Multi-layer tube of a muffler for an internal combustion engine
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United States of America Patent
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Jul 25, 1989
Issued Date -
N/A
app pub date -
Jun 13, 1988
filing date -
Oct 2, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A tube of a muffler for an internal combustion engine includes at least two generally rectangular sheets which are joined together at one end by crimping and wound in a tubular configuration to constitute two consecutive layers. In the tubular configuration, the other end of each of the two sheets overlaps the sheet itself and welded to the latter straddling a coupling portion where the two sheets are joined. While one of the sheets which constitutes an inner layer of the tube is made of a material which is resistive to corrosion due to chemical reactions with combustion gas and others flowing through the tube, the other which constitutes an outer wall of the same is made of a material which withstands adverse ambient conditions such as briny air and high humidity.
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