Method for manufacturing a catalytic reactor carrier matrix
AssigneeSuddeutsche Kuhlerfabrik Julius Fr. Behr GmbH & Co. KG
InventorsManfred Nonnenmann, Heinrich Oltmanns, Manfred Hohhausel
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Abstract
A carrier matrix for use in the manufacture of a catalytic reactor for the purification of exhaust gases in an internal combustion engine of a motor vehicle is prepared by joining in wound form a corrugated steel sheet and a generally flat steel sheet, the sheets being joined in locations where they contact one another by the use of solder or brazing material. In one embodiment solder is applied in spots along the tops of the arches of the corrugated sheet, and after coiling the solder is activated by heating. In another embodiment, coiling is first carried out and then soldering is accomplished by the application of solder into one or both end faces of the coil.
Claims12
In a method for manufacturing a carrier or supporting matrix for a catalytic reactor designed for cleaning or purifying the exhaust gases in an internal combustion engine of a motor vehicle, the reactor comprising high temperature resistant steel sheets coated with a catalyst material, said steel sheets comprising a first relatively flat sheet and a second corrugated sheet alternately disposed in layers, the individual layers of the steel sheets being soldered together, the improvement comprising:
- (a) coiling the flat and the corrugated steel sheets to form a cylindrical honeycomb element;
- (b) degreasing and/or staining the honeycomb element;
- (c) uniformly applying a predetermined amount of solder to one or both end faces of the wound-up honeycomb element so that solder is present only in the vicinity of the end faces and a substantial length of the honeycomb element intermediate the end faces is free of solder;
- and
- (d) thereafter simultaneously soldering together all the layers with respect to each other by heating up the matrix with soldering taking place only in the vicinity of the end faces.
Dependencies are inferred from the claim text.