| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve both suppression and attenuation of a cavitation phenomenon. <P>SOLUTION: A main liquid chamber and a sub-liquid chamber are partitioned by a partitioning member 11, and a damping orifice passage 14 and an elastic partitioning part 30 are formed at the partitioning member 11. A stopper leg 35 is integrally and protrusively formed at the lower face of an elastic membrane 31 formed in the center of the elastic partitioning part 30, the stopper leg is pressed against the pressing face 47 of a support wall 44 of a frame member 40, a third liquid chamber 61 is formed between and among the support wall 44, the elastic partitioning part 30 and the stopper leg 35, a relief passage 60 is made to communicate with the main liquid chamber 12 in the vicinity of an opening 24 at the side of the main liquid chamber of the damping orifice passage 14, and the relief passage is made to always communicate with the sub-liquid chamber 13 at an opening 62 of the sub-liquid chamber. At a normal time, the damping orifice passage 14 and the third liquid chamber 61 are resonantly broadened by generating liquid-column resonance, respectively. Upon input of excessively-large amplitude vibration, a clearance between the stopper leg 35 and the support wall 44 is opened, the sub-liquid chamber and the main liquid chamber are made to communicate with each other via the relief passage 60, and the cavitation phenomenon is suppressed. <P>COPYRIGHT: (C)2012,JPO&INPIT |
