Exhaust silencer apparatus for internal combustion engine

Patent · Tue Sep 06 04:00:00 EDT 1977

OSTI ID:5350592

Shaikh, N

A tuned pipe exhaust for a two cycle internal combustion engine for snowmobiles and the like includes a conically shaped converging megaphone section terminating in a small end tube. An absorptive spiral muffler unit is co-axially secured to the end tube and includes an inner radial end wall extending radially from the end tube. The muffler unit attenuates high frequency exhaust noise. The space between such end wall and the upstream conical wall of the tuned pipe is enclosed with a tubular resonator wall to define a resonator cavity with a coupling opening in the end tube. The cavity and throat opening defines a Helmholtz resonator which attenuates low frequency exhaust noise. The combination of a low frequency reactive section and a high frequency absorptive section creates an effective balanced silencer operating over the normal frequency spectrum of such engines.

• Assignee: Brunswick Corp.
• Patent Number(s): US 4046219
• OSTI ID: 5350592
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
CAVITY RESONATORS
DESIGN
ENGINES
EXHAUST SYSTEMS
FREQUENCY RANGE
INTERNAL COMBUSTION ENGINES
NOISE POLLUTION CONTROL
PIPES
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
TUBES