Two cycle internal combustion engine

A variable speed, two-cycle crankcase compression, internal combustion engine, comprising:

• engine housing wall structure including a cylinder and a crankcase, a piston mounted for reciprocation in the cylinder between top and bottom dead center positions;
• a pair of generally opposed transfer passages each in communication with the crankcase and each having an opening through the cylinder wall for supplying, to the combustion side of the piston, fluid compressed in the crankcase during movement of the piston toward its bottom dead center position;
• fuel intake means for receiving fuel from a supply source, and having intake porting in the housing structure positioned to deliver, beneath the piston and into the crankcase, fuel received from said source, said intake porting providing for such delivery of fuel independently of the transfer passages throughout the entire upward stroke of the piston, from substantially the bottom dead center position thereof to substantially the top dead center position thereof;
• reed valve means for controlling flow of fluid through the intake means and substantially preventing flow of fluid back toward such supply source during downward movement of the piston toward its bottom dead center position;
• and injector passage means responsive to the flow of fluid through said transfer passages, to draw fluid from the intake means and supply such fluid to said transfer passages and thence directly to the combustion side of the piston without compression in the crankcase, said injector passage means having porting communicating with each of said transfer passages and other porting communicating with said intake means downstream of said reed valve means.

A variable speed, two-cycle crankcase compression, internal combustion engine, comprising:

• engine housing structure including a cylinder and a crankcase, a skirted piston mounted for reciprocation in the cylinder between top and bottom dead center positions;
• at least one transfer passage in communication with the crankcase and having an opening through the cylinder wall for supplying, to the combustion side of the piston, fluid compressed in the crankcase during movement of the piston toward its bottom dead center position;
• a fuel intake chamber for receiving fuel from a supply source, and having intake porting in the housing structure positioned to deliver fuel to the space below the piston including the crankcase, said intake porting including portions configured and positioned to provide for introduction of fuel beneath the piston and into said space throughout the entire upward stroke of the piston, from the bottom dead center position to the top dead center position thereof;
• reed valve means for controlling the flow of fluid through the intake chamber and substantially preventing flow of fluid back toward such supply source during downward movement of the piston toward is bottom dead center position;
• and auxiliary inlet-transfer porting in communication with said intake porting and having a fuel supply opening through the cylinder wall adjacent the transfer passage opening, said openings of said transfer passage and said auxiliary inlet-transfer porting being adjacent, and angularly spaced from said intake porting in a plane transverse the cylinder axis.

A variable speed, two-cycle crankcase compression, internal combustion engine, comprising:

• engine housing structure including a cylinder and a crankcase, a piston mounted for reciprocation in the cylinder between top and bottom dead center positions;
• at least one transfer passage in communication with the crankcase and having an opening through the cylinder wall for supplying, to the combustion side of the piston, fluid compressed in the crankcase during movement of the piston toward its bottom dead center position;
• a fuel intake chamber for receiving fuel from a supply source, and having intake porting in the housing structure positioned to deliver fuel beneath the piston;
• and reed valve means for controlling the flow of fluid through the intake chamber substantially radially of the cylinder, said reed valve means being aligned with said intake porting and, together with said intake porting, confronting the side of said piston when the latter is in its bottom dead center position, said intake porting having a dimension, in the direction of the axis of the cylinder, substantially equal to the length of the piston stroke, whereby fuel from said intake porting is delivered beneath the piston throughout the upward stroke of the latter, from its bottom dead center position to its top dead center position.