Two-cycle engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsEiichi Ito, Tatsuyuki Masuda
Life of this patent
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Abstract
Several embodiments of two cycle crankcase compression internal combustion engines that include an arrangement for cooling and lubricating the small end of the connecting rod, the piston pin and the head of the piston. These systems include an opening that is formed in the side or skirt of the piston and which is aligned with a corresponding opening in the cylinder during at least a portion of the stroke of the piston for delivering air and/or lubricant to the interior of the piston.
Claims23
A two cycle crankcase compression internal combustion engine having a cylinder block defining a cylinder bore, a crankcase chamber formed at one end of said cylinder bore, a piston reciprocating in said cylinder bore, a connecting rod connected at one end to said piston and at another end to a crankshaft journalled for rotation in said crankcase chamber, said piston having an opening in its outer surface aligned with said one end of said connecting rod, and an air passage formed within said cylinder and opening into its cylinder bore at a position aligned with said piston opening during at least a portion of the stroke of said piston for delivering a cooling air flow to said connecting rod one end.
A two cycle crankcase compression internal combustion engine having a cylinder block defining a cylinder bore, a crankcase chamber formed at one end of said cylinder bore, a piston reciprocating in said cylinder bore, a connecting rod connected to one end to said piston and at another end to a crankshaft journalled for rotation in said crankcase chamber, said piston having an opening in its outer surface aligned with said one end of said connecting rod and circumferentially spaced from the area where said piston is connected to said connecting rod, and a lubricant supply passage formed within said cylinder and opening into said cylinder bore at a position aligned with said piston opening during at least a portion of its stroke for delivering lubricant to said connecting rod one end.
A two cycle crankcase compression internal combustion engine having a cylinder block defining a cylinder bore, a crankcase chamber formed at one end of said cylinder bore, a piston reciprocating in said cylinder bore, a connecting rod connected at one end to said piston and at another end to a crankshaft journalled for rotation in said crankcase chamber, said piston having an opening in its outer surface aligned with said one end of said connecting rod, a lubricant supply passage formed within said cylinder and opening into said cylinder bore at a position aligned with said piston opening during at least a portion of its stroke for delivering lubricant to said connecting rod one end, and means for also supplying air through said cylinder opening to said piston opening.
Dependencies are inferred from the claim text.