Construction machine

Abstract

A hydraulic shovel (1) is provided with: a vehicle body comprising a lower traveling body (2) capable of self-traveling and an upper rotating body (3); and an operator seat (9) provided on the upper rotating body (3). The upper rotating body (3) is provided with: a fuel cell (11) that generates power to be supplied to the electric motor (14); a hydrogen storage container (20) for storing hydrogen supplied to the fuel cell (11); a heat exchange device (24) that cools the fuel cell (11); and cooling fans (25C), (25D), (26A), (27A) that supply cooling air to the heat exchange device (24). The driver's seat (9) is disposed further upstream than the hydrogen storage container (20) with respect to the flow direction of the cooling air (F1) generated by the cooling fans (25C), (25D), (26A), (27A).

Description

Technical Field

[0001] The present invention relates to construction machinery such as a hydraulic excavator having a fuel cell system. Background Art

[0002] In recent years, some construction machinery such as hydraulic excavators have been equipped with fuel cell systems that take environmental considerations into account. The fuel cell system includes a fuel cell that generates power to supply an electric motor that is a power source for the construction machinery, and a hydrogen storage tank that stores hydrogen supplied to the fuel cell (see Patent Document 1).

[0003] When the hydrogen in the hydrogen storage container is reduced due to the operation of the construction machinery, for example, it is necessary to use a vehicle equipped with a hydrogen supply device (mobile hydrogen supply device) to fill the hydrogen storage container with hydrogen. In this case, the vehicle equipped with the hydrogen supply device is moved to the vicinity of the construction machinery, and new hydrogen is filled in the hydrogen storage container while the filling nozzle of the hydrogen supply device is connected to the hydrogen storage container. In this way, hydrogen can be stably supplied to the fuel cell of the construction machinery operating at the work site.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2022-180565 Summary of the invention

[0007] However, when hydrogen is filled from a hydrogen supply device to a hydrogen storage container mounted on a construction machine, there is a possibility that hydrogen leaks and stays around the hydrogen storage container due to, for example, an abnormality of the hydrogen supply device or an error in the hydrogen filling operation. It is desirable to discharge the hydrogen staying around the hydrogen storage container in a manner that is quickly away from the driver's seat.

[0008] An object of the present invention is to provide a construction machine capable of discharging hydrogen gas existing around a hydrogen storage container so as to quickly move away from a driver's seat.

[0009] The engineering machinery of the present invention has a self-propelled vehicle body, the vehicle body having: a driver's seat; a fuel cell that generates electricity to be supplied to an electric motor; a hydrogen storage container that stores hydrogen to be supplied to the fuel cell; a heat exchanger for cooling the fuel cell; and a cooling fan that supplies cooling air to the heat exchanger, the engineering machinery being characterized in that the driver's seat is arranged on the upstream side compared to the hydrogen storage container with respect to the flow direction of the cooling air generated by the cooling fan.

[0010] According to the present invention, the hydrogen gas existing around the hydrogen storage container can be discharged so as to quickly move away from the driver's seat by utilizing the cooling air flowing from the driver's seat toward the hydrogen storage container. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a left side view showing the hydraulic excavator to which the first embodiment of the present invention is applied.

[0012] Figure 2 This is a top view conceptually showing the arrangement of the driver's seat, fuel cell, hydrogen storage container, heat exchange device, etc. from above.

[0013] Figure 3 This is a left side view conceptually showing the arrangement of the driver's seat, fuel cell, hydrogen storage container, heat exchange device, etc. from the left side.

[0014] Figure 4 This is a rear view conceptually showing the arrangement of the heat exchange device from the rear.

[0015] Figure 5 This is a block diagram showing the connection status of the hydrogen storage container, fuel cell, electric motor, controller, heat exchange device, etc.

[0016] Figure 6 This is a flowchart showing a control process for discharging hydrogen gas existing around a hydrogen storage container.

[0017] Figure 7 This is a plan view conceptually showing the arrangement of a driver's seat, a fuel cell, a hydrogen storage container, a heat exchange device, etc. according to the second embodiment from above.

[0018] Figure 8 This is a left side view conceptually showing the arrangement of the heat exchange device and the like according to the third embodiment from the left side.

[0019] Fig. 9 This is a left side view conceptually showing the arrangement of the heat exchange device and the like according to the fourth embodiment from the left side.

[0020] Fig.10 This is a rear view conceptually showing the arrangement of the heat exchange device according to the fourth embodiment from the rear.

[0021] Fig.11 : is a flowchart showing a modification of the control process for exhausting hydrogen gas. DETAILED DESCRIPTION

[0022] Below, taking the case of hydraulic excavator as an example, refer to Figures 1 to 10 In the embodiment, the construction machine according to the embodiment of the present invention is described in detail. In addition, in the embodiment, the traveling direction of the hydraulic excavator is referred to as the front-rear direction, and the direction perpendicular to the traveling direction of the hydraulic excavator is referred to as the left-right direction.

[0023] Figures 1 to 6The first embodiment of the present invention is shown. A hydraulic excavator 1 representing an engineering machine has a crawler-type lower traveling body 2 capable of self-propelled movement, and an upper rotating body 3 rotatably mounted on the lower traveling body 2. The body of the hydraulic excavator 1 is composed of the lower traveling body 2 and the upper rotating body 3. The hydraulic excavator 1 has: an electric motor 14 serving as a power source; a fuel cell 11 generating electric power to be supplied to the electric motor 14; and a hydrogen storage container 20 storing hydrogen supplied to the fuel cell 11.

[0024] The upper rotating body 3 is rotatably mounted on the lower traveling body 2 via a rotating device 4. The upper rotating body 3 has a rotating frame 5 serving as a base. The rotating frame 5 is composed of a central frame 5A located in the center in the left-right direction, and a left frame 5B and a right frame 5C arranged on both sides of the central frame 5A. A working device 6 for excavation and the like is mounted on the front end side of the rotating frame 5. A counterweight 7 is provided on the rear end side of the rotating frame 5 to achieve weight balance with the working device 6. An exhaust port 7A is formed on the rear surface of the counterweight 7.

[0025] A cabin 8 forming a cab is provided on the left side of the front part of the rotating frame 5, and a driver's seat 9 for the operator to sit on, and a travel lever device, an operating lever device, etc. operated by the operator are provided in the cabin 8 (none of which is shown in the figure). An outer cover 10 is provided on the rotating frame 5 in a manner that is located in front of the counterweight 7. A fuel cell 11, an electric motor 14, a hydraulic pump 16, a hydrogen storage container 20, a heat exchange device 24, etc. described later are accommodated inside the outer cover 10. The outer cover 10 has a left side 10A, a right side 10B, and an upper surface 10C. A vent 10D that connects the inside of the outer cover 10 with the outside is formed on the left side 10A and the right side 10B. An upper cover 10E is provided on the upper surface 10C, and the upper cover 10E covers the hydrogen storage container 20, the heat exchange device 24, etc. protruding upward from the upper surface 10C.

[0026] The fuel cell 11 is located at the rear side of the cabin 8 and mounted on the revolving frame 5. The fuel cell 11, for example, together with auxiliary machines such as a PCU (Power Control Unit) and a supercharger (none of which are shown in the figure), constitutes a fuel cell system. The fuel cell 11 uses hydrogen supplied from a hydrogen storage container 20 to generate electric power supplied to the electric motor 14. The battery (secondary battery) 12 is adjacent to the left side of the fuel cell 11 and is mounted on the revolving frame 5. The battery 12 stores, for example, excess power generated by the fuel cell 11 that exceeds the power supplied to the electric motor 14. Figure 5 As shown, the fuel cell 11 and the battery 12 are connected via a high-voltage cable 13 .

[0027] The electric motor 14 is mounted on the center portion of the left-right direction of the rotating frame 5 adjacent to the right side of the fuel cell 11. The electric motor 14 is connected to an inverter 15 via a high-voltage cable 13. The inverter 15 is connected to the fuel cell 11 via the high-voltage cable 13. The inverter 15 converts the DC power supplied from the fuel cell 11 or the battery 12 into AC power and supplies it to the electric motor 14, thereby controlling the rotation of the electric motor 14.

[0028] The hydraulic pump 16 is mounted on the revolving frame 5 adjacent to the right side of the electric motor 14. The hydraulic pump 16 is driven by the electric motor 14 to pressurize and discharge the hydraulic oil stored in the hydraulic oil tank (not shown). The control valve 17 is mounted on the right front side of the revolving frame 5. The control valve 17 is connected to various hydraulic actuators mounted on the hydraulic excavator 1 and the hydraulic pump 16 via hydraulic pipes (not shown), and selectively supplies the hydraulic oil (hydraulic oil) discharged from the hydraulic pump 16 to the various hydraulic actuators.

[0029] The DC / DC converter 18 is connected to the fuel cell 11 via the high-voltage cable 13, and is connected to cooling fans 25C, 25D, 26A, and 27A described later via the cable 19. The DC / DC converter 18 converts the DC power supplied from the fuel cell 11 or the battery 12 into a voltage corresponding to the cooling fans 25C, 25D, 26A, and 27A according to a control signal from a controller 36 described later, and outputs the converted DC power.

[0030] A plurality of hydrogen storage containers (hydrogen tanks) 20 are located between the fuel cell 11 and the electric motor 14 and the counterweight 7 and are arranged on the rear side of the rotating frame 5. Figure 2 as well as Figure 3 As shown, the hydrogen storage container 20 is composed of a cylindrical container with excellent pressure resistance, and is arranged in a state extending in the left-right direction of the rotating frame 5. Compressed high-pressure hydrogen is stored inside the hydrogen storage container 20. A shelf 21 is fixed to the rear side of the rotating frame 5, and a plurality of hydrogen storage containers 20 are held by the shelf 21 in a state of being arranged in the up-down direction. The hydrogen storage container 20 is connected to the fuel cell 11 via a hydrogen pipeline 22, and a hydrogen valve 23 is provided in the middle of the hydrogen pipeline 22. The hydrogen valve 23 opens and closes the hydrogen pipeline 22 according to a control signal from the controller 36, and controls the supply of hydrogen from the hydrogen storage container 20 to the fuel cell 11.

[0031] When hydrogen is filled into the hydrogen storage container 20 mounted on the hydraulic excavator 1 operating at a work site, for example, a vehicle (not shown) mounted with hydrogen supply equipment is moved to the vicinity of the hydraulic excavator 1, and the filling nozzle of the hydrogen supply equipment is connected to the hydrogen storage container 20. Thus, the hydrogen storage container 20 is filled with compressed hydrogen, and hydrogen can be stably supplied to the fuel cell 11 mounted on the hydraulic excavator 1.

[0032] The heat exchange device 24 is located between the counterweight 7 and the hydrogen storage container 20 and is mounted on the rear side of the revolving frame 5. The heat exchange device 24 is composed of a fuel cell radiator 25, a motor and inverter radiator 26, and an oil cooler 27. The fuel cell radiator 25, the motor and inverter radiator 26, and the oil cooler 27 are arranged in a row along the left and right direction of the revolving frame 5, and pass through the exhaust port 7A of the counterweight 7 to face the outside of the upper revolving body 3. In this way, by mounting the heat exchange device 24 on the rear side of the revolving frame 5, it is possible to arrange the battery 12 or the oil filter (not shown) and other equipment that requires regular maintenance near the left side 10A and the right side 10B of the exterior cover 10, thereby achieving a structure that can improve the maintainability of these equipment.

[0033] The fuel cell radiator 25 is disposed on the rear side of the fuel cell 11. The fuel cell radiator 25 is connected to a cooling water circulation path (not shown) provided in the fuel cell 11 and auxiliary equipment (PCU, supercharger, etc.) of the fuel cell 11 via a cooling water passage 28. Figure 4 As shown, the radiator 25 for fuel cells is formed by connecting two cooling units 25A and 25B. Two cooling fans 25C and 25D are installed on the rear side of the radiator 25 for fuel cells. The rotation of the cooling fans 25C and 25D allows the external air to flow into the interior of the external cover 10 through the vents 10D formed on the left side 10A and the right side 10B of the external cover 10. After the external air converges in the external cover 10, it becomes the cooling wind F1 of the solid arrow from the front side (driver's seat 9 side) of the rotating frame 5 to the rear side (hydrogen storage container 20 side). The cooling wind F1 passes through the exhaust port 7A of the counterweight 7 and is discharged to the outside of the upper rotating body 3 (external cover 10). At this time, the heat is released from the radiator 25 for fuel cells into the cooling wind F1, thereby cooling the fuel cell 11 and the auxiliary machine. The cooling fans 25C and 25D are composed of electric fans, and the rotation direction and speed are controlled according to the control signal from the controller 36.

[0034] The motor and inverter radiator 26 is arranged at the rear side of the electric motor 14. The motor and inverter radiator 26 is connected to a cooling water circulation path (not shown) provided in the electric motor 14 and the inverter 15 via a cooling water passage 29. A cooling fan 26A composed of an electric fan is installed at the rear side of the motor and inverter radiator 26. Heat is released from the motor and inverter radiator 26 to the cooling air F1 generated by the rotation of the cooling fan 26A, thereby cooling the electric motor 14 and the inverter 15.

[0035] The oil cooler 27 is arranged at the rear side of the hydraulic pump 16. The oil cooler 27 is connected to the hydraulic circuit connected to the hydraulic pump 16 and the control valve 17 via the hydraulic passage 30. A cooling fan 27A composed of an electric fan is installed at the rear side of the oil cooler 27. The heat of the working oil (return oil) returning from the hydraulic actuator to the working oil tank (not shown) is released into the cooling air F1 generated by the rotation of the cooling fan 27A, thereby cooling the working oil.

[0036] The shielding member 31 is provided between the hydrogen storage container 20 and the heat exchange device 24. The shielding member 31 is formed of a cylindrical body having a width dimension equal to that of the hydrogen storage container 20 in the left-right direction of the rotating frame 5. The shielding member 31 forms a passage for the cooling air F1 between the hydrogen storage container 20 and the heat exchange device 24, and guides the cooling air F1 generated by the rotation of the cooling fans 25C, 25D, 26A, and 27A to the heat exchange device 24 (the radiator 25 for the fuel cell, the radiator 26 for the motor and the inverter, and the oil cooler 27). Here, the cooling fans 25C, 25D, 26A, and 27A and the shielding member 31 are arranged on the downstream side of the hydrogen storage container 20 relative to the flow direction of the cooling air F1. As a result, the following structure is obtained: the cooling air F1 is suppressed from colliding with the hydrogen storage container 20 and becoming turbulent, and the flow of the cooling air F1 is rectified by the shielding member 31, so that a large amount of cooling air F1 can be efficiently supplied to the heat exchange device 24.

[0037] The hydrogen sensor 32 is located in the exterior cover 10 mounted on the revolving frame 5 and is provided near the hydrogen storage container 20. The hydrogen sensor 32 detects the concentration of hydrogen gas remaining around the hydrogen storage container 20 when hydrogen gas leaks during the filling operation of the hydrogen storage container 20, for example, and outputs a detection signal corresponding to the concentration of hydrogen gas to the controller 36.

[0038] The temperature sensor 33 is provided in the cooling water passage 28 connected to the fuel cell radiator 25. The temperature sensor 33 detects the temperature of the cooling water flowing into or flowing out of the fuel cell radiator 25, and outputs a detection signal corresponding to the temperature to the controller 36. The temperature sensor 34 is provided in the cooling water passage 29 connected to the motor and inverter radiator 26. The temperature sensor 34 detects the temperature of the cooling water flowing into or flowing out of the motor and inverter radiator 26, and outputs a detection signal corresponding to the temperature to the controller 36. The temperature sensor 35 is provided in the hydraulic passage 30 connected to the oil cooler 27. The temperature sensor 35 detects the temperature of the working oil flowing into or flowing out of the oil cooler 27, and outputs a detection signal corresponding to the temperature of the working oil to the controller 36.

[0039] The controller 36 controls the operation of the fuel cell 11, the battery 12, the inverter 15, the DC / DC converter 18, the hydrogen valve 23, and the cooling fans 25C, 25D, 26A, and 27A. The hydrogen sensor 32, the temperature sensors 33, 34, and 35, and the start key 37 are connected to the input side of the controller 36. The fuel cell 11, the battery 12, the inverter 15, the DC / DC converter 18, the hydrogen valve 23, and the cooling fans 25C, 25D, 26A, and 27A are connected to the output side of the controller 36.

[0040] The start key 37 is disposed in the cabin 8, and is operated by the operator to start the controller 36. The controller 36 starts the battery 12, the inverter 15, the DC / DC converter 18, the hydrogen valve 23, and the fuel cell 11. In addition, the controller 36 supplies control signals to the cooling fans 25C, 25D, 26A, and 27A based on the detection signals input from the hydrogen sensor 32 and the temperature sensors 33, 34, and 35, and controls the operations thereof.

[0041] The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Therefore, when the hydraulic excavator 1 is operated, the operator operates the start key 37 in the cabin 8 to start the controller 36. The controller 36 turns on the power of the inverter 15, the battery 12, the DC / DC converter 18, and the hydrogen valve 23. When the inverter 15, the battery 12, the DC / DC converter 18, and the hydrogen valve 23 are started, the controller 36 starts the fuel cell 11. When the start of the fuel cell 11 is completed, the completion of the start of the fuel cell 11 is displayed on a monitor (not shown) disposed in the cabin 8.

[0042] The operator confirms the completion of the start-up of the fuel cell 11 through the display of the monitor, and operates the buttons (not shown) arranged in the cabin 8. Thus, the power generation of the fuel cell 11, the discharge or charging of the battery 12, and the driving of the electric motor 14 are started. If the hydraulic pump 16 is driven by the electric motor 14, the working oil (hydraulic oil) discharged from the hydraulic pump 16 is supplied to the control valve 17. The control valve 17 selectively supplies working oil to various hydraulic actuators according to the operation of the travel lever device and the operating lever device (neither of which are shown in the figure) provided in the cabin 8. As a result, the hydraulic excavator 1 self-drives at the work site, and while rotating the upper rotating body 3, the working device 6 is used to perform earth and sand excavation operations, etc.

[0043] After the fuel cell 11 starts to generate electricity, the controller 36 controls the rotation of the cooling fans 25C, 25D, 26A, and 27A based on the detection signals from the temperature sensors 33, 34, and 35. That is, the controller 36 determines the rotation speed of the cooling fans 25C and 25D based on the temperature of the cooling water indicated by the detection signal output from the temperature sensor 33, and determines the rotation speed of the cooling fan 26A based on the temperature of the cooling water indicated by the detection signal output from the temperature sensor 34, and supplies control signals to these cooling fans 25C, 25D, and 26A. Similarly, the controller 36 determines the rotation speed of the cooling fan 27A based on the temperature of the working oil indicated by the detection signal output from the temperature sensor 35, and supplies control signals to the cooling fan 27A.

[0044] Thus, the cooling fans 25C, 25D, 26A, and 27A rotate independently, and the outside air flows into the inside of the exterior cover 10 through the vents 10D formed on the left side 10A and the right side 10B of the exterior cover 10. After the outside air converges in the exterior cover 10, it becomes the cooling air F1 indicated by the solid arrow from the front side (driver's seat 9 side) of the revolving frame 5 to the rear side (hydrogen storage container 20 side). The cooling air F1 passes through the fuel cell radiator 25, the motor and inverter radiator 26, and the oil cooler 27 to cool these devices, and then is discharged to the outside of the upper revolving body 3 from the exhaust port 7A of the counterweight 7.

[0045] In this way, when the hydraulic excavator 1 is operated, the cooling fans 25C and 25D that supply cooling air to the fuel cell radiator 25, the cooling fan 26A that supplies cooling air to the motor and inverter radiator 26, and the cooling fan 27A that supplies cooling air to the oil cooler 27 are controlled independently. As a result, the hydraulic oil discharged from the fuel cell 11, the electric motor 14, the inverter 15, and the hydraulic pump 16 can be appropriately cooled according to their respective temperatures. In addition, the flow direction of the cooling air F1 can be changed from the rear side to the front side of the revolving frame 5 by rotating the cooling fans 25C, 25D, 26A, and 27A in the opposite direction. In this case, the cooling air F2 indicated by the dotted arrow flows into the interior of the exterior cover 10 through the exhaust port 7A of the counterweight 7, and after passing through the radiator 25 for the fuel cell, the radiator 26 for the motor and inverter, and the oil cooler 27, it passes through the vents 10D formed on the left side 10A and the right side 10B of the exterior cover 10 and is discharged to the outside of the upper rotating body 3.

[0046] When the amount of hydrogen stored in the hydrogen storage container 20 decreases due to the operation of the hydraulic excavator 1, for example, a vehicle (mobile hydrogen supply equipment) equipped with a hydrogen supply device is moved to the vicinity of the hydraulic excavator 1 to fill the hydrogen storage container 20 with hydrogen. In this case, the hydrogen compressed in the hydrogen storage container 20 is filled with hydrogen while the filling nozzle of the hydrogen supply device is connected to the hydrogen storage container 20 accommodated in the exterior cover 10. During the hydrogen filling operation, for example, when an abnormality occurs in the hydrogen supply device and the compressed hydrogen leaks, the hydrogen fills the exterior cover 10, and there is a possibility that the hydrogen stays around the hydrogen storage container 20 until the next operation of the hydraulic excavator 1.

[0047] In contrast, in the present embodiment, when the hydraulic excavator 1 is in operation, when the presence of hydrogen gas is detected around the hydrogen storage container 20, the cooling air F1 generated by the cooling fans 25C, 25D, 26A, and 27A is used to discharge the hydrogen gas to the outside of the upper rotating body 3. Figure 6 A control process executed by the controller 36 regarding the detection and discharge of hydrogen gas during the operation of the hydraulic excavator 1 will be described.

[0048] This control process is started, for example, by operating the start key 37 to start the controller 36. In step S1, the controller 36 reads the hydrogen concentration value around the hydrogen storage container 20 (inside the outer cover 10) based on the detection signal output from the hydrogen sensor 32. In the subsequent step S2, the controller 36 determines whether the hydrogen concentration value is an abnormal value based on a comparison with a preset normal value. During the period when the judgment in step S2 is "no", the judgment of the hydrogen concentration value is repeated. If the judgment in step S2 is "yes", the hydrogen concentration value is determined to be an abnormal value in step S3.

[0049] When the hydrogen concentration value is determined to be an abnormal value in step S3, it is considered that hydrogen exists (retained) around the hydrogen storage container 20. Therefore, in step S4, the controller 36 supplies control signals to the cooling fans 25C, 25D, 26A, and 27A, and sets the rotation direction of the cooling fans 25C, 25D, 26A, and 27A in such a manner that the driver's seat 9 is on the upstream side compared to the hydrogen storage container 20 with respect to the flow direction of the cooling air. Specifically, the rotation direction of the cooling fans 25C, 25D, 26A, and 27A is set in such a manner that the cooling air F1 indicated by the solid arrow is generated. As a result, the outside air flowing into the interior of the exterior cover 10 from the vent 10D becomes the cooling air F1, which is discharged to the outside of the upper rotating body 3 through the exhaust port 7A of the counterweight 7. As a result, the hydrogen existing around the hydrogen storage container 20 can be discharged to the outside of the upper rotating body 3 together with the cooling air F1.

[0050] Here, the driver's seat 9 provided in the cabin 8 is arranged on the upstream side of the hydrogen storage container 20 with respect to the flow direction of the cooling air F1. Thus, the hydrogen gas can be sent in a direction away from the driver's seat 9, and will not be discharged to the outside of the upper rotating body 3 through the driver's seat 9. In addition, the fuel cell radiator 25, the motor and inverter radiator 26, and the oil cooler 27 may be provided by the following methods: Figure 2 The cooling air F2 flows from the exhaust port 7A of the counterweight 7 into the interior of the outer cover 10 as shown by the dotted arrow in FIG. 1 and passes through the vent 10D to be discharged to the outside of the upper rotating body 3. In this case, the controller 36 changes the rotation direction of the cooling fans 25C, 25D, 26A, and 27A in a manner to generate cooling air F1 in the opposite direction to the cooling air F2 in step S4. In this way, when hydrogen exists around the hydrogen storage container 20, the controller 36 appropriately sets the rotation direction of the cooling fans 25C, 25D, 26A, and 27A, thereby preventing the hydrogen from passing through the driver's seat 9 and being discharged to the outside of the upper rotating body 3.

[0051] In the subsequent step S5, the controller 36 supplies control signals to the cooling fans 25C, 25D, 26A, and 27A to increase the rotation speed of these fans. As a result, the cooling fans 25C, 25D, 26A, and 27A are driven at a fixed high speed, for example, regardless of the temperature of the cooling water and the temperature of the working oil. As a result, the hydrogen gas existing around the hydrogen storage container 20 can be discharged to the outside of the upper rotating body 3 (exterior cover 10) in a manner that is quickly away from the driver's seat 9.

[0052] Next, the controller 36 reads the hydrogen concentration value around the hydrogen storage container 20 based on the detection signal from the hydrogen sensor 32 in step S6, and determines whether the hydrogen concentration value is an abnormal value in the subsequent step S7. In the case of "yes" in step S7, since hydrogen exists around the hydrogen storage container 20, the processing after step S4 is repeated. On the other hand, in the case of "no" in step S7, it is considered that the hydrogen concentration value around the hydrogen storage container 20 has returned to a normal value. Therefore, the controller 36 switches the operation of the cooling fans 25C, 25D, 26A, and 27A to normal operation in step S8, and then ends the control processing. As a result, the rotation of the cooling fans 25C, 25D, 26A, and 27A is independently controlled according to the temperature of the cooling water flowing in the cooling water passage 28, the temperature of the cooling water flowing in the cooling water passage 29, and the temperature of the working oil flowing in the hydraulic passage 30.

[0053] Thus, according to the present embodiment, when new hydrogen is filled into the hydrogen storage container 20 from the hydrogen supply device, even if hydrogen leaks and accumulates around the hydrogen storage container 20 due to, for example, an abnormality of the hydrogen supply device, the hydrogen can be sent out in a direction away from the driver's seat 9 by the cooling air F1 generated by the cooling fans 25C, 25D, 26A, and 27A, and the hydrogen is not discharged from the driver's seat 9 through the exhaust port 7A of the counterweight 7 to the outside of the upper rotating body 3 (exterior cover 10). In addition, even if the cooling fans 25C, 25D, 26A, and 27A generate cooling air F2 in the opposite direction to the cooling air F1, when hydrogen exists around the hydrogen storage container 20, the rotation direction of the cooling fans 25C, 25D, 26A, and 27A can be changed by the controller 36. As a result, the cooling air F2 can be changed to the cooling air F1 in the opposite direction, and the hydrogen can be discharged to the outside of the upper rotating body 3 in a manner that is quickly away from the driver's seat 9.

[0054] In this way, the hydraulic excavator 1 based on the embodiment has a vehicle body (a lower traveling body 2 and an upper rotating body 3) that can travel by itself, and the upper rotating body 3 has: a driver's seat 9; a fuel cell 11 that generates electricity to be supplied to an electric motor 14; a hydrogen storage container 20 that stores hydrogen to be supplied to the fuel cell 11; a heat exchange device 24 for cooling the fuel cell 11; and cooling fans 25C, 25D, 26A, and 27A that supply cooling air to the heat exchange device 24, and the driver's seat 9 is arranged on the upstream side compared to the hydrogen storage container 20 with respect to the flow direction of the cooling air F1 generated by the cooling fans 25C, 25D, 26A, and 27A.

[0055] According to this configuration, the cooling air F1 flowing from the driver's seat 9 toward the hydrogen tank 20 can discharge hydrogen gas around the hydrogen tank 20 to the outside of the upper rotating body 3 so as to quickly move away from the driver's seat 9 .

[0056] In the embodiment, a shielding member 31 is provided for guiding the cooling air F1 to the heat exchange device 24, and the cooling fans 25C, 25D, 26A, 27A and the shielding member 31 are arranged on the downstream side of the hydrogen storage container 20 with respect to the flow direction of the cooling air F1. According to this configuration, it is possible to suppress the cooling air F1 from colliding with the hydrogen storage container 20 and becoming turbulent, and the flow of the cooling air F1 is rectified by the shielding member 31. As a result, a large amount of cooling air F1 can be efficiently supplied to the heat exchange device 24, and the cooling of the fuel cell 11 can be promoted.

[0057] In the embodiment, the heat exchange device 24 is arranged on the downstream side of the hydrogen storage container 20 with respect to the flow direction of the cooling air F1. According to this configuration, after the cooling air F1 passes through the heat exchange device 24 and is heated, it does not collide with the hydrogen storage container 20 and is discharged to the outside of the upper rotating body 3. As a result, it is possible to suppress the hydrogen storage container 20 from being exposed to high temperature, and the life of the hydrogen storage container 20 is extended.

[0058] In the embodiment, an exhaust port 7A is provided on the counterweight 7 constituting the upper rotating body 3, and the exhaust port 7A is located downstream of the cooling fans 25C, 25D, 26A, 27A and the shielding member 31 with respect to the flow direction of the cooling air F1, and discharges the cooling air F1 to the outside of the upper rotating body 3. According to this configuration, the cooling air F1 after passing through the heat exchange device 24 can be efficiently discharged to the outside of the upper rotating body 3 through the exhaust port 7A in a state collected by the shielding member 31.

[0059] In the embodiment, the driver's seat 9 is arranged at the front side in the front-rear direction of the upper rotating body 3, the hydrogen storage container 20 is arranged between the driver's seat 9 and the heat exchange device 24 with respect to the front-rear direction of the upper rotating body 3, and the exhaust port 7A passes through the hydrogen storage container 20 to discharge the cooling air F1 supplied to the heat exchange device 24 to the rear of the upper rotating body 3. According to this configuration, even if hydrogen gas is retained around the hydrogen storage container 20, the cooling air F1 supplied to the heat exchange device 24 can be used to discharge the hydrogen gas to the outside of the upper rotating body 3 through the exhaust port 7A in a manner of quickly moving away from the driver's seat 9.

[0060] In the embodiment, there is a controller 36 for controlling the rotation direction of the cooling fans 25C, 25D, 26A, and 27A, and a hydrogen sensor 32 for detecting hydrogen. When the hydrogen sensor 32 detects hydrogen around the hydrogen storage container 20, the controller 36 switches the rotation direction of the cooling fans 25C, 25D, 26A, and 27A in such a manner that the driver's seat 9 is on the upstream side of the hydrogen storage container 20 with respect to the flow direction of the cooling air F1. According to this configuration, when hydrogen exists around the hydrogen storage container 20, the controller 36 appropriately sets the rotation direction of the cooling fans 25E and 25F. As a result, the flow direction of the cooling air F1 can be changed in such a manner that the driver's seat 9 is on the upstream side of the hydrogen storage container 20. As a result, the hydrogen existing around the hydrogen storage container 20 can be sent out in a direction away from the driver's seat 9 and quickly discharged to the outside of the upper rotating body 3.

[0061] In the embodiment, the heat exchange device 24 includes a fuel cell radiator 25 for cooling the fuel cell 11 and a motor and inverter radiator 26 for cooling the electric motor 14 and the inverter 15 for controlling the electric motor 14. The fuel cell radiator 25 and the motor and inverter radiator 26 are provided with cooling fans 25C, 25D, and 26A, respectively. According to this configuration, when the heat generated by the fuel cell 11 is different from the heat generated by the electric motor 14 and the inverter 15, the rotation of the cooling fans 25C and 25D and the rotation of the cooling fan 26A can be independently controlled. As a result, the fuel cell 11, the electric motor 14, and the inverter 15 can be cooled to the optimal state.

[0062] Next, Figure 7 The second embodiment of the present invention is shown. The characteristic configuration of this embodiment is that the cooling wind supplied from the hydrogen storage container to the heat exchange device is discharged to the side of the upper rotating body. In the second embodiment, the same reference numerals are attached to the same components as those in the first embodiment, and their description is omitted.

[0063] In the figure, the upper rotating body 41 is similar to the upper rotating body 3 of the first embodiment, and includes a rotating frame 5, a counterweight 7, a cabin 8 provided with a driver's seat 9, etc., an exterior cover 10, a fuel cell 11, an electric motor 14, a hydraulic pump 16, a hydrogen storage container 20, and a heat exchange device 24. However, in this embodiment, the arrangement of the fuel cell 11, the electric motor 14, the hydraulic pump 16, the hydrogen storage container 20, and the heat exchange device 24 is different from that of the first embodiment.

[0064] In addition, the counterweight 7 of the present embodiment is not provided with an exhaust port 7A like the counterweight 7 of the first embodiment. Moreover, an exhaust port 10F is provided on the right side 10B of the exterior cover 10 of the present embodiment instead of the vent 10D of the first embodiment. The exhaust port 10F is composed of a large opening formed in almost the entire surface of the right side 10B.

[0065] The fuel cell 11 is located at the rear side compared to the cabin 8 and is mounted in the center of the left-right direction of the revolving frame 5. The electric motor 14 and the hydraulic pump 16 are arranged between the fuel cell 11 and the counterweight 7 in a state adjacent to each other in the left-right direction. A plurality of hydrogen storage containers 20 are adjacent to the right side (right frame 5C side) of the fuel cell 11 and the electric motor 14 and are mounted on the revolving frame 5. The plurality of hydrogen storage containers 20 are arranged in a state of being arranged in the up-down direction by the shelf 21 and in a state of extending in the front-rear direction of the revolving frame 5.

[0066] The heat exchange device 24 is located on the right side of the hydrogen storage container 20 and is mounted near the right side frame 5C of the revolving frame 5. The heat exchange device 24 is composed of a fuel cell radiator 25, a motor and inverter radiator 26, and an oil cooler 27. The fuel cell radiator 25, the motor and inverter radiator 26, and the oil cooler 27 are arranged in a row in the front-to-back direction along the right side frame 5C of the revolving frame 5, and face the outside of the upper revolving body 3 through the exhaust port 10F formed on the right side surface 10B of the exterior cover 10.

[0067] The fuel cell radiator 25 has two cooling units 25A and 25B, and is arranged adjacent to the front side of the counterweight 7. Cooling fans 25C and 25D are provided on the right side of the two cooling units 25A and 25B constituting the fuel cell radiator 25, respectively. The motor and inverter radiator 26 is arranged adjacent to the front side of the fuel cell radiator 25, and a cooling fan 26A is provided on the right side of the motor and inverter radiator 26. The oil cooler 27 is arranged adjacent to the front side of the motor and inverter radiator 26, and a cooling fan 27A is provided on the right side of the oil cooler 27.

[0068] By the rotation of these cooling fans 25C, 25D, 26A, and 27A, the outside air flows into the inside of the outer cover 10 through the vent 10D formed on the left side 10A of the outer cover 10. The outside air becomes the cooling air F3 from the left side 10A of the outer cover 10 toward the right side 10B indicated by the solid arrow, and is discharged to the outside of the upper rotating body 3 (outer cover 10) through the exhaust port 10F on the right side 10B. At this time, heat is released from the fuel cell radiator 25, the motor and inverter radiator 26, and the oil cooler 27 into the cooling air F3, and the fuel cell 11, the auxiliary machine, the electric motor 14, the inverter 15, and the working oil are cooled.

[0069] On the other hand, when the cooling fans 25C, 25D, 26A, and 27A are rotated in the opposite direction to the above, the outside air flows into the inside of the exterior cover 10 through the exhaust port 10F formed on the right side 10B of the exterior cover 10. The outside air becomes the cooling air F4 indicated by the dotted arrow from the right side 10B to the left side 10A of the exterior cover 10, and passes through the vent 10D on the left side 10A to be discharged to the outside of the upper rotating body 3. Thus, the heat generated from the fuel cell radiator 25, the motor and inverter radiator 26, and the oil cooler 27 is released into the cooling air F4.

[0070] The upper rotating body 41 of the present embodiment has the above-described structure, and the cooling air F3 indicated by the solid arrow or the cooling air F4 indicated by the dotted arrow is generated in the exterior cover 10 according to the rotation direction of the cooling fans 25C, 25D, 26A, and 27A. In addition, the heat generated by the fuel cell radiator 25, the motor and inverter radiator 26, and the oil cooler 27 is released into the cooling air F3 or the cooling air F4, thereby cooling the fuel cell 11 and the auxiliary machine, the electric motor 14 and the inverter 15, and the working oil.

[0071] On the other hand, when new hydrogen is filled into the hydrogen storage container 20 from the hydrogen supply device, for example, when hydrogen leaks and accumulates around the hydrogen storage container 20 due to an abnormality of the hydrogen supply device, the controller 36 sets the rotation direction of the cooling fans 25C, 25D, 26A, and 27A in such a way that the cooling wind F3 is generated in the outer cover 10. That is, when the cooling wind F3 is generated, the rotation direction is maintained, and when the cooling wind F4 is generated, the rotation direction is changed to the opposite direction. As a result, the hydrogen accumulated around the hydrogen storage container 20 can be discharged to the outside of the upper rotating body 41 through the exhaust port 10F of the outer cover 10 (right side 10B) by utilizing the cooling wind F4. As a result, the hydrogen existing around the hydrogen storage container 20 can be sent in a direction away from the driver's seat 9 and quickly discharged to the outside of the upper rotating body 3.

[0072] Next, Figure 8 The third embodiment of the present invention is shown. The characteristic configuration of this embodiment is that the cooling fan is arranged to be tilted upward. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and their description is omitted.

[0073] In the figure, the upper rotating body 51 is similar to the upper rotating body 3 of the first embodiment, and includes a rotating frame 5, a counterweight 7, a cabin 8 provided with a driver's seat 9, etc., an exterior cover 10, a fuel cell 11, an electric motor 14, a hydraulic pump 16, a hydrogen storage container 20, and a heat exchange device 24. However, in this embodiment, the arrangement of cooling fans 25C, 25D, 26A, and 27A constituting the heat exchange device 24 is different from that in the first embodiment.

[0074] The heat exchange device 24 is configured similarly to the first embodiment, and includes a fuel cell radiator 25, a motor and inverter radiator 26, and an oil cooler 27. The fuel cell radiator 25 includes cooling fans 25C and 25D, the motor and inverter radiator 26 includes a cooling fan 26A, and the oil cooler 27 includes a cooling fan 27A. Here, if the rotation axis of the cooling fan 25C is denoted by A-A and the straight line extending in the horizontal direction of the upper rotating body 4 is denoted by B-B, the rotation axis A-A of the cooling fan 25C is inclined upward at an angle θ relative to the straight line B-B in the horizontal direction. Similarly, the rotation axes of the cooling fan 25D of the fuel cell radiator 25, the cooling fan 26A of the motor and inverter radiator 26, and the cooling fan 27A of the oil cooler 27 are also inclined upward at an angle θ relative to the straight line B-B in the horizontal direction.

[0075] Thus, in the present embodiment, the cooling fans 25C and 25D of the fuel cell radiator 25, the cooling fan 26A of the motor and inverter radiator 26, and the cooling fan 27A of the oil cooler 27 are arranged to be tilted upward relative to the horizontal direction of the upper rotating body 3. Thus, the cooling air F5 indicated by the solid arrows passing through the fuel cell radiator 25, the motor and inverter radiator 26, and the oil cooler 27 passes through the exhaust port 7A of the counterweight 7 and is discharged from the upper rotating body 51 upward compared to the horizontal direction.

[0076] The upper rotating body 51 of the present embodiment has the structure as described above, and its basic function and effect are not particularly different from those of the first embodiment. However, according to the present embodiment, the cooling fans 25C, 25D, 26A, and 27A constituting the heat exchange device 24 are arranged to be tilted upward relative to the horizontal direction of the upper rotating body 51. As a result, it is possible to suppress the cooling wind that has passed through the heat exchange device 24 and has been heated from blowing toward the operator who is located behind the counterweight 7. In addition, when the hydrogen gas retained around the hydrogen storage container 20 is discharged to the outside of the upper rotating body 51 by the cooling wind, the hydrogen gas can be discharged upward from the exhaust port 7A of the counterweight 7. Therefore, it is not necessary to provide an air vent for discharging hydrogen gas that is lighter than air on the upper surface 10C of the outer cover 10, and it is possible to prevent rainwater from passing through the air vent and invading the outer cover 10.

[0077] Next, Fig. 9 as well as Fig.10 The fourth embodiment of the present invention is shown. The characteristic configuration of this embodiment is that the heat exchange device is connected to a plurality of cooling units, and the cooling fan is arranged to be tilted upward. In addition, in the fourth embodiment, the same reference numerals are given to the same components as those in the first embodiment, and their description is omitted.

[0078] In the figure, the upper rotating body 61 is similar to the upper rotating body 3 of the first embodiment, and includes a rotating frame 5, a counterweight 7, a cabin 8 provided with a driver's seat 9, etc., an exterior cover 10, a fuel cell 11, an electric motor 14, a hydraulic pump 16, a hydrogen storage container 20, and a heat exchange device 62. However, in this embodiment, the structure of the heat exchange device 62 is different from the heat exchange device 24 of the first embodiment.

[0079] The heat exchange device 62 is similar to the heat exchange device 24 of the first embodiment, and is located between the counterweight 7 and the hydrogen storage container 20 and mounted on the rear side of the revolving frame 5. The heat exchange device 62 is composed of a fuel cell radiator 63, a motor and inverter radiator 64, and an oil cooler 65. The fuel cell radiator 63, the motor and inverter radiator 64, and the oil cooler 65 are arranged in a row in the left-right direction of the revolving frame 5, and face the outside of the upper revolving body 61 through the exhaust port 7A of the counterweight 7.

[0080] The fuel cell radiator 63 is formed by connecting a plurality of (e.g., four) cooling units 63A, 63B, 63C, and 63D. A cooling fan 63E is disposed between the cooling units 63A and 63B, and a cooling fan 63F is disposed between the cooling units 63C and 63D. Here, the rotation axes A-A of the cooling fans 63E and 63F are inclined upward at an angle θ relative to the horizontal straight line B-B.

[0081] The motor and inverter radiator 64 is formed by connecting a plurality of (e.g., two) cooling units 64A and 64B. A cooling fan 64C is disposed between the cooling units 64A and 64B. The oil cooler 65 is formed by connecting a plurality of (e.g., two) cooling units 65A and 65B. A cooling fan 65C is disposed between the cooling units 65A and 65B. Here, the rotation axes of the cooling fans 64C and 65C are inclined upward at an angle θ relative to the horizontal direction, similarly to the cooling fans 63E and 63F of the fuel cell radiator 63.

[0082] The upper rotating body 61 of the present embodiment has the above-described structure, and its basic function and effect are not particularly different from those of the first embodiment. However, according to the present embodiment, the cooling fans 63E, 63F, 64C, and 65C constituting the heat exchange device 62 are arranged to be tilted upward relative to the horizontal direction of the upper rotating body 61. Thus, it is possible to suppress the cooling air heated by passing through the heat exchange device 62 from being blown toward the operator who is located behind the counterweight 7. In addition, when the hydrogen gas retained around the hydrogen storage container 20 is discharged to the outside of the upper rotating body 61 by the cooling air, the hydrogen gas can be discharged upward from the exhaust port 7A of the counterweight 7.

[0083] Moreover, according to the present embodiment, the fuel cell radiator 63 of the heat exchange device 62 is formed by connecting a plurality of cooling units 63A, 63B, 63C, and 63D. Similarly, the motor and inverter radiator 64 is formed by connecting a plurality of cooling units 64A and 64B, and the oil cooler 65 is formed by connecting a plurality of cooling units 65A and 65B. Therefore, compared with the case of setting a single fuel cell radiator 63 with a large volume, the degree of freedom when setting a plurality of cooling units 63A, 63B, 63C, and 63D can be increased with respect to the upper rotating body 61 where the installation space of the equipment is limited. This effect is also the same for the motor and inverter radiator 64 and the oil cooler 65.

[0084] In addition, in the embodiment, when hydrogen gas leaks from the outer cover 10 and stays around the hydrogen storage container 20 during the filling operation of hydrogen gas relative to the hydrogen storage container 20, the controller 36 detects the hydrogen gas and discharges the hydrogen gas to the outside of the upper rotating body 3 (outer cover 10). However, the present invention is not limited to this, and may also be configured as follows, for example Fig.11 As shown in the first modified example, when the pressure in the hydrogen container 20 or the pressure in the hydrogen gas pipeline 22 (pressure circuit) decreases, the controller 36 determines that there is a possibility of hydrogen gas around the hydrogen container 20 and discharges the air in the outer cover 10 to the outside.

[0085] Fig.11 : represents the control process executed by the controller 36. In step S11, the controller 36 reads the pressure in the hydrogen storage container 20 or the pressure in the hydrogen gas pipeline 22, and in step S12, determines whether it is an abnormal value indicating an abnormal pressure drop. If the controller 36 determines "yes" in step S12, in step S13, it determines that the pressure in the hydrogen storage container 20 or the hydrogen gas pipeline 22 is abnormally reduced, and transfers to step S14.

[0086] In step S14, the controller 36 sets the rotation direction of the cooling fans 25C, 25D, 26A, and 27A so that the driver's seat 9 is located on the upstream side of the hydrogen storage container 20 with respect to the flow direction of the cooling air, and in step S15, increases the rotation speed of the cooling fan 25C, etc. Then, in step S16, the controller 36 reads the pressure in the hydrogen storage container 20 or the hydrogen gas pipeline 22, and in step S17, determines whether the pressure is an abnormal value.

[0087] If the controller 36 determines "yes" in step S17, it continues the control after step S14. If the controller 36 determines "no" in step S17, it switches the cooling fans 25C, 25D, 26A, and 27A to normal operation in step S18, and ends the control process. Thus, it is also possible to configure that when it is suspected that hydrogen exists around the hydrogen storage container 20, the air in the outer cover 10 is exhausted to the outside.

[0088] In this case, the determination of whether there is a possibility of hydrogen gas existing around the hydrogen storage container 20 may be performed based on whether the remaining amount of hydrogen gas in the hydrogen storage container 20 is abnormally reduced. Fig.11 In step S11 and step S16, the remaining amount of hydrogen in the hydrogen storage container 20 is read, and in step S12 and step S17, it is determined whether the remaining amount of hydrogen is an abnormal value that is abnormally reduced.

[0089] In addition, in the first embodiment, the case where the fuel cell radiator 25, the motor and inverter radiator 26, and the oil cooler 27 constituting the heat exchange device 24 are arranged from the left side to the right side of the revolving frame 5 is exemplified. However, the present invention is not limited to this, and the fuel cell radiator 25, the motor and inverter radiator 26, and the oil cooler 27 are arranged in a different order with respect to the left-right direction of the revolving frame 5. Similarly, in the second embodiment, the fuel cell radiator 25, the motor and inverter radiator 26, and the oil cooler 27 are arranged in a different order with respect to the front-rear direction of the revolving frame 5.

[0090] Description of Reference Numerals

[0091] 2 Lower running body (body)

[0092] 3, 41, 51, 61 upper rotating body (car body)

[0093] 7. Counterweight

[0094] 7A exhaust port

[0095] 9 Driver's Seat

[0096] 10Exterior cover

[0097] 10F exhaust port

[0098] 11. Fuel Cell

[0099] 14 Electric Motor

[0100] 20 Hydrogen storage container

[0101] 24, 62 heat exchange device

[0102] 25.63 Radiator for fuel cell

[0103] 25C, 25D, 26A, 27A, 63E, 63F, 64C, 65C cooling fans

[0104] 26, 64 Radiators for motors and inverters

[0105] 27, 65 oil cooler

[0106] 31 shielding parts

[0107] 32 Hydrogen Sensor

[0108] 36 controllers.

Claims

1. An engineering machine having a self-propelled vehicle body, The vehicle body has: a driver's seat; a fuel cell that generates power supplied to an electric motor; a hydrogen storage container that stores hydrogen supplied to the fuel cell; a heat exchanger for cooling the fuel cell; and a cooling fan that supplies cooling air to the heat exchanger. The engineering machine is characterized in that: The driver's seat is disposed on an upstream side of the hydrogen storage container with respect to a flow direction of the cooling air generated by the cooling fan.

2. The construction machine according to claim 1, characterized in that: A shielding member is provided for guiding the cooling air toward the heat exchanger. The cooling fan and the shielding member are arranged on a downstream side of the hydrogen storage container with respect to a flow direction of the cooling air.

3. The construction machine according to claim 1, characterized in that: The heat exchanger is disposed on a downstream side of the hydrogen storage container with respect to a flow direction of the cooling air.

4. The construction machine according to claim 2, characterized in that: An exhaust port is provided which is located on a downstream side of the cooling fan and the shielding member with respect to a flow direction of the cooling air and discharges the cooling air to the outside of the vehicle body.

5. The engineering machine according to claim 4, characterized in that: The driver's seat is arranged at the front side of the vehicle body in the front-rear direction. The hydrogen storage container is arranged between the driver's seat and the heat exchanger with respect to the front-rear direction of the vehicle body. The exhaust port discharges the cooling air supplied from the hydrogen storage container to the heat exchanger toward the rear of the vehicle body.

6. The engineering machine according to claim 4, characterized in that: The driver's seat is arranged on one side of the vehicle body in the left-right direction. The hydrogen storage container is arranged between the driver's seat and the heat exchanger with respect to the left-right direction of the vehicle body. The exhaust port discharges the cooling air supplied from the hydrogen storage container to the heat exchanger to the side.

7. The engineering machine according to claim 1, characterized in that: have: a controller for controlling the rotation direction of the cooling fan; and Hydrogen sensors that detect hydrogen gas, When the hydrogen sensor detects hydrogen gas around the hydrogen tank, the controller switches the rotation direction of the cooling fan so that the driver's seat is located upstream of the hydrogen tank with respect to the flow direction of the cooling air.

8. The engineering machine according to claim 1, characterized in that: The cooling fan is arranged to be tilted upward.

9. The engineering machine according to claim 1, characterized in that: The heat exchanger includes a fuel cell radiator for cooling the fuel cell and a motor and inverter radiator for cooling the electric motor and an inverter for controlling the electric motor. The cooling fans are provided separately at the radiator for the fuel cell and the radiator for the motor and inverter.

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