The artificial defective attaching bearing ring which it lays out as artificial defect in order the artificial defective attaching bearing ring and

摘要

PROBLEM TO BE SOLVED: To improve reliability of a lifetime test related to an internal start point type separation.;SOLUTION: A bearing ring is constructed so that a hole 3a penetrating a part of an inner ring 4 in a shaft direction is formed with electric discharge machining. Then, the intermediate part of this hole 3a arranged under the surface of an inner ring orbit 5 is made work as an artificial defect. At this time, the internal start point type separation is generated by controlling the formation position of the hole 3a to the inner ring 4 and the internal diameter thereof.;COPYRIGHT: (C)2005,JPO&NCIPI