Abstract: A rolling bearing includes an outer raceway, an inner raceway, a plurality of rolling elements interposed between the outer raceway and the inner raceway, and a cage for holding the rolling elements away from each other at the same interval in a rolling direction of the rolling elements, the cage including a first layer subjected to a surface treatment of at least one of carbonitriding, phosphating, sulfonitriding and gas soft nitfriding, and a second layer formed of at least one of PTFE, MoS.sub.2, WS.sub.2, Ag and Sn when the first layer includes a treated surface subjected to the surface treatment of phosphating. The rolling bearing can stabilize the attitude of the rolling elements and retain the ease of grinding them. At the same time, the dynamic torque of the rolling elements can be minimized while insuring to prevent the rolling elements from falling away from the cage.

Abstract: A plastic holder for a rolling bearing is made of linear-chain polyphenylene sulfide resin, preferably with glass fiber reinforcement.

Abstract: A rolling bearing comprising an outer race having one track, an inner race having the other track, a plurality of rolling elements arranged between the both tracks, and a cage for retaining the plurality of rolling elements in such a way that the rolling elements can roll freely, wherein the cage is a lubricating oil-containing polymer member obtained by molding a synthetic resin containing 10 to 80% by weight of a lubricating oil. The cage retains a sufficient amount of a lubricating oil at a high rate of retention so that a lubricating action can be maintained in a stable manner for a prolonged period of time, and it is produced at low cost.

Abstract: A linear bearing is constructed of a shaft having a cylindrical outer wall, an outer race having a cylindrical inner peripheral wall, a cylindrical retainer inserted for axial displacement within a toroidal space between the outer wall and the inner wall, and plural balls retained for rotation in the retainer and in contact with the outer wall and the inner wall. The balls are provided more densely at axially opposite end portions of the retainer.