Fluid-filled resilient bushing having excellent axial vibration damping characteristic

Claim 1

A fluid-filled resilient bushing comprising: an inner sleeve; an outer sleeve disposed in radially outwardly spaced-apart relation with said inner sleeve, and having a plurality of apertures; a sealing sleeve fitted on an outer circumferential surface of said outer sleeve, so as to fluid-tightly close said plurality of apertures; a generally annular resilient member interposed between said inner and outer sleeves so as to resiliently connect the inner and outer sleeves, and having a plurality of pockets aligned with said plurality of apertures; a plurality of arcuate partition walls disposed in said plurality of pockets, respectively, each of said partition walls being formed, as integral parts of said resilient member, so as to divide a radially inner portion of corresponding one of said plurality of pockets into two parts which are spaced apart from each other by said each partition wall in an axial direction of the bushing; a plurality of orifice members each of which is fluid-tightly accommodated in a radially outer portion of the corresponding pocket such that said each orifice member rests on corresponding one of said plurality of arcuate partition walls, so as to fluid-tightly close said two parts and thereby define a pair of fluid chambers which correspond to said two parts and which are filled with an incompressible fluid, said each orifice member being held in fluid tight relation with an inner circumferential surface of said sealing sleeve, and constituting at least a part of orifice means for defining an orifice through which said two fluid chambers communicate with each other.