Peter Y Han

US Patent:

20030062012, Apr 3, 2003

Filed:

Sep 21, 2001

Appl. No.:

09/960157

Inventors:

Emile Homsi - Union NJ, US
Thomas Krolick - Parlin NJ, US
Chul Lee - Northville MI, US
Peter Han - Montville NJ, US
Val Kagan - Morristown NJ, US

International Classification:

F02M035/10

US Classification:

123/184210

Abstract:

A co-injection molded air intake manifold shell comprises an inner and outer skin layer separated by a sound absorbing or sound insulation core. Each skin layer is composed of a polyamide resin which, optionally, contains glass fiber reinforcement and high specific gravity fillers such as barium sulfate or tungsten. The sound insulating core is composed of a high density material having a foam structure, such as a polyamide resin. Skin layers are provided with a plurality of pockets to permit distribution of localized lumped masses at predetermined locations tailored to increase noise transmission losses. A single layer air intake manifold shell having non-uniform thickness is also provided. The thickness of the single layer air intake manifold shell is larger over preselected noise sources of larger amplitude to maximize noise attenuation for a nominal air intake manifold shell thickness.