Seal assemblies, gaskets, bearing assemblies, and their components can be used as pre-packaged seal systems and pre-packaged seal and bearing systems. The seal assemblies can be orientated in different configurations for different applications. Gaskets or washers to restrict flow and gaskets or washers with memory lips to operate as sealing lips can be included to increase the number of sealing points. In a pre-packaged configuration, the cylinder can be a straight cylinder, a stepped cylinder, or a split cylinder. Bearing assemblies can be pre-packaged with the sealing assemblies and service grease may optionally be used to provide lubrication and limit fluid incursion into the spring cavities.

A bearing includes an inner ring and an outer ring arranged to face each other with a rolling element interposed therebetween, and a housing including a housing inner supported by the inner ring and a rotor flange supported by the outer ring. The rotor flange includes a flange portion extending toward one end surface side in an axial direction of the outer ring, and a C-type retaining ring arranged at the other end surface side in the axial direction of the outer ring. A push ring formed of a resin material is provided in a gap between the flange portion and the one end surface in the axial direction.

A bearing includes an inner ring and an outer ring arranged to face each other with a rolling element interposed therebetween, and a housing including a housing inner supported by the inner ring and a rotor flange supported by the outer ring. The rotor flange includes a pair of C-type retaining rings respectively arranged at one end surface side in an axial direction of the outer ring and at the other end surface side in the axial direction of the outer ring, groove portions extending in a circumferential direction and in which the pair of C-type retaining rings is respectively mounted, and first gap sealing members formed of a resin material and arranged in gaps between the C-type retaining rings and the respective end surfaces in the axial direction of the bearing, and gaps between the C-type retaining rings and the groove portions.

The present invention is intended to provide a protective cover having a reliable sensor holder part that prevents reduction in air tightness and strength of a division wall between a magnetic sensor and a magnetic encoder.

A protective cover 1 is press-fitted into an outer ring to seal one axial end portion of a bearing, and has a sensor holder part 3B holding a magnetic sensor A. In the protective cover 1, a disc-shaped member 3 has a thick part 6 as a flow path for preferentially charging a molten resin into a thin part for forming a division wall B in a cavity of a molding die for use in injection molding between a position corresponding to a gate of the molding die and the division wall B.