| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a bearing for a two-wheeled vehicle reduction gear capable of obtaining resistance to grease leakage and a space saving property at low cost and at the same time. <P>SOLUTION: A retainer 4 has pockets 50 respectively holding a plurality of balls at a plurality of positions in a circumferential direction. About an inner surface of each pocket 50, a part of an inner diameter side of a ball array pitch circle PCD is a ring shape having a recessed curved surface of which diameter becomes shorter as becoming closer to an open edge of an inner diameter side of the retainer. A recessed part 54 extending from the open edge of the inner diameter side of the retainer to an outer diameter side of the retainer is provided in the inner surface of each pocket 50. A film composed of either of resin, soft metal or a solid lubricant may be formed in guiding surfaces of balls in the pockets 50 of the retainer 4. <P>COPYRIGHT: (C)2009,JPO&INPIT |
