VIBRATION ISOLATION DEVICE

摘要

The objective of the present invention is to provide a vibration isolation device having superior overall strength. The vibration isolation device is formed by integrating: a rubber elastic body (3) having vibration isolation functionality; and a resin bracket (2) that affixes the rubber elastic body (3) to a substrate in the state of supporting the rubber elastic body (3). The resin bracket (2) comprises a sandwich-formed body formed by a core layer (2a) being sandwiched by skin layers (2b). The belowmentioned (I) to (III) are simultaneously satisfied. (I) The polyamide resin composition (A) configuring the skin layers (2b) contains a polyamide resin (a) and glass fibers (x), and the mixing ratio (a/x) thereof is 40/60-75/25 by mass. (II) The polyamide resin composition (B) configuring the core layer (2a) contains a polyamide resin (b) and glass fibers (y), and the mixing ratio (b/y) thereof is 35/65-60/40 by mass. (III) The melt viscosity (?a) measured at 30°C higher than the melting point of polyamide resin composition (A) and a shear rate of 1000 s-1 and the melt viscosity (?b) measured at 30°C higher than the melting point of polyamide resin composition (B) and a shear rate of 1000 s-1 satisfy 1 < (log?a/log?b) < 1.4.