Cooling system for watercraft
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorMasayoshi Nanami
Life of this patent
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Abstract
An engine for a watercraft has a coupling plate interposed between a cylinder block and an exhaust manifold. The coupling plate comprises exhaust passages that complement the shapes of cylinder exhaust discharge ports and the exhaust manifold inlet ports. The coupling plate also includes a water jacket for use with a water cooling system. The cooling system can receive coolant from a pressure chamber within a jet pump unit of the watercraft. The cooling system also can include a lubricant cooler that receives coolant from an engine cooling jacket, an exhaust system cooling jacket or another cooling jacket.
Claims13
A watercraft comprising an engine, an exhaust manifold, and a coupling plate joining the exhaust manifold to the engine, the engine comprising at least one exhaust discharge port, the exhaust discharge port having a first shape, the exhaust manifold having at least one exhaust inlet port, the exhaust inlet port having a second shape, the coupling plate having at least one exhaust passage therethrough, the exhaust passage having a first end and a second end, the first end shaped to match the first shape and the second end shaped to match the second shape, wherein a cooling jacket is defined within the coupling plate such that the cooling jacket is adjacent to the at least one exhaust passage.
The watercraft of claim 13, wherein the exhaust manifold includes a merging portion in which the exhaust gas passages merge into a common exhaust gas passage.
Dependencies are inferred from the claim text.