Hydraulic control system of an automatic transmission used in a

Details Hydraulic control system of an automatic transmission used in a Hydraulic control system of an automatic transmission used in a

1995-11-08

1997-05-06

Marmor, Charles A.

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

475128, 477130, 477150, F16H 5900

Patent

active

056265336

ABSTRACT:
A hydraulic control system of an automatic transmission, which includes a line pressure regulator for regulating the hydraulic pressure supplied from an oil pump to the hydraulic control line, and a shift structure for selectively delivering the regulated hydraulic pressure to the friction elements, wherein the shift structure further comprises a manual valve operatively linked with a shift lever for delivering the regulated hydraulic pressure according to shift ranges, a plurality of solenoid valves controlled on/off by a transmission control unit to control the friction elements, a first to a fifth pressure control valves for simultaneously controlling both releasing and connecting end of the friction elements, a first-to-second shift valve for making a port change by the hydraulic pressure flowing out from the pressure control valves to deliver the pressure to the friction elements, a forward drive clutch release valve, a second-to-third shift valve, and a reverse drive clutch valve.

REFERENCES:
patent: 4870877 (1989-10-01), Hasegawa et al.
patent: 5366420 (1994-11-01), Kuriyama et al.
patent: 5507706 (1996-04-01), Jang et al.

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