Marine propulsion unit
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorYasuhiko Shibata
Life of this patent
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Abstract
Several embodiments of internal combustion engines for use in outboard motors that permits a compact construction. This is achieved by having the intake ports of the cylinder head have a U-shaped configuration and positioning the induction system on the side of the engine with the charge former extending into a recess formed by the cylinder block above the crankcase. Intake pipes extend along the side of the crankcase and are served by a plenum chamber that is spaced from the crankcase. Both V and in-line engines are disclosed.
Claims36
An internal combustion engine comprised of a cylinder block defining at least one cylinder bore, a cylinder head affixed to said cylinder block at one end thereof enclosing one end of said cylinder bore, said cylinder head having an intake port on one side of an axial plane containing the axis of said cylinder bore and serving said cylinder bore, a crankcase chamber formed at the other end of said cylinder block and containing a crankshaft journalled for rotation about an axis at the other end of said cylinder bore and driven by a piston reciprocating in said cylinder bore, said cylinder block having a first portion on said one side of said axial plane juxtaposed to said cylinder bore and terminating at a second portion extending laterally outwardly from said axial plane beyond said first portion and defining in part said crankcase chamber for clearing the rotation of said crankshaft, a charge forming device serving said intake port and juxtaposed to said first portion of said cylinder block, an air intake pipe extending from said charge forming device along at least a portion of said crankcase chamber, and a plenum chamber communicating with said intake pipe and positioned at least in part beyond the termination of said crankcase chamber in the direction of said axial plane on the side opposite said cylinder bore.
An internal combustion engine comprised of a cylinder block defining at least one cylinder bore, a cylinder head having a sealing surface affixed to said cylinder block at one end thereof enclosing one end of said cylinder bore, said cylinder head having an intake port on one side thereof serving said cylinder bore, an intake passage extending from said intake port through said cylinder head and terminating in a surface that extends parallel to said sealing surface, an induction system having flange means directly affixed to said surface for supplying an intake charge to said intake passage, a crankcase chamber formed at the other end of said cylinder block and containing a crankshaft journalled for rotation about an axis at the other end of said cylinder bore and driven by a piston reciprocating in said cylinder bore.
Dependencies are inferred from the claim text.