Lquid-filled vibration isolator

A liquid-filled vibration isolator comprising:

• a first mounting member;
• a cylindrical second mounting member;
• a vibration isolation body comprising rubber elastic body, and connecting the first mounting member with the second mounting member so as to block an opening portion of one end side of the second mounting member in an axis direction;
• a diaphragm comprising rubber elastic body, and blocking an opening portion of another end side of the second mounting member in the axis direction;
• a partition member retained within an inner circumference side of the second mounting member between the diaphragm and the vibration isolation body, and partitioning a liquid chamber into a first liquid chamber at a side of the vibration isolation body and a second liquid chamber at a side of the diaphragm;
• an orifice portion formed in the partition member, and communicating the first liquid chamber to the second liquid chamber;
• and
• a disc-shaped elastic movable body stored in the partition member and comprising rubber elastic body;
• wherein the orifice portion comprises at least a first orifice and a second orifice resonating with higher frequency than the first orifice,
• wherein the elastic movable body comprises a retained portion constituting a part of an inner circumference side of the elastic movable body and retained in the partition member, an outer circumference portion protruding outwardly in a diameter direction from the retained portion and arranged in a flow path of the second orifice, and a first valve portion protruding upwardly and downwardly in the axis direction from an outer circumference end side of the outer circumference portion,
• wherein the second orifice comprises a circumference wall surface facing the first valve portion in the diameter direction and forming a flow path with the first valve portion,
• wherein a size of the outer circumference portion in the diameter direction is larger than a size of the outer circumference portion in the axis direction,
• wherein the second orifice comprises a pair of facing surfaces protruding inwardly in the diameter direction from the circumference wall surface, and facing the first valve portion on both sides in the axis direction,
• wherein the first valve portion and the facing surfaces are configured in such a manner that contact of the first valve portion with the facing surfaces causes the second orifice to be in a blocking state in which liquid flow cannot be done through the second orifice, and that separation of the first valve portion from the facing surfaces causes the second orifice to be in a communication state in which liquid flow can be done through the second orifice,
• a leak flow path formed in at least one of the first valve portion or the facing surface, the leak flow path maintaining the communication state of the second orifice in a case that the first valve portion contacts with the facing surface when vibration with a first predetermined amplitude is input, the leak flow path maintains the communication state between the first liquid chamber and the second liquid chamber thorough the second orifice,
• the leak flow path is formed by a recess portion formed on the facing surfaces, wherein a plurality of the recess portions are formed in the circumference direction, and
• a slope surface connecting the facing surfaces with a bottom surface of the recess portion in the circumference direction, wherein both ends of the bottom surface in the circumference direction and the facing surfaces are connected by the slope surface.