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US 5,096,446 AGranted
Exhaust silencer unit for propulsion unit
AssigneeSanshin Kogyo Kanushiki Kaisha
InventorsHiroshi Tazaki, Kazumasa Ito, Atsushi Sugawara
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AssigneeSanshin Kogyo Kanushiki Kaisha
InventorsHiroshi Tazaki, Kazumasa Ito, Atsushi Sugawara
Estimating the term…
A number of embodiments of exhaust silencers for marine propulsion units including an exhaust device having a first expansion chamber, a pair of second expansion chambers and a third expansion chamber all formed within a common housing. The flow of exhaust gases is from the exhaust of the engine into the first expansion chamber, directly from the first expansion chamber into each of the pair of second expansion chambers and directly from the second expansion chambers to the third expansion chamber. In all embodiments the flow from the second expansion chambers to the third expansion chamber is in confronting relationships so as to improve silencing. In one embodiment, the second expansion chambers have different effective volumes so as to provide an extended range of tuning for the silencing.
An exhaust silencer for exhaust gases of an internal combustion engine comprising a common housing defining a first expansion chamber, an exhaust inlet for delivering exhaust gases from said engine into said first expansion chamber, a pair of spaced apart second expansion chambers, restricted flow means for communicating said first expansion chamber directly with each of said pair of second expansion chambers for successive expansion contraction and expansion of the exhaust gases flowing therebetween, a third expansion chamber, restricted flow means communicating each of said second expansion chambers directly with said third expansion chamber for successive expansion contraction and expansion of the exhaust gases flowing therebetween, and means for discharging exhaust gases from said third expansion chamber to the atmosphere, said pair of second expansion chambers being disposed on and extending along opposite sides of said third expansion chamber.
An exhaust silencer for exhaust gases of an internal combustion engine comprising a first expansion chamber, an exhaust inlet for delivering exhaust gases from said engine into said first expansion chamber, a pair of spaced apart second expansion chambers, means for communicating said first expansion chamber directly with each of said pair of second expansion chambers, a third expansion chamber disposed between said pair of second expansion chambers, means communicating each of said second expansion chambers directly with said third expansion chamber, and means for discharging exhaust gases from said third expansion chamber to the atmosphere, said expansion chambers all being formed in a common housing with the first expansion chamber disposed adjacent one side of said pair of second expansion chambers and said third expansion chamber, said means for communicating said first expansion chamber with said pair of second expansion chambers comprise a pair of apertures formed in a wall separating the first expansion chamber from the second expansion chambers at the upper end thereof.
An exhaust silencer for support as a unit within a hull of a watercraft for silencing exhaust gases of a separate internal combustion engine supported within the hull at a location spaced from said exhaust silencer comprising a first expansion chamber, an exhaust inlet for delivering exhaust gases into said first expansion chamber, flexible conduit means for delivering exhaust gases from said inlet across said hull to said exhaust inlet, a pair of spaced apart second expansion chambers, means for communicating said first expansion chamber directly with each of said pair of second expansion chambers, a third expansion chamber, means communicating each of said second expansion chambers directly with said third expansion chamber, said expansion chambers all being formed in a common housing, and conduit means for discharging exhaust gases from said third expansion chamber to the atmosphere through the hull of said watercraft.
Dependencies are inferred from the claim text.