Patent ID: 8474825
Filing Date: 2013-07-02
Classification: F16C,F16J

Abstract:
1. A sealing device comprising: an oil seal attached to a non-rotating housing, and having an oil resisting seal lip slidably brought into close contact with a rotating body inserted transversally to an inner periphery of the housing, the oil seal including: a reinforcing ring; and an extension section extending from the reinforcing ring, the extension section including: a dust cover attached to the rotating body and axially opposing the oil seal, the dust cover including: wherein the dust cover is provided with an external seal lip which is positioned at an outer side of a slide section between the oil resisting seal lip and rotating body and is slidably brought into close contact with the oil seal, a labyrinth seal is provided at an outer diameter side of the external seal lip, and the labyrinth seal is constructed by: the dust cover is provided with an auxiliary seal lip positioned between the external seal lip and the labyrinth seal, the auxiliary seal lip has a folded shape pressing against the intermediate tube section of the extension section, and is thinner than the external seal; and an elastic layer covers an entire inner surface of the dust cover facing the extension section of the oil seal.