Muffler for internal combustion engine

Details Muffler for internal combustion engine Muffler for internal combustion engine

1997-12-30

1999-10-26

Dang, Khanh

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181265, 181272, F01N 100

Patent

active

059710985

ABSTRACT:
In a muffler for internal combustion engine which is provided with a valve capable of closing and opening an open end of by-pass inner pipe, the opening and closing operation of the valve is performed via the exhaust gas pressure, without being affected by external factors. Also, the structure is simple and easy to be assembled. On a fixed shaft (36) supported in the vicinity of an open end (28a) of a by-pass inner pipe (28) is a valve (32) rotatably mounted. The valve (32) is urged against the open end (28a) by a coil spring (42), and when fitted in a flange part (38), it closes the open end (28a). When the revolving speed of the internal combustion engine is low, the pressure inside the by-pass inner pipe (28) is smaller than the operative force which is an addition of the urging force by the coil spring (42) and the external pressure. The open end (28a) is therefore closed. On the other hand, when the revolving speed rises and the pressure has increased to a predetermined pressure, their relation is reversed. Specifically, the valve retracts from the open end (28a) thereby placing the by-pass inner pipe (28) in a communicated condition.

REFERENCES:
patent: 2083516 (1937-06-01), Horton
patent: 3620330 (1971-11-01), Hall
patent: 4484659 (1984-11-01), Buchwalder

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