Cross-scavenged, two-cycle internal combustion engine

Abstract

Disclosed herein is a two-cycle, internal combustion engine including a piston mounted for reciprocative movement inside a cylinder and having a top and an inlet face portion which periodically covers and uncovers an intake port during reciprocative movement of the piston, a circumferentially extending recess in the piston at the juncture between the top and inlet face portion thereof and having an inner wall which extends in front of a limited portion of the intake port located farthest away from the outlet port such that, as the piston inlet face starts to uncover the intake port, an initial flow of fresh charge flows through only the limited portion of the intake port and is deflected by the recess inner wall towards the cylinder head and along the cylinder intake wall in a direction generally parallel to the longitudinal axis of the cylinder, and a deflector carried on the top of the piston and spaced inwardly from the piston recess for deflecting additional streams of fresh charge flowing through the intake port, during subsequent uncovering thereof by the piston inlet face, toward the cylinder head in a direction generally parallel to the cylinder axis but inwardly from the initial stream of fresh charge so that the cylinder is progressively filled with fresh charge from the cylinder inlet wall towards the cylinder outlet wall.