| 摘要 |
PROBLEM TO BE SOLVED: To prevent thermal deformation by attaining durability of a piston, improving reliability, attaining low fuel consumption by easily leaning an air-fuel mixture, and improving lubricating ability of a rib part in a two-cycle engine having a rib in an exhaust port. SOLUTION: An injection nozzle 16 is arranged so as to penetrate through a cylinder 2 part to the inside from the outside, and the injection nozzle 16 is inclined upward to an inside surface (the reverse) of a piston head 5b in the upper dead center of a piston 5 or in its vicinity, and the piston 5 is cooled by injecting a part of fuel or a part of an air-fuel mixture supplied to a crankcase 37 to an inside surface of the piston head 5b from the injection nozzle 16 without passing through the inside of the crankcase 37. |
