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US 5,346,675 AGranted
Exhaust gas cleaning apparatus
AssigneeUsui Kokusai Sangyo Kabushiki Kaisha
InventorsMasayoshi Usui, Haruo Serizawa
Life of this patent
Estimating the term…
Abstract
An exhaust gas cleaning apparatus comprises one or more honeycomb core bodies for carrying an exhaust gas cleaning catalyst and fitted in a tubular metal casing. The metal casing has an outer wall which is axially expandable and contractible so as to follow the stress due to thermal strains acting on the honeycomb core bodies inside, thereby remarkably improving the apparatus in durability and vibration resistance.
Claims22
An exhaust gas cleaning apparatus comprising:
- a single honeycomb core body carrying thereon an exhaust gas cleaning catalyst and composed of a sheet band made of a thin metal sheet and a corrugated band made from another thin metal sheet, said sheet band and said corrugated band being superposed one over another so as to have areas of contact therebetween and so as to define many network-patterned gas flow passages along a central longitudinal axis thereof;
- and a metal casing having a central axis and being opened at opposite ends, said honeycomb core body being inserted in and fixed directly to said metal casing, said metal casing having an outer wall expandable and contractible axially so as to follow stress due to a thermal expansion of said honeycomb core body.
An exhaust gas cleaning apparatus comprising:
- at least two honeycomb core bodies each carrying thereon an exhaust gas cleaning catalyst and composed of a sheet band made of a thin metal sheet and a corrugated band made from another thin metal sheet, said sheet band and said corrugated band being superposed one over another so as to have areas of contact therebetween and so as to define many network-patterned gas flow passages along a central longitudinal axis thereof;
- and a metal casing having a central axis and being opened at opposite ends, said at least two honeycomb core bodies being arranged in said metal casing, with at least one axial space between said at least two honeycomb core bodies, and fixed directly to said metal casing, said metal casing having an outer wall expandable and contractible axially so as to follow stress due to a thermal expansion of said at least two individual honeycomb core bodies.
Dependencies are inferred from the claim text.