Muffler for an internal combustion engine

Details Muffler for an internal combustion engine Muffler for an internal combustion engine

1994-10-27

1996-03-12

Dang, Khanh

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181265, 60299, 60302, F01N 302

Patent

active

054988420

ABSTRACT:
A muffler for a two-stroke internal combustion engine having a housing and a partition wall which cooperate to define a first chamber adjacent an engine exhaust port and a second chamber remote from the engine. A catalyzer element is housed within the second chamber. A discharge pipe extends from an outlet of the catalyzer element and through the first chamber to atmosphere. An outer pipe surrounds a portion of the discharge pipe within the first chamber and cooperates therewith to define a passage whereby exhaust gas within the first chamber is directed through the partition wall and into the second chamber. Heat from the treated exhaust gas flowing through the discharge pipe is transferred to the exhaust gas flowing through the passage to preheat the exhaust gas prior to reaching the catalyzer element, thereby reducing the time required to bring the catalyzer element to an operating temperature following engine start-up.

REFERENCES:
patent: 4867270 (1989-09-01), Wissmann et al.
patent: 4890690 (1990-01-01), Fischer et al.
patent: 5043147 (1991-08-01), Knight
patent: 5048290 (1991-09-01), Lavenius et al.
patent: 5338903 (1994-08-01), Winberg

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