VORRICHTUNG MIT KREISENDEM KOLBEN ZUM FOERDERN VON FLUIDEN MIT EINER EINRICHTUNG ZUM VERHINDERN DER ROTATION.

摘要

The present invention discloses a durable rotation preventing/thrust bearing device (37) for use in an orbiting member fluid displacement apparatus. The rotation preventing/thrust bearing device (37) includes a discrete fixed portion, a discrete orbital portion and bearing elements. The fixed portion includes a first race (371) and first ring (372) both of which are formed separately. The first (371) race is placed in a first groove (113) in an inner surface of the housing and the first ring (372) is attached to the housing. The orbital portion includes a second race (374) and second ring (375) both of which are formed separately. The second race (374) is placed in a second groove (274) in an end plate of the orbiting member and the second ring (375) is attached to the end plate of the orbiting member. A plurality of pockets (372a, 375a) are formed axially in the rings toward the respective races. The pockets of the rings face one another in generally aligned pairs. A bearing element (377) 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 races are placed within the first and second annular grooves respectively in order to be able to circumferentially and radially move within a restricted range.