Electric pump device for construction machine and hydraulic drive system provided with same

Abstract

This electric pump device for construction machinery is mounted on construction machinery, and is provided with: a hydraulic pump that includes a drive shaft and discharges a working fluid when the drive shaft rotates; a motor connected to the drive shaft and configured to rotationally drive the drive shaft; and a support member that supports the hydraulic pump and the motor. The support member is vertically disposed in a first direction orthogonal to a surface on which the construction machine is disposed, and supports the hydraulic pump and the motor such that the drive shaft extends in the first direction.

Description

Technical Field

[0001] This disclosure relates to an electric pump device for construction machinery and a hydraulic drive system for construction machinery. Background Technology

[0002] Electrification is being promoted in construction machinery such as excavators, with the drive source for hydraulic pumps being replaced by electric motors instead of internal combustion engines. An example of such construction machinery is the electric excavator, as described in Patent Document 1.

[0003] Existing technical documents: Patent documents: Patent document 1: Japanese Patent Application Publication No. 2022-163964. Summary of the Invention

[0004] The problem the invention aims to solve: In electric excavators, it is desirable to manufacture them with the same external shape as conventional excavators that use internal combustion engines as their power source. On the other hand, in electric excavators, it is desirable to carry larger batteries in order to extend the driving time. Therefore, if the various structural configurations of electric excavators are the same as those of conventional excavators, it is difficult to ensure space for accommodating larger batteries. Here, in order to ensure space, it is desirable to configure the electric pump unit for construction machinery, which consists of a hydraulic pump and an electric motor, in a compact manner.

[0005] The purpose of this disclosure is to provide an electric pump device for engineering machinery that can be configured more compactly and a hydraulic drive system incorporating the electric pump device.

[0006] Solution methods: The electric pump device for construction machinery disclosed herein is an electric pump device mounted on construction machinery, comprising: a hydraulic pump including a drive shaft and discharging working fluid when the drive shaft rotates; an electric motor connected to the drive shaft and rotatably driving the drive shaft; and a support member supporting the hydraulic pump and the electric motor, the support member being a member that is vertically arranged along a first direction orthogonal to the surface of the construction machinery and supports the hydraulic pump and the electric motor in a manner that allows the drive shaft to extend along the first direction.

[0007] According to this disclosure, a support member is erected along a first direction and supports the hydraulic pump and the electric motor in such a manner that the drive shaft extends along the first direction. Therefore, the installation area of ​​the electric pump unit as seen in the first direction can be reduced. This allows for a more compact configuration of the electric pump unit for construction machinery.

[0008] The hydraulic drive system disclosed herein is a hydraulic drive system that supplies working fluid to a hydraulic actuator equipped with construction machinery for driving. It includes: the aforementioned electric pump device for construction machinery; and a tank for storing working fluid, which is connected to the suction port of the hydraulic pump of the electric pump device for construction machinery via a suction pipe. The tank is configured to be adjacent to the electric pump device for construction machinery in a second direction orthogonal to a first direction, and the suction port is formed on the side of the hydraulic pump.

[0009] According to this disclosure, the tank is configured to be adjacent to the electric pump unit for construction machinery in a second direction. A suction port, connected to the tank via a suction pipe, is formed on the side of the hydraulic pump. Therefore, the length of the suction pipe can be limited.

[0010] Invention effects: According to this disclosure, electric pump units for construction machinery can be configured more compactly.

[0011] The above-mentioned objects, other objects, features and advantages of this disclosure will become clear from the following detailed description of preferred embodiments with reference to the accompanying drawings. Attached Figure Description

[0012] Figure 1 A perspective view of an excavator equipped with a hydraulic drive system according to an embodiment of the present disclosure; Figure 2 To show the mounted on Figure 1 A schematic top view of the hydraulic drive system of an excavator; Figure 3 To show in magnified form Figure 2 An enlarged 3D view of the electric pump unit equipped with the hydraulic drive system; Figure 4 To show Figure 3 An enlarged front view of the electric pump unit; Figure 5 To show the cross-section Figure 3 An enlarged cross-sectional view of a part of an electric pump unit; Figure 6 To show Figure 2 A schematic side view of the hydraulic drive system; Figure 7 An enlarged perspective view of an electric pump device according to other embodiments is shown. Detailed Implementation

[0013] Hereinafter, the hydraulic drive system 1 and its equipped electric pump device 2 according to the embodiments of this disclosure will be described with reference to the aforementioned accompanying drawings. Furthermore, the concept of direction used in the following description is for ease of explanation and is not intended to limit the orientation of the structure of this disclosure to that direction. Also, the hydraulic drive system 1 and electric pump device 2 described below are only one embodiment of this disclosure. Therefore, this disclosure is not limited to any particular embodiment, and additions, deletions, and modifications can be made without departing from the spirit of this disclosure.

[0014] [Construction Machinery] Figure 1 and Figure 2 The construction machinery 3 shown performs various operations by moving the bucket 15 and attachments such as a crane (not shown). In this embodiment, the construction machinery 3 is an electric excavator (hereinafter simply referred to as "excavator") 3. However, the construction machinery 3 is not limited to an excavator 3; it can be a crane, a wheel loader, or an industrial vehicle such as a forklift. That is, the construction machinery 3 can be any machine that moves attachments to perform various operations. The excavator 3 includes a travel device 11, a rotating body 12, a boom 13, a stick 14, and a bucket 15. The travel device 11 includes, for example, a pair of tracks 11L and 11R. Each track 11L and 11R can be moved in various directions by driving. The rotating body 12 is rotatably mounted on the travel device 11 about a rotation axis L1 extending in the vertical direction. The boom 13 is oscillatingly mounted on the rotating body 12 in the vertical direction. The stick 14 is oscillatingly mounted on the tip of the boom 13 in the forward and backward direction. Furthermore, the bucket 15 is oscillatingly mounted on the tip of the stick 14 in the forward and backward direction or in the vertical direction. Additionally, the forward and backward direction is, for example, the direction in which the boom 13 extends.

[0015] Furthermore, hydraulic actuators such as hydraulic motors and cylinders are provided on each of the traveling device 11, the rotating body 12, the boom 13, the stick 14, and the bucket 15. Specifically, a traveling hydraulic motor (not shown) is provided on each of the tracks 11L and 11R of the traveling device 11. The traveling motor drives the tracks 11L and 11R by supplying working fluid. Thus, the traveling device 11 can move in various directions. The working fluid is, for example, a liquid such as oil. A rotating hydraulic motor (not shown) is provided on the rotating body 12. The rotating hydraulic motor rotates the rotating body 12 by supplying working fluid. A boom cylinder 13a is provided on the boom 13. A stick cylinder (not shown) and a bucket cylinder are provided on each of the stick 14 and the bucket 15. The boom cylinder 13a, stick cylinder, and bucket cylinder are respectively supplied with working fluid, thereby causing the boom 13, stick 14, and bucket 15 to swing.

[0016] [Hydraulic drive system] Furthermore, on excavator 3, such as Figure 2As shown, a hydraulic drive system 1 is installed. More specifically, the hydraulic drive system 1 is disposed within the rotating body 12. The hydraulic drive system 1 supplies working fluid to each of the aforementioned hydraulic actuators. Furthermore, the hydraulic drive system 1 controls the flow (flow rate and flow direction) of the working fluid supplied to each hydraulic actuator. The hydraulic drive system 1 thus configured as follows... Figure 2 As shown, it includes a tank 4 and an electric pump unit 2. Further details are provided: the hydraulic drive system 1 also includes multiple control valves 5 and a battery 6.

[0017] [Can] Tank 4 stores working fluid. The working fluid in tank 4 is supplied to each of the hydraulic actuators from the electric pump unit 2 (described in detail later) via multiple control valves 5. Furthermore, the working fluid is returned from each of the hydraulic actuators to tank 4 via multiple control valves 5. Tank 4 is arranged within the rotating body 12, for example, as follows: The rotating body 12 has a compartment 12b for the driver (or operator) to sit in. A boom 13 is provided on the rotating body 12 at the front side and in the middle of the left-right direction. The compartment 12b is arranged adjacent to the boom 13 on the front side and to one side (e.g., the left side) of the rotating body 12. Furthermore, tank 4 is arranged within the rotating body 12, across the boom 13, on the opposite side of the compartment 12b. That is, tank 4 is arranged adjacent to the boom 13 on the front side of the rotating body 12 and on the opposite side (in this embodiment, the right side) of the compartment 12b in the left-right direction.

[0018] [Electric pump unit] An example of an electric pump device for construction machinery, the electric pump device 2 is an electric hydraulic pump device mounted on an excavator 3. The electric pump device 2 includes a hydraulic pump 21 and an electric motor 22. Furthermore, in the electric pump device 2, the hydraulic pump 21 and the electric motor 22 are arranged in a first direction (in this embodiment, the vertical direction) (i.e., longitudinally). The electric pump device 2 configured in this way is disposed on a mounting surface 12a within the rotating body 12 of the excavator 3. In this embodiment, the mounting surface 12a is as follows: That is, the mounting surface 12a is located on the opposite side of the compartment 12b within the rotating body 12, across the boom 13. More specifically, the mounting surface 12a is located behind the tank 4 from a top-down view. The electric pump device 2 is vertically mounted on the mounting surface 12a along a first direction orthogonal to it (in this embodiment, the vertical direction). Therefore, the electric pump device 2 is configured to be adjacent to the tank 4 when mounted on the mounting surface 12a. The electric pump device 2 is also electrically connected to the battery 6. In addition, the electric pump unit 2 is connected to the tank 4 via the suction pipe 7a and to the multi-control valve 5 via the discharge pipe 7b.

[0019] The electric pump unit 2, thus configured, is driven by the current supplied by the battery 6, which will be described later. The electric pump unit 2 is driven to draw in working fluid from the tank 4 via the suction pipe 7a. Furthermore, the electric pump unit 2 is driven to discharge working fluid to the multi-control valve 5 via the discharge pipe 7b. Figure 3 and Figure 4 As shown, in addition to the aforementioned hydraulic pump 21 and electric motor 22, the electric pump unit 2 also includes a support frame 23. Further detailed description reveals that the electric pump unit 2 also includes an inverter 24 and connecting components 25.

[0020] Hydraulic pump 21 Figure 5 The diagram shows a drive shaft 21a. The hydraulic pump 21 drives the drive shaft 21a by rotation, thereby discharging working fluid. The hydraulic pump 21 is, for example, a pump in series with two variable-capacity pump sections (in this embodiment, a variable-capacity swashplate pump) 21c and 21d (see also [reference]). Figure 4 The variable capacity pump units (hereinafter referred to as "pump units") 21c and 21d share the aforementioned drive shaft 21a. The pump units 21c and 21d are arranged in a vertical direction extending along the drive shaft 21a. Furthermore, a housing 21e is provided between the pump units 21c and 21d. Therefore, in this embodiment, the hydraulic pump 21 is formed in an elongated shape along the first direction.

[0021] Furthermore, a suction port 21f and discharge ports 21g and 21h are formed on the side of the hydraulic pump 21. More specifically, a suction port 21f and two discharge ports 21g and 21h are formed on the side of the housing 21e. The suction port 21f and the discharge ports 21g and 21h open on the side of the housing 21e in directions orthogonal to a first direction (e.g., the second and third directions detailed later). In this embodiment, the discharge ports 21g and 21h open in the same direction. Furthermore, the discharge ports 21g and 21h and the suction port 21f open in directions orthogonal to each other. Pump sections 21c and 21d share a suction port 21f and each has its own discharge ports 21g and 21h. Therefore, the hydraulic pump 21 draws in working fluid from the suction port 21f and discharges working fluid from the two ports 21g and 21h. Furthermore, regulators 21i and 21j are respectively installed in pump sections 21c and 21d. Regulators 21i and 21j change the discharge capacity of pump sections 21c and 21d respectively.

[0022] The electric motor 22 is connected to the drive shaft 21a. Furthermore, the electric motor 22 rotates to drive the drive shaft 21a. More specifically, the electric motor 22 drives the drive shaft 21a when current flows. Thus, the electric motor 22 causes the working fluid to be discharged from the hydraulic pump 21. The electric motor 22 is, for example, a three-phase AC motor. More specifically, the electric motor 22 is cylindrical and arranged on the same axis as the drive shaft 21a. That is, the electric motor 22 and the hydraulic pump 21 are arranged in a straight line on the same axis. Specifically, the electric motor 22 is aligned with the hydraulic pump 21 in a straight line in the first direction. However, the electric motor 22 does not necessarily have to be aligned with the hydraulic pump 21; they can also be arranged parallel to each other and with their axes offset, or the axis of the electric motor 22 can be arranged at an angle or right angle to the drive shaft 21a.

[0023] Inverter 24 converts direct current into alternating current. Inverter 24 is electrically connected to motor 22 and battery 6, which will be described later. Inverter 24 converts the direct current supplied by battery 6 into alternating current and flows to motor 22. As a result, motor 22 rotates to drive drive shaft 21a. Inverter 24 is provided, for example, on motor 22. In this embodiment, inverter 24 is integrally formed with motor 22 in a manner located on the opposite side of hydraulic pump 21 in the first direction.

[0024] A connecting member 25 connects the hydraulic pump 21 to the electric motor 22. The connecting member 25 is, for example, a bell-housing. The connecting member 25 has a cylindrical portion 25a and a flange 25b. The cylindrical portion 25a connects the hydraulic pump 21 to the electric motor 22. More specifically, the cylindrical portion 25a is, for example, formed in a cylindrical shape. In this embodiment, the cylindrical portion 25a is formed in a tapered shape such that its axis extends along a first direction and its diameter expands from one side (the lower side in this embodiment) toward the other side (the upper side in this embodiment). Furthermore, the hydraulic pump 21 is mounted at one end of the cylindrical portion 25a on the first direction side, and the electric motor 22 is mounted at the other end on the other side of the first direction. Thus, the hydraulic pump 21 and the electric motor 22 are connected by the connecting member 25. Furthermore, within the cylindrical portion 25a, a drive shaft 21a extends along the axis of the cylindrical portion 25a (i.e., toward the other side of the first direction) and is connected to the electric motor 22. Flange 25b is formed circumferentially around the other end of the cylindrical portion 25a. Flange 25b protrudes radially outward from the other end of the cylindrical portion 25a.

[0025] As an example of a supporting member, the support frame 23, for example Figure 6As shown, the support frame 23 is erected on the mounting surface 12a of the excavator 3 along a first direction (vertical direction in this embodiment). When erected, the support frame 23 supports the hydraulic pump 21 and the electric motor 22 in a manner that extends the drive shaft 21a in the vertical direction. That is, the support frame 23 supports the hydraulic pump 21 and the electric motor 22 in a longitudinal (i.e., vertically) arrangement. In this embodiment, the support frame 23, as... Figures 3 to 5 The image shows a generally rectangular frame. A support frame 23 supports the hydraulic pump 21 and the motor 22 such that the hydraulic pump 21 is located below the motor 22. More specifically, the support frame 23 includes a support portion 31, a mounting portion 32, and a vibration damping member 33. Furthermore, the support frame 23 also includes a lifting member 34.

[0026] The support portion 31 is a member extending in the vertical direction. The support portion 31 has a mounting portion 31a on its lower side and is erected on the mounting surface 12a in such a way that the mounting portion 31a is placed on the mounting surface 12a. The support portion 31 is formed, for example, in a generally cuboid frame shape. More specifically, the support portion 31 has the aforementioned mounting portion 31a, four foot portions 31b, and a top surface portion 31c.

[0027] The setting portion 31a is a portion disposed on the surface 12a to which it is set. In this embodiment, the setting portion 31a is a rectangular plate in a top view. Alternatively, as detailed later, the setting portion 31a may also be the lower end portion 31f of the foot portion 31b (see detailed later). Figure 7 The foot portion 31b is a rod-shaped member extending vertically. The foot portion 31b is, for example, a hollow square column. However, the foot portion 31b can be a hollow cylinder, or a solid square or cylindrical column, channel steel, or L-shaped steel, etc. The foot portions 31b are respectively disposed at the four corners of the mounting portion 31a, extending upwards from the mounting portion 31a. The top surface portion 31c is mounted and fixed on the four foot portions 31b. In this embodiment, the top surface portion 31c is, for example, a rectangular plate, with the foot portions 31b fixed at each of the four corners. Furthermore, on the top surface portion 31c, as... Figure 5 The diagram shows a through hole 31d. The connecting member 25 is inserted into the through hole 31d in the top surface portion 31c.

[0028] The mounting section 32 mounts the hydraulic pump 21 and the electric motor 22. More specifically, the mounting section 32 has a mounting surface 32a. The hydraulic pump 21 and the electric motor 22 are mounted on the mounting surface 32a via a connecting member 25. The mounting section 32 is placed and fixed to the support section 31 (more specifically, the top surface portion 31c) via a vibration damping member 33, which will be described in detail later. Further, the mounting section 32 is formed as a generally rectangular plate. The mounting section 32 has a through hole 32b. The through hole 32b extends through the mounting section 32 in the vertical direction. The drive shaft 21a is inserted into the through hole 32b. In this embodiment, the cylindrical portion 25a of the connecting member 25 is also inserted into the through hole 32b. On the other hand, the through hole 32b is formed with a smaller diameter than the flange 25b. Therefore, the flange 25b is mounted on the mounting section 32 at the periphery of the through hole 32b. That is, the flange 25b is mounted on the upper surface of the mounting portion 32, namely the mounting surface 32a. Furthermore, while mounted on the mounting surface 32a, the flange 25b is fixed by multiple fastening members 32c, such as bolts. Thus, the hydraulic pump 21 and the motor 22 are mounted to the mounting portion 32 via the connecting member 25.

[0029] Furthermore, the mounting part 32 is mounted on the support part 31 as follows: That is, the mounting part 32 is mounted on the support part 31 via the vibration damping member 33 as described above. In this case, the mounting part 32 is mounted on the support part 31 with its mounting surface 32a facing upwards in the opposite direction to the first direction. In other words, the mounting part 32 is mounted on the support part 31 with the flange 25b positioned above the mounting part 32. Therefore, the hydraulic pump 21 is positioned downwards in the first direction than the motor 22. Also, the mounting part 32 is mounted on the support part 31 with the hydraulic pump 21 mounted on the mounting surface 32a positioned above the mounting portion 31a. Therefore, the hydraulic pump 21 can be lifted from the mounting portion 31a.

[0030] Vibration damping member 33 is disposed between mounting portion 32 and support portion 31. Vibration damping member 33 suppresses the transmission of vibration from mounting portion 32 to support portion 31. That is, vibration damping member 33 suppresses the transmission of vibration from hydraulic pump 21 and motor 22 to support portion 31. Vibration damping member 33 is, for example, vibration damping rubber. However, vibration damping member 33 is not limited to vibration damping rubber; it can also be a damper, liquid seal bracket, or other vibration damping mechanism. In this embodiment, vibration damping member 33 is formed, for example, in the shape of a circular plate. Furthermore, vibration damping member 33 does not necessarily have to be circular; it can also be polygonal, etc. Vibration damping member 33 is respectively provided at the four corners of top surface portion 31c. Mounting portion 32 is mounted on the four vibration damping members 33. Mounting portion 32 and top surface portion 31c are fastened by bolts or other fastening members inserted into each of the four vibration damping members 33, with the four vibration damping members 33 disposed between mounting portion 32 and top surface portion 31c. The vibration damping member 33, configured in this way, is positioned closer to the center of gravity of the pump unit 8, which consists of the hydraulic pump 21 and the electric motor 22, compared to the case where it is positioned between the mounting part 32 and the top surface part 31c.

[0031] The lifting member 34 is a component used to lift the support frame 23. More specifically, the lifting member 34 is a component used to lift the electric pump unit 2 itself. The lifting member 34 can be installed on a suspension device such as a crane (not shown). Specifically, the lifting member 34 can be attached to a lifting hook or other lifting device. Furthermore, by pulling up the lifting device, the electric pump unit 2 is lifted. In this embodiment, four lifting members 34 are installed on the mounting part 32, and the lifting members 34 are respectively provided at the four corners of the mounting part 32. In addition, the lifting members 34 only need to be configured such that when the electric pump unit 2 is lifted by the lifting device, the drive shaft 21a extends approximately vertically, that is, in a top view, the center of gravity of the multiple lifting members 34 is located on the drive shaft 21a.

[0032] [Multiple control valves] The multi-control valve 5 supplies the working fluid discharged from the electric pump unit 2 to each of the hydraulic actuators and controls the flow of the supplied working fluid. Further detailed, as previously described, the multi-control valve 5 is connected to the hydraulic pump 21 of the electric pump unit 2 (more specifically, discharge ports 21g and 21h) via discharge pipe 7b. The multi-control valve 5, thus configured, is located behind the boom 13 within the rotating body 12. In this embodiment, the multi-control valve 5 is located within the rotating body 12 adjacent to the electric pump unit 2.

[0033] [Battery] Battery 6 is electrically connected to electric pump device 2 (more specifically, inverter 24). Battery 6 supplies direct current to inverter 24. Battery 6 is disposed within rotating body 12. More specifically, battery 6 is disposed within rotating body 12 at a position rearward of electric pump device 2. In this embodiment, a counterweight 16 is disposed at the very end of rotating body 12. Furthermore, battery 6 is disposed between counterweight 16 and electric pump device 2.

[0034] [Configuration of the electric pump unit] Electric pump unit 2, such as Figure 6 As shown, the mounting surface 12a is erected within the rotating body 12 in an upright position. Furthermore, a tank 4 is positioned in a second direction relative to the electric pump device 2. The second direction is orthogonal to the first direction, and in this embodiment, it is the front-to-back direction. In this embodiment, the second direction is forward. The electric pump device 2 is configured such that the suction port 21f of the hydraulic pump 21 faces a third direction. Here, the third direction is orthogonal to both the first and second directions, and in this embodiment, it is the left-to-right direction. In this embodiment, the third direction is the direction opposite to the direction where the multiple control valve 5 is located, with the electric pump device 2 as a reference; it is the right direction. On the rotating body 12, as shown... Figure 2 As shown, an opening / closing door 12c is formed on the right side of the electric pump unit 2, and the suction port 21f faces the opening / closing door 12c. As previously described, a suction pipe 7a is connected to the suction port 21f. Therefore, the suction pipe 7a can be exposed to the outside by opening the opening / closing door 12c. This facilitates the maintenance of the suction pipe 7a.

[0035] Furthermore, the electric pump unit 2 is configured such that the discharge ports 21g and 21h of the hydraulic pump 21 face rearward. As previously described, discharge pipes 7b are connected to the discharge ports 21g and 21h. Therefore, the discharge pipes 7b are positioned between the electric pump unit 2 and the battery 6. This facilitates the maintenance of the discharge pipes 7b.

[0036] [Setup of electric pump unit] The electric pump unit 2 is installed within the rotating body 12 of the excavator 3 as follows: The lifting device (not shown) is mounted on the lifting part 34 of the electric pump unit 2. After installation, the electric pump unit 2 is lifted by the lifting device and transported to the mounting surface 12a. Then, the mounting portion 31a of the electric pump unit 2 is lowered to the mounting surface 12a. Thus, the electric pump unit 2 is erected on the mounting surface 12a. Therefore, the electric pump unit 2 can be easily installed on the mounting surface 12a within the rotating body 12.

[0037] [Action of the hydraulic drive system] When direct current flows from battery 6 to electric pump device 2, electric pump device 2 operates as follows: Inverter 24 converts direct current into alternating current and flows it to motor 22. Motor 22 then rotates, driving drive shaft 21a. Consequently, hydraulic pump 21 draws in working fluid from tank 4 through suction port 21f via suction pipe 7a and discharges it to discharge ports 21g and 21h. Working fluid is then directed from discharge ports 21g and 21h through discharge pipe 7b to multi-control valve 5, and further supplied to each hydraulic actuator via multi-control valve 5. This enables each hydraulic actuator to move independently.

[0038] In the electric pump device 2 of this embodiment, the support frame 23 is erected upwards and supports the hydraulic pump 21 and the electric motor 22 in such a way that the drive shaft 21a extends upwards. Therefore, the installation area of ​​the electric pump device 2 as viewed from above can be reduced. As a result, the electric pump device 2 can be configured more compactly.

[0039] Furthermore, in the electric pump device 2 of this embodiment, the hydraulic pump 21 is supported on the support frame 23 in a manner that places it below the electric motor 22. Therefore, it is possible to prevent the working fluid leaking from the hydraulic pump 21 from splashing onto the electric motor 22.

[0040] Furthermore, in the electric pump device 2 of this embodiment, the support frame 23 supports the hydraulic pump 21 in a manner that positions it above the mounting portion 31a. Therefore, when the electric pump device 2 is installed, the hydraulic pump 21 is positioned upwards and away from the mounting surface 12a. This suppresses damage to the mounting surface 12a caused by vibration of the hydraulic pump 21.

[0041] Furthermore, in the electric pump device 2 of this embodiment, the connecting member 25 has a flange 25b, and the flange 25b is mounted and fixed to the mounting surface 32a of the support frame 23. Therefore, since the connecting member 25 bears the load of the hydraulic pump 21, the load applied to the electric motor 22 can be suppressed.

[0042] Furthermore, in the electric pump device 2 of this embodiment, the vibration damping member 33 is disposed between the mounting portion 32 and the support portion 31. Therefore, the vibration damping member 33 can be disposed at a position close to the center of gravity of the pump unit 8 composed of the hydraulic pump 21 and the electric motor 22 in the vertical direction. As a result, since the vibration transmitted to the vibration damping member 33 can be suppressed, the vibration damping performance can be further improved.

[0043] Furthermore, in the electric pump device 2 of this embodiment, four lifting components 34 are mounted on the mounting surface 32a of the mounting portion 32. Therefore, the electric pump device 2 can be easily lifted.

[0044] In the hydraulic drive system 1 of this embodiment, the tank 4 is configured to be adjacent to the electric pump unit 2 in the front-rear direction. A suction port 21f, connected to the tank 4 via a suction pipe 7a, is formed on the side of the hydraulic pump 21. Therefore, the length of the suction pipe 7a can be suppressed.

[0045] <Other Implementation Methods> In the electric pump device 2 of this embodiment, the hydraulic pump 21 and the electric motor 22 are arranged in a row on the same axis, but they can also be configured such that the axis of the electric motor 22 intersects (e.g., orthogonally) the axis of the hydraulic pump 21. That is, in the electric pump device 2, it is sufficient that the drive shaft 21a of the hydraulic pump 21 is arranged to extend longitudinally along the first direction. Furthermore, the hydraulic pump 21 is not limited to a series pump, but can also be a single pump. Furthermore, the hydraulic pump 21 is not limited to a swashplate pump, but can also be a swashplate pump or a gear pump. In addition, the hydraulic pump 21 can also be arranged on the other side (i.e., the upper side) of the electric motor 22 in the first direction. Furthermore, the hydraulic pump 21 can also be located at the same position as or lower than the mounting portion 31a. Furthermore, the electric motor 22 is not limited to a three-phase AC motor, but can also be a servo motor or other motors.

[0046] In the electric pump device 2 of this embodiment, the hydraulic pump 21 and the electric motor 22 are connected by a connecting member 25. However, the hydraulic pump 21 and the electric motor 22 can also be directly mounted on the support frame 23 (more specifically, the mounting part 32). Furthermore, the suspended member 34 does not necessarily have to be provided on the mounting part 32; it can also be provided on the support part 31. Also, the flange 25b does not necessarily have to be formed around the entire circumference of the cylindrical part 25a. The flange can also be configured as follows: that is, the flange can also be composed of a plurality of protrusions that project radially outward from the cylindrical part 25a and are spaced apart from each other in the circumferential direction; its shape is not limited.

[0047] In the electric pump device 2 of this embodiment, reinforcing members 31e may also be mounted on two adjacent leg portions 31b in the support frame 23 (see reference). Figure 7 ). Also, such as Figure 7As shown, the mounting portion can be formed by the lower end portion 31f of each of the foot portions 31b, or by other components. Furthermore, the support frame 23 is formed as a frame composed of multiple foot portions 31b, but it can also be formed as a hollow cylinder. In addition, in the support frame 23, the vibration damping member 33 is provided between the top surface portion 31c and the mounting portion 32, but it can also be provided between the mounting portion 32 and the flange 25b. In this case, the vibration damping member 33 is, for example, formed as an annular shape and externally mounted on the cylindrical portion 25a. Furthermore, the vibration damping member 33 can also be provided between the mounting portion 31a and the mounting surface 12a, and between the foot portions 31b and the mounting portion 31a. Furthermore, if the hydraulic pump 21 can be positioned away from the mounting surface 12a by slotting or otherwise cutting into it, a portion of the hydraulic pump 21 can protrude downwards from the mounting surface 12a.

[0048] In the hydraulic drive system 1 of this embodiment, the electric pump device 2 is configured adjacent to the tank 4, but the electric pump device 2 can also be configured away from the tank 4. Furthermore, the suction port 21f of the electric pump device 2 does not necessarily open to a third direction; it can open to one side of the second direction, the other side, or to the other side of the third direction. Similarly, the opening directions of the discharge ports 21g and 21h are not limited to the other side of the second direction.

[0049] <Example Implementation> The electric pump device in the first aspect is an electric pump device mounted on construction machinery, comprising: a hydraulic pump including a drive shaft and discharging working fluid when the drive shaft rotates; an electric motor connected to the drive shaft and rotatably driving the drive shaft; and a support member supporting the hydraulic pump and the electric motor, the support member being erected along a first direction orthogonal to the mounting surface of the construction machinery and supporting the hydraulic pump and the electric motor in a manner that extends the drive shaft along the first direction.

[0050] Based on the above aspects, the support member is erected along the first direction and supports the hydraulic pump and electric motor in a manner that extends the drive shaft along the first direction. Therefore, the installation area of ​​the electric pump unit as seen in the first direction can be reduced. Consequently, the electric pump unit for construction machinery can be configured more compactly.

[0051] In the electric pump device of the second aspect, in the electric pump device of the first aspect, the support member has a mounting portion disposed on the mounting surface on one side in a first direction, and the hydraulic pump is supported on the support member in a manner located on the side in the first direction closer to the electric motor.

[0052] Based on the above aspects, the hydraulic pump is supported on the support member in a manner located on the opposite side from the motor in the first direction. Therefore, it is possible to prevent the working fluid leaking from the hydraulic pump from splashing onto the motor.

[0053] In the electric pump device of the third aspect, in the electric pump device of the second aspect, the support member supports the hydraulic pump in a manner that positions the hydraulic pump on the opposite side of the first direction than the setting portion.

[0054] Based on the above aspects, the support member supports the hydraulic pump in a manner that positions it on the opposite side in the first direction from the mounting portion. Therefore, when installing an electric pump device for construction machinery, the hydraulic pump is positioned away from the mounting surface in the first direction. This suppresses damage to the mounting surface caused by the hydraulic pump's vibration.

[0055] The electric pump device in the fourth aspect, in any of the electric pump devices in the first to third aspects, further includes a connecting member for connecting the hydraulic pump and the electric motor, the supporting member including a mounting surface, the connecting member having a flange, and the flange being mounted and fixed to the mounting surface.

[0056] Based on the above, the connecting member has a flange, and the flange is mounted and fixed to the mounting surface of the supporting member. Therefore, since the connecting member bears the load of the hydraulic pump, it is possible to suppress the load applied to the electric motor.

[0057] The electric pump device in the fifth aspect, in the electric pump device of the fourth aspect, the support member includes: a support portion having a mounting portion disposed on the mounting surface on one side in a first direction; a mounting portion having the mounting surface and mounted on the support portion; and a vibration damping member for suppressing the transmission of vibration from the hydraulic pump and the electric motor to the support portion, the vibration damping member being disposed between the mounting portion and the support portion or between the mounting portion and the connecting member.

[0058] Based on the above aspects, the vibration damping member is positioned between the mounting part and the support part, or between the mounting part and the connecting structural member. Therefore, the vibration damping member can be positioned vertically near the center of gravity of the pump unit, which consists of a hydraulic pump and an electric motor. Consequently, vibrations transmitted to the vibration damping member can be suppressed, thus further improving vibration damping performance.

[0059] The electric pump device in the sixth aspect, in the electric pump device of the fourth aspect, the supporting member includes a plurality of suspended components that suspend the supporting member, the plurality of suspended components being mounted on the mounting surface.

[0060] Based on the above aspects, multiple lifting components are installed on the top surface. Therefore, it is possible to easily lift the electric pump unit for construction machinery.

[0061] The hydraulic drive system in the seventh aspect is a hydraulic drive system that supplies working fluid to a hydraulic actuator equipped with construction machinery for driving, comprising: an electric pump device of any one of the first to sixth aspects; and a tank for storing working fluid, connected via a suction pipe to the suction port of the hydraulic pump of the electric pump device for construction machinery, the tank being configured to be adjacent to the electric pump device for construction machinery in a second direction orthogonal to the first direction, the suction port being formed on the side of the hydraulic pump.

[0062] Based on the above aspects, the tank is configured to be adjacent to the electric pump unit for construction machinery in the second direction. The suction port, connected to the tank via a suction pipe, is formed on the side of the hydraulic pump. Therefore, the length of the suction pipe can be limited.

[0063] Based on the foregoing description, many improvements and other embodiments of this disclosure will be apparent to those skilled in the art. Therefore, the foregoing description should be interpreted as illustrative only and is provided to teach those skilled in the art the best mode of implementation. Details regarding how the construction and / or function can be substantially changed without departing from the spirit of this disclosure are also included.

Claims

1. An electric pump device for engineering machinery, characterized in that, It is an electric pump unit for construction machinery, which is equipped with: Includes a drive shaft and a hydraulic pump that discharges working fluid when the drive shaft rotates; An electric motor connected to the drive shaft and used to rotate and drive the drive shaft; and Supporting components that support the hydraulic pump and the electric motor. The support member is erected along a first direction orthogonal to the surface on which the engineering machinery is installed, and supports the hydraulic pump and the electric motor in such a manner that the drive shaft extends along the first direction.

2. The electric pump device for engineering machinery according to claim 1, characterized in that, The supporting member has a mounting portion disposed on the mounting surface on one side in the first direction. The hydraulic pump is supported on the support member in a manner that is located on the side of the motor in the first direction.

3. The electric pump device for engineering machinery according to claim 2, characterized in that, The support member supports the hydraulic pump in a configuration that is on the opposite side of the first direction than the setting portion.

4. The electric pump device for engineering machinery according to claim 1, characterized in that, It also has a connecting component that connects the hydraulic pump and the electric motor. The support component includes a mounting surface. The connecting member has a flange, and the flange is mounted and fixed to the mounting surface.

5. The electric pump device for engineering machinery according to claim 4, characterized in that, The support member includes: a support portion having a mounting portion disposed on the mounting surface on one side in a first direction; a mounting portion having the mounting surface and mounted on the support portion; and a vibration damping member for suppressing the transmission of vibration from the hydraulic pump and the motor to the support portion. The vibration damping component is disposed between the mounting part and the support part or between the mounting part and the connecting member.

6. The electric pump device for engineering machinery according to claim 4, characterized in that, The support member includes a plurality of suspended components that suspend the support member. The plurality of suspended components are installed on the mounting surface.

7. A hydraulic drive system, characterized in that, It is a hydraulic drive system that supplies working fluid to the hydraulic actuators equipped on construction machinery to drive them, and it has the following features: The electric pump device for engineering machinery as described in claim 1; and A tank for storing working fluid, connected via a suction pipe to the suction port of the hydraulic pump of the electric pump unit for the engineering machinery. The tank is configured to be adjacent to the electric pump unit for construction machinery in a second direction orthogonal to the first direction. The suction port is formed on the side of the hydraulic pump.

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