Two-cycle engine
AssigneeYamaha Matsudoki Kabushiki Kaisha
InventorsKimitake Otome, Osamu Tamura
Life of this patent
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Abstract
A number of embodiments of two-cycle engines employing Schnurle-type scavenging. In addition, a tumble 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. Also, arrangements are shown for controlling the amount of tumble flow.
Claims15
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, at least one scavenge passage 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 means for introducing a tumbling air flow into said combustion chamber that flows into said cylinder bore and diametrically across said cylinder bore, axially along said cylinder bore toward said cylinder head, and transversely back across said cylinder bore.
Dependencies are inferred from the claim text.