| 摘要 |
PURPOSE:To effectively reduce high frequency fine vibration and low-intermediate frequency vibration, generated in accordance with operation and running conditions, by using sealed fluid to serve as electroviscous fluid and fixing a movable plate, which permits a change of volume in a main fluid chamber, by a change of viscosity of the electroviscous fluid. CONSTITUTION:In an operative condition that high frequency vibration is in action, no voltage is applied to electrode plates 80, 81 from a control part 82, since a main fluid chamber 41 is changed in the volume little by little at a high speed by making a movable plate 4b movable in a range of looseness with an annular groove 43 with electroviscous fluid 7 in low viscosity, an orifice 40 is placed in a closed condition by increasing circulating resistance, and by deforming a rubber elastic unit 3 following a movement of the movable plate 4b, a dynamic spring constant is decreased. In an operative condition in which low-intermediate frequency vibration is in action, the movement of the movable plate 4b by looseness is restricted with the electroviscous fluid 7 in high viscosity by applying voltage, vibration is damped with flow-contraction resistance by movement of a large amount of fluid between the main and subfluid chambers 41, 50 through the orifice 40, and vibration absorbing action in a resonance frequency region by expansion-contraction elasticity of both fluid chambers 41, 50 is also exhibited. |
