An angular ball bearing, comprising:
- an inner ring comprising an inner ring raceway surface on an outer circumferential surface thereof;
- an outer ring comprising an outer ring raceway surface on an inner circumferential surface thereof such that the outer ring raceway surface of the outer ring and the inner ring raceway surface of the inner ring face each other;
- 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 is satisfied:
- 0.62
- ≤
- 2
-
- D
- a
- D
- -
- d
- ≤
- 0.8
- 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;
- and
- 2A/PCD≤0.010,
- 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 the plurality of rolling elements, wherein
- the inner ring comprises:
- a first counter-bored portion;
- and
- a first shoulder portion bulging toward the outer ring as compared with the first counter-bored portion,
- the outer ring comprises:
- a second counter-bored portion;
- and
- a second shoulder portion bulging toward the inner ring as compared with the second counter-bored portion,
- the cage comprises:
- a first annular portion disposed between the first counter-bored portion and the second shoulder portion;
- a second annular portion disposed between the second counter-bored portion and the first shoulder portion;
- and
- a pillar portion interposed between the plurality of rolling elements circumferentially arranged next to each other,
- the pillar portion comprises:
- an inner diameter pillar portion extending from the first annular portion toward the second annular portion along the axial direction;
- and
- an outer diameter pillar portion extending from the second annular portion toward the first annular portion along the axial direction,
- a side of the inner diameter pillar portion closest to the outer ring and a side of the outer diameter pillar portion closest to the inner ring are connected to form the pillar portion in which the inner diameter pillar portion and the outer diameter pillar portion are integral with each other,
- the outer diameter pillar portion comprises a second axial side surface on a side closer to the first annular portion than the second annular portion, the second axial side surface being a surface inclined in both of the radial direction and the axial direction and reaching the first annular portion or the inner diameter pillar portion, and
- the second axial side surface is a combination of two or more surfaces, and an angle made by at least part of these surfaces of the second axial side surface with the axial direction is less than 20° or more than 40°.