Patent ID: 6062835
Filing Date: 2000-05-16
Classification: F04C

Abstract:
A rotary fluid pressure device of the type including housing means defining a fluid inlet port and a fluid outlet port; a rotary fluid displacement mechanism including an internally-toothed ring member and an externally-toothed star member eccentrically disposed within said ring member for orbital movement therein, one of said ring member and said star member having rotational movement, and said star member defining a central opening; the teeth of said ring member and said star member interengaging to define expanding and contracting fluid volume chambers in response to said orbital and rotational movements; valve means cooperating with said housing means to provide fluid communication from said inlet port to said expanding volume chambers, and from said contracting volume chambers to said outlet port; shaft means and means operable to transmit torque from said member having said rotational movement to said shaft means; and an endcap assembly disposed rearwardly of, and immediately adjacent, said fluid displacement mechanism; characterized by:(a) said endcap assembly defining an internal chamber;(b) a lock piston disposed in said internal chamber, and including a lock portion extending forwardly of said lock piston;(c) said lock piston being moveable between a first, retracted position, and a second position in which said lock portion extends within said central opening of said star member to prevent said orbital movement of said star member.