Fluid pressure control device for an automatic transmission in a

Details Fluid pressure control device for an automatic transmission in a Fluid pressure control device for an automatic transmission in a

1993-05-14

1995-01-10

Pitts, Andrea L.

192 clutches and power-stop control

Clutches

Operators

192 85AA, F16D 2514

Patent

active

053798740

ABSTRACT:
A fluid pressure control device is equipped with a valve body which has an input port connected to a hydraulic fluid source, an output port which is connected to a pressure chamber of a clutch of an automatic transmission, and a discharge port. It further includes a solenoid valve which is incorporated in the valve body and has a valve spool designed to selectively connect the output port to the input port or the discharge port. A discharge passage extends from the discharge port of the valve body, the discharge passage having a discharge port which is positioned at a higher level than the liquid level of the oil pan of the automatic transmission. Finally, a reed valve acts to close the discharge port of the discharge passage to maintain fluid at the aforementioned higher level, and allows the discharge of the hydraulic fluid only through the discharge port.

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patent: 5137049 (1992-08-01), Orlowski
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