| 主权项 |
1. A two-cycle engine comprising:
a cylinder having a bore section of a cylindrical shape and a combustion chamber connected continuously to one side of the bore section in an axial direction; a crankcase arranged on the other side of the cylinder in the axial direction and having a crank chamber connected continuously to the other side of the bore section; and a piston arranged in the bore section and being reciprocally movable along the axial direction between the combustion chamber and the crank chamber, wherein the piston has a crown portion opposed to the combustion chamber and a peripheral wall portion of a cylindrical shape provided continuously from the crown portion and extending along a bore surface of the bore section, the peripheral wall portion being provided with at least one through hole penetrating through the peripheral wall portion, wherein the cylinder is provided with at least one scavenging passage having a first opening being open in the bore surface and configured to make the bore section and the crank chamber communicate with each other, and at least one communication passage having a second opening being open in the bore surface on the other side with respect to the first opening and configured to make the bore section and the scavenging passage communicate with each other, wherein the second opening is located at a position corresponding to the through hole of the piston in a circumferential direction of the bore section, and wherein the cylinder and the piston are configured so that the through hole overlaps the second opening to communicate with the communication passage at least in a partial interval of a scavenging stroke in which the first opening becomes open in the bore surface on the one side of the piston with reciprocal motion of the piston. |
