ORBITING MEMBER FLUID DISPLACEMENT APPARATUS WITH ROTATION PREVENTING MECHANISM

摘要

The present invention discloses a reliable rotation preventing/thrust bearing device for use in an orbiting member fluid displacement apparatus. The rotation preventing/thrust bearing device includes a discrete fixed portion, a discrete o rbital portion, and bearing elements. The fixed portion includes a first annular race a nd a first ring, both of which are formed separately. The first annular race is placed in a loose fit surrounding a first annular step in an inner surface of the housing and the first ring is attached to the housing. The orbital portion includes a second annular race a nd a second ring, both of which are formed separately. The second annular race is pla ced in a loose fit surrounding a second annular step in an end plate of the orbiting member and the second ring is attached to the end plate of the orbiting member. A plura lity of pockets of the rings face one another in generally aligned pairs. A bearing elem ent is received in each aligned pair of pockets to prevent the rotation of the orbiting member by the bearing elements interacting with the first and second rings and to carry the axial thrust load from the orbiting member. The first and second annular anti-weal pla tes are overlaid surrounding the first and second annular races, respectively. The f irst and second annular anti-wear plates are fixedly placed within the first and second a nnular steps respectively in order to prevent the circumferential and radial movement t hereof.