Exhaust subsystem with polymer housing
AssigneeNOVO Plastics Inc.
InventorBaljit Sierra
Life of this patent
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Abstract
A vehicle exhaust system includes a subsystem having an exterior pipe formed of a polymer. A rigid liner extends along the length of the exterior pipe and defines a passageway. A fiber insulating layer is formed between the rigid liner and the exterior pipe. The liner is formed to define at least one groove circumscribing the periphery of the passage-way. The groove defines a region of increased volume of the exhaust passage along the length. The liner is further formed to define at least one void extending between the wall of the liner and the insulating layer, around the periphery of the passageway. A plurality of apertures in the liner, allow sound waves to pass from the passageway into the fiber insulating layer, and into the void.
Claims25
An exhaust subsystem comprising:
- an exterior pipe comprising polymer, for carrying gases from an engine;
- a rigid liner within said exterior pipe, extending along said length, defining a passageway;
- a fiber insulating layer formed between said rigid liner and said exterior pipe;
- wherein said liner is formed to define at least one groove circumscribing the periphery of said passageway, said at least one groove defining a region of increased volume of said passageway along said length;
- wherein said liner is further formed to define at least one void extending between the wall of said liner and said insulating layer, around the periphery of said passageway;
- and
- wherein said liner comprises a plurality of apertures, allowing sound waves to pass from said passageway into said fiber insulating layer, and into said at least one void extending around the periphery of said passageway.
The exhaust subsystem of claim 22, wherein said exterior pipe is injection molded as a hinged clam shell.
An exhaust subsystem comprising:
- an exterior pipe comprising polymer, defining an exhaust passage along a length of said exterior pipe, for carrying gases from an engine;
- a rigid liner within said exterior pipe, extending along said length, defining a passageway;
- a fiber insulating layer formed between said rigid liner and said exterior pipe;
- wherein said liner is formed to define at least one void extending between said liner and said insulating layer, around the periphery of said passageway;
- wherein said liner comprises a plurality of apertures, allowing sound waves to pass from said exhaust passage into said fiber insulating layer, and into said at least one void extending circumferentially around said passage.
Dependencies are inferred from the claim text.