Patent ID: 6899323
Filing Date: 2005-05-31
Classification: F16F

Abstract:
1. A method for manufacturing a vibration-isolating bushing which comprises (i) an inner cylinder having a bulge portion bulging out in a direction perpendicular to its axis in an axially central area, (ii) an outer cylinder disposed outside of the inner cylinder in a spaced relation, and (iii) an elastomer interposed between the inner cylinder and the outer cylinder, wherein the inner cylinder is composed of a metal pipe and an annular cover constituting the bulge portion provided on an outer periphery of an axially central part of the metal pipe, said method comprising the steps of: providing a knurling on the outer periphery of the axially central part of the metal pipe; providing a serration on at least one axial edge surface of the metal pipe; quenching the metal pipe provided with the knurling and the serration; securing the annular cover to the outer periphery of the quenched metal pipe inclusive of the knurling by molding of a synthetic resin; and vulcanization molding the elastomer at an outer periphery of the inner cylinder provided with the annular cover so as to enwrap the cover therein.