Engine and exhaust system for watercraft
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorsMasayoshi Nanami, Ryoichi Nakase, Tetsuya Mashiko
Life of this patent
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Abstract
Two embodiments of two-cycle V-type crankcase compression internal combustion engines for powering a jet propelled watercraft. In each embodiment, the pistons of the cylinder banks each drive their own crankshafts which are geared by a transmission to an output shaft. The exhaust system for the engine is disposed on the outside of the cylinder banks and includes an expansion chamber and a portion of the exhaust system that passes over the engine. The induction system for the engine is positioned in the valley between the cylinder banks.
Claims26
A watercraft comprised of a hull defining an engine compartment, a two-cycle, crankcase compression internal combustion engine contained within said engine compartment and for a watercraft having a crankcase chamber journaling an output shaft, a pair of cylinder blocks extending at a V-angle to each other and affixed to said crankcase chamber, each cylinder block having at least one cylinder bore containing a piston for driving said output shaft, said cylinder bores having axes lying a plane that extends transversely to said output shaft, an induction system for said engine disposed substantially completely in a valley defined between said cylinder blocks for delivering at least an air charge to said crankcase chamber for transfer to combustion chambers formed above said pistons, and a pair of exhaust manifolds each affixed to a respective one of said cylinder blocks on the side thereof facing away from said valley.
A watercraft comprised of a hull defining an engine compartment, a two-cycle, crankcase compression internal combustion engine contained within said engine compartment and having a crankcase chamber journaling an output shaft, a pair of cylinder blocks extending at a V-angle to each other and affixed to said crankcase chamber, each cylinder block having at least one cylinder bore and containing a piston for driving said output shaft, said cylinder bores having axes lying on a plane that extends transversely to said output shaft, an induction system for said engine disposed substantially completely in a valley defined between said cylinder blocks for delivering at least an air charge to said crankcase chamber for transfer to combustion chambers formed above said pistons, and a pair of exhaust manifolds each affixed to a respective one of said cylinder blocks on the side thereof facing away from said valley, a pair of expansion chambers each positioned on a respective side of said engine and receiving exhaust gases from the respective exhaust manifold, and an exhaust system for discharging the exhaust gasses from said expansion chambers to the atmosphere comprising an exhaust pipe extending from each of said expansion chambers across the top of the engine to the rear of said engine.
A two-cycle, crankcase compression internal combustion engine having a crankcase chamber journaling a pair of crankshafts, a pair of cylinder blocks extending a V-angle to each other and each affixed to said crankcase chamber, each cylinder block defining at least one cylinder bore containing one piston for driving the respective crankshaft, an output shaft journaled inside said crankcase between said crankshafts and at a level below the level of said crankshafts, first and second gears affixed respectively to said crankshafts and each enmeshed with a third gear affixed to said output shaft for driving said output shaft from said crankshafts, and a magneto generator driven by one of said crankshafts at one end thereof.
Dependencies are inferred from the claim text.