VIBRATION DAMPING DEVICE
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United States of America Patent
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app pub date -
Jan 31, 2012
filing date -
Mar 15, 2011
priority date (Note) -
Abandoned
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Abstract
A vibration damping device includes a vulcanized rubber molding and a resin molding. The resin molding includes a sandwiched molding having a core layer and skin layers. The skin layers include a polyamide resin composition (A) containing a polyamide resin (a) and glass fibers (x) with a ratio (a/x) of 40/60 to 75/25 in mass. The core layer includes a polyamide resin composition (B) containing a polyamide resin (b) and glass fibers (y) with a ratio (b/y) of 35/65 to 60/40 in mass. A melt viscosity ηa of the composition (A) at 30° C. higher than the melting point thereof and a shearing speed of 1000 s−1 and a melt viscosity ηb of the polyamide resin composition (B) at 30° C. higher than the melting point thereof and a shearing speed of 1000 s−1 satisfy the expression of:
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