Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1996-10-22
1998-04-14
Wright, Dirk
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
477906, F16H 6104, F16H 6108
Patent
active
057386021
ABSTRACT:
A system for controlling oil pressure of an automatic vehicle transmission having a plurality of fictional engaging elements (K1 ,K2,K3,B 1 ,B2) installed in the transmission for establishing a gear, a plurality of solenoid valves (SA and SE) at least one (SA) of which opens to supply the pressurized oil to at least one (K1) of the frictional engaging elements. The system also as a manual valve (20) whose spool moves in response to the selection of the selector lever for supplying the pressurized oil to the frictional engaging element bypassing the solenoid valve when the shift lever selects another gear range (1) in case of solenoid valve failure, and an underdrive engage control valve (30, 96) placed between the frictional engaging element and the switching valve for regulating pressure of the pressurized oil to be supplied to the frictional engaging. element in response to the pressurized oil outputted from the solenoid valve. In the system the underdrive engage control valve regulates the pressure of the pressurized oil to be supplied to the frictional engaging element in response to the pressurized oil supplied from the switching valve.
REFERENCES:
patent: 4995285 (1991-02-01), Hayakawa et al.
patent: 5014577 (1991-05-01), Takada et al.
patent: 5083481 (1992-01-01), Smith et al.
patent: 5337625 (1994-08-01), Jang
patent: 5399130 (1995-03-01), Long
patent: 5445578 (1995-08-01), Koenig et al.
patent: 5509868 (1996-04-01), Eaton
Morita Yukio
Niiyama Tsunefumi
Honda Giken Kogyo Kabushiki Kaisha
Wright Dirk
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