Engine intake manifold made of noise barrier composite material

一种共注射成型的进气歧管管壳，包括由一吸声或隔声芯隔开的内外表皮层。每一表皮层由聚酰胺树脂构成，该聚酰胺树脂可选地包括加强玻璃纤维和高比重填料如硫酸钡或钨。该吸声芯由呈泡沫结构的高密度材料如聚酰胺树脂构成。表皮层设置有多个允许在适合增大噪声传输损耗的预定部位上分布局部集中质量的鼓包。还提供了一种厚度不均匀的单层进气歧管管壳。该单层进气歧管管壳的厚度在振幅较大的预定噪声源上较厚，使得标称厚度的进气歧管管壳的噪声衰减最大。 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.