Transmission fluid pressure control device with two stepped line

Details Transmission fluid pressure control device with two stepped line Transmission fluid pressure control device with two stepped line

1980-10-03

1983-06-21

Bonck, Rodney H.

Machine element or mechanism

Gearing

Plural power paths to and/or from gearing

74752A, 74867, F16H 564, B60K 4104

Patent

active

043888445

ABSTRACT:
A hydraulic fluid pressure control system for a transmission which is shifted between two speed stages via a hydraulic actuator. A line pressure regulation valve receives supply of fluid pressure from a pump and produces a regulated line pressure. A switching valve receives supply of this regulated line pressure and selectively supplies it as an operating pressure to the fluid actuator, according to the opening and closing of a pilot port. This operating pressure is also supplied to the line pressure regulation valve for increasing the regulated value of the line pressure when the fluid actuator is being operated.

REFERENCES:
patent: 3085449 (1963-04-01), De Corte et al.
patent: 3241399 (1966-03-01), Fisher et al.
patent: 3625322 (1971-12-01), Nagamatsu et al.
patent: 3714836 (1973-02-01), Pierce et al.
patent: 3738193 (1973-06-01), Sumiyoshi et al.
patent: 4314488 (1982-02-01), Lauven

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