Patent ID: 8567793
Filing Date: 2013-10-29
Classification: F01N,F16J,F16L

Abstract:
1. A spherical annular seal member for use in an exhaust pipe joint comprising: a spherical annular base member defined by a cylindrical inner surface, a partially convex spherical surface, and large- and small-diameter-side annular end faces of the partially convex spherical surface; and an outer layer formed integrally on the partially convex spherical surface of said spherical annular base member, wherein said spherical annular base member includes a reinforcing member made from a metal wire net and a heat-resistant material containing expanded graphite, filling meshes of said metal wire net of said reinforcing member, and compressed in such a manner as to be formed integrally with said reinforcing member in mixed form, and wherein said outer layer includes a base layer and a sliding layer constituted of a lubricating composition and adherently formed integrally on said base layer at an outer layer intermediate surface, said base layer including another reinforcing member made from a metal wire net and compressed and another heat-resistant material containing another expanded graphite, filling meshes of said metal wire net of said another reinforcing member, compressed so as to be closely press bonded to said another reinforcing member, and forming the outer layer intermediate surface together with a surface of said another reinforcing member, said base layer being formed integrally with the partially convex spherical surface, the surface of said another reinforcing member in the outer layer intermediate surface being present in a scattered manner with an area ratio of 5 to 35% with respect an entire surface of the outer layer intermediate surface, an obverse surface of said outer layer exposed to an outside being constituted of a smooth surface of said sliding layer.