Seal assembly, and rolling bearing and hub unit assembled therewith

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 d₁, and the thickness of the base end is d₂. The thickness of the tip end of the innermost inner seal lip 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 and inner seal lip has its thickness regulated to be 0.2.d₁<=D₂<=0.8.D₁, and 0.5.D₁<=D₂1. 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.