Sound attenuating device and insert
US5659158A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 1995 |
| Grant date | Aug 19, 1997 |
| Priority date | — |
| Expiry date | Feb 17, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N13/18
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A sound attenuating muffler useful with an internal combustion engine, preferably for marine applications, contains an insert comprising an arrangement of annular sound reflecting surfaces defining an inner chamber into which engine exhaust gases flow in a first direction and one or more directors to divert the axial flow of gases and sound waves in a second direction past these sound reflecting surfaces. As the sound waves are reflected off of these surfaces back into the muffler interior, attenuation of the sound is achieved. One or more additional inserts may be placed downstream from the first insert for additional sound attenuation. Each of the inserts may be in the form of discrete sound reflector rings or as a continuous helix. A method of assembling the component parts of the insert is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.