Marine engine exhaust muffler

Details Marine engine exhaust muffler Marine engine exhaust muffler

1993-06-04

1994-07-12

Gellner, Michael L.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181238, 181239, 181240, 181255, 181269, 181273, 181250, 440 89, F01N 700

Patent

active

053290747

ABSTRACT:
An exhaust muffler for mounting on the transom of a powerboat in association with the exhaust pipes which extend through the transom. The muffler comprises a housing extending laterally across the stern of the boat and rearwardly from the transom to define an interior space. The housing has a floor located below the water line; opposed end walls; a front wall located adjacent to the transom with openings formed therein, through which exhaust gas can pass from the exhaust pipes; a rear wall having exhaust ports formed therein and a cover that encloses the interior space. Located within the enclosed space are muffler inserts secured to the floor and also to the front and rear walls. Each insert has a domed portion defining a muffling chamber that communicates with the respective exhaust pipe, and a second domed chamber defining an expansion chamber that communicates with the respective exhaust port located in the rear wall of the housing. The muffling chamber and the expansion chamber are in communication with one another through a passage located below the water line and defined by a portion of the insert and by the floor of the muffling chamber. Accordingly, exhaust gas introduced into the muffling chamber is forced through the water filled passage into the expansion chamber and then exits through the respective exhaust port.

REFERENCES:
patent: 4744778 (1988-05-01), Porter
patent: 4786265 (1988-11-01), Porter
patent: 4977977 (1990-12-01), von Widmann et al.

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