Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1995-10-13
1997-07-01
Marmor, Charles A.
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
475120, 475122, F16H 6106
Patent
active
056431252
ABSTRACT:
Power transmissions incorporate gear ratios including a plurality of forward ratios, a neutral condition and at least one reverse ratio. The establishment of each ratio is controlled by selectively engageable hydraulically operated friction devices, such as clutches and brakes. The interchange between forward ratios is controlled by the interchange of at least one friction device. The control elements to accomplish the establishment and interchange of the ratios include a pressure source, shift valve, solenoid control valves and pressure control valves. The solenoid valves are electrically actuated and the hydraulic portion of the control includes elements that permit continued operation of the transmission in selected ratios in the event of electrical discontinuance. Also provided within the hydraulic control is a pressure knockdown or pressure reducing valve element which operates with one of the shift valves to establish a maximum pressure level in the forward ratios that is less than the maximum pressure level in the reverse ratio.
REFERENCES:
patent: 3660976 (1972-05-01), Canale
patent: 3868868 (1975-03-01), Chana
patent: 4309917 (1982-01-01), Leet
patent: 5342253 (1994-08-01), Mizobe et al.
patent: 5376056 (1994-12-01), Wakahara et al.
patent: 5382201 (1995-01-01), Iizuka
Cole Jeffrey Jay
Long Charles Francis
McCauley Phillip Franklin
General Motors Corporation
Kwon Peter T.
Marmor Charles A.
Scherer Donald F.
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