Patent ID: 6152453
Filing Date: 2000-11-28
Classification: F01N,F16J,F16L,Y10S

Abstract:
A spherical annular seal member having 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 a heat-resistant lubricant, aluminum phosphate, and at least one of graphite and a metal fluoride, said compressed heat-resistant material being of at least one kind selected from expanded graphite, mica, and asbestos; andan outer surface layer provided unitarily on said annular base portion and forming 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 a heat-resistant lubricant, aluminum phosphate, and at least one of graphite and a metal fluoride, said second composition being compressed and filling meshes of said further compressed metal wire net;said outer surface with said second composition compressed and filling in the meshes of said second reinforcing member being smooth; andsaid metal fluoride being of at least one kind selected from calcium fluoride, lithium fluoride, sodium fluoride, and barium fluoride.