| 摘要 |
A vibration isolator (10) enabling simplification of a passage structure for connecting a negative pressure chamber in which a membrane is used as a partition wall and a valve chamber of a valve mechanism for opening and closing a second restriction passage to an operating pressure supply source, and simplification of connection of the negative pressure chamber and the valve chamber of the valve mechanism to the operating pressure supply source. The inner passage (63) of a communication tube (62) on the inner peripheral side of an outer cylinder member (20) communicates the negative pressure chamber (60) with the valve chamber (102). A pipe connection part (106) and a supply/discharge pipe (110) communicate the valve chamber (102) with the supply/discharge port (114) of a switching valve (112) on the outside of the vibration isolator (10). The switching valve (112) selectively communicates the supply/discharge port (114) to either an intake manifold (130) as the negative pressure supply source, or an atmosphere space. The negative pressure chamber (60) communicates with the valve chamber (102) through the communication tube (62) on the inner peripheral side of the outer cylinder member (20). Thus, either of a negative pressure and an atmospheric pressure, which is same as a pressure in the valve chamber (102), can be supplied into the negative pressure chamber (60), by supplying either of the negative pressure and the atmospheric pressure into the valve chamber (102) through the supply/discharge pipe (110) and the pipe connection part (106).
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