Shaft seal

摘要

A thickness dimension of a peripheral edge of a seal element held by an inner brim wall portion of an outer case and an inner brim wall portion of an inner case is set to be larger than a thickness dimension of a remaining portion of the seal element, and a ring concave groove is formed on the peripheral edge of the seal element.

主权项

1. A shaft seal comprising a construction in which:
a thickness dimension of a peripheral edge of a seal element held by an inner brim wall portion of an outer case and an inner brim wall portion of an inner case is set to be larger than a thickness dimension of a remaining portion of the seal element to form a thick portion protruding only towards the inner case on the peripheral edge of the seal element; a width in radial direction of the thick portion of the seal element in unassembled state is set to be smaller than a width dimension in radial direction of a portion on which the inner brim wall portion of the inner case presses the seal element; and a curved corner portion is formed on a corner of a cylindrical wall portion and the inner brim wall portion of the inner case to make a most outer peripheral end portion of the thick portion of the seal element uncompressed in an assembled state, wherein the inner case has an upper end portion, and has an upper portion disposed between the upper end portion and the peripheral edge of the seal element, the upper portion extends away from the peripheral edge of the seal element, the outer case has a caulking piece portion covering at least a part of the upper end portion of the inner case, the curved corner portion of the inner case is L-shaped to increase an interval dimension between the curved corner portion and an inner corner portion of the outer case on an outer end in radial direction as to make the most outer peripheral end portion of the thick portion of the seal element uncompressed, and an inner face of the outer case, except the inner corner portion of the outer case, and an outer face of the inner case, except the curved corner portion of the inner case, are flat faces.