Patent ID: 8596621

Claim:
A liquid-sealed type vibration isolator, comprising: a first fixture; a cylindrical second fixture; a vibration-isolating base member formed of a rubbery elastic material for coupling the first fixture and the second fixture; a diaphragm formed of a rubbery elastic membrane which is mounted to the second fixture and defines a liquid-sealed chamber between the vibration-isolating base member and itself; a partitioning member configured to partition the liquid-sealed chamber into a first liquid chamber on the side of the vibration-isolating base member and a second liquid chamber on the side of the diaphragm, and an orifice configured to communicate the first liquid chamber and the second liquid chamber; wherein the partitioning member comprises: an annular orifice forming member provided inside a peripheral wall portion of the second fixture and forming the orifice; an elastic wall formed of the rubbery elastic material which closes the inner peripheral surface of the orifice forming member; and a pair of partitioning plates connected to each other via a coupling portion penetrating through the radially center portion of the elastic wall and holding the elastic wall therebetween in the axial direction of the elastic wall, wherein the pair of partitioning plates each comprises a holding portion which holds the elastic wall radially outward of the coupling portion, the holding portion comprises a first holding portion provided radially outward and a second holding portion provided radially inward, and the first holding portion is provided with a high compression holding portion configured to hold the elastic wall at a compression ratio higher than the second holding portion in the axial direction, and wherein the elastic wall is provided with a plurality of depressions in the circumferential direction on at least one of front and back wall surfaces of the elastic wall in an elastic wall portion to be held between the high compression holding portions, thereby having thin low-stiffness portions discontinuously in the circumferential direction in the elastic wall portion.