Spherical annular seal member and method of manufacturing the same

摘要

A spherical annular seal member 40 includes: a spherical annular base member 38 which is defined by a cylindrical inner surface 34 defining a through hole 33 in a central portion, a partially convex spherical surface 35, and annular end faces 36 and 37 on large- and small-diameter sides of the partially convex spherical surface 35; and an outer layer 39 formed integrally on the partially convex spherical surface 35 of the spherical annular base member 38.

主权项

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 annular end faces on large- and small-diameter sides 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 for said spherical annular base member made from a compressed knitted metal wire net which is knitted by using a fine metal wire with a diameter of 0.28 to 0.32 mm and whose mesh size is 4 to 6 mm long and 3 to 5 mm wide and a heat-resistant material for said spherical annular base member containing expanded graphite and compressed in such a manner as to fill meshes of the knitted metal wire net of the reinforcing member and to be formed integrally with the reinforcing member in mixed form, and wherein said outer layer includes a reinforcing member for said outer layer made from a compressed knitted metal wire net which is knitted by using a fine metal wire with a diameter of 0.10 to 0.20 mm and whose mesh size is 1.0 to 3.0 mm long and 0.5 to 2.5 mm wide, a solid lubricant consisting of a lubricating composition, and a heat-resistant material for said outer layer containing expanded graphite, the heat-resistant material and the solid lubricant for said outer layer being compressed in such a manner as to fill meshes of the knitted metal wire net of the reinforcing member for said outer layer, the reinforcing member for said outer layer being overlaid on the partially convex spherical surface of said spherical annular base member densely in a radial direction, an outer surface of said outer layer being formed into a smooth composite surface in which a surface constituted by the reinforcing member for said outer layer and a surface constituted by the solid lubricant are exposed in mixed form, an occupying area ratio of the surface constituted by the reinforcing member for said outer layer on the outer surface of said outer layer being 30 to 60%.