Exhaust system
AssigneeEberspächer Exhaust Technology GmbH & Co. KG
InventorGerd Gaiser
Life of this patent
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Abstract
A component of an exhaust system for a combustion engine, particularly of a motor vehicle, which at least in part regions includes a self-supporting jacket. The jacket includes a porous, open-pore or closed-pore cellularly constructed foam. The foam is of a self-supporting design. By using such a foam the insulation of the component can be improved.
Claims20
An internal combustion engine exhaust system component comprising a self-supporting exhaust system component jacket comprising:
- an outer layer comprised of a closed-pore foam or of a non-porous tube, the outer layer forming an exhaust system component jacket outer surface;
- an inner layer inside of the outer layer and adjoining the outer layer, the inner layer comprising porous cellularly constructed open pore foam, wherein the foam of the inner layer is of a self-supporting design;
- and
- a lining layer inside of the inner layer and adjoining the inner layer, the lining layer comprising an open-pore foam wherein the open-pore foam of the lining layer has a smaller pore size than the open-pore foam of the inner layer, the lining layer forming an exhaust system component jacket inner surface.
An internal combustion engine exhaust system comprising:
- an exhaust gas pipe;
- and
- an exhaust component connected to the exhaust gas pipe, the exhaust component comprising a self-supporting exhaust system component jacket comprising a porous cellularly constructed foam, wherein the foam has self-supporting properties and the exhaust system component jacket comprises:
- an outer layer comprising a closed-pore foam or of a non-porous tube, the outer layer forming an exhaust system component jacket outer surface;
- an inner layer inside of the outer layer and adjoining the outer layer, the inner layer comprising porous cellularly constructed open pore foam;
- and
- a lining layer inside of the inner layer and adjoining the inner layer, the lining layer comprising an open-pore foam wherein the open-pore foam of the lining layer has a smaller pore size than the open-pore foam of the inner layer, the lining layer forming an exhaust system component jacket inner surface.
A method for producing a component of an internal combustion engine exhaust system, the method comprising the steps of:
- providing a raw foam compound;
- admixing a foaming agent in different concentrations to the raw foam compound in at least two jacket regions;
- and
- baking of the raw foam compound with two jacket regions so that a component jacket has, in at least the two jacket regions, following the baking, at least one of a different density and a different material thickness to form a self-supporting jacket comprising:
- an outer layer comprising a closed-pore foam or of a non-porous tube, the outer layer forming an exhaust system component jacket outer surface;
- an inner layer inside of the outer layer and adjoining the outer layer, the inner layer comprising a porous cellularly constructed open pore foam;
- and
- a lining layer inside of the inner layer and adjoining the inner layer, the lining layer comprising an open-pore foam wherein the open-pore foam of the lining layer has a smaller pore size than the open-pore foam of the inner layer, the lining layer forming an exhaust system component jacket inner surface.
Dependencies are inferred from the claim text.