Marine propulsion – Means for accomodating or moving engine fluids – Cooling for engine
Reexamination Certificate
1999-03-01
2001-11-27
Swinehart, Ed (Department: 3617)
Marine propulsion
Means for accomodating or moving engine fluids
Cooling for engine
Reexamination Certificate
active
06322409
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a personal watercraft and more particularly to an improved injection system for such watercraft.
There are a large number of personal watercraft in service. For the most part, these personal watercraft are powered by internal combustion engines and are subject to the same demands for more efficient fuel consumption and better combustion control and exhaust emission control as other engine applications. However, watercraft and particularly the small type of watercraft referred to as “personal watercraft” presents some unique problems in connection with exhaust emission control and fuel economy.
A frequently relied upon source of improving engine performance without deteriorating fuel economy or exhaust emission control is fuel injection. The fuel can be injected either directly into the combustion chamber or into the intake system for ingestion into the combustion chamber along with the intake air charge. Regardless of the type of injection employed, it is very important that the fuel be injected in such a way that it does not impinge to a significant extent on the engine walls where it might condense and collect. This condition can result in erratic fuel delivery and incomplete combustion.
This problem is particularly significant in connection with watercraft and particularly personal watercraft because these types of vessels frequently have their trim or pitch conditions changed significantly. Side-to-side rocking also can be quite extreme and thus, the angle of the fuel injector can vary considerably when the water vehicle travels along its path.
Thus, these various orientations which can be experienced can result in improper fuel delivery and improper or inadequate mixing of the fuel with the air, particularly when fuel injection is employed.
It is, therefore, a principal object of this invention to provide an improved fuel injection system for a personal watercraft engine.
It is a further object of this invention to provide an improved fuel injection system wherein the fuel injectors are mounted so that the portion of the engine into which they spray and this relationship will be such that the fuel is not likely to impinge on the walls of the area bounded by the area where the fuel is injected regardless of the disposition of the watercraft.
It is, therefore, the principal object of this invention to provide an improved fuel injection system for a personal watercraft.
SUMMARY OF THE INVENTION
This invention is adapted to be embodied in a personal watercraft having a hull that defines an engine compartment in which an internal combustion engine is positioned. This engine drives a propulsion device for the watercraft through an appropriate transmission. The engine includes an engine body having an opening into which a fuel injector injects. The fuel injector is positioned so that its spray axis is oriented so that it is not likely to intersect the walls of the engine that define the opening regardless of the angular position of the watercraft in the body of water in which it is operating.
REFERENCES:
patent: D. 237956 (1975-12-01), Naito et al.
patent: 4768983 (1988-09-01), Smith
patent: 5284111 (1994-02-01), Geyer et al.
patent: 5699766 (1997-12-01), Saito
patent: 5762040 (1998-06-01), Taipale et al.
Hattori Toshiyuki
Nanami Masayoshi
Beutler Ernest A.
Swinehart Ed
Yamaha Hatsudoki Kabushiki Kaisha
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