| 摘要 |
PURPOSE:To reduce the amplitude of a car body in the whole rotational range by interposing a buffer constituted to afford communication between two oil chambers through a throttle hole and a change-over valve between an engine and a car body frame so that the change-over valve is closed in the low rotational frequency of the engine and opened in the high rotational frequency. CONSTITUTION:When vibration as shown by the arrow A is applied to a buffer 8 from an engine 2, a rotational frequency detector 15 additionally provided on a crankshaft 5 detects the rotational frequency of the engine which is processed by a control section 16 to close a change-over valve 14 in the low rotational frequency less than the resonance range and open same in the high rotational frequency exceeding the resonance range. Thus, when the change-over valve 14 is closed, oil chambers 12a, 12b communicate to each other only through a throttle valve 13 so that a damping force is intensified. On the other hand when the change-over valve 14 is opened, the change-over valve 14 having a large oil path plays the main part of oil shift to reduce the damping force. Thus the amplitude of a car body can be reduced in the whole rotational range. |
