Patent ID: 7905205
Filing Date: 2011-03-15
Classification: F02B

Abstract:
1. A two-cycle internal combustion engine comprising: a combustion chamber; a closed crank case; a piston disposed between the combustion chamber and the crankcase and arranged for reciprocal movement; a crank shaft disposed within the crankcase for rotation about an axis of rotation; a first and second counter weights fixedly secured to the crank shaft for rotatable movement with the crankshaft in the direction of rotation; a connecting rod connecting the piston at an eccentric point on the first and second counterweights whereby the reciprocal downstroke and upstroke movements of the piston cause rotational movement of the crankshaft; each of the first and second counterweights having cutaway portions on one side of the axis of rotation leaving a boss to which the connecting rod is rotatably connected; each of the first and second counterweights comprised of a disk wheel having a rim with an outer edge and an inner edge; the rim of the first counterweight provided with a plurality of parallel first grooves arranged continuously around the circumference of said disk wheel rim and each extending from the outer edge of said rim to the inner edge of said rim; the first grooves angularly disposed with respect to the axis of rotation in a direction against the direction of rotation; the rim of the second counterweight provided with a plurality of parallel second grooves arranged continuously around the circumference of said disk wheel rim and extending from the outer edge of said rim to the inner edge of said rim; the second grooves angularly disposed with respect to the axis of rotation in a direction against the direction of rotation; each of said first grooves of the first counterweight aligned with each of said second grooves of the second counterweight whereby the corresponding grooves form a “V” configuration; a transfer port establishing fluid communication between the combustion chamber and crankcase; means for directing a fuel/air mixture to the interior of the crankcase; the transfer port and first and second counterweights being so disposed and arranged that the grooves of the first and second counterweights tangentially throw the fuel/air mixture into the transfer port.