| 摘要 |
PURPOSE:To damp high frequency vibration by a structure wherein a vibrating means to change the volumes of small liquid chambers by minutely vibrating in the small liquid chambers lying between a vibration generating part and a vibration receiving part and further the volumes of the small liquid chambers changed by the vibrating means during vibration are different in response to the range of high frequency to be damped. CONSTITUTION:When vibration frequency is low, the vibrsation amplitude is large and the vibration prevention effect is improved by the damping action due to the viscous resistance produced by the movement, of the liquid in an upper small liquid chamber 26A or in a low samll liquid chamber 26B through an orifice 54 in the other chamber 26B or 26A. In addition, when vibration frequency lies between 20Hz and 40Hz, a movable body 32 does not vibrate, but only a movable body 38 minutely vibrates vertically. Consequently, the volumetric changes occur in the upper small liquid chamber 26A or in the lower small liquid chamber 26B, resulting in suppressing the pressure rise in said chamber 26A or 26B and reducing the transmitted force. Further, when the small amplitude and high frequency vibration exceeding 100Hz is concerned, the movable body 32 vibrates minutely, resulting in similarly changing the volume of the upper small liquid chamber 26A or of the lower small liquid chamber 26B and consequently suppressing the pressure rise in said chamber 26a or 26B. |
