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US 4,452,194 AGranted
Outboard motor
AssigneesYamaha Hatsudoki Kabushiki Kaisha, Sanshin Kogyo Kabushiki Kaisha
InventorEifu Watanabe
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AssigneesYamaha Hatsudoki Kabushiki Kaisha, Sanshin Kogyo Kabushiki Kaisha
InventorEifu Watanabe
Estimating the term…
A water cooled, four-cycle internal combustion engine particularly adapted for use in an outboard motor. A supporting plate arrangement is used with the supporting plate extending across the driveshaft housing at its upper end. The engine is supported on the upper side of the supporting plate and an oil pan is supported on the underside of the supporting plate and depends into the driveshaft housing. The construction is such that the engine may be removed from the supporting plate without necessitating removal of the oil pan from the supporting plate so as to facilitate servicing. In addition, an oil drain is provided through the supporting plate at such a location so as to insure against leakage of the lubricant from the oil sump back into the engine regardless of whether the engine is in its normal running condition or its tilted up condition. The engine also includes an improved lubricating system for insuring good pressure lubrication of all components while minimizing the number of oil passages and avoiding the use of external oil conduits.
An outboard motor comprising a power head including an internal combustion engine, a driveshaft housing positioned beneath said power head, a supporting plate interposed between and separating said power head and said driveshaft housing, said internal combustion engine being supported upon the upper side of said supporting plate, and an oil pan for containing lubricant for said engine supported upon the lower side of said supporting plate.
In a lubricating system for a four-cycle internal combustion engine for an outboard motor tiltable about a horizontally extending axis between a normal running position and a tilted up position having a cylinder block and a cylinder head disposed with cylinder bores in a generally horizontal position when said motor is in its normal running position, a supporting plate disposed beneath said engine, and an oil pan supported beneath said supporting plate, the improvement comprising an oil drain hole extending through said supporting plate for returning oil from said engine to said oil pan, said oil return hole being positioned to be forwardly of and beneath the cylinder head when the engine is in its normal running condition and beneath the cylinder head when the engine is in its tilted up position.
Dependencies are inferred from the claim text.