Hydraulic control apparatus for automatic transmissions

Details Hydraulic control apparatus for automatic transmissions Hydraulic control apparatus for automatic transmissions

1990-03-30

1992-02-04

Herrmann, Allan D.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

13762569, 192 4A, F15C 302

Patent

active

050851020

ABSTRACT:
A hydraulic control apparatus for an automatic transmission having a mechanical parking mechanism includes a manual valve disposed in the hydraulic control apparatus and having a parking (P) position, reverse (R) position, neutral (N) position and at least one forward speed position. The manual valve is provided with a drain port for releasing, in the parking position, the hydraulic pressure of a hydraulic circuit which establishes the reverse range, and the drain port is provided with an orifice which limits the discharge rate of hydraulic pressure.

REFERENCES:
patent: 3707891 (1973-01-01), Asano et al.
patent: 3990549 (1976-11-01), Sisson et al.
patent: 4726262 (1988-02-01), Hayakawa et al.
patent: 4827807 (1989-05-01), Hayakawa et al.

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