| 摘要 |
PURPOSE:To simplify the structure of a fluid-filled mount device for an automobile engine by forming each orifice passage executing a vibration proofing effect on the input vibration of a low frequency region and a high frequency region in such a way as to function each passage selectively by the switching of vacuum force action on an action chamber. CONSTITUTION:There are provided a first balance chamber 48 communicated with a pressure receiving chamber 44 through a first orifice passage 54, and a second balance chamber 60 communicated with the pressure receiving chamber 44 through a second orifice passage tuned to the higher frequency than the first orifice passage 54. A rubber elastic plate 58 is opposedly disposed behind a deflectable membrane 56 forming a part of the wall part of the second balance chamber 60, with a hard intermediate plate 42 held in between so as to apply energizing force to the deflectable membrane 56. The opening of the second orifice passage 72 is thereby closed by the flexible membrane 56. The rubber elastic plate 58 is sucked by the vacuum force of an action chamber 70 formed behind the rubber elastic plate 58 so as to open the second orifice passage 72 by the flexible membrane 56. |
