US Patent 7198017 Intake noise suppressor

An intake manifold 10 in the air intake tract of an internal combustion engine which has a main flow cross section 14 between an oncoming flow side 12 and an outgoing flow side 13. At least one resonator chamber 23 is arranged on the circumference of the main flow cross section 14 in communication with the main flow cross section 14. The resonator chamber 23 is surrounded by side walls 30 and closed by a cover 28, with the side walls 30 of the resonator chamber 23 and the wall 15 forming the main flow cross section 14 being manufactured together in one piece. A parting plane 31 situated between the cover 28 and the side walls 30 of the resonator chamber 23 is arranged outside of the wall 15 forming the main flow cross section 14.