Engine exhaust noise suppressor

Details Engine exhaust noise suppressor Engine exhaust noise suppressor

1998-02-13

1999-11-16

Dang, Khanh

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181265, 181272, F01N 100

Patent

active

059840455

ABSTRACT:
The inner area of a muffler of an engine is partitioned into an expansion chamber, a first volume chamber and a second volume chamber. An inlet tube and the first volume chamber are connected by a first passage. The first volume chamber and a second volume chamber are connected by a second passage, and the second volume chamber and expansion chamber are connected by a third passage. The flow of exhaust gas reaching the expansion chamber via the first passage, second passage and third passage is blocked by a valve which opens according to a pressure rise of the exhaust gas. One of the two acoustic paths formed when the valve is open functions as a resonator having two degrees of freedom relative to the other path so that a high muffling effect is obtained.

REFERENCES:
patent: 4971166 (1990-11-01), Hase
patent: 5614699 (1997-03-01), Yashiro et al.
patent: 5801343 (1998-09-01), Suzuki et al.

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