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US 6,334,981 B1Granted
Double-walled housing, in particular for exhaust gas catalytic converters of motor vehicles and method of producing a double-walled housing
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A double-walled housing, in particular for exhaust gas catalytic converters of motor vehicles, includes an inner jacket and an outer jacket approximately concentrically surrounding and spaced apart from the inner jacket. The inner and outer jackets rest tightly against one another at both end surfaces. The inner jacket is kept under compressive strain at least at two end regions by constrictions of the outer jacket. The outer jacket has embossed features oriented toward the inner jacket. The housing is produced by deforming the inner jacket by rolling a metal sheet into cylindrical or conical form while maintaining a parting line. The outer jacket is deformed by rolling a metal sheet into cylindrical or conical form and by connecting mutually meeting edges by a joining technique. The inner jacket is disposed in the outer jacket and the outer jacket is plastically deformed inward over its entire circumference on both end surfaces in such a way that the inner jacket is kept under compressive strain. The outer jacket is provided beforehand or simultaneously with embossed features oriented toward the inner jacket.
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