Oil pump for four cycle outboard motor
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorNoriyuki Natsume
Life of this patent
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Abstract
An outboard motor oil pump driving arrangement wherein the oil pump is driven by a spline connection positioned between the engine crankshaft and the driveshaft. There is a spline connection also between the crankshaft and the driveshaft and this spline connection is spaced axially from the spline connection to the pump drive element with the splines being space from each other by a non-splined section so as to reduce stress risers and to make assembly and disassembly easy even if the parts are deformed.
Claims17
An outboard motor oil pump and drive arrangement for a lubricating system of the engine that propels the water propulsion device of said outboard motor, said outboard motor having a powerhead comprised of a powering four cycle internal combustion engine and a surrounding protective cowling, and a driveshaft housing and lower unit depending from said powerhead and containing said water propulsion device, said engine being positioned in said powerhead so that a crankshaft of said engine rotates about a vertically disposed axis, a driveshaft depending into said driveshaft housing and lower unit for driving said water propulsion device, said engine lubricating system includes an oil pan that is positioned below said engine, said oil pump being positioned below said engine and above said oil pan, said oil pump having a drive element for driving said oil pump, a first spline connection formed between said crankshaft and said driveshaft for driving said driveshaft from said crankshaft, and a second spline connection between said crankshaft and said drive element for driving said oil pump from said crankshaft, said first and said second spline connections comprise a pair of axially spaced apart spline sets formed on one of said crankshaft and said driveshaft and separated by a non-splined portion thereof.
Dependencies are inferred from the claim text.