Exhaust silencer for internal combustion engines

Details Exhaust silencer for internal combustion engines Exhaust silencer for internal combustion engines

1986-03-13

1987-12-15

Fuller, Benjamin R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181256, 181268, 181272, 181275, F01N 110

Patent

active

047126442

ABSTRACT:
An exhaust silencer for internal combustion engines, particularly as used on motor vehicles including tractors. A front pipe, a plurality of core tubes and a tail pipe have successive inner flow channels of equal section areas. The plurality of core tubes are integrally connected to the larger end of a trumpet pipe. The walls of the core tubes are punched with flanged holes forming converging passages. Flow-dividing plates are provided in the tail pipe. The exhaust flow divides into smaller substreams on passing through the front pipe and the core tubes, thus raising the ratio of expansion, leading to a decrease in noise level and exhaust back pressure, while reducing engine output loss. The noise level of a vehicle can be reduced to 80-83 dB(A), while oil consumption is reduced by 6-8.8%.

REFERENCES:
patent: 1740805 (1929-12-01), Brice
patent: 2019697 (1935-11-01), Smith
patent: 4180141 (1979-12-01), Judd
patent: 4203503 (1980-05-01), Franco et al.
patent: 4209076 (1980-06-01), Franco et al.
patent: 4392549 (1983-07-01), Wrobel et al.

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