| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a structure that can secure sealing property of openings at both axial ends of a bearing space 7 with rolling elements 5, 5 installed without providing a seal ring, and moreover can reduce an axial dimension by a portion of not providing the seal ring. <P>SOLUTION: Both inner and outer peripheral edge parts of rim parts 15, 15 of cages 14, 14 are provided with inner diameter side and outer diameter side collar parts 16, 17 over the whole periphery in a projecting state toward the outer peripheral surface of an inner ring 4 and toward the inner peripheral surface of an outer ring 2. Both inner and outer peripheral surfaces of these inner diameter side and outer diameter side collar parts 16, 17 are brought close to face the outer peripheral surface of the inner ring 4 and the inner peripheral surface of the outer ring 2 which face the inner and outer peripheral surfaces. In this case, the sizes ti, to of clearances between both inner and outer peripheral surfaces of the inner diameter side and outer diameter side collar parts 16, 17, and the outer peripheral surface of the inner ring 4 and the inner peripheral surface of the outer ring 2 are regulated to the same extent as clearances set between the tip edge of the seal ring and a mating surface and required to secure sealing performance, assuming that the non-contact seal ring is provided in an opening of a bearing space 7 over the whole periphery. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
