Two-stroke internal combustion engine
AssigneeKioritz Corporation
InventorShirou Yamaguchi
Life of this patent
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Abstract
In a two-stroke internal combustion engine (1) using an internal cooling piston (2), the piston (2) has in-piston scavenging passages (19) defined therein by partition walls (18), and lower-end inlets (20) of the in-piston scavenging passages (19) are opened downward and narrowed in opening area by piston pin bosses (16). In-cylinder scavenging passages (14), which are opened and closed as the piston (2) moves, are supplied with an air-fuel mixture from the narrowed lower-end inlets (20) through the in-piston scavenging passages (19). Thereby, a fresh air-fuel mixture is increased in flow rate when flowing from the in-cylinder scavenging passages (14) to the combustion chamber (10), and the scavenging efficiency of the engine is improved.
Claims6
A two-stroke internal combustion engine, comprising:
- a cylinder having in-cylinder scavenging passages formed therein;
- a piston fittingly inserted in the cylinder and having piston apertures formed in a circumferential surface thereof;
- a crank chamber receiving an air-fuel mixture, the air-fuel mixture being compressed in the crank chamber by a descending movement of the piston;
- a combustion chamber receiving the compressed air-fuel mixture from the piston apertures through the in-cylinder scavenging passages to force out exhaust gas to an exhaust port and thereby scavenge the combustion chamber;
- and
- in-piston scavenging passages defined by partition walls provided inside the piston to communicate with the piston apertures, the in-piston scavenging passages being in communication with the crank chamber.
Dependencies are inferred from the claim text.