| 摘要 |
<p>An outer ring (11), an inner ring (12), and balls (13) are formed with a steel containing, by mass, 0.15-0.25% carbon, 0.45-0.55% silicon, 1.05-1.15% manganese, and 1.40-1.50% chromium, with the balance being iron and impurities, and the surfaces thereof respectively have an outer ring rolling surface (11A), an inner ring rolling surface (12A), and a ball contact surface (13A), which make rolling contact with other members. An outer ring carburized layer (11B), an inner ring carburized layer (12B), and a ball carburized layer (13B) are formed respectively so as to include the outer ring rolling surface (11A), the inner ring rolling surface (12A), and the ball contact surface (13A).</p> |
