Hydraulically controllable transmission

Details Hydraulically controllable transmission Hydraulically controllable transmission

1990-07-20

1992-06-02

Bonck, Rodney H.

192 clutches and power-stop control

Transmission control and clutch control

Common control

192109F, B60K 4122, F16D 2514

Patent

active

051179539

ABSTRACT:
A hydraulically operable transmission comprises a hydraulic clutch, a change speed control valve, change speed actuators controllable by the control valve, a pilot oil line for varying pressure states in response to operation of the actuators, an oil supply line extending to the hydraulic clutch, a clutch control valve operable with a pilot pressure applied from the pilot oil line to close the oil supply line, and a pressure buildup device mounted on the oil supply line. The pressure buildup device includes an oil chamber for producing predetermined pressure increase characteristics with a pilot pressure applied from the oil supply line and a spring load, a drain line extending from the oil chamber, and a drain control valve mounted on the drain line for opening and closing the drain line in response to the pilot pressure applied from the pilot oil line.

REFERENCES:
patent: 3990553 (1976-11-01), Holzinger et al.
patent: 4560047 (1985-12-01), McCarthy et al.
patent: 4711329 (1987-12-01), Hasegawa et al.
patent: 4877116 (1989-10-01), Horsch

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