| 摘要 |
PROBLEM TO BE SOLVED: To relieve deformation force and frictional force acting on a cage, to prevent damage of the cage, and to restrain bearing temperature rise by relatively forming at least a single recessed part to a circular locus of a transfer surface of an inner race. SOLUTION: A transfer surface 5 for guiding a rolling body 4 from the inside is arranged in an inner race 1, and a transfer surface 6 for guiding the rolling body 4 from the outside is arranged in an outer race 2. Three recessed parts 7 having the depth of severalμm and the length of about several mm are formed at an equal angle on the transfer surface 5 of the inner race 1. Since a preload acting on the rolling body 4 is reduced or wholly eliminated in a position corresponding to the recessed parts 7, friction of the rolling body 4 and the inner race transfer surface 5 is reduced. Since a slide to the bearing center side of the rolling body 4 is allowed before deformation of a cage 3 becomes large, excessive deformation force and frictional force do not act on the cage 3 to thereby prevent damage of the cage 3 as well as to restrain a rise in a bearing temperature.
|
