Patent ID: 8864115

Claim:
A vibration isolation structure comprising: a composite laminated member configured by alternating layers of a plurality of hard plates with rigid properties and a plurality of soft plates with viscoelastic characteristics; a first flange member and a second flange member that are provided at stacking direction outer sides of the composite laminated member so as to hold the composite laminated member therebetween, and that respectively couple the composite laminated member to a vibration generating section and a vibration receiving section; and a stress reduction section that reduces hydrostatic stress from tensional load along the stacking direction of portions of the composite laminated member corresponding to a first end side and a second end side in a shear direction orthogonal to the stacking direction, to an amount that is lower than hydrostatic stress from tensional load along the stacking direction for other portions of the composite laminated member, wherein a length from the first end side to the second end side of the soft plates in a shear direction orthogonal to the stacking direction of the soft plates is shorter than a length between edge portions at other locations of the soft plates, wherein: the stress reduction section comprises a configuration wherein a length from the first end side to the second end side of the soft plates is shorter than a length between edge portions at other locations of the soft plates, the composite laminated member is formed in a circular shape as viewed along the stacking direction; and the stress reduction section comprises a configuration wherein the first end side and the second end side of the soft plates have straight line shapes as viewed along the stacking direction and outer edges of the stress reduction section not including the first end side and the second end side are arc-shaped.