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 comprising: spherical annular base member having a partially convex spherical surface and including a metal wire net and an expanded graphite which is compressed and formed integrally with said metal wire net in mixed form, and an outer layer including a metal wire net, a solid lubricant and a compressed expanded graphite and being formed integrally on the partially convex spherical surface, the expanded graphite of the outer layer and the solid lubricant of the outer layer filling meshes of the metal wire net of the outer layer, the metal wire net of said outer layer being 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, the metal wire net of said outer layer being overlaid on the partially convex spherical surface of said spherical annular base member in a radial direction, a surface constituted by the metal wire net of the outer layer and a surface constituted by the solid lubricant being mixed in an outer surface of the outer layer, an occupying area ratio of the surface constituted by the metal wire net of the outer layer on the outer surface of said outer layer being 30 to 60%.