| 摘要 |
PURPOSE: To improve durability to large displacement input, and improve vibration insulating performance when small amplitude vibration having a medium- high frequency is inputted in a condition where displacement is regulated by a stopper mechanism. CONSTITUTION: A piston 7 whose central part is fixed to a center boss 2 and outer peripheral part can be elastically contacted with a stopper 6 or an orifice member 52 of a partition wall 5, is provided in a first liquid chamber A, and at contact time of the piston 7, a passage to mutually communicate spaces A1 and A2 on both sides in the shaft direction of the piston 7 in the first liquid chamber A, is formed between its contact surfaces by a groove 73a or 73b. Even if medium-high frequency vibration having a small amplitude is intermittently inputted in this contact condition, since pressure of the spaces A1 and A2 by the vibration is released through the passage by the groove 73a or 73b, a rise in a dynamic spring constant is restrained. |
