| 摘要 |
PURPOSE:To improve the vibration proof effect and vibration suppressing effect by sealing a magnetic fluid in two fluid chambers communicated to each other by a constricted passage, and applying a magnetic field thereto in accordance with the number of vibration to change the viscosity of the fluid. CONSTITUTION:A solenoid 12 is arranged around the outer periphery of a constriction passage 8, and excited by a detection signal of a vibration sensor 13 arranged in a chassis side bracket B2 through an arithmetic device 14 and a current controller 15, and a magnetic field in correspondence to the vibration of an engine E to a magnetic fluid 9 passing through the passage 8. When the vibration is of a low frequency and a large amplitude, the magnetic force is increased to increase the viscosity of the fluid, while upon the high frequency vibration, the magnetic force is decreased or the excitation of the solenoid 12 is stopped to lower the viscosity of the fluid. Accordingly, as for the high frequency vibration, the flow resistance of the fluid is lowered, and the vibration suppressing function is removed and the vibration is damped by an insulator rubber 1 and the vibration is prevented. With the low frequency and large amplitude, the flow resistance is increased and the vibration suppressing effect is displayed. |
