Patent ID: 7357379
Filing Date: 2008-04-15
Classification: F16F

Abstract:
1. A cylindrical suspension bushing for an automotive vehicle, comprising: a cylindrical inner shaft member; a cylindrical outer sleeve member disposed radially outward of said inner shaft member; and an elastic body disposed in between and elastically connecting said inner shaft member and said outer sleeve member, wherein said elastic body is provided with two pairs of axial bores diametrically opposed to each other with said inner shaft member interposed therebetween, said axial bores axially extending through said elastic body between said inner shaft member and said outer sleeve member and being independent of each other, wherein said elastic body is circumferentially divided in terms of stress transmission by said two pairs of axial bores into two pairs of segments diametrically opposed to each other with said inner shaft member interposed therebetween, wherein two diametric lines, which extends in directions in which said two pairs of axial bores are respectively opposed to each other, intersect obliquely so that said two pairs of segments are made different from each other in their circumferential length for differentiating spring characteristics of said bushing in two diametric directions in which said two pairs of segments are opposed to each other, respectively, wherein said two pairs of axial bores are provided in said elastic body for adjusting sizes of pressure-receiving regions of said elastic body in mutually orthogonal diametric load input directions, wherein each of said axial bores has a biased ellipsoidal shape in transverse cross section, whose circumferential width dimension is made larger on a side of said outer sleeve member rather than on a side of said inner shaft member, and wherein each of said axial bores is formed such that a radially inner small-diameter arc portion and a radially outer large-diameter arc portion are connected with each other at their opposite circumferential ends via curved lines.