Patent ID: 8449195
Filing Date: 2013-05-28
Classification: F16C

Abstract:
1. A retainer of a ball bearing comprising a main body having a circular annular shape, and plural circular pockets that extend through the main body in a radial direction for retaining balls therein, wherein intermediate parts between adjacent pockets in an inner circumferential surface of the main body define recesses for holding grease, wherein the recesses are formed at the inner circumferential surface of the main body so as to pass partly through the main body, the recesses each are formed into a substantially square shape when viewed from the inner circumferential surface, the substantially square shape being closed at a first side facing an outer edge of the inner circumferential surface, and the substantially square shaped recesses each have an opening projecting from another side of each of the recesses, the projecting opening extending toward a center line of the inner circumferential surface of the main body, and wherein a composite material is used for the main body, thereby enabling a grease base oil to permeate therethrough, wherein the composite material is a cloth-containing phenol resin.