| 摘要 |
PURPOSE:To get a constantly effective prevention of vibration by forming ring-shapedly another communicating passage between liquid rooms by the spacing between an inner tube and a tubular rigid member having a through hole in its radial direction, and loosely fitting a link member for shutting the through hole or adjusting the rate of opening thereof into this communicating passage. CONSTITUTION:A communicating passage 5 for liquid rooms 4, 4 is formed on the peripheral side of the middle tube 11 of an elastic body 3 between the tube and an outer tube. Besides another communicating passage 9 by which the liquid rooms 4, 4 are communicated with each other is formed ring-shapedly by the spacing between an inner tube 1 and a tubular rigid member 7 having through holes in its radial direction. A ring-shaped member 8 capable of shutting the through hole 6 or adjusting the rate of opening thereof is loosely fitted into this ring-shaped communicating passage 9. With this constitution, the through hole 9 is opened in the case of high frequency micro amplitude within a region where the communicating hole 5 becomes incapable of allowing any flow therethrough. The changed volume of the liquid room 4 is thereby absorbed to prevent dynamic spring constant from increasing. While in the case low frequency great amplitude the through hole 6 is closed and the passage 5 on the peripheral side becomes capable of allowing liquid flow therethrough so that the vibration is attenuated promptly. |
