摘要 |
A seal member with its base end connected to a metal core has three seal lips. The thickness of the tip end of the intermediate seal lip in the intermediate position is d<SUB>1</SUB>, and the thickness of the base end is d<SUB>2</SUB>. The thickness of the tip end of the innermost inner seal lip is D<SUB>1 </SUB>and that thickness of the base end is D<SUB>2</SUB>. In this case, at least part of the base end of the intermediate seal lip and inner seal lip has its thickness regulated to be 0.2 .d<SUB>1</SUB><=D<SUB>2</SUB><=0.8 .D<SUB>1</SUB>, and 0.5 .D<SUB>1 </SUB><=D<SUB>2</SUB><D<SUB>1</SUB>. The tip edge of the inner seal lip is fitted onto the outer peripheral surface of the radially inside cylindrical portion of a slinger with substantially zero interference. Consequently, even if the slinger and metal core are displaced relative to each other, excellent seal performance is secured while increase of torque is inhibited.
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