CN-122029327-A - Electric pump device for construction machine and hydraulic drive system provided with same

Abstract

The electric pump device for a construction machine is an electric pump device mounted on a construction machine, and includes a hydraulic pump that includes a drive shaft and discharges a working fluid when the drive shaft rotates, a motor that is coupled to the drive shaft and rotationally drives the drive shaft, and a support member that supports the hydraulic pump and the motor, the support member being provided upright in a first direction orthogonal to a surface of the construction machine to be placed, and that supports the hydraulic pump and the motor so that the drive shaft extends in the first direction.

Inventors

• NAKAMURA TAKANOBU
• IMAMURA YUKITO
• Tanaka's English is recorded
• Ji Cunyong
• FUJII TOMOYUKI
• TANAKA DAIJI

Assignees

• 川崎重工业株式会社

Dates

Publication Date

20260512

Application Date

20240625

Priority Date

20230829

Claims (7)

1. 1. An electric pump device for engineering machinery is characterized in that, An electric pump device for construction machines mounted on construction machines, comprising: a hydraulic pump that includes a drive shaft and discharges a working fluid when the drive shaft rotates; A motor coupled to the drive shaft for rotationally driving the drive shaft, and A support member that supports the hydraulic pump and the motor, The support member is provided upright in a first direction orthogonal to a surface of the construction machine to be provided, and supports the hydraulic pump and the motor so that the drive shaft extends in the first direction.
2. 2. The electric pump device for construction machine according to claim 1, wherein, The support member has a setting portion provided to the set surface on one side in a first direction, The hydraulic pump is supported by the support member so as to be located on the first direction side with respect to the motor.
3. 3. The electric pump device for construction machine according to claim 2, wherein, The support member supports the hydraulic pump so that the hydraulic pump is disposed on the other side in the first direction than the installation portion.
4. 4. The electric pump device for construction machine according to claim 1, wherein, And a connecting member for connecting the hydraulic pump and the motor, The support member includes a mounting surface, The connecting member has a flange, and the flange is placed on and fixed to the mounting surface.
5. 5. The electric pump device for construction machine according to claim 4, wherein, The support member includes a support portion having an installation portion provided on the installation surface on one side in a first direction, an installation portion having the installation surface and being placed on the support portion, and a vibration isolation member that suppresses transmission of vibrations from the hydraulic pump and the motor to the support portion, The vibration preventing member is disposed between the mounting portion and the supporting portion or between the mounting portion and the coupling member.
6. 6. The electric pump device for construction machine according to claim 4, wherein, The support member includes a plurality of suspended items that suspend the support member, The plurality of suspended pieces are mounted on the mounting surface.
7. 7. A hydraulic drive system is characterized in that, A hydraulic drive system for supplying a working fluid to a hydraulic actuator provided in a construction machine, the hydraulic drive system comprising: the electric pump device for construction machine according to claim 1, and A tank for storing a working fluid, connected to a suction port of the hydraulic pump of the electric pump device for construction machine via a suction pipe, The tank is disposed adjacent to the electric pump device for construction machine in a second direction orthogonal to the first direction, The suction port is formed at a side of the hydraulic pump.

Description

Electric pump device for construction machine and hydraulic drive system provided with same Technical Field The present disclosure relates to an electric pump device for construction machines and a hydraulic drive system for construction machines, which are mounted on construction machines. Background In a construction machine such as an excavator, an electromotive operation is being advanced, and a drive source of a hydraulic pump is replaced with an electric motor from an internal combustion engine. As such a construction machine, for example, an electric excavator of patent document 1 is known. Prior art literature: Patent literature: patent document 1, japanese patent application laid-open No. 2022-163964. Disclosure of Invention Problems to be solved by the invention: In an electric excavator, it is desired to manufacture the excavator in the same external shape as a conventional excavator using an internal combustion engine as a driving source. On the other hand, in an electric excavator, it is desirable to mount a larger battery in order to make the driving time longer. Therefore, if various structures of the electric excavator are arranged in the same manner as the conventional excavator, it is difficult to secure a space to arrange a larger battery. Here, in order to secure a space, it is desirable that the electric pump device for construction machinery, which is composed of the hydraulic pump and the electric motor, be configured to be compactly disposed. The present disclosure is directed to an electric pump device for construction machinery that can be more compactly disposed, and a hydraulic drive system provided with the electric pump device. Means for solving the problems: An electric pump device for a construction machine according to the present invention is an electric pump device mounted on a construction machine, and includes a hydraulic pump that includes a drive shaft and discharges a working fluid when the drive shaft rotates, a motor coupled to the drive shaft and rotationally driving the drive shaft, and a support member that supports the hydraulic pump and the motor, the support member being provided upright in a first direction orthogonal to a surface to be mounted on the construction machine, and supports the hydraulic pump and the motor so that the drive shaft extends in the first direction. According to the present disclosure, the support member is provided upright in the first direction and supports the hydraulic pump and the motor in such a manner that the drive shaft extends in the first direction. Therefore, the installation area of the electric pump device as viewed in the first direction can be reduced. This enables more compact arrangement of the electric pump device for the construction machine. The hydraulic drive system according to the present disclosure is a hydraulic drive system that supplies a hydraulic fluid to a hydraulic actuator provided in a construction machine, and includes the electric pump device for the construction machine, and a tank that stores the hydraulic fluid and is connected to a suction port of the hydraulic pump of the electric pump device for the construction machine via a suction pipe, wherein the tank is disposed adjacent to the electric pump device for the construction machine in a second direction orthogonal to the first direction, and the suction port is formed on a side surface of the hydraulic pump. According to the present disclosure, the tank is arranged adjacent to the electric pump device for the construction machine in the second direction. A suction port connected to the tank via a suction pipe is formed on the side surface of the hydraulic pump. Therefore, the length of the suction pipe can be suppressed. The invention has the following effects: According to the present disclosure, the electric pump device for the construction machine can be more compactly arranged. The above objects, other objects, features and advantages of the present disclosure will become apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. Drawings Fig. 1 is a perspective view showing an excavator on which a hydraulic drive system according to an embodiment of the present disclosure is mounted; FIG. 2 is a schematic top view illustrating a hydraulic drive system mounted on the excavator of FIG. 1; Fig. 3 is an enlarged perspective view showing an electric pump device equipped with the hydraulic drive system of fig. 2 in an enlarged manner; Fig. 4 is an enlarged front view illustrating the electric pump device of fig. 3; FIG. 5 is an enlarged cross-sectional view showing a portion of the electric pump device of FIG. 3 in section; FIG. 6 is a schematic side view illustrating the hydraulic drive system of FIG. 2; Fig. 7 is an enlarged perspective view showing an electric pump device according to another embodiment. Detailed Description Hereinafter, a hydraulic drive system 1 and an electric p