| 摘要 |
Construction of a double-row tapered-roller bearing unit that is able to improve the contact state between the rolling contact surfaces of plural tapered rollers and a first inner-ring raceway (7) and second inner-ring raceway (8), and a method of manufacturing the same are provided. The inclination angle ¸ 1 of the first inner-ring raceway (7) and the inclination angle ¸ 2 of the second inner-ring raceway (8) in a state before the first inner ring (10) and the second inner ring (11) are press-fitted onto the fitting surface section (13a) of the hub main body (12a), the amount of decrease ´¸ a in the inclination angle of the first inner-ring raceway (7) and the amount of decrease ´¸ b in the inclination angle of the second inner-ring raceway (8) occurring due to press-fitting of the first inner ring (10) and the second inner ring (11) onto the fitting-surface section (13a), and the amount of increase ´¸ k in the inclination angle of the first inner-ring raceway (7) occurring due to formation of the crimped section (15) are adjusted, so that the inclination angle Æ 1 of the first inner-ring raceway (7) and the inclination angle ˜ 2 of the second inner-ring raceway (8) in a state after the crimped section (15) has been formed are kept within respective proper ranges. |
