Scavenge control for engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsJunichi Kaku, Kimitake Otome
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Abstract
A number of embodiments of two-cycle engines employing Schnurle-type scavenging. In addition and in some embodiments, a ramble port is also incorporated so as to introduce a tumble charge into the combustion chamber and reduce the likelihood of fresh charge from exiting from the exhaust port. This tumble charge may be utilized to achieve stratification, and the fuel charge may be delivered to the combustion chamber through the tumble port or in proximity to it. Various arrangements are shown for controlling the amount of scavenge flow to improve stratification and fuel vaporization.
Claims17
A two-cycle internal combustion engine having a cylinder block defining a cylinder bore, a piston reciprocating in said cylinder bore, an exhaust port formed in one side of said cylinder bore and opened and closed by the reciprocation of said piston, scavenge passage means formed in said cylinder bore and configured so as to create a scavenging air flow that moves axially along said cylinder bore toward said cylinder head, across said cylinder bore, and down said cylinder bore toward said exhaust port, and control means for controlling the volume and changing the direction of the scavenging air flow into said combustion chamber.
Dependencies are inferred from the claim text.