Work machine

Abstract

To provide a work machine capable of preventing hydrogen from accumulating in the event of a hydrogen leak.SOLUTION: A work machine includes a support structure that supports at least one of a hydrogen tank 31 and an energy generation device 32. The support structure includes an intervening portion 63, 206, 208, 306, 802 located between the hydrogen tank 31 and the energy generation device 32. The intervening portion has a guide portion 63C, 210A, 210B, 308, 804 that guides the hydrogen from a position below the intervening portion to a position above the intervening portion.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a work machine, such as a hydraulic excavator, that is equipped with a hydrogen tank for storing hydrogen. [Background technology]

[0002] Patent Document 1 discloses a work machine having an energy recovery system including an energy storage system. The energy storage system includes at least a part of a hydraulic accumulator, a battery, a flywheel, an ultracapacitor, a fuel cell, and an auxiliary power unit. It also discloses that at least a part of the energy storage system is installed as a counterweight. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-9589 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in a work machine equipped with an energy generation device that generates energy using hydrogen as an energy source, hydrogen may leak from the energy generation device, piping (hydrogen piping) connected to the energy generation device, or the connection between the energy generation device and the hydrogen piping. In such a case, it is preferable to suppress the accumulation of hydrogen. In contrast, Patent Document 1 only discloses mounting an energy storage system on the counterweight, and does not consider the accumulation of hydrogen at all. Note that, for example, a fuel cell device or a hydrogen engine corresponds to the energy generation device.

[0005] An object of the present disclosure is to provide a work machine that can suppress accumulation of hydrogen in the event of a hydrogen leak. [Means for solving the problem]

[0006] The working machine of the first aspect comprises a hydrogen tank for storing hydrogen, an energy generation device arranged below the hydrogen tank and generating energy using the hydrogen as an energy source, hydrogen piping connecting the hydrogen tank and the energy generation device, and a support structure supporting at least one of the hydrogen tank and the energy generation device, wherein the support structure includes an intervening portion located between the hydrogen tank and the energy generation device, and the intervening portion has a guide portion that guides the hydrogen from a position below the intervening portion to a position above the intervening portion.

[0007] In this work machine, if hydrogen leaks from at least one of the energy generating device, the hydrogen piping, and the connections therebetween, the hydrogen moves above the intermediate portion via the guide portion provided in the intermediate portion, thereby allowing the hydrogen to escape above the energy generating device and preventing hydrogen from accumulating.

[0008] In the second aspect, in the work machine according to the first aspect, it is preferable that the intervening portion includes a frame body, and the guide portion includes an opening surrounded by the frame body. In this second aspect, in the event of hydrogen leakage, the hydrogen passes through the opening surrounded by the frame body and moves above the intervening portion. This makes it possible to suppress accumulation of hydrogen.

[0009] A third aspect is preferably the work machine according to the first aspect, further comprising the following feature. That is, in the work machine according to the third aspect, it is preferable that the interposed portion includes a plate-shaped member and a guide member, and that the guide member is disposed below the plate-shaped member and has a guide surface as the guide portion for guiding the hydrogen from a position below the plate-shaped member to a position above the plate-shaped member. In this third aspect, in the event of a hydrogen leak, the hydrogen is guided by the guide surface and moves above the plate-shaped member. This makes it possible to suppress accumulation of hydrogen.

[0010] A fourth aspect is preferably the work machine according to the first aspect, further comprising the following feature. That is, in the work machine according to the fourth aspect, it is preferable that the interposed portion includes a plate-shaped member, and the guide portion includes at least one vent hole formed in the plate-shaped member. In this fourth aspect, in the event of hydrogen leakage, the hydrogen passes through the vent hole formed in the plate-shaped member and moves above the plate-shaped member. This makes it possible to suppress accumulation of hydrogen.

[0011] A fifth aspect is preferably a work machine according to any one of the first to fourth aspects, further comprising the following feature. That is, the work machine according to the fifth aspect is preferably further provided with a cover that covers the hydrogen tank, and an opening is formed in the upper part of the cover. In this fifth aspect, deterioration of the hydrogen tank and the like due to direct sunlight can be suppressed, and water damage to the energy generation device and the like can be prevented. Furthermore, in the event of a hydrogen leak, the hydrogen is discharged through the opening formed in the cover, thereby suppressing hydrogen from accumulating within the cover.

[0012] A sixth aspect is preferably the work machine according to the fifth aspect, further comprising the following feature. That is, in the work machine according to the sixth aspect, it is preferable that the cover has an inclined surface for guiding the hydrogen to the opening. In this sixth aspect, in the event of hydrogen leakage, the hydrogen is guided to the opening via the inclined surface. This ensures that hydrogen is discharged from the opening to the outside of the cover.

[0013] In a seventh aspect, in the working machine according to the first to fourth aspects, it is preferable that the working machine according to the seventh aspect further comprises the following feature. That is, the working machine according to the seventh aspect preferably further comprises a cover that covers the hydrogen tank, and a hydrogen detector that is placed in a space surrounded by the cover. In this seventh aspect, in the event of a hydrogen leak, the hydrogen is detected by the hydrogen detector.

[0014] In the eighth aspect, in the working machine according to the seventh aspect, it is preferable that the working machine further comprises the following feature. That is, in the working machine according to the eighth aspect, it is preferable that an opening is formed in the upper part of the cover, and the hydrogen detector is disposed in the vicinity of the opening. In this eighth aspect, in the event of hydrogen leakage, the hydrogen is discharged to the outside through the opening formed in the upper part of the cover. Furthermore, hydrogen leakage is detected by the hydrogen detector disposed in the vicinity of the opening. Effect of the Invention

[0015] According to the present disclosure, a work machine is provided that can suppress accumulation of hydrogen in the event of a hydrogen leak. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a left side view showing a work machine according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a perspective view of an upper rotating body of the work machine as viewed diagonally from the rear left. [Diagram 3] FIG. 2 is a diagram showing the inside of a machine room of a work machine according to a first embodiment of the present disclosure, and is a cross-sectional view taken along line AA in FIG. [Figure 4] FIG. 2 is a perspective view of a support structure that supports a hydrogen tank. [Diagram 5] FIG. 2 is a diagram showing the inside of a machine room of a work machine according to a second embodiment of the present disclosure, and is a cross-sectional view taken along line AA in FIG. [Figure 6] FIG. 11 is a perspective view of a support structure of a work machine according to a third embodiment of the present disclosure. [Figure 7] 1. FIG. 4 is a diagram showing the inside of a machine room of a work machine according to a fourth embodiment of the present disclosure, and is a cross-sectional view taken along line AA in FIG. [Figure 8] 1. FIG. 4 is a diagram showing the inside of a machine room of a work machine according to a fifth embodiment of the present disclosure, and is a cross-sectional view taken along line AA in FIG. [Figure 9] 1. FIG. 13 is a diagram showing the inside of a machine room of a work machine according to a sixth embodiment of the present disclosure, and is a cross-sectional view taken along line AA in FIG. [Figure 10] 1. FIG. 2 is a diagram showing the inside of a machine room of a work machine according to a seventh embodiment of the present disclosure, and is a cross-sectional view taken along line AA in FIG. [Figure 11] FIG. 11 is a perspective view of a support structure of a work machine according to a modification of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] An embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a left side view showing a work machine 100 according to an embodiment of the present disclosure. Fig. 2 is a perspective view of an upper rotating body 2 of the work machine 100 as seen diagonally from the rear left.

[0018] The work machine 100 includes a lower travelling body 1 including a travelling device, an upper rotating body 2 supported on 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 on 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, for example, a crawler-type travelling device or a travelling device having tires.

[0019] The upper rotating body 2 includes a rotating frame 20, a cab 11 supported by the rotating frame 20, and a counterweight 12.

[0020] The revolving frame 20 is a member supported by the undercarriage 1 so as to be revolvable. The revolving frame 20 includes a frame body 21 and a riser 22. The frame body 21 has an upper surface large enough to accommodate the cab 11, cover 13, etc. The cab 11 is disposed at the left front of the frame body 21, and the counterweight 12 is disposed at the rear of the frame body 21 or rearward of the frame body 21. A driver's seat, operating levers, operating pedals, etc. are disposed in the cab 11. A machine room 14 is formed behind the cab 11.

[0021] In this embodiment, the machinery room 14 is formed behind the cab 11 and in front of the counterweight 12, and is defined by the cover 13. The cover 13 may have any shape that can define the machinery room 14, and the specific shape is not particularly limited. The cover 13 may have, for example, a box shape. Note that if the weight of the equipment placed in the machinery room 14 is large, the counterweight 12 can be omitted.

[0022] The rising body 22 supports the boom 4 so that it can be raised and lowered. As shown in FIG. 1, the rising body 22 has a shape that rises from the frame main body 21 and extends forward and backward as shown by the dashed line in FIG. 1. The rising body 22 includes a boom mounting part 22A (front part) to which the base end part 4A of the boom 4 shown by the dashed line in FIG. 1 is attached, and a rear part 22B. The rear part 22B is located rearward of the boom mounting part 22A and is lower in height than the boom mounting part 22A. In this embodiment, the rising body 22 includes a pair of left and right rising plates that face each other with a gap between them on the left and right. Each of the pair of left and right rising plates is a plate-shaped member that rises from the frame main body 21 and extends forward and backward from the front end to the rear end.

[0023] The cover 13 defines a machine room 14. The cover 13 is a housing including a front wall 13F located at the front side of the machine room 14, a rear wall 13B located at the rear side of the machine room 14, a left wall 13L located at the left side of the machine room 14, a right wall 13R located at the right side of the machine room 14, and an upper wall 13U located at the upper side of the machine room 14. The cover 13 prevents a hydrogen tank 31 (described later) housed in the machine room 14 from being exposed to direct sunlight. The cover 13 also prevents liquids such as muddy water from adhering to electronic devices 34 and hydraulic devices housed in the machine room 14.

[0024] The upper rotating body 2 further includes a weight cover 12W that covers the counterweight 12, and an equipment cover 15H that defines an equipment storage room 15 that provides an equipment storage space for storing various equipment inside. In this embodiment, the weight cover 12W is located behind the rear wall 13B, and the equipment cover 15H is disposed at the right front part of the frame body 21 and in front of the front wall 13F. The weight cover 12W may constitute the counterweight itself. The equipment storage space inside the equipment storage room 15 may be a space that constitutes a part of the machine room 14, or may be a space separate from the machine room 14.

[0025] 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.

[0026] The hydraulic equipment includes a hydraulic pump 81 (see FIG. 3), an unillustrated control valve, and an unillustrated hydraulic oil tank. A part or all of the hydraulic equipment may be disposed inside the machine room 14, or may be disposed outside the machine room 14. A part or all of the hydraulic equipment may be disposed in an equipment accommodating space inside the equipment accommodating chamber 15, or may be disposed outside the equipment accommodating chamber 15. In this embodiment, the hydraulic pump 81 is disposed in the machine room 14, and the control valve is disposed in the equipment accommodating space inside the equipment accommodating chamber 15. The hydraulic pump 81 is driven by an electric motor 34A described later to discharge hydraulic oil.

[0027] The work machine 100 includes a plurality of actuators. Each of the plurality of actuators operates by receiving a supply of hydraulic oil discharged from a hydraulic pump 81. 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, a swing motor (not shown) for rotating the upper swing body 2 relative to the lower traveling body 1, and a traveling motor (not shown) included in the traveling device of the lower traveling body 1.

[0028] The control valve opens and closes in response to a lever or pedal operation given by an operator to an operating device (not shown) so that hydraulic oil is supplied from a hydraulic pump 81 to an actuator corresponding to that operation.

[0029] [First embodiment] Fig. 3 is a diagram showing the inside of the machine room 14 of the work machine 100 according to the first embodiment, and is a cross-sectional view taken along line AA in Fig. 1. Fig. 3 shows various devices disposed in the machine room 14, and also indicates with arrows the flow of cooling air CA in the machine room 14.

[0030] The work machine 100 according to the first embodiment includes a first hydrogen tank 31A and a second hydrogen tank 31B (hereinafter, referred to as hydrogen tanks 31 when no distinction is made) for storing hydrogen, a fuel cell device 32 to which hydrogen (hydrogen gas) is supplied from the hydrogen tank 31, a heat exchanger 33 for exchanging heat with cooling air CA, electronic equipment 34 for operating the work machine 100, and a cover 13 for defining a machine room 14. In the machine room 14, the hydrogen tank 31 is disposed above the electronic equipment 34 in the vertical direction, and is disposed upstream of the heat exchanger 33 in the flow direction of the cooling air CA. The hydrogen tank 31 is formed in an elongated shape, and is disposed such that the longitudinal direction is parallel to the left-right direction of the work machine 100. The first hydrogen tank 31A and the second hydrogen tank 31B are disposed side-by-side in the vertical direction.

[0031] Hydrogen tank 31 is a resin tank formed in a longitudinal shape. An example of a resin tank is a type 4 resin tank. A type 4 resin tank is a resin container with carbon fiber reinforced plastic wrapped around the outside, and is highly strong. However, hydrogen tank 31 is not limited to a type 4 resin tank, and may be another type of resin tank or a tank made of material other than resin.

[0032] The hydrogen tank 31 is connected to the fuel cell device 32 via hydrogen piping 41, and hydrogen gas from the hydrogen tank 31 is supplied to the fuel cell device 32 via the hydrogen piping 41. In other words, the hydrogen piping 41 is a pipe that connects the hydrogen tank 31 and the fuel cell device 32 and transfers hydrogen between them. Note that a pressure reducing valve (not shown) may be provided on the path of the hydrogen piping 41, and hydrogen reduced in pressure by the pressure reducing valve may be supplied to the fuel cell device 32. The hydrogen tank 31 is also connected to a hydrogen filling socket 45 for filling with hydrogen via a filling pipe 44. In FIG. 3, the hydrogen piping 41 and the filling pipe 44 are shown as being connected, but in reality they are connected to the connection part of the hydrogen tank 31 as separate pipes.

[0033] The fuel cell device 32 is disposed below the hydrogen tank 31, and functions as an energy generation device that generates energy using hydrogen as an energy source. The fuel cell device 32 is configured to be able to supply electric power to the electric motor 34A. The fuel cell device 32 includes a fuel cell that generates electric power by electrochemically reacting hydrogen supplied from the hydrogen tank 31 with oxygen (for example, oxygen contained in the air introduced from the air inlet 16). The fuel cell is configured, for example, by a fuel cell stack including a plurality of cells. The fuel cell device 32 corresponds to the "energy generation device" in the claims.

[0034] The heat exchanger 33 cools the fuel cell of the fuel cell device 32. In this embodiment, the heat exchanger 33 is configured to perform heat exchange between the cooling water circulating between the fuel cell device 32 and the heat exchanger 33 and the cooling air CA. The heat exchanger 33 may be, for example, a radiator or another type of heat exchanger.

[0035] The electronic device 34 includes an electric motor 34A and an inverter 34B. The electronic device 34 may further include at least one of a converter, a battery, a compressor, a water pump, and a heater (not shown). The battery may be charged by power generated by the fuel cell device 32. In this embodiment, the electric motor 34A and the inverter 34B are disposed upstream of the fuel cell device 32 in the flow direction of the cooling air CA. However, at least one of the electric motor 34A and the inverter 34B may be disposed downstream of the fuel cell device 32 in the flow direction of the cooling air CA, specifically, in a region between the fuel cell device 32 and the heat exchanger 33.

[0036] The electric motor 34A is a drive source that drives the hydraulic pump 81. The electric motor 34A is operated by receiving a supply of electric power from the fuel cell device 32. The electric motor 34A is configured as, for example, a three-phase motor. The electric motor 34A may be operated by receiving a supply of electric power output from a battery.

[0037] The inverter 34B is connected to the fuel cell device 32 via a high-voltage wiring 47. The inverter 34B is interposed between the fuel cell device 32 and the electric motor 34A, and converts the direct current supplied from at least one of the fuel cell device 32 and the battery into a three-phase alternating current and supplies it to the electric motor 34A. The inverter 34B adjusts the rotation speed of the electric motor 34A.

[0038] The converter steps down the high voltage output from the fuel cell device 32 or the battery and supplies it to a fan motor 35B of a cooling fan 35 described below. 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 water pump circulates cooling water between the fuel cell device 32 and the heat exchanger 33 through water piping 46. The heater may include at least one of an electric heater constituting a heating device that heats the inside of the cab 11, an electric heater for preheating a battery, and an electric heater for preheating hydraulic oil.

[0039] In this work machine 100, even if hydrogen leaks from the hydrogen tank 31, hydrogen gas has a specific gravity of less than 1 relative to air (i.e., it is lighter than air), so the hydrogen gas will move upward from the hydrogen tank 31 in the machinery room 14 and be prevented from reaching the electronic devices 34 and fuel cell device 32 located below the hydrogen tank 31.

[0040] Furthermore, the hydrogen tank 31, which is disposed upstream of the heat exchanger 33 in the machine room 14, is supplied with cooling air CA before it passes through the heat exchanger 33, i.e., cooling air CA before its temperature rises due to heat exchange in the heat exchanger 33. The temperature around the hydrogen tank 31 may rise due to heat generation accompanying the operation of devices disposed inside the machine room 14, such as the fuel cell device 32, electronic devices 34, and hydraulic pump 81, but in this embodiment, the cooling air CA before it passes through the heat exchanger 33 is also supplied around these devices, so that the rise in temperature around the hydrogen tank 31 is more effectively suppressed. Suppressing the rise in temperature around the hydrogen tank 31 also contributes to suppressing deterioration of the resin tank.

[0041] The cover 13 has an intake port 16 and an exhaust port 17. The intake port 16 is an opening for drawing air outside the machine chamber 14 into the machine chamber 14 as cooling air CA. The exhaust port 17 is an opening for discharging the cooling air CA inside the machine chamber 14 to the outside of the machine chamber 14. In this embodiment, the intake port 16 is formed in the right wall portion 13R of the cover 13, and the exhaust port 17 is formed in the left wall portion 13L of the cover 13. However, the portion of the cover 13 where the intake port 16 is formed is not limited to the right wall portion 13R, and the portion where the exhaust port 17 is formed is not limited to the left wall portion 13L. Specifically, for example, the intake port 16 may be formed in the left wall portion 13L, the front wall portion 13F, the rear wall portion 13B, or the upper wall portion 13U. Also, exhaust port 17 may be formed in right wall portion 13R, front wall portion 13F, rear wall portion 13B, or upper wall portion 13U. Note that intake port 16 and exhaust port 17 are preferably formed at positions that face each other in the horizontal direction.

[0042] The work machine 100 is equipped with a cooling fan 35 that forms a flow of cooling air CA. The cooling fan 35 can effectively form a flow of cooling air CA from the intake port 16 to the exhaust port 17 in the machine room 14. In this embodiment, the cooling air CA flows from right to left in the machine room 14 as shown by the arrow in FIG. 3. The cooling fan 35 includes an impeller 35A including a plurality of blades arranged along the outer periphery of a rotating shaft portion, a fan motor 35B that drives the impeller 35A, and a shroud 35C that is arranged to surround the outer periphery of the impeller 35A. The shroud 35C is arranged with a gap in the radial direction relative to the impeller 35A. The cooling fan 35 is operated by receiving power, for example, from the fuel cell device 32 or the battery.

[0043] In this embodiment, the cooling fan 35 is disposed between the exhaust port 17 and the heat exchanger 33. Specifically, the cooling fan 35 is disposed between the exhaust port 17 and the heat exchanger 33 and at a position adjacent to the exhaust port 17.

[0044] In this embodiment, a part (part of the upper side) of the intake port 16 is formed at a height position so as to be aligned horizontally with the hydrogen tank 31, and another part (part of the lower side) of the intake port 16 is formed at a height position so as to be aligned horizontally with the fuel cell device 32. Also, a part (part of the upper side) of the exhaust port 17 is formed at a height position so as to be aligned horizontally with the hydrogen tank 31, and another part (part of the lower side) of the exhaust port 17 is formed at a height position so as to be aligned horizontally with the fuel cell device 32. Also, in this embodiment, the entire area of ​​the exhaust port 17 is formed at a height position so as to be aligned horizontally with the heat exchanger 33. However, a part of the exhaust port 17 may be formed at a position shifted upward with respect to the heat exchanger 33, or may be formed at a position shifted downward with respect to the heat exchanger 33.

[0045] The fuel cell device 32 is disposed in the machinery room 14 at a position vertically below the hydrogen tank 31 and at a position overlapping with the hydrogen tank 31 when viewed vertically from above. In this case, the fuel cell device 32 can be disposed efficiently by utilizing the space below the hydrogen tank 31 inside the machinery room 14, which has a limited size.

[0046] 3, the fuel cell device 32 is disposed directly below the hydrogen tank 31 in the machine room 14. This makes it possible for hydrogen leaking from at least one of the fuel cell device 32 and the connection between the fuel cell device 32 and the hydrogen piping 41 to rise toward the hydrogen tank 31 more reliably.

[0047] In this embodiment, the work machine 100 is equipped with a support structure 60 that supports the hydrogen tank 31. Figure 4 is a perspective view of the support structure 60 that supports the hydrogen tank 31. As shown in Figure 4, the first hydrogen tank 31A and the second hydrogen tank 31B each consist of two tanks lined up in the front-to-rear direction.

[0048] The support structure 60 includes a first frame body 61 that supports the first hydrogen tank 31A, a second frame body 62 that supports the second hydrogen tank 31B, a third frame body 63 located above the fuel cell device 32, a first support leg 64 that supports the first frame body 61 and the second frame body 62, and a second support leg 65 that supports the third frame body 63. The second frame body 62 is located above the first frame body 61. The third frame body 63 is located above the fuel cell device 32 and below the first frame body 61.

[0049] The first frame 61 is disposed parallel to the longitudinal direction of the first hydrogen tank 31A and supports the first hydrogen tank 31A. The first frame 61 is formed in a rectangular shape. Specifically, the first frame 61 has a pair of long side portions 61A disposed parallel to the longitudinal direction of the first hydrogen tank 31A, and a pair of short side portions 61B disposed perpendicular to the longitudinal direction. The pair of long side portions 61A and the pair of short side portions 61B are connected to each other at their respective ends to form a rectangular frame. In relation to this, when the first frame 61 is viewed from above vertically, an opening 61C surrounded by the first frame 61 is formed. In addition, a pair of cross beams 67 are provided between the pair of long side portions 61A, both ends of which are connected to the pair of long side portions 61A, respectively. The cross beams 67 are formed in a longitudinal shape and support the first hydrogen tank 31A from below. The pair of cross beams 67 are provided at a predetermined distance in the longitudinal direction of long side portion 61A. Ends of fastening members 36 for fixing first hydrogen tank 31A are connected to both ends of cross beam 67. With the ends of fastening members 36 connected to both ends of cross beam 67, first hydrogen tank 31A is fastened by fastening members 36, preventing movement of first hydrogen tank 31A.

[0050] The second frame 62 is disposed parallel to the longitudinal direction of the second hydrogen tank 31B and supports the second hydrogen tank 31B. The second frame 62 is formed in a rectangular shape. Specifically, the second frame 62 has a pair of long side portions 62A disposed parallel to the longitudinal direction of the second hydrogen tank 31B, and a pair of short side portions 62B disposed perpendicular to the longitudinal direction. The pair of long side portions 62A and the pair of short side portions 62B are connected to each other at their respective ends to form a rectangular frame. In relation to this, when the second frame 62 is viewed from above vertically, an opening 62C surrounded by the second frame 62 is formed. In addition, a pair of cross beams 69 are provided between the pair of long side portions 62A, both ends of which are connected to the pair of long side portions 62A, respectively. The cross beams 69 are formed in a longitudinal shape and support the second hydrogen tank 31B from below. The pair of cross beams 69 are provided at a predetermined interval in the longitudinal direction of long side portion 62A. Ends of fastening members 38 for fixing second hydrogen tank 31B are connected to both ends of cross beam 69. With the ends of fastening members 38 connected to both ends of cross beam 69, second hydrogen tank 31B is fastened by fastening members 38, preventing movement of second hydrogen tank 31B.

[0051] The third frame 63 is located between the hydrogen tank 31 and the fuel cell device 32, and is arranged parallel to the longitudinal direction of the hydrogen tank 31, similar to the first frame 61 and the second frame 62. The third frame 63 is formed in a rectangular shape. Specifically, the third frame 63 is composed of a pair of long side portions 63A arranged parallel to the longitudinal direction of the hydrogen tank 31, and a pair of short side portions 63B arranged perpendicular to the longitudinal direction. The ends of the pair of long side portions 63A and the pair of short side portions 63B are connected to each other to form a rectangular frame. In relation to this, when the third frame 63 is viewed from above vertically, an opening 63C surrounded by the third frame 63 is formed. This third frame 63 corresponds to the "intervening portion" in the claims, and the opening 63C corresponds to the "guide portion" and the "opening surrounded by the frame" in the claims.

[0052] A pair of elongated extension members 66 are integrally connected to the upper part of the third frame body 63. The extension members 66 are arranged parallel to the long side portion 63A, and one end in the longitudinal direction extends beyond one end of the long side portion 63A.

[0053] The first frame body 61 and the second frame body 62 are arranged in a position where they overlap each other when viewed vertically from above. Furthermore, the long side portion 61A of the first frame body 61, the long side portion 62A of the second frame body 62, and the extension member 66 are arranged in a position where they overlap each other when viewed vertically from above. In this embodiment, the first frame body 61 and the second frame body 62 are arranged in a position where they overlap each other when viewed vertically from above, but they may be arranged in positions shifted from each other. In addition, the third frame body 63 can also be arranged in a position where it overlaps the first frame body 61 and the second frame body 62, so that the extension member 66 can be omitted.

[0054] The first support leg 64 is composed of four leg members 64A. Each leg member 64A extends upward from each end of the extension member 66, and the upper end is connected to each corner of the second frame body 62. In this manner, the first support leg 64 is interposed between the second frame body 62 and the extension member 66, and supports the second frame body 62. In addition, the corners of the first frame body 61 are connected between the leg members 64A via brackets or the like, so that the first frame body 61 is also supported by the first support leg 64.

[0055] The second support leg 65 is composed of four leg members 65A. Each leg member 65A extends downward from a corresponding corner of the third frame body 63. The lower end of each leg member 65A is fixed to the frame body 21 with a bolt or the like.

[0056] A first cross bar 68, which is a reinforcing member, is interposed between the first frame body 61 and the second frame body 62. In addition, a second cross bar 70, which is a reinforcing member, is interposed between the leg members 65A constituting the second support leg 65.

[0057] The work machine 100 is equipped with a plurality of sensors including a hydrogen gas sensor 54 that functions as a hydrogen detector. The hydrogen gas sensor 54 detects hydrogen (hydrogen gas) in the machine room 14. The hydrogen gas sensor 54 is disposed at an upper portion within the machine room 14, taking into consideration that hydrogen moves upward. A plurality of hydrogen gas sensors 54 may be provided at separate positions within the machine room 14, and each is disposed at a position that allows easy passage of hydrogen. In this embodiment, an air vent 19 is formed in the upper wall portion 13U located at the top of the cover 13, and the hydrogen gas sensor 54 is disposed in the vicinity of the air vent 19.

[0058] By providing the hydrogen gas sensor 54, any hydrogen leakage in the machine room 14 is promptly detected. Hydrogen may leak from the fuel cell device 32, the hydrogen piping 41, the connection between the fuel cell device 32 and the hydrogen piping 41, etc. In this case, it is preferable to quickly release the leaked hydrogen upward.

[0059] In contrast, in the support structure 60, the third frame 63 interposed between the hydrogen tank 31 and the fuel cell device 32 has an opening 63C surrounded by the frame 63. Even if hydrogen leaks from the fuel cell device 32 and its connection, the hydrogen can move quickly above the third frame 63 through the opening 63C. In this way, the opening 63C is formed to guide the leaked hydrogen above the third frame 63. In addition, the first frame 61 and the second frame 62 also have openings 61C and 62C surrounded by the frames 61 and 62, respectively, so that hydrogen that has passed through the opening 63C can move upward through the openings 61C and 62C. This allows hydrogen leaking from the fuel cell device 32 and its connection to move quickly upward without stagnation in the support structure 60. Furthermore, the hydrogen gas that has moved above the support structure 60 passes through the vent hole 19 formed in the upper wall portion 13U of the cover 13 and is discharged to the outside of the machine room 14.

[0060] Moreover, since the hydrogen gas sensor 54 is disposed near the ventilation opening 19, hydrogen passing through the ventilation opening 19 is detected by the hydrogen gas sensor 54. In this manner, by disposing the hydrogen gas sensor 54 on the path through which hydrogen passes, hydrogen leakage can be reliably detected.

[0061] As described above, in the first embodiment, if hydrogen leaks from at least one of the fuel cell device 32, the hydrogen piping 41, or the connection between the fuel cell device 32 and the hydrogen piping 41, the hydrogen moves above the third frame 63 through the opening 63C formed in the third frame 63. This allows the leaked hydrogen to escape above the fuel cell device 32, preventing the hydrogen from accumulating in the space in which the fuel cell device 32 is arranged. Furthermore, by forming the vent 19 in the upper wall portion 13U of the cover 13, the leaked hydrogen is discharged from the machine chamber 14 through the vent 19.

[0062] [Second embodiment] Next, a support structure 200 provided in a work machine 100 according to a second embodiment of the present disclosure will be described. Note that the structure other than the support structure 200 is basically the same as that of the first embodiment, and therefore the description thereof will be omitted. The support structure 200 according to the second embodiment has a structure as shown in FIG. 5. FIG. 5 is a diagram showing a schematic view of the support structure 200, and corresponds to the cross-sectional view of the line AA in FIG. 1, as in FIG. 3. Note that in FIG. 5, the cover that divides the machine room 14, the heat exchanger 33, the electronic device 34, and the cooling fan 35 are omitted. Also, in FIG. 5, the hydrogen tanks 31 are arranged in one upper and lower tier, but the hydrogen tanks 31 may be arranged in two upper and lower tiers as in the support structure 60 described above.

[0063] The support structure 200 includes a frame 202 that supports the hydrogen tank 31, support legs 204 that support the frame 202, a plate-like member 206 that is interposed between the frame 202 and the hydrogen tank 31, and a guide member 208 that is interposed between the frame 202 and the fuel cell device 32. The portion including the plate-like member 206 and the guide member 208 corresponds to the "intervening portion" in the claims.

[0064] The frame 202 is composed of a pair of long sides 202A parallel to the longitudinal direction of the hydrogen tank 31 and a pair of short sides (not shown) arranged perpendicular to the longitudinal direction, which are interconnected to form a rectangular frame.

[0065] The support legs 204 are made up of four leg members 204A extending downward from each corner of the frame 202.

[0066] The plate-like member 206 is made of a plate material having a predetermined thickness. The plate-like member 206 is formed, for example, in a rectangular shape, and is provided so as to cover the outer edge of the frame body 202. Therefore, in this embodiment, the opening surrounded by the frame body 202 is blocked by the plate-like member 206. As a result, the plate-like member 206 can prevent the intrusion of liquid such as muddy water falling from above.

[0067] Guide member 208 is disposed below plate-shaped member 206 and frame body 202. Guide member 208 is composed of a pair of plate materials 208A, 208B having a predetermined thickness. Plate materials 208A, 208B both extend in a direction perpendicular to the longitudinal direction of hydrogen tank 31 (depth direction). For example, plate materials 208A, 208B extend in the depth direction to the vicinity of both ends of the short side portion constituting frame body 202.

[0068] Moreover, the plate material 208A is inclined downward from one side to the other side in the longitudinal direction of the long side portion 202A. The plate material 208B is inclined downward from the other side to one side in the longitudinal direction. Furthermore, an end of the plate material 208A and an end of the plate material 208B are connected to each other. As a result, an inclined surface 210A is formed on the side of the plate material 208A facing the fuel cell device 32, and an inclined surface 210B is formed on the side of the plate material 208B facing the fuel cell device 32. The inclined surfaces 210A and 210B correspond to the "guide surface" in the claims.

[0069] In the support structure 200, the opening formed in the frame 202 is blocked by the plate-like member 206, so that hydrogen cannot move upward through the opening. In response to this, a guide member 208 having inclined surfaces 210A and 210B is provided at a position below the plate-like member 206. Each of the inclined surfaces 210A and 210B corresponds to the "guide portion" in the claims. For example, when hydrogen gas leaks from the connection portion between the fuel cell device 32 and the hydrogen pipe 41, the hydrogen moves as shown by the dashed arrow. Specifically, when the leaked hydrogen moves upward, the hydrogen reaches the inclined surface 210B of the guide member 208. At this time, the hydrogen moves further upward along the inclined surface 210B, and the hydrogen moves above the frame 202 and the plate-like member 206 through the leg members 204A. In this way, the leaked hydrogen moves upward along the inclined surface 210B of the plate material 208B, and the hydrogen is guided from a position below the frame body 202 and the plate-like member 206 to a position above these members. As a result, the hydrogen can be released above the support structure 200, and accumulation of hydrogen is suppressed.

[0070] As described above, in the second embodiment, when hydrogen leaks, the hydrogen is guided by the inclined surfaces 210A and 210B and moves above the plate-shaped member 206. This makes it possible to prevent hydrogen from accumulating.

[0071] [Third embodiment] Next, a support structure 300 provided on a work machine 100 according to a third embodiment of the present disclosure will be described. Note that structures other than the support structure 300 are basically the same as those in the first embodiment, and therefore descriptions thereof will be omitted. The support structure 300 according to the third embodiment has a structure as shown in Fig. 6. Fig. 6 is a perspective view showing the support structure 300 in a simplified manner.

[0072] The support structure 300 comprises a frame 302 that supports a hydrogen tank 31 (shown by a dashed line in Figure 6), support legs 304 that support the frame 302, and a plate-shaped member 306 interposed between the frame 302 and the hydrogen tank 31.

[0073] The frame 302 is composed of a pair of long sides 302A parallel to the longitudinal direction of the hydrogen tank 31 and a pair of short sides 302B arranged perpendicular to the longitudinal direction, which are interconnected to form a rectangular frame.

[0074] The support legs 304 are made up of four leg members 304A extending downward from each corner of the frame 302.

[0075] The plate-like member 306 is made of a plate material having a predetermined thickness. The plate-like member 306 is formed, for example, in a rectangular shape, and is provided so as to cover the outer edge of the frame body 302. Therefore, in this embodiment, the opening surrounded by the frame body 302 is blocked by the plate-like member 306. As a result, the plate-like member 306 can prevent the intrusion of liquid such as muddy water falling from above. This plate-like member 306 corresponds to the "intervening portion" in the claims.

[0076] The plate-like member 306 is formed with three vents 308 penetrating in the plate thickness direction. The vents 308 are formed at approximately equal intervals in the longitudinal direction of the long side portion 302A. The vents 308 are formed as elongated holes extending along the longitudinal direction of the short side portion 302B. In this embodiment, three vents 308 are formed, but the number of vents 308 may be at least one. The shape of the vents 308 may be appropriately changed, for example, to a circular shape or an elliptical shape. In other words, the number and shape of the vents 308 are not limited as long as the vents 308 have a shape that allows hydrogen to pass through and prevents the intrusion of liquids such as muddy water when the hydrogen tank 31 is placed on the plate-like member 306. The vents 308 also correspond to the "guide portion" in the claims.

[0077] By forming the vent hole 308 in the plate-shaped member 306, even if hydrogen leaks from the fuel cell device 32, the hydrogen can move upward through the vent hole 308 in the plate-shaped member 306 and move above the plate-shaped member 306. This allows the hydrogen to escape above the support structure 300, and prevents the hydrogen from accumulating.

[0078] As described above, in the third embodiment, when hydrogen leaks, the hydrogen passes through the vent hole 308 formed in the plate-shaped member 306 and moves above the plate-shaped member 306. This makes it possible to prevent hydrogen from accumulating.

[0079] [Fourth embodiment] Next, a work machine 100 according to a fourth embodiment of the present disclosure will be described. The work machine 100 according to the fourth embodiment is characterized by a cover 402 that defines a machine room 14 that covers the hydrogen tank 31, the fuel cell device 32, etc. Fig. 7 is a diagram showing the inside of the machine room 14 of the work machine 100, and is a cross-sectional view taken along line AA in Fig. 1. Note that as for the support structure housed in the machine room 14, any of the support structures 60, 200, 300 described above is appropriately used, and the heat exchanger 33, electronic device 34, cooling fan 35, etc. are omitted. Also, the intake port 16 and the exhaust port 17, etc. are omitted.

[0080] The cover 402 is composed of a plurality of walls. Specifically, the cover 402 includes a front wall 402F located at the front side of the machine room 14, a rear wall 402B located at the rear side of the machine room 14, a left wall 402L located at the left side of the machine room 14, a right wall 402R located at the right side of the machine room 14, and an upper wall 402U located above the machine room 14. The left wall 402L, the right wall 402R, and the upper wall 402U extend in the depth direction (perpendicular to the paper) so as to close the gap between the front wall 402F and the rear wall 402B.

[0081] The upper wall portion 402U of this embodiment is composed of a first upper wall portion 403 located on the left side of the machine room 14 and a second upper wall portion 404 located on the right side of the machine room 14.

[0082] One end of the first upper wall portion 403 is connected to the upper end of the left wall portion 402L. The first upper wall portion 403 is inclined upward toward the right side of the machine room 14, and a tip portion 403A extends vertically upward.

[0083] One end of the second upper wall portion 404 is connected to the upper end of the right wall portion 402R. The second upper wall portion 404 is inclined upward as it approaches the left side of the machine room 14, and a tip portion 404A extends vertically upward.

[0084] The tip 403A of the first upper wall portion 403 and the tip 404A of the second upper wall portion 404 face each other with a predetermined distance therebetween. As a result, an opening 406 communicating with the outside of the machine chamber 14 is formed in the upper part of the cover 402. With the above-mentioned configuration, an inclined surface 408 for guiding hydrogen to the opening 406 is formed on the machine chamber 14 side of the first upper wall portion 403. Similarly, an inclined surface 409 for guiding hydrogen to the opening 406 is formed on the machine chamber 14 side of the second upper wall portion 404. In this embodiment, the tip 403A extending vertically upward is formed on the end of the first upper wall portion 403, and the tip 404A extending vertically upward is formed on the end of the second upper wall portion 404, but these may be omitted.

[0085] For example, if hydrogen leaks from the connection between the fuel cell device 32 and the hydrogen pipe 41, the hydrogen moves upward as indicated by the dashed arrow. Specifically, when the hydrogen moves upward and reaches the upper wall portion 402U, the hydrogen moves upward along the inclined surface 409 of the second upper wall portion 404, and the hydrogen is further discharged from the machine chamber 14 through the opening 406. In this manner, by forming the inclined surfaces 408, 409 on the first upper wall portion 403 and the second upper wall portion 404, respectively, the hydrogen gas that has moved upward is guided along the inclined surfaces 408, 409 to the opening 406 and reliably discharged from the machine chamber 14.

[0086] Here, when the hydrogen gas sensor 54 is provided in the machine room 14, it is preferable to provide it in the vicinity of the opening 406. Specifically, by providing the hydrogen gas sensor 54 in the vicinity of the opening 406 as indicated by the dashed line, hydrogen passing through the opening 406 is detected by the hydrogen gas sensor 54.

[0087] It is also preferable to provide an opening cover 410 as indicated by a dashed line on the opening 406. The opening cover 410 is composed of a flat plate 412 that covers the opening 406, and a plurality of leg members 414 that support the flat plate 412. By providing the opening cover 410, the opening 406 is covered with the flat plate 412, and the intrusion of liquids such as muddy water into the machine room 14 is suppressed. Note that hydrogen discharged from the opening 406 is discharged to the outside through gaps formed between the leg members 414.

[0088] As described above, in the fourth embodiment, in the event of hydrogen leakage, the hydrogen is discharged from opening 406 formed in cover 402, thereby preventing hydrogen from accumulating within cover 402. Furthermore, since hydrogen is guided to opening 406 via inclined surfaces 408, 409, the hydrogen is reliably discharged from opening 406 to the outside of cover 402 via inclined surfaces 408, 409.

[0089] [Fifth embodiment] Next, a work machine 100 according to a fifth embodiment of the present disclosure will be described. The work machine 100 according to the fifth embodiment is characterized by a cover 502 that defines a machine room 14 that covers the hydrogen tank 31, the fuel cell device 32, etc. Fig. 8 is a diagram showing the inside of the machine room 14 of the work machine 100, and is a cross-sectional view taken along line AA in Fig. 1. Note that as for the support structure housed in the machine room 14, any of the support structures 60, 200, 300 as described above is appropriately used, and the heat exchanger 33, electronic device 34, cooling fan 35, etc. are omitted. Also, the intake port 16 and the exhaust port 17, etc. are omitted.

[0090] The cover 502 is composed of a plurality of walls. Specifically, the cover 502 includes a front wall 502F located at the front side of the machine room 14, a rear wall 502B located at the rear side of the machine room 14, a left wall 502L located at the left side of the machine room 14, a right wall 502R located at the right side of the machine room 14, and an upper wall 502U located above the machine room 14. The left wall 502L, the right wall 502R, and the upper wall 502U extend in the depth direction (direction perpendicular to the paper surface) so as to close the gap between the front wall 502F and the rear wall 502B.

[0091] An opening 504 that communicates between the machine chamber 14 and the outside is formed at or near the upper end of the left wall portion 502L. An opening 506 that communicates between the machine chamber 14 and the outside is formed at or near the upper end of the right wall portion 502R. Both openings 504 and 506 are located at the upper part of the cover 502.

[0092] The upper wall portion 502U is composed of a first upper wall portion 508 located on the left side of the machine chamber 14, and a second upper wall portion 510 located on the right side of the machine chamber 14.

[0093] The first upper wall portion 508 is connected to the upper end of the left wall portion 502L. The first upper wall portion 508 is inclined downward toward the right side of the machine room 14. The second upper wall portion 510 is connected to the upper end of the right wall portion 502R. The second upper wall portion 510 is inclined downward toward the left side of the machine room 14. The tip (lower end) of the first upper wall portion 508 and the tip (lower end) of the second upper wall portion 510 are connected to each other.

[0094] By being configured as described above, an inclined surface 512 for guiding hydrogen to the opening 504 is formed on the machine chamber 14 side of the first upper wall portion 508, and an inclined surface 514 for guiding hydrogen to the opening 506 is formed on the machine chamber 14 side of the second upper wall portion 510.

[0095] For example, if hydrogen leaks from the connection between the fuel cell device 32 and the hydrogen pipe 41, the hydrogen moves as shown by the dashed line. Specifically, when the hydrogen moves upward and reaches the second upper wall portion 510, it moves upward along the inclined surface 514 and is discharged from the machine chamber 14 through the opening 506. In this way, by forming the inclined surfaces 512, 514 on the first upper wall portion 508 and the second upper wall portion 510, respectively, the hydrogen that has moved upward is guided along the inclined surfaces 512, 514 to the opening 406 and is reliably discharged from the machine chamber 14.

[0096] Here, when the hydrogen gas sensor 54 is provided in the machine room 14, it is preferable to provide it in the vicinity of the openings 504 and 506. Specifically, by providing the hydrogen gas sensor 54 in the vicinity of the openings 504, 506 as indicated by the dashed lines, hydrogen passing through the openings 504, 506 is detected by the hydrogen gas sensor 54.

[0097] As described above, in the fifth embodiment, in the event of hydrogen leakage, the hydrogen is discharged from the openings 504, 506 formed in the cover 502, thereby preventing the hydrogen from accumulating within the cover 502. In addition, the hydrogen is guided to the openings 504, 506 via the inclined surfaces 512, 514, and therefore the hydrogen is reliably discharged from the openings 504, 506 to the outside of the cover 502 via the inclined surfaces 512, 514.

[0098] [Sixth embodiment] Next, a work machine 100 according to a sixth embodiment of the present disclosure will be described. The work machine 100 according to the sixth embodiment is characterized by a cover 602 that defines the machine room 14 that covers the hydrogen tank 31 and the fuel cell device 32. Fig. 9 is a diagram showing the inside of the machine room 14 of the work machine 100, and is a cross-sectional view taken along line AA in Fig. 1. Note that as for the support structure housed in the machine room 14, any of the support structures 60, 200, and 300 described above is appropriately used, and the heat exchanger 33, electronic device 34, cooling fan 35, and the like are omitted. The intake port 16 and exhaust port 17, and the like are also omitted.

[0099] The cover 602 is composed of a plurality of walls. Specifically, the cover 602 includes a front wall 602F located at the front side of the machine room 14, a rear wall 602B located at the rear side of the machine room 14, a left wall 602L located at the left side of the machine room 14, a right wall 602R located at the right side of the machine room 14, and an upper wall 602U located above the machine room 14. The left wall 602L, the right wall 602R, and the upper wall 602U extend in the depth direction (direction perpendicular to the paper surface) so as to close the gap between the front wall 602F and the rear wall 602B.

[0100] The upper wall portion 602U of this embodiment is composed of a first upper wall portion 604 located on the left side of the machine room 14, a second upper wall portion 606 located on the right side of the machine room 14, and a third upper wall portion 608 connecting the first upper wall portion 604 and the second upper wall portion 606. The first upper wall portion 604 is inclined upward as it approaches the right side of the machine room 14. The second upper wall portion 606 is inclined upward as it approaches the left side of the machine room 14.

[0101] In the above embodiment, since no opening is formed in the upper wall portion 602U, there is an advantage that liquids such as muddy water are less likely to enter the machine chamber 14 from above. In the event of a hydrogen leak in the machine chamber 14, it is preferable to quickly exhaust the hydrogen from the machine chamber 14. It is also more preferable to quickly detect the hydrogen leak. In this embodiment, the hydrogen gas sensor 54 is provided in the machine chamber 14, which is a space surrounded by the cover 602, near the third upper wall portion 608, which is located at the uppermost part of the cover 602.

[0102] For example, if hydrogen leaks from the connection portion between the fuel cell device 32 and the hydrogen pipe 41, the hydrogen moves upward as indicated by the dashed line. Specifically, when the hydrogen gas moves upward and reaches the second upper wall portion 606, the hydrogen moves upward along the inclined surface 610 formed on the second upper wall portion 606, and reaches the hydrogen gas sensor 54 provided in the vicinity of the third upper wall portion 608. In this way, the leaked hydrogen is guided by the inclined surface 610 of the second upper wall portion 606 to the hydrogen gas sensor 54 provided in the vicinity of the third upper wall portion 608, and the hydrogen leakage is promptly detected by the hydrogen gas sensor 54.

[0103] An opening / closing mechanism 612 can also be provided at the hatched position of the third upper wall portion 608. The opening / closing mechanism 612 can be opened or closed manually or automatically to appropriately connect the machine chamber 14 to the outside. For example, when hydrogen is detected by the hydrogen gas sensor 54, the opening / closing mechanism 612 can be operated manually or automatically to connect the machine chamber 14 to the outside, thereby quickly discharging hydrogen from the machine chamber 14 to the outside.

[0104] As described above, in the sixth embodiment, when hydrogen leaks, the hydrogen is detected by the hydrogen gas sensor 54 disposed above the cover 602.

[0105] [Seventh embodiment] Next, a work machine 100 according to a seventh embodiment of the present disclosure will be described. The work machine 100 according to the seventh embodiment is characterized by a cover 702 that defines a machine room 14 that covers a hydrogen tank 31 and a fuel cell device 32. Fig. 10 is a diagram showing the inside of the machine room 14 of the work machine 100, and is a cross-sectional view taken along line AA in Fig. 1. Note that as for the support structure housed in the machine room 14, any of the support structures 60, 200, and 300 described above is appropriately used, and the heat exchanger 33, electronic device 34, cooling fan 35, and the like are omitted. The intake port 16 and exhaust port 17, and the like are also omitted.

[0106] The cover 702 is composed of a plurality of walls. Specifically, the cover 702 includes a front wall 702F located at the front side of the machine room 14, a rear wall 702B located at the rear side of the machine room 14, a left wall 14L located at the left side of the machine room 14, a right wall 702R located at the right side of the machine room 14, and an upper wall 702U located above the machine room 14.

[0107] The upper wall portion 702U of this embodiment is composed of a first upper wall portion 704 located on the left side of the machine room 14, and a second upper wall portion 706 located on the right side of the machine room 14. The first upper wall portion 704 is inclined downward as it approaches the right side of the machine room 14. The second upper wall portion 706 is inclined downward as it approaches the left side of the machine room 14. The tip of the first upper wall portion 704 and the tip of the second upper wall portion 706 are connected to each other.

[0108] In the above embodiment, since no opening is formed in the upper wall portion 702U, there is an advantage that liquids such as muddy water are less likely to enter the machine chamber 14 from above. In the event of hydrogen leakage in the machine chamber 14, it is preferable to quickly exhaust the hydrogen from the machine chamber 14. It is also more preferable to quickly detect the hydrogen leakage. In this embodiment, hydrogen gas sensors 54 are disposed near the joint between the upper end of the left wall portion 704L and the first upper wall portion 704, and near the joint between the upper end of the right wall portion 702R and the second upper wall portion 706.

[0109] For example, if hydrogen leaks from the connection portion between the fuel cell device 32 and the hydrogen pipe 41, the hydrogen moves upward as indicated by the dashed line. Specifically, when the hydrogen moves upward and reaches the second upper wall portion 706, the hydrogen moves upward along the inclined surface 710 formed on the second upper wall portion 706, and reaches the hydrogen gas sensor 54 disposed in the vicinity of the upper end of the right wall portion 702R. In this way, the hydrogen gas is guided along the inclined surface 710 of the second upper wall portion 706 to the hydrogen gas sensor 54, and the hydrogen gas leakage is reliably detected by the hydrogen gas sensor 54.

[0110] As described above, in the seventh embodiment, when hydrogen leaks, the hydrogen is detected by the hydrogen gas sensor 54 disposed above the cover 702.

[0111] [Variations] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and includes, for example, the following modified examples.

[0112] For example, in the first embodiment and the fourth to seventh embodiments, the covers 13, 402, 502, 602, 702 that partition the machine room 14 are formed in a generally rectangular parallelepiped shape, but this is not necessarily limited to this. For example, the covers may be formed in a cylindrical shape or other appropriate modifications. In other words, the shape of the cover is not particularly limited as long as it is a shape that can cover the hydrogen tank 31 and the fuel cell device 32.

[0113] In the above embodiment, the fuel cell device 32 is used as an example of the energy generation device, but the present invention is not limited to the fuel cell device 32. For example, the present invention is not limited to the fuel cell device 32 as long as the device generates energy using hydrogen as an energy source, such as a hydrogen engine.

[0114] Furthermore, in the above embodiment, the hydrogen tank 31 is supported by the support structures 60, 200, 300, but the fuel cell device 32 may also be supported by a support structure. Alternatively, while the fuel cell device 32 is supported by a support structure, the hydrogen tank 31 may be supported by the cover 13, 402, 502, 602, 702 via a bracket or the like. In short, it is sufficient that at least one of the hydrogen tank 31 and the fuel cell device 32 is supported by a support structure and the fuel cell device 32 is disposed below the hydrogen tank 31.

[0115] In the above embodiment, the first frame body 61 is formed by interconnecting a pair of long sides 61A and a pair of short sides 61B, but an appropriate reinforcing member may be provided within the opening 61C surrounded by the first frame body 61 as long as it does not interfere with the first hydrogen tank 31A. Similar modifications can also be made to the second frame body 62, the third frame body 63, and the frames 202 and 302.

[0116] In the above embodiment, the frames 61, 62, 63, 202, and 302 are each formed of a rectangular frame, but are not necessarily limited to a rectangle. For example, the outer shape of the frame may be a parallelogram or a trapezoid when viewed from above. In addition, the outer shape of the frame may be a polygon having pentagons or more sides when viewed from above, in addition to a rectangle.

[0117] In addition, in the above embodiment, each of the support legs 64, 65, 204, 304 is composed of four leg members 64A, 65A, 204A, 304A, but the number of leg members is not limited to four. For example, the number of leg members may be changed appropriately depending on the weight of the hydrogen tank 31, such as being composed of six leg members.

[0118] In the above embodiment, in the support structure 60 shown in Figs. 3 and 4, the first frame 61 and the second frame 62 are disposed above the third frame 63, the first hydrogen tank 31A is supported by the first frame 61, and the second hydrogen tank 31B is supported by the second frame 62. However, a structure in which the hydrogen tank 31 is supported by the third frame 63 may also be used. Specifically, this corresponds to the support structure 800 shown in the perspective view of Fig. 11. The support structure 800 includes a frame 802 as an intervening part between the hydrogen tank 31 and the fuel cell device 32. The hydrogen tank 31 is supported by the frame 802. The frame 802 has an opening 804 surrounded by the frame 802. By forming the opening 804, even if hydrogen leaks from, for example, a connection between the fuel cell device 32 and a hydrogen pipe (not shown), the hydrogen is guided through the opening 804 to a position above the frame body 802. This prevents hydrogen from accumulating. [Explanation of symbols]

[0119] 19: Ventilation hole (opening) 31: Hydrogen tank 32: Fuel cell device (energy generating device) 41: Hydrogen piping 54: Hydrogen gas sensor (hydrogen detector) 60:Support structure 63: Third frame (frame, intervening part) 63C: Opening (guide section) 100:Work machines 200: Support structure 206: Plate member (intervening part) 208: Guide member (intervening part) 210A: Inclined surface (guide surface, guide part) 210B: Inclined surface (guide surface, guide part) 300: Support structure 306: Plate member (intervening part) 308: Ventilation hole (guide part) 402: Wall (cover) 406 :Aperture 408: Inclined surface 409: Inclined surface 502: Wall (cover) 504 :Aperture 506 :Aperture 512: Inclined surface 514: Inclined surface 602: Wall (cover) 702: Wall (cover) 800: Support structure 802: Frame (intervening part) 804: Opening (guide part)

Claims

1. A hydrogen tank for storing hydrogen; an energy generating device that is disposed below the hydrogen tank and generates energy using the hydrogen as an energy source; A hydrogen pipe connecting the hydrogen tank and the energy generating device; a support structure for supporting at least one of the hydrogen tank and the energy generating device; the support structure includes an intermediate portion located between the hydrogen tank and the energy generation device; The intermediate portion has a guide portion that guides the hydrogen from a position below the intermediate portion to a position above the intermediate portion. A working machine characterized by:

2. The intermediate portion includes a frame body, The guide portion includes an opening surrounded by the frame body.

2. A work machine according to claim 1.

3. The intervening portion includes a plate-like member and a guide member, The guide member is disposed below the plate-like member and has a guide surface as the guide portion for guiding the hydrogen from a position below the plate-like member to a position above the plate-like member.

2. A work machine according to claim 1.

4. The intervening portion includes a plate-shaped member, The guide portion includes at least one ventilation hole formed in the plate-like member.

2. A work machine according to claim 1.

5. Further comprising a cover for covering the hydrogen tank, An opening is formed in the top of the cover. A working machine according to any one of claims 1 to 4.

6. The cover has an inclined surface for guiding the hydrogen to the opening.

6. A work machine according to claim 5.

7. A cover for covering the hydrogen tank; and a hydrogen detector disposed in the space surrounded by the cover. A working machine according to any one of claims 1 to 4.

8. An opening is formed in an upper portion of the cover, The hydrogen detector is disposed near the opening.

8. A work machine according to claim 7.

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