| 摘要 |
PROBLEM TO BE SOLVED: To reduce the dynamic spring constant in the idling time and in an arbitrary frequency because the dynamic spring constant is higher on the high frequency side than the idling vibration when an orifice channel in a cylindrical bush part is made to be a damping orifice channel. SOLUTION: Side liquid rooms 20 in the cylindrical bush part 2 are mounted at the center, left and right both in the front and rear. The side liquid room 20A at the center in the front and the side liquid room 20B at the center in the rear are made to communicate with each other through a second orifice channel 24. The side liquid room 20C on the right side in the front and the side liquid room 20D on the right side in the rear are made to communicate with each other through a third orifice channel 35. The side liquid room 20E on the left side in the front and the side liquid room 20F on the left side in the rear are made to communicate with each other through a fourth orifice channel 36. Among the orifice channels above, the second orifice channel 24 is, for example, a damping orifice channel, the third orifice channel 35 is an idling orifice channel, and the fourth orifice channel 36 is another orifice channel further on the high frequency side. Then, the antiresonance caused by the liquid column resonance of the second orifice channel 24 is absorbed by the above orifice channels. |
