| 摘要 |
PURPOSE:To effectively damp down vibration of a loss factor frequency by directly connecting a liquid chamber which is surrounded by an elastic body to an exclusive diaphragm chamber via plural orifices which are different in the peak frequency of loss factor. CONSTITUTION:In the vibration of a power unit, the high frequency component is damped down by a rubber body 24, a valve board 43, etc. while the low frequency component is damped down by first and second diaphragm chambers 31, 32. That is, to damp down the vibration of the low frequency component, a working fluid in a liquid chamber 25 moves between the first and second diaphragm chambers 31, 32 via first and second orifices 33, 34, accompanying the variation of the rubber body 24. Also, a loss factor peak frequency is set to the higher frequency band in a low frequency zone for the short orifice 33 while to the lower frequency band for the long second orifice 34, to damp down the vibration of each frequency. |
