| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fluid-sealed antivibration device having a new structure, which allows stable switching between a communicating state and an interrupted state of a second orifice passage tuned to high frequency side while suppressing hammering. <P>SOLUTION: In the fluid-sealed antivibration device 10, the outer periphery of a movable rubber film 60 is supported by a partition member 36, a cylindrical part 66 is formed at the center of the movable rubber film 60 in a projecting manner, and the second orifice passage 76 is formed using an inner hole 68 of the cylindrical part 66. Alternatively, an annular contact corner 78 facing the cylindrical part 66, on which one of the inner circumferential surface and outer circumferential surface of the cylindrical part 66 abuts over the whole circumference upon elastic deformation of the movable rubber 60, is formed on a surface facing the movable rubber film 60 in the partition member 36. The cylindrical part 66 abuts on the contact corner 78, thereby the inner hole 68 of the cylindrical part 66 is covered with the partition member 36 to interrupt the second orifice passage 76. <P>COPYRIGHT: (C)2012,JPO&INPIT |
