Composite dual tubing
AssigneeNippon Steel Corporation
InventorsTakesada Sasaki, Hiroshi Endo, Yoshimasa Zama, Masahiko Shiraishi, Yosinari Miura, Masayuki Yamaguchi
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Abstract
A steel tubing and more particularly a composite dual tubing which can be suitably used for an exhaust pipe capable of effectively reducing the radiated noise from the exhaust pipe of automobiles. A metallic dual tubing of the present invention comprises: lugs (20a); lugs (20a) and heat-resistant filler material (24); or, the spacer member (16) and the heat-resistant filler member (17).
Claims3
An exhaust pipe for high temperature waste gas from an automobile engine, said exhaust pipe comprising a metal dual tubing characterized in that said metal dual tubing comprises an inner tube and an outer tube which are in contact with each other along substantially the entire longitudinal length of the tubing and further at least one stripe of lug contacts the outer surface of said inner tube and the inner surface of said outer tube, said at least one stripe of lug extending substantially the entire longitudinal direction of the tubing, and said lug is located at the half section of the dual tubing opposite to the half section where the tubes are in contact.
Dependencies are inferred from the claim text.