Hydraulic control system for an automatic transmission having an

Details Hydraulic control system for an automatic transmission having an Hydraulic control system for an automatic transmission having an

1992-12-11

1994-11-29

Bonck, Rodney H.

Machine element or mechanism

Gearing

With fluid drive

475123, F16H 4700

Patent

active

053679229

ABSTRACT:
An R-N-D control valve of a hydraulic control system is disclosed which ensures the prevention of shock that may occur at the time of an "N-R" and an "N-D" manual shift, by unifying a shift control pressure with one valve in the case of an "N-R" shift and an "N-D" shift and first-second speed shift. The present invention discloses that a line pressure generated from a manual valve is changed to a control pressure controlled by the proportional control of a linear valve, and transmitted to each clutch and brake according to the movement position of a spool of a valve by the line pressure.

REFERENCES:
patent: 4501174 (1985-02-01), Sugano
patent: 4829853 (1989-05-01), Sakaguchi
patent: 4850251 (1989-07-01), Kuwayama et al.
patent: 4889016 (1989-12-01), Kuwayama et al.
patent: 5005444 (1991-04-01), Kimura et al.
patent: 5224399 (1993-07-01), Baba et al.

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