Patent ID: 6129362
Filing Date: 2000-10-10
Classification: F01N,F16J,F16L,Y10S

Abstract:
A spherical annular seal member which has a cylindrical inner surface defining a through hole in a central portion thereof, a partially convex spherical annular outer surface, and an annular end surface on a large-diameter side of the outer surface, comprising:an annular base portion including a matrix material comprising a first reinforcing member made from a compressed metal wire net and a compressed heat-resistant material filling meshes of said metal wire net, and a first composition mixed into said matrix material and comprising at least one of boron carbide and metal boride, metal fluoride, graphite, and aluminum phosphate; andan outer surface layer provided unitarily on said annular base portion and having said partially convex spherical annular outer surface, said outer surface layer including a second reinforcing member made from a further compressed metal wire net, and a second composition including at least one of boron carbide and metal boride, metal fluoride, graphite, and aluminum phosphate, said second composition being compressed and filling meshes of said further compressed metal wire net;said outer surface with said second reinforcing member and said second composition in mixed form with each other being smooth, whereby a heat resistibility of said annular base portion is improved and, during an operation of said spherical annular seal member, a solid lubricating coating is formed on a surface of a mating member which is mated to said spherical annular seal member.