15, a cabin 16, a tank unit 21, a fuel cell (fuel cell module) 24, a battery unit 30, and an electric motor 31. The tank unit 21 has a tank 13 that stores fuel. The fuel is a liquid or a gas, and for example, is hydrogen, methane, carbon monoxide (CO), etc. In the present embodiment, the tank 13 stores hydrogen gas.

[0019] The work vehicle 10 of this embodiment is a fuel cell vehicle (FCV; Fuel Cell Vehicle), and runs using the electric power generated by the fuel cell 24 using hydrogen and oxygen. The fuel cell 24 generates electric power to be stored in the battery unit 30. The fuel cell 24 may generate electric power using methane or carbon monoxide (CO) as fuel. The electric power stored in the battery unit 30 is supplied to the motor 31.

[0020] The work vehicle 10 includes a pipe for hydrogen gas (hydrogen pipe) 22 and a filling part 25 (see FIG. 3). The filling part 25 has a filling port (receptacle) 26 for connecting a filling nozzle of a hydrogen gas supply machine (not shown) separate from the work vehicle 10. Hydrogen gas is supplied from the filling port 26 and supplied to the tank 13 through the pipe 22 (rear pipe 22r). The hydrogen gas in the tank 13 is supplied to the fuel cell 24 through the pipe 22 (front pipe 22f).

[0021] The work vehicle 10 (see FIG. 1) includes a mounting frame 17. The mounting frame 17 is a frame for mounting the tank unit 21 (tank 13) on the vehicle body 11. The specific configuration of the mounting frame 17 will be described later.

[0022] 〔Vehicle body〕 The vehicle body 11 has a chassis 41, a bonnet 34, a cover 111, and a fender 47. The fender 47 covers the rear wheel 122 from above. The chassis 41 supports the traveling device 12, the cabin 16, the fuel cell 24, the battery unit 30, and the motor 31. FIG. 7 is a perspective view showing a part of the work vehicle 10 shown in FIG. 1 disassembled. The chassis 41 is located at the center in the vehicle width direction and has a long shape in the vehicle longitudinal direction. The chassis 41 has a front frame 32 that constitutes the front part of the chassis 41 and a transmission case (support) 33 that constitutes the rear part of the chassis 41.

[0023] The front frame 32 is composed by combining a metal frame material or the like. The front frame 32 of the present embodiment has a pair of vertical frames 321, a first horizontal frame 322, a second horizontal frame 323, and a third horizontal frame 324. The pair of vertical frames 321 are connected to the front side of the transmission case 33. The pair of vertical frames 321 are arranged spaced apart from each other in the vehicle width direction and extend in the vehicle longitudinal direction.

[0024] The first horizontal frame 322 is fixed to the rear part of the pair of vertical frames 321 behind the front wheels 121. A motor 31 is mounted on the rear part of the pair of vertical frames 321 and on the first horizontal frame 322. The second horizontal frame 323 is fixed to the front part of the pair of vertical frames 321 in front of the front wheels 121. Both ends in the vehicle width direction of the first horizontal frame 322 and the second horizontal frame 323 extend outward in the vehicle width direction from the pair of vertical frames 321. The third horizontal frame 324 connects the front ends of the pair of vertical frames 321. The dimension of the third horizontal frame 324 in the vehicle width direction is the same as the dimension of the pair of vertical frames 321 in the vehicle width direction.

[0025] The transmission case 33 is composed of a metal box body. The transmission case 33 is connected to the rear side of the front frame 32, and the transmission case 33 and the front frame 32 form the skeleton of the vehicle body 11. The transmission case 33 has a power transmission mechanism such as a transmission, a clutch, and a differential gear inside. The power transmission mechanism decelerates or accelerates the rotation of the output shaft of the motor 31 and outputs it to the traveling device 12 (one or both of the front wheels 121 and the rear wheels 122).

[0026] The power transmission mechanism outputs a part of the power of the motor 31 to a PTO shaft (transmission shaft) 334 (see FIG. 3). The PTO shaft 334 is an output shaft supported at the rear part of the transmission case 33. The work vehicle 10 includes a work device 340 (see FIG. 5) and a coupling device 43 for coupling the work device 340 behind the vehicle body 11. The PTO shaft 334 transmits the power of the motor 31 to the work device 340 coupled to the coupling device 43. The work device 340 operates by the power of the motor 31. The work device 340 is, for example, a tiller. In FIGS. 1 to 4, FIGS. 6 to 8, the illustration of the work device 340 is omitted.

[0027] FIG. 8 is a right side view of the work vehicle 10, showing a state in which a part of the bonnet 34, the cover 111, and the tank case 211 of the tank unit 21 is removed. In order from the front of the vehicle, the first radiator 48, the fuel cell 24, and the second radiator 49 are arranged in this order and mounted on the front frame 32 of the chassis 41. As shown in FIGS. 4 and 8, the bonnet 34 and the cover 111 cover the mounted items located closer to the front of the vehicle body 11. The bonnet 34 covers the fuel cell 24 and the first radiator 48 from above and from both sides in the vehicle width direction. The cover 111 covers the second radiator 49 located behind the fuel cell 24 from above and from both sides in the vehicle width direction.

[0028] The upper surface 111a of the cover 111 is higher than the upper surface 34a of the bonnet 34, but lower than the upper end of the steering wheel 151 that an operator sitting on the driver's seat 15 operates for steering. The upper surface 34a of the bonnet 34 becomes lower as it goes forward. Therefore, it is difficult for the operator sitting on the driver's seat 15 to have the view obstructed.

[0029] 〔Driver's Seat and Cabin〕 The driver's seat 15 and the cabin 16 are provided on the chassis 41 at a position closer to the rear (see FIG. 1). The cabin 16 has the driver's seat 15 and the steering wheel 151 inside. The cabin 16 has a front pillar 162 located in front of the driver's seat 15, a rear pillar 163 located behind the driver's seat 15, and a roof 164 located above the driver's seat 15. The front pillar 162 is provided at the left front and right front of the driver's seat 15. The rear pillar 163 is provided at the left rear and right rear of the driver's seat 15. The roof 164 is supported by the front pillar 162 and the rear pillar 163.

[0030] The cabin 16 has a transparent front glass 165 located in front of the driver's seat 15 and transparent side glasses 166 located on both the left and right sides of the driver's seat 15. The front glass 165 is provided between the left and right front pillars 162. The side glass 166 is provided between the front pillar 162 and the rear pillar 163. The side glass 166 is openable and functions as a door for an operator to enter and exit the cabin 16.

[0031] A step 167 is provided on one side (left side) in the vehicle width direction of the cabin 16 (see FIG. 5). The step 167 is a member for an operator getting on and off the cabin 16 to step on. In front of the cabin 16, a cover 111 and a bonnet 34 are provided. As shown in FIGS. 2 and 6, the vehicle width direction dimensions of each of the cover 111 and the bonnet 34 are smaller than the vehicle width direction dimension of the cabin 16. The vehicle width direction dimension of the bonnet 34 is smaller than the vehicle width direction dimension of the cover 111.

[0032] The work vehicle 10 of the present embodiment includes a cabin 16, but may not include the cabin 16. The work vehicle 10 may be provided with a canopy or a rollover protective structure (ROPS) instead of the cabin 16. When the work vehicle 10 does not include the cabin 16, the tank unit 21 is mounted on the mounting frame 17 and is located above the driver's seat 15.

[0033] 〔Traveling device〕 As shown in FIGS. 6 and 7, the traveling device 12 has front wheels 121 and rear wheels 122. The front wheels 121 are provided on the left and right sides of the front portion of the vehicle body 11. The left and right front wheels 121 are rotatably supported at both ends of an axle 123 extending in the vehicle width direction. The axle 123 is disposed below a pair of vertical frames 321 of the vehicle body 11 and is supported by the pair of vertical frames 321. The rear wheels 122 are provided on the left and right sides of the rear portion of the vehicle body 11. The maximum dimension in the vehicle width direction of the left and right rear wheels 122 is larger than the maximum dimension in the vehicle width direction of the left and right front wheels 121. The maximum dimension in the vehicle width direction of the left and right rear wheels 122 becomes the maximum vehicle width dimension of the work vehicle 10. One or both of the front wheels 121 and the rear wheels 122 rotate by the power of the motor 31. One or both (drive wheels) of the front wheels 121 and the rear wheels 122 that rotate by the power of the motor 31 may be crawlers (endless tracks).

[0034] As shown in FIG. 8, the fuel cell 24 is provided above a pair of vertical frames 321 between a first cross frame 322 and a second cross frame 323 in the front frame 32 of the chassis 41. The motor 31 is located behind the fuel cell 24 and below the second radiator 49. The motor 31 has a rotating rotor and a stator having a plurality of coils. The output shaft of the motor 31 is connected to a power transmission mechanism in the transmission case 33 (see FIG. 7). The battery unit 30 is located below the fuel cell 24. Details thereof will be described later.

[0035] The fuel cell 24 generates electricity using hydrogen gas supplied from the battery unit 30 as fuel and obtains electric power for rotating the motor 31. The fuel cell 24 has a substantially rectangular box-shaped battery casing 241 and a fuel cell stack 242 provided inside the battery casing 241. The fuel cell stack 242 has a plurality of battery cells. The battery cell has a positive electrode and a negative electrode. The plurality of battery cells are in a stacked state. The electric power generated by each battery cell is aggregated and output to the battery unit 30.

[0036] 〔Tank Unit〕 The tank unit 21 (see Fig. 8) includes a tank 13, a tank case 211 that houses the tank 13, and a valve unit 212. The tank 13 is a substantially cylindrical high-pressure container. The tank 13 is made of a fiber-reinforced resin or the like reinforced with carbon fiber or glass fiber. In the case of this embodiment, three tanks 13 are fixed to the tank case 211 with the axial direction of their cylindrical portions parallel to the vehicle width direction. The number of tanks 13 is not limited to three.

[0037] The tank case 211 is a box that can accommodate one or more tanks 13. The tank case 211 has an opening / closing door 213 (see Fig. 1) on one or both sides in the vehicle width direction and opens in the vehicle width direction. The tank case 211 is installed above the roof 164 with a vertical interval from the roof 164. The tank case 211 is fixed to the upper frame portion 171 of the mounting frame 17. The tank case 211 is made of metal such as aluminum or steel and protects the tank 13 from external thermal and physical influences.

[0038] The tank 13 is arranged above the cabin 16 (driver's seat 15). Therefore, the degree of freedom in arranging the fuel cell 24, the filling portion 25, the motor 31, and the battery unit 30 in the vehicle body 11 is high. When retrofitting a work vehicle with a conventional internal combustion engine into a work vehicle 10 having a fuel cell 24 and a motor 31 as in this embodiment, it is not necessary to significantly change the arrangement configuration of each device.

[0039] The tank 13 is connected to the rear pipe 22r and the front pipe 22f via a valve unit 212 (see FIG. 8). The rear pipe 22r (see FIG. 3) is a gas introduction pipeline connecting the hydrogen gas filling port 26 and the valve unit 212, and guides the hydrogen gas introduced into the filling port 26 to the tank 13. The front pipe 22f (see FIG. 1) is a gas outlet pipeline connecting the fuel cell 24 and the valve unit 212, and guides the hydrogen gas stored in the tank 13 to the fuel cell 24. The tank 13 stores the hydrogen gas introduced from outside the vehicle through the filling port 26 and supplies it to the fuel cell 24. The valve unit 212 has an on-off valve, a pressure reducing valve, etc., adjusts the hydrogen gas stored in the tank 13 to a predetermined flow rate, and leads it out to the fuel cell 24 through the front pipe 22f.

[0040] 〔Mounting Frame〕 As shown in FIGS. 1 and 7, the mounting frame 17 is a frame structure for mounting the tank 13 on the vehicle body 11. The mounting frame 17 of the present embodiment has an upper frame portion 171, a pair of front frame portions 172, a rear frame portion 173, and a pair of reinforcing frame portions 175. The upper frame portion 171 is formed in a rectangular frame shape and is located above the cabin 16. A tank case 211 is attached to the upper frame portion 171. That is, the upper frame portion 171 supports the tank 13 via the tank case 211. The upper frame portion 171 is supported by the front frame portion 172, the rear frame portion 173, and the reinforcing frame portion 175.

[0041] The pair of front frame portions 172 extend in the vertical direction in front of the cabin 16 and on the outer side in the vehicle width direction of the vehicle body 11. The upper ends of the pair of front frame portions 172 are respectively fixed to the left and right corner portions on the front side of the upper frame portion 171. The lower ends of the pair of front frame portions 172 are respectively fixed to both ends in the vehicle width direction of the first transverse frame 322 of the chassis 41. The rear frame portion 173 is located behind the cabin 16. The rear frame portion 173 is configured in a lattice shape by a plurality of frame members. The upper end of the rear frame portion 173 is fixed to the left and right corner portions on the rear side of the upper frame portion 171, respectively. The lower end of the rear frame portion 173 is fixed to the chassis 41. A filling portion 25 is provided in the rear frame portion 173 (see FIG. 3).

[0042] The pair of reinforcing frame portions 175 are reinforcing members for receiving the inertial force that the upper frame portion 171 and the tank case 211 tend to move forward when the work vehicle 10 in operation stops. The pair of reinforcing frame portions 175 are located in front of the front frame portion 172 and on both sides in the vehicle width direction of the bonnet 34. The upper ends of the pair of reinforcing frame portions 175 are fixed to the left and right corner portions on the front side of the upper frame portion 171, respectively. The lower ends of the pair of reinforcing frame portions 175 are fixed to both ends in the vehicle width direction of the second cross frame 323 of the chassis 41, respectively (see FIG. 2).

[0043] 〔Electrical equipment〕 FIG. 9 is a schematic bottom view of the front portion of the work vehicle 10 shown in FIG. 1 as viewed from below. In FIG. 9, the illustration of the bonnet 34 and the cover 111 is omitted. The work vehicle 10 includes electrical equipment 80 disposed on the front frame 32 of the chassis 41. The electrical equipment 80 includes a battery unit 30, an inverter 81, a first voltage converter 82, and a second voltage converter 83. These devices 30, 81 to 83 are attached to a pair of vertical frames 321 of the front frame 32.

[0044] The battery unit 30 stores electric power supplied to the motor 31. The battery unit 30 has a battery (battery pack) 300 and a battery housing 301 that houses the battery 300. The battery 300 temporarily stores the electric power generated by the fuel cell 24 and outputs the stored electric power to electrical components such as the motor 31. The battery 300 is composed of a plurality of battery cells. The battery 300 is a charge-discharge type secondary battery such as a lithium-ion battery or a lead-acid battery. The battery housing 301 has a rectangular parallelepiped shape that is long in the vehicle front-rear direction.

[0045] The inverter 81 is connected to the battery unit 30 through a junction box (not shown). Further, the fuel cell 24 is connected to the inverter 81 via a boost circuit (not shown). The inverter 81 is electrically connected to the motor 31. The inverter 81 converts the DC power output from the boost circuit into AC power and outputs the AC power to the motor 31.

[0046] The first voltage converter 82 and the second voltage converter 83 constitute a step-down circuit that steps down the power input from the battery unit 30. The first voltage converter 82 is, for example, a 12V DC / DC converter. The second voltage converter 83 is, for example, a 24V DC / DC converter. The battery unit 30 is connected to the first voltage converter 82 and the second voltage converter 83 respectively through the junction box.

[0047] The work vehicle 10 is equipped with electrical components with a low voltage that operate at a voltage lower than that of the motor 31. In the case of this embodiment, the electrical components with a low voltage are the radiators 48, 49, and an air conditioner (not shown) described later. The electrical components with a low voltage are supplied with the power stepped down by a step-down circuit (voltage converters 82, 83 or a 12V battery) through the junction box.

[0048] 〔Auxiliary equipment〕 The work vehicle 10 is equipped with auxiliary equipment 90 associated with the fuel cell 24. The auxiliary equipment 90 is arranged on the front frame 32 of the chassis 41. The auxiliary equipment 90 includes a first radiator 48, a second radiator 49, a first fan 51, a second fan 52, an air cleaner 91, an ion exchanger 92, and a hydrogen sensor (hydrogen detection unit) 93. The air cleaner 91, the ion exchanger 92, and the hydrogen sensor 93 are attached to the lower surface of the battery housing 301 of the battery unit 30.

[0049] The first radiator 48 and the second radiator 49 are configured as part of a cooling system that cools the fuel cell 24, the motor 31, the inverter 81, and the voltage converters 82 and 83 with a coolant. As shown in FIGS. 8 and 9, the first radiator 48 is located in front of the fuel cell 24. The second radiator 49 is located behind the fuel cell 24.

[0050] Most of the first radiator 48, except for its lower end portion 48a, is disposed above a pair of vertical frames 321 of the front frame 32 and is attached to the pair of vertical frames 321. The first radiator 48 is a radiator for cooling devices other than the fuel cell 24. The first radiator 48 is connected to electrical components (heat generating components) such as the motor 31, the inverter 81, and the voltage converters 82 and 83 that require cooling via a first cooling flow path (not shown) having a circulation pump. The first radiator 48 cools the coolant supplied through the first cooling flow path by heat exchange with the outside air.

[0051] The entire second radiator 49 is disposed above a pair of vertical frames 321 and is attached to the pair of vertical frames 321. The second radiator 49 is a radiator for cooling the fuel cell 24. The second radiator 49 is connected to the fuel cell 24 via a second cooling flow path (not shown) having a circulation pump. The second radiator 49 cools the coolant supplied through the second cooling flow path by heat exchange with the outside air. Note that the first radiator 48 may cool the fuel cell 24 and the second radiator 49 may cool devices other than the fuel cell 24.

[0052] The first fan 51 is located in front of the first radiator 48 and is attached to the first radiator 48. Most of the first fan 51, except for its lower end portion 51a, is disposed above a pair of vertical frames 321 of the front frame 32. The first fan 51 supplies an air flow to the first radiator 48 by rotating, thereby promoting heat exchange with the coolant.

[0053] The second fan 52 is located behind the second radiator 49 and is attached to the second radiator 49. The entire second fan 52 is disposed above a pair of vertical frames 321 of the front frame 32. By rotating, the second fan 52 supplies an air flow to the second radiator 49, promoting heat exchange with the coolant.

[0054] The air cleaner 91 purifies the air supplied to the fuel cell 24. Although not shown, the air cleaner 91 has an intake port for taking in outside air and an exhaust port for discharging the air purified inside. The exhaust port of the air cleaner 91 is connected to the fuel cell 24 via a pipe (not shown) such as a hose.

[0055] The ion exchanger 92 is provided in the middle of the second cooling flow path connecting the fuel cell 24 and the second radiator 49. The ion exchanger 92 is composed of a filter or the like. The ion exchanger 92 removes ions from the coolant flowing through the second cooling flow path. The ions are eluted, for example, from the pipes of the second cooling flow path. The work vehicle 10 can ensure the insulation of the coolant flowing through the second cooling flow path by removing ions from the coolant by the ion exchanger 92. Note that the ion exchanger 92 may remove ions from the coolant in the first cooling flow path.

[0056] The hydrogen sensor 93 detects hydrogen leaking from the supply flow path that supplies hydrogen from the tank 13 to the fuel cell 24. In the case of this embodiment, the supply flow path is the front pipe 22f described above (see also FIG. 1). The hydrogen sensor 93 is disposed, for example, near the connection portion between the front pipe 22f and the fuel cell 24. The work vehicle 10 can detect hydrogen leaking from the front pipe 22f by the hydrogen sensor 93.

[0057] 〔Arrangement of Electrical Equipment and Auxiliary Equipment〕 As shown in FIGS. 8 and 9, most of the electrical equipment 80 and auxiliary equipment 90 are arranged between a pair of vertical frames 321 in the front frame 32. In the present embodiment, the equipment 30, 81 to 83 of the electrical equipment 80 and the equipment 48, 51, 91 to 93 of the auxiliary equipment 90 are arranged between the pair of vertical frames 321. Here, "arranged between the vertical frames 321" means not only the case where the whole of one piece of equipment is arranged, but also the case where a part of one piece of equipment is arranged.

[0058] Among the above-mentioned equipment arranged between the pair of vertical frames 321, the whole of each of the equipment 30, 81 to 83 of the electrical equipment 80 and the whole of each of the equipment 91 to 93 of the auxiliary equipment 90 are arranged in a lower space 35 formed below the fuel cell 24 between the pair of vertical frames 321. In the present embodiment, the battery unit 30 is arranged in the lower space 35 so as to straddle the axle 123 from above and is arranged biased toward the front side.

[0059] The first voltage converter 82 and the second voltage converter 83 are arranged in the lower space 35 close to the rear of the battery unit 30 and are arranged side by side in the vehicle width direction. The inverter 81 is arranged in the lower space 35 close to the rear of the first voltage converter 82 and the second voltage converter 83. The inverter 81, the first voltage converter 82, and the second voltage converter 83 each extend in the vehicle width direction.

[0060] Note that the arrangement of each of the equipment 30, 81 to 83 of the electrical equipment 80 is not limited to the present embodiment. For example, a part or the whole of each of the equipment 30, 81 to 83 may be arranged in another space 36 (described later) behind the lower space 35 or in another space 36 in front of the lower space 35 between the pair of vertical frames 321. Also, at least one of all the equipment 30, 81, 82, 83 of the electrical equipment 80 may be arranged between the pair of vertical frames 321.

[0061] The first radiator 48 and the first fan 51 of the auxiliary equipment 90 are arranged in the other space 36 other than below the fuel cell 24 between the pair of vertical frames 321. In the present embodiment, the lower end portions 48a and 51a, which are each a part of the first radiator 48 and the first fan 51, are arranged in the other space 36 between the fuel cell 24 and the second horizontal frame 323. Above the lower end portions 48a and 51a of the first radiator 48 and the first fan 51, they protrude above the pair of vertical frames 321.

[0062] The air cleaner 91 is arranged in the lower space 35 in the vicinity of the right rear of the inverter 81. The ion exchanger 92 is arranged in the lower space 35 in the vicinity of the left rear of the inverter 81. The hydrogen sensor 93 is arranged in the lower space 35 between the air cleaner 91 and the ion exchanger 92.

[0063] Note that the arrangement of each device 48, 51, 91 to 93 of the auxiliary equipment 90 is not limited to the present embodiment. For example, the lower end portions 48a and 51a of the first radiator 48 and the first fan 51 may be arranged in the other space 36 between the second horizontal frame 323 and the third horizontal frame 324 between the pair of vertical frames 321. Also, a part or all of each device 91 to 93 may be arranged in the other space 36 behind the lower space 35 or in the other space 36 in front of the lower space 35 between the pair of vertical frames 321. Further, the lower end portions of the second radiator 49 and the second fan 52 may be arranged between the pair of vertical frames 321. Also, at least one of all the devices 48, 49, 51, 52, 91, 92, 93 of the auxiliary equipment 90 may be arranged between the pair of vertical frames 321.

[0064] 〔Operation and Effect of the Embodiment〕 According to the work vehicle 10 of the present embodiment, the devices 30, 81 to 83 of the electrical equipment 80 and the devices 48, 51, 91 to 93 of the auxiliary equipment 90 are arranged between a pair of vertical frames 321 where the fuel cell 24 is provided on the upper side in the chassis 41. Thereby, the space between the pair of vertical frames 321 can be effectively utilized as a space where the electrical equipment 80 and the auxiliary equipment 90 are arranged. As a result, an increase in the size of the work vehicle 10 equipped with the fuel cell 24 can be suppressed.

[0065] The devices 30, 81 to 83 of the electrical equipment 80 and the devices 91 to 93 of the auxiliary equipment 90 are arranged in the lower space 35 below the fuel cell 24 between the pair of vertical frames 321. Thereby, the lower space 35 can be effectively utilized as a space where the electrical equipment 80 and the auxiliary equipment 90 are arranged.

[0066] Since the inverter 81 is arranged between the pair of vertical frames 321 where the fuel cell 24 is provided, the wiring length between the fuel cell 24 and the inverter 81 can be shortened. Further, since the battery unit 30 and the voltage converters 82, 83 are arranged between the pair of vertical frames 321, the wiring length between the battery unit 30 and each of the voltage converters 82, 83 can be shortened.

[0067] Since the air cleaner 91 is arranged between the pair of vertical frames 321 where the fuel cell 24 is provided, the flow path length of the air between the air cleaner 91 and the fuel cell 24 can be shortened. Since the ion exchanger 92 is arranged between the pair of vertical frames 321 where the fuel cell 24 is provided, the flow path length of the coolant between the ion exchanger 92 and the fuel cell 24 can be shortened.

[0068] 〔Others〕 The embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the rights of the present invention is not limited to the above-described embodiments, but includes all modifications within the scope equivalent to the configuration described in the claims.

Description of Reference Numerals

[0069] 10 Work vehicle 11 Vehicle body 12 Travel device 13 Tank 15 Driver's seat 16 Cabin 17 Mounting frame 21 Tank unit 22 Pipe 22f Front pipe 22r Rear pipe 24 Fuel cell 25 Filling part 26 Filling port 30 Battery unit 31 Motor 32 Front frame 33 Transmission case (support) 34 Bonnet 34a Upper surface 35 Lower space 36 Other space 41 Chassis 43 Connecting device 47 Fender 48 First radiator 48a Lower end 49 Second radiator 51 First fan 51a Lower end 52 Second fan 80 Electrical equipment 81 Inverter 82 First voltage converter 83 Second voltage converter 90 Auxiliary equipment 91 Air cleaner 92 Ion exchanger 93 Hydrogen sensor (hydrogen detection part) 111 Cover 111a Upper surface 121 Front wheel 122 Rear wheel 123 Axle 151 Steering 162 Front pillar 163 Rear pillar 164 Roof 165 Front windshield 166 Side glass 167 Step 171 Upper frame part 172 Front frame part 173 Rear frame part 175 Reinforcing frame part 211 Tank case 212 Valve unit 213 Opening / closing door 241 Battery casing 242 Fuel cell stack 300 Battery 301 Battery housing 321 Vertical frame 322 First horizontal frame 323 Second horizontal frame 324 Third horizontal frame 334 PTO shaft (transmission shaft) 340 Working device

Claims

1. A motor, A working device that operates by the power of the motor, A support that supports a transmission shaft for transmitting power from the motor to the working device, and a pair of vertical frames that are connected to the front side of the support and are arranged spaced apart from each other in the vehicle width direction, a vehicle body having the same, Electrical equipment including a battery unit that stores electric power supplied to the motor, A fuel cell provided above the pair of vertical frames and generating electric power stored in the battery unit, Auxiliary equipment associated with the fuel cell, A bonnet that covers the fuel cell, and comprising, A work vehicle, wherein at least one of the electrical equipment and the auxiliary equipment is arranged between the pair of vertical frames.

2. The work vehicle according to claim 1, wherein the at least one device is arranged between the pair of vertical frames and below the fuel cell.

3. The electrical equipment includes the battery unit, an inverter that converts DC power into AC power and outputs it to the motor, and a voltage converter that steps down the power input from the battery unit, The work vehicle according to claim 1 or claim 2, wherein the at least one device arranged between the pair of vertical frames is any one of the battery unit, the inverter, and the voltage converter.

4. The auxiliary equipment includes a radiator that cools the coolant, a fan that supplies an air flow to the radiator, an air cleaner that purifies the air supplied to the fuel cell, an ion exchanger that removes ions from the coolant, and a hydrogen detection unit that detects hydrogen leaked from the hydrogen supply flow path to the fuel cell, The work vehicle according to claim 1 or claim 2, wherein the at least one device arranged between the pair of vertical frames is any one of the radiator, the fan, the air cleaner, the ion exchanger, and the hydrogen detection unit.

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