| 摘要 |
PROBLEM TO BE SOLVED: To provide an excellent vibration isolating property against input vibration of a specified frequency region in such a state that excess deformation of a resilient body due to a heavy load is regulated. SOLUTION: A high frequency orifice E to intercommunicate main and auxiliary liquid chambers A and B is formed at a partition plate 15 and a valve member 17 comprising a valve element 171 having a protrusion 172 protruded in a main liquid chamber A; a coil spring 173 to energize the valve element 171 into the closed state of the high frequency orifice E; and a stopper 174 made of an elastomer vulcanized and adhered to the under surface of the valve element 171 is arranged at the interior of the high frequency orifice. When an agitating plate 16 displaced downward along with deformation of a resilient body 13 due to a heavy load presses down the protrusion 172, the valve element 171 releases the orifice E to realize a low dynamic spring constant. |
