| 摘要 |
<p>PURPOSE:To obtain a high damping force in a low frequency vibration range while a low transmitting force of vibration is maintained in a high frequency range, by providing such an arrangement that a pair of fluid chambers formed in a bushing are directly communicated together upon high frequency vibration while they are communicated together by way of an orifice upon low frequency vibration. CONSTITUTION:A pair of fluid chambers 26, 26 which are defined by an inner cylindrical metal member 12, an outer cylindrical metal member 14 and a rubber resilient member 16 are communicated together through communication holes 36, 36 in which movable members 38, 38 are disposed, for blocking the communication holes 36, 36 upon low frequency vibration so that the fluid chamber 26, 26 are communicated together through an orifice 42 while the fluid chambers 26, 26 are freely communicated together through the communication holes 36, 36 upon high frequency vibration. The inner cyrindrical metal member 12 is provided with stoppers 30, 30 against which the outer metal cylindrical member 14 abuts and which prevent the rubber resilient member 16 from excessively deforming.</p> |
