Silencer for outboard motor
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorsNoriyoshi Hiraoka, Masaki Okazaki
Life of this patent
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Abstract
A protective cowling and air silencing device for the power head of a watercraft propulsion unit. The cowling is provided with an atmospheric air inlet opening, and a duct is provided internally in the cowling for assisting in water separation by directing the inlet air downwardly toward a drain opening. The engine is provided with charge formers that have an air silencing device that is provided with at least one resonating chamber on the side of the charge former and which communicates with a delivery passage of the device through a tuning neck for silencing purposes.
Claims17
A watercraft propulsion device comprised of an internal combustion engine having at least one charge former for delivering a fuel-air charge to said engine, a protective cowling enclosing said engine, an atmospheric air inlet in said protective cowling for admitting air into the interior of said protective cowling, and an air silencer for receiving said air, silencing said air, and delivering said air to said charge former, said air silencer being comprised of an outer housing defining an air inlet disposed above said charge former, a delivery section extending downwardly from said air inlet to an inlet opening of said charge former, a resonance chamber of predetermined volume at one side of said charge former, and a tuning neck connecting said resonance chamber with said delivery section.
A watercraft propulsion device comprised of an internal combustion engine having at least one charge former for delivering a fuel-air charge to said engine, a protective cowling enclosing said engine, an atmospheric air inlet in an upper portion of said protective cowling for admitting air to the interior of said protective cowling, an air silencer for receiving air, silencing air, and delivering air to said charge former, and an air delivery duct formed internally of said protective cowling and having an inlet end in communication with said cowling air inlet and extending downwardly and terminating at a discharge opening positioned above a lower portion of said protective cowling.
Dependencies are inferred from the claim text.