Angular ball bearing
AssigneeNsk Ltd.
InventorsShuji Soga, Yoshiaki Katsuno
Life of this patent
Estimating the term…
Abstract
A groove curvature radius ratio Ri of the inner ring raceway groove to a ball diameter is 54% to 58%, a groove curvature radius ratio Ro of an outer ring raceway groove of an outer ring to the ball diameter is 51% to 58%, and Ri−Ro≥0 points. At least an inner ring raceway groove of an inner ring has a maximum surface pressure of 4.7 GPa to 6.0 GPa when a sum of permanent deformation amounts of the ball and the inner ring raceway groove at a center of a contact portion between a ball of an angular ball bearing and the inner ring raceway groove is 1/10,000 of the ball diameter. Accordingly, it is possible to provide the angular ball bearing that can reduce the heat generation amount, and that can reduce the damage caused by the external impact load in the stationary state.
Claims9
An angular ball bearing comprising:
- an inner ring that has an inner ring raceway groove having an arc-shaped cross section on an outer peripheral surface of the inner ring;
- an outer ring that has an outer ring raceway groove having an arc-shaped cross section on an inner peripheral surface of the outer ring;
- and
- a plurality of balls rollably provided between the inner ring raceway groove and the outer ring raceway groove,
- wherein a groove curvature radius ratio (Ri) of the inner ring raceway groove to a ball diameter is 54% to 58%, a groove curvature radius ratio (Ro) of the outer ring raceway groove to the ball diameter is 51% to 58%, and Ri−Ro≥0, and
- wherein at least the inner ring raceway groove includes a cured surface layer having a maximum surface pressure of 4.7 GPa to 6.0 GPa, the maximum surface pressure being a pressure at which a sum of permanent deformation amounts of the ball and the inner ring raceway groove at a center of a contact portion between the ball and the inner ring raceway groove is 1/10,000 of the ball diameter, the cured surface layer being formed by a surface curing processing.
Dependencies are inferred from the claim text.