Patent ID: 6726211
Filing Date: 2004-04-27
Classification: F16J

Abstract:
A sealing device comprising:a fitting portion fixed on a first surface forming an annular gap with a second surface, a single sealing section supported by a support of the fitting portion, said single sealing section including a plurality of axial lips with lip tips of the axial lips coming into contact with the second surface, the annular gap being sealed by said plurality of axial lips to isolate a sealed side on one side of said single sealing section and a non-sealed side on an opposite side of said single sealing section, a first axial lip being located on the sealed side relative to a second axial lip located on the non-sealed side, the second axial lip supporting the first axial lip, and ribs for pumping a sealing fluid to the sealed aide being formed on the plurality of axial lips at the non-sealed side, a single surface of the first axial lip of said plurality of axial lips extending from the lip tip of the first axial lip on the non-sealed side and extending to and terminating at a single surface of the second axial lip of said plurality of axial lips extending from the lip tip of the second axial lip on said sealed side, said second axial lip including a non-ribbed portion located between said lip tip of said second axial lip and the ribs on the non-sealed side of said second axial lips, an inner diameter of said first axial lip being less than an inner diameter of said second axial lip so as to prevent the ribs of the second axial lip from coming into contact with a rotary shaft prior to the ribs of the first axial lip and said ribs of said second axial lip can cope with an eccentricity of the rotary shaft.