Crankcase ventilating system for personal watercraft
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorMasayoshi Nanami
Life of this patent
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Abstract
A four cycle power personal watercraft having an improved crankcase ventilating and induction system. The crankcase ventilating system ensures that the crankcase gases will be passed to the combustion chambers to eliminate unburned hydrocarbons from escaping to the atmosphere. However, the system is also designed so as to preclude separated lubricant from passing into the induction system and also to prevent water from entering the engine through the induction system or the ventilating system.
Claims22
A personal watercraft having a hull defining an engine compartment, a four cycle internal combustion engine in said engine compartment, said engine driving a propulsion device associated with said hull for propelling said personal watercraft through a body of water in which it operates, said engine having a crankcase ventilation system including a crankcase ventilating discharge that is disposed at a location in said engine that is disposed relatively high in said hull during normal watercraft operation, and a crankcase ventilating return for said crankcase ventilating system for discharging the ventilating gases into an induction system of said engine for introduction into a combustion chamber thereof, said crankcase ventilating return being positioned at a relatively low position in said hull so that under normal watercraft operation and regardless of the orientation of said hull on the body of water in which it operates said ventilating return is always below said ventilating discharge of said crankcase ventilating system.
A personal watercraft having a hull defining an engine compartment in which a four cycle, internal combustion engine is provided, said engine driving a propulsion device associated with said hull for propelling said hull through a body of water in which it is operating, a crankcase ventilating system for collecting crankcase ventilating gases from said engine and delivering them to an induction system of said engine for combustion of entrained hydrocarbons in a combustion chamber of said engine, and an oil separator in said crankcase ventilating system, said oil separator having an outer housing defining an internal volume, an inlet passage communicating with a lower portion of said internal volume and an outlet passage communicating with an upper portion of said internal volume at a point below the upper end of said internal volume so as to provide an area where lubricant may collect without passing to said outlet passage even if the orientation of said personal watercraft becomes inverted.
Dependencies are inferred from the claim text.