Rotary valve for automatic transmission

Details Rotary valve for automatic transmission Rotary valve for automatic transmission

1993-11-22

1994-09-27

Luong, Vinh T.

192 clutches and power-stop control

Clutches

Operators

192 8719, 13762523, 25112911, F16D 2510

Patent

active

053500474

ABSTRACT:
An oil passage is provided in an axially central portion of a spool which is received within a valve housing and rotatively driven by a pulse motor, and oil passages passed diametrically through the spool and connected to the oil passage, so that a hydraulic pressure from an input port connected to a hydraulic pressure source is selectively supplied to the oil passages for selectively engaging and disengaging frictionally engaging elements of an automatic transmission. An axially acting load provided by the hydraulic pressure is received by a thrust bearing mounted at an end of the spool. The supply of oil from the axial portion of the spool enables no side force to be applied, thereby reducing the frictional force and to enhance the sealability between the valve housing and the spool.

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European Search Report.

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