Back to results
US 4,997,399 AGranted
Exhaust system for small vessel
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorsYoshikazu Nakayasu, Ryoichi Nakase, Seiji Inoue
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorsYoshikazu Nakayasu, Ryoichi Nakase, Seiji Inoue
Estimating the term…
A small watercraft having a number of embodiments of exhaust systems into which coolant from the engine are discharged and which insure that water cannot enter the exhaust ports in the event the watercraft becomes displaced. In all embodiments, a water accumulating volume surrounds the discharge end of the exhaust pipe within an expansion chamber for trapping water in the event the watercraft becomes displaced from its normal condition and for return of the water therefrom upon erection of the watercraft. In a number of embodiments, gravity operated normally open control valves are also provided for closing the end of the exhaust pipe in the event the watercraft becomes displaced from its normal upright condition so as to insure that water cannot enter the exhaust ports of the engine.
In an exhaust system for a small watercraft having an internal combustion engine with an exhaust port, an exhaust pipe for conveying exhaust gases from said exhaust port to the atmosphere, the improvement comprising gravity operated normally open valve means cooperating with said exhaust pipe for precluding water from flowing to said exhaust port in the event said watercraft is displaced form a normal, upright condition, said gravity operated valve means being moveable to its closed position when said watercraft is displaced from its normal upright condition to close said exhaust pipe from communication with the atmosphere, and means for delivering engine coolant to said exhaust pipe downstream of said gravity operated valve.
In an exhaust system for a small watercraft having an internal combustion engine with an exhaust port, an exhaust manifold for conveying exhaust gases from said exhaust port to a discharge and communicating with an exhaust pipe having an inlet and positioned adjacent and spaced from said discharge, and said exhaust pipe communicating at an outlet end with an expansion chamber, the improvement comprising means defining a water storing volume surrounding the discharge end of said exhaust manifold and said inlet end of said exhaust pipe for accumulating water in the even the watercraft becomes displaced from a normal upright condition and for flow of water accumulated therein back to the expansion chamber upon the watercraft being returned to its normal upright condition.
Dependencies are inferred from the claim text.