Manual transmission control

Details Manual transmission control Manual transmission control

1993-12-03

1995-10-03

Marmor, Charles A.

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

475134, 475135, F15B 13044

Patent

active

054547644

ABSTRACT:
A transmission has a manual selector valve which is reciprocally and rotatably mounted in a valve body and operable in a conventional "H" shift pattern to permit selection of first through fifth forward drive conditions, a neutral condition and a reverse drive condition in a planetary transmission. The selector valve has a line pressure chamber formed thereon that remains in fluid communication with a line feed passage in the valve body throughout the "H" pattern. This line pressure chamber is selectively alignable with respective clutch and brake apply passages formed in the valve body to control the flow of pressurized oil for the engagement of respective clutches and brakes. A plurality of exhaust chambers formed therein are also selectively connectible with the clutch and brake apply passages to control disengagement of the respective clutches and brakes not required for the selected drive condition.

REFERENCES:
patent: 4754666 (1988-07-01), Inagaki
patent: 4779512 (1988-10-01), Leonard
patent: 5113725 (1992-05-01), Tomomatsu et al.

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