LIQUID SEAL VIBRATION ISOLATING DEVICE

PURPOSE:To display effective vibration isolating action by applying a simple construction to a device for altering its characteristics. CONSTITUTION:A main liquid chamber A is formed within a space closed with a partitioning plate 6 in a vibration isolating rubber 1 to support a vibrating body, and the outer periphery of a cylindrical member 8 whose inside is used as a flow path L1 communicating with the chamber A is provided with an electromagnetic coil 4 and a rubber film 2 whose center is joined to the coil 4, and a subliquid chamber B is formed below the rubber film 2. The upper half inside of a cylindrical member 8 is provided with a movable wall 3 having a formed magnetic pole, and the above inside communicates with the subliquid chamber B through a throttle flow path L2 in a base part 82. When a large vibration is inputted, electric current is applied to the coil 4 to move the movable wall 3 in a phase reverse to a vibration phase, and strong internal pressure is thereby generated in the main liquid chamber A to control the vibration. When a small vibration is inputted, the movable wall 3 is moved in the same phase as the vibration one to control the occurrence of the internal pressure for absorbing the vibration.