Patent ID: 7264249
Filing Date: 2007-09-04
Classification: F16C,F16J

Abstract:
1. A hub unit comprising a hub ( 50 a ) and a flange ( 50 b ) integrally formed with the hub ( 50 a ), an inner ring ( 50 ) having a raceway surface for receiving rolling elements ( 70 ), an outer ring ( 40 ), and a seal ( 100 ) sealing the space between the inner ring ( 50 ) and the outer ring ( 40 ), said seal ( 100 ) comprising a core metal ( 200 ) and an elastic body ( 300 ) integrally molded with the core metal ( 200 ), said elastic body ( 300 ) including a radial lip ( 301 ) in sliding contact with an outer circumferential surface of the hub ( 50 a ) and one or more lips ( 302 , 303 ) in sliding contact with flange ( 50 b ), and said elastic body comprising a molded rubber, wherein the molded rubber comprises, as a raw rubber, acrylonitrile/butadiene rubber having an acrylonitrile monomer content of not less than 26% by weight and less than 36% by weight and, as a reinforcing filler, a carbon black in an amount of from 20 to 90 parts by weight per 100 parts by weight of the raw rubber, and wherein said molded rubber has a maximum value of loss tangent of 0.08 to 0.19 in a temperature range of from 20 to 70° C.