Automatic transmission having centrifugally operable drain valve

Details Automatic transmission having centrifugally operable drain valve Automatic transmission having centrifugally operable drain valve

1987-12-01

1989-06-20

Braun, Leslie A.

192 clutches and power-stop control

Clutches

Operators

192 85AA, 91442, F16D 2512

Patent

active

048402613

ABSTRACT:
A hydraulic actuator for hydraulically actuating a clutch mechanism to selectively engage a clutch drum and a planetary gear unit of an automatic transmission is disclosed, which comprises a chamber defined by the clutch drum; a piston operatively disposed in the chamber to form a fluid work chamber; a drain valve including a drain bore formed in the piston having one end exposed to the fluid work chamber and a valve ball movably disposed in the drain bore in such a manner that when the fluid work chamber is filled with a pressurized fluid, the ball closes the drain bore; and a flow straightening structure exposed to the fluid work chamber and formed on at least one of the piston and a bottom of the fluid work chamber in order to suppress formation of vortex flow near a mouth of the drain bore.

REFERENCES:
patent: 2740512 (1956-04-01), Fischer
patent: 3378111 (1968-04-01), Greer et al.
patent: 3647037 (1972-03-01), Toma
patent: 3724626 (1973-04-01), Claus, Jr. et al.
patent: 4509627 (1985-04-01), Kawamoto

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