| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a roll bearing whose rolling resistance is further reduced. <P>SOLUTION: Grooves are formed at a large end surface 3a, a small end surface 3b, a large collar surface 5b and a small collar surface 5d. Excess lubricants which accumulate between the large end surface 3a and the large collar surface 5b, and between the small end surface 3b and the small collar surface 5d, respectively, can be eliminated certainly by such a configuration. Accordingly, the roll bearing 11 can reduce friction at a slide contacting portion, and thereby the rolling resistance is low. <P>COPYRIGHT: (C)2013,JPO&INPIT |
