To provide a structure that can positively prevent mutual rubbing between a part of the outer peripheral surface of a cage 7b and the inner peripheral surface of an outer ring even when a radial ball bearing is operated at high speed rotation in high temperature environment.
A reinforcing ring 12a is connected and fixed to the axial other face of a main part 9a of the cage 7b, and the outer peripheral surface of the main part 9a and elastic pieces 10a, 10a is formed as an inclined surface 18 inclining in a radially inward direction toward one side in an axial direction. Consequently, even when the radial ball bearing is operated at high speed rotation of 1,400,000 dmn or more, mutual rubbing between a part of the outer peripheral surface of the cage 7b and the inner peripheral surface of the outer ring can be prevented.
Takashi Daejeon
Kinzo Koyama