Muffler for two-cycle internal combustion engine and method of a

Details Muffler for two-cycle internal combustion engine and method of a Muffler for two-cycle internal combustion engine and method of a

1994-08-04

1995-09-19

Dang, Khanh

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181231, 181282, F01N 302

Patent

active

054517281

ABSTRACT:
A muffler for a two-cycle internal combustion engine used to power lawn and garden equipment includes two mating shells and two plates, sandwiching a spark arrestor screen, are disposed between the shells to form first and second expansion chambers between each plate and the adjacent shell. The first chamber includes an opening for coupling to the exhaust port of the engine. Within one plate is stamped a first depression, a baffle within that depression, and an elongated depression separate from the first depression. In the other plate is stamped a second depression that is punched with an air passage. When mated, an attenuating tube having an entrance in the second of the two expansion chambers and an exit into the atmosphere is formed. The first and second depressions cooperate to expose a large area of the spark arrestor screen to a flow of exhaust gas from the first chamber, through the baffle and into the second chamber. The exhaust gas in the second chamber exits the muffler through the attenuating tube.

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