Patent ID: 6371653
Filing Date: 2002-04-16
Classification: F16C

Abstract:
An anti-frictional bearing comprising:an inner raceway formed on an outer peripheral surface of an inner race, an outer raceway formed on an inner peripheral surface of an outer race, and a plurality of rotating bodies interposed between the inner and outer raceways and retained by retainers in a predetermined distance with each other, the inner and outer raceway surfaces having unilateral amplitude waviness per unit along a corresponding circumference, wherein an out of roundness of the raceway surface of at least one of said inner and outer race is equal to or less than 0.05 &mgr;m, and the unilateral amplitude waviness values of the numbers of crests of (aZ) and (aZÂ±1) on its raceway surface per unit along the corresponding circumference are equal to or less than 0.001 &mgr;m, which reduces a non-repeatable runout such that a harmonic analysis on the raceway surface is not necessary in manufacturing the anti-frictional bearing, wherein a is a positive integer and Z is the number of rotating bodies.