ROLLING BEARING FOR EXTREMELY LOW TEMPERATURE ENVIRONMENTS

摘要

Provided is a rolling bearing for extremely low temperature environments that comprises a deep groove ball bearing (A) provided with a retainer (4) made from a fluororesin molded body, wherein the retainer (4) is obtained by a plurality of separator-type retainer pieces (5) that divide, in the circumferential direction, the retainer (4) having a ring-shaped main portion being integrally connected to an annular bearing-side plate (6) by anchoring with screws (7), and the retainer piece (5) is provided with a linear projection (5a), which projects toward a raceway face (2a) on the inner circumferential side of an outer ring (2) and extends along the circumferential direction of the retainer piece (5), at a height that allows contact with the raceway face. Because the projection (5a) provided on the retainer piece (5) can contact the raceway face (2a), the fluororesin efficiently lubricates the raceway face (2a) by being transferred via a ball (3).