JP3359704B2 - Hydraulic pressure source device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention 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 contained in a hydraulic fluid in a tank. The present invention relates to a hydraulic pressure source device in which a pipe is connected to a hole, and a discharge hole of the pipe is disposed near a hydraulic fluid return path member to cool the hydraulic fluid and settle refuse to reflux.

[0002]

2. Description of the Related Art FIG. 3 is a top view showing a configuration of a conventional hydraulic pressure source device, and FIG. 4 is a half sectional view showing a schematic configuration of a motor used in the conventional hydraulic pressure source device.
In the figure, 1 is a tank for storing the hydraulic fluid of the hydraulic pressure source device, 2 is a partition plate for partially dividing the tank 1, 3 is an electric motor,
4 is a hydraulic pump driven by the electric motor 3, 5 is a suction part of the hydraulic pump 4, 6 is a discharge part of the hydraulic pump 4, 7 is a return path member for hydraulic fluid, 8 is a load side bracket of the electric motor 3, 9
Is an anti-load side bracket, 10 is a stator, 11 is a stator coil, 12 is a rotor, 13 is a shaft, 14 and 15 are bearings, 16 is a working fluid inflow hole, and 17 is provided on the back of the stator 10. A hydraulic fluid circulation hole, 18 is a hydraulic fluid outflow hole, and 21 is a frame of the electric motor 3. 22 is a magnet.

Next, the operation will be described. When the hydraulic pump 4 is driven by the electric motor 3, the hydraulic fluid is sucked from the suction unit 5 and discharged from the discharge unit 6 to operate a hydraulic actuator (not shown). And the return path member 7
Is returned to tank 1. The returned hydraulic fluid is supplied to the partition plate 2
And is again sucked from the suction part 5 of the hydraulic pump 4 to form a flow of the hydraulic fluid. Incidentally, the electric motor used in the liquid as described above is disclosed in Japanese Patent Application Laid-Open No. 60-162433.
It is disclosed in Japanese Patent Application Laid-Open No. 4-22437.

Since the motor 3 is installed along the flow of the hydraulic fluid, the hydraulic fluid flows around the outer periphery of the frame 21 of the motor 3, and the hydraulic fluid is guided into the motor 3 through the inlet 16. The working fluid guided into the electric motor 3 is subjected to the action of centrifugal force by the rotating rotor 12. For example, the working fluid in contact with the rotor 12 moves out of the center of rotation along the side wall of the rotor 12. The centrifugal force is applied toward, and it flows outward from the center of rotation. Then, the hydraulic fluid flows out to the load side bracket 8 side of the hydraulic pump 4 through the flow hole 17. The hydraulic fluid is guided to the outside of the electric motor 3 from the outflow hole 18, and the hydraulic fluid cools the stator 10 and the rotor 12 of the electric motor 3. When the hydraulic pressure source device operates, the level of the hydraulic fluid is always above the upper surface of the electric motor 3. Further, metal dust in the working fluid is adsorbed by the magnet 22.

[0005]

However, in the conventional hydraulic pressure source device as described above, the hydraulic fluid flowing out of the electric motor is immediately sucked from the suction portion of the hydraulic pump. At this time, the working fluid flowing out of the motor has a higher temperature than the surrounding working fluid to cool the motor. In addition, the working fluid contains dust and the like that are wound up by centrifugal force received from the rotor. Therefore, when the working fluid containing dust and the like at such a high temperature is sucked from the hydraulic pump, the service life of the hydraulic pump, the hydraulic actuator, and the working fluid itself is shortened.
There is a problem that the reliability of the device is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and has been made to reduce the life of a hydraulic pump, a hydraulic actuator, and a hydraulic fluid by cooling the hydraulic fluid and reducing the amount of dust contained in the hydraulic fluid. An object of the present invention is to obtain a hydraulic power source device that is extended and has high reliability.

[0007]

In order to achieve the above object, a hydraulic pressure source device according to the present invention includes a tank for storing a hydraulic fluid, and a hydraulic pump driven by an electric motor. A flow of the working fluid is formed in the tank from a return path member that flows the working fluid that is discharged from the pressure pump and returns to the tank, to a suction part of the hydraulic pump,
In the hydraulic pressure source device in which the electric motor and the hydraulic pump are immersed in the hydraulic fluid in the tank and the electric motor is arranged along the flow of the hydraulic fluid, the hydraulic fluid is guided into the casing of the electric motor, An inflow hole for immersing the stator and the rotor in the casing in the hydraulic fluid is opened toward the upstream side of the casing, and flows out from the inflow hole and guides out the hydraulic fluid by centrifugal force of the rotor. Opening a hole in the casing downstream of the inflow hole,
A pipe through which the hydraulic fluid flows is connected to the outflow hole, and a discharge hole of the pipe is arranged near the return path member.

[0008]

With the hydraulic pressure source device according to the present invention, the temperature is raised by passing through the inside of the electric motor, and the hydraulic fluid containing dust and the like is guided to the vicinity of the hydraulic fluid return path member of the tank and flows out. Recirculate the inside of the tank again to the suction port of the hydraulic pump, promote cooling of the working fluid and settling of the garbage contained in the working fluid, and prevent the working fluid containing the garbage containing the dust at high temperature directly from the pump suction part. Bring to reflux.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a top view showing the configuration of the hydraulic pressure source device according to the present invention. In the figure, 1 is a tank for storing the hydraulic fluid, 2 is a partition plate for partially dividing the tank 1, 3
Is an electric motor (see FIG. 2), 4 is a hydraulic pump driven by the electric motor 3, 5 is a suction part of the hydraulic pump 4, and 6 is a hydraulic pump 4.
, A return member 7 for the working fluid, and 20 a flexible tube for guiding the fluid that has passed through the inside of the electric motor 3.

FIG. 2 is a half sectional view showing a schematic structure of the electric motor according to the present invention. In the figure, 8 is a hydraulic pump 4
Are connected to the load side bracket for supporting the side surface of the motor 3, 9 is provided on the opposite side of the load side bracket 8, the anti-load side bracket for supporting the side surface of the motor 3, 10 is the stator, and 11 is the stator coil , 12 is a rotor, 13 is a shaft on which the rotor 12 is mounted, and 14 and 15 are shafts 13.
Bearings for rotatably supporting each end of the hydraulic fluid, 16 an inflow hole for hydraulic fluid, 17 a hydraulic fluid flow hole provided on the back of the stator 10,
Reference numeral 19 denotes a working fluid outflow hole, 20 denotes a flexible tube connected to the outflow hole 19, and 21 denotes a frame of the electric motor 3.

Next, the operation will be described. When the hydraulic pump 4 is driven by the electric motor 3, the hydraulic fluid is sucked from the suction unit 5 and discharged from the discharge unit 6 to operate a hydraulic actuator or the like (not shown). Then, the hydraulic fluid is discharged from the return path member 7 to the tank 1. The discharged hydraulic fluid bypasses the partition plate 2 and flows again.
And the flow of the hydraulic fluid is formed.

Since the electric motor 3 is installed along the flow of the hydraulic fluid, the hydraulic fluid flows around the outer periphery of the frame 21 of the electric motor 3, and the hydraulic fluid is guided into the electric motor 3 from the inflow hole 16. The working fluid guided into the electric motor 3 is subjected to the action of centrifugal force by the rotating rotor 12. For example, the working fluid in contact with the rotor 12 moves out of the center of rotation along the side wall of the rotor 12. The centrifugal force is applied toward, and it flows outward from the center of rotation.

The hydraulic fluid flows out through the flow hole 17 to the load-side bracket 8 on the hydraulic pump 4 side. In addition, it flows out to the load side bracket 8 side of the hydraulic pump 4 through the gap between the rotor 12 and the stator 10. This hydraulic fluid is guided to the flexible tube 20 through the outflow hole 19 and discharged to the vicinity of the return path member 7. The motor 3
The stator 10 and the rotor 12 are cooled. When the hydraulic pressure source device operates, the flow surface of the hydraulic fluid must be
Above the top.

Therefore, as described above, the working fluid that has passed through the inside of the electric motor 3 is discharged to the vicinity of the return path member 7, so that the working fluid having a high temperature and containing dust and the like is subjected to the hydraulic pressure. There is no longer any direct suction from the pump 4.
As a result, the hydraulic fluid that has passed through the inside of the electric motor 3 goes around the tank 1 to the suction port of the hydraulic pump 4, so that the cooling of the hydraulic fluid and the settling of the contained dust are promoted, and the hydraulic pump 4 and the hydraulic actuator ( The life of the working fluid itself is prolonged, and a highly reliable hydraulic pressure source device can be obtained. Further, since the provision of the forced cooling device for the hydraulic fluid is not required or the load on the cooling device can be greatly reduced, a low-cost hydraulic pressure source device can be obtained.

[0015]

As described above, according to the hydraulic pressure source device of the present invention, the working fluid which passes through the inside of the electric motor, is heated to a high temperature, and contains dirt and the like is returned to the working fluid return passage of the tank. By guiding it to the vicinity of the component and flowing out, it makes a round of the inside of the tank again to the suction port of the hydraulic pump to promote cooling of the working fluid and settling of dust contained in the working fluid. Since the configuration is such that the contained hydraulic fluid is recirculated so as not to be sucked, the life of the hydraulic pump, the hydraulic actuator, and the hydraulic fluid is extended, and the reliability of the device is improved.

[Brief description of the drawings]

FIG. 1 is a top view showing a configuration of a hydraulic pressure source device according to the present invention.

FIG. 2 is a half sectional view showing a schematic configuration of the electric motor shown in FIG.

FIG. 3 is a top view showing a configuration of a conventional hydraulic pressure source device.

FIG. 4 is a half sectional view showing a schematic configuration of the electric motor shown in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank 3 Electric motor 4 Hydraulic pump 5 Suction part 6 Discharge part 7 Return path member 10 Stator 12 Rotor 16 Inflow hole 19 Outflow hole 20 Flexible tube

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshio Morikawa 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Co., Ltd. Inside the company (72) Inventor Tetsuichi Mukai 45, Hachiji-cho, Okazaki-shi, Aichi Pref.Toyoko Kogyo Co., Ltd. (72) Inventor Michio Nakamoto 5-1-1, Yata Minami, Higashi-ku, Nagoya City Mitsubishi Electric Corporation Nagoya Works (56) References JP-A-4-165101 (JP, A) JP-A-4-140501 (JP, A) JP-A-4-88201 (JP, A) JP-A-4-22237 (JP, A) A) JP-A-4-354786 (JP, A) JP-A-60-162433 (JP, A) JP-A-5-1001 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) F15B 1/00 F15B 21/04 F04D 13/08 H02K 9/19

Claims (1)

(57) [Claims] A hydraulic pump driven by an electric motor, wherein the hydraulic fluid is discharged from the hydraulic pump and flows back to the tank through a return path member. A flow of the working fluid to a suction part of a pump is formed in the tank, and the motor and the hydraulic pump are immersed in the working fluid in the tank, and the motor is arranged along the flow of the working fluid. In the hydraulic pressure source device, the working fluid is guided into the casing of the electric motor, and an inflow hole for immersing the stator and the rotor in the casing in the working fluid is opened toward the upstream side of the casing, An outlet hole that flows in from the inlet hole and guides the working fluid by the centrifugal force of the rotor is opened in the casing downstream of the inlet hole, and a pipe through which the working fluid flows is connected to the outlet hole, A hydraulic pressure source device, wherein a discharge hole of the pipe is arranged near the return path member.