Automatic transmission having hydraulic servo device for band br

Details Automatic transmission having hydraulic servo device for band br Automatic transmission having hydraulic servo device for band br

1992-01-14

1993-02-23

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

475146, 188 77R, F16H 344

Patent

active

051885700

ABSTRACT:
An automatic transmission has a low clutch and a band brake. The band brake is actuated by a hydraulic servo device. In order to establish well timed operations of the low clutch and the band brake upon shifting from third gear to fourth gear, both the release of the low clutch and engagement of the band brake are effected by discharging a hydraulic pressure through a common oil passage from the low clutch and one of the oil chambers of the servo device.

REFERENCES:
patent: 2890603 (1959-06-01), Harris et al.
patent: 2901888 (1959-09-01), Swift
patent: 3538791 (1970-11-01), Asano et al.
patent: 4224837 (1980-09-01), Croswhite

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