Engine exhaust apparatus

Details Engine exhaust apparatus Engine exhaust apparatus

1990-02-23

1991-06-25

Fuller, Benjamin R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181256, 181265, 181266, F01N 102, F01N 110

Patent

active

050258907

ABSTRACT:
An engine exhaust including a silencer which has a cylindrical shell, a front and a rear end plate which are provided to close both ends of the cylindrical shell, and at least three partition walls to divide an inside space of the silencer into a plurality of chambers, i.e. at least a first chamber, a second chamber, a third chamber and a fourth chamber. An inlet pipe which bypasses at least the first and the second chambers, and connects the front end and the third chamber. The inlet pipe has a plurality of small holes which face toward the first and the second chambers. The small holes facing the second chamber are surrounded by a sound absorber. An outlet pipe bypasses at least the second, the third and the fourth chambers and connects the first chamber and the rear end plate. The outlet pipe has a plurality of small holes which face toward the third and the fourth chambers. The small holes facing the fourth chamber are surrounded by a sound absorber.

REFERENCES:
patent: 3771315 (1973-11-01), Scott
patent: 4192401 (1980-03-01), Deaver et al.
patent: 4393956 (1983-07-01), Tsukui et al.
patent: 4580656 (1986-04-01), Fukuda
patent: 4589517 (1986-05-01), Fukuda
patent: 4637491 (1987-01-01), Fukuda

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