Fluid handling – Pressure modulating relays or followers – With counter-balancing pressure feedback to the modulating...
Patent
1973-05-02
1976-06-22
Wyche, Benjamin W.
Fluid handling
Pressure modulating relays or followers
With counter-balancing pressure feedback to the modulating...
192109F, 192113B, H01M 436, F16D 2500
Patent
active
039645061
ABSTRACT:
A system for controlling pressure of a fluid, specifically the pressure of servo oil delivered to a clutch which determines the torque transmitted by the clutch. The system includes a pump, a pressure regulating valve to provide servo oil at constant pressure from the pump, and a pilot valve controlled by a solenoid responsive to electric current to vary the pressure in a pilot fluid line supplied from the constant pressure line. The oil is delivered from the fixed pressure line to the clutch by a throttling flow control servo valve which can open for rapid filling of the clutch cylinder. This valve is biased to close by the delivered pressure and biased to open by the pilot pressure. It may also be biased to close by a spring, and in this case be restrained from completely closing, so that the valve assumes its minimum area when the delivered pressure is slightly less than the pilot pressure. The clutch supply line is connected to the pump inlet through a by-pass servo valve which opens when the delivered pressure exceeds the pilot pressure, thus equalizing the delivered pressure with the pilot pressure. This valve also provides for rapid emptying of the clutch cylinder.
REFERENCES:
patent: 2984218 (1961-05-01), Christianson
patent: 3561367 (1971-02-01), Black
patent: 3621955 (1971-11-01), Black
Fitzpatrick Paul
General Motors Corporation
Wyche Benjamin W.
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