Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1997-08-15
1999-03-16
Wright, Dirk
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
477152, F16H 6106
Patent
active
058822739
ABSTRACT:
A hydraulic control system for an automatic transmission used in a vehicle, the hydraulic control system includes a pressure regulating part for regulating hydraulic pressure generated from a hydraulic pump to constant line pressure, a manual valve selectively supplying hydraulic pressure to a drive pressure passage, a reverse pressure passage, and a first and a second speed pressure passage. A pressure control part supplies standard pressure to solenoid valves which are duty-controlled by a transmission control unit. The pressure control part has a solenoid supply valve. A damper clutch control part controls a damper clutch of a torque converter. A pressure distributing part distributes an appropriate amount of pressure to friction members, and has shift valves and clutch valves. A torque pressure generating part reduces the line pressure so that it can be used for initial shifting control. A pressure compensating device compensates hydraulic pressure by elastically storing the standard pressure when the hydraulic pressure fed to the torque pressure generating part, the pressure regulating part, and the damper clutch control part is reduced, the pressure compensating device being connected to the pressure control part.
REFERENCES:
patent: 3656372 (1972-04-01), Chana
patent: 4987982 (1991-01-01), Yamaguchi
patent: 5393273 (1995-02-01), Haka
Hyundai Motor Company
Wright Dirk
LandOfFree
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