| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a structure preventing deterioration of sealability caused by a small difference in level 28 existing at the end of a coating film 25. <P>SOLUTION: The end of a radial seal lip 18a is formed into a forked shape, and includes a pair of axially separated seal edges 26a, 26b. An axial interval L<SB>26</SB>between both the seal edges 26a, 26b is set equal to or wider than the axial displacement of a shaft portion 12 and a bearing cup 11 when in use from a neutral position in a direction where the insertion rate of the shaft portion 12 into the bearing cup 11 is increased. With this structure, the seal edge 26a at a base end is prevented from being moved beyond a step 28. <P>COPYRIGHT: (C)2010,JPO&INPIT |
