| 摘要 |
PURPOSE:To make it possible to reduce the transmission of vibration in middle and high frequency ranges, by regulating the size of a contracting passage and the like so that the resonant vibration frequency of fluid is made to substantially coincide with the resonant frequency in middle and high frequency range to cancel out a lost spring constant. CONSTITUTION:If the total area SW of a contracting flow passage 19a is greater than the effective piston area SE of an L section, two maximum values are present in dynamic multiplying factor, while if the areas SW, SE are equal to each other, two maximum values are similarly present. If the means m4 of fluid in a contracting passage 19a is increased, the frequency at which the maximum value is present is changed toward the low frequency side. Accordingly, by setting the mass m4 to a suitable value, the number of the maximum values is reduced to one so that resonance may be restrained. Accordingly, the size of the like of the contracting passage 19a in a partition member 19 is set to a suitable value so that a lost spring constant and an absolute spring constant thereof may be set, thereby the transmission of vibration in middle and high frequency range may be reduced. |
