Construction machine

Abstract

To provide a construction machine capable of storing water generated from a fuel cell device at a location away from the fuel cell device.SOLUTION: The construction machine includes: a lower carriage 1; an upper rotating body 2 that is rotatably supported with respect to the lower carriage 1; a fuel cell unit 42 mounted on the upper rotating body 2; an outlet 32 for discharging water generated by the fuel cell unit 42 as wastewater; and a storage tank 80 for storing wastewater discharged from the outlet 32. The outlet 32 is located on the underside surface of the upper rotating body 2 or below the same. The tank 80 is placed on the lower carriage 2.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a construction machine driven by a fuel cell device as a power source. [Background technology]

[0002] Construction machinery powered by hydrogen fuel cells has been proposed. One example is the machine described in Patent Document 1. The machine described in Patent Document 1 includes a fuel cell as an energy storage system, and at least a portion of the energy storage system is installed as part of the counterweight. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-9589 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if wastewater from a fuel cell device stagnates, it can hinder the drainage of water produced by the fuel cell device, resulting in a decrease in the operating efficiency of the fuel cell device. Particularly at low temperatures, the stagnant water may freeze, further reducing the operating efficiency of the fuel cell device. Furthermore, if the water produced by the fuel cell device is drained on the spot, the wastewater may adhere to the undercarriage, causing rust, or may be unintentionally discharged at work sites where drainage is not desirable.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide a construction machine that can store water produced by a fuel cell device at a location away from the fuel cell device. [Means for solving the problem]

[0006] The construction machine of the first aspect comprises a lower running body, an upper rotating body supported so as to be rotatable relative to the lower running body, a fuel cell device mounted on the upper rotating body, an outlet for discharging water generated by the fuel cell device as wastewater, and a storage section for storing the wastewater discharged from the outlet, wherein the outlet is located on the underside of the upper rotating body or below the underside, and the storage section is located on the lower running body.

[0007] In the work machine according to the first aspect, water produced by the fuel cell device can be stored in a storage unit arranged on the undercarriage located away from the fuel cell device. Specifically, wastewater discharged from the outlet of the fuel cell device mounted on the upper rotating body is guided by gravity, preventing the wastewater from accumulating on the upper rotating body. Furthermore, because the wastewater discharged from the outlet is stored in a storage unit arranged on the undercarriage away from the fuel cell device, it is possible to prevent the wastewater from adhering to the undercarriage and causing rust, and to prevent wastewater from being discharged at work sites where discharge is undesirable.

[0008] A construction machine according to a second aspect is preferably the construction machine according to the first aspect, further comprising the following feature: That is, in the construction machine according to the second aspect, the undercarriage has an opening into which a liquid can be poured, and the storage unit stores the wastewater poured into the opening as the liquid. According to the second aspect, the wastewater discharged from the drain outlet can be stored in the storage unit via an opening formed in the undercarriage.

[0009] The construction machine according to the third aspect is preferably the construction machine according to the second aspect, further comprising the following feature: In the construction machine according to the third aspect, the opening is formed in the upper part of the storage section. According to the third aspect, the opening is configured integrally with the storage section, allowing for a compact configuration, and the drainage water received at the opening can be stored directly in the storage section.

[0010] A construction machine according to a fourth aspect is preferably the construction machine according to the second aspect, further comprising the following feature: That is, in the construction machine according to the fourth aspect, the lower traveling body is provided with a second storage section disposed above the storage section and configured to receive the wastewater poured into the opening, and a water conveying mechanism configured to guide the wastewater received in the second storage section to the storage section. According to the fourth aspect, the wastewater discharged from the discharge port is collected and temporarily stored in the second storage section, and then the wastewater is guided to the storage section via the water conveying mechanism and stored in the storage section. Therefore, the storage section and the second storage section can be disposed in separate locations.

[0011] A construction machine according to a fifth aspect is preferably the construction machine according to any one of the second to fourth aspects, further comprising the following feature: In the construction machine according to the fifth aspect, the opening is located vertically below the discharge outlet. According to the fifth aspect, since the opening is located vertically below the discharge outlet, it becomes easier to collect the wastewater discharged from the discharge outlet.

[0012] A construction machine according to a sixth aspect is preferably the construction machine according to the fifth aspect, further comprising the following feature: That is, in the construction machine according to the sixth aspect, when an imaginary circle is imagined whose radius is the distance between the center of a slewing ring connecting the upper rotating body to the lower running body and the discharge outlet, the opening is arranged so that the upper rotating body can rotate relative to the lower running body. According to the sixth aspect, since the opening is located vertically below the imaginary circle, it is easy to collect wastewater discharged from the discharge outlet.

[0013] The construction machine according to the seventh aspect is preferably the construction machine according to the sixth aspect, further comprising the following feature: In other words, in the construction machine according to the seventh aspect, the opening is arranged so as to be located vertically below an area extending from between the circle and the center of rotation to a position outside the circle when viewed from above. According to the seventh aspect, since the opening is located so as to extend from the inside to the outside of the circle, it becomes even easier to collect the wastewater discharged from the discharge port.

[0014] The construction machine according to an eighth aspect is preferably the construction machine according to any one of the first to seventh aspects, further comprising the following feature. That is, the construction machine according to the eighth aspect includes a slewing ring that connects the upper slewing body to the undercarriage so that the upper slewing body can swivel relative to the undercarriage, and the discharge outlet is located between the center of rotation of the slewing ring and the slewing ring when viewed from above. According to the eighth aspect, since the discharge outlet is located inside the slewing ring, the discharge outlet is surrounded by the slewing ring, making it difficult for soil, dust, etc. to enter the storage section. In addition, the heat of the wastewater and steam discharged from the discharge outlet is less likely to have an effect on the surroundings of the construction machine.

[0015] A construction machine according to a ninth aspect is preferably the construction machine according to any one of the first to seventh aspects, further comprising the following feature: The construction machine according to the ninth aspect includes a slewing ring that connects the upper rotating body to the lower running body so that the upper rotating body can swivel relative to the lower running body, and the discharge outlet is located at a position outside the slewing ring when viewed from above. According to the ninth aspect, drainage is possible even if the discharge outlet cannot be located near the center of rotation due to strength issues, space limitations, etc.

[0016] A construction machine according to a tenth aspect is preferably the construction machine according to any one of the first to ninth aspects, further comprising the following feature: In other words, in the construction machine according to the tenth aspect, the storage section is provided with an openable drain plug for discharging the wastewater stored in the storage section to the outside of the storage section. According to the tenth aspect, by opening the drain plug, the wastewater stored in the storage section can be discharged at an appropriate time.

[0017] The construction machine according to an eleventh aspect is preferably the construction machine according to any one of the first to tenth aspects, further comprising the following feature: In other words, in the construction machine according to the eleventh aspect, the lower traveling body comprises a pair of left and right crawlers and a car body connecting the pair of left and right crawlers, and the storage unit is disposed within the car body. According to the eleventh aspect, the storage unit is protected by the car body and can be disposed compactly on the lower traveling body. [Effects of the Invention]

[0018] According to the present disclosure, a construction machine is provided that can store water produced in a fuel cell device in a storage section arranged in a lower traveling body at a position away from the fuel cell device. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a side view showing a construction machine according to an embodiment. [Figure 2] 2 is a diagram showing the inside of a machine room of the construction machine of FIG. 1, and is a cross-sectional view taken along line II-II of FIG. [Figure 3] FIG. 2 is a perspective view showing the vehicle frame and the fuel cell device. [Figure 4] FIG. 4 is an enlarged perspective view of a portion surrounded by a dashed line in FIG. 3. [Figure 5] 5 is a right side view of the part shown in FIG. 4 as seen in the direction indicated by arrow V. FIG. [Figure 6] FIG. 2 is a schematic diagram showing a structure for guiding water discharged from a drain outlet of a fuel cell device to a tank. [Figure 7] FIG. 7 is a schematic diagram showing the positional relationship between the tank, the swivel joint, the swivel bearing, and the grease bath portion shown in FIG. 6. [Figure 8] FIG. 10 is a schematic diagram showing a structure for guiding wastewater discharged from a device drain outlet of a fuel cell device to a tank in a second embodiment. [Figure 9] FIG. 9 is a schematic diagram showing the positional relationship between the outlet of the drain pipe, the fuel cell device, the annular receiving portion, and the tank shown in FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0020] Embodiments of the present disclosure will be described with reference to the drawings.

[0021] [Overall structure] 1 and 2, the construction machine 10 includes a lower traveling structure 1 including a traveling device, an upper rotating structure 2 supported to be rotatable relative to the lower traveling structure 1 about a vertically extending rotation axis Z (rotation center), and a working device 3 supported by the upper rotating structure 2. The construction machine 10 according to this embodiment is a hydraulic excavator, but the construction machine in this disclosure is not limited to hydraulic excavators and may be other construction machines such as a crane or a bulldozer. The traveling device may be a crawler traveling device as shown in FIG. 1, or may be a traveling device having tires (not shown).

[0022] The front-rear direction and left-right direction shown in the drawings are directions based on the orientation of the upper rotating body 2. Specifically, the front-rear direction is a horizontal direction parallel to the longitudinal direction of the working device 3 in a plan view, and the left-right direction is a horizontal direction perpendicular to the front-rear direction.

[0023] The work device 3 includes a boom 4 that is attached to the upper rotating body 2 so that it can be raised and lowered, an arm 5 that is attached to the boom 4 so that it can rotate, and a tip attachment 6 that is attached to the arm 5 so that it can rotate. In this embodiment, the tip attachment 6 is a bucket, but the tip attachment may be another tip attachment such as a grapple, fork, or crusher.

[0024] The upper rotating body 2 includes a machine frame 20, a cab 11 supported by the machine frame 20, a counterweight 12, and an outer wall 13. The outer wall 13 has, for example, a box shape and defines a machine room 14. Various pieces of equipment are housed inside the machine room 14. The various pieces of equipment housed in the machine room 14 will be described later.

[0025] The machine frame 20 is a member that is rotatably supported on the undercarriage 1. The machine frame 20 includes a frame main body 21 and a rising body 22. The frame main body 21 supports the cab 11 and the outer wall 13. The frame main body 21 has an upper surface that extends in the front-to-rear and left-to-right directions and is large enough to support the cab 11 and the outer wall 13. The rising body 22 supports the boom 4 so that it can be raised and lowered. The rising body 22 includes a boom mounting portion 22A to which the base end portion 4A of the boom 4, shown by the dashed line in FIG. 1, is attached. The boom mounting portion 22A forms the front portion of the rising body 22.

[0026] The cab 11 is disposed, for example, at the left front portion of the frame body 21. The counterweight 12 is a weight for balancing, and is disposed at the rear of the frame body 21 or further rearward than the frame body 21. The cab 11 is equipped with a driver's seat, operating levers, operating pedals, etc.

[0027] 1, the rising body 22 has a shape that stands up from the frame main body 21 and extends in the front-to-rear direction. The rising body 22 includes a rear portion 22B that is located rearward of the boom mounting portion 22A (front portion). The rear portion 22B is located rearward of the boom mounting portion 22A and is lower in height than the boom mounting portion 22A.

[0028] 1, 2, and 3, the upright body 22 includes left and right upright plates 23, 23 that face each other at a distance from each other on the left and right. Each of the left and right upright plates 23, 23 is a plate-like member that stands upright from the frame main body 21 and is disposed so as to extend in the front-rear direction.

[0029] The construction machine 10 is equipped with a plurality of actuators. Each of the plurality of actuators is operated by receiving a supply of hydraulic oil discharged from a hydraulic pump 62, which will be described later. 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 hydraulic motor 64 for rotating the upper rotating body 2 relative to the lower traveling body 1, and travel motors (left traveling motor, right traveling motor) (not shown) for traveling the lower traveling body 1.

[0030] The machinery room 14 accommodates a plurality of equipment groups, which will be described later. The machinery room 14 is formed in the space on the top surface of the frame body 21, excluding the area where the cab 11 is located, the area where the base end 4A of the boom 4 is attached, and the area where the counterweight 12 is located. The machinery room 14 may be formed, for example, in a rear space that is the space behind the cab 11, or in a side space that is the space to the side (for example, to the right) of the cab 11, or may be formed in both the rear space and the side space. Note that if the weight of the equipment accommodated inside the machinery room 14 is heavy, the counterweight 12 can be omitted.

[0031] The outer wall 13 has, for example, a box shape and defines a machine chamber 14. As shown in FIGS. 1 and 2 , an air intake port 16 and an exhaust port 17 are formed in the outer wall 13. The air intake port 16 is an opening for drawing air outside the machine 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. There are no particular limitations on the locations where the air intake port 16 and the exhaust port 17 are formed, but in this embodiment, the air intake port 16 is formed on a side portion (e.g., the right side) of the outer wall 13, and the exhaust port 17 is formed on another side portion (e.g., the left side) of the outer wall 13.

[0032] The construction machine 10 includes a plurality of equipment groups. The plurality of equipment groups include a hydrogen equipment group 40, a high-voltage equipment group 50, a hydraulic equipment group 60, and a cooling equipment group 70. In the specific example shown in Fig. 2, the hydrogen equipment group 40 is arranged in an area near the center of the rear of the upper rotating body 2, the cooling equipment group 70 is arranged in an area near the left side of the rear of the upper rotating body 2, and the high-voltage equipment group 50 and the hydraulic equipment group 60 are arranged in areas other than these, but the areas in which each equipment group is arranged are not limited to the specific example shown in Fig. 2.

[0033] The hydrogen equipment group 40 includes a hydrogen tank 41, a fuel cell device 42, and a hydrogen filling port 44. The hydrogen tank 41 is connected to the fuel cell device 42 via a fuel pipe 40A. The hydrogen filling port 44 is connected to the hydrogen tank 41 via a hydrogen filling pipe 40B.

[0034] The hydrogen tank 41 is a container for storing hydrogen. In this embodiment, the hydrogen tank 41 is disposed above the fuel cell device 42. The hydrogen tank 41 may be supported by a tank support member (not shown) in the machine room 14. A pressure reducing valve 45 may be disposed in the fuel pipe 40A. In this case, the high-pressure hydrogen stored in the hydrogen tank 41 is reduced in pressure by the pressure reducing valve 45. The reduced-pressure hydrogen is supplied to the fuel cell device 42 via the fuel pipe 40A.

[0035] The fuel cell device 42 is mounted on the upper rotating body 2 and includes a fuel cell 42A. The fuel cell 42A generates electricity (power) by causing an electrochemical reaction between hydrogen supplied from the hydrogen tank 41 and oxygen (for example, oxygen contained in the air). The fuel cell 42A may be configured, for example, by a fuel cell stack including a plurality of cells.

[0036] The hydrogen filling port 44 has a filling port that communicates with the hydrogen filling pipe 40B. During the filling operation of filling the hydrogen tank 41 with hydrogen, a nozzle of a hydrogen gas filling device (not shown) is connected to the hydrogen filling port 44, thereby filling the hydrogen tank 41 with hydrogen. Once filling of the hydrogen tank 41 with hydrogen is complete, the nozzle of the hydrogen gas filling device is removed from the hydrogen filling port 44.

[0037] The high-voltage equipment group 50 includes an inverter 51 and an electric motor 52. The inverter 51 is connected to the fuel cell device 42 by a cable (not shown). The inverter 51 is connected to the electric motor 52 by a cable (not shown).

[0038] The inverter 51 converts the direct current supplied from the fuel cell device 42 into a three-phase alternating current and supplies it to the electric motor 52. The inverter 51 adjusts the rotation speed of the electric motor 52.

[0039] The electric motor 52 is a drive source that drives the hydraulic pump 62. The electric motor 52 is operated by receiving a supply of electric power from the fuel cell device 42 via an inverter 51. The electric motor 52 is configured as, for example, a three-phase motor.

[0040] The high-voltage equipment group 50 may further include a battery 53. The battery 53 may be, for example, a lithium-ion battery or another type of battery. The electric motor 52 may be operated by receiving power output from the battery 53 via an inverter 51. The inverter 51 may convert the direct current supplied from the battery 53 into three-phase alternating current and supply it to the electric motor 52. The battery 53 may also be charged by receiving power from the fuel cell device 42.

[0041] The high-voltage equipment group 50 may further include a repeater (junction box) 55. The repeater 55 has a function of combining the power output by the fuel cell device 42 and the power output by the battery 53, and a function of distributing the power to a plurality of high-voltage equipment such as the inverter 51 and a converter 54 described below.

[0042] The high-voltage equipment group 50 may further include a converter 54 (DC-DC converter). The converter 54 steps down the high voltage output from the repeater 55. The converter 54 supplies the stepped-down low-voltage power to the low-voltage equipment group.

[0043] The hydraulic equipment group 60 includes a hydraulic oil tank 61, a hydraulic pump 62, a control valve 63, and a hydraulic motor 64. The hydraulic oil tank 61 is a container that stores hydraulic oil. The hydraulic pump 62 is driven by the electric motor 52 and discharges hydraulic oil. The hydraulic pump 62 is connected to the electric motor 52 via a shaft connection coupling (not shown). The hydraulic motor 64 is operated by receiving hydraulic oil from the hydraulic pump 62 via a control valve 63. The control valve 63 opens and closes in response to a lever operation or pedal operation applied by the operator to an operating device (not shown) so that hydraulic oil from the hydraulic pump 62 is supplied to an actuator corresponding to that operation.

[0044] The cooling equipment group 70 includes a cooling fan 71 and a heat exchanger. The heat exchanger may include at least one of an oil cooler 72 and a radiator 73.

[0045] The cooling fan 71 forms a flow of cooling air CA in the machine room 14. That is, the cooling fan 71 forms a flow of cooling air CA in the machine room 14 from the intake port 16 to the exhaust port 17. The cooling fan 71 has an impeller including a rotating shaft and a plurality of blades arranged along the outer periphery of the rotating shaft, and a fan motor that drives the impeller. The impeller of the cooling fan 71 rotates when power is supplied to the fan motor from the fuel cell device 42 or the battery 53 via the repeater 55, for example. The cooling fan 71 may further have a shroud that is arranged to surround the impeller.

[0046] The oil cooler 72 may be configured to cool the hydraulic oil discharged from the equipment included in the hydraulic equipment group 60. The hydraulic oil discharged from the control valve 63 reaches the oil cooler 72 via an oil cooler hose (not shown), where it is cooled by heat exchange with cooling air CA, and then returns to the hydraulic oil tank 61 via the oil cooler hose (not shown). In this way, the hydraulic oil is cooled.

[0047] The radiator 73 may be configured to cool the fuel cell device 42. Specifically, for example, the radiator 73 may be connected to the fuel cell device 42 via radiator hoses 74 and 75. Coolant is circulated between the fuel cell device 42 and the radiator 73 by a water pump. The coolant is cooled by heat exchange with the cooling air CA in the radiator 73, and is supplied to the fuel cell device 42 via the radiator hose 74. In this way, the fuel cell device 42 is cooled by the coolant. The coolant that has passed through the fuel cell device 42 returns to the radiator 73 via the radiator hose 75.

[0048] [First embodiment] Next, the features of the construction machine 10 according to this embodiment will be described with reference to FIGS.

[0049] The fuel cell device 42 has an device drain outlet 43 for discharging water generated within the fuel cell device 42 as wastewater. The construction machine 10 has a drain pipe 30 connected to the device drain outlet 43. The drain pipe 30 is arranged at a position below the height of the device drain outlet 43. In a construction machine 10 with this feature, water discharged from the device drain outlet 43 of the fuel cell device 42 is less likely to stagnate in the drain pipe 30 compared to, for example, a case in which the drain pipe 30 is arranged upward toward the top of the upper rotating body 2 (machine body).

[0050] By making it difficult for water to accumulate inside the drain pipe 30, it is possible to prevent the water inside the drain pipe 30 from freezing in a low-temperature environment of, for example, 0°C or below. Furthermore, by making it difficult for water to accumulate inside the drain pipe 30, it is possible to prevent water from accumulating inside the fuel cell device 42. By making it difficult for water to accumulate inside the fuel cell device 42, it is possible to prevent the reaction between hydrogen and oxygen in the fuel cell device 42 from being inhibited.

[0051] The drain pipe 30 has a pipe inlet 31 connected to the device drain outlet 43, and is located at a height below the pipe inlet 31. The drain pipe 30 may be arranged so that the entire drain pipe 30 is at the same height as the device drain outlet 43, but it is preferable that the pipe inlet 31 of the drain pipe 30 and the base end portion nearby are at the same height as the device drain outlet 43, and that the portion other than the pipe inlet 31 and the base end portion is lower than the device drain outlet 43.

[0052] The fuel cell device 42 may include a case 42B that houses the fuel cell 42A, and in this case, the device drain outlet 43 may be formed in the case 42B. In this embodiment, the device drain outlet 43 is formed in the side surface of the case 42B, but the location where the device drain outlet 43 is formed is not limited to the side surface of the case 42B, and may be, for example, the bottom surface or the top surface of the case 42B. More specifically, the device drain outlet 43 is formed in the lower part of the side surface of the case 42B.

[0053] In the fuel cell device 42, water (water vapor) is produced by a chemical reaction, and the produced water is discharged as wastewater from the device drain outlet 43. The water (wastewater) discharged from the device drain outlet 43 of the fuel cell device 42 may contain both liquid water and gaseous water (water vapor), or may contain only either liquid water or gaseous water (water vapor).

[0054] The drain pipe 30 has an outlet 32. The outlet 32 ​​is the outlet of the drain pipe 30 that is connected to the device outlet 43. That is, the outlet 32 ​​discharges water generated in the fuel cell device 42 as wastewater. The outlet 32 ​​is located lower than the device outlet 43. In this case, water in the drain pipe 30 is more easily discharged from the outlet 32, making it less likely that water will stagnate in the drain pipe 30.

[0055] The drain pipe 30 preferably has a shape that encourages water in the drain pipe 30 to flow toward the outlet 32 ​​under its own weight. In this embodiment, the drain pipe 30 has the downstream side at the same height as the upstream side, or the downstream side located lower than the upstream side, along its entire length. In other words, it does not have any portion where the downstream side is located higher than the upstream side (a portion where the downstream side extends upward parallel to the vertical direction more than the upstream side, and a portion where the downstream side extends diagonally upward more than the upstream side). This makes it even less likely that water will stagnate in the drain pipe 30.

[0056] When the device drain outlet 43 is formed on the side surface of the fuel cell device 42 (side surface of the case 42B) as in this embodiment, the drain pipe 30 may include a horizontal portion 30A (upstream horizontal portion 30A) that extends laterally from the device drain outlet 43 and a downward portion 30B that extends downward from the horizontal portion 30A, in which case the discharge port 32 may be formed in the downward portion 30B. Although not shown, when the device drain outlet 43 is formed on the bottom surface of the fuel cell device 42 (bottom surface of the case 42B), the drain pipe 30 may include a downward portion that extends downward from the device drain outlet 43, in which case the horizontal portion can be omitted.

[0057] In this embodiment, "downward" may refer to a downward direction parallel to the vertical direction or a downward direction inclined relative to the vertical direction (diagonally downward). That is, the downward portion 30B of the drain pipe 30 may include at least one of a portion extending downward parallel to the vertical direction and a portion extending diagonally downward. The downward portion 30B may also include at least one of a portion extending downward in a straight line and a portion extending downward in a curved manner. In the specific example shown in FIGS. 4 and 5, the downward portion 30B includes a portion extending diagonally downward from the horizontal portion 30A and a portion extending downward from the portion extending diagonally downward parallel to the vertical direction, but the shape of the drain pipe 30 is not limited to the specific example shown in FIGS. 4 and 5.

[0058] The outlet 32 ​​is formed at the bottom of the drain pipe 30. In this case, the water in the drain pipe 30 flows toward the bottom of the drain pipe 30 and is smoothly discharged from the outlet 32 ​​formed at the bottom.

[0059] The drain pipe 30 extends toward the opening 24 formed in the machine body frame 20 (specifically, the frame main body 21), and the discharge port 32 is disposed at the opening 24 or below the opening 24. That is, the discharge port 32 is disposed at the underside of the machine body frame 20 (upper rotating body 2) or below the underside. In this case, water in the drain pipe 30 can be discharged below the upper rotating body 2 from the discharge port 32 disposed at the opening 24 or the discharge port 32 disposed below the opening 24. As a result, the water discharged from the discharge port 32 is guided by gravity, and the water is prevented from accumulating in the upper rotating body 2. In addition, the thermal influence of the water and steam discharged from the discharge port 32 on the upper rotating body 2 is prevented.

[0060] The frame main body 21 of the vehicle frame 20 is located below the fuel cell device 42. The fuel cell device 42 is placed on the frame main body 21 of the vehicle frame 20, and is thereby supported by the vehicle frame 20. In the specific example shown in FIGS. 3 to 5, the vehicle frame 20 has an device support member 25 fixed onto the frame main body 21, and the fuel cell device 42 is supported by this device support member 25. The device support member 25 may include a plurality of legs (for example, four legs) and a top plate supported by the plurality of legs, and in this case, the fuel cell device 42 may be placed on the top plate. Each of the plurality of legs may include a mount for suppressing transmission of vibration to the fuel cell device 42.

[0061] Next, the treatment of wastewater discharged from the outlet 32 ​​of the drain pipe 30 will be described. If water is freely discharged from the outlet 32, it will adhere to metal parts of the undercarriage 1 located below the outlet 32. In this case, rust may form at the parts of the undercarriage 1 to which the water adheres. Furthermore, depending on the work site, there may be locations where drainage is undesirable, resulting in undesirable wastewater. To prevent these problems, in this embodiment, the undercarriage 1 is provided with a tank 80 that stores the water (wastewater) discharged from the outlet 32 ​​of the drain pipe 30. This allows the water generated by the fuel cell device 42 to be stored in the tank 80 located away from the fuel cell device 42, preventing water from accumulating in the fuel cell device 42 and preventing rust on the undercarriage 1 and wastewater discharge in undesirable locations. Furthermore, since the drained water is stored in the tank 80, the impact of heat from the water and steam discharged from the outlet 32 ​​on the surroundings of the construction machine 10 is suppressed. The tank 80 is an example of a storage unit in the present disclosure.

[0062] 6 is a cross-sectional view of the construction machine 10 cut along a plane passing through the rotation axis Z, and is a schematic diagram showing the structure for guiding water (including water vapor) discharged from the device drain outlet 43 of the fuel cell device 42 to the tank 80. Note that because FIG. 6 is a schematic diagram for explaining the structure for guiding water produced in the fuel cell device 42 to the tank 80, the scale and shape do not necessarily match those of FIGS. 1 to 5.

[0063] As shown in FIG. 6, a tank 80 is disposed on a lower traveling body 1. The lower traveling body 1 includes a pair of left and right crawlers 84L, 84R and a car body 82 connecting the pair of left and right crawlers 84L, 84R. The crawler 84L includes a crawler frame 85L extending in one direction, two wheels 86L (see FIG. 1) and 87L (see FIG. 1) rotatably supported on one end and the other end of the crawler frame 85L, respectively, and an annular (endless) crawler belt 89L supported on these two wheels 86L, ​​87L. The output shaft of a left traveling motor (not shown) is connected to the wheel 86L or the wheel 87L via, for example, a not shown reducer so as to rotate the wheel 86L or the wheel 87L in a forward rotation direction and a reverse rotation direction. The crawler 84R includes a crawler frame 85R extending in one direction, two wheels 86R (see FIG. 1) and 87R (see FIG. 1) rotatably supported on one end and the other end of the crawler frame 85R, and an annular (endless) crawler belt 89R supported on these two wheels 86R and 87R. Each of the crawler belts 89R and 89R has a number of crawler shoes 91 connected to each other. The output shaft of a right traveling motor (not shown) is connected to the wheel 86R or the wheel 87R, for example, via a speed reducer (not shown), so that the wheel 86R or the wheel 87R can be rotated in a forward rotation direction and a reverse rotation direction.

[0064] The car body 82 includes an upper body 82a and a lower body 82b disposed below the upper body 82a. The upper body 82a and the lower body 82b are connected to a crawler frame 85L of the crawler 84L and a crawler frame 85R of the crawler 84R, respectively.

[0065] A space S is formed between the upper body 82a and the lower body 82b, and the tank 80 is disposed in this space S. That is, the tank 80 is disposed inside the car body 82. By disposing the tank 80 inside the car body 82, the tank 80 is protected by the car body 82. Furthermore, the tank 80 is disposed compactly inside the undercarriage 1.

[0066] The tank 80 may be formed in a cylindrical shape with an opening 81 at the top of the tank 80. In this case, the tank 80 includes a disk-shaped disk portion 80a and a cylindrical portion 80b extending upward from the outer edge of the disk portion 80a. The opening 81 functions as an opening through which wastewater is poured. When the tank 80 is viewed vertically from above, the opening 81 corresponds to a circular area surrounded by the cylindrical portion 80b. Wastewater is poured into the tank 80 through this opening 81. The tank 80 may be disposed with the disk portion 80a in direct contact with the lower body 82b, or may be supported by a support base disposed on the lower body 82b. It is also preferable that the tank 80 be disposed so that the center of the disk portion 80a coincides or substantially coincides with the pivot axis Z. The opening 81 is an example of an opening in the present disclosure.

[0067] A circular opening 82c is formed in the upper body 82a and is centered on the pivot axis Z. The cylindrical portion 80b of the tank 80 passes through the opening 82c, and its upper end extends above the opening 82c. The cylindrical portion 80b fits snugly into the opening 82c, limiting the movement of the tank 80 relative to the upper body 82a. The upper end of the tank 80 may be located at the same height as the opening 82c or below the opening 82c.

[0068] A cylindrical swivel joint 88 is disposed above the tank 80. The swivel joint 88 is disposed about the rotation axis Z and passes through the machine frame 20. The swivel joint 88 is a coupling that enables the transfer of hydraulic oil between the lower traveling body 1 and the upper rotating body 2.

[0069] A slewing bearing 90 that functions as a slewing ring of the upper slewing body 2 is disposed directly below the machine body frame 20. The slewing bearing 90 is disposed radially outward of the swivel joint 88 with the slewing axis Z as the center. The slewing bearing 90 is an example of a slewing ring of the present disclosure.

[0070] The slewing bearing 90 connects the upper rotating body 2 to the lower running body 1 so that the upper rotating body 2 can rotate relative to the lower running body 1. The slewing bearing 90 includes an annular inner ring 90a arranged on the lower running body 1, an annular outer ring 90b arranged on the upper rotating body 2, and a plurality of balls 90c interposed between the inner ring 90a and the outer ring 90b. The outer ring 90b is arranged on the outer peripheral side of the inner ring 90a and is fitted onto the inner ring 90a via the plurality of balls 90c so as to be rotatable relative to the inner ring 90a.

[0071] Internal teeth 94 are formed on the inner peripheral surface of the inner ring 90a. The internal teeth 94 mesh with a pinion gear 97 driven by a swing motor 95. The swing motor 95 is disposed on the upper swing body 2 side. A reducer may be interposed between the swing motor 95 and the pinion gear 97.

[0072] The outer wheel 90b is fixed to the machine frame 20 with a plurality of bolts 96 and is rotatable about the rotation axis Z together with the machine frame 20, i.e., the upper rotating body 2. When the pinion gear 97 rotates, the rotation motor 95 revolves around the rotation axis Z. At this time, the outer wheel 90b and the upper rotating body 2 are rotated about the rotation axis Z together with the rotation motor 95.

[0073] A grease bath portion 92 is provided on the inner peripheral side of the swivel bearing 90. The grease bath portion 92 is disposed in the lower running body 1. The grease bath portion 92 is disposed between the swivel joint 88 and the swivel bearing 90 in the radial direction centered on the swivel axis Z.

[0074] The grease bath portion 92 includes an annular outer cylindrical portion 92a extending upward from the upper body 82a, an intermediate member 92b extending horizontally from the upper end of the outer cylindrical portion 92a, and an inner cylindrical portion 92c extending upward from the inner circumferential end of the intermediate member 92b.

[0075] The upper end of the outer cylindrical portion 92a is located higher than the upper end of the tank 80. The intermediate member 92b is formed in a disk shape. The outer peripheral side of the intermediate member 92b supports the inner ring 90a of the slewing bearing 90. The inner peripheral side of the intermediate member 92b extends further inward than the cylindrical portion 80b of the tank 80. The upper end of the inner cylindrical portion 92c extends to the vicinity of the underside of the vehicle frame 20. This forms an annular space between the inner cylindrical portion 92c and the inner ring 90a. Grease is filled in this annular space, and the meshing portion between the pinion gear 97 and the internal teeth 94 is lubricated by the grease. Note that, although the inner cylindrical portion 92c is located more inward than the cylindrical portion 80b of the tank 80 in FIG. 6, the inner cylindrical portion 92c may be located vertically above the cylindrical portion 80b, or may be located more outward than the cylindrical portion 80b.

[0076] Furthermore, the opening 81 of the tank 80 is positioned so that the water (wastewater) discharged from the discharge port 32 can be easily collected by the opening 81 of the tank 80. Specifically, the opening 81 of the tank 80 is positioned vertically below the discharge port 32. In other words, when a virtual circle is imagined with its center at the pivot axis Z and with a radius R2 equal to the distance between the pivot axis Z and the inner circumferential surface of the cylindrical portion 80b of the tank 80, the radius R2 is set to be equal to or greater than the radius R1 of a virtual circle with its center at the pivot axis Z and with a radius R1 equal to the distance between the pivot axis Z and the discharge port 32 (R2≧R1). As a result, the opening 81 is positioned vertically below the discharge port 32, so that the water dropping from the discharge port 32 can be poured into the opening 81 and collected in the tank 80.

[0077] 7 is a schematic diagram showing the positional relationship between the tank 80, swivel joint 88, swivel bearing 90, and grease bath portion 92, as viewed from the direction along the swivel axis Z. Note that, because FIG. 7 is a schematic diagram, the scale and the like do not necessarily match those of FIG. 6.

[0078] 7, radius R2, which is the distance between the swivel axis Z and the inner peripheral surface of the cylindrical portion 80b of the tank 80, is set to be equal to or greater than radius R1, which is the distance between the swivel axis Z and the discharge port 32. When a virtual circle CR (see FIG. 7) is imagined, the center of which is the swivel axis Z and the distance between the center of the swivel bearing 90, which is a swivel ring (rotation axis) when the upper swivel body 2 swivels relative to the lower running body 1, i.e., the swivel axis Z, and the discharge port 32 is set to radius R1, the opening 81 of the tank 80 is positioned vertically below the circle CR. Note that the opening 81 is an area surrounded by the inner peripheral surface of the cylindrical portion 80b in FIG. 7.

[0079] Furthermore, when viewed from above, opening 81 is positioned so as to be located vertically below an area SA that extends from a position between an imaginary circle CR of radius R1 and the pivot axis Z (center of rotation) to a position outside the circle CR. In other words, when viewed from above, opening 81 is positioned so as to be located vertically below an area SA that extends from a position close to the pivot axis Z on the inside of the imaginary circle CR of radius R1 to a position away from the circle CR on the outside of the circle CR. Here, area SA is the shaded area in Fig. 7, and is an area surrounded by a circle CR1 that is centered on the pivot axis Z and has a radius equal to the distance between the pivot axis Z and a point of discharge port 32 shown in Fig. 7 that is closest to the pivot axis Z, and a circle CR2 that is centered on the pivot axis Z and has a radius equal to the distance between the pivot axis Z and a point of discharge port 32 that is farthest from the pivot axis Z. As a result, when the opening 81 is viewed from above, the opening 81 is positioned from the inside to the outside of the circle CR, and is positioned vertically below the area SA where water falls from the outlet 32, making it easier to collect the water falling from the outlet 32.

[0080] Further, the discharge port 32 is preferably provided at a position closer to the turning axis Z (turning center) than the turning bearing 90 which is a turning ring when viewed from above the discharge port 32, that is, at a position between the turning axis Z and the turning bearing 90. Thereby, since the discharge port 32 is arranged at a position surrounded by the turning bearing 90, it becomes difficult for dust and the like to enter the tank 80. Further, the influence of the heat of the drained water and water vapor discharged from the discharge port 32 is less likely to reach the periphery of the construction machine 10.

[0081] Further, the discharge port 32 may be arranged radially inside with respect to the turning axis Z than the grease bath portion 92. That is, the radius R1 between the turning axis Z and the discharge port 32 may be smaller than the radius R3 of a circle centered on the turning axis Z and having the distance between the turning axis Z and the inner cylindrical portion 92c of the grease bath portion 92 as the radius R3 (R1 < R3). In this case, it is possible to avoid the water discharged from the discharge port 32 from entering the annular space formed by the grease bath portion 92.

[0082] Further, a vent hole 98 may be formed in the car body 82 to communicate the space S formed inside the car body 82 with the outside. The vent hole 98 may be formed, for example, in the upper body 82a or in the lower body 82b. By forming the vent hole 98, the vapor discharged from the discharge port 32 is discharged to the outside through the vent hole 98. Note that if the vapor can be discharged to the outside from a gap or the like even without forming the vent hole 98, the vent hole 98 may not be formed.

[0083] Further, the tank 80 preferably includes an openable and closable drain plug for discharging the drained water stored in the tank 80 to the outside of the tank 80. From the viewpoint of workability, it is more preferable that this drain plug is a drain cock 102 that is opened and closed manually or electrically. In this case, the drain cock 102 is arranged in the drain pipe 100 connected to the tank 80. Note that the drain cock 102 is an example of the drain plug of the present disclosure.

[0084] The drain pipe 100 is connected to, for example, the disk portion 80a of the tank 80, passes through a through-hole 104 formed in the lower body 82b of the lower traveling body 1, and extends to a position below the lower body 82b. The drain pipe 100 may also be connected to the cylindrical portion 80b. In this case, the drain pipe 100 is preferably connected below the center position in the height direction of the cylindrical portion 80b, and more preferably connected near the disk portion 80a.

[0085] The drain cock 102 is disposed, for example, near the outlet of the drain pipe 100. The drain cock 102 may be a manual type that is opened and closed manually by an operator, or may be an electric type that is operated by turning on and off a selector switch disposed in the cab 11, for example. By providing the drain cock 102, the wastewater stored in the tank 80 can be discharged at an appropriate time. For example, at a work site where drainage is not desirable, closing the drain cock 102 can prevent unintended drainage from the tank 80. Also, a sensor that measures the amount of water stored in the tank 80 may be disposed, and when the amount of water stored in the tank 80 reaches or exceeds a predetermined amount, the sensor may notify the operator to drain the water from the tank 80.

[0086] [Second embodiment] Next, a second embodiment relating to the treatment of wastewater discharged from the outlet 32 ​​of the drain pipe 30 will be described. Fig. 8 is a cross-sectional view of the construction machine 10 cut along a plane passing through the rotation axis Z, and is a schematic diagram showing a structure for guiding wastewater discharged from the device outlet 43 of the fuel cell device 42 to the tank 110. Note that Fig. 8 is a schematic diagram for explaining a structure for guiding water produced in the fuel cell device 42 to the tank 110, and therefore does not necessarily match the scale and shape of Figs. 1 to 5, etc.

[0087] In this embodiment as well, water generated in the fuel cell device 42 is discharged via the drain pipe 30 from the outlet 32 ​​located on the lower surface of the upper rotating body 2 or below the lower surface. Furthermore, in this embodiment, when viewed from above, the outlet 32 ​​is located at a position farther from the rotating axis Z (center of rotation) than the rotating bearing 90, which is a rotating ring, i.e., at a position outside the rotating bearing 90. For example, if it is difficult to locate the outlet 32 ​​closer to the rotating axis Z than the rotating bearing 90 due to strength issues, space limitations, or the like, the outlet 32 ​​can also be located at a position farther from the rotating axis Z than the rotating bearing 90, as shown in FIG. 8.

[0088] As shown in Fig. 8, a tank 110 is disposed on the undercarriage 1. A car body 82, which is part of the undercarriage 1, includes an upper body 82a and a lower body 82b disposed below the upper body 82a. The upper body 82a and the lower body 82b are connected to a pair of left and right crawlers 84L, 84R, respectively. A space S is formed between the upper body 82a and the lower body 82b, and the tank 110 is disposed in this space S. As a result, the tank 110 is disposed within the car body 82 and is protected by the car body 82.

[0089] The tank 110 may be formed, for example, in a cylindrical shape or a rectangular parallelepiped shape. The tank 110 includes a lower plate portion 110a disposed on the lower body 82b, a side wall portion 110b extending upward from the edge of the lower plate portion 110a, and an upper plate portion 110c closing the upper end of the side wall portion 110b. The tank 110 may be disposed with the lower plate portion 110a in direct contact with the lower body 82b, or may be supported by a support base disposed on the lower body 82b. The tank 110 is an example of a storage portion of the present disclosure.

[0090] Tank 110 is preferably provided with an openable drain plug for discharging wastewater stored in tank 110 to the outside of tank 110. From the viewpoint of operability, this drain plug is preferably a drain cock 114. In this case, drain cock 114 is disposed in drain pipe 112 connected to tank 110. Drain cock 114 is an example of a drain plug of the present disclosure.

[0091] The drain pipe 112 is connected to, for example, the lower plate portion 110a of the tank 110, passes through a through-hole 116 formed in the lower body 82b of the lower traveling body 1, and extends to a position below the lower body 82b. The drain pipe 112 may also be connected to the side wall portion 110b. In this case, the drain pipe 112 is preferably connected below the center position in the height direction of the side wall portion 110b, and more preferably connected near the lower plate portion 110a.

[0092] The drain cock 114 is disposed, for example, near the outlet of the drain pipe 112. The drain cock 114 may be a manual type that is opened and closed manually by an operator, or may be an electric type that is operated by turning on and off a selector switch disposed in the cab 11, for example. By providing the drain cock 114, the water stored in the tank 110 can be discharged at an appropriate time.

[0093] The lower running body 1 includes an annular receiving portion 118 disposed above the tank 110, and a water guide mechanism 119 that guides water stored in the annular receiving portion 118 to the tank 110. The annular receiving portion 118 is an example of a second storage portion of the present disclosure.

[0094] The annular receiving portion 118 is formed on the upper part of the upper body 82a and outside the car body 82. The annular receiving portion 118 is formed annularly around the turning axis Z so as to receive the water discharged from the discharge port 32 of the drain pipe 30. The annular receiving portion 118 includes a bottom plate portion 118a formed in a disc shape, an outer cylindrical portion 118b extending upward from the outer edge of the bottom plate portion 118a, and an inner cylindrical portion 118c extending upward from the inner edge of the bottom plate portion 118a. The cylindrical portion 118b may extend vertically upward or may extend upward while being inclined with respect to the vertical direction. Further, the annular receiving portion 118 may be integrally formed with a member (a part of the grease bath portion 92) that is disposed on the lower traveling body 1 and supports the slewing bearing 90, or may be disposed as a separate member from the member.

[0095] FIG. 9 is a diagram schematically showing the arrangement positions of the drain pipe 30, the fuel cell device 42, the annular receiving portion 118, and the tank 110, and is a view seen from vertically above. An opening 120 is formed in the upper part of the annular receiving portion 118 as an opening that opens upward. The opening 120 is formed annularly surrounded between the inner peripheral surface of the outer cylindrical portion 118b and the outer peripheral surface of the inner cylindrical portion 118c, and is formed so as to be located vertically below the discharge port 32. Specifically, when a virtual circle CR centered on the turning axis Z and having a radius R1 equal to the distance between the turning axis Z and the discharge port 32 is assumed, the opening 120 is arranged so as to be located vertically below the circle CR. In other words, the radius R1, which is the distance between the turning axis Z and the discharge port 32, is made smaller than the radius R2 of a virtual circle centered on the turning axis Z and having a radius R2 equal to the distance between the turning axis Z and the inner peripheral surface of the outer cylindrical portion 118b of the annular receiving portion 118 (R1 < R2). Further, the radius R1 is made larger than the radius R3 of a virtual circle centered on the turning axis Z and having a radius R3 equal to the distance between the turning axis Z and the outer peripheral surface of the inner cylindrical portion 118c (R1 > R3). Thereby, the water falling from the discharge port 32 of the drain pipe 30 can be poured into the opening 120 and received by the annular receiving portion 118.

[0096] More preferably, the opening 120 is disposed so as to be located vertically below an area SA surrounded by a circle CR1 whose center is the pivot axis Z and whose radius is the distance between the pivot axis Z and the point of the outlet 32 ​​that is closest to the pivot axis Z, and a circle CR2 whose center is the pivot axis Z and whose radius is the distance between the pivot axis Z and the point of the outlet 32 ​​that is farthest from the pivot axis Z. In other words, the opening 120 is formed so as to include the area SA. This allows the annular receiving portion 118 to properly collect water dropping from the outlet 32.

[0097] The water conveying mechanism 119 is a mechanism that guides the water received and stored in the annular receiving portion 118 into the tank 110. The water conveying mechanism 119 is provided with a connecting hose 122 that connects the annular receiving portion 118 and the tank 110. The connecting hose 122 is made of, for example, polyvinyl chloride, a resin hose, silicone, or the like.

[0098] One end of the communication hose 122 communicates with the annular receiving portion 118, and the other end communicates with the inside of the tank 110. The communication hose 122 passes through a through hole 124 formed in the upper body 82a and a through hole 126 formed in the top plate portion 110c of the tank 110, connecting the annular receiving portion 118 and the tank 110. As a result, water stored in the annular receiving portion 118 is stored in the tank 110 via the communication hose 122. Note that the communication hose 122 may also pass through a side wall portion 110b of the tank 110 to communicate with the inside of the tank 110.

[0099] In the second embodiment, the tank 110 has an upper portion covered with an upper plate portion 110c, which prevents the wastewater stored in the tank 110 from spilling. Furthermore, the wastewater stored in the annular receiving portion 118 is stored in the tank 110 via the connecting hose 122, which increases the degree of freedom in the shape of the tank 110 and allows the shape of the tank 110 to be changed appropriately depending on the shape of the space S of the lower traveling body 1. Furthermore, the degree of freedom in the arrangement position of the tank 110 also increases.

[0100] [Variations] In the above embodiment, water discharged from the device drain outlet 43 of the fuel cell device 42 passes through the drain pipe 30 and is discharged from the underside of the upper rotating body 2 or from the outlet 32 ​​located below the underside, but the present disclosure is not limited to this. That is, the drain pipe 30 may be omitted. For example, a through-hole that functions as a drain outlet may be formed in the machine frame 20, and the water discharged from the fuel cell device 42 may be configured to fall directly downward through the through-hole.

[0101] In the above embodiment, the tank 80 is disposed as a separate member in the car body 82, but the tank 80 may be integrally molded with the car body 82. In this case, an opening (opening) into which the wastewater discharged from the discharge port 32 can be poured is integrally formed in the lower traveling body 1.

[0102] In the above embodiment, the drain cock 102 for draining water stored in the tank 80 is provided, but the present disclosure is not limited to this as long as the structure is capable of draining water stored in the tank 80. For example, the tank 80 may be provided with a removable plug, and the water stored in the tank 80 may be drained by removing the plug. Similarly, the drain cock 114 provided in the tank 110 may also be modified as appropriate as long as it is capable of draining water.

[0103] In the above embodiment, the tank 80 is formed in a cylindrical shape, but is not limited to a cylindrical shape as long as the opening is positioned vertically below the discharge port 32. For example, the tank may be formed in a rectangular parallelepiped shape, with the opening formed in a rectangular shape. From the viewpoint of forming the tank compactly, a cylindrical shape is most preferable.

[0104] In the above embodiment, the water stored in the annular receiving portion 118 is transferred to the tank 110 via the connecting hose 122 serving as the water guide mechanism 119. However, the connecting hose 122 is not necessarily required. For example, a through-hole may be formed penetrating the bottom plate portion 118a and the upper body 82a of the annular receiving portion 118, with the tank 110 positioned directly vertically below the through-hole. This allows the water stored in the annular receiving portion 118 to fall through the through-hole and be received by the tank positioned vertically below. In this case, an opening or through-hole is formed above the tank. When configured as described above, the through-hole penetrating the bottom plate portion 118a and the upper body 82a and the through-hole or opening formed in the tank 110 serve as a water guide mechanism for guiding the water stored in the annular receiving portion 118 to the tank 110.

[0105] In the above embodiment, the tank 110 is disposed inside the car body 82, but the present disclosure is not limited to this. For example, the tank 110 may be attached to the outside of the car body 82. In this case, by forming a through hole in the bottom plate portion 118a of the annular receiving portion 118 and disposing the tank vertically below the through hole, water dropping through the through hole can be received by the tank. As a result, a hose connecting the annular receiving portion 118 and the tank can be omitted.

[0106] In the first embodiment described above, the discharge port 32 is disposed at a position closer to the pivot axis Z than the pivot bearing 90, which is a pivot ring; however, the present disclosure is not limited to this. That is, the discharge port 32 may be disposed at a position farther from the pivot axis Z than the pivot bearing 90. For example, if it is difficult to dispose the discharge port 32 at a position closer to the pivot axis Z than the pivot bearing 90 due to strength issues, space limitations, or the like, the discharge port 32 may be disposed at a position farther from the pivot axis Z than the pivot bearing 90.

[0107] In the second embodiment described above, the discharge port 32 is disposed at a position farther from the swivel axis Z than the swivel bearing 90, which is a swivel ring, but the present disclosure is not limited to this. That is, the discharge port 32 may be disposed at a position closer to the swivel axis Z than the swivel bearing 90. In this case, by forming the annular receiving portion 118 on the inner circumferential side of the swivel bearing 90, it becomes difficult for dirt and dust to enter the annular receiving portion 118. [Explanation of symbols]

[0108] 1: Lower running body 2: Upper rotating body 10: Construction machinery 32: Outlet 42: Fuel cell 80: Tank (storage section) 81: Opening (opening) 82: Car Body 84: Crawler 90: Swivel bearing (swivel ring) 90a: Inner circle 90b: outer ring 94: Inner teeth 102: Drain cock (drain plug) 110: Tank (storage section) 114: Drain cock (drain plug) 118: Annular receiving portion (second storage portion) 119: Water conduction mechanism 120: Opening (opening)

Claims

1. a lower running body; an upper rotating body rotatably supported relative to the lower traveling body; a fuel cell device mounted on the upper rotating body; an outlet for discharging water generated in the fuel cell device as wastewater; a storage section that stores the wastewater discharged from the discharge port, The discharge port is disposed on the lower surface of the upper rotating body or below the lower surface, The storage section is disposed in the lower traveling body of the construction machine.

2. the undercarriage has an opening through which liquid can be poured; The construction machine according to claim 1 , wherein the storage section stores the wastewater poured into the opening as the liquid.

3. The construction machine according to claim 2 , wherein the opening is formed in an upper portion of the storage section.

4. 3. The construction machine according to claim 2, wherein the lower running body comprises: a second storage section disposed above the storage section and configured to receive the wastewater poured into the opening; and a water conveying mechanism configured to guide the wastewater received in the second storage section to the storage section.

5. The construction machine according to claim 2 , wherein the opening is positioned vertically below the discharge port.

6. 6. The construction machine according to claim 5, wherein the opening is positioned vertically below a virtual circle having a radius equal to the distance between the discharge outlet and the center of rotation of a slewing ring connecting the upper rotating body to the lower running body, so that the upper rotating body can rotate relative to the lower running body.

7. 7. The construction machine according to claim 6, wherein the opening is arranged so as to be located vertically below an area extending from between the circle and the center of rotation to a position outside the circle when viewed from above.

8. a slewing ring that connects the upper rotating body to the lower traveling body so that the upper rotating body can rotate relative to the lower traveling body; 8. The construction machine according to claim 1, wherein the discharge outlet is disposed at a position between the center of rotation of the slewing ring and the slewing ring when viewed from above.

9. a slewing ring that connects the upper rotating body to the lower traveling body so that the upper rotating body can rotate relative to the lower traveling body; The construction machine according to any one of claims 1 to 7, wherein the discharge port is disposed at a position outside the slewing ring when viewed from above.

10. 8. The construction machine according to claim 1, wherein the storage section is provided with an openable / closable drain plug for discharging the drainage water stored in the storage section to the outside of the storage section.

11. the lower traveling body includes a pair of left and right crawlers and a car body connecting the pair of left and right crawlers, The construction machine according to any one of claims 1 to 7, wherein the storage section is disposed within the car body.

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