Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1977-05-31
1978-08-22
Watson, Robert C.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
F01N 104
Patent
active
041082753
ABSTRACT:
The improved engine exhaust gas muffler of the invention comprises an outer hollow tubular elongated shell having a gas inlet and a gas outlet at opposite ends thereof, and a hollow perforated tubular extension secured to the inlet end of the shell and extending part way along the length of the shell substantially coaxially therewith. A hollow perforated insert substantially coaxial with the shell and having an upstream end slip fitted within the downstream end of the extension and a downstream end either connected to the shell gas outlet or fitted within a lower extension is also provided. The insert's upstream end has a terminal portion of smaller diameter than the main body of the insert so as to form with the extension downstream end means for diverting exhaust gases flowing through the muffler into a plurality of paths for better sound attenuation, and also a pocket for the accumulation of solid particles from exhaust gases without plugging of said paths.
Sound deadening, preferably heat insulating, means are disposed in the shell around the exterior of the extension and also that portion of the insert which is outside of the extension. The slip fit between the extension and insert permits heat expansion of these components without degrading the muffler. The muffler is inexpensive and has improved sound deadening properties and improved durability.
REFERENCES:
patent: 2646854 (1953-07-01), Walker
patent: 3765506 (1973-10-01), Strunk
patent: 3884655 (1975-05-01), Coop
Black William M.
McCallum R. Bruce
Posta Jr. John J.
Watson Robert C.
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