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AssigneesAichi Kikai Kogyo Kabushiki Kaisha, Sanoh Kogyo Kabushiki Kaisha
InventorsMasatoshi Hada, Yasuo Sunaga
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An air-intake manifold includes a plurality of air-intake pipes connecting between a collector and an air-intake pipe mount. Each air-intake pipe 3 is bent to have a predetermined shape. Each air-intake pipe 3 is fabricated by bending a substantially straight double metal pipe that has an outer pipe 3a and an inner pipe 3b with a clearance 3c therebetween equal to or less than 0.2 mm, such that the outer pipe 3a and the inner pipe 3b locally contact with each other at an intermediate region. Accordingly, while the outer pipe 3a and the inner pipe 3b of the air-intake pipe 3 locally contact with each other at the contact point 3e (in the relatively slidable relationship), an air layer having a thickness equal to or less than about 0.2 mm is formed between the outer pipe 3a and the inner pipe 3b at portions except for the contact point 3e.
An air-intake manifold for an internal combustion engine comprising a collector, an air-intake pipe mount and a plurality of air-intake pipes connecting between the collector and the air-intake pipe mount, wherein each air-intake pipe is fabricated by bending a substantially straight double metal pipe with smooth pipe surfaces that includes an outer pipe and an inner pipe having different natural frequencies from each other and having a clearance equal to or less than 0.2 mm therebetween, such that the outer pipe and the inner pipe locally slidably contact with each other at an intermediate region, and wherein the outer pipe and the inner pipe are joined at both ends to each other by brazing.
Dependencies are inferred from the claim text.