| 摘要 |
PURPOSE:To simplify the structure of a device, by providing a means which moves a piston and changes the relative position of an opening part in the wall surface of a hollow piston to a penetration hole which can be communicated with the opening part by changing the penetration hole, an air chamber which can be expanded and contracted by the piston, and inside pressure of the air chamber. CONSTITUTION:At the time of shaking, a connecting pipe 66 and an intake manifold 74 are communicated with each other by a change-over valve 68, so that an air chamber 52 is in a negative pressure condition, a piston 48 compresses a compression coil spring 54, and an opening part 46 in a partition member 30 is closed by the piston 48. Therefore, a pressure receiving liquid chamber 32 and a sub liquid chamber 34 are communicated with each other through only a restricted passage 38, and liquid vibration is absorbed with its resistance. At the time of idling vibration, the restricted passage 38 is in a clogged condition, so that the connecting pipe 66 and an atmosphere communicating pipe 72 are communicated with each other, and the piston 48 is pressed by the compression coil spring 54. Then the penetration hole 60 in the piston 48 and the opening part 46 are communicated with each other, and liquid comes and goes within a range from the pressure receiving liquid chamber 32 to the sub liquid chamber 34 to absorb vibration. It is thus possible to simplify its structure. |
