Patent ID: 6499445
Filing Date: 2002-12-31
Classification: F02B,F02F

Abstract:
A two-stroke engine comprising:a cylinder body having an air intake and an air vent; a piston slidably positioned in a portion of the cylinder body and having an admission passage and an air channel located in an upper portion of the piston; a crankshaft rotatably positioned in another portion of the cylinder body and having a cam; a connecting rod connected between the piston and the cam shaft, the connecting rod comprising an upper portion connected to the piston and a lower portion connected to the crankshaft at the cam, the upper and lower portions connected to each other and being at least partially rotatable with respect to each other; and a spring actuated tappet slidably located in slots in the upper and lower portions and biased against the cam on one end of the tappet, another end of the tappet connected to the upper portion such that sliding action of the tappet in response to rotation of the cam causes the upper portion to rotate a selected amount with respect to the lower portion, which causes the piston to rotate with respect to the cylinder body, thereby causing alignment or non-alignment of the admission passageway and the air intake, and alignment or non-alignment of the air channel and air vent at selected cycles of rotation of the crankshaft.