Working machinery

Abstract

This method suppresses the increase in the length of the piping connecting the control valve and the hydraulic pump without interfering with the battery unit. [Solution] The work machine 100 comprises an electric motor 2, a battery unit 3, a control valve 4, and piping 5. The electric motor 2 drives the hydraulic pump 1. The battery unit 3 supplies power to the electric motor 2. The control valve 4 controls the flow of working oil pressurized from the hydraulic pump 1. The piping 5 connects the hydraulic pump 1 and the control valve 4. The piping 5 extends from one of the hydraulic pump 1 and the control valve 4 to the other, passing below the battery unit 3.

Description

Technical Field

[0001] The present invention relates to a working machine.

Background Art

[0002] Conventionally, a working machine including a control valve that controls the flow rate and supply destination of the working oil discharged from a hydraulic pump is known. For example, in the working machine of Patent Document 1, a prime mover, a hydraulic pump, a power source, a control valve, etc. are housed in a machine room arranged behind the cab of the swivel frame. The hydraulic pump is driven by the prime mover. The control valve is interposed between the swivel motor and the hydraulic pump, and controls the direction and flow rate of the pressure oil discharged from the hydraulic pump and supplied to the swivel motor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, a battery unit such as the power source of Patent Document 1 tends to be enlarged in order to increase the power storage amount. Therefore, depending on the arrangement position of the battery unit, there is a risk of interference with the piping (oil passage member) between the control valve and the hydraulic pump. In order to prevent this interference and arrange the piping by bypassing the battery, it is necessary to make the piping longer.

[0005] In view of the above situation, an object of the present invention is to suppress an increase in the length of the piping between the control valve and the hydraulic pump without interfering with the battery unit.

Means for Solving the Problems

[0006] To achieve the above objective, a working machine according to one aspect of the present invention comprises an electric motor, a battery unit, a control valve, and piping. The electric motor drives a hydraulic pump. The battery unit supplies power to the electric motor. The control valve controls the flow of working oil pumped from the hydraulic pump. The piping connects the hydraulic pump and the control valve. The piping extends from one of the hydraulic pump and the control valve to the other, passing below the battery unit.

[0007] Further features and advantages of the present invention will be further revealed by the embodiments described below. [Effects of the Invention]

[0008] According to the present invention, it is possible to suppress an increase in the length of the piping connecting the control valve and the hydraulic pump without interfering with the battery unit. [Brief explanation of the drawing]

[0009] [Figure 1] A schematic side view showing an example configuration of a hydraulic excavator according to this embodiment. [Figure 2] A schematic block diagram showing the electrical and hydraulic systems of a hydraulic excavator. [Figure 3] A perspective view of the engine room interior, looking diagonally upwards from below. [Figure 4] A perspective view of the engine room interior, looking diagonally downwards from above. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a schematic side view showing an example of the configuration of a hydraulic excavator 100 according to this embodiment. Figure 2 is a schematic block diagram showing the configuration of the electrical and hydraulic systems of the hydraulic excavator 100. The hydraulic excavator 100 is an example of a "working machine" of the present invention.

[0011] <1. Hydraulic Excavator 100> The hydraulic excavator 100 comprises a lower traveling body 200, a work implement 300, and an upper rotating body 400.

[0012] In this disclosure, direction is defined as follows. First, in the upper slewing body 400, the direction from one side to the other of the driver's seat 4011 (described later) where the operator (driver, pilot) is seated is defined as the "forward-rear direction." Of the "forward-rear direction," the direction from the rear side to the front side of the driver's seat 4011 is defined as "forward," and the direction from the front side to the rear side of the driver's seat 4011 is defined as "rear." Therefore, when the upper slewing body 400 is not slewing relative to the lower traveling body 200 (slewing angle 0°), the forward-rear direction of the upper slewing body 400 coincides with the direction in which the lower traveling body 200 moves forward and backward.

[0013] Furthermore, when viewed from the rear towards the front, the direction from one side of the driver's seat 4011 to the other is referred to as the "left-right direction." Of the left-right directions, the direction of the driver's seat 4011 toward the left is referred to as the "leftward direction," and the direction of the driver's seat 4011 toward the right is referred to as the "rightward direction."

[0014] Furthermore, the direction from one of the lower traveling body 200 and the upper rotating body 400 to the other is defined as the "up and down direction." Of the up and down directions, the direction from the lower traveling body 200 to the upper rotating body 400 is defined as "upward," and the direction from the upper rotating body 400 to the lower traveling body 200 is defined as "to the right." Therefore, when the hydraulic excavator 100 is positioned on a horizontal plane with the vertical direction as the normal direction, the up and down direction of the hydraulic excavator 100 coincides with the vertical direction. Moreover, the upward direction coincides with the vertical upward direction, and the downward direction coincides with the vertical downward direction.

[0015] The front-rear direction, the left-right direction, and the up-down direction are perpendicular to each other. In the present disclosure, the left-right direction is an example of the "first direction" of the present invention. "Right" is an example of "one side of the first direction" of the present invention, and "left" is an example of "the other side of the first direction" of the present invention. Further, the front-rear direction in the present disclosure is an example of the "second direction" of the present invention. Also, "front" is an example of "one side of the second direction" of the present invention, and "rear" is an example of "the other side of the second direction" of the present invention.

[0016] However, the above definitions of directions are merely used for explanation and are not intended to limit the actual positional relationship and direction.

[0017] <1-1. Lower traveling body 200> The lower traveling body 200 includes a pair of left and right crawlers 201 and a pair of left and right traveling motors 202. Each traveling motor 202 is a hydraulic motor. By driving the left and right crawlers 201 by the left and right traveling motors 202 respectively, the hydraulic excavator 100 can move forward and backward in the front-rear direction.

[0018] <1-2. Working machine 300> The working machine 300 includes a boom 301, an arm 302, and a bucket 303. By driving the boom 301, the arm 302, and the bucket 303 independently, excavation work such as earth and sand can be performed. The boom 301 is rotated by a boom cylinder 304. The boom cylinder 304 has a base end portion supported by the front portion of the upper swing body 400 and is movable in a telescopic manner. The arm 302 is rotated by an arm cylinder 305. The arm cylinder 305 has a base end portion supported by the boom 301 and is movable in a telescopic manner. The bucket 303 is rotated by a bucket cylinder 306. The bucket cylinder 306 has a base end portion supported by the arm 302 and is movable in a telescopic manner. The boom cylinder 304, the arm cylinder 305, and the bucket cylinder 306 are constituted by hydraulic cylinders.

[0019] <1-3. Upper swing body 400> The upper slewing body 400 is located above the lower traveling body 200 and is provided so as to be slewed with respect to the lower traveling body 200 via a slewing bearing (not shown). The upper slewing body 400 includes an operation unit 401, a machine body frame 402, a slewing motor 403, an engine room 404, and a bonnet 405. A driver's seat 4011 is arranged in the operation unit 401. Various levers 4012 are arranged around the driver's seat 4011. When an operator sits on the driver's seat 4011 and operates the lever 4012, a hydraulic actuator 41 (see FIG. 2) is driven. Thereby, the hydraulic excavator 100 can perform traveling of the lower traveling body 200, excavation work by the working machine 300, slewing of the upper slewing body 400, and the like. The machine body frame 402 is in a plate shape that extends vertically. Various devices mounted on the operation unit 401, the slewing motor 403, and the engine room 404 are mounted on the machine body frame 402. The bonnet 405 is a housing having the engine room 404 inside and is arranged below the operation unit 401. The bonnet 405 covers the engine room 404 together with the step of the operation unit 401, the machine body frame 402, and the like. The upper slewing body 400 slews via the slewing bearing by driving of the slewing motor 403 which is a hydraulic motor.

[0020] The upper slewing body 400 further includes an electric motor 2, a battery unit 3, a power supply cable 31, a charger 622, an inverter 623, a PDU (power drive unit) 624, a junction box 625, a DC-DC converter 626, a system controller 627, and a lead battery 628. Further, the upper slewing body 400 further includes a hydraulic pump 1, a control valve 4, a cylindrical oil passage member 5, a hydraulic actuator 41, and a reservoir 42. All of these are housed in the engine room 404.

[0021] Note that the hydraulic excavator 100 may have a configuration in which hydraulic devices such as the hydraulic actuator 41 and an actuator driven by electricity are used in combination. Examples of the actuator driven by electricity include an electric traveling motor, an electric cylinder, and an electric slewing motor.

[0022] <1-3-1. Electrical System Configuration> The electric motor 2 consists of a permanent magnet motor, an induction motor, etc., and drives the hydraulic pump 1. The electric motor 2 receives power from the battery unit 3 via the PDA 624, junction box 625, and inverter 623. The electric motor 2 is supported on the aircraft frame 402 via vibration-damping support members.

[0023] The battery unit 3 consists of a rechargeable secondary battery, such as a lithium-ion battery, and supplies power to the electric motor 2. The battery unit 3 may be composed of multiple battery cells unitized together, as in this embodiment, or it may consist of a single battery cell.

[0024] The charger 622 converts the AC voltage supplied from the commercial power source via a power supply cable (not shown) into a DC voltage and outputs it to the inverter 623.

[0025] The inverter 623 converts the DC voltage supplied from the battery unit 3 into AC voltage and supplies it to the electric motor 2. This causes the electric motor 2 to rotate. The supply of AC voltage (current) from the inverter 623 to the electric motor 2 is performed based on a rotation command output from the system controller 627.

[0026] The PDU624 is a battery control unit that controls the input and output of battery unit 3 by controlling the internal battery relay.

[0027] The junction box 625 includes a charger relay, an inverter relay, a fuse, and the like. The voltage output from the charger 622 is supplied to the battery unit 3 via the junction box 625 and the PDU 624. The voltage output from the battery unit 3 is supplied to the inverter 623 via the PDU 624 and the junction box 625.

[0028] The DC-DC converter 626 steps down the high-voltage (e.g., 300V) DC voltage supplied from the battery unit 3 via the junction box 625 to a low voltage (e.g., 12V). The voltage output from the DC-DC converter 626, along with the output from the lead-acid battery 628, is supplied to the system controller 627 and the like.

[0029] The system controller 627 consists of an electronic control unit, also known as an ECU (electronic control unit), and controls each component of the hydraulic excavator 100.

[0030] The lead-acid battery 628 outputs a low-voltage (e.g., 12V) DC voltage. The output from the lead-acid battery 628 is supplied as a control voltage to, for example, the system controller 627.

[0031] <1-3-2. Hydraulic System Configuration> The hydraulic pump 1 is connected to the output shaft of the electric motor 2 and supplies hydraulic fluid (so-called pressurized oil) to the hydraulic motor and hydraulic cylinders. The hydraulic motor includes, for example, left and right travel motors 202 and a slewing motor 403. The hydraulic cylinders include, for example, a boom cylinder 304, an arm cylinder 305, and a bucket cylinder 306. The hydraulic motor and hydraulic cylinders, which are driven by the hydraulic fluid supplied from the hydraulic pump 1, are collectively referred to as the hydraulic actuator 41.

[0032] The hydraulic pump 1 may be a variable displacement pump or a fixed displacement pump. In this embodiment, there is one hydraulic pump 1 (see Figure 3). However, the embodiment is not limited to this example, and there may be multiple hydraulic pumps 1.

[0033] Furthermore, the hydraulic pump 1 is connected to the reservoir 42 via a hydraulic hose 43. The reservoir 42 is a working oil tank that contains (stores) hydraulic fluid. When the hydraulic pump 1 is driven by the electric motor 2, the hydraulic fluid in the reservoir 42 is supplied to the hydraulic actuator 41 via the control valve 4. This drives the hydraulic actuator 41.

[0034] The control valve 4 has multiple directional control valves and controls the flow (flow direction and flow rate, etc.) of the working oil pumped from the hydraulic pump 1. For example, the control valve 4 supplies the working oil to a hydraulic actuator 41 or the like.

[0035] The oil passage member 5 is an example of the "piping" of the present invention and connects the hydraulic pump 1 and the control valve 4. Working oil, which is pumped from the hydraulic pump 1 to the control valve 4, can flow through the oil passage member 5. For example, the oil passage member 5 can be a hydraulic hose, a steel pipe, etc. However, this example does not exclude configurations in which the oil passage member 5 is neither a hydraulic hose nor a steel pipe.

[0036] <1-3-3. Internal configuration of engine room 404> Figure 3 is a bottom view showing an example of the internal configuration of the engine room 404 of the hydraulic excavator 100, viewed from below. Figure 4 is a perspective view showing an example of the internal configuration of the engine room 404 of the hydraulic excavator 100, viewed from diagonally above. Note that Figure 3 includes the dashed line III-III in Figure 1 and shows the interior of the engine room 404 viewed upwards from a plane perpendicular to the vertical direction.

[0037] As shown in Figure 3, the oil passage member 5 extends from one of the hydraulic pump 1 and the control valve 4 to the other, passing below the battery unit 3. Because the oil passage member 5 extends below the battery unit 3, even if a large-capacity battery unit 3 is placed in the engine room 404, the oil passage member 5 can be positioned without significantly detouring the battery unit 3. Therefore, the hydraulic excavator 100 can suppress an increase in the length of the oil passage member 5 connecting the hydraulic pump 1 and the control valve 4 without interfering with the battery unit 3.

[0038] The single oil passage member 5 connecting the hydraulic pump 1 and the control valve 4 may be a single cylindrical member (i.e., a single pipe), or it may be composed of multiple cylindrical members connected in series (i.e., multiple pipes connected in series). For example, in the latter case, the oil passage member 5 may have a first oil passage member 51, a second oil passage member 52, and a third oil passage member 53. The first oil passage member 51 is an example of the "first pipe" of the present invention, and in this embodiment it is cylindrical and extends from the hydraulic pump 1. The second oil passage member 52 is an example of the "second pipe" of the present invention, and in this embodiment it is cylindrical and extends from the control valve 4. The third oil passage member 53 is an example of the "third pipe" of the present invention, and in this embodiment it is cylindrical, positioned below the battery unit 3, and connects the first oil passage member 51 and the second oil passage member 52. Dividing the oil passage member 5 in this way makes it easier to arrange and install the oil passage member 5.

[0039] In this embodiment, the first oil passage member 51, the second oil passage member 52, and the third oil passage member 53 are different members. However, the embodiment is not limited to this example, and the first oil passage member 51 and the second oil passage member 52 may be a single unit, that is, they may be different parts of a single member. Alternatively, the second oil passage member 52 and the third oil passage member 53 may be a single unit, that is, they may be different parts of a single member.

[0040] Preferably, the control valve 4 is positioned on one side of a first direction intersecting the vertical direction of the machine frame 402. The hydraulic pump 1 is positioned on the other side of this first direction. For example, in this embodiment, the control valve 4 is positioned on the left side of the machine frame 402, and the hydraulic pump 1 is positioned on the right side. The hydraulic pump 1 is also connected to the right side of the electric motor 2. This allows for efficient arrangement of the hydraulic pump 1 and the control valve 4 on the machine frame 402. Even if the arrangement of the battery unit 3 causes a large distance between the hydraulic pump 1 and the control valve 4, the hydraulic excavator 100 can prevent the length of the oil passage member 5 from becoming unnecessarily long in order to prevent interference with the battery unit 3.

[0041] More preferably, in the first direction described above, the electric motor 2 is positioned between the battery unit 3 and the hydraulic pump 1. In this embodiment, the electric motor 2 is positioned between the battery unit 3 and the hydraulic pump 1 in the left-right direction. This allows the electric motor 2 to be positioned closer to the battery unit 3. Consequently, the cable 31 (see Figure 3) for supplying power from the battery unit 3 to the electric motor 2 can be made shorter. Thus, the cable 31 can be arranged more efficiently.

[0042] Power from the battery unit 3 flows through the cable 31. Preferably, the cable 31 is arranged between the battery unit 3 and the oil passage member 5. By arranging the cable 31 and the oil passage member 5 three-dimensionally in this way, the power supply cable 31 can be arranged in a space-saving manner.

[0043] Preferably, the battery unit 3 is positioned on one side of the aircraft frame 402 in a first direction intersecting the vertical direction, for example, on the left side of the aircraft frame 402 in this embodiment. This allows for efficient placement of the battery unit 3 on the aircraft frame 402.

[0044] More preferably, the control valve 4 is positioned on one side of the battery unit 3 in a second direction. This second direction is perpendicular to both the vertical and first directions. For example, in this embodiment, the control valve 4 is positioned in front of the battery unit 3 on the aircraft frame 402. This allows the control valve 4 to be efficiently positioned on the aircraft frame 402 without interfering with the battery unit 3.

[0045] Furthermore, as shown in Figure 3, a pair of plate portions 6 are provided protruding from the machine frame 402. In other words, the upper rotating body 400 further comprises a pair of plate portions 6. The pair of plate portions 6 are aligned in the first direction described above and extend in the second direction described above. In this embodiment, the pair of plate portions 6 are aligned in the left-right direction and extend in the front-rear direction toward the rear from the connection portion with the work machine 300 located at the front end of the machine frame 402. The pair of plate portions 6 are plate members for reinforcing the connection portion. In the following, in Figure 3, the left plate portion 6 of the pair of plate portions 6 may be referred to as "plate portion 6L," and the right plate portion 6 may be referred to as "plate portion 6R."

[0046] Preferably, the oil passage member 5 extends through the pair of plate portions 6 in the first direction described above. For example, in this embodiment, a recess 61 is provided in each of the plate portions 6L and 6R. The recess 61 is recessed upward from the lower part of the plate portions 6L and 6R and opens on both sides in the left-right direction. The oil passage member 5 extends in the left-right direction through the recess 61 of each of the plate portions 6L and 6R. However, the invention is not limited to this example, and at least one of the recesses 61 may be replaced by a through hole through which the oil passage member 5 passes. In this way, the oil passage member 5 can be provided without bypassing the pair of plate portions 6 (6L and 6R). Therefore, an increase in the length of the oil passage member 5 can be suppressed.

[0047] Preferably, the control valve 4 is positioned to one side of the pair of plate portions 6 in the first direction described above. For example, in this embodiment, the control valve 4 is positioned to the left of the left plate portion 6L. This allows the control valve 4 to be positioned without interfering with the pair of plate portions 6 (6L, 6R).

[0048] More preferably, the hydraulic pump 1 is positioned to the other side of the pair of plate portions 6 in the first direction described above. For example, in this embodiment, the hydraulic pump 1 is positioned to the right of the right plate portion 6R. In this way, the hydraulic pump 1 is positioned on the opposite side of the control valve 4 in the first direction (left-right direction in Figure 3), with the pair of plate portions 6 (6L, 6R) in between. Therefore, the hydraulic pump 1 can be efficiently positioned in the machine frame 402 without interfering with the control valve 4.

[0049] Preferably, a holding portion 7 may be provided on the aircraft frame 402. In other words, the upper rotating body 400 may further include a holding portion 7. The holding portion 7 is positioned between a pair of plate portions 6 and holds the oil passage member 5. In this way, the holding portion 7 can suppress or prevent vibration of the oil passage member 5.

[0050] More preferably, the holding portion 7 holds the oil passage member 5 via an elastic member or a cushioning member. This allows the holding portion 7 to more effectively suppress or prevent vibrations of the oil passage member 5. Furthermore, it can suppress or prevent the generation of noise at the holding portion 7 of the oil passage member 5 caused by such vibrations. However, this example does not exclude a configuration in which the holding portion 7 holds the oil passage member 5 without an elastic member or a cushioning member.

[0051] In Figure 3, two retaining parts 7 hold the oil passage member 5 on the lower side of the battery unit 3. However, the number of retaining parts 7 is not limited to this example, and there may be one or more retaining parts 7. Also, at least one retaining part 7 does not have to be located on the lower side of the battery unit 3.

[0052] <2. Remarks> The embodiments of the present invention have been described above. It should be noted that the embodiments described above are illustrative, and various modifications are possible in the combination of each component and each process, and this will be understood by those skilled in the art as being within the scope of the present invention.

[0053] For example, in the embodiments described above, a hydraulic excavator 100, which is a construction machine, was used as an example of the "working machine" of the present invention. However, this example does not exclude configurations in which the present invention can be applied to working machines other than the hydraulic excavator 100. For example, the "working machine" of the present invention may be other construction machines such as a wheel loader, or agricultural machines such as a combine harvester or tractor.

[0054] <3. Summary> The embodiments described so far will be summarized below.

[0055] For example, the work machine 100 disclosed herein is An electric motor 2 drives the hydraulic pump 1, A battery unit 3 that supplies power to the electric motor 2, A control valve 4 controls the flow of the working oil pumped from the hydraulic pump 1, A pipe 5 connecting the hydraulic pump 1 and the control valve 4, Equipped with, The piping 5 is configured to extend from one of the hydraulic pump 1 and the control valve 4 to the other, passing through the lower side of the battery unit 3 (first configuration).

[0056] The work machine 100 with the above first configuration is The aforementioned pipe 5 is A cylindrical first pipe 51 extending from the hydraulic pump 1, A cylindrical second pipe 52 extending from the control valve 4, A cylindrical third pipe 53 is located below the battery unit 3 and connects the first pipe 51 and the second pipe 52, This also refers to a configuration having (the second configuration).

[0057] Furthermore, the work machine 100 having the first or second configuration described above, The machine further comprises a frame 402 on which the hydraulic pump 1 and the control valve 4 are mounted, The control valve 4 is positioned on one side (left) of the first direction that intersects the vertical direction of the aircraft frame 402. The hydraulic pump 1 may be configured to be located on the other (right) side of the first direction (third configuration).

[0058] Furthermore, the work machine 100 with the third configuration described above is The aforementioned aircraft frame 402 is further equipped with the electric motor 2, The electric motor 2 may be configured to be positioned between the battery unit 3 and the hydraulic pump 1 (fourth configuration).

[0059] Furthermore, the work machine 100 having the third or fourth configuration described above, The aforementioned aircraft frame 402 further mounts the battery unit 3, The battery unit 3 may be configured to be positioned on one side (left side) of a first direction that intersects the vertical direction on the aircraft frame 402 (fifth configuration).

[0060] Furthermore, the work machine 100 of the fifth configuration described above is The control valve 4 may be positioned on one side (forward) of the battery unit 3 in the vertical direction and in the second direction (front-to-back direction) which is perpendicular to the first direction (left-to-right direction) (sixth configuration).

[0061] Furthermore, the work machine 100 having any of the above configurations 1 to 6 is, The machine further comprises a frame 402 on which the hydraulic pump 1 and the control valve 4 are mounted, The aircraft frame 402 is further provided with a pair of plate portions 6 that protrude from it and are arranged in a first direction (left-right direction) that intersects with the vertical direction, The pair of plate portions 6 extend in the vertical direction and in a second direction (front-to-back direction) perpendicular to the first direction (left-to-right direction), The piping 5 may also be configured to extend in the first direction (left-right direction) through the pair of plate portions 6 (seventh configuration).

[0062] Furthermore, the work machine 100 of the seventh configuration described above is The control valve 4 may be configured to be positioned to one side (left) of the pair of plate portions 6 in the first direction (eighth configuration).

[0063] Furthermore, the work machine 100 of the eighth configuration described above is The hydraulic pump 1 may be configured to be positioned to the other side (right) of the pair of plate portions 6 in the first direction (the ninth configuration).

[0064] Furthermore, the work machine 100 having any of the configurations described in the 7th to 9th above, The aforementioned aircraft frame 402 further includes a holding portion 7 positioned between a pair of plate portions 6 to hold the piping 5, The piping 5 may be configured as either a hydraulic hose or a steel pipe (the tenth configuration).

[0065] Furthermore, the work machine 100 having any of the above configurations 1 to 10 is, The system further includes a cable 31 through which power output from the battery unit 3 flows, The cable 31 may be configured to pass between the battery unit 3 and the piping 5 (the 11th configuration).

[0066] This invention can be used, for example, in work machinery such as construction machinery and agricultural machinery. [Explanation of symbols]

[0067] 100...Hydraulic excavator (working machine), 200...Lower chassis, 201...Crawler, 202...Travel motor, 300...Working equipment, 301...Boom, 302...Arm, 303...Bucket, 304...Boom cylinder, 305...Arm cylinder, 306...Bucket cylinder, 400...Upper slewing body, 401...Control unit, 4011...Driver's seat, 4012...Lever, 402...Machine frame, 403...Slewing motor, 404...Engine room, 405...Bonnet, 600...Electrical equipment, 622...Charger, 623...Inverter, 6 24...PDU, 625...Junction box, 626...DC-DC converter, 627...System controller, 628...Lead-acid battery, 1...Hydraulic pump, 2...Electric motor, 3...Battery unit, 31...Cable, 4...Control valve, 41...Hydraulic actuator, 42...Reservoir, 43...Hydraulic hose, 5...Oil passage component (piping), 51...First oil passage component (second piping), 52...Second oil passage component (second piping), 53...Third oil passage component (third piping), 6, 6L, 6R...Plate section, 61...Recess, 7...Retaining section,

Claims

1. An electric motor that drives the hydraulic pump, A battery unit that supplies power to the electric motor, A control valve that controls the flow of working oil pumped from the hydraulic pump, A piping connecting the hydraulic pump and the control valve, Equipped with, The piping extends from one of the hydraulic pump and the control valve to the other, passing below the battery unit, in the working machine.

2. The aforementioned piping is A cylindrical first pipe extending from the hydraulic pump, A cylindrical second pipe extending from the control valve, A cylindrical third pipe is located below the battery unit and connects the first pipe and the second pipe, The work machine according to claim 1, having the following features.

3. The machine further comprises a frame on which the hydraulic pump and the control valve are mounted, The control valve is positioned on one side in a first direction that intersects with the vertical direction of the aircraft frame. The work machine according to claim 1 or claim 2, wherein the hydraulic pump is located on the other side of the first direction.

4. The aforementioned aircraft frame is further equipped with the aforementioned electric motor, The electric motor is positioned between the battery unit and the hydraulic pump, as described in claim 3.

5. The aforementioned aircraft frame further mounts the aforementioned battery unit, The work machine according to claim 3, wherein the battery unit is arranged on one side of the machine frame in a first direction that intersects the vertical direction.

6. The work machine according to claim 5, wherein the control valve is positioned on one side of the battery unit in the vertical direction and in a second direction perpendicular to the first direction.

7. The machine further comprises a frame on which the hydraulic pump and the control valve are mounted, The aircraft frame is further provided with a pair of plate portions that protrude from it and are aligned in a first direction intersecting the vertical direction, The pair of plate portions extend in the vertical direction and in a second direction perpendicular to the first direction, The work machine according to claim 1 or claim 2, wherein the piping extends in the first direction through a pair of plate portions.

8. The work machine according to claim 7, wherein the control valve is positioned to one of the pair of plate portions in the first direction.

9. The work machine according to claim 8, wherein the hydraulic pump is positioned to the other of the pair of plate portions in the first direction.

10. The aforementioned aircraft frame further includes a holding portion arranged between a pair of plate portions to hold the piping, The work machine according to claim 7, wherein the piping is either a hydraulic hose or a steel pipe.

11. The system further includes a cable through which power output from the aforementioned battery unit flows, The work machine according to claim 1 or claim 2, wherein the cable is arranged between the battery unit and the piping.

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