Power plants – Pressure fluid source and motor – Input pump and rotary output motor system having...
Patent
1997-09-05
1999-07-27
Nguyen, Hoang
Power plants
Pressure fluid source and motor
Input pump and rotary output motor system having...
60488, F16D 3900
Patent
active
059270730
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an electric hydraulic hybrid motor, and particularly to an electric hydraulic motor which houses a hydraulic pump driven by an electric motor, and a hydraulic motor, which outputs torque by receiving oil pressure from the hydraulic pump, positioned inside the electric motor.
BACKGROUND ART
Conventionally, it is known that a hydraulic pump, driven by an electric motor, and a hydraulic motor, outputting torque by receiving pressurized oil from the hydraulic pump, can be provided integrally with the electric motor (for example, Japanese Patent Application Publication (B1) 53-37523). According to the Japanese Patent Application Publication (B1) 53-37523, the hydraulic variable speed electric motor is provided with a rotor, which is located inwardly of the stator of the electric motor, and a hollow shaft, which is located inwardly of the rotor and which is hollow with both ends being supported by bearings. The hollow shaft is electrically driven integrally with the rotor, and is used as an input shaft for the power of the hydraulic pump. A projecting shaft, which is integral with the outside case for the stator and rotor of the electric motor is fixedly provided at the hollow shaft. The hydraulic pump is provided in the direction of the outer diameter of the projecting shaft and axially adjacent to the stator and the rotor of the electric motor. The hollow shaft and the projecting shaft, provided fixedly and integrally with the hollow shaft, are supported by the bearings at three points. The hydraulic motor is provided inside the hollow shaft so as to oppose the hydraulic pump. The pressurized oil from the hydraulic pump goes to the external case of the electric motor, from the hydraulic pump through the rotating hollow shaft and the integrated projecting shaft and is further sent from the external case to the hydraulic motor.
However, in the above-described conventional hydraulic variable speed electric motor, the hydraulic pump is placed axially adjacent to the stator and the rotor of the electric motor; therefore, the length of the hydraulic variable speed electric motor is great. In addition, the pressurized oil from the hydraulic pump is sent through the rotating hollow shaft and the integrated projecting shaft to the external case, and is sent from the external case to the hydraulic motor; therefore, the hydraulic variable speed electric motor similarly has the great length. Further, the hollow shaft and the integrated projecting shaft are supported by the bearings at three points, making the center shaft core difficult to access, and a large clearance between the external case and the rotating integrated projecting shaft is necessary. For this reason, there is a disadvantage of increased leakage of the pressurized oil from the clearance.
SUMMARY OF THE INVENTION
The present invention is made in order to eliminate the disadvantages of the above-described conventional art, and its object is to provide an electric hydraulic hybrid motor, which is designed to be small in size by housing a hydraulic pump and a hydraulic motor in the electric motor, and which has excellent performance.
The electric hydraulic hybrid motor relating to the present invention is an electric hydraulic hybrid motor which includes an electric motor, a hydraulic pump driven by the electric motor, and a hydraulic motor driven by the hydraulic pump, with the hydraulic pump or the hydraulic motor being placed inwardly of the rotor of the electric motor, and is characterized: by the hydraulic pump being placed inwardly of the stator of the electric motor and the hydraulic motor being placed inwardly of the rotor; by the hydraulic pump including, a cylinder block for the pump and a plunger for the pump which are rotated integrally with the rotor; and by the hydraulic motor including a cylinder block for the hydraulic motor and a plunger for the hydraulic motor.
The electric hydraulic hybrid motor can suitably include a port block, which supplies and discharges oil, between the cylinder
REFERENCES:
patent: 5228290 (1993-07-01), Speggiorin
patent: 5259194 (1993-11-01), Okada
Ishizaki Naoki
Uehara Kazuo
Yamaguchi Hiromasa
Komatsu Ltd.
Nguyen Hoang
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