Patent ID: 8025273
Filing Date: 2011-09-27
Classification: F16F

Abstract:
1. A liquid-filled anti-vibration mounting device including a mounting member to be mounted to an object to be supported by the mounting member, a support member supporting the mounting member through a robber elastic material, a liquid chamber formed between the mounting member and the support member that changes to volume with deformation of the robber elastic material, a partition member partitioning the liquid chamber into a pressure receiving chamber and a balancing chamber and an orifice passage communicating the pressure receiving chamber and the balancing chamber with each other, the partition member containing a robber movable plate which is approximately circular in an accommodation room formed inside the partition member and having a plurality of communication holes formed therein to communicate the accommodation room with the pressure receiving chamber and the balancing chamber, the movable plate being movable to absorb changes in the liquid pressures of the pressure receiving chamber and the balancing chamber, wherein at least a portion of the movable plate at an outer circumference thereof is formed into a flat plate, the partition member includes a pair of division walls that defines the accommodation room therebetween, one division wall adjoining the pressure receiving chamber and the other adjoining the balancing chamber, the plurality of communication holes are formed in the pair of division walls and arranged concentrically in two or more circumferential rows with respect to the center of the movable plate, and each of the communication holes in an outermost circumferential row in a first one of the pair of division walls are aligned in a circumferential direction with a corresponding one of the communication holes in an outermost circumferential row in a second one of the pair of division walls, and each of a first set of the communication holes in the outermost circumferential row in the second one of the pair of division walls are aligned in a circumferential direction with one of the communication holes in the outermost circumferential row of the first one of the pair of division walls and each of a second set of the communication holes in the outermost circumferential row in the second one of the pair of division walls are aligned in a circumferential direction with a respective portion of the first one of the pair of division walls that separates adjacent holes in the outermost circumferential row of the first one of the pair of division walls, so that upon action of a liquid pressure through the communication holes on the movable plate, at least a portion of the movable plate towards the peripheral edge thereof is deformed to undulate in a circumferential direction by the action of the liquid pressure.