| 摘要 |
<p>The seal member 7a with its base end connected to the metal core 5 has three seal lips 14, 15a, 16a. Of these, the intermediate seal lip 15a in the intermediate position is provided that the thickness of the tip end is d1, and that the thickness of the base end is d2. The innermost inner seal lip 16a is provided that the thickness of tip end is D1 and that thickness of the base end is D2. In this case, at least part of the base end of the intermediate seal lip 15a and inner seal lip 16a has its thickness regulated to be 0.2.d1</=d2</=0.8.d1, and 0.5.D1</=D2<D1. The tip edge of the inner seal lip 16a is fitted onto the outer peripheral surface of the radially inside cylindrical portion 12 of the slinger 6 with substantially zero interference. Consequently, even if the slinger 6 and metal core 5 are displaced relative to each other, excellent seal performance is secured while increase of torque is inhibited. <IMAGE></p> |
