Patent ID: 6554479
Filing Date: 2003-04-29
Classification: F16C,Y10T

Abstract:
A ball bearing comprising;an inner ring having an outer peripheral surface formed with an inner ring raceway thereon, an outer ring having an inner peripheral surface formed with an outer ring raceway thereon, the outer ring raceway having an inner diameter, a cage made of synthetic resin and rotatably disposed relative to the inner ring and outer ring and having a plurality of pockets formed therein, and a plurality of balls held in the pockets, respectively, to be rotatably disposed between the inner ring raceway and outer ring raceway, wherein in the state before the cage is disposed between the inner ring and the outer ring, and where the balls held in the pockets are displaced toward the radially inside of the cage until the rolling contact surface of the balls comes in contact with the inner surface of the respective pockets to produce a circumscribed circle with a diameter with respect to the balls, the diameter of the circumscribed circle is smaller than the inner diameter of the outer ring raceway by an amount in the range of 10 &mgr;m to 60 &mgr;m.