Hydraulic control system for automatic transmissions

Details Hydraulic control system for automatic transmissions Hydraulic control system for automatic transmissions

1996-06-06

1997-11-25

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

F16H 6106

Patent

active

056905742

ABSTRACT:
A pressure regulating portion having a pressure regulating valve regulates hydraulic pressure fed from a hydraulic pump and a shift control part having a manual valve and a shift control valve feeds hydraulic pressure fed from the pressure regulating portion in response to each shift mode. A pressure control portion controls hydraulic pressure to be proper to each shift mode. The pressure control part includes first and second pressure control solenoid valves, and first and second pressure control valves and an N-R control valve. A pressure dispensing part dispenses hydraulic pressure fed from the shift control part and the pressure control part to first, second, third, fourth and fifth friction members. A switch valve feeds selectively hydraulic pressure fed from the second pressure control valve to the first and fourth friction members. A pressure damping member is disposed on a line connected to the third friction member which is applied in third and fourth speeds of a drive "D" range. A first release pressure retarding member is disposed on a release pressure line of the fifth friction member and a second release pressure retarding member is disposed on a line connecting the first pressure control valve to the first-to-second speed shift valve.

REFERENCES:
patent: 4616531 (1986-10-01), Ogasawara et al.
patent: 4724727 (1988-02-01), Shibayama et al.
patent: 4807496 (1989-02-01), Hayasaki et al.
patent: 4982622 (1991-01-01), Yamamoto et al.
patent: 5305665 (1994-04-01), Sano et al.
patent: 5342253 (1994-08-01), Mizobe et al.
patent: 5385511 (1995-01-01), Iizuka

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