Control and actuation system for hydraulically actuated clutch a

Details Control and actuation system for hydraulically actuated clutch a Control and actuation system for hydraulically actuated clutch a

1992-08-31

1993-10-05

Braun, Leslie A.

192 clutches and power-stop control

Clutch and brake

Peripheral brake

192 12C, F16D 6704

Patent

active

052496554

ABSTRACT:
Two solenoid-actuated shuttle valves selectively direct hydraulic fluid from a line pressure source to a clutch and brake servo or direct fluid from the clutch and servo to a low pressure drain, in accordance with the combined states of the solenoids. The system includes several orifices, which in combination control the rate of flow between the pressure source and the friction elements. The orifices control also the flow rate in the system between the friction elements and drain ports. Accumulators are located in the system between the shuttle valves and the friction elements. An arrangement of check valves and orifices located between the shuttle valves and the accumulators establish the rate of flow between each of the accumulators and the associated friction element.

REFERENCES:
patent: 3550735 (1970-12-01), Olsen
patent: 4336869 (1982-06-01), Tsutsumi
patent: 4407399 (1983-10-01), Wolff
patent: 4549640 (1985-10-01), Sekino
patent: 4774857 (1988-10-01), Heine et al.
patent: 5058717 (1991-10-01), Haglund
Toyota Lexus 1990 Repair Manual, vol. 1, p. AT-95.

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