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US 4,285,909 AGranted
Catalyst assembly for cleaning an exhaust gas
AssigneeToyota Jidosha Kogyo Kabushiki Kaisha
InventorsShinichiro Mizusawa, Hideaki Akamatsu, Fumiyoshi Noda, Yuji Watanabe
Life of this patent
Estimating the term…
Abstract
This invention relates to a catalyst assembly for cleaning an exhaust gas wherein the catalyst and the carrier therefor are secured inside a catalyst muffler by means of expandable ceramic material. This invention also provides a method for making such a catalyst assembly.
Claims8
An assembly comprising in combination
- (a) an outer casing in the form of a hollow tube having gas inlet and gas outlet sections,
- (b) a honeycomb type catalyst unit mounted within said outer casing, the outer walls of said catalyst unit being located a spaced distance inwardly from the interior walls of said outer casing so as to form an annular space therebetween, said catalyst unit having passageways extending therethrough to accommodate the flow of engine exhaust gas into one end and out of the other,
- (c) a cured cellular ceramic mass completely filling said annular space between said casing and said catalyst unit, said cellular ceramic mass exerting both an outward force toward the interior walls of said casing and an inward force against the exterior walls of said catalyst unit by virtue of the fact that an uncured cellular ceramic mass was introduced into said annular space and then expanded in situ and cured in situ after introduction into said annular space.
Dependencies are inferred from the claim text.