Work machine

Abstract

To provide a work machine having new technical means for mounting an electric power converter.SOLUTION: A work machine comprises: a vehicle body 11; a fuel cell 24; a battery 30; a motor 31; a first power converter (converter 26); and a second power converter (inverter 27). The vehicle body 11 has a vehicle body frame 41 and a support structure 50 for attaching the first power converter and the second power converter to the vehicle body frame 41. The support structure 50 has: a base 53 attached to the vehicle body frame 41; a first support 51 which has a first erected part erected from the base 53 and in which the first power converter is attached to and supported by the first erected part; and a second support 52 which has a second erected part erected from the base 53 and in which the second power converter is attached to and supported by the second erected part.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a working machine.

Background Art

[0002] From the viewpoint of environmental protection, a working machine equipped with a fuel cell and driven by a motor rotated by the electric power generated by the fuel cell has been proposed (see, for example, Patent Document 1). The working machine disclosed in Patent Document 1 is a tractor. Hydrogen is used as the fuel of the fuel cell.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the case of the working machine as described above, it is necessary to transform the electric power obtained by the fuel cell or convert it from direct current to alternating current. For this purpose, the working machine has a power converter. Therefore, an object of the present disclosure is to provide a working machine having a new technical means for mounting a power converter.

Means for Solving the Problems

[0005] The working machine of the present disclosure includes a vehicle body, a fuel cell mounted on the vehicle body, a battery for storing the electric power generated by the fuel cell, a motor that operates using electric power as energy, a first power converter, and a second power converter. The vehicle body has a vehicle body frame and a support structure for attaching the first power converter and the second power converter to the vehicle body frame. The support structure has a base portion attached to the vehicle body frame, a first upright portion rising from the base portion, and a first support portion to which the first power converter is attached and supported on the first upright portion, and a second upright portion rising from the base portion, and a second support portion to which the second power converter is attached and supported on the second upright portion.

Advantages of the Invention

[0006] According to the working machine of the present disclosure, the first upright portion that supports the first power converter and the second upright portion that supports the second power converter are in a state of rising from the base portion attached to the vehicle body frame. The support structure is reduced in the horizontal direction.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

DETAILED DESCRIPTION OF THE INVENTION

[0008] <SUMMARY OF THE EMBODIMENTS OF THE PRESENT DISCLOSURE> The summary of the embodiments of the present disclosure will be listed and described below. (1) The working machine according to the embodiment of the present disclosure includes a vehicle body, a fuel cell mounted on the vehicle body, a battery for storing electric power generated by the fuel cell, a motor that operates using electric power as energy, a first power converter, and a second power converter. The vehicle body includes a vehicle body frame and a support structure for attaching the first power converter and the second power converter to the vehicle body frame. The support structure includes a base portion attached to the vehicle body frame, a first upright portion rising from the base portion, and a first support portion having the first upright portion and supporting the first power converter attached thereto, and a second upright portion rising from the base portion, and a second support portion having the second upright portion and supporting the second power converter attached thereto.

[0009] According to the working machine having the above configuration, the first upright portion that supports the first power converter and the second upright portion that supports the second power converter are in a state of rising from the base portion attached to the vehicle body frame. The support structure is reduced in the horizontal direction (vehicle width direction).

[0010] (2) Preferably, in the working machine of (1) above, the first power converter is formed in a box shape, and the first upright portion faces one surface of the first power converter formed in the box shape and has a first mounting surface to which the one surface side is attached. According to the above configuration, the first power converter and the first upright portion that supports it are installed so as to rise from the base portion.

[0011] (3) Preferably, in the working machine of (2) above, the second power converter is formed in a box shape, and the second upright portion faces one surface of the second power converter formed in the box shape and has a second mounting surface to which the one surface side is attached. According to the above configuration, the second power converter and the second upright portion that supports it are installed so as to rise from the base portion.

[0012] (4) Preferably, in the working machine of (3) above, the first mounting surface and the second mounting surface are arranged to be spaced apart in the width direction of the vehicle body. (5) Preferably, in the working machine of (4) above, the first power converter is arranged between the first mounting surface and the second mounting surface.

[0013] (6) Preferably, in any one of the working machines of (1) to (5) above, the first support portion and the second support portion are each constituted by a separate member and can be individually attached to the base portion. According to the above configuration, the first power converter and the second power converter can be individually attached and detached, and the assembly workability and maintainability are further improved.

[0014] (7) Preferably, in any one of the working machines of (1) to (5) above, the first support portion, the second support portion, and a part of the base portion are constituted by one member. According to the above configuration, the first support portion, the second support portion, and a part of the base portion are integrated, and being integrated, they can be attached to or detached from the vehicle body.

[0015] (8) Preferably, in any one of the working machines (1) to (7) above, the support structure has a cover that covers a support unit including the first support portion and the second support portion from the side of the vehicle. According to the above configuration, even if foreign matter scatters from the outside of the vehicle body to the support unit, the support unit that supports the first power converter and the second power converter is protected from the foreign matter by the cover.

[0016] (9) Preferably, in the working machine of (8) above, the first support portion and the second support portion are arranged side by side in the vehicle width direction, and the cover covers the support unit from the outside in the vehicle width direction. According to the above configuration, if the cover is removed, maintenance of one or both of the first power converter and the second power converter becomes possible.

[0017] (10) Preferably, in the working machine of (8) or (9) above, each of the first power converter and the second power converter is connected to a harness, and the cover covers the connection portion between the first power converter and the harness and the connection portion between the second power converter and the harness. According to the above configuration, the connection portion of the harness is covered by the cover and protected from foreign matter.

[0018] (11) Preferably, in any one of the working machines (1) to (10) above, the vehicle body has a cabin, and the first support portion and the second support portion are located under the cabin. According to the above configuration, the wiring between one or both of the first power converter and the second power converter and the electrical components installed around the cabin is shortened.

[0019] (12) Preferably, in the working machine of (11) above, the vehicle body has rear wheels on both sides in the vehicle width direction of the vehicle body frame, and the first support portion and the second support portion are located between one of the pair of rear wheels and the vehicle body frame. According to the above configuration, the first power converter and the second power converter are covered from both sides in the vehicle width direction and are protected from trauma.

[0020] (13) In the working machine of (6) above, where the first support portion and the second support portion are each constituted by a separate member, preferably, the support structure includes a first bolt for fixing the first support portion to the base portion, a second bolt for fixing the second support portion to the base portion, and a third bolt for connecting the first support portion and the second support portion. According to the above configuration, the first support portion and the second support portion are connected by a third bolt, and the first support portion and the second support portion are stably attached to the base portion.

[0021] (14) Preferably, in the working machine of any one of (1) to (13) above, the first power converter is located closer to the inside in the vehicle width direction than the second power converter, the second support portion has a second inner frame located closer to the inside in the vehicle width direction of the second power converter as the second upright portion, the outside in the vehicle width direction of the second support portion is open, and the support structure has a cover that covers the second power converter supported by the second support portion from the outside in the vehicle width direction. According to the above configuration, if the cover is removed, the second power converter can be visually recognized in a state where the second power converter is attached to the base portion via the second support portion. Maintenance of the second power converter becomes easy.

[0022] (15) Preferably, in the working machine of (14) above, the first support portion has a first inner frame located closer to the inside in the vehicle width direction of the first power converter as the first upright portion, and the outside in the vehicle width direction is open. According to the above configuration, if the cover and the second support portion that supports the second power converter are removed, the first power converter can be visually recognized while being attached to the base portion via the first support portion. This facilitates the maintenance of the first power converter.

[0023] <Details of Embodiments of the Present Disclosure> Hereinafter, details of embodiments of the present disclosure will be described with reference to the drawings. Note that at least a part of the embodiments described below may be arbitrarily combined.

[0024] 〔Overall Structure of Working Machine〕 FIG. 1 is a perspective view showing an example of the overall structure of a working machine. FIG. 2 is a left side view of the working machine shown in FIG. 1. FIG. 3 is a bottom view of the working machine shown in FIG. 1. FIG. 4 is a right side view of the working machine with some exterior parts (such as the bonnet 34 and the cover 111) removed. The working machine of the present embodiment is a work vehicle used for agricultural work, specifically a tractor. The working machine is not limited to a tractor and may be a moving body such as a construction machine and a utility vehicle. Hereinafter, the case where the working machine is a work vehicle (tractor) 10 will be described.

[0025] The directions of the work vehicle 10 are defined. The work vehicle 10 has a driver's seat 15. Based on the driver sitting on the seat of the driver's seat 15, the front, rear, left, right, and up and down of the work vehicle 10 are defined. That is, the forward direction for the driver is "front", and the backward direction is "rear". The right direction for the driver is "right", and the left direction is "left". The front-rear direction and the left-right direction are parallel to the ground, and the front-rear direction and the left-right direction are orthogonal. The up-down direction is orthogonal to both the front-rear direction and the left-right direction.

[0026] There are cases where the left-right direction is described as the "vehicle width direction". The forward direction is the "travel direction" of the work vehicle 10. In addition, when the work vehicle 10 does not have a driver's seat 15, the working direction of the work vehicle 10 is "front", and the opposite direction is "rear". Looking in the working direction, the right direction of the work vehicle 10 is "right", and the left direction is "left".

[0027] The vehicle body 11 of the work vehicle 10 includes a chassis 41, a drive device 14, a driver's seat 15, a cabin 16, a bonnet 34, a cover 111, a tank unit 21, a first radiator 48, and a second radiator 49. In order from the front to the rear of the vehicle body 11, a bonnet 34 and a cover 111 are mounted on the chassis 41, and a cabin 16 is arranged behind the cover 111.

[0028] The cabin 16 has front pillars, rear pillars, and a roof, and is a driver's cab partitioned by these. The work vehicle 10 may have a canopy or a rollover protective structure (ROPS) instead of the cabin 16. When the work vehicle 10 does not have a cabin 16, the tank unit 21 is arranged above the driver's seat 15 by a mounting frame 17.

[0029] As shown in FIG. 4, a first radiator 48, a fuel cell 24, and a second radiator 49 are mounted on the front part of the chassis 41 in order from the front to the rear. The first radiator 48 and the fuel cell 24 are covered by the bonnet 34, and the second radiator 49 is covered by the cover 111.

[0030] The tank unit 21 has a tank 13 (see FIG. 4) for storing fuel inside. The fuel is liquid or gas, such as hydrogen, methane, carbon monoxide (CO), etc. In this embodiment, the tank 13 stores hydrogen gas. The drive device 14 is driven by the stored fuel. The work vehicle 10 is a fuel cell vehicle (FCV: Fuel Cell Vehicle), and runs using the electric power generated by the chemical reaction of hydrogen and oxygen in the fuel cell 24 as an energy source. The fuel cell 24 may generate electric power by methane or carbon monoxide (CO).

[0031] The drive device 14 (see Fig. 5) includes a fuel cell 24, a battery unit 30, and a motor 31. The battery unit 30 has a battery pack (battery) that stores the electric power generated by the fuel cell 24. The work vehicle 10 has a hydrogen gas pipe 22. Hydrogen gas is supplied from a filling port 42 (see Fig. 6) connected to the end of the pipe 22 and filled into the tank 13. The hydrogen gas in the tank 13 is supplied to the fuel cell 24 through the pipe 22.

[0032] The traveling device 12 of the work vehicle 10 has front wheels 12A and rear wheels 12B. The front wheels 12A and rear wheels 12B are arranged symmetrically with respect to the vehicle body 11 in the left - right direction. One or both of the front wheels 12A and rear wheels 12B rotate by the power of the motor 31. One or both of the wheels 12A, 12B (drive wheels) that rotate by the power of the motor 31 may be crawlers (endless tracks).

[0033] 〔Internal Structure of Work Vehicle〕 Fig. 5 is a perspective view showing an example of the internal structure of the work vehicle 10. The chassis 41 is configured to have a steel frame that is long in the front - rear direction, and has a front frame 32 and a gear case 33. The gear case 33 is connected to the rear part of the front frame 32. The framework of the vehicle body 11 is formed by the gear case 33 and the front frame 32. The chassis 41 serves as a vehicle body frame on which the drive device 14, the driver's seat 15, the cabin 16, etc. are mounted.

[0034] A mounting frame 17 for the tank unit 21 is connected to the chassis 41. The mounting frame 17 supports the tank unit 21 above the cabin 16. The mounting frame 17 includes a substantially rectangular ceiling frame 17A whose front - rear direction is longer than the left - right direction, a plurality of pillars 17B that support the ceiling frame 17A from below, and a pair of left - right reinforcing frames 17C connected to the front end of the ceiling frame 17A.

[0035] The tank unit 21 is connected to the ceiling frame 17A. The reinforcing frame 17C is a reinforcing diagonal member that slopes downward from the front end of the ceiling frame 17A to the front frame 32. By having the reinforcing frame 17C, the longitudinal rigidity of the mounting frame 17 is increased.

[0036] The support frame 37 is connected to the chassis 41, and the battery unit 30 is supported by the vehicle body 11 by the support frame 37. Specifically, the motor 31 is mounted on the front frame 32 of the chassis 41, and the support frame 37 is attached to the corresponding portion of the motor 31 on the front frame 32. The support frame 37 is composed of, for example, a metal frame member and is attached in a cantilever state so as to protrude to the right from the front frame 32.

[0037] The gear case 33 located behind the motor 31 has a power transmission mechanism inside. The power transmission mechanism includes a transmission, a clutch, and a differential gear, and decelerates or accelerates the rotation of the output shaft of the motor 31 and transmits it to the traveling device 12. The power transmission mechanism inside the gear case 33 includes a branch mechanism that outputs a part of the power of the motor 31 to the PTO shaft 334 (see FIG. 4). The PTO shaft 334 is an output shaft that protrudes from the rear of the gear case 33.

[0038] The work vehicle 10 has a connecting device 43 (see FIGS. 3 and 4) for connecting a work device 19 (see FIG. 6), which is for performing a desired agricultural operation, behind the vehicle body 11. The work device 19 is also called an implement. The work device 19 is, for example, a tiller and a baler. The rotational motion of the PTO shaft 334 is transmitted to the input shaft of the work device 19, for example, while the work vehicle 10 is traveling. The work vehicle 10 can drive the work device 19 by the power of the motor 31 while traveling in a field or the like.

[0039] 〔Functional Configuration of Work Vehicle〕 FIG. 6 is a block diagram showing an example of the functional configuration of the work vehicle 10. As shown in FIG. 6, the functional system of the work vehicle 10 includes a fuel system FS, a power system PS, and a temperature control system TS.

[0040] The components of the fuel system FS include a tank 13 and a valve unit 45. The components of the temperature control system TS include a first radiator 48, a second radiator 49, and an air conditioner 37. The components of the power system PS include a fuel cell 24, a boost circuit 28, a DC / DC converter (first power converter) 26, an inverter (second power converter) 27, a motor 31, a gear case 33, and a battery unit 30. Hereinafter, the DC / DC converter 26 is also referred to as the "converter 26". In the case of this embodiment, the converter 26 is configured to include a first DC / DC converter 26A (also referred to as the "first converter 26A") and a second DC / DC converter 26B (also referred to as the "second converter 26B").

[0041] The tank 13 is connected to a first pipe 22A and a second pipe 22B via the valve unit 45. The first pipe 22A is a gas pipe connecting the filling port 42 and the valve unit 45, and guides the hydrogen gas introduced into the filling port 42 to the tank 13. The second pipe 22B is a gas pipe connecting the fuel cell 24 and the valve unit 45, and guides the hydrogen gas stored in the tank 13 to the fuel cell 24.

[0042] The valve unit 45 is an assembly of valves including an on-off valve and a pressure reducing valve inside. By controlling the operation of the internal valves, the valve unit 45 adjusts the flow rate of the hydrogen gas in the tank 13 and leads it to the fuel cell 24.

[0043] The motor 31 has a rotor and a stator having a plurality of coils, and drives the output shaft at a predetermined torque and rotational speed. In the case of this embodiment, only one motor 31 is mounted on the work vehicle 10, and the rotating shaft of the motor 31 is coupled to the gear case 33. The power transmission mechanism of the gear case 33 outputs part of the power of the motor 31 to the traveling device 12 and outputs the remaining power of the motor 31 to the PTO shaft 334.

[0044] The fuel cell 24 is, for example, a battery module in which a plurality of single cells each having a positive electrode and a negative electrode are arranged in parallel in a stacked state in a casing. The fuel cell 24 aggregates the electric power generated by each single cell to generate the electric power necessary for driving the motor 31. The fuel cell 24 is connected to the second radiator 49 through the cooling flow path H2. That is, the fuel cell 24 is adjusted to a predetermined temperature by the coolant circulated from the second radiator 49.

[0045] The fuel cell 24 is electrically connected to the boost circuit 28, and the boost circuit 28 is electrically connected to the inverter 27. The boost circuit 28 boosts the voltage input from the fuel cell 24 and outputs it to the inverter 27. The inverter 27 is electrically connected to the motor 31. The inverter 27 converts the direct current input from the boost circuit 23 into three-phase alternating current and outputs it to the motor 31. The electric power generated by the fuel cell 24 is converted into boosted and alternating current and transmitted to the motor 31.

[0046] The work vehicle 10 has electrical components with a low voltage that operate at a lower voltage than the motor 31. For these electrical components, direct current power stepped down by a step-down circuit is supplied. The electrical components with a low voltage are, for example, the battery unit 30, the first radiator 48, the second radiator 49, and the air conditioner 37. The step-down circuit is, for example, the converter 26, and in the case of this embodiment, the first converter 26A and the second converter 26B.

[0047] The first converter 26A steps down the direct current voltage input from the boost circuit 28 and supplies it to the battery unit 30 and the air conditioner 37. The second converter 26B steps down the direct current voltage input from the boost circuit 28 and supplies it to the first radiator 48 and the second radiator 49.

[0048] The inverter 27 and the converters 26 (the first converter 26A and the second converter 26B) are attached to the chassis 41 serving as the vehicle body frame (see FIG. 3) by a support structure 50. The inverter 27 and the converters 26 are mounted near the driver's seat 15 (see FIG. 2).

[0049] The battery unit 30 is a power storage device that temporarily stores electric power supplied to the motor 31. The battery unit 30 has a battery pack 30A (see FIG. 6). The battery pack 30A includes at least one battery. The battery is a charge-discharge type secondary battery such as a lithium-ion battery or a lead-acid battery, for example.

[0050] As described above (see FIG. 4), the first radiator 48 is disposed in front of the fuel cell 24, and the second radiator 49 is disposed behind the fuel cell 24. The first radiator 48 and the second radiator 49 are included in a cooling system that cools electrical components such as the motor 31, the boost circuit 28, the inverter 27, the first converter 26A, and the second converter 26B that operate using electric power as energy, in addition to the fuel cell 24, with a refrigerant (cooling liquid).

[0051] A cooling flow path H1 through which the refrigerant is circulated by a pump 46 is connected to the first radiator 48, and the refrigerant is cooled by heat exchange with the outside air. The first radiator 48 has a first fan 35 for promoting heat exchange with the outside air. The cooling targets of the temperature control unit including the first radiator 48 and the cooling flow path H1 are electrical components (heat-generating components) such as the motor 31, the boost circuit 28, the inverter 27, the first converter 26A, and the second converter 26B, for example.

[0052] A cooling flow path H2 through which the refrigerant is circulated by a pump 47 is connected to the second radiator 49, and the refrigerant is cooled by heat exchange with the outside air. The second radiator 49 has a second fan 36 for promoting heat exchange with the outside air. The cooling target by the temperature control unit including the second radiator 49 and the cooling flow path H2 is the fuel cell 24.

[0053] Regarding the support structure 50 As described above (see FIG. 2), the inverter 27 and the converter 26 are mounted near the driver's seat 15. The vehicle body 11 has a support structure 50. The support structure 50 attaches the converter 26 and the inverter 27 to the chassis 41, which is the vehicle body frame. In the case of this embodiment, the converter 26 includes a first converter 26A and a second converter 26B.

[0054] FIG. 7 is a perspective view of the support structure 50 as viewed from the outside in the vehicle width direction. FIG. 8 is an exploded view of the support structure 50 shown in FIG. 7. FIG. 9 is a perspective view of the support structure 50 as viewed from the inside in the vehicle width direction. As shown in FIG. 9, the converter 26 has a plurality of terminals (connection parts) 28A on its front surface, and a plurality of harnesses 38A are connected to the converter 26. The inverter 27 has a plurality of terminals (connection parts) 28B on its front surface, and a plurality of harnesses 38B are connected to the inverter 27. In FIG. 9, the harnesses 38A and 38B are indicated by imaginary lines (two-dot chain lines).

[0055] In FIG. 8, the support structure 50 has a base portion 53, a first support portion 51, a second support portion 52, and a cover 54.

[0056] The base portion 53 is attached to a part of the chassis 41 (see FIG. 7), which is the vehicle body frame. In the case of this embodiment (see FIG. 3), the base portion 53 is attached to the bottom of the gear case 33 of the chassis 41 by bolts 90A (see FIG. 7). As shown in FIG. 8, the base portion 53 has a base body 531 that is long in the front-rear direction and an arm 532 that is long in the vehicle width direction. The arm 532 is a member that connects the base body 531 to the gear case 33.

[0057] The base portion 53 has a first support column 533 and a second support column 534. The first support column 533 and the second support column 534 are provided so as to rise upward from the base body 531. The first support column 533 supports a harness 38A connected to the converter 26 (see FIG. 9). The second support column 534 supports a harness 38B connected to the inverter 27.

[0058] The first support portion 51 is attached on the base portion 53 (base body 531). The first support portion 51 supports the converter 26 which is a first power converter. The first support portion 51 has a frame structure made of a metal plate. As shown in FIG. 8, the first support portion 51 has a first inner frame 511, a first upper frame 512, a first lower frame 513, and a first rear frame 514, each of which is plate-shaped.

[0059] The first lower frame 513 is placed on the base body 531 and fixed by bolts 90C. The space surrounded by the first inner frame 511, the first upper frame 512, the first lower frame 513, and the first rear frame 514 becomes the accommodation space for the converter 26. The first support portion 51 is open at the front, and from the opening, a harness 38A (see FIG. 9) is provided to extend.

[0060] The first support portion 51 supports the first converter 26A and the second converter 26B arranged side by side in the vertical direction. Each of the first converter 26A and the second converter 26B is fixed to the first support portion 51 by bolts 90B (see FIG. 8). The first inner frame 511 has an opening window frame 511a, and (a plurality of) holes penetrating in the plate thickness direction are provided, and heat dissipation measures for the converter 26 are taken.

[0061] In this way, the first support portion 51 has the first inner frame 511 as a first standing portion rising from the base body 531 of the base portion 53. The converter 26 is attached to and supported by the first inner frame 511.

[0062] The second support portion 52 is mounted on the base portion 53 (base main body 531). The second support portion 52 supports the inverter 27 which is a second power converter. The second support portion 52 has a frame structure made of a metal plate. The second support portion 52 has a second inner frame 521, a second lower frame 523, and a second rear frame 524, each of which is plate-shaped.

[0063] The second lower frame 523 is placed on the base main body 531 and fixed by bolts 90D. The space surrounded by the second inner frame 521, the second lower frame 523, and the second rear frame 524 becomes the accommodation space for the inverter 27. The second support portion 52 is open at the front, and a harness 38B (see FIG. 9) extends from the opening.

[0064] The second support portion 52 supports the inverter 27. The inverter 27 is fixed to the second support portion 52 by bolts 90E (see FIG. 8). The second inner frame 521 has an opening window frame 521a and is provided with (a plurality of) holes penetrating in the plate thickness direction, and heat dissipation measures for the inverter 27 are taken.

[0065] In this way, the second support portion 52 has the second inner frame 521 as a second upright portion standing up from the base main body 531 of the base portion 53. The inverter 27 is attached to and supported by the second inner frame 521.

[0066] The work vehicle 10 of the present embodiment has two converters 26 and one inverter 27. Note that there may be one converter 26, and the inverter 27 may be configured to be separated into two.

[0067] The first support portion 51 and the second support portion 52 mounted on the base portion 53 are called a support unit 50U (see FIG. 9). That is, the support unit 50U includes the first support portion 51 and the second support portion 52. On the base portion 53, the first support portion 51 and the second support portion 52 are arranged side by side in the vehicle width direction. The cover 54 covers the support unit 50U from the vehicle side.

[0068] As shown in FIG. 2, the vehicle body 11 has a cabin 16. The support unit 50U (the first support portion 51 and the second support portion 52) is located below the cabin 16. Therefore, the wiring between the converter 26 and the inverter 27 supported by the first support portion 51 and the second support portion 52 and the electrical components (for example, the air conditioner 37) installed around the cabin 16 is shortened.

[0069] The vehicle body 11 has rear wheels 12B on both sides in the vehicle width direction of a chassis 41 which is a vehicle body frame (see FIG. 3). The first support portion 51 and the second support portion 52 are located between one of the pair of rear wheels 12B (the left rear wheel 12B) and the chassis 41 (the gear case 33) which is a vehicle body frame. With this configuration, the converter 26 and the inverter 27 are covered from both sides in the vehicle width direction and are protected from trauma.

[0070] To further explain the respective component configurations of the support structure 50, the shapes of the converter 26 and the inverter 27 will be described. As shown in FIG. 8, the converter 26 (the first converter 26A, the second converter 26B) and the inverter 27 of the present embodiment are each formed in a box shape. The converter 26 (the first converter 26A, the second converter 26B) has a form that fits into a flat virtual rectangular parallelepiped Q1. The inverter 27 has a form that fits into a flat virtual rectangular parallelepiped Q2.

[0071] The first support portion 51 supports the converter 26 such that, in the rectangular parallelepiped Q1 of the converter 26, the surface q1 with the largest area becomes a side surface facing in the horizontal direction. For this purpose, the first inner frame 511, which is a first standing portion, faces one surface of the converter 26 formed in the box shape and has a first attachment surface 511b to which that one surface side is attached.

[0072] The second support portion 52 supports the inverter 27 such that, in the rectangular parallelepiped Q2 of the inverter 27, the surface q2 with the largest area becomes a side surface facing in the horizontal direction. For this purpose, the second inner frame 521, which is a second standing portion, faces one surface of the inverter 27 formed in the box shape and has a second attachment surface 521b to which that one surface side is attached.

[0073] The first support portion 51 (the first inner frame 511 which is a first standing portion) that supports the converter 26 is installed so as to rise from the base portion 53. Together with the first support portion 51, the second support portion 52 (the second inner frame 521 which is a second standing portion) that supports the inverter 27 is installed so as to rise from the base portion 53. According to the arrangement of the first support portion 51 and the second support portion 52, as shown in FIG. 9, the support structure 50 (support unit 50U) becomes smaller in the horizontal direction (vehicle width direction).

[0074] In the case of this embodiment (see FIG. 8), the first support portion 51 and the second support portion 52 are each constituted by separate members. The first support portion 51 and the second support portion 52 can be individually attached to the base portion 53. The first support portion 51 is fixed to the base portion 53 by bolts 90C. The second support portion 52 is fixed to the base portion 53 by bolts 90D. That is, the support structure 50 has a first bolt 90C that fixes the first support portion 51 to the base portion 53 and a second bolt 90D that fixes the second support portion 52 to the base portion 53.

[0075] The first support part 51 that supports the converter 26 is installed so as to rise from the base part 53, and the second support part 52 that supports the inverter 27 is installed so as to rise from the base part 53. The first support part 51 and the second support part 52 are narrow in width and have a vertically long posture. Therefore, the first support part 51 has the first flange plate 515, and the second support part 52 has the second flange plate 525. The support structure 50 has a third bolt 90F that connects the first support part 51 and the second support part 52 (see FIG. 7). The first flange plate 515 and the second flange plate 525 are connected by the third bolt 90F. For this reason, although the first support part 51 and the second support part 52 are narrow in width and have a vertically long posture, they are stably attached to the base part 53.

[0076] The cover 54 covers the support unit 50U from the side of the vehicle. More specifically, the cover 54 covers the support unit 50U from the outside in the vehicle width direction. Even if foreign matter scatters from the outside of the vehicle body 11 to the support unit 50U, the support unit 50U is protected from the foreign matter by the cover 54.

[0077] The cover 54 has a side wall 541 and an upper wall 542. The side wall 541 covers the support unit 50U from the outside in the vehicle width direction. The upper wall 542 covers the support unit 50U from above. The cover 54 is made of metal and is formed by bending a plate material. The upper wall 542 and the side wall 541 are integral. The front of the cover 54 is open.

[0078] As shown in FIG. 9, the harness 38A and the harness 38B extend from the opening in the front of the cover 54. The cover 54 covers the connection part (terminal 28A) between the converter 26 and the harness 38A, and the connection part (terminal 28B) between the inverter 27 and the harness 38B. The connection parts of the harnesses 38A and 38B are covered by the cover 54 and are protected from foreign matter.

[0079] The first mounting surface 511b of the first inner frame 511 and the second mounting surface 521b of the second inner frame 521 are arranged to be spaced apart in the vehicle body width direction. A converter 26 is arranged between the first mounting surface 511b and the second mounting surface 521b.

[0080] In the case of this embodiment (see FIG. 9), the converter 26 is located closer to the inner side in the vehicle width direction than the inverter 27. FIG. 10 is a perspective view of the support structure 50 with the cover 54 removed. FIG. 11 is a perspective view of the support structure 50 with the second support portion 52 and the inverter 27 removed. The second support portion 52 has a second inner frame 521 located on the inner side in the vehicle width direction of the inverter 27. The inverter 27 is provided along the second inner frame 521. The second support portion 52 does not have a frame located on the outer side in the vehicle width direction of the inverter 27. That is, with the second support portion 52 attached to the base portion 53, the outer side in the vehicle width direction of the second support portion 52 is open.

[0081] And the cover 54 covers the inverter 27 supported by the second support portion 52 from the outer side in the vehicle width direction (see FIG. 7). According to this configuration, if the cover 54 is removed, as shown in FIG. 10, the inverter 27 can be visually recognized in a state where the inverter 27 is attached to the base portion 53 via the second support portion 52. Maintenance of the inverter 27 becomes easy.

[0082] The first support portion 51 has a first inner frame 511 located on the inner side in the vehicle width direction of the converter 26 (see FIGS. 9 and 11). The two converters 26 are provided along the first inner frame 511. As shown in FIG. 11, the first support portion 51 does not have a frame located on the outer side in the vehicle width direction of the converter 26. That is, with the first support portion 51 attached to the base portion 53, the outer side in the vehicle width direction of the first support portion 51 is open.

[0083] According to this configuration, if the cover 54 and the second support portion 52 that supports the inverter 27 are removed, the converter 26 can be visually recognized in a state where it is attached to the base portion 53 via the first support portion 51. This facilitates the maintenance of the converter 26. The first support portion 51 and the second support portion 52 are arranged side by side in the vehicle width direction. For this reason, the second support portion 52 that supports the inverter 27 covers the converter 26 from the outside in the vehicle width direction.

[0084] As described above (see FIG. 2), the vehicle body 11 that can travel has a chassis 41 that serves as a vehicle body frame and a support structure 50 for attaching the converter 26 and the inverter 27 to the chassis 41. The support structure 50 (see FIGS. 7 and 8) has a base portion 53 attached to the chassis 41, a first support portion 51 attached on the base portion 53 and supporting the converter 26, and a second support portion 52 attached on the base portion 53 and supporting the inverter 27. The first support portion 51 that supports the converter 26 and the second support portion 52 that supports the inverter 27 are placed and attached on the base portion 53 attached to the inverter 27. The assembly workability and maintainability of the converter 26 and the inverter 27 are good.

[0085] 〔Modification example of the support unit 50U〕 In the case of the support structure 50 shown in FIGS. 8 and 9, as described above, the first support portion 51 and the second support portion 52 are each constituted by separate members. With this configuration, the converter 26 and the inverter 27 can be individually attached and detached.

[0086] FIG. 12 is a perspective view showing a first modification example of the support structure 50. FIG. 13 is a perspective view showing the support structure 50 of FIG. 12 in a disassembled state. In the case of the first modification example, the first support portion 51, the second support portion 52, and the base main body 531 which is a part of the base portion 53 are formed of one member. The second inner frame 521 of the second support portion 52 is fixed to the base main body 531, for example, by welding, and stands up from the base main body 531. The first inner frame 511 of the first support portion 51 is fixed to the base main body 531, for example, by welding, and stands up from the base main body 531.

[0087] The first support portion 51, the second support portion 52, and the base main body 531 are integrated, and they can be attached to or detached from the vehicle body 11 side (arm 532) integrally. In the first modification example shown in FIGS. 12 and 13, the same components as those in the forms shown in FIGS. 7 and 8 are denoted by the same reference numerals.

[0088] FIGS. 14 and 15 are perspective views showing still another modification example (second modification example) of the support structure 50. In the case of the second modification example, similar to the first modification example, the first support portion 51, the second support portion 52, and the base main body 531 which is a part of the base portion 53 are formed of one member. The second inner frame 521 of the second support portion 52 is fixed to the base main body 531, for example, by welding, and stands up from the base main body 531. The first inner frame 511 of the first support portion 51 is fixed to the base main body 531, for example, by welding, and stands up from the base main body 531.

[0089] In the second modification example shown in FIGS. 14 and 15, the same components as those in the forms shown in FIGS. 7 and 8 are denoted by the same reference numerals. In the case of the second modification example, the number of converters 26 is one.

[0090] Also in the first modification example (Figs. 12 and 13) and the second modification example (Figs. 14 and 15), similar to the forms shown in Figs. 7 and 8, the support structure 50 includes a base portion 53, a first support portion 51, and a second support portion 52. The base portion 53 is a portion attached to the chassis (vehicle body frame) 41. The base portion 53 includes a base main body 531 and an arm 532.

[0091] The first support portion 51 has a first inner frame 511 as a first upright portion rising from the base main body 531. The converter 26 is attached to and supported by the first inner frame 511. The second support portion 52 has a second inner frame 521 as a second upright portion rising from the base main body 531. The inverter 27 is attached to and supported by the second inner frame 521.

[0092] Also in the first modification example (Figs. 12 and 13) and the second modification example (Figs. 14 and 15), similar to the forms shown in Figs. 7 and 8, the converter 26 and the inverter 27 are each formed in a box shape. The first inner frame 511 faces one surface of the converter 26 formed in a box shape and has a first attachment surface 511b to which the one surface side is attached. The second inner frame 521 faces one surface of the inverter 27 formed in a box shape and has a second attachment surface 521b to which the one surface side is attached. The first attachment surface 511b and the second attachment surface 521b are arranged to be spaced apart in the width direction of the vehicle body 11. The converter 26 is arranged between the first attachment surface 511b and the second attachment surface 521b. The inverter 27 is arranged outside the second attachment surface 512b in the vehicle width direction.

[0093] [Others] The above embodiments are illustrative in all respects and not restrictive. The scope of the rights of the present invention is indicated by the claims rather than the above embodiments, and includes all modifications within the scope equivalent to the configurations described in the claims.

Explanation of Reference Numerals

[0094] 10 Work vehicle (working machine) 11 Vehicle body 12B Rear wheel 16 Cabin 24 Fuel cell 26 Converter (first power converter) 26A First converter (first power converter) 26B Second converter (first power converter) 27 Inverter (second power converter) 28A Terminal (connection part) 28B Terminal (connection part) 30A Battery pack (battery) 31 Motor 38A Harness 38B Harness 41 Chassis (vehicle body frame) 50 Support structure 50U Support unit 51 First support part 52 Second support part 53 Base part 54 Cover 90C Bolt (first bolt) 90D Bolt (second bolt) 90F Third bolt 511 First inner frame (first standing part) 511b First mounting surface 521 Second inner frame (second standing part) 521b Second mounting surface

Claims

1. A work machine having a vehicle body, a fuel cell mounted on the vehicle body, a battery for storing electric power generated by the fuel cell, a motor operating using electric power as energy, a first power converter, and a second power converter, wherein the vehicle body has a vehicle body frame and a support structure for attaching the first power converter and the second power converter to the vehicle body frame, the support structure comprising: a base portion attached to the vehicle body frame, a first support portion having a first upright portion rising from the base portion and supporting the first power converter attached to the first upright portion, a second support portion having a second upright portion rising from the base portion and supporting the second power converter attached to the second upright portion, and the work machine having the above.

2. The first power converter is formed in a box shape, and the first upright portion faces one surface of the first power converter formed in the box shape and has a first attachment surface to which the one surface side is attached. The work machine according to claim 1.

3. The second power converter is formed in a box shape, and the second upright portion faces one surface of the second power converter formed in the box shape and has a second attachment surface to which the one surface side is attached. The work machine according to claim 2.

4. The first attachment surface and the second attachment surface are spaced apart in the width direction of the vehicle body. The work machine according to claim 3.

5. The first power converter is disposed between the first attachment surface and the second attachment surface. The work machine according to claim 4.

6. The first support portion and the second support portion are each constituted by a separate member and can be individually attached to the base portion. The work machine according to claim 1.

7. The first support portion, the second support portion, and a part of the base portion are constituted by one member. The work machine according to claim 1.

8. The support structure comprises: a cover that covers a support unit including the first support portion and the second support portion from the side of the vehicle. The work machine according to claim 1.

9. The first support portion and the second support portion are arranged side by side in the vehicle width direction, and the cover covers the support unit from the outside in the vehicle width direction. The work machine according to claim 8.

10. Each of the first power converter and the second power converter is connected to a harness, The work machine according to claim 8 or claim 9, wherein the cover covers a connection portion between the first power converter and the harness and a connection portion between the second power converter and the harness.

11. The vehicle body has a cabin, The work machine according to claim 1, wherein the first support portion and the second support portion are located below the cabin.

12. The vehicle body has rear wheels on both sides in the vehicle width direction of the vehicle body frame, The work machine according to claim 11, wherein the first support portion and the second support portion are located between one of the pair of rear wheels and the vehicle body frame.

13. The work machine according to claim 6, wherein the support structure includes a first bolt that fixes the first support portion to the base portion, a second bolt that fixes the second support portion to the base portion, and a third bolt that connects the first support portion and the second support portion.

14. The first power converter is located closer to the inner side in the vehicle width direction than the second power converter, The second support portion has a second inner frame located on the inner side in the vehicle width direction of the second power converter as the second upright portion, and the outer side in the vehicle width direction of the second support portion is open, The work machine according to claim 1, wherein the support structure has a cover that covers the second power converter supported by the second support portion from the outer side in the vehicle width direction.

15. The work machine according to claim 14, wherein the first support portion has a first inner frame located on the inner side in the vehicle width direction of the first power converter as the first upright portion, and the outer side in the vehicle width direction is open.

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