Patent ID: 6832903
Filing Date: 2004-12-21
Classification: F04C,Y10T

Abstract:
A rotary fluid pressure device of the type including a housing having a fluid inlet port and a fluid outlet port; the housing having an internally-toothed ring member, and an externally-toothed star member eccentrically disposed within said ring member for relative orbital and rotational movement therebetween to define a plurality of expanding and contracting fluid volume chambers in response to said orbital and rotational movements, and minimum and maximum volume transition chambers; a valve member cooperating with said housing to provide fluid communication between said inlet port and said expanding volume chambers and between said contracting volume chambers and said outlet port; an output shaft and drive shaft for transmitting said rotational movement from said star member to said output shaft; said valve member and said housing cooperating to define a nominal valve overlap; said device being characterized by:the valve member having an axially movable spool valve rotatably mounted in the said housing to cause the way that fluid is communicated between the inlet and outlet ports of the device and the volume chambers thereof wherein a valve actuator comprising a spring loaded plunger controlled by fluid pressure at the inlet and outlet ports is in physical contact with one end of the spool valve.