Patent ID: 7159856

Claim:
A fluid sealed antivibration device comprising: a first connecting member secured to a vibration source side; a second connecting member secured to a car body side; and an elastic body section of a substantially conical shape disposed therebetween; wherein a fluid chamber is formed using the elastic body section and a partition member and divided into a main fluid chamber and a sub-fluid chamber by the partition member which is provided with an orifice passage for communicating with both the main fluid chamber and the sub-fluid chamber, and an opening and closing means is provided for opening and closing the orifice passage; wherein the opening and closing means for the orifice passage includes a seating section provided on a diaphragm forming the sub-fluid chamber, the seating section having a flat, disc-shaped central portion and ring-shaped section surrounding and extending below the disc-shaped central portion, the opening and closing means also including a pushing member for pushing the ring-shaped section of the seating section by a return spring, a space remaining between the pushing member and the disc-shaped central portion of the seating section, and the partition member including an upper section, an intermediate section, and a lower section stacked one above the other, each of the stacked sections having centers and outer circumferential edges aligned one above the other.