Work machine

Abstract

To provide a work machine capable of efficiently arranging a hydraulic device group, a fuel device group, and a high-voltage device group in a limited space on a revolving frame.SOLUTION: In a work machine (100), a fuel pipe (40A) is disposed at a position offset from an inter-high-voltage equipment space (50S) between first high-voltage equipment (51) and second high-voltage equipment (52) of a high-voltage equipment group (50) and inter-hydraulic equipment space (60S) between first hydraulic equipment (61) and second hydraulic equipment (62) of a hydraulic equipment group (60). A high-voltage cable (50A) is disposed at a position offset from inter-fuel equipment space (40S) and the inter-hydraulic equipment space (60S) between a fuel tank (41) and a fuel cell device (42) of a fuel equipment group (40). The hydraulic pipe (60A) is disposed at a position offset from the inter-fuel equipment space (40S) and the inter-high-voltage equipment space (50S).SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a work machine equipped with a fuel cell device. [Background technology]

[0002] Generally, a work machine such as a hydraulic excavator comprises a lower running body, an upper rotating body rotatably supported on the lower running body, a work implement including a boom rotatably supported on the upper rotating body, a group of hydraulic equipment, an engine as a power source, and a cab.

[0003] For example, U.S. Patent No. 5,399,633 discloses a work machine including a frame, at least one implement, a linkage assembly movably connected to the implement and the frame, an energy recovery system including an energy storage system, and an engine, where the energy storage system of the work machine includes at least one of a hydraulic accumulator, a battery, a flywheel, an ultracapacitor, a fuel cell, and an auxiliary power unit. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-9589 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when a fuel cell device is adopted as a power source in a work machine instead of an internal combustion engine such as a diesel engine or a gasoline engine, the following problem occurs. A work machine equipped with a fuel cell device as a power source includes a fuel device group and a high-voltage device group in addition to a hydraulic device group. The fuel device group includes, for example, a fuel tank and a fuel cell device, and the high-voltage device group includes, for example, an electric motor to which power output from the fuel cell device is supplied and its peripheral devices. The hydraulic device group, the fuel device group and the high-voltage device group need to be arranged in a limited space on the revolving frame. Specifically, these devices need to be arranged in a limited space on the revolving frame excluding an area where the cab is arranged and an area where the base end of the boom is attached, and the fuel cell device and the fuel tank (for example, a hydrogen tank) included in the fuel device group require a relatively large installation space. Therefore, when a fuel cell device is adopted as a power source instead of the internal combustion engine, it is necessary to efficiently arrange the fuel device group, the high-voltage device group and the hydraulic device group in the limited space on the revolving frame.

[0006] The technology described in Patent Document 1 does not take into consideration the above-mentioned problems related to the arrangement of the fuel equipment group, the high-voltage equipment group, and the hydraulic equipment group.

[0007] An object of the present disclosure is to provide a work machine in which a fuel device group, a high-voltage device group, and a hydraulic device group can be efficiently arranged in a limited space on a revolving frame. [Means for solving the problem]

[0008] A working machine according to a first aspect includes a fuel equipment group including a fuel tank and a fuel cell device, a high-voltage equipment group including a first high-voltage equipment and a second high-voltage equipment, a hydraulic equipment group including a first hydraulic equipment and a second hydraulic equipment, a fuel piping connecting the fuel tank and the fuel cell device, a high-voltage cable connecting the first high-voltage equipment and the second high-voltage equipment, and hydraulic piping connecting the first hydraulic equipment and the second hydraulic equipment, wherein the fuel piping is arranged at a position offset from a high-voltage equipment inter-space between the first high-voltage equipment and the second high-voltage equipment and an inter-hydraulic equipment space between the first hydraulic equipment and the second hydraulic equipment, the high-voltage cable is arranged at a position offset from the fuel equipment inter-space and the hydraulic equipment inter-space between the fuel tank and the fuel cell device, and the hydraulic piping is arranged at a position offset from the fuel equipment inter-space and the high-voltage equipment inter-space.

[0009] In the first aspect, since no high-voltage cable or hydraulic piping is interposed between the fuel tank and the fuel cell device, the interval between the fuel cell device and the fuel tank is prevented from increasing due to the high-voltage cable and hydraulic piping, and thus the space required for installing the fuel equipment group is prevented from increasing. Furthermore, since no fuel piping or hydraulic piping is interposed between the first high-voltage device and the second high-voltage device, the interval between the first high-voltage device and the second high-voltage device is prevented from increasing due to the fuel piping and hydraulic piping, and thus the space required for installing the high-voltage device group is prevented from increasing. Furthermore, since no fuel piping or high-voltage cable is interposed between the first hydraulic device and the second hydraulic device, the interval between the first hydraulic device and the second hydraulic device is prevented from increasing due to the fuel piping and high-voltage cable, and thus the space required for installing the hydraulic device group is prevented from increasing. Thus, in the first aspect, the fuel equipment group, the high-voltage equipment group, and the hydraulic equipment group can be efficiently arranged in the limited space on the revolving frame.

[0010] A second aspect is preferably the work machine according to the first aspect further comprising the following configuration. That is, in the work machine according to the second aspect, it is preferable that the fuel piping is arranged at a position offset from the high-voltage-related area in which the high-voltage equipment group and the high-voltage cable are arranged and the hydraulic-related area in which the hydraulic equipment group and the hydraulic piping are arranged, the high-voltage cable is arranged at a position offset from the fuel-related area in which the fuel equipment group and the fuel piping are arranged and the hydraulic-related area, and the hydraulic piping is arranged at a position offset from the fuel-related area and the high-voltage-related area. In this second aspect, since a high-voltage cable and hydraulic piping are not arranged in the fuel-related area, not only is the interval between the fuel cell device and the fuel tank prevented from becoming large due to the high-voltage cable and hydraulic piping, but the length of the fuel piping is also prevented from becoming large due to the high-voltage cable and hydraulic piping, and thus the fuel-related area is prevented from becoming large. In addition, since fuel piping and hydraulic piping are not arranged in the high-voltage related area, not only is the interval between the first high-voltage device and the second high-voltage device suppressed from becoming large due to the fuel piping and hydraulic piping, but also the length of the high-voltage cable is suppressed from becoming large due to the fuel piping and hydraulic piping, thereby suppressing the high-voltage related area from becoming large. Furthermore, since fuel piping and high-voltage cables are not arranged in the hydraulic related area, not only is the interval between the first hydraulic device and the second hydraulic device suppressed from becoming large due to the fuel piping and high-voltage cable, but also the length of the hydraulic piping is suppressed from becoming large due to the fuel piping and high-voltage cable, thereby suppressing the high-voltage related area from becoming large. Therefore, in the second aspect, the fuel device group, the high-voltage device group, and the hydraulic device group are more efficiently arranged in the limited space on the revolving frame.

[0011] A third aspect is preferably the work machine according to the second aspect further comprising the following configuration. That is, in the work machine according to the third aspect, it is preferable that the fuel equipment group is arranged at a position shifted from the high-voltage related area and the hydraulic related area, the high-voltage equipment group is arranged at a position shifted from the fuel related area and the hydraulic related area, and the hydraulic equipment group is arranged at a position shifted from the fuel related area and the high-voltage related area. In this third aspect, not only are high-voltage cables and hydraulic piping not arranged in the fuel related area, but also the high-voltage equipment group and the hydraulic equipment group are not arranged, not only are fuel piping and hydraulic piping not arranged in the high-voltage related area, but also the fuel equipment group and the hydraulic equipment group are not arranged, and not only are fuel piping and high-voltage cables not arranged in the hydraulic related area, but also the fuel equipment group and the high-voltage equipment group are not arranged. That is, in the third aspect, the fuel related area, the high-voltage related area, and the hydraulic related area are clearly separated. This allows the devices and connecting members (fuel piping, high-voltage cables, or hydraulic piping) in each of these areas to be concentrated and arranged in a centralized manner, which allows the fuel devices, high-voltage devices, and hydraulic devices to be arranged more efficiently.

[0012] A fourth aspect is preferably the work machine according to any one of the first to third aspects further comprising the following configuration: That is, in the work machine according to the fourth aspect, it is preferable that the fuel tank is a hydrogen tank that stores hydrogen, and the hydrogen tank is located at a higher position than the high voltage equipment group and the hydraulic equipment group. In this fourth aspect, because the hydrogen tank is located at a higher position than the high voltage equipment group and the hydraulic equipment group, even if hydrogen leaks, the hydrogen moves upward, which is the opposite direction to the direction toward the high voltage equipment group and the hydraulic equipment group, and is discharged to the outside of the work machine.

[0013] A fifth aspect may be the work machine according to any one of the first to fourth aspects, further comprising the following configuration. That is, the work machine according to the fifth aspect further comprises an outer wall, the fuel tank is a hydrogen tank that stores hydrogen, and the outer wall preferably has a fuel appliance cover that covers an upper portion of the fuel appliances, and an opening is formed in the fuel appliance cover. In this fifth aspect, the fuel appliance cover that covers the upper portion of the fuel appliances can prevent the hydrogen tank and the fuel cell device from being exposed to foreign matter such as rainwater and dust, and even if hydrogen leaks, the hydrogen moves upward in the air and is easily discharged to the outside of the work machine through the opening in the fuel appliance cover.

[0014] A sixth aspect is preferably the work machine according to any one of the first to fifth aspects further comprising the following configuration. That is, the work machine according to the sixth aspect may further comprise another equipment group arranged between the fuel equipment group and the high-voltage equipment group. In this sixth aspect, the area in which the fuel equipment group is arranged and the area in which the high-voltage equipment group is arranged can be separated by the other equipment group.

[0015] A seventh aspect is preferably the work machine according to any one of the first to sixth aspects further comprising the following configuration. That is, the work machine according to the seventh aspect may further comprise another equipment group arranged between the fuel equipment group and the hydraulic equipment group. In this seventh aspect, the area in which the fuel equipment group is arranged and the area in which the hydraulic equipment group is arranged can be separated by the other equipment group.

[0016] An eighth aspect may be the work machine according to any one of the first to seventh aspects, further comprising the following configuration. That is, the work machine according to the eighth aspect preferably further comprises a partition wall disposed between the fuel equipment group and the high-voltage equipment group. In this eighth aspect, the area in which the fuel equipment group is disposed and the area in which the high-voltage equipment group is disposed can be separated by the partition wall.

[0017] A ninth aspect may be the work machine according to any one of the first to eighth aspects, further comprising the following configuration. That is, the work machine according to the ninth aspect preferably further comprises a partition wall arranged between the fuel equipment group and the hydraulic equipment group. In this ninth aspect, the area in which the fuel equipment group is arranged and the area in which the hydraulic equipment group is arranged can be separated by the partition wall.

[0018] A tenth aspect may be the work machine according to any one of the first to ninth aspects, further comprising the following configuration. That is, the work machine according to the tenth aspect further comprises a cooling fan that forms a flow of cooling air, the fuel tank is a hydrogen tank that stores hydrogen, and the hydrogen tank is preferably disposed downstream of the high-voltage equipment group in the flow direction of the cooling air. In this tenth aspect, even if hydrogen leaks, the hydrogen will move along the flow direction of the cooling air in the direction opposite to the direction toward the high-voltage equipment group, and be discharged to the outside of the work machine.

[0019] An eleventh aspect may further include the following configuration in the work machine according to the tenth aspect. That is, in the work machine according to the eleventh aspect, it is preferable that the hydrogen tank is disposed downstream of the hydraulic equipment group in the flow direction of the cooling air. In this eleventh aspect, even if hydrogen leakage occurs, the hydrogen will move along the flow direction of the cooling air in the opposite direction to the hydraulic equipment group and be discharged to the outside of the work machine.

[0020] A twelfth aspect is preferably the work machine according to any one of the first to eleventh aspects further comprising the following configuration. That is, in the work machine according to the twelfth aspect, it is preferable that the fuel equipment group is arranged at a height equal to or higher than the height at which the high-voltage equipment group is arranged. In other words, it is preferable that the fuel equipment group is not arranged lower than the high-voltage equipment group. In this twelfth aspect, since the fuel equipment group is not arranged lower than the high-voltage equipment group, even if the fuel tank is a hydrogen tank and hydrogen leaks, the hydrogen moves upward in the air without being hindered from moving to the high-voltage equipment group and is discharged to the outside of the work machine. In this twelfth aspect, the high-voltage equipment group and the hydraulic equipment group may be arranged at positions shifted from each other in the horizontal direction. In other words, the high-voltage equipment group and the hydraulic equipment group may be arranged so as not to overlap each other in a plan view.

[0021] A thirteenth aspect may further include the following configuration in the work machine according to the twelfth aspect. That is, in the work machine according to the thirteenth aspect, it is preferable that the fuel equipment group is arranged at a height equal to or higher than the height at which the hydraulic equipment group is arranged. In other words, it is preferable that the fuel equipment group is not arranged lower than the hydraulic equipment group. In this thirteenth aspect, since the fuel equipment group is not arranged lower than the hydraulic equipment group, even if hydrogen leaks, the hydrogen will move upward in the air without being impeded from moving to the hydraulic equipment group, and will be discharged to the outside of the work machine.

[0022] A work machine according to a fourteenth aspect includes a fuel equipment group including a fuel tank and a fuel cell device, a high-voltage equipment group, and a hydraulic equipment group, and the fuel equipment group is disposed at a height equal to or higher than the height at which the high-voltage equipment group is disposed. In this fourteenth aspect, since the fuel equipment group is not disposed lower than the high-voltage equipment group, even if the fuel tank is a hydrogen tank and hydrogen leaks, the hydrogen will move upward in the air without being impeded from moving to the high-voltage equipment group, and will be discharged to the outside of the work machine.

[0023] A fifteenth aspect is preferably the work machine according to the fourteenth aspect further comprising the following configuration. That is, in the work machine according to the fifteenth aspect, the fuel equipment group is preferably arranged at a height equal to or higher than the height at which the hydraulic equipment group is arranged. In this fifteenth aspect, since the fuel equipment group is not arranged lower than the hydraulic equipment group, even if hydrogen leakage occurs, the hydrogen moves upward through the air without being hindered by the hydraulic equipment group, and is discharged to the outside of the work machine. In the work machine according to the fifteenth aspect, the high-voltage equipment group and the hydraulic equipment group may be arranged at positions shifted from each other in the horizontal direction. In other words, the high-voltage equipment group and the hydraulic equipment group may be arranged so as not to overlap each other in a plan view.

[0024] A sixteenth aspect may further include the following configuration in the work machine according to the fourteenth or fifteenth aspect. That is, in the work machine according to the sixteenth aspect, the fuel tank is a hydrogen tank that stores hydrogen, and the hydrogen tank is preferably located at a higher position than the high voltage equipment group and the hydraulic equipment group. In this sixteenth aspect, since the hydrogen tank is located at a higher position than the high voltage equipment group and the hydraulic equipment group, even if hydrogen leaks, the hydrogen will move upward, which is the opposite direction to the direction toward the high voltage equipment group and the hydraulic equipment group, and be discharged to the outside of the work machine. Effect of the Invention

[0025] According to the present disclosure, a work machine is provided in which hydraulic equipment, fuel equipment and high-voltage equipment can be efficiently arranged in a limited space on a rotating frame. [Brief description of the drawings]

[0026] [Figure 1] FIG. 1 is a left side view showing a work machine according to an embodiment. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a perspective view of an upper rotating body of the work machine as viewed diagonally from the rear left. [Figure 4] FIG. 2 is a perspective view of an upper rotating body of the work machine as viewed diagonally from the front right. [Diagram 5] FIG. 2 is a plan view showing a fuel-related area, a high-voltage-related area, a hydraulic-related area, and a cooling-related area on a rotating frame of the upper rotating body. [Figure 6] FIG. 2 is a diagram showing the inside of a machine room of the working machine, and is a cross-sectional view taken along line AA in FIG. [Figure 7] 4 is a perspective view showing a positional relationship between a fuel device group and a high-voltage device group in the machine room. FIG. [Figure 8] FIG. 4 is a diagram showing the inside of a machine room in a work machine according to a first modified example of the embodiment. [Figure 9] FIG. 11 is a diagram showing the inside of a machine room in a work machine according to a second modification of the embodiment. [Figure 10] FIG. 11 is a view showing the inside of a machine room in a work machine according to a third modified example of the embodiment. [Figure 11] FIG. 11 is a view showing the inside of a machine room in a work machine according to a fourth modified example of the embodiment. [Figure 12] FIG. 2 is a block diagram showing a fuel device group, a high-voltage device group, and a hydraulic device group. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] A work machine 100 according to an embodiment of the present disclosure will be described with reference to the drawings.

[0028] As shown in Figures 1 and 2, the work machine 100 includes a lower travelling body 1 including a travelling device, an upper rotating body 2 supported by the lower travelling body 1 so as to be rotatable relative to the lower travelling body 1 about a vertically extending rotation axis Z, and a work device 3 supported by the upper rotating body 2. The work machine 100 according to this embodiment is a hydraulic excavator, but the work machine in this disclosure is not limited to hydraulic excavators and may be other work machines such as a crane or a bulldozer. The travelling device may be a crawler type travelling device as shown in Figure 1, or may be a travelling device having tires (not shown).

[0029] The working device 3 includes a boom 4 that is attached to the upper rotating body 2 so as to be able to rise and fall, an arm 5 that is attached to the boom 4 so as to be able to rotate, and a tip attachment 6 that is attached to the arm 5 so as to be able to rotate. In this embodiment, the tip attachment 6 is a bucket, but the tip attachment may be another tip attachment such as a grapple, a fork, a crusher, or the like.

[0030] The upper rotating body 2 includes a rotating frame 20, a cab 11 supported by the rotating frame 20, a counterweight 12, and an outer wall 13. The outer wall 13 has, for example, a box shape and defines a machine room 14. Various components are housed inside the machine room 14. The various components housed in the machine room 14 will be described later.

[0031] The swivel frame 20 is a member supported on the lower traveling body 1 so as to be rotatable. The swivel frame 20 includes a frame main body 21 and a rising body 22. The frame main body 21 supports the cab 11, the counterweight 12, and the outer wall 13. The rising body 22 supports the boom 4 so that it can be raised and lowered. The rising body 22 includes a boom mounting part 22A to which the base end part 4A of the boom 4 shown by the dashed line in FIG. 1 is attached. The boom mounting part 22A constitutes the front part of the rising body 22.

[0032] 3 to 5, the cab 11 is disposed, for example, at the left front portion of the frame body 21. The counterweight 12 is a weight for balancing, and is disposed at the rear portion of the frame body 21 or behind the frame body 21. A driver's seat, operating levers, operating pedals, etc. are disposed in the cab 11.

[0033] 1, the rising body 22 has a shape that stands up from the frame main body 21 and extends in the front-rear direction. The rising body 22 includes a rear portion 22B located rearward of the boom mounting portion 22A (front portion). The rear portion 22B is located rearward of the boom mounting portion 22A and is lower in height than the boom mounting portion 22A. Note that the rear portion 22B of the rising body 22 can be omitted.

[0034] In this embodiment, as shown in Fig. 1 and Fig. 5, the rising body 22 includes left and right rising plates 23, 23 that face each other at a distance from each other on the left and right. Each of the left and right rising plates 23, 23 is a plate-like member that stands from the frame main body 21 and extends in the front-rear direction from the front end to the rear end. As shown in Fig. 4, each of the left and right rising plates 23 has an insertion hole 23A through which a connecting pin that rotatably connects the base end of the boom cylinder 7 is inserted, and an insertion hole 23B through which a connecting pin that rotatably connects the base end 4A of the boom 4 is inserted.

[0035] The work machine 100 is equipped with a plurality of actuators. Each of the plurality of actuators operates by receiving a supply of hydraulic oil discharged from a hydraulic pump 62 (see FIG. 5) described below. The plurality of actuators include a boom cylinder 7 for raising and lowering the boom 4, an arm cylinder 8 for rotating the arm 5, a tip attachment cylinder 9 for rotating the tip attachment 6, and a hydraulic motor 64 (see FIG. 5) for rotating the upper rotating body 2 relative to the lower traveling body 1.

[0036] The machinery room 14 is formed in a space on the upper surface of the frame body 21 excluding an area where the cab 11 is disposed, an area where the base end 4A of the boom 4 is attached, and an area where the counterweight 12 is disposed. The machinery room 14 is formed, for example, in a space behind the cab 11 and a space to the side (for example, to the right) of the cab 11.

[0037] Specifically, as shown in Figures 3 to 5, the machine room 14 includes a rear machine room 14A and a side machine room 14B. The rear machine room 14A is an accommodation space formed behind the cab 11 and along the back surface of the upper rotating body 2. The side machine room 14B is an accommodation space formed to the side (e.g., to the right) of the cab 11 and along the side surface (e.g., right side surface) of the upper rotating body 2. When the weight of the equipment accommodated inside the rear machine room 14A is large, the counterweight 12 can be omitted.

[0038] The exterior wall 13 includes a rear exterior wall 13A that defines a rear machine room 14A, and a side exterior wall 13B that defines a side machine room 14B. Each of the rear exterior wall 13A and the side exterior wall 13B has, for example, a box shape.

[0039] As shown in Figs. 1 to 6, an air intake port 16 and an exhaust port 17 are formed in the outer wall 13. The air intake port 16 is an opening for drawing air outside the machine room 14 into the inside of the machine room 14 as cooling air CA (see Fig. 6). The exhaust port 17 is an opening for discharging the cooling air CA inside the machine room 14 to the outside of the machine room 14. The locations where the air intake port 16 and the exhaust port 17 are formed are not particularly limited, but in this embodiment, the air intake port 16 is formed in a side part (e.g., a right side part) of the outer wall 13, and the exhaust port 17 is formed in the other side part (e.g., a left side part) of the outer wall 13.

[0040] The outer wall 13 may further include a weight outer wall 13C that covers the counterweight 12. However, the weight outer wall 13C may be a part of the counterweight itself. Also, the weight outer wall 13C may be a part of the rear outer wall 13A.

[0041] The work machine 100 includes a plurality of equipment groups and a plurality of connecting members. Each of the plurality of connecting members is a member such as a pipe or a cable for connecting the equipment included in the equipment group corresponding to the connecting member. As shown in Fig. 5, the plurality of equipment groups includes a fuel equipment group 40, a high-voltage equipment group 50, and a hydraulic equipment group 60, and the plurality of connecting members includes at least one fuel pipe, at least one high-voltage cable, and at least one hydraulic pipe. The plurality of equipment groups may further include a cooling equipment group 70.

[0042] 5, in this embodiment, the fuel equipment group 40 and at least one fuel pipe are arranged in a fuel-related area 400 surrounded by a dashed line, the high-voltage equipment group 50 and the at least one high-voltage cable are arranged in a high-voltage-related area 500 surrounded by a dashed line, and the hydraulic equipment group 60 and at least one hydraulic pipe are arranged in a hydraulic-related area 600 surrounded by a dashed line. In addition, the cooling equipment group 70 is arranged in a cooling-related area 700 surrounded by a dashed line.

[0043] [Fuel equipment group] The fuel equipment group 40 includes a hydrogen tank 41, a fuel cell device 42, and a hydrogen fill port 43. The at least one fuel pipe includes a fuel pipe 40A that connects the hydrogen tank 41 and the fuel cell device 42, and a fuel pipe 40B (hydrogen fill pipe) for connecting the hydrogen fill port 43 to the hydrogen tank 41.

[0044] The hydrogen tank 41 is a container for storing hydrogen. The hydrogen tank 41 is an example of a fuel tank. Note that, when the fuel cell device 42 generates power using a fuel other than hydrogen, the fuel tank may be a container for storing a fuel other than hydrogen. In this embodiment, the hydrogen tank 41 is disposed above the fuel cell device 42.

[0045] High-pressure hydrogen stored in hydrogen tank 41 is supplied to a pressure reducing valve (not shown) via fuel piping 40A, and is reduced in pressure by the pressure reducing valve. The reduced-pressure hydrogen (hydrogen gas) is supplied to fuel cell device 42 via fuel piping 40A. Hydrogen tank 41 may be, for example, a resin tank. An example of a resin tank is a type 4 resin tank. Type 4 resin tanks are made of a resin container with carbon fiber reinforced plastic wrapped around the outside, and are highly strong. However, hydrogen tank 41 is not limited to type 4 resin tanks, and may be other resin tanks or tanks made of materials other than resin.

[0046] The fuel cell device 42 includes a fuel cell that generates electric power by electrochemically reacting hydrogen (hydrogen gas) supplied from a hydrogen tank 41 with oxygen (for example, oxygen contained in air). The fuel cell is formed of, for example, a fuel cell stack including a plurality of cells.

[0047] As shown in FIGS. 6 and 7, the hydrogen tank 41 of the fuel equipment group 40 may be supported by a support member 90 in the machine room 14.

[0048] 5 and 12, hydrogen fill port 43 is connected to hydrogen tank 41 via fuel pipe 40B (hydrogen fill pipe). Fuel pipe 40B may extend from hydrogen fill port 43 and be directly connected to hydrogen tank 41. Alternatively, fuel pipe 40B may extend from hydrogen fill port 43 and be connected to another pipe such as fuel pipe 40A, and be connected to hydrogen tank 41 via this other pipe. Hydrogen fill port 43 has a fill opening that communicates with fuel pipe 40B.

[0049] The hydrogen filling port 43 is disposed, for example, near the hydrogen tank 41. As shown in Fig. 4, the outer wall 13 has a filling door 18 formed in a position adjacent to the hydrogen filling port 43. In the specific example shown in Fig. 4, the filling door 18 is formed on the front surface of the rear outer wall 13A of the outer wall 13, but the position where the filling door 18 is formed is not limited to the specific example shown in Fig. 4.

[0050] When the filling door 18 is closed, the hydrogen filling port 43 is covered by the outer wall 13 including the filling door 18, and is not exposed to the outside. Therefore, when the hydrogen filling operation is not being performed to fill the hydrogen tank 41 with hydrogen, it is possible to prevent foreign matter such as dust from adhering to the hydrogen filling port 43. During the hydrogen filling operation to fill the hydrogen tank 41 with hydrogen, the filling door 18 is opened to make it possible to connect a nozzle of a hydrogen gas filling device (not shown) to the hydrogen filling port 43, and the nozzle of the hydrogen gas filling device is connected to the hydrogen filling port 43 to fill the hydrogen tank 41 with hydrogen. When filling of the hydrogen tank 41 is completed, the nozzle of the hydrogen gas filling device is removed from the hydrogen filling port 43, and the filling door 18 is closed.

[0051] As shown in FIG. 4, a handrail 91 is provided on the outer wall 13. This handrail 91 is used when a worker performs a filling operation. The worker can efficiently perform the filling operation while stabilizing his / her posture by holding the handrail 91. The handrail 91 is provided in a portion of the outer wall 13 near the filling opening and closing door 18. In the specific example shown in FIG. 4, the worker performs the filling operation on the filling operation surface 133, which is the upper surface of the outer wall 13 located in front of the filling opening and closing door 18, so the handrail 91 is provided at the end of this filling operation surface 133 (the right end in FIG. 4). The outer wall 13 further has an upper surface 132 that is adjacent to the filling operation surface 133 (the position in front of the filling operation surface 133 in FIG. 4), lower than the filling operation surface 133, and higher than the ground, so that the worker can easily ascend from the ground to the filling operation surface 133 via the upper surface 132, and can easily descend from the filling operation surface 133 to the ground via the upper surface 132.

[0052] [High voltage equipment] The high-voltage equipment group 50 includes an inverter 51 and an electric motor 52. The inverter 51 is an example of a first high-voltage equipment, and the electric motor 52 is an example of a second high-voltage equipment. The at least one high-voltage cable includes a high-voltage cable 50C that connects the inverter 51 and the electric motor 52.

[0053] The inverter 51 is connected to the fuel cell device 42. The inverter 51 converts the direct current supplied from the fuel cell device 42 into a three-phase alternating current and supplies it to the electric motor 52. The inverter 51 adjusts the rotation speed of the electric motor 52.

[0054] The electric motor 52 is a drive source that drives a hydraulic pump 62, which will be described later. The electric motor 52 operates by receiving a supply of electric power from the fuel cell device 42 via an inverter 51. The electric motor 52 is formed of, for example, a three-phase motor.

[0055] The high-voltage equipment group 50 may further include a battery 53. The battery 53 may be, for example, a lithium-ion battery or another type of battery. The electric motor 52 may be operated by receiving power output from the battery 53 via an inverter 51. The inverter 51 may convert the direct current supplied from the battery 53 into a three-phase alternating current and supply it to the electric motor 52. The battery 53 may also be charged by receiving power from the fuel cell device 42.

[0056] The high-voltage equipment group 50 may further include a repeater 55 (junction box 55). As shown in Fig. 12, the repeater 55 has a function of combining the power output by the fuel cell device 42 and the power output by the battery 53, and a function of distributing the power to a plurality of high-voltage devices such as the inverter 51 and a converter 54 described below. In this embodiment, the fuel cell device 42 is connected to the repeater 55 via a power supply cable 101.

[0057] The high-voltage equipment group 50 may further include a converter 54 (DCDC converter). The converter 54 steps down the high voltage output from the repeater 55. The converter 54 supplies the stepped-down low-voltage power to the low-voltage equipment group. In the specific example shown in FIG. 12, the low-voltage equipment group includes a cooling fan 71, a water pump, a controller, and a lead battery. The cooling fan 71 will be described later. The water pump circulates cooling water between the fuel cell device 42 and a radiator 73, which will be described later, through radiator hoses 107, 108, which will be described later. The controller controls the operation of the work machine 100. However, the low-voltage equipment group is not limited to these specific examples.

[0058] As shown in FIG. 12, the at least one high-voltage cable may further include, in addition to high-voltage cable 50C connecting inverter 51 and electric motor 52, high-voltage cable 50A connecting battery 53 and repeater 55, high-voltage cable 50B connecting repeater 55 and inverter 51, and high-voltage cable 50D connecting repeater 55 and converter 54.

[0059] Moreover, the high-voltage equipment group 50 may further include a compressor (not shown) and may further include a heater (not shown). The compressor is, for example, a device that compresses vaporized refrigerant, and is included in an air conditioning device for adjusting the temperature inside the cab 11. The heater may include at least one of an electric heater constituting a heating device for heating the inside of the cab 11, an electric heater for preheating the battery 53, and an electric heater for preheating the hydraulic oil.

[0060] [Hydraulic equipment] The hydraulic equipment group 60 includes a hydraulic oil tank 61 and a hydraulic pump 62. The hydraulic oil tank 61 is an example of a first hydraulic equipment, and the hydraulic pump 62 is an example of a second hydraulic equipment. The at least one hydraulic pipe includes a hydraulic pipe 60A that connects the hydraulic oil tank 61 and the hydraulic pump 62.

[0061] The hydraulic oil tank 61 is a container for storing hydraulic oil. The hydraulic pump 62 is driven by the electric motor 52 to discharge hydraulic oil. The hydraulic pump 62 is connected to the electric motor 52 via a shaft connection coupling 110.

[0062] The hydraulic equipment group 60 may further include a control valve 63 and a hydraulic motor 64. In this case, the at least one hydraulic pipe may further include a hydraulic pipe 60B connecting the hydraulic pump 62 and the control valve 63, and a hydraulic pipe 60C connecting the control valve 63 and the hydraulic motor 64. The hydraulic motor 64 is operated by receiving a supply of hydraulic oil from the hydraulic pump 62 via the control valve 63. The control valve 63 opens and closes in response to a lever operation or pedal operation applied by the operator to an operation device (not shown) so that the hydraulic oil from the hydraulic pump 62 is supplied to an actuator (e.g., the hydraulic motor 64) corresponding to the operation.

[0063] [Cooling equipment group] The cooling equipment group 70 includes a cooling fan 71 and a heat exchanger. The heat exchanger may include at least one of an oil cooler 72 and a radiator 73.

[0064] The cooling fan 71 forms a flow of cooling air CA in the machine room 14. That is, the cooling fan 71 forms a flow of cooling air CA in the machine room 14 from the intake port 16 to the exhaust port 17. As shown in FIG. 6, the cooling fan 71 has an impeller 711 including a rotating shaft portion and a plurality of blade portions arranged along the outer periphery of the rotating shaft portion, and a fan motor 712 that drives the impeller 711. The impeller 711 of the cooling fan 71 rotates when power is supplied to the fan motor 712 from the fuel cell device 42 or the battery 53 via the repeater 55, for example. The cooling fan 71 may further have a shroud 713 arranged to surround the impeller 711.

[0065] The oil cooler 72 may be configured to cool the hydraulic oil discharged from the devices included in the hydraulic equipment group 60. Specifically, for example, the oil cooler 72 may be connected to the control valve 63 via an oil cooler hose 104, and may be connected to the hydraulic oil tank 61 via an oil cooler hose 105. In this case, the hydraulic oil discharged from the control valve 63 reaches the oil cooler 72 via the oil cooler hose 104, is cooled by heat exchange with the cooling air CA in the oil cooler 72, and flows into the hydraulic oil tank 61 via the oil cooler hose 105. This cools the hydraulic oil.

[0066] The radiator 73 may be configured to cool the fuel cell device 42. Specifically, for example, the radiator 73 may be connected to the fuel cell device 42 via radiator hoses 107 and 108. Cooling water is circulated between the fuel cell device 42 and the radiator 73 by the water pump. The cooling water reaches the radiator 73 via the radiator hose 107, is cooled by exchanging heat with the cooling air CA in the radiator 73, and is supplied to the fuel cell device 42 via the radiator hose 108, whereby the fuel cell device 42 is cooled by the cooling water. The cooling water that has passed through the fuel cell device 42 returns to the radiator 73 via the radiator hose 107.

[0067] Next, the arrangement of the devices and connecting members in the fuel-related area 400, the high-voltage-related area 500, the hydraulic-related area 600, and the cooling-related area 700 will be specifically described.

[0068] [First feature] The work machine 100 according to this embodiment has a first feature as follows. Each of the fuel pipes 40A, 40B is disposed at a position offset from a high-voltage device inter-space 50S, which is a space between the high-voltage devices included in the high-voltage device group 50, and is disposed at a position offset from a hydraulic device inter-space 60S, which is a space between the hydraulic devices included in the hydraulic device group 60. Each of the high-voltage cables 50A, 50B, 50C, 50D is disposed at a position offset from a fuel device inter-space 40S, which is a space between the fuel devices included in the fuel device group 40, and is disposed at a position offset from the hydraulic device inter-space 60S. Each of the hydraulic pipes 60A, 60B, 60C is disposed at a position offset from the fuel device inter-space 40S, and is disposed at a position offset from the high-voltage device inter-space 50S.

[0069] In this embodiment having the first characteristic, the high-voltage cables 50A, 50B, 50C, 50D and the hydraulic pipes 60A, 60B, 60C are not interposed between the fuel equipment included in the fuel equipment group 40, so that the intervals between the fuel equipment are prevented from becoming large due to the high-voltage cables 50A, 50B, 50C, 50D and the hydraulic pipes 60A, 60B, 60C. Specifically, the intervals between the hydrogen tank 41 and the fuel cell device 42, which are arranged adjacent to each other, and the intervals between the hydrogen tank 41 and the hydrogen fill port 43, which are arranged adjacent to each other, are prevented from becoming large due to the high-voltage cables 50A, 50B, 50C, 50D and the hydraulic pipes 60A, 60B, 60C. This prevents the space required for installing the fuel equipment group 40 from becoming large.

[0070] In addition, since the fuel pipes 40A, 40B and the hydraulic pipes 60A, 60B, 60C are not interposed between the high-voltage devices included in the high-voltage device group 50, the intervals between the high-voltage devices are prevented from increasing due to the fuel pipes 40A, 40B and the hydraulic pipes 60A, 60B, 60C. Specifically, the intervals between the inverter 51 and the electric motor 52 arranged adjacent to each other, the intervals between the battery 53 and the relay 55 arranged adjacent to each other, the intervals between the relay 55 and the inverter 51 arranged adjacent to each other, the intervals between the relay 55 and the converter 54 arranged adjacent to each other, and the intervals between the inverter 51 and the converter 54 arranged adjacent to each other are prevented from increasing due to the fuel pipes 40A, 40B and the hydraulic pipes 60A, 60B, 60C. This prevents the space required for installing the high-voltage device group 50 from increasing.

[0071] Furthermore, since the fuel pipes 40A, 40B and the high-voltage cables 50A, 50B, 50C, and 50D are not interposed between the hydraulic devices included in the hydraulic device group 60, the intervals between the hydraulic devices are prevented from becoming large due to the fuel pipes 40A, 40B and the high-voltage cables 50A, 50B, 50C, and 50D. Specifically, the intervals between the hydraulic oil tank 61 and the hydraulic pump 62, which are arranged adjacent to each other, and the intervals between the control valve 63 and the hydraulic motor 64, which are arranged adjacent to each other, are prevented from becoming large due to the fuel pipes 40A, 40B and the high-voltage cables 50A, 50B, 50C, and 50D. This prevents the space required for installing the hydraulic device group 60 from becoming large.

[0072] Therefore, in this embodiment having the first characteristic, the fuel equipment group 40, the high-voltage equipment group 50, and the hydraulic equipment group 60 can be efficiently arranged in the limited space on the revolving frame 20.

[0073] The space between the fuel devices 40S is the space between two fuel devices. Specifically, when the two fuel devices are arranged vertically, it is the space between the bottom surface of the upper fuel device and the top surface of the lower fuel device, when the two fuel devices are arranged horizontally, it is the space between the right side surface of the left fuel device and the left side surface of the right fuel device, and when the two fuel devices are arranged front to back, it is the space between the rear surface of the front fuel device and the front surface of the rear fuel device.

[0074] The space between the high-voltage devices 50S is the space between two high-voltage devices. Specifically, when the two high-voltage devices are arranged vertically, it is the space between the lower surface of the upper high-voltage device and the upper surface of the lower high-voltage device, when the two high-voltage devices are arranged horizontally, it is the space between the right side surface of the left high-voltage device and the left side surface of the right high-voltage device, and when the two high-voltage devices are arranged front-to-back, it is the space between the rear surface of the front high-voltage device and the front surface of the rear high-voltage device.

[0075] The space between hydraulic devices 60S is the space between two hydraulic devices. Specifically, when the two hydraulic devices are arranged vertically, it is the space between the lower surface of the upper hydraulic device and the upper surface of the lower hydraulic device, when the two hydraulic devices are arranged horizontally, it is the space between the right side surface of the left hydraulic device and the left side surface of the right hydraulic device, and when the two hydraulic devices are arranged front-to-back, it is the space between the rear surface of the front hydraulic device and the front surface of the rear hydraulic device.

[0076] In this embodiment, in the machinery chamber 14, as shown in Figures 6 and 12, a fuel equipment space 40S between the hydrogen tank 41 and the fuel cell device 42, and a fuel equipment space 40S between the hydrogen tank 41 and the hydrogen filling port 43 are formed.

[0077] In this embodiment, as shown in Figures 5 and 12, the machine room 14 is provided with a high-voltage equipment space 50S between the inverter 51 and the electric motor 52, a high-voltage equipment space 50S between the battery 53 and the repeater 55, a high-voltage equipment space 50S between the repeater 55 and the inverter 51, a high-voltage equipment space 50S between the repeater 55 and the converter 54, and a high-voltage equipment space 50S between the inverter 51 and the converter 54.

[0078] In this embodiment, as shown in Fig. 5 and Fig. 12, the machine room 14 is provided with a hydraulic device space 60S between the hydraulic oil tank 61 and the hydraulic pump 62, and a hydraulic device space 60S between the control valve 63 and the hydraulic motor 64. In this embodiment, the hydraulic related area 600 includes a first hydraulic related area 600A and a second hydraulic related area 600B, in which the hydraulic oil tank 61 and the hydraulic pump 62 are disposed, and in which the control valve 63 and the hydraulic motor 64 are disposed, in the second hydraulic related area 600B. In the specific example shown in Fig. 5, the first hydraulic related area 600A is located at the right front of the revolving frame 20, and the second hydraulic related area 600B is located at the front of the revolving frame 20 in the center in the left-right direction. When the first hydraulic-related area 600A and the second hydraulic-related area 600B are adjacent to each other, the inter-hydraulic device space 60S may include an inter-hydraulic device space between a hydraulic device (e.g., hydraulic pump 62) arranged in the first hydraulic-related area 600A and a hydraulic device (e.g., hydraulic motor 64) arranged in the second hydraulic-related area 600B. The hydraulic piping 60B may connect the hydraulic pump 62 and the control valve 63 by being arranged so as to be inserted into a through-hole provided in the upright plate 23 of the upright block 22, for example.

[0079] [Second feature] The work machine 100 according to this embodiment has a second feature as follows. Each of the fuel pipes 40A, 40B is disposed at a position offset from the high-voltage-related area 500 in which the high-voltage equipment group 50 and the high-voltage cables 50A, 50B, 50C, 50D are disposed, and is disposed at a position offset from the hydraulic-related area 600 in which the hydraulic equipment group 60 and the hydraulic pipes 60A, 60B, 60C are disposed. Each of the high-voltage cables 50A, 50B, 50C, 50D is disposed at a position offset from the fuel-related area 400 in which the fuel equipment group 40 and the fuel pipes 40A, 40B are disposed, and is disposed at a position offset from the hydraulic-related area 600. Each of the hydraulic pipes 60A, 60B, 60C is disposed at a position offset from the fuel-related area 400, and is disposed at a position offset from the high-voltage-related area 500.

[0080] In the present embodiment having the second feature, high-voltage cables 50A, 50B, 50C, 50D and hydraulic pipes 60A, 60B, 60C are not arranged in the fuel-related area 400, so not only is the spacing between the fuel devices prevented from becoming large due to the high-voltage cables 50A, 50B, 50C, 50D and the hydraulic pipes 60A, 60B, 60C, but also the length of each of the fuel pipes 40A, 40B is prevented from becoming large due to the high-voltage cables 50A, 50B, 50C, 50D and the hydraulic pipes 60A, 60B, 60C. This prevents the fuel-related area 400 from becoming large.

[0081] Furthermore, since fuel pipes 40A, 40B and hydraulic pipes 60A, 60B, 60C are not arranged in high-voltage related area 500, not only is the distance between the high-voltage devices prevented from increasing due to fuel pipes 40A, 40B and hydraulic pipes 60A, 60B, 60C, but the lengths of high-voltage cables 50A, 50B, 50C, 50D are also prevented from increasing due to fuel pipes 40A, 40B and hydraulic pipes 60A, 60B, 60C. This prevents high-voltage related area 500 from becoming large.

[0082] Furthermore, since fuel pipes 40A, 40B and high-voltage cables 50A, 50B, 50C, and 50D are not arranged in hydraulic pressure-related area 600, not only is the distance between hydraulic devices prevented from increasing due to fuel pipes 40A, 40B and high-voltage cables 50A, 50B, 50C, and 50D, but the lengths of hydraulic pipes 60A, 60B, and 60C are also prevented from increasing due to fuel pipes 40A, 40B and high-voltage cables 50A, 50B, 50C, and 50D. This prevents hydraulic pressure-related area 600 from becoming large.

[0083] Therefore, in this embodiment having the second feature, the fuel equipment group 40, the high-voltage equipment group 50, and the hydraulic equipment group 60 are arranged more efficiently in the limited space on the revolving frame 20.

[0084] The fuel-related area 400 may include an area occupied by the fuel devices included in the fuel device group 40, an area occupied by the fuel pipes, and the space between the fuel devices 40S. The fuel pipes may be disposed in the space between the fuel devices 40S, or a part or all of the fuel pipes may be disposed at a position offset from the space between the fuel devices 40S. When a part or all of the fuel pipes are disposed at a position offset from the space between the fuel devices 40S, the fuel-related area 400 may include an area occupied by the fuel devices included in the fuel device group 40, an area occupied by the fuel pipes, the space between the fuel devices 40S, and the space between the fuel pipes and the fuel devices disposed adjacent to each other.

[0085] The high-voltage related area 500 may include an area occupied by high-voltage equipment included in the high-voltage equipment group 50, an area occupied by high-voltage cables, and a space between high-voltage equipment 50S. The high-voltage cables may be disposed in the space between high-voltage equipment 50S, or a part or all of the high-voltage cables may be disposed in a position shifted from the space between high-voltage equipment 50S. When a part or all of the high-voltage cables are disposed in a position shifted from the space between high-voltage equipment 50S, the high-voltage related area 500 may include an area occupied by high-voltage equipment included in the high-voltage equipment group 50, an area occupied by high-voltage cables, the space between high-voltage equipment 50S, and a space between the high-voltage cables and high-voltage equipment disposed adjacent to each other.

[0086] The hydraulic-related area 600 may include an area occupied by hydraulic devices included in the hydraulic device group 60, an area occupied by hydraulic piping, and an inter-hydraulic device space 60S. The hydraulic piping may be arranged in the inter-hydraulic device space 60S, or a part or all of the hydraulic piping may be arranged in a position offset from the inter-hydraulic device space 60S. When a part or all of the hydraulic piping is arranged in a position offset from the inter-hydraulic device space 60S, the hydraulic-related area 600 may include an area occupied by hydraulic devices included in the hydraulic device group 60, an area occupied by hydraulic piping, the inter-hydraulic device space 60S, and a space between the hydraulic piping and hydraulic devices arranged next to each other.

[0087] [Third feature] The work machine 100 according to this embodiment has a third feature as follows: The fuel equipment group 40 is disposed at a position offset from the high-voltage related area 500 and the hydraulic pressure related area 600, the high-voltage equipment group 50 is disposed at a position offset from the fuel related area 400 and the hydraulic pressure related area 600, and the hydraulic equipment group 60 is disposed at a position offset from the fuel related area 400 and the high-voltage related area 500.

[0088] In this embodiment having the third feature, not only are the high-voltage cables 50A, 50B, 50C, 50D and the hydraulic pipes 60A, 60B, 60C not arranged in the fuel-related area 400, but also the high-voltage equipment group 50 and the hydraulic equipment group 60 are not arranged, not only are the fuel pipes 40A, 40B and the hydraulic pipes 60A, 60B, 60C not arranged in the high-voltage-related area 500, but also the fuel equipment group 40 and the hydraulic equipment group 60 are not arranged, and not only are the fuel pipes 40A, 40B and the high-voltage cables 50A, 50B, 50C, 50D not arranged in the hydraulic-related area 600, but also the fuel equipment group 40 and the high-voltage equipment group 50 are not arranged. That is, the fuel-related area 400, the high-voltage-related area 500, and the hydraulic-related area 600 are clearly separated. 5, the equipment groups and connecting members (fuel piping, high voltage cables, or hydraulic piping) of the fuel-related area 400, the high-voltage-related area 500, and the hydraulic-related area 600 can be concentrated and arranged in each area. This allows the fuel equipment group 40, the high-voltage equipment group 50, and the hydraulic equipment group 60 to be arranged more efficiently.

[0089] In the plan view of FIG. 5, a portion of the fuel-related area 400 indicated by a dashed line and a portion of the high-voltage-related area 500 indicated by a dashed line are shown overlapping each other, but in reality, these portions are positioned vertically offset from each other as shown in FIG. 6 and FIG. 7.

[0090] [Fourth feature] The work machine 100 according to this embodiment has a fourth feature as follows. As shown in Figures 6 and 7, the hydrogen tank 41 is disposed at a higher position than the high-voltage equipment group 50. The hydrogen tank 41 is also disposed at a higher position than the hydraulic equipment group 60.

[0091] In this embodiment having this fourth feature, the hydrogen tank 41 is positioned higher than the high voltage equipment group 50 and the hydraulic equipment group 60. Therefore, even if a hydrogen gas leak occurs, the hydrogen gas will move upward, which is the opposite direction to the direction toward the high voltage equipment group 50 and the hydraulic equipment group 60 (downward), and be discharged to the outside of the work machine 100.

[0092] [Fifth feature] The working machine 100 according to this embodiment has the following fifth feature: As shown in Figures 3, 4 and 6, the outer wall 13 has a fuel equipment group cover 131 that covers the upper part of the hydrogen tank 41, and the fuel equipment group cover 131 has one or more openings 19 formed therein.

[0093] In this embodiment having this fifth feature, the fuel equipment group cover 131 which covers the top of the fuel equipment group 40 (specifically, the hydrogen tank 41) can prevent the hydrogen tank 41 and the fuel cell device 42 from being exposed to foreign matter such as rainwater and dust, and even if a hydrogen gas leak occurs, the hydrogen gas moves upward through the air and is easily discharged to the outside of the work machine 100 through the opening 19 of the fuel equipment group cover 131.

[0094] The work machine 100 according to this embodiment further has the following features: As shown in Fig. 6, the hydrogen tank 41 is disposed downstream of the high-voltage equipment group 50 in the flow direction of the cooling air CA.

[0095] In this embodiment having this feature, even if a hydrogen gas leak occurs, the hydrogen gas moves along the flow direction of the cooling air CA in the opposite direction (left) from the direction toward the high-voltage equipment group 50 (right), and is discharged to the outside of the work machine 100.

[0096] Furthermore, the work machine 100 according to this embodiment may further have the following feature. That is, the hydrogen tank 41 may be disposed downstream in the flow direction of the cooling air CA from the hydraulic equipment group 60. In this case, even if a hydrogen gas leak occurs, the hydrogen gas will move along the flow direction of the cooling air CA in the direction opposite to the direction toward the hydraulic equipment group 60, and be discharged to the outside of the work machine.

[0097] The work machine 100 according to this embodiment further has the following characteristics. That is, the fuel equipment group 40 is disposed at a height equal to or higher than the height at which the high-voltage equipment group 50 is disposed. In other words, the fuel equipment group 40 is not disposed below the high-voltage equipment group 50. In this embodiment having this characteristic, since the fuel equipment group 40 is not disposed below the high-voltage equipment group 50, even if hydrogen gas leaks, the hydrogen gas moves upward through the air without being hindered by the high-voltage equipment group 50, and is discharged to the outside of the work machine 100. In this embodiment, the high-voltage equipment group 50 and the hydraulic equipment group 60 may be disposed at positions shifted from each other in the horizontal direction, as shown in FIG. 5. In other words, the high-voltage equipment group 50 and the hydraulic equipment group 60 may be disposed so as not to overlap each other in a plan view.

[0098] The work machine 100 according to this embodiment may further have the following features. That is, the fuel equipment group 40 is preferably arranged at a height equal to or higher than the height at which the hydraulic equipment group 60 is arranged. In other words, the fuel equipment group 40 is preferably not arranged below the hydraulic equipment group 60. In this case, since the fuel equipment group 40 is not arranged below the hydraulic equipment group 60, even if a hydrogen gas leak occurs, the hydrogen gas will move upward in the air without being hindered by the hydraulic equipment group 60 and will be discharged to the outside of the work machine 100.

[0099] [Variation 1] Next, a working machine 100 according to Modification 1 of the present embodiment will be described. Fig. 8 is a plan view showing the inside of the machine room 14 in the working machine 100 according to Modification 1.

[0100] As shown in FIG. 8, in the work machine 100 according to the first modification, a cooling-related area 700 is interposed between the fuel-related area 400 and the high-voltage-related area 500. That is, the cooling equipment group 70 of the cooling-related area 700 is arranged between the fuel equipment group 40 of the fuel-related area 400 and the high-voltage equipment group 50 of the high-voltage-related area 500. In this first modification, the fuel-related area 400 in which the fuel equipment group 40 is arranged and the high-voltage-related area 500 in which the high-voltage equipment group 50 is arranged can be separated by the cooling equipment group 70 of the cooling-related area 700. Note that equipment groups other than the cooling equipment group 70 of the cooling-related area 700 may be arranged between the fuel equipment group 40 of the fuel-related area 400 and the high-voltage equipment group 50 of the high-voltage-related area 500. Other equipment groups such as the cooling equipment group 70 may be arranged between the fuel equipment group 40 and the hydraulic equipment group 60. In this case, the fuel-related area 400 in which the fuel equipment group 40 is arranged and the hydraulic equipment-related area 600 in which the hydraulic equipment group 60 is arranged can be separated by the other equipment group.

[0101] [Variation 2] Next, a description will be given of a work machine 100 according to a second modification of this embodiment. Fig. 9 is a plan view showing the inside of the machine room 14 in the work machine 100 according to the second modification.

[0102] 9, in a work machine 100 according to Modification 2, the fuel cell device 42 of the fuel equipment group 40 is disposed inside the machinery room 14, while the hydrogen tank 41 of the fuel equipment group 40 is disposed on top of the cab 11. In this Modification 1, there is more space inside the machinery room 14, making it easier to arrange other equipment in the machinery room 14.

[0103] [Variation 3] Next, a working machine 100 according to Modification 3 of the present embodiment will be described. Fig. 10 is a plan view showing the inside of the machine room 14 in the working machine 100 according to Modification 3.

[0104] As shown in FIG. 10, the work machine 100 according to the third modification includes a partition wall 81 and a partition wall 82. The partition wall 81 is a member disposed between the fuel equipment group 40 and the high-voltage equipment group 50, and the partition wall 82 is a member disposed between the fuel equipment group 40 and the hydraulic equipment group 60. Each of the partition walls 81 and 82 is disposed in such a manner as to stand upward from the frame main body 21 of the revolving frame 20. In the third modification, the fuel-related area 400 in which the fuel equipment group 40 is disposed and the high-voltage-related area 500 in which the high-voltage equipment group 50 is disposed can be separated by the partition wall 81, and the fuel-related area 400 in which the fuel equipment group 40 is disposed and the hydraulic-related area 600 in which the hydraulic equipment group 60 is disposed can be separated by the partition wall 82. Note that in the third modification, one of the partition walls 81 and 82 can be omitted.

[0105] [Variation 4] Next, a working machine 100 according to Modification 4 of the present embodiment will be described. Fig. 11 is a rear view showing the inside of the machine room 14 in the working machine 100 according to Modification 4.

[0106] 11, the work machine 100 according to the fourth modification includes a partition wall 83. In this fourth modification, the fuel equipment group 40 is disposed below the high-voltage equipment group 50, and the partition wall 83 is disposed between the fuel equipment group 40 and the high-voltage equipment group 50. This allows the fuel-related area 400 in which the fuel equipment group 40 is disposed and the high-voltage-related area 500 in which the high-voltage equipment group 50 is disposed to be vertically separated by the partition wall 81.

[0107] In this fourth variant, an intake port 16 and an exhaust port 17 are formed in the portion of the outer wall 13 corresponding to the fuel-related area 400, and a cooling equipment group 70 is disposed between the fuel equipment group 40 and the exhaust port 17.

[0108] [Variation 5] Next, a working machine 100 according to a fifth modification of the present embodiment will be described.

[0109] The work machine 100 according to Modification 5 has the following features. That is, the work machine 100 according to Modification 5 is equipped with a fuel equipment group 40 including a hydrogen tank 41, a fuel cell device 42, and a hydrogen fill port 43, a high-voltage equipment group 50, and a hydraulic equipment group 60, and the fuel equipment group 40 is disposed at a height equal to or higher than the height at which the high-voltage equipment group 50 is disposed. In having this feature, the work machine 100 according to Modification 5 is similar to the work machine 100 according to the embodiment shown in Figures 1 to 7, and other configurations of the work machine 100 according to Modification 5 may differ from those of the work machine 100 according to the embodiment shown in Figures 1 to 7.

[0110] In this variant 5, the fuel equipment group 40 is not positioned below the high-voltage equipment group 50. Therefore, even if a hydrogen leak occurs, the hydrogen gas moves upward through the air without being hindered by the high-voltage equipment group 50, and is discharged to the outside of the work machine 100.

[0111] Furthermore, in the fifth modification, the fuel equipment group 40 may be disposed at a height equal to or higher than the height at which the hydraulic equipment group 60 is disposed. In this case, the fuel equipment group 40 is not disposed lower than the hydraulic equipment group 60. Therefore, even if hydrogen gas leaks, the hydrogen gas moves upward through the air without being hindered by the hydraulic equipment group 60, and is discharged to the outside of the work machine 100. In the fifth modification, the high-voltage equipment group 50 and the hydraulic equipment group 60 may be disposed at positions shifted from each other in the horizontal direction. In other words, the high-voltage equipment group 50 and the hydraulic equipment group 60 may be disposed so as not to overlap each other in a plan view.

[0112] Furthermore, in the fifth modification, the hydrogen tank 41 is preferably disposed at a position higher than the high-voltage equipment group 50 and the hydraulic equipment group 60. In this case, even if hydrogen gas leaks, the hydrogen gas will move upward, which is the opposite direction to the direction toward the high-voltage equipment group 50 and the hydraulic equipment group 60, and be discharged to the outside of the work machine.

[0113] [Other variations] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and further includes, for example, the following modified examples.

[0114] In the above embodiment and modified example, the inverter 51 is an example of a first high-voltage device, the electric motor 52 is an example of a second high-voltage device, the hydraulic oil tank 61 is an example of a first hydraulic device, and the hydraulic pump 62 is an example of a second hydraulic device. However, at least one of the first high-voltage device and the second high-voltage device is not limited to the inverter 51 and the electric motor 52, which are specific examples described in the above embodiment, and may be other high-voltage devices such as a battery 53, a converter 54, and a relay 55. Furthermore, at least one of the first hydraulic device and the second hydraulic device is not limited to the hydraulic oil tank 61 and the hydraulic pump 62, which are specific examples described in the above embodiment, and may be other hydraulic devices such as a control valve 63 and a hydraulic motor 64.

[0115] In the above embodiment and modified example, the high-voltage equipment group 50 includes a repeater 55 (junction box 55), but the repeater 55 is not essential and can be omitted. When the repeater 55 is omitted, the inverter 51 may be directly connected to the fuel cell device 42 via the power supply cable 101, or directly connected to the battery 53 via the high-voltage cable 50A. Similarly, the converter 54 may be directly connected to the fuel cell device 42 via the power supply cable, or directly connected to the battery 53 via the high-voltage cable. [Explanation of symbols]

[0116] 13: Exterior wall 14: Machine room 16: Air intake 17: Exhaust port 40:Fuel equipment group 40A: Fuel pipe 40B:Fuel piping 40S: Space between fuel equipment 41: Hydrogen tank 42: Fuel cell device 43: Hydrogen filling port 50: High voltage equipment 50A: High voltage cable 50B: High voltage cable 50C: High voltage cable 50D: High voltage cable 50S: Space between high voltage devices 51: Inverter 52: Electric motor 53: Battery 54: Converter 55: Repeater (junction box) 60: Hydraulic equipment group 60A: Hydraulic piping 60B: Hydraulic piping 60C: Hydraulic piping 60S: Space between hydraulic devices 61: Hydraulic oil tank 62: Hydraulic pump 63: Control valve 64: Hydraulic motor 70: Cooling equipment group 71: Cooling fan 72: Oil cooler 73: Radiator 81: Bulkhead 82: Bulkhead 83: Bulkhead 100: Working machines 400: Fuel-related area 500: High voltage related area 600: Hydraulic related area

Claims

1. a fuel device group including a fuel tank and a fuel cell device; a high-voltage device group including a first high-voltage device and a second high-voltage device; a hydraulic device group including a first hydraulic device and a second hydraulic device; a fuel pipe connecting the fuel tank and the fuel cell device; a high voltage cable connecting the first high voltage device and the second high voltage device; a hydraulic piping that connects the first hydraulic device and the second hydraulic device, the fuel pipe is disposed at a position offset from a high-voltage device inter-space between the first high-voltage device and the second high-voltage device and from a hydraulic device inter-space between the first hydraulic device and the second hydraulic device, the high voltage cable is disposed at a position offset from a fuel device space and a hydraulic device space between the fuel tank and the fuel cell device, The hydraulic piping is disposed at a position offset from the fuel inter-equipment space and the high voltage inter-equipment space.

2. the fuel piping is disposed at a position offset from a high-voltage-related area in which the high-voltage equipment group and the high-voltage cable are disposed and from a hydraulic-related area in which the hydraulic equipment group and the hydraulic piping are disposed, the high voltage cable is disposed at a position offset from a fuel-related area and a hydraulic-related area in which the fuel equipment group and the fuel pipes are disposed, The work machine of claim 1 , wherein the hydraulic lines are positioned offset from the fuel related area and the high voltage related area.

3. the fuel equipment group is disposed at a position offset from the high voltage-related area and the hydraulic pressure-related area, the high voltage equipment group is disposed at a position offset from the fuel-related area and the hydraulic-related area; The work machine of claim 2 , wherein the hydraulic equipment group is positioned offset from the fuel-related area and the high voltage-related area.

4. the fuel tank is a hydrogen tank that stores hydrogen, The work machine according to claim 1 , wherein the hydrogen tank is disposed at a position higher than the high-voltage equipment group and the hydraulic equipment group.

5. Further comprising an outer wall; the fuel tank is a hydrogen tank that stores hydrogen, the outer wall is disposed so as to cover an upper portion of the fuel equipment group, The work machine of claim 1 , wherein the exterior wall has an opening formed therein.

6. 2. The work machine according to claim 1, further comprising another equipment group disposed between the fuel equipment group and the high voltage equipment group.

7. The work machine according to claim 1 , further comprising another equipment group disposed between the fuel equipment group and the hydraulic equipment group.

8. The work machine of claim 1 , further comprising a bulkhead disposed between the fuel group and the high voltage group.

9. The work machine of claim 1 , further comprising a bulkhead disposed between the fuel group and the hydraulic group.

10. Further comprising a cooling fan for forming a flow of cooling air, the fuel tank is a hydrogen tank that stores hydrogen, The work machine according to claim 1 , wherein the hydrogen tank is disposed downstream of the group of high-voltage devices in a flow direction of the cooling air.

11. The work machine according to claim 10 , wherein the hydrogen tank is disposed downstream of the hydraulic equipment group in the flow direction of the cooling air.

12. The work machine according to any one of claims 1 to 11, wherein the fuel equipment group is disposed at a height equal to or higher than a height at which the high-voltage equipment group is disposed.

13. The work machine according to claim 12 , wherein the fuel equipment group is disposed at a height equal to or higher than a height at which the hydraulic equipment group is disposed.

14. a fuel device group including a fuel tank and a fuel cell device; High voltage equipment, A hydraulic equipment group; A work machine, wherein the fuel equipment group is disposed at a height equal to or higher than a height at which the high-voltage equipment group is disposed.

15. The work machine according to claim 14 , wherein the fuel equipment group is disposed at a height equal to or higher than a height at which the hydraulic equipment group is disposed.

16. the fuel tank is a hydrogen tank that stores hydrogen, 16. The work machine according to claim 14 or 15, wherein the hydrogen tank is disposed at a position higher than the high-voltage equipment group and the hydraulic equipment group.

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