Patent ID: 7219882
Filing Date: 2007-05-22
Classification: F16F

Abstract:
1. A fluid-filled vibration damping bushing comprising: (I) a bushing body having an inner tubular metal member, an outer peripheral sleeve disposed coaxially about the inner tubular metal member and a base rubber interposed between and elastically connecting the inner tubular metal member and the outer peripheral sleeve, the base rubber having a pair of depressions recessed towards an inner tubular metal member side and open in an outer circumferential surface of the base rubber, so as to provide mutually independent first and second fluid chambers having a non-compressible fluid sealed therein, and the outer peripheral sleeve having a pair of aperture window of shape corresponding to openings of the first and second fluid chambers; (II) an orifice member at least partially defining an orifice passage extending between the openings of the first and second fluid chamber so that the fluid sealed within the first and second fluid chambers is caused to flow between the chambers; (III) an outer tubular metal member having a seal rubber layer integrally bonded by vulcanization to an inner circumferential surface thereof for liquid-tight sealing of the first and second fluid chambers, and fastened to an outer circumferential surface of the outer peripheral sleeve via the seal rubber layer, closing off the openings of the first and second fluid chambers; and (IV) a stopper rubber constituted as a separate element from the base rubber, disposed at a circumferential location corresponding at a minimum to either the first or second fluid chamber, for restricting relative displacement of the inner tubular metal member and the outer tubular metal member in an axis-perpendicular direction, wherein the stopper rubber is formed separately from the orifice member and is bonded to a first axial end portion of the outer tubular metal member at a location outside the first and second fluid chambers so as to face toward the inner tubular metal member, and the outer tubular metal member with the stopper rubber attached thereto is inserted onto the bushing body from an other axial end thereof.