Lip seal

摘要

First pumping threads (125) are formed on an inner circumferential surface of the seal lip portion (124) of an elastomer lip member (12). The first pumping threads (125) generate a pumping action in a leakage direction when a shaft (2) rotates. A first resin lip member (14) is arranged at a rear side of the elastomer lip member (12). Second pumping threads (144) generate a pumping action in a direction opposite to the leakage direction when the shaft (2) rotates. The second pumping threads (144) are formed from an inner circumferential surface of a seal lip portion (143) of the first resin lip member (14) to a rear portion of a bent portion (142) thereof. A second resin lip member (18) is arranged at a rear side of the first resin lip member (18) and has a surface sliding on the shaft (2), which is formed smoothly (Fig. 1). <IMAGE>