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US 4,186,172 AGranted
Monolithic catalytic muffler having nondeposit welds
AssigneeAudi NSU Auto Union Aktiengesellschaft
InventorRainer Scholz
Life of this patent
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Abstract
A catalytic muffler is formed by winding together a pair of relatively thin catalytically active foils one of which is corrugated. The wound-together foils are secured together by nondeposit welding to form a rigid insert having longitudinally throughgoing gas passages. This insert is then fitted into a cylindrical housing and welded to the housing once again using a beam-type welder.
Claims13
A catalytic muffler comprising:
- a first metal foil;
- a second metal foil wrapped with said first foil and forming therewith a plurality of throughgoing gas passages, said foils contacting each other at a multiplicity of locations, at least one of said foils being catalytically active;
- nondeposit welds between said foils at a plurality of said locations uniting said foils into a monolithic and rigid insert;
- a housing snugly surrounding and contacting said insert;
- and
- nondeposit welds between said housing and said insert fixing same rigidly together.
3 more elements
A method of making a catalytic muffler comprising the steps of:
- wrapping together a pair of catalytically active metal foils into a body having a plurality of throughgoing gas passages with said foils in contact with each other between said passages at a multiplicity of locations;
- nondeposit welding together said foils at a plurality of said locations to form same body into a rigid insert by advancing said foils adjacent a fixed-beam welder;
- and
- fitting said insert into a housing and rigidly securing same therein.
1 more element
Dependencies are inferred from the claim text.