Patent ID: 7435006

Claim:
A bearing for pulley of engine auxiliary, comprising: an outer ring having an outer diameter of 65 mm or less and a plurality of rows of outer raceway grooves provided on an inner surface thereof; an inner ring having two rows of inner raceway grooves provided on an outer surface thereof; a plurality of balls having a diameter of 4 mm or less disposed between said plurality of rows of inner raceway grooves of said inner ring and said plurality of rows of outer raceway grooves of said outer ring, respectively; a retainer retaining said plurality of balls and a seal sealing the interior of the bearing; wherein at least one of said inner ring and said outer ring is fixed to a member having a larger linear expansion coefficient than that of the bearing material; a width dimension of the bearing is 45% or less of the inner diameter dimension of the bearing; and a thickness of the bottom of at least one of said inner ring and outer ring is 50% or more of the diameter of the balls.