Breather structure for outboard motor
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorsGoichi Okazawa, Yasuhiko Shibata, Hiroshi Nakai
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Abstract
Several embodiments of lubricating and breather systems for outboard motors that provide effective oil separation and which permits the blow-by gases to flow in a direction the same as the lubricant return to the lubricant tank so as to avoid flow restriction. The blow-by gases are then discharged to the atmosphere through a conduit that is separate from any of the lubricant return conduits. Oil separating arrangements are disclosed as are various positions for the oil separator including in the cam chamber of the engine or in the lubricant tank.
Claims20
An outboard motor comprised of a cylinder block, cylinder head assembly having a crankcase chamber at one side thereof and which a crankshaft rotates about a vertically disposed axis and a cam chamber formed at the other side thereof, a lubricant tank suspend beneath said engine and containing lubricant for said engine, return passage means having an inlet disposed at a lower portion of at least one of said chambers and an outlet for delivering lubricant and blow-by gases to said lubricant tank, and a breather passage for discharging blow-by gases only from said lubricant tank at a point above the liquid level therein and terminating well above said outlet.
Dependencies are inferred from the claim text.