Work machine

Abstract

To provide a working machine equipped with a hydrogen tank.SOLUTION: A work machine 1 according to the present invention includes a lower travelling body 10, an upper slewing body 20 slewably provided to the lower travelling body 10, a work mechanism 30 provided to the upper slewing body 20, a power source 41 provided to the upper slewing body 20 and using hydrogen as fuel, and a hydrogen supply system HSS having a hydrogen tank 50 provided to the work mechanism 30. For example, the hydrogen supply system HSS includes a pressure reducing valve 52 connected to the hydrogen tank 50, and a pressure-reduced hydrogen supply line extending from the pressure reducing valve 52 toward the upper slewing body 20.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a work machine. [Background technology]

[0002] BACKGROUND ART A work machine is known in which at least a part of an energy storage system including a fuel cell is installed as part of a counterweight (see Patent Document 1).

[0003] Specifically, an energy storage system including a fuel cell is provided at a counterweight provided on the upper rotating body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-9589 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, when the fuel cell is a hydrogen fuel cell, it is necessary to provide the work machine with a hydrogen tank for storing hydrogen, which is the energy source.

[0006] The present invention has been made in view of the above circumstances, and has an object to provide a work machine equipped with a hydrogen tank. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention is realized by the following configuration. The work machine of the present invention comprises: a lower running body; an upper rotating body that is rotatably provided with respect to the lower traveling body; a working mechanism provided on the upper rotating body; a hydrogen-fueled power source provided on the upper rotating body; and a hydrogen supply system having a hydrogen tank provided in the working mechanism. [Effects of the Invention]

[0008] According to the present invention, a work machine equipped with a hydrogen tank is provided. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a side view of a working machine 1 with a cover provided in a hydrogen supply system of a first embodiment according to the present invention removed. [Figure 2] 1 is a side view of a working machine 1 with a cover attached that is provided in a hydrogen supply system according to a first embodiment of the present invention. [Figure 3] FIG. 1 is a rear view of a work machine according to a first embodiment of the present invention. [Figure 4] 1 is a block diagram for explaining a drive system of a work machine according to a first embodiment of the present invention. [Figure 5] FIG. 4 is a diagram for explaining a work machine according to a second embodiment of the present invention. [Figure 6] FIG. 10 is a side view of a work machine 1 according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter also referred to as embodiments) will be described in detail with reference to the accompanying drawings. It should be noted that the same elements are denoted by the same numbers or symbols throughout the description of the embodiments.

[0011] However, please note that in consideration of the ease of viewing the drawings, not all of the same elements are numbered or marked, and some elements are not numbered or marked.

[0012] <<First Embodiment>> A working machine 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. In the first embodiment, the work machine 1 is shown as a crawler-type shovel, but the work machine 1 does not have to be limited to a shovel and may be other heavy machinery (for example, a demolition machine, a loading machine, an agricultural machine, etc.).

[0013] FIG. 1 is a side view of a working machine 1 with covers CV1 and CV2 provided in a hydrogen supply system HSS according to a first embodiment of the present invention removed. Note that Figure 1 is a right side view of the side of the upper rotating body 20 that is the right side of the work machine 1 when looking at the upper rotating body 20 from the rear, with the side where the operator's cab 21 is located being the front and the opposite side being the rear.

[0014] In the following description of the upper rotating body 20, the side where the operator's cab 21 is located will be referred to as the front, and the opposite side will be referred to as the rear. When looking at the upper rotating body 20 from the rear, the left side will be referred to as the left, and the right side will be referred to as the right.

[0015] It should be noted that since the upper rotating body 20 rotates relative to the lower traveling body 10, the definition of the direction of the upper rotating body 20 and the definition of the direction of the lower traveling body 10 may not coincide with each other.

[0016] Therefore, in the following description of the lower running structure 10, directions will be explained based on the running direction during normal running operation.

[0017] Specifically, the forward direction during normal running operation of the lower running body 10 will be referred to as the forward direction (forward direction forward, forward side, etc.), and conversely, the backward direction will be referred to as the backward direction (backward direction forward, backward side of the forward direction, etc.).

[0018] FIG. 2 is a side view of the working machine 1 with the covers CV1 and CV2 provided in the hydrogen supply system HSS of the first embodiment according to the present invention attached, and corresponds to FIG.

[0019] FIG. 3 is a rear view of the work machine 1 of the first embodiment according to the present invention, as seen from the left side of FIG. In FIG. 3, the working mechanism 30 is not shown.

[0020] FIG. 4 is a block diagram for explaining a drive system 40 of the work machine 1 of the first embodiment according to the present invention. Please note that Figure 4 is an illustration for making the hydraulic flow easier to understand, and does not necessarily correspond to the actual arrangement.

[0021] As shown in Figures 1 to 3, the work machine 1 comprises a lower running body 10, an upper rotating body 20 that is rotatably mounted relative to the lower running body 10, and a work mechanism 30 that is mounted on the upper rotating body 20 so as to be capable of raising and lowering, and has an attachment 33 at its tip.

[0022] As will be explained later, the work machine 1 also includes a hydrogen-fueled power source 41 (see Figure 4) provided on the upper rotating body 20, and a hydrogen supply system HSS (see Figures 1 and 2) having a hydrogen tank 50 provided on the work mechanism 30.

[0023] [Undercarriage 10] In the first embodiment, the lower traveling body 10 is of a crawler type. As shown in FIG. 3, the lower traveling body 10 includes a frame 11 and a traveling mechanism 12 (the mechanism itself is not shown) provided on the frame 11.

[0024] (Frame 11) The frame 11 includes a central frame 11A located in the center and a pair of spaced apart crawler frames 11B arranged in a direction (also referred to as a first direction) perpendicular to the traveling direction of the lower traveling body 10.

[0025] Specifically, the crawler frames 11B are integrally provided on both ends of the central frame 11A in the first direction.

[0026] (Traveling mechanism 12) Although not specifically shown, the traveling mechanism 12 is a mechanism for traveling provided on a general crawler-type lower traveling body 10.

[0027] For example, the traveling mechanism 12 includes a front idler provided on the front side of the crawler frame 11B in the forward direction, a sprocket provided on the rear side of the crawler frame 11B in the forward direction, an upper roller provided between the front idler and the sprocket on the upper side of the crawler frame 11B, a lower roller provided between the front idler and the sprocket on the lower side of the crawler frame 11B, and a rubber crawler provided to surround the front idler, sprocket, upper roller, and lower roller.

[0028] [Upper rotating body 20] As shown in FIGS. 1 to 3, the upper rotating body 20 includes an operator's cab 21 provided in front of the upper rotating body 20 and a machine room 22 provided in the rear of the operator's cab 21.

[0029] The operator's cab 21 is provided with an operation unit (not shown) for an operator to sit in and perform various operations.

[0030] The machine room 22 also includes a power source 41 (see Figure 4) described below, a hydraulic pump 42 (see Figure 4) described below, a hydraulic oil tank 42A (see Figure 4) described below, a control valve 43 described below, and a swing motor 44A described below.

[0031] [Working mechanism 30] The working mechanism 30 comprises a boom 31 whose base end is capable of being raised and lowered relative to the upper rotating body 20, an arm 32 whose base end is rotatably mounted relative to the tip of the boom 31, and an attachment 33 (in this example, a bucket) whose base end is rotatably mounted to the tip of the arm 32.

[0032] The working mechanism 30 also includes a boom cylinder 31A for raising and lowering the boom 31 relative to the upper rotating body 20, an arm cylinder 32A for rotating the arm 32 relative to the boom 31, and an attachment cylinder 33A for rotating the attachment 33 relative to the arm 32.

[0033] The boom cylinder 31A, the arm cylinder 32A, and the attachment cylinder 33A are all hydraulic cylinders.

[0034] [Drivetrain 40] As shown in FIG. 4, the drive system 40 includes a power source 41, a working pump 42, a control valve 43, and a drive unit 44.

[0035] (Power source 41) The power source 41 is provided in the machine room 22 of the upper rotating body 20 and is a mechanism that generates power for driving the operating pump 42.

[0036] In the first embodiment, the power source 41 includes a hydrogen fuel cell 41A that generates electricity by reacting hydrogen supplied as fuel from a hydrogen tank 50 with oxygen in the air, and an electric motor 41B that is driven by the electricity generated by the hydrogen fuel cell 41A. The power source 41 may further include a secondary cell (a so-called battery) or the like.

[0037] The rotary shaft of the electric motor 41B is connected to the rotary shaft of the working pump 42, and the working pump 42 is driven by the driving of the electric motor 41B.

[0038] The electric motor 41B is, for example, a three-phase motor, and is integrally provided with an inverter that performs current control for rotation control.

[0039] The inverter converts the direct current from the hydrogen fuel cell 41A into three-phase alternating current, which is supplied to the electric motor 41B, causing the electric motor 41B to rotate.

[0040] The power source 41 may be a hydrogen engine or the like that operates as an internal combustion engine that burns hydrogen supplied from a hydrogen tank 50 as fuel, instead of the configuration of the hydrogen fuel cell 41A and the electric motor 41B.

[0041] In this way, the power source 41 does not need to be limited to the configuration of the first embodiment, and may be any mechanism that generates power for driving the actuation pump 42 using hydrogen as fuel.

[0042] (Operating pump 42) The hydraulic pump 42 is provided in the machine room 22 of the upper rotating body 20 and is a hydraulic pump that sends hydraulic oil from a hydraulic oil tank 42A provided in the machine room 22 of the upper rotating body 20 to the control valve 43. In other words, the hydraulic pump 42 is a mechanism that generates hydraulic pressure that is controlled by the control valve 43 .

[0043] (Control valve 43) The control valve 43 is provided in the machine room 22 of the upper rotating body 20, and is a valve that controls the supply of hydraulic oil to the drive unit 44 and the return of hydraulic oil from the drive unit 44 in accordance with the operation (operation by the operator) of an operating unit (not shown) for performing various operations provided in the driver's cab 21.

[0044] (Driver 44) The drive unit 44 includes a swing motor 44A, which is a hydraulic motor provided on the upper swing body 20, a work mechanism cylinder 44B, which is a hydraulic cylinder provided on the work mechanism 30, and a travel motor 44C, which is a hydraulic motor provided on each of the pair of travel mechanisms 12.

[0045] The swing motor 44A, the working mechanism cylinder 44B, and the traveling motor 44C are driven in accordance with the state of the hydraulic pressure (working oil) controlled by the control valve 43.

[0046] The swing motor 44A is a motor for swinging the upper swing body 20 relative to the lower traveling body 10, and the working mechanism cylinder 44B is the boom cylinder 31A, arm cylinder 32A, and attachment cylinder 33A shown above. The travel motor 44C is a motor for driving the crawler for travel.

[0047] [Hydrogen supply system HSS] As shown in Figures 1 and 2, the hydrogen supply system HSS comprises a hydrogen tank 50 provided at the base end of the boom 31 of the work mechanism 30, a hydrogen filling port 51 to which hydrogen is supplied from the outside, a hydrogen supply line HL2 connecting the hydrogen tank 50 and the hydrogen filling port 51, a pressure reducing valve 52 that reduces the pressure of hydrogen supplied from the upstream side and transfers it to the downstream side, a hydrogen supply line HL3 connecting the pressure reducing valve 52 and the hydrogen supply line HL2, and a hydrogen supply line HL1 that extends from the pressure reducing valve 52 toward the upper rotating body 20 and supplies hydrogen to the power source 41.

[0048] As shown in FIG. 2, the hydrogen supply system HSS includes a cover CV1 that covers the hydrogen tank 50 (see FIG. 1) and the pressure reducing valve 52 (see FIG. 1), and a cover CV2 that covers the hydrogen filling port 51 (see FIG. 1).

[0049] (50 hydrogen tanks) The hydrogen tank 50 is a cylindrical tank for storing hydrogen to be supplied to the power source 41 .

[0050] The weight of the hydrogen tank 50 affects the work performance. Specifically, when the weight of the working mechanism 30 increases, the lifting performance of the attachment 33 (for example, the weight that can be lifted by the shovel) decreases (decreases).

[0051] Therefore, it is preferable to use a lightweight hydrogen tank made of carbon fiber reinforced plastic and glass fiber reinforced plastic as the hydrogen tank 50.

[0052] In addition, in the first embodiment, as shown in Figure 1, the hydrogen tank 50 is provided on the outer surface (also referred to as the outer side) of the boom 31, located on the opposite side of the operator's cab 21 provided on the upper rotating body 20, across the boom 31. The hydrogen tank 50 is positioned so as to be located laterally relative to the outer surface of the boom 31, and is attached, for example, to a jig (not shown) that protrudes laterally (opposite the driver's cab 21) relative to the outer surface of the boom 31.

[0053] The outer surface of the boom 31 located on the opposite side of the cab 21 is not within the field of view of the operator sitting in the cab 21. Therefore, the operator is not hindered from operating the work machine 1 (specifically, the work mechanism 30). In particular, the hydrogen tank 50 is arranged longitudinally in a direction from the base end of the boom 31 toward the middle part between the base end of the boom 31 and the tip end of the boom 31, so that the entire length of the hydrogen tank 50 is unlikely to be visible to the operator sitting in the cab 21.

[0054] Furthermore, the base end side of the boom 31 is closer to the upper rotating body 20, and the probability of the boom 31 colliding with an obstacle or the like when the working mechanism 30 is performing work is low. Therefore, by providing the hydrogen tank 50 on the base end side of the boom 31 as in the first embodiment, it is easy to prevent the hydrogen tank 50 from colliding with an obstacle and being damaged.

[0055] (Hydrogen filling port 51) The hydrogen filling port 51 is a receptacle that receives the nozzle of a hydrogen dispenser installed at a hydrogen filling station.

[0056] The hydrogen supplied from the hydrogen dispenser to the hydrogen filling port 51 is then filled into the hydrogen tank 50 through a hydrogen supply line HL2 that supplies the hydrogen supplied from the hydrogen filling port 51 to the hydrogen tank 50.

[0057] Therefore, the hydrogen flowing through the hydrogen supply line HL2 is high-pressure hydrogen having the same pressure as the hydrogen filling pressure of the hydrogen tank 50 (for example, about 70 MPa). As described above, high-pressure hydrogen flows through the hydrogen supply line HL2, and therefore the hydrogen supply line HL2 is also called a high-pressure hydrogen supply line.

[0058] High-pressure hydrogen supply lines are required to have high strength (high pressure resistance), and it is also necessary to consider that deformation and breakage will not occur when stress is applied.

[0059] Therefore, it is preferable to use, for example, stainless steel piping of 3 / 8 inch or more for the gas piping that forms the hydrogen supply line HL2, which is a high-pressure hydrogen supply line.

[0060] In addition, in the first embodiment, the hydrogen filling port 51 is provided at the tip of the boom 31, and as shown in Figure 1, when the working mechanism 30 is lowered, the tip of the boom 31 is at a height that can be accessed by an operator or the like from the ground. The state in which the working mechanism 30 is lowered is a state in which, as shown in Figure 1, the boom 31 is tilted downward so that the tip of the boom 31 approaches the ground, the arm 32 is rotated relative to the boom 31 so that the arm 32 is positioned below the boom 31, and the attachment 33 is rotated relative to the arm 32 so that the attachment 33 is positioned between the boom 31 positioned above and the arm 32 positioned below.

[0061] Therefore, in order to fill hydrogen into the hydrogen tank 50, the nozzle of the hydrogen dispenser can be inserted into the hydrogen filling port 51 from the ground.

[0062] (Reducing valve 52) The pressure reducing valve 52 is a regulator provided to reduce the pressure of hydrogen supplied from the hydrogen tank 50 upstream of the pressure reducing valve 52 via the hydrogen supply line HL3 to the pressure used in the hydrogen fuel cell 41A located downstream of the pressure reducing valve 52, and is provided on the base end side of the boom 31.

[0063] The hydrogen pressure is reduced by the pressure reducing valve 52 and is supplied to the power source 41 through the hydrogen supply line HL1.

[0064] The hydrogen supply line HL1 is also called a reduced pressure hydrogen supply line because hydrogen flows through the hydrogen supply line HL1 after being depressurized by the pressure reducing valve 52.

[0065] Furthermore, since high-pressure hydrogen does not flow through this reduced-pressure hydrogen supply line, the gas piping that forms the reduced-pressure hydrogen supply line does not need to have high pressure resistance.

[0066] Therefore, flexible gas piping that is pliable and can be bent freely (e.g., a hose compatible with hydrogen gas) can be used for the gas piping that forms the reduced pressure hydrogen supply line, making it easy to realize a configuration that can suitably follow the movement of the boom 31. Specifically, the reduced pressure hydrogen supply line located between the reduced pressure hydrogen supply line on the upper rotating body 20 side and the reduced pressure hydrogen supply line on the boom 31 side is configured to bend according to the angle of the boom 31 relative to the upper rotating body 20, which changes according to the raising and lowering operation of the boom 31.

[0067] On the other hand, high-pressure hydrogen having the same pressure as the hydrogen filling pressure of the hydrogen tank 50 (for example, about 70 MPa) flows through the hydrogen supply line HL3 that supplies hydrogen from the hydrogen tank 50 to the pressure reducing valve 52.

[0068] As described above, high-pressure hydrogen flows through the hydrogen supply line HL3, and therefore the hydrogen supply line HL3 is also called a high-pressure hydrogen supply line.

[0069] Therefore, similarly to the hydrogen supply line HL2, it is preferable to use, for example, stainless steel piping of 3 / 8 inch or more for the gas piping that forms the hydrogen supply line HL3, which is a high-pressure hydrogen supply line.

[0070] (Cover CV1) The cover CV1 is detachably provided on the working mechanism 30 (more specifically, the outer surface of the boom 31) so as to cover the hydrogen tank 50 and the pressure reducing valve 52.

[0071] In this way, by providing the cover CV1, it is possible to prevent mud, dust, and water such as rainwater from getting on the hydrogen tank 50 and the pressure reducing valve 52, and it is also possible to prevent the hydrogen tank 50 and the pressure reducing valve 52 from being exposed to direct sunlight.

[0072] (Cover CV2) The cover CV2 is detachably provided on the working mechanism 30 (more specifically, the outer surface of the boom 31) so as to cover the hydrogen filling port 51.

[0073] In this way, by providing the cover CV1, it is possible to prevent mud, dust, and water such as rainwater from getting on the hydrogen filling port 51, and also to avoid exposing the hydrogen filling port 51 to direct sunlight.

[0074] As described above, in the first embodiment, the work machine 1 is provided with the hydrogen tank 50 so as not to interfere with work performed by the work mechanism 30.

[0075] Furthermore, the upper rotating body 20 is equipped with many mechanisms that act as heat sources (for example, a hydrogen fuel cell 41A, an electric motor 41B, and an inverter that controls the drive of the electric motor 41B), but the working mechanism 30 (in this example, the boom 31) does not have any such heat sources.

[0076] Therefore, the hydrogen tank 50 provided on the working mechanism 30 (in this example, the boom 31) is not affected by heat, as would be the case if the hydrogen tank 50 were placed on the upper rotating body 20.

[0077] <<Second embodiment>> Next, a working machine 1 according to a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a diagram for explaining a work machine 1 according to a second embodiment of the present invention, and is a diagram mainly showing only the boom 31 of the work machine 1.

[0078] The basic configuration of the second embodiment is similar to that of the first embodiment, and the following mainly describes the differences from the first embodiment, and explanations of the similarities with the first embodiment may be omitted.

[0079] As can be seen from Figure 5, the boom 31 is curved so that the intermediate portion between the base end side (left side of the figure) and the tip end side (right side of the figure) is convex upward when viewed from the side, and is a box-shaped member with space inside over its entire length.

[0080] Therefore, the boom 31 has a space therein that can accommodate the hydrogen tank 50, the hydrogen filling port 51, the pressure reducing valve 52, and the like.

[0081] Therefore, although not visible in Figure 5, the hydrogen tank 50, hydrogen filling port 51, and pressure reducing valve 52 are housed inside the boom 31 in the same position as shown in Figure 1 when viewed from the side. That is, a hydrogen tank 50 is provided in the internal space on the base end side of the boom 31, a hydrogen filling port 51 is provided in the internal space on the tip end side of the boom 31, and a pressure reducing valve 52 is provided in the internal space on the base end side of the boom 31.

[0082] The gas pipes forming the hydrogen supply line HL2 and the hydrogen supply line HL3 are also housed within the boom 31.

[0083] In addition, a portion of the gas piping forming the hydrogen supply line HL1 (reduced pressure hydrogen supply line) that supplies hydrogen reduced in pressure by the pressure reducing valve 52 to the power source 41 is also housed in the space inside the boom 31 on the pressure reducing valve 52 side.

[0084] The reduced pressure hydrogen supply line has an opening for leading out the gas piping facing the upper surface of the base end side of the boom 31 so that it extends toward the upper rotating body 20, and the gas piping that forms the reduced pressure hydrogen supply line extends from that opening toward the upper rotating body 20.

[0085] On the other hand, when filling the hydrogen tank 50 with hydrogen, it is necessary to access the hydrogen filling port 51 housed inside the boom 31 .

[0086] Therefore, the work machine 1 of the second embodiment is provided with a door OP1 provided at a position corresponding to the hydrogen filling port 51 at the tip of the boom 31.

[0087] Therefore, an operator or the like can insert the nozzle of the hydrogen dispenser into the hydrogen filling port 51 by opening the door OP1.

[0088] Furthermore, since the hydrogen tank 50, hydrogen filling port 51, and pressure reducing valve 52 are housed in the internal space of the boom 31, as in the first embodiment, it is possible to prevent mud, dust, rainwater, and other water from getting on the hydrogen tank 50, hydrogen filling port 51, and pressure reducing valve 52, and it is also possible to avoid exposing the hydrogen tank 50, hydrogen filling port 51, and pressure reducing valve 52 to direct sunlight.

[0089] Also, similar to the first embodiment, the work machine 1 is provided with a hydrogen tank 50 so as not to interfere with work performed by the work mechanism 30.

[0090] <<Third Embodiment>> Next, a working machine 1 according to a third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a side view of a work machine 1 according to a third embodiment of the present invention, and corresponds to FIG.

[0091] The basic configuration of the third embodiment is similar to that of the first embodiment, and the following mainly describes the differences from the first embodiment, and explanations of the similarities with the first embodiment may be omitted.

[0092] Although not shown in the figure, the hydrogen supply system HSS of the third embodiment includes the hydrogen tank 50, a cover CV1 that covers the pressure reducing valve 52, and a cover CV2 that covers the hydrogen filling port 51, as described with reference to Figure 2 in the first embodiment.

[0093] As shown in Figure 6, the hydrogen supply system HSS of the third embodiment is provided on the hydrogen supply line HL1 (reduced pressure hydrogen supply line) from the pressure reducing valve 52 to the upper rotating body 20, and is equipped with a connection part CP that connects and disconnects between reduced pressure hydrogen supply lines (between the hydrogen supply line HL1 upstream of the connection part CP and the hydrogen supply line HL1 downstream of the connection part CP).

[0094] For example, the connection part CP may be a so-called coupler for general hydrogen gas, which comprises a plug and a socket into which the plug is inserted.

[0095] In addition, a socket or plug may be provided at the downstream end of the hydrogen supply line HL1 upstream of the position where the coupler (connection part CP) of the hydrogen supply line HL1 (reduced pressure hydrogen supply line) is to be provided, and a plug or socket may be provided at the upstream end of the hydrogen supply line HL1 downstream of the position where the coupler (connection part CP) of the hydrogen supply line HL1 (reduced pressure hydrogen supply line) is to be provided. As a result, when the reduced pressure hydrogen supply lines are disconnected, inserting a plug into the socket connects the reduced pressure hydrogen supply lines. Furthermore, when the reduced pressure hydrogen supply lines are connected, removing the plug inserted into the socket will disconnect the reduced pressure hydrogen supply lines.

[0096] In the third embodiment, a gas blocking coupler that blocks gas from being ejected when the connection is released (when the plug is removed from the socket) is used as the connection part CP.

[0097] Therefore, even when the connection is released, hydrogen does not leak from the position of the connection part CP.

[0098] However, if the coupler is not a gas-blocking type that blocks the gas from being ejected, a sealing plug may be provided, for example, when the connection is released.

[0099] In the case of such a work machine 1 of the third embodiment, the work machine 1 is provided with a second hydrogen tank different from the hydrogen tank 50 of the hydrogen supply system HSS in the upper rotating body 20 or the lower running body 10, and the second hydrogen tank is used normally.

[0100] Then, when the hydrogen in the second hydrogen tank runs out, the hydrogen in the hydrogen tank 50 of the hydrogen supply system HSS can be used as emergency hydrogen.

[0101] In this case, the reduced pressure hydrogen supply line of the hydrogen supply system HSS does not need to be connected to the power source 41 so as to be able to supply hydrogen to the power source 41 at all times.

[0102] Therefore, the connection part CP is normally kept in a disconnected state, and is switched to a connected state only when necessary.

[0103] As such, the joint is normally in a disconnected state, so the reduced pressure hydrogen supply line is divided into the upper rotating body 20 side and the hydrogen supply system HSS side. Therefore, even when the working mechanism 30 is operating, no stress is applied to the gas piping that forms the reduced pressure hydrogen supply line, thereby suppressing deterioration of the gas piping.

[0104] When the hydrogen in the second hydrogen tank runs out, the work machine 1 will return to the hydrogen filling location to be refilled with hydrogen. If the hydrogen in the hydrogen supply system HSS is used for the journey during this time, there is no need to drive the work mechanism 30 during this journey, which means that safe use can be expected without stress being applied to the gas piping that forms the reduced pressure hydrogen supply line.

[0105] In the working machine 1 of the third embodiment as described above, the hydrogen supply system HSS is installed in the same manner as in the first embodiment, and therefore the same effects as in the first embodiment are achieved.

[0106] Although the present invention has been described above based on specific embodiments, the present invention is not limited to the above embodiments.

[0107] For example, in the case of the work machine 1 of the third embodiment, the hydrogen tank 50, hydrogen filling port 51, and pressure reducing valve 52 may be accommodated in the space inside the boom 31, as in the second embodiment.

[0108] Furthermore, in the above embodiment, the hydrogen tank 50 is described as being provided on the boom 31 of the working mechanism 30, but this is merely one suitable example, and the hydrogen tank 50 may be provided in any location of the working mechanism 30 that is deemed appropriate, such as on the outer surface of the boom 31 at the tip end of the boom 31, in the internal space of the boom 31 at the tip end of the boom 31, on the outer surface of the arm 32 located on the opposite side of the operator's cab 21 of the arm 32, or in the internal space of the arm 32. If the hydrogen tank 50 is allowed to be within the field of view of the operator in the cab 21, it may be provided on the inner surface of the boom 31 located on the side of the cab 21 (the surface that pairs left and right with the outer surface), the inner surface of the arm 32 located on the side of the cab 21 (the surface that pairs left and right with the outer surface), the top surface of the boom 31, the top surface of the arm 32, etc.

[0109] As described above, the present invention also includes modifications and improvements to the above-described embodiments within the technical scope of the invention, and this will be apparent to those skilled in the art from the description of the claims. [Explanation of symbols]

[0110] 1 working machine, 10 undercarriage, 11 frame, 11A central frame, 11B crawler frame, 12 running mechanism, 20 upper rotating body, 21 operator's cab, 22 machinery room, 30 working mechanism, 31 boom, 32 arm, 33 attachment, 31A boom cylinder, 32A arm cylinder, 33A attachment cylinder, 40 drive system, 41 Power source, 41A... Hydrogen fuel cell, 41B... Electric motor, 42... Operating pump, 42A... Hydraulic oil tank, 43... Control valve, 44... Drive unit, 44A... Swing motor, 44B... Work mechanism cylinder, 44C... Travel motor, 50... Hydrogen tank, 51... Hydrogen filling port, 52... Pressure reducing valve, CP... Connection part, CV1, CV2... Cover, HL1, HL2, HL3... Hydrogen supply line, OP1... Door

Claims

1. A work machine, The work machine includes: a lower running body; an upper rotating body provided so as to be rotatable relative to the lower traveling body; a working mechanism provided on the upper rotating body; a hydrogen-fueled power source provided on the upper rotating body; a hydrogen supply system having a hydrogen tank provided in the working mechanism.

2. The hydrogen supply system comprises: a pressure reducing valve connected to the hydrogen tank; 2. The work machine according to claim 1, further comprising: a reduced-pressure hydrogen supply line extending from the pressure reducing valve toward the upper rotating body.

3. 3. The work machine according to claim 2, wherein the hydrogen supply system is provided on the reduced pressure hydrogen supply line leading to the upper rotating body, and is provided with a connection part for connecting and disconnecting the reduced pressure hydrogen supply lines.

4. 4. The work machine according to claim 1, wherein the hydrogen supply system includes a hydrogen filling port connected to the hydrogen tank.

5. the working mechanism includes a boom having a base end portion that is capable of being raised and lowered relative to the upper rotating body, 5. The work machine according to claim 4, wherein the hydrogen filling port is provided at the tip of the boom.

6. 6. The work machine according to claim 5, wherein the hydrogen tank is provided on an outer surface of the boom located on the opposite side of the boom from a cab provided on the upper rotating body, or inside the boom.

7. 4. The work machine according to claim 3, wherein the work machine is provided with a second hydrogen tank different from the hydrogen tank, the second hydrogen tank being provided on the upper rotating body or the lower traveling body.

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