US 5,214,253 AGranted

Automotive exhaust system

OwnerRichard G. Houston, Jr.inventor

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Abstract

An improved automotive exhaust system comprises a flared expansion chamber having two inlet ports at its narrow end and three outlet ports at its wide end. The inlet ports extend a predetermined distance into the chamber to form therein a pair of lips that function as dams against migration of reversion pulses back up the exhaust pipes. The total area provided by the outlet ports is greater than that provided by the inlet ports. Exhaust gases fed to the chamber can thereby expand as they traverse the length of the chamber and can pass freely from the chamber through the outlet ports. Reversion pulses, which tend to migrate toward the inlet ports along the interior surface of the chamber, encounter and are reflected by the reversion dams and thus are inhibited from migrating back up the exhaust pipes to the engine. Engine performance and usable power is thereby enhanced.

Claims1

Dependent claims

For use with an engine having an exhaust system that includes at least one exhaust pipe coupled to receive exhaust gases from the engine and direct them away from the engine, an apparatus for reducing back pressure within the exhaust system and inhibiting reversion pulses from migrating through the exhaust pipe to the engine, said apparatus comprising:

an expansion chamber having an inlet end and an outlet end;
at least one inlet port communicating with said expansion chamber at its inlet end with said inlet port being adapted to be coupled to receive exhaust gases from said exhaust pipe;
at least one outlet port communicating with said expansion chamber at its outlet end;
said inlet port defining an inlet area and said outlet port defining an outlet area and wherein the ratio of said outlet area to said inlet area is greater than one;
means within said expansion chamber for intercepting reversion pulses moving toward said inlet port and inhibiting the pulses from entering the inlet port and thereby migrating back through the exhaust pipe to the engine;
said expansion chamber being configured to flair outwardly from its inlet end to its outlet end;
and
said expansion chamber being generally trapezoidal in shape with the inlet end of said expansion chamber being the narrow end thereof and with the outlet end of said expansion chamber being the wide end thereof.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/605,104Filed 26 Oct 1990
Granted: 25 May 1993
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F01N 13/08
Exhaust or silencing apparatus characterised by constructional features: other arrangements or adaptations of exhaust conduits
F01N 1/08
Silencing apparatus characterised by method of silencing: by reducing exhaust energy by throttling or whirling
F01N 2260/06
Exhaust treating devices having provisions not otherwise provided for: for improving exhaust evacuation or circulation, or reducing back-pressure
F01N 2470/14
Structure or shape of exhaust gas passages, pipes or tubes: plurality of outlet tubes, e.g. in parallel or with different length