| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved fluid sealed type vibration-proof device capable of further improving a vibration-proof effect against a high frequency vibration while effectively attaining both a vibration-proof effect by an orifice passage and a cavitation restricting effect.SOLUTION: This invention relates to a fluid sealed type vibration-proof device 10 in which an opening part of a communication port 48 facing a pressure receiving chamber 72 and communicating between the pressure receiving chamber 72 and a balance chamber 74 is closed by a closing rubber elastic plate 36 and a pressure of each one of both chambers 72, 74 may act against both surfaces of the closing rubber elastic plate 36. An outer peripheral edge of the closing rubber elastic plate 36 is provided with a plurality of abutting holder segments 62 supported by a partition member 30. An elastic deformation region 66 for changing-over a closing and an opening of the communication port 48 is formed between the abutting holder segments 62, 62 adjoining in a peripheral direction and at the same time an intermediate portion in a peripheral direction in the elastic deformation region 66 is provided with a mass part 68. A resonance frequency of a mass-spring system 70 by the mass part 68 and the elastic deformation region 66 is set to 50 Hz or more and a higher frequency than a tuning frequency of an orifice passage 76.SELECTED DRAWING: Figure 1 |
