| 摘要 |
A vibration isolating apparatus is provided which absorbs vibration over a wide frequency range. A main fluid chamber and a first sub-fluid chamber are separated from each other by a partitioning member and communicates with each other by a first restricting passage. The main fluid chamber and a second sub-fluid chamber communicate with each other by a second restricting passage. A concave portion is formed in the partitioning member and an elastic-membrane fixing pipe is inserted in and fixed to the concave portion. An outer periphery of an elastic membrane is adhered by vulcanization to an inner peripheral surface of the elastic-membrane fixing pipe. The space between the elastic membrane and the bottom of the concave portion is a gas chamber. When high frequency vibration is generated, the elastic membrane and the gas chamber function as an air spring, thereby making it possible to prevent a rise in the dynamic spring constant which is caused by an increase of internal pressure within the main fluid chamber.
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