Patent ID: 8382079

Claim:
A vibration isolating device, comprising: a cylindrical shaped main body integrated with a principal vibration input portion arranged inside the main body, an insulator for isolating vibrations of said principal vibration input portion from said main body by an elastic deformation of said insulator, a primary liquid chamber formed by said insulator and a second liquid chamber which is separated from said primary liquid chamber by a partition member, wherein said primary liquid chamber communicates with said second liquid chamber, said principal vibration input portion being provided in a central area of a concave curved wall portion formed in said insulator, a thin wall portion and a thick wall portion being formed by relatively varying a thickness of said insulator around the principal vibration input portion, wherein said concave curved wall portion of said insulator is formed in a substantially circular shape when viewed in a principal vibration inputted direction, said thick wall portion is formed substantially in the shape of a belt of a predetermined width and extends across said concave curved wall portion in a diametrical direction thereof while passing said principal vibration input portion, wherein connecting portions of said thick wall portion are provided in opposed outer peripheral restrained portions of said insulator which are connected with a reduced diameter portion formed on an upper end portion of said cylindrical main body, a covering portion of said thick wall portion which covers a lower end portion of said principal vibration input portion is formed as a rigid body covering portion, the width of said thick wall portion, which is a length in a direction across a longitudinal direction of said insulator when viewed in the principal vibration inputted direction, is identical from a vicinity of one outer peripheral restrained portion to a vicinity of the other outer peripheral restrained portion including the rigid body covering portion in the vicinity of said principal vibration input portion and excluding the outer peripheral restrained portions, and the rigid body covering portion for covering the lower end of said principal vibration input portion is provided in the central area of said thick wall portion, and wherein a thickness of said rigid body covering portion is 1.7 mm or greater.