US 4,362,132 AGranted

Two-cycle engine

OwnerClayton L. Neumaninventor

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Abstract

A two-cycle engine is disclosed which conventionally includes a piston that reciprocates between a closed combustion chamber and crankcase. The piston reciprocates through a connecting rod that is eccentrically connected to the crank discs of a crankshaft. The crankcase is partially circular in configuration, and the crankdiscs conform in shape to the crankcase. Each crank disc has an annular recess or pocket extending around its periphery for approximately 180.degree. and in opposition to the eccentric point of connection of the connecting rod. The pockets cyclically communicate with a fuel inlet port and carburetor, both of which are positioned below the crankshaft rotational axis on the downstroke side of the crankcase. Fuel transfer passages between the crankcase and combustion chamber are positioned to receive the fuel charge from each recess as it is thrown tangentially upward with rotation of the crank discs.

A two-cycle internal combustion engine operable through combined cycles of intake, compression, combustion and exhaust, comprising:

(a) engine housing means defining
(i) a combustion chamber;
(ii) and a crankcase communicating with the combustion chamber, the crankcase having a partially cylindrical configuration;
(b) piston means disposed between the combustion chamber and crankcase and reciprocally movable to inversely vary the volume thereof with reciprocation;
(c) said engine housing means further defining
(i) transfer passage means establishing fluid communication between the combustion chamber and crankcase, the transfer passage means having inlet port means opening in the crankcase and terminating in transfer port means in the combustion chamber;
(ii) and exhaust passage means establishing fluid communication between the combustion chamber and atmosphere and terminating in exhaust port means in the combustion chamber;
(d) the piston means being constructed and disposed to open and close the transfer and exhaust port means in accordance with said combined cycles of intake, compression, combustion and exhaust;
(e) crankshaft means rotatably carried in said housing means and including crank disc means disposed in the crankcase, the disc means being sized and configured in conformance to the partially circular configuration of the crankcase;
(f) connecting rod means for operably connecting the piston means at an eccentric point on the crank disc means so that reciprocal downstroke and upstroke movements of the piston means cause rotational movement of the crankshaft means;
(g) fuel pocket means disposed on the periphery of the crank disc means in substantial opposition to said eccentric point;
(h) and fuel inlet port means disposed in said engine housing for communication with the fuel pocket means;
(i) said fuel inlet port means and crank disc means being so disposed and arranged that the fuel pocket means communicates with the fuel inlet port means as the piston means moves through its upstroke;
(j) said transfer inlet port means and crank disc means being so disposed and arranged that the fuel pocket means tangentially throws its fuel charge into the transfer passage means as the piston means moves through its downstroke.

11 more elements

Abstract

Claims22