Vibration isolation device
A vibration isolation device ( 10 ) of the present invention includes: a tubular first attachment member ( 11 ) coupled to one of a vibration generating part and a vibration receiving part, and a second attachment member ( 12 ) coupled to the other thereof; an elastic body ( 13 ) which couples both the attachment members together; and a partition member ( 16 ) which partitions a liquid chamber in the first attachment member ( 11 ) in which a liquid (L) enclosed into a first liquid chamber ( 14 ) and a second liquid chamber ( 15 ), in which at least one of the first liquid chamber ( 14 ) and the second liquid chamber ( 15 ) has the elastic body ( 13 ) as a portion of a wall surface thereof; and a communication passage ( 30 ) which communicates with the first liquid chamber ( 14 ) and the second liquid chamber ( 15 ), and a barrier rigid body ( 33 ) which is disposed in the communication passage ( 30 ) are provided in the partition member ( 16 ).
1. A vibration isolation device, comprising:
a tubular first attachment member coupled to one of a vibration generating part and a vibration receiving part, and a second attachment member coupled to the other thereof;
an elastic body which couples both the attachment members together; and
a partition member which partitions a liquid chamber within the first attachment member having a liquid enclosed therein into a first liquid chamber and a second liquid chamber,
wherein at least one of the first liquid chamber and the second liquid chamber has the elastic body as a portion of a wall surface thereof,
wherein a communication passage which communicates with the first liquid chamber and the second liquid chamber, and a barrier rigid body which has rigidity such that the barrier rigid body is not deformed when being subjected to the flow of the liquid, is disposed in the communication passage and by which the flow of the liquid which flows through the communication passages is branched toward the outer side in the flow passage radial direction, are provided in the partition member,
wherein the barrier rigid body is formed of the partition member,
wherein the barrier rigid body does not move with respect to the partition member when the barrier rigid body receives a liquid pressure,
wherein passing gaps which are open toward both sides in the direction of a flow passage axis are provided, and
wherein an end surface of the barrier rigid body comprises a conical surface protruding toward an outer side in the flow passage axis.
2. The vibration isolation device according to claim 1 ,
wherein the barrier rigid body is disposed on the flow passage axis of the communication passage.
3. The vibration isolation device according to claim 1 ,
wherein a limit passage, which is provided independently from the communication passage and communicates with the first liquid chamber and the second liquid chamber, is provided in the partition member.
4. The vibration isolation device according to claim 2 ,
wherein a limit passage, which is provided independently from the communication passage and communicates with the first liquid chamber and the second liquid chamber, is provided in the partition member.
5. The vibration isolation device according to claim 1 , wherein the barrier rigid body has a shape having two portions which are symmetrical to each other with respect to the flow passage axis.