Patent ID: 8262291
Filing Date: 2012-09-11
Classification: F16C,F16J

Abstract:
1. A coreless seal arranged between a rotation shaft and a shell-type outer ring, the coreless seal having an inner diameter surface opposed to an outer diameter surface of said rotation shaft with a space for preventing leakage of fluid, wherein the shell-type outer ring has a flange bent inwardly, and further wherein an outer diameter and an inner diameter of said coreless seal are dimensions obtained by adding interference for an amount of shrinkage; and still further wherein the coreless seal has a lip part which projects inwardly and toward the flange of the shell-type outer ring; a surface of the outer diameter being flat when viewed in cross section; and an end surface of the coreless seal which is in contact with the flange of the shell-type outer ring in an axial direction is flat; wherein when it is assumed that said dimension obtained by adding interference for an amount of thermal shrinkage in a radial direction is A, and an outer diameter dimension of said coreless seal in a free state at room temperature is B, the following relation is satisfied, when it is assumed that an outer diameter dimension of said coreless seal in a free state at room temperature is B, and an inner diameter dimension of said outer ring is C, the following relation is satisfied, when it is assumed that said dimension obtained by adding interference for an amount of thermal shrinkage in a radial direction is A, an inner diameter dimension of said coreless seal in a free state at room temperature is D, and an outer diameter dimension of said rotation shaft is E, the following relation is satisfied,