Double-walled housing, in particular for exhaust gas catalytic converters of motor vehicles and method of producing a double-walled housing
First Claim
1. A double-walled housing, comprising:
- an inner jacket having two at least elastically deformed end regions; and
an outer jacket approximately concentrically surrounding said inner jacket at a spacing, said outer jacket having constrictions at said two at least elastically deformed end regions tightly resting against said inner jacket and keeping said inner jacket under compressive strain at least at said two at least elastically deformed end regions, and said outer jacket having embossed features oriented toward said inner jacket; and
said constrictions of said outer jacket and said two at least elastically deformed end regions of said inner jacket forming compression joint structures for securing said inner jacket in said outer jacket.
1 Assignment
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Accused Products
Abstract
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.
33 Citations
23 Claims
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1. A double-walled housing, comprising:
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an inner jacket having two at least elastically deformed end regions; and
an outer jacket approximately concentrically surrounding said inner jacket at a spacing, said outer jacket having constrictions at said two at least elastically deformed end regions tightly resting against said inner jacket and keeping said inner jacket under compressive strain at least at said two at least elastically deformed end regions, and said outer jacket having embossed features oriented toward said inner jacket; and
said constrictions of said outer jacket and said two at least elastically deformed end regions of said inner jacket forming compression joint structures for securing said inner jacket in said outer jacket. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A catalytic converter, comprising:
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a double-walled housing having a cylindrical interior, an inner jacket having two at least elastically deformed end regions, and an outer jacket approximately concentrically surrounding said inner jacket at a spacing, said outer jacket having constrictions at said two at least elastically deformed end regions tightly resting against said inner jacket and keeping said inner jacket under compressive strain at least at said two at least elastically deformed end regions, and said outer jacket having embossed features oriented toward said inner jacket;
said constrictions of said outer jacket and said two at least elastically deformed end regions of said inner jacket forming compression joint structures for securing said inner jacket in said outer jacket; and
a catalyst carrier disposed in said cylindrical interior.
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23. A catalytic converter, comprising:
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a double-walled housing having a conical interior, an inner jacket having two at least elastically deformed end regions, and an outer jacket approximately concentrically surrounding said inner jacket at a spacing, said outer jacket having constrictions at said two at least elastically deformed end regions tightly resting against said inner jacket and keeping said inner jacket under compressive strain at least at said two at least elastically deformed end regions, and said outer jacket having embossed features oriented toward said inner jacket;
said constrictions of said outer jacket and said two at least elastically deformed end regions of said inner jacket forming compression joint structures for securing said inner jacket in said outer jacket; and
a catalyst carrier disposed in said conical interior.
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Specification