JPH04165101A - Hydraulic pressure source device - Google Patents

Abstract

PURPOSE:To prevent a temperature rise of an electric motor by immersing a hydraulic pump and the electric motor along the flowing direction of operating liquid in a tank, providing flowing holes on both ends of an electric motor casing, arranging an operating oil return passage member and the suction portion of a hydraulic pump, and immersing a stator and a rotator in the operating liquid. CONSTITUTION:Flow passages 3A and 3B are formed by a partition board 2 vertically arranged inside a tank 1 and having its one part notched. A return passage member 13 of the operating oil is opened in the flow passage 3A, and an electric motor 4 and a hydraulic pump 5 are arranged in the flow passage 3B along the flow direction of the operating oil. Further, flowing holes 4D and 4E are provided on both ends of the casing 4A of the electric motor 4. When the hydraulic pump 5 is driven by electrification of the electric motor 4, the operating liquid is sucked from a strainer 16 through a sucking tube 14, and it is discharged from the hydraulic pump 5 to a joint block member 10 through a flexible tube 12. Consequently, the electric motor is cooled by the flow of the operating oil so as to prevent the temperature rise and improve efficiency of the whole device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hydraulic pressure source device in which an electric motor and a hydraulic pump driven by the electric motor are immersed and housed in a hydraulic fluid inside a tank.

[Conventional technology]

Conventionally, this type of hydraulic source device is disclosed in Japanese Patent Application Laid-open No. 1-188701.
The structure is as shown in Figure 5 of the publication, and the electric motor and hydraulic pump are integrally connected and suspended from the upper plate of the tank and immersed in the working fluid. The hydraulic fluid stored in the tank is discharged to the hydraulic actuator, and the discharged hydraulic fluid is also returned to the tank, so that the operating noise of the electric motor and hydraulic pump is attenuated by the hydraulic fluid, reducing noise and cooling the electric motor. is obtained by the hydraulic fluid.

[Problem that the invention seeks to solve]

However, with this configuration, the flow of hydraulic fluid to the motor is not actively created, so the hydraulic fluid tends to stagnate around the motor, and the motor is not cooled properly, causing the motor to exceed the allowable value. In order to prevent the temperature from rising, the output of the electric motor must be limited during use, which poses a problem of lowering the operating efficiency of the device.

The present invention solves this problem by actively creating a flow of hydraulic fluid inside the tank, and using the cooling effect of this flowing hydraulic fluid to prevent the temperature of the motor from rising. It provides:

[Means for solving problems]

Therefore, in the present invention, a single partition plate is arranged vertically on the bottom plate inside the tank storing the hydraulic fluid to form a flow path for the hydraulic fluid. An electric motor and a hydraulic pump driven by the electric motor are disposed immersed in the hydraulic fluid, and a return path member through which the hydraulic fluid discharged by the hydraulic pump and returned to the tank flows and a suction part of the hydraulic pump are arranged. The flow passages at both ends of the electric motor are provided with openings into the working fluid, and the motor has circulation holes at both ends of the casing that guide the working fluid flowing through the flow passages so that the stator and rotor inside the casing are immersed in the working fluid. It is set up.

[For production]

As described above, in the present invention, when the hydraulic pump is operated by energizing the electric motor, the hydraulic fluid that is returned from the return path member to the inside of the tank flows through the flow path and is sucked in again from the suction portion of the hydraulic pump. Ru. For this reason, a flow of working fluid is actively created in the flow path, and the motor is well cooled by the working fluid flowing inside and outside, preventing temperature rise, and effectively increasing the output of the motor to the allowable value. Can be used,
The operating efficiency of the device can be improved.

〔Example] Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, ■ indicates a tank, and includes the bottom plate IA and the four side plates IB, Ic, ID, and IE around the bottom plate IA.
The upper plate IF is removably mounted on the upper ends of the four side plates IB and E, and the bottom plate IA is inclined downward with the bottom plate IA toward the center. The partition plate 2 has a lower end in contact with the bottom plate IA, an upper end extending above the liquid level, and one end in contact with the side plate IC to open the tank. Internally, communicating flow paths 3A and 3B are formed through which the working fluid flows. 4 is an electric motor, and 5 is a hydraulic pump that is driven by the electric motor 4 and sucks and discharges hydraulic fluid. Both are integrally connected and are attached to a pedestal 6, which is connected to a flow path 3B along the flow direction of the hydraulic fluid. It is placed so that it can be immersed in the water. As detailed in FIG. 3, the electric motor 4 has a space inside its casing 4A that accommodates a stator 4B and a rotor 4C. The hydraulic fluid flowing through the flow path 3B is introduced into the casing 4A so that the child 4C is immersed in the hydraulic fluid (flow holes 4D and 4E are provided. 4F is an excitation coil provided in the stator 4B,
G is a flow passage provided through the stator 4B, one of the flow holes 4D
The hydraulic fluid guided into the casing 4A from the stator 4B and the rotor 40 flows through the gap between the stator 4B and the rotor 40 and the flow path 4G, and is allowed to flow out of the casing 4A through the other flow hole 4E.

Further, the pedestal 6 has a mounting frame portion 6A on the upper side, and side plates IB and IB.
The receiver fixed to the upper inner wall of C is a vibration-proof rubber 8 supported by a metal fitting 7.
A mounting frame portion 6A is placed on top and fixed by a mounting bracket 9. 10111 indicates a joint block member provided on the upper plate IF of tank l, and joint block member IO is hydraulic pump 5.
A flexible pipe 12 extending from a discharge portion of the tank 1 is connected inside the tank 1, and a supply pipe (not shown) is connectably provided outside the tank 1 to guide the discharged hydraulic fluid to a hydraulic actuator.

The joint block member 11 has a return passage member 13 connected to the inside of the tank l and opened into the hydraulic fluid in the flow path 3A, and has a return passage member 13 (not shown) so as to return the hydraulic fluid discharged from the hydraulic actuator to the inside of the tank l. Piping is provided so that it can be freely connected outside the tank.

Reference numeral 14 denotes a suction pipe connected to the suction portion 15 of the hydraulic pump 5, and the tip thereof is opened on the downstream side of the electric motor 5 in the flow path 3B. 16 is a strainer for filtering the working fluid, and is provided at the tip of the suction pipe 14.

Next, the operation of this configuration will be explained.

The joint block member l0111 is connected to the hydraulic actuator via supply piping and return piping (not shown).

When the hydraulic pump 5 is driven by energizing the electric motor 4 from this state, the working fluid stored in the tank 1 is sucked in from the strainer 16 through the suction pipe 14 and transferred from the hydraulic pump 5 to the flexible pipe 1.
2 to the joint block member 10.

The hydraulic actuator operates in response to this discharged hydraulic fluid, and the hydraulic fluid discharged from the hydraulic actuator flows from the joint block member 11 through the return path member 13 and returns to the inside of the tank 1. At this time, since the electric motor 4 and hydraulic pump 5 are immersed in the hydraulic fluid, their operating noise is attenuated by the hydraulic fluid, and the partition plate 2 and flexible tube 12 direct the operating noise to the side plate of the tank l. Coupled with the attenuation of the propagation, the device operates in very quiet conditions.

Due to this operation, the working fluid flowing back into the tank l from the return path member 13 flows through the flow path from 3A to 3B, and is sucked and discharged by the hydraulic pump 5 from the strainer I6 again. Therefore, a flow of hydraulic fluid is actively created in the flow paths 3A and 3B, and the hydraulic fluid flows around the outer periphery of the casing 4A to the electric motor 4 disposed in the flow path 3B, and a portion of the hydraulic fluid also flows. It flows into the casing 4A through the hole 4E, flows between the stator 4B and the rotor 40 and through the flow path 4G, and flows into the flow hole 4D.
More leakage. Since the heat of the electric motor 4 is dissipated by the working fluid flowing inside and outside the casing 4A, and the electric motor 4 is efficiently cooled, its output can be effectively used up to a permissible value. Therefore, the operating efficiency of the entire device can be improved.

Furthermore, by improving the cooling effect of the electric motor 4, it is possible to downsize the electric motor 4 and reduce the capacity of the tank 1, and the structure is also different from the conventional one, with flow passages 3A and 3B for allowing the flow of working fluid inside the tank 1. Since only a single partition plate 2 is required to form the structure, it is possible to obtain a device that is small in size and easy to handle.

〔Effect of the invention〕

As described above, according to the configuration of the present invention, a flow of hydraulic fluid is actively created in the flow path formed inside the tank by driving the hydraulic pump by energizing the electric motor, and the hydraulic fluid flowing through this flow path drives the electric motor. Since it is cooled inside and outside the casing and temperature rise is prevented, the output of the electric motor can be used effectively and the operating efficiency of the entire device can be improved. In addition, by improving the cooling effect of the motor, it is possible to downsize the motor and reduce the tank capacity, and compared to the conventional structure, the motor has a single flow path that allows the working fluid to flow inside the tank. By just providing a partition plate, it is possible to obtain a device that is small in size, lightweight, and easy to handle.

[Brief explanation of drawings]

FIGS. 1 and 3 show an embodiment of the hydraulic pressure source device according to the present invention, and FIG. is a cross-sectional view along line IF-I in FIG. 1,
FIG. 3 is an enlarged view showing the main parts of the electric motor cut away. 1... Tank 2... Partition plate 3A, 3B... Flow path 4... Electric motor, 4D, 4E... Distribution hole 5... Hydraulic pump 13... Return path member 15... Suction Department

Claims (1)

[Claims] A single partition plate is arranged vertically on the bottom plate inside the tank that stores the hydraulic fluid to form a flow path for the hydraulic fluid, and an electric motor and an electric motor drive are installed in this flow path along the flow direction of the hydraulic fluid. A hydraulic pump is immersed in the hydraulic fluid, and a return path member through which the hydraulic fluid discharged by the hydraulic pump and returned to the tank is connected to the suction section of the hydraulic pump in the flow path at both ends of the motor. The electric motor is characterized by having communication holes at both ends of the casing that guide the hydraulic fluid flowing through the flow path so that the stator and rotor inside the casing are immersed in the hydraulic fluid. Hydraulic pressure source device.