초록 ▼

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 t

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. The gases exit the muffler to the atmosphere through an outer chamber surrounding the inner chamber. A method of assembling the component parts of the insert is also described.

대표청구항 ▼

In a muffler useful for attenuating the sounds of an internal combustion engine including an axially extending housing having an inlet adapted to be connected to an exhaust pipe in communication with the engine, and an outlet, the improvement comprising: an inner chamber adapted to receive exhaust g

In a muffler useful for attenuating the sounds of an internal combustion engine including an axially extending housing having an inlet adapted to be connected to an exhaust pipe in communication with the engine, and an outlet, the improvement comprising: an inner chamber adapted to receive exhaust gases moving in an axial direction, said inner chamber including means for redirecting the flow of gases from the axial direction into a radially outward direction, and a plurality of annular acoustical reflectors axially spaced from one another to form open passageways for the radial flow of exhaust gases from the inner chamber into an outer chamber defined by said housing and said inner chamber, each reflector including at least one sound reflection surface radially outwardly of said inner chamber and extending into each open passageway whereby sound waves are reflected from each of said surfaces to cause attenuation of the sound, each of said sound reflection surfaces forming an angle of 45°or less with respect to the axis of the muffler.