Patent ID: 9279473
Filing Date: 2016-03-08
CPC Classification: F16F

Claim Text:
1. A fluid-filled cylindrical vibration-damping device comprising: an inner shaft member; an outer cylindrical member; a main rubber elastic body elastically connecting the inner shaft member and the outer cylindrical member, and having a plurality of pocket portions that open onto an outer peripheral face of the main rubber elastic body; a plurality of fluid chambers defined by covering the pocket portions with the outer cylindrical member and filled with a non-compressible fluid; at least one orifice member attached to an inner peripheral side of the outer cylindrical member so as to straddle openings of the pocket portions and extend in a circumferential direction, the at least one orifice member having an orifice forming groove that opens onto an outer peripheral face of the at least one orifice member and extends in the circumferential direction; an orifice passage for interconnecting the fluid chambers defined by covering an outer peripheral side opening of the orifice forming groove with the outer cylindrical member; a stopper rubber for limiting relative displacement of the inner shaft member and the outer cylindrical member in an axis-perpendicular direction being constituted by contact between the inner shaft member and the outer cylindrical member via the at least one orifice member, and the stopper rubber having an arcuate shape in the axis-perpendicular direction that conforms to an arcuate shape of an inside surface of the at least one orifice member in the axis-perpendicular direction; and a tubular intermediate sleeve having a pair of window portions, wherein a reinforcing rib is formed in the at least one orifice member so as to project from an inner peripheral bottom face of the orifice forming groove toward an outer peripheral side and extend in the circumferential direction while a projecting distal end face of the reinforcing rib is in contact with an inner peripheral face of the outer cylindrical member; wherein the reinforcing rib partitions at least a portion of a circumference of the orifice passage into a plurality of passages that have same fluid flow characteristics; wherein the inner shaft member and the intermediate sleeve are elastically connected by the main rubber elastic body; wherein the pocket portions of the main rubber elastic body comprise a pair of the pocket portions and open toward the outer peripheral side through the respective window portions of the intermediate sleeve; wherein the fluid chambers comprise a pair of the fluid chambers defined by the outer cylindrical member fitting externally onto the intermediate sleeve while covering the window portions; wherein the at least one orifice member comprises a pair of the orifice members each extending a length approximately equal to halfway around a circumference and being disposed so as to straddle the respective window portions in the circumferential direction; wherein two circumferential ends of each of the orifice members are clasped between the intermediate sleeve and the outer cylindrical member; and wherein the at least one orifice member is made thinner in the both circumferential end sections than in a circumferentially medial section so as to provide step portions at the both circumferential end sections, and the step portions engage a portion of the main rubber elastic body that surrounds the respective window portions of the intermediate sleeve in order to hold the at least one orifice member in place circumferentially.