Reinforced plastic air inlet manifold

The utility model relates to a reinforced plastic air inlet manifold and aims to overcome the defects that the partial vibration in the middle of the upper surface of an existing air inlet manifold is evident, resonance and a partial breathing mode easily occur in the total rotation speed range of an engine, and large noises are generated in the prior art. The reinforced plastic air inlet manifold comprises a branch pipe shell and a resonance cavity shell. The shell wall thickness of the top of the resonance shell gradually increases from the edge to the middle. Hexagonal recesses distributed in a honeycomb structure are formed in the outer surface of the top of the resonance cavity shell. A sound absorption pad is laid on the surface of the honeycomb structure. One side, facing the resonance cavity shell, of the sound absorption pad is provided with hexagonal bosses matched with the honeycomb structure, and wrinkles are disposed along the interval of adjacent bosses. The reinforced plastic air inlet manifold has the advantages that the partial breathing mode of the resonance cavity shell is increased, the sound absorption pad absorbs sound and reduces noises, resonance during operation is avoided, and the noises of the air inlet manifold is reduced effectively.