JPH0488201A - Oil pressure source device - Google Patents

Abstract

PURPOSE:To realize sufficient cooling of an electric motor with a simple structure by forming a meandering flow passage in a tank by means of partition plates, providing flow ports for introducing a working liquid inside tank on both end portions of a motor casing, and providing an intake and a return portions respectively outside both the partition plates. CONSTITUTION:Partition plates 12A, 12B, one side ends of which are fixed respectively to side plates 1B, 1C and the other side ends are open so as to form a meandering flow passage, are provided in a tank 1 and a motor 2 submerged in a working liquid drives a hydraulic pump 3. Flow ports 2D, 2E for introducing the working liquid are provided in a casing 2A of the motor 2, wherein a stator 2B and a rotor 2C are housed, and an intake portion 14 of the hydraulic pump 3 is arranged in a flow passage 13C while a return pipe thereof in a flow passage 13A. Accordingly, the motor 2 is arranged in a flow of the working liquid so that it is cooled efficiently and operated silently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hydraulic power source device in which an electric motor and a hydraulic pump driven by the electric motor are immersed in a tank of working fluid, and particularly relates to improvements in cooling the electric motor.

[Conventional technology]

Conventionally, this type of hydraulic source device is disclosed in Japanese Patent Application Laid-open No. 1-188701.
As shown in FIG. 5 of the publication, the electric motor and the hydraulic pump are integrally connected and suspended from the upper plate of the tank and immersed in the hydraulic fluid, and the electric motor is provided so as to be cooled 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, resulting in a temperature rise above the allowable level. There was a problem that the output of the electric motor was limited.

The present invention aims to solve these problems, and provides a hydraulic pressure source device that can effectively cool the motor with hydraulic fluid by creating a flow of hydraulic fluid around the motor. It is.

[Means for solving problems]

Therefore, in the present invention, an electric motor and a hydraulic pump driven by the electric motor are housed in a rectangular parallelepiped tank for storing hydraulic fluid, with their axes aligned along the longitudinal direction of the tank, and immersed in the hydraulic fluid. Distribution holes are provided at both ends of the casing to guide the working fluid in the tank so that the stator and rotor inside the casing are immersed in the working fluid, and the tank is partitioned along the length of the tank on both sides of the motor. The inner area of each partition plate in the tank where the electric motor is arranged communicates with the outer area of each partition plate on opposite sides in the longitudinal direction of the tank, so that a meandering flow path is created from the part to the tank. The hydraulic fluid to be returned is provided to flow into the outside area of the other partition plate in the tank.

[For production]

In the hydraulic pressure source device of the present invention configured as described above, the working fluid in the area outside one partition plate in the tank is sucked in from the suction point of the hydraulic pump, and returned from the outside to the other partition plate in the tank. The working flow flowing into the outer area of the plate flows in a meandering flow path from the outer area of the other partition plate through the inner area of each partition plate to the outer area of one partition plate. . Since the electric motor is placed in this flow path, the hydraulic fluid flows around the electric motor while removing heat from the electric motor.

Therefore, the hydraulic fluid around the electric motor does not stagnate there but flows, and the electric motor is well cooled by the hydraulic fluid.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

In FIGS. 1 to 4 showing an embodiment of the present invention,
1 is a tank, with a bottom plate IA and four side plates 1B around the bottom plate IA.
11C1ID, IE and side plate IB.

1C1ID, has a top plate IF placed on the top end of the IE, is rectangular in plan view and front view, and has a bottom plate IA facing the center;
It is formed into a box shape that is inclined downward and has a rectangular parallelepiped shape as a whole, and stores the working fluid inside (the liquid level is indicated by L). 2
3 is a hydraulic pump which is driven by the electric motor 2 and sucks and discharges working fluid, and both are integrally connected and attached to a pedestal 4. The pedestal 4 has a mounting frame section 4A on the upper side, and the mounting frame section 4A is placed on the anti-vibration rubber 6 supported by the metal fittings 5, and the receivers fixed to the side plates ID and IE are fixed with nuts 7 to connect the motor 2. and a hydraulic pump 3 are housed in the tank 1 with their axes aligned along the longitudinal direction of the tank 1 and immersed in the hydraulic fluid.

As shown in detail in FIG. 4, the electric motor 2 has a casing 2A with a space accommodating a stator 2B and a rotor 2C, and a tank is installed at both ends of the casing 2A so that the stator 2B and rotor 2C are immersed therein. Flow holes 2D and 2E are provided to guide the hydraulic fluid in the casing 2A into the casing 2A. Note that 2F is a coil of the stator 2B, and 2G is a circulation groove, and the hydraulic fluid led into the casing 2A from one of the circulation holes 2D flows between the stator 2B and the rotor 2C and through the circulation groove 2G. It is possible to flow out of the casing 2A from the other communication hole 2E.

Reference numerals 8 and 9 indicate joint blocks provided on the upper plate IF. The joint block 8 connects a flexible pipe 10 extending from the discharge part 3A of the hydraulic pump 3 within the tank 1, and guides the discharge liquid of the hydraulic pump 3 guided by the flexible pipe 10 to the outside (as shown in the figure). In addition, the joint block 9 connects a return pipe (not shown) outside the tank 1 so that the hydraulic fluid returned from the outside can be connected to the return pipe 11 connected inside the tank 1. 12A and 12B are partition plates attached to the frame 4 with screws 13 on both sides of the electric motor 2 and hydraulic pump 3. Each partition plate 12A and 12B is connected to the tank 1 in the longitudinal direction. is arranged along the bottom plate lA and extends above the liquid level, and the partition plate 1
2A is in contact with the side plate IB, and the partition plate 12B is in contact with the side plate IC.

The inner area of each partition plate 12A, 12B in the tank 1, where the electric motor 2 and hydraulic pump 3 are arranged, is communicated with the outer area of the partition plate 12A on the side plate IC side, and also communicates with the outer area of the partition plate 12B. Meandering flow paths 13A, 113B, and 13C are formed in the tank 1, communicating with each other on the side plate IE side. and,
A return pipe 11 is provided in the flow path 13A in the outer area of the partition plate 12A.
A return port 11A is arranged, an electric motor 2 and a hydraulic pump 3 are arranged in a flow path 13B in the inner area of each partition plate 12A and 12B, and a hydraulic pressure A strainer 14 serving as a suction point for the pump 3 is arranged. Note that the strainer 14 has a suction pipe 15 that passes through the partition plate 12B and is connected to the suction portion 3B of the hydraulic pump 3.
attached to the tip of the

Next, the operation of this configuration will be explained.

Supply piping and return piping (not shown) connected to the coupling block 8.9 are connected to a hydraulic actuator via a control valve or the like, as is well known. When the electric motor 2 energizes the coil 2F to rotate the rotor 2C and drive the hydraulic pump 3, the working fluid in the tank 1 is sucked through the strainer 14 and flows through the flexible tube 1.
The hydraulic actuator receives this discharged hydraulic fluid and operates. The hydraulic fluid returned from the hydraulic actuator flows from the return pipe into the tank 1 through the return pipe 1-1. At this time, since the electric motor 2 and the hydraulic pump 3 are immersed in the hydraulic fluid, their operating noise is attenuated by the hydraulic fluid. Coupled with the fact that the propagation of the operating noise is blocked and attenuated, the hydraulic pump 3 can be driven very quietly.

Then, the hydraulic fluid 2 flowing into the tank 1 from the return port 11A of the return pipe 11 is transferred to the flow path 13A because the hydraulic fluid in the flow path 13C is sucked into the hydraulic pump 3 from the strainer 14.
, 13B, and 13C, and reaches the strainer 14 where it is sucked. The hydraulic fluid then flows through the flow path 13.
A part of the flow flows around the electric motor 2 placed in the inside B, and a part of it flows into the casing 2A of the electric motor 2 through the communication hole 2D, and flows through the communication hole 2 between the rotor 2C and the stator 2B and through the communication groove 2G.
It flows out from E and flows inside and outside of the motor 2, removing heat from the motor 2 and cooling the motor 2.

Therefore, the working fluid inside and outside the electric motor 2 flows without stagnation there, so that the electric motor 2 is efficiently cooled.

〔Effect of the invention〕

In this way, in the present invention, since the electric motor is disposed in the flow path formed by the partition plate, in which the working fluid returned from the outside and flows into the tank flows to the suction point of the hydraulic pump, the electric motor The working fluid around the motor flows without stagnation there, and the motor is cooled well. Furthermore, since the working fluid flowing through the flow path can flow in and out of the flow path inside the casing of the electric motor without causing stagnation, the electric motor can be cooled better from the inside and outside.

Since this flow of hydraulic fluid is created by the suction action of the hydraulic pump, it can be obtained with a simple configuration without the need for a special power source, and the partition plates installed on both sides of the motor reduce the operating noise of the motor. It has features such as being able to attenuate and block propagation, and in addition to the fact that the operating noise of the motor and hydraulic pump is attenuated by the hydraulic fluid in which they are immersed, an extremely quiet hydraulic source device can be obtained. .

[Brief explanation of drawings]

The drawings show one embodiment of the hydraulic pressure source device according to the present invention, in which FIG. 1 is a longitudinal sectional view taken along line 1-1 in FIG. 2, and FIG.
A cross-sectional view taken along the line I-■ in the figure, Figure 3 is a cross-sectional view taken along the line ■-■ in Figure 1.
FIG. 4 is a longitudinal cross-sectional view taken along line (2) and an enlarged view showing the main parts of the electric motor cut away. 1--tank, 2--motor, 2A--casing, 2B-m-stator, 2C-m-rotor, 2D12E
-m-flow hole, 3--1 hydraulic pump, 11-11 return pipe, 12A, 12B-m=partition plate, 13A, 13B, 13
C--One flow path, 14--One suction point.

Claims (1)

[Claims] An electric motor and a hydraulic pump driven by the electric motor are housed in a rectangular parallelepiped tank that stores hydraulic fluid, with their axes aligned along the longitudinal direction of the tank and immersed in the hydraulic fluid.The motor is connected to a stator inside the casing. Distribution holes are provided at both ends of the casing to guide the working fluid in the tank so that the rotor is immersed in the working fluid, and partition plates are provided inside the tank along the longitudinal direction of the tank on both sides of the motor. A meandering flow path is formed in the tank by connecting the inner area of each partition plate where the electric motor is arranged with the outer area of each partition plate on opposite sides in the longitudinal direction of the tank. The suction point of the pump is arranged in the outer area of one partition plate in the tank, and the working fluid returned from the outside is provided to flow into the outer area of the other partition plate in the tank. Hydraulic pressure source device.