Power plants – Pressure fluid source and motor – Having a mechanical clutch or brake device in the power train
Patent
1988-06-27
1990-01-09
Look, Edward K.
Power plants
Pressure fluid source and motor
Having a mechanical clutch or brake device in the power train
60441, 60442, 91447, F16D 3102
Patent
active
048919420
ABSTRACT:
A hydraulically powered actuator (16) for moving a member (28 or 30) into and away from a position at which the member is under a preload is disclosed. A hydraulically powered motor (22) is utilized which is coupled to the member for moving the member to and from the position at which the member is preloaded. A source (40) of pressurized hydraulic fluid is coupled to the hydraulic motor for supplying power to the motor for moving the movable member. A brake (32) is provided which is coupled to the movable member for holding the movable member in the position at which the member is preloaded. A hydraulic fluid control is provided which is coupled to the motor, the brake and the source of pressurized fluid which activates the brake after the motor has moved the member to the position at which the member is preloaded and deactivates the motor while maintaining the member under preload. The invention eliminates the build-up of heat in hydraulic fluid consequent from the prior art method of establishing preload by applying full hydraulic power to the hydraulic motor to hold the member under preload and further is not subject to leakage which is consequent from maintaining a hydraulic motor under full hydraulic pressure. Finally, the invention permits a rapid response in removing the preload from the movable member by merely applying high pressure hydraulic fluid to the hydraulic line of the motor which will cause it to rotate in the opposite direction that the motor rotated in establishing the preload.
REFERENCES:
patent: 3601235 (1971-08-01), Huf
patent: 3696895 (1972-10-01), Schaffer
patent: 3717992 (1973-02-01), Eyles
patent: 3988893 (1976-11-01), Bojas et al.
patent: 4317331 (1982-03-01), Aruga et al.
patent: 4495767 (1985-01-01), Aliyama et al.
patent: 4644849 (1987-02-01), Tanaka
Look Edward K.
Sundstrand Corporation
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