Patent ID: 6405691
Filing Date: 2002-06-18
Classification: F01L,F02B

Abstract:
A two-stroke engine comprising:a crankcase; a crankshaft rotatably mounted in the crankcase; a cylinder having a wall forming an internal bore; a piston having front and rear sides, the piston being operatively connected from its rear side to the crankshaft for reciprocating motion within the internal bore of the cylinder between top dead center and bottom dead center positions, the piston including a substantially cylindrical outer body connected with a centrally located inner body; an annular piston valve mounted at the forward side of the piston between the outer body and the inner body, the piston valve being slidable with respect to the piston to control a flow of cycle air through the piston; and a cycle air intake opening in the wall of the cylinder at a location above a bottom dead center position of the piston, the cycle air intake being blocked and unblocked by the reciprocating motion of the piston.