Patent ID: 9683687
Date: 2017-06-20
CPC Classifications: F01N,F16C,F16L

Claim:
1. A spherical exhaust pipe joint comprising: an outer case which is secured to a pipe end portion of one of an upstream-side exhaust pipe and a downstream-side exhaust pipe having a pipe end portion disposed in such a manner as to oppose a pipe end portion of the upstream-side exhaust pipe; an inner case which is secured to a pipe end portion of another one of the upstream-side exhaust pipe and the downstream-side exhaust pipe, and which faces said outer case with a clearance therebetween in a radial direction; an annular first seal body which is disposed in the clearance on an upstream side and has an outer peripheral surface facing an inner peripheral surface of said outer case and an inner peripheral surface opposing that outer peripheral surface and facing an outer peripheral surface of said inner case; an annular second seal body which is disposed in the clearance on a downstream side of said first seal body and has an outer peripheral surface facing the inner peripheral surface of said outer case and an inner peripheral surface opposing that outer peripheral surface and facing the outer peripheral surface of said inner case; and a resiliently urging member which is disposed between said outer case and said inner case and resiliently urges said first seal body and said second seal body in an axial direction toward one of said outer case and said inner case, wherein in a case where the outer peripheral surface of said first seal body is shaped in a form of a convex spherical shape, a concave spherical seal seat facing a convex spherical outer peripheral surface of said first seal body is formed on the inner peripheral surface of said outer case, and in a case where the inner peripheral surface of said first seal body is shaped in a form of a concave spherical shape, a convex spherical seal seat facing a concave spherical inner peripheral surface of said first seal body is formed on the outer peripheral surface of said inner case, whereas in a case where the outer peripheral surface of said second seal body is shaped in a form of a convex spherical shape, a concave spherical seal seat facing a convex spherical outer peripheral surface of said second seal body is formed on the inner peripheral surface of said outer case, and in a case where the inner peripheral surface of said second seal body is shaped in a form of a concave spherical shape, a convex spherical seal seat facing a concave spherical inner peripheral surface of said second seal body is formed on the outer peripheral surface of said inner case.