| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rolling bearing that has a long service life under debris contaminated lubrication conditions and superior acoustic characteristics and low-torque properties. <P>SOLUTION: The abundance ratio of Si-Mn based nitride in a surface part of a ball 3 is ≤1.0-10.0% in terms of area ratio, and nitrogen content is ≥0.20-1.5 mass%. Vickers hardness (Hv<SB POS="POST">11</SB>) of the surface part of track surfaces 11, 21 of inner and outer races 1, 2, and the Vickers hardness (Hv<SB POS="POST">21</SB>) of the surface part of the ball 3 satisfy the following inequality (1), while the Vickers hardness (Hv<SB POS="POST">12</SB>) of a core part of the track surfaces 11, 21 of the inner and outer races 1, 2 and the Vickers hardness (Hv<SB POS="POST">22</SB>) of the core part of the ball 3 satisfy the following inequality (2): (1) Hv<SB POS="POST">11</SB>+50<Hv<SB POS="POST">21</SB><Hv<SB POS="POST">11</SB>+250; (2) Hv<SB POS="POST">12</SB>-100<Hv<SB POS="POST">22</SB><Hv<SB POS="POST">12</SB>+100. <P>COPYRIGHT: (C)2013,JPO&INPIT |
