| 摘要 |
PURPOSE:To spread the tuning region of the dynamic spring characteristic by installing a diaphragm tension adjusting mechanism which is constituted of an orifice constitution body for partitioning the first and second fluid chambers, diaphragm of the second fluid chamber, operating rod driven by an actuator, and a stopper corresponding to the operating rod. CONSTITUTION:When a vehicle is in idling state, the boss part 25a of an operating rod 25 pushes a diaphragm 21, and the stopper 27 of an orifice constitution body 15 is pushed. When the higher low frequency vibration is applied to an upper plate 1 from a power unit, the fluid flow quantity increases between fluid chambers 20 and 30 through an orifice 13, and the vibration transmitted to a vehicle side, accompanied with the resonance of the fluid, can be reduced. On the start of the vehicle, the operating rod 25 is shifted in the opposite direction to the diaphragm 21 through a pinion 31 by the revolution of an actuator 29, and the diaphragm 21 is put into free state. Then, the fluid flow quantity increases between the fluid chambers 20 and 30 through the orifice 13, and the vibration due to the engine shake can be reduced. |
