| 摘要 |
PURPOSE:To reduce noise due to vibration by providing at least three liquid chambers communicated with one another by orifice passages in the interior of a rubber body disposed between a shaft member and an outer cylinder member, and setting equivalent masses of the orifice passages to different values in the respective vibration systems. CONSTITUTION:A rubber body 3 has the inner peripheral side stuck to a shaft member 1 and the outer peripheral side stuck to an inner collar 4 of an outer cylinder member 2. In the interior of the rubber body 3, the first to third liquid chambers 7-9 are provided. The first and second liquid chambers 7, 8 are connected to each other by the first orifice 12 having a large equivalent mass, and the first and third liquid chambers 7, 9 are connected to each other by the second orifice having a small equivalent mass. Accordingly, when a shaft member 1 is displaced with respect to the outer cylinder member 2, the capacities of the respective liquid chambers 7-9 change to move a liquid in the interior. At this time, as the first and second liquid chambers 7, 8 are connected to each other by the orifice 12 having a large equivalent mass, they cause resonance in a low frequency range so that a large quantity of liquid passes so as to obtain a large loss factor. |
