Patent ID: 9188111
Filing Date: 2015-11-17
Classification: F01B,F04B

Abstract:
1. A variable displacement assembly for a fluid device, the variable displacement assembly comprising: a rotor; a plurality of reciprocating members in engagement with the rotor, each of the reciprocating members having an axial end having a first portion and a second portion; a ring assembly defining a cam surface in engagement with the reciprocating members, the ring assembly having a first ring and an axially adjacent second ring, at least one of the first and second rings being adapted for selective movement relative to the other between a neutral position and a displaced position, the first ring having a first ring portion defining a bore having an inner surface, the second ring having a second ring portion defining a bore having an inner surface, wherein the first portion of the axial end of each reciprocating member acts against the inner surface of the first ring portion and the second portion of the axial end of the reciprocating member acts against the inner surface of the second ring portion, wherein the cam surface is defined by an intersection of the first ring portion and the second ring portion, and wherein a first circumferential portion of the inner surface of the first ring portion and a second circumferential portion of the inner surface of the second ring portion define the cam surface in the displaced position.