Patent ID: 7275738

Claim:
A cylindrical fluid-filled vibration-damping device comprising: an inner cylindrical sleeve; an intermediate cylindrical sleeve disposed radially outwards of the inner cylindrical sleeve, and having a pair of ring portions at both ends in an axial direction, a connecting portion for integrally connecting the pair of ring portions, and an opening portion surrounded by the ring portions and the connecting portion; a stopper member disposed on an outer circumferential surface of the inner cylindrical sleeve and protruding radially in one direction towards the opening portion of the intermediate cylindrical sleeve; a rubber elastic body having: a pair of sidewall portions connecting the inner cylindrical sleeve with the pair of ring portions of the intermediate sleeve; an arm portion connecting the connecting portion and the inner cylindrical sleeve, while axially connecting the pair of sidewall portions; a recessed portion surrounded by the pair of sidewall portions and the arm portion and opening towards the opening portion; a thin diaphragm portion disposed between the pair of ring portions of the intermediate sleeve and being spaced apart from the inner cylindrical sleeve and the arm portion at a position radially opposite to the recessed portion; and a rubber seal portion disposed on radially outsides of the pair of ring portions; an outer cylindrical sleeve affixed on an outer circumferential surface of the intermediate sleeve, forming a primary fluid chamber filled with a non-compressible fluid inside the recessed portion that is fluid-tightly closed by the rubber seal portion compressed therebetween, forming an auxiliary fluid chamber filled with the fluid and defined by the diaphragm portion, and forming an orifice passage connecting the primary fluid chamber and auxiliary fluid chamber between the outer cylindrical sleeve and the connecting portion; and an elastic body striking portion formed of self-lubricating rubber and having a low coefficient of friction and disposed on a side of an inner circumferential surface of the outer cylindrical sleeve so as to be opposite to a tip of the stopper member, wherein the stopper member is formed of a rigid material and coated with a rubber layer, and is opposite to the elastic body striking portion of self-lubricating rubber with a spacing therebetween, so as to be adapted to come into abutting contact against the elastic body striking portion of self-lubricating rubber; and the elastic body striking portion of self-lubricating rubber is separate from the rubber elastic body including the rubber seal portion.