There is provided a vibration isolator in which a restriction passage for causing a main fluid chamber and a sub-fluid chamber to communicate with each other is changed over to one of a first restriction passage and a second restriction passage according to a change in the frequency of vibrations in a short period of time, and the size of the isolator is made small efficiently. A plunger member 78 closes an orifice opening 74 when being moved to a closing position against the urging force of a coil spring 90 by the fluid pressure in a pressurization space 130, and opens the orifice opening 74 when being returned to an opening position by the urging force of the coil spring 90. For the orifice opening 74, the opening ratio R between the transverse opening width along the axial direction and the longitudinal opening width along the circumferential direction is set in the range of 2 R 25, further preferably 5 R 20. Thereby, the longitudinal opening width can be made sufficiently small while an opening area necessary for the orifice opening 74 is secured. Therefore, the distance between the opening position and the closing position of the plunger member 78 can be shortened according to the longitudinal opening width.
VIBRATION ISOLATOR
SCHWINGUNGSDÄMPFUNG
SÉPARATEUR DE VIBRATIONS
2015-12-30
Patent
Electronic Resource
English