Hydraulic pressure control for automatic transmission

Details Hydraulic pressure control for automatic transmission Hydraulic pressure control for automatic transmission

1993-11-09

1995-01-24

Wright, Dirk

Machine element or mechanism

Gearing

With fluid drive

747301, 192 328, F16H 6114

Patent

active

053833791

ABSTRACT:
A hydraulic pressure control apparatus for an automatic transmission includes brakes and clutches to be engaged for selectively establishing gear positions in response to a controlling hydraulic pressure from a hydraulic pressure source. Two solenoid-operated valve assemblies are disposed in a hydraulic passage between the hydraulic pressure source and the brakes and clutches. The solenoid-operated valve assemblies are independently operable in response to respective control signals for controlling the supply of the controlling hydraulic pressure from the hydraulic pressure source to the brakes and clutches.

REFERENCES:
patent: 4345489 (1982-08-01), Muller et al.
patent: 4395927 (1983-08-01), Muller et al.
patent: 4729461 (1988-03-01), Nishikawa et al.
patent: 4875391 (1989-10-01), Leising et al.
patent: 4989702 (1991-02-01), Yoshimura et al.
patent: 5010990 (1991-04-01), Yoshimura et al.
patent: 5060769 (1991-10-01), Yoshimura et al.

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