Angular ball bearing

An angular ball bearing, comprising:

• an inner ring comprising an inner ring raceway surface on an outer circumferential surface thereof;
• an outer ring disposed on an outer side than the inner ring, the outer ring comprising an outer ring raceway surface on an inner circumferential surface thereof;
• a plurality of rolling elements disposed between the inner ring raceway surface and the outer ring raceway surface, the rolling elements each contacting the inner ring raceway surface and the outer ring raceway surface at positions at which an angle of contact is made with a radial direction;
• and
• a cage disposed between the inner ring raceway surface and the outer ring raceway surface, the cage serving to retain the plurality of rolling elements in a manner that the plurality of rolling elements are annularly arranged and circumferentially spaced at intervals, the cage comprising a plurality of pockets in which the plurality of rolling elements are retainable, the pockets being circumferentially spaced at intervals,
• the cage being asymmetrical to a straight line extending in the radial direction,
• a value of α being defined as 30°≤α≤45°, where the α is the angle of contact of the rolling element,
• the relationship defined in the following numerical expression (1) is satisfied,
• [
• Numerical
• ⁢
• Expression
• ⁢
• 1
• ]
• 
• 0.62
• ≤
• 2
• ⁢
• D
• a
• D
• -
• d
• ≤
• 0.8
• (
• 1
• )
• where D is an outer diameter of the outer ring, d is an inner diameter of the inner ring, and Da is a diameter of the rolling element,
• with center axes of a whole bearing in an axial direction and of the cage in the axial direction overlapping each other, at least one of the following relationships is satisfied;
• A/Da≤0.020 (2), and
• 2A/PCD≤0.010 (3),
• where A is a smallest dimension value of a clearance in the radial direction between surfaces of the pocket of the cage facing the rolling element and of the rolling element, and PCD is a pitch diameter of each of the plurality of rolling elements.