Patent ID: 6505822
Filing Date: 2003-01-14
Classification: F16F

Abstract:
A liquid-sealed vibration-proof device comprising a vibration-insulating base, a diaphragm opposed to the vibration-insulating base, a liquid-sealed chamber enclosed between the vibration-insulating base and the diaphragm, and a partition having an orifice and dividing the liquid-sealed chamber into a main liquid chamber on the vibration-insulating base side and a subsidiary liquid chamber on the diaphragm side, wherein the partition is made up of:an orifice member including an annular wall section having an orifice channel at its outer circumference, and a central plate section having a plurality of openings, a partition plate member provided in contact with a lower surface of the orifice member and carrying the orifice member between itself and the vibration-insulating base, and a rubber-like elastomer membrane disposed in a space enclosed between the central plate section of the orifice member and the partition plate member, the rubber-like elastomer membrane including a central plate-form portion held to be pinched between the orifice member and the partition plate member and a diaphragm portion extending outboard from the central plate-form portion in an outer circumferential direction to terminate at an open end, the open end being brought in pressure contact with the annular wall portion of the orifice member at its inner peripheral surface so as to be slidable owing to a liquid pressure difference between the main liquid chamber and the subsidiary liquid chamber; and wherein the openings are provided at such positions that the central plate section of the orifice member and the partition plate member pinch and hold the central plate-form portion of the rubber-like elastomer membrane between them, the central plate-form portion being partly exposed at the openings to the main and subsidiary liquid chambers and formed as an elastic membrane capable of elastic deformation.