Muffler

Details Muffler Muffler

1989-02-03

1990-11-20

Fuller, Benjamin R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181265, 181272, 181282, F01N 108

Patent

active

049711660

ABSTRACT:
A muffler for an internal combustion engine comprises: a communicating passage constituting member allowing a plurality of chambers formed by partitioning walls inside an outer shell to be communicated with each other; and a butterfly-type valve provided in the communicating passage. The communicating passage constituting member is formed into the shape of a gutter so as to face either an inner surface of the outer shell at an open side of the constituting member or an outer surface of the outer shell at an open side of the constituting member. Alternatively, the communicating passage constituting member is constituted by a pipe and is provided in the outer shell. The arrangement makes it possible to improve the engine output, reduce the back pressure, and enhance the sound-damping effect.

REFERENCES:
patent: 1403614 (1922-01-01), Malsack
patent: 2072372 (1937-03-01), Kingstey
patent: 2404589 (1946-07-01), Monaghan
patent: 3620330 (1971-11-01), Hall

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