| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a needle roller bearing capable of being used for a planetary gear mechanism while securing reliability. <P>SOLUTION: Since a spacer 12 of a needle roller bearing 10 is guided by a pinion shaft 4e and satisfies a dimension relation a<b, the spacer 12 is rotated at lower speed than revolution speed of a roller 11 by friction force acting on the same and a pinion shaft 4e. Thereby, an end surface of the roller 11 and the spacer 12 touch at a position where the roller 11 is not loaded (non-loaded zone) to decelerate revolution speed of the roller 11. Consequently, the roller 11 of which revolution speed is limited can receive friction force in the rotation direction from a planetary gear 4c and rotation of the roller 11 can be maintained. <P>COPYRIGHT: (C)2010,JPO&INPIT |
