Line pressure control arrangement for automatic transmission

Details Line pressure control arrangement for automatic transmission Line pressure control arrangement for automatic transmission

1988-10-31

1990-11-27

Bonck, Rodney H.

Machine element or mechanism

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

Preselected indexed position

74867, F16H 5914, F16H 5970

Patent

active

049727397

ABSTRACT:
A second spool valve element which is engageable with the one which actually controls discharging of hydraulic fluid in a manner which controls the level of the line pressure, has first and second lands, the first and second lands defining a pressure differential area which can be exposed to a first control pressure indicative of the transmission being shifted out of D range into a lower one, in a manner to bias the second valve toward the first spool valve element; a chamber is defined in the valve bore to which the engageable ends of the first and second spools are exposed and which is supplied with a second control pressure indicative of the torque being applied to the tranmission, the second control pressure producing a bias which tends to move the the first and second spool valve elements apart.

REFERENCES:
patent: 3738198 (1973-06-01), Kell
patent: 3840039 (1974-10-01), Shellman
patent: 3893472 (1975-07-01), Schuster
patent: 4139015 (1979-02-01), Sakai
patent: 4462280 (1984-07-01), Sugano et al.
patent: 4506564 (1985-03-01), Coutant
patent: 4534243 (1985-08-01), Yokoyama et al.
patent: 4672862 (1987-06-01), Chama

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