| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a roller bearing for a ball screw support for reducing the weight of a rolling element and improving the fretting resistance, suppressing the damage of a raceway member when the impact load is applied. <P>SOLUTION: A ball 13 of a thrust angular ball bearing 1 for rotatably supporting a screw shaft constituting the ball screw with respect to a housing disposed opposite to the screw shaft is formed of a sintered body comprising, as the main component, a βsialon represented by a compositional formula of Si<SB>6-Z</SB>Al<SB>Z</SB>O<SB>Z</SB>N<SB>8-Z</SB>, satisfying 0.1≤z≤3.5, and impurities as the remainder, and also has a Young's modulus of 180 to 270 GPa. <P>COPYRIGHT: (C)2010,JPO&INPIT |
