Patent ID: 7296551

Claim:
An intake manifold, comprising: a main body section and a duct component member which is fabricated by integrally molding multiple tubular bodies having a sectional shape in circular arc form which are arranged parallel; the duct component member being welded to a surface of the main body section, whereby multiple ducts for feeding air to each cylinder of an engine which are arranged parallel are formed; inlets of each of the ducts being disposed by being arrayed on a same surface in a funnel section which is formed in a communication space section which communicates with the ducts to feed introduced air thereto; a surface of the funnel section being formed, at each of the inlets of the duct, by a smooth curved surface which is widened toward the communication space section and this curved surface being continuously connected to an inner circumferential surface of each of the ducts, wherein by providing mating surfaces of the main body section and the duct component member off the funnel section, this funnel section is formed from a single member only in the main body section.