Vibration-damping device

1. A vibration-damping device comprising:

a tubular first attachment member coupled to any one of a vibration generating part and a vibration receiving part, and a second attachment member coupled to the other thereof;

an elastic body coupling both of the attachment members; and

a partition member that 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 the first liquid chamber of the first liquid chamber and the second liquid chamber has the elastic body on a portion of a wall surface thereof,

wherein a limiting passage that allows the first liquid chamber and the second liquid chamber to communicate with each other is formed in the partition member,

wherein a first limiting passage of the limiting passage that resonates with input of a first vibration, and a second limiting passage of the limiting passage that resonates with input of a second vibration with a greater amplitude than the amplitude of the first vibration,

wherein the first limiting passage includes a pressure loss unit that causes a loss in the pressure of the liquid that flows therethrough,

wherein the pressure loss unit is provided with an intermediate chamber disposed in the partitioning member, a first communication passage that allows the intermediate chamber and the first liquid chamber to communicate with each other, and a second communication passage that allows the intermediate chamber and the second liquid chamber to communicate with each other,

wherein the intermediate chamber is formed in a circular shape in plan view,

wherein an opening axis of a first opening that opens toward an inside of the intermediate chamber in the first communication passage and an opening axis of a second opening that opens toward an inside of the intermediate chamber in the second communication passage are offset from each other,

wherein at least one of the first opening and the second opening opens toward a wall surface that defines the intermediate chamber,

wherein a first pressure loss unit of the pressure loss unit in which the first communication passage directly communicates with the first liquid chamber and the first opening opens toward the wall surface that defines the intermediate chamber, and

wherein, in the first pressure loss unit, a portion that faces the first opening and that is in the wall surface that defines the intermediate chamber is formed by the elastic membrane,

wherein any one of the first communication passage and the second communication passage opens in a circumferential direction of the intermediate chamber within the intermediate chamber, and

wherein a swirling flow of the liquid is formed within the intermediate chamber according to a flow speed of the liquid flowed into the intermediate chamber, and

wherein the liquid is flowed out of the other of the first communication passage and the second communication passage.

2. The vibration-damping device according to claim 1 ,

wherein a second pressure loss unit of the pressure loss unit in which the second communication passage directly communicates with the second liquid chamber and the second opening opens toward the wall surface that defines the intermediate chamber,

wherein the intermediate chamber of the first pressure loss unit and the intermediate chamber of the second pressure loss unit are adjacent to each other with the elastic membrane interposed therebetween, and

wherein, in the second pressure loss unit, a portion that faces the second opening and that is in the wall surface that defines the intermediate chamber is formed by the elastic membrane.

3. The vibration-damping device according to claim 1 ,

wherein, in the first pressure loss unit, a portion, which is provided with the first opening and faces the elastic membrane, in the wall surface that defines the intermediate chamber is formed in the shape of a convexly curved surface that becomes convex toward the elastic membrane.