| 摘要 |
PURPOSE:To simplify attachment of a limiting means by providing a main liquid chamber of which a part of a partition wall in an elastic body, a sub liquid chamber communicated to the main liquid chamber by means of a plurality of limiting passages, and a limiting means provided on an attachment bracket and changing the liquid passing cross-sectional areas of the one or more limiting passages. CONSTITUTION:When the vehicle is running at a high speed and occurrence of shake vibration is judged by a control means 68, an actuator 66 moves a shaft 63 toward an outer cylinder 14. Consequently, the choking rubber 64 of a choking valve 62 touches the outer cylinder 14 and chokes a circular hole 28, liquid 28 passes only a shake orifice 52 and moves between a main liquid chamber 32 and a sub liquid chamber 34. Shake vibration is absorbed by resistance and resonance of a liquid column at that time. When the control means 68 judges occurrence of idling vibration during the idling operation or the running in low speed, the actuator 66 separates the shaft 63 from the outer cylinder 14. Therefore the choking valve 62 does not choke the circular hole 58, and liquid 28 is allowed to pass the shake orifice 52 and additionally an idle orifice 50, so that idling vibration is absorbed by passing resistance and resonance of the liquid column. |
