Fail-safe hydraulic control for a forward clutch in a continuous

Details Fail-safe hydraulic control for a forward clutch in a continuous Fail-safe hydraulic control for a forward clutch in a continuous

1988-12-28

1990-07-10

Diehl, Dwight

Machine element or mechanism

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

Preselected indexed position

74568, B60K 4112

Patent

active

049399586

ABSTRACT:
A hydraulic pressure control system for a transmission comprises a pressure reduction valve which regulates fluid supply to an output hydraulic fluid line from an input hydraulic fluid line and fluid discharge from the output hydraulic fluid line to a drain hydraulic fluid line. In order to assure an inflow of hydraulic fluid to the output hydraulic fluid line, there is provided an orifice connected between the input hydraulic fluid line and the output hydraulic fluid line. A relief valve is provided at the drain hydraulic fluid line to restrain discharge of hydraulic fluid from the drain hydraulic fluid line. Thus even if the pressure reduction valve is sticked, there remains hydraulic fluid pressure in the output hydraulic fluid line.

REFERENCES:
patent: 2693711 (1954-11-01), Kelbel et al.
patent: 2733732 (1956-02-01), Baker, Jr.
patent: 2929267 (1960-03-01), Wilson
patent: 3699994 (1972-10-01), Mohri
patent: 4735113 (1988-04-01), Yamamuro et al.

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