| 摘要 |
PROBLEM TO BE SOLVED: To prevent the increase of a dynamic spring constant in the vicinity of the primary frequency of a tire as sufficient damping occurs in the vicinity of the unsprung resonance frequency of a suspension. SOLUTION: Outer and inner cylinders 11 and 12 are interconnected through a pair of elastic bodies 17 and 18, and a pair of liquid chambers 21 and 22 formed on both sides thereof are intercommunicated through a communication passage 23. When unsprung resonance vibration having high amplitude is inputted, liquid flowing thereto and back therefrom between a pair of the two liquid chambers 21 and 22 through the communication passage 23, and unsprung resonance vibration is damped through attenuation occurring at this time. When primary resonance vibration, having a low amplitude, of a tire is inputted, elastic films 27 and 28 positioned facing the liquid chambers 21 and 22 are deformed and the change of internal pressures in the liquid chambers 21 and 22 is suppressed to a low value. Thereby, an amount of liquid flowing thereto and back therefrom between a pair of the liquid chambers 21 and 22 through the communication passage 23 is decreased and high damping is prevented from occurring, and the increase of a dynamic spring constant at a primary resonance frequency is suppressed. |
