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US 6,578,508 B2Granted
Small watercraft hull and engine arrangement
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsToshiyuki Hattori, Masayoshi Nanami
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AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsToshiyuki Hattori, Masayoshi Nanami
Estimating the term…
A small watercraft hull defines a vertically oriented, central longitudinal plane of the watercraft. The hull has an engine compartment with an internal combustion engine disposed therein. The engine has an engine body comprising a crankcase, a cylinder block and a cylinder head and includes at least one cylinder bore defining a cylinder axis. An air induction system is provided to guide air into a combustion chamber of the engine. The air induction system includes a plenum chamber. An exhaust system is also provided for guiding exhaust gases from the combustion chamber to the atmosphere. The exhaust system includes an exhaust conduit. The cylinder axis is canted with respect to the central plane and the exhaust conduit is disposed substantially on a side of the central plane to which the cylinder axis is canted. The plenum chamber is positioned on a side of the central plane opposite the exhaust conduit and extends substantially vertically from a position proximate the crankcase to a position proximate the cylinder head.
A small watercraft comprising a hull having an engine compartment, an internal combustion engine disposed in the engine compartment, the engine having an engine body comprising a crankcase, a cylinder block and a cylinder head, the engine body including at least one cylinder bore defining a cylinder axis, an air induction system configured to guide air into a combustion chamber of the engine, the air induction system comprising a plenum chamber having a vertically extending portion, an exhaust system for guiding exhaust gases from the combustion chamber to the atmosphere, the exhaust system comprising an exhaust manifold and an exhaust conduit, the cylinder axis being canted with respect to a vertical central plane, the exhaust manifold and conduit being disposed substantially on a side of the central plane to which the cylinder axis is canted, the vertically extending portion of the plenum chamber being positioned on a side of the central plane opposite the exhaust conduit and extending substantially vertically from a position proximate the crankcase to a position proximate the cylinder head.
A small watercraft comprising a hull including a pedestal for supporting a seat assembly, the hull additionally having an engine compartment, an internal combustion engine disposed in the engine compartment, the engine having an engine body, an air induction system configured to guide air into a combustion chamber of the engine, the air induction system comprising an air intake box defining a plenum chamber, the plenum chamber extending substantially vertically along a side of the engine body, a side of the air intake box facing the pedestal including an access opening, the pedestal including a hull opening sized, shaped and positioned to permit access to the access opening of the air intake box.
A small watercraft comprising a hull defining a vertically oriented, central longitudinal plane of the watercraft and including a pedestal for supporting a seat assembly, the hull additionally having an engine compartment, an internal combustion engine disposed in the engine compartment, the engine having an engine body, an exhaust system for guiding exhaust gases from the combustion chamber to the atmosphere, the exhaust system comprising an exhaust conduit having a portion passing along a side of the engine body, the pedestal including a hull opening, at least a portion of the exhaust conduit protruding outward through a plane defined by the hull opening, the hull additionally comprising a removable cover closing the hull opening, the cover being outwardly curved away from the pedestal to accommodate the exhaust conduit.
Dependencies are inferred from the claim text.