Two-cycle engine system

Claim 2

A stratified charge, two cycle internal combustion engine assembly having a first and second two cycle engine, each of said two cycle engines having a cylinder, a closed crankcase at one end of said cylinder, a crankshaft rotatably mounted in said crankcase, a piston coupled to said crankshaft for reciprocation along the longitudinal axis of said corresponding cylinder, an inlet port means for admitting an air-fuel mixture into said crankcase when said piston is at a position with said cylinder distal from said crankcase, and a delivery port means controlled by said corresponding piston for delivering said corresponding air-fuel mixture from said corresponding crankcase to each corresponding cylinder when said corresponding piston is disposed in the portion of said corresponding cylinder adjacent to said crankcase, the improvement comprising: a closed common combustion chamber formed at the ends of said first and second cylinders distal from said first and second crankcases, said common combustion chamber formed to centrifugally segregate said air-fuel mixtures delivered to said common combustion chamber from said first and second two cycle engines; an ignition means for igniting said air-fuel mixtures delivered to said common combustion chamber to produce an exhaust gas; an exhaust port means opening within said cylinder of said first two cycle engine for exhausting said exhaust gas from said common combustion chamber and from said cylinder of said first two cycle engine; wherein said second two cycle engine is adjusted to deliver a fuel rich air-fuel mixture, and said first two cycle engine is adjusted to deliver a fuel lean air-fuel to said common combustion chamber and to a portion of said cylinder of said first two cycle engine wherein said fuel rich and fuel lean air-fuel mixtures are thoroughly combusted and said exhaust gas is substantially free of combustible gas and partially combusted gas.

Claim 3

The stratified charge, two cycle internal combustion engine assembly of claim 1 wherein: said cylinders of said first and second two cycle engines are aligned along a common longitudinal axis and are oppositely disposed so as to couple each end of said cylinder distal from said crankcase to substantially opposed portions of said common combustion chamber.

Claim 4

The stratified charge, two cycle internal combustion engine assembly of claim 1 wherein: said piston of said second two cycle engine is cooperatively coupled to said piston of said first two cycle engine so that said pistons move toward said common combustion chamber at approximately the same time.

Claim 5

The stratified charge, two cycle internal combustion engine assembly of claim 1 further comprising: a restriction means at one end of said common combustion chamber for restricting the amouNt of flow of said fuel rich air-fuel mixture delivered to said common combustion chamber by said second two cycle engine into said cylinder of said first two cycle engine.

Claim 6

The stratified, two cycle internal combustion engine assembly of claim 1 wherein: said common combustion chamber has a generally spherical internal surface to permit segregation of said fuel lean air-fuel mixture delivered to said common combustion chamber by said second two cycle engine from said fuel rich air-fuel mixture delivered to said common combustion chamber by said second two cycle engine before ignition of said fuel lean and fuel rich air-fuel mixtures.

Claim 7

A stratified charge, two cycle internal combustion engine assembly having a first and second two cycle engine, each of said two cycle engines having a cylinder, a closed crankcase at one end of said cylinder, a crankshaft rotatably mounted in crankcase, a piston coupled to said crankshaft for reciprocation along the longitudinal axis of said cylinder, an inlet port means for admitting an air-fuel mixture into said crankcase when said piston is at a position within said cylinder distal from said crankcase, and a delivery port means controlled by said corresponding piston for delivering said corresponding air-fuel mixture from said corresponding crankcase to each corresponding cylinder when said corresponding piston is disposed in the portion of said corresponding cylinder nearest said crankcase, the improvement comprising: a closed common combustion chamber formed at the end of said first and second cylinders distal from said first and second crankcases, said common combustion chamber having a generally spherical surface to centrifugally segregate a fuel rich air-fuel mixture delivered to said common combustion chamber from said second two cycle engine from a fuel lean air-fuel mixture delivered to said common combustion chamber from said first two cycle engine before ignition of said fuel rich and fuel lean air-fuel mixtures, said cylinders of said first and second two cycle engines being aligned along a common longitudinal axis and oppositely disposed so as to couple each end of said cylinder distal from said crankcase to substantially opposite portions of said common combustion chamber; a restriction means at one end of said common combustion chamber for restricting the amount of flow of said fuel lean air-fuel mixture delivered to said common combustion chamber by said second two cycle engine into said cylinder of said first two cycle engine; an ignition means for igniting said fuel rich air-fuel mixture delivered to said common combustion chamber to produce an exhaust gas; an exhaust port means communicating with said cylinder of said first two cycle engine for exhausting said exhaust gas from said common combustion chamber and from said cylinder of said first two cycle engine.

Claim 8

A stratified charge, two cycle internal combustion engine assembly having a first and second two cycle engine, each of said two cycle engines having a cylinder, a closed crankcase at one end of said cylinder, a crankshaft rotatably mounted in crankcase, a piston coupled to said crankshaft for reciprocation along the longitudinal axis of said cylinder, an inlet port means for admitting an air-fuel mixture into said crankcase when said piston is at a position within said cylinder distal from said crankcase, and a delivery port means controlled by said corresponding piston for delivering said corresponding air-fuel mixture from said corresponding crankcase to each corresponding cylinder when said corresponding piston is disposed in the portion of said corresponding cylinder nearest said crankcase, the improvement comprising: a closed common combustion chamber formed at the end of said first and second cylinders distal from said first and second crankcases, said common combustion chamber having a generally spherical surface to centrifugally segregate a fuel rich air-fuel mixture delivered to said common combustion chamber from said second two cycle engine from a fuel lean air-fuel mixture delivered to said common combustion chamber from said first two cycle engine before ignition of said fuel rich and fuel lean air-fuel mixtures, said cylinders of said first and second two cycle engines being aligned along a common longitudinal axis and oppositely disposed so as to couple each end of said cylinder distal from said crankcase to substantially opposite portions of said common combustion chamber; a restriction means at one end of said common combustion chamber for restricting the amount of flow of said fuel lean air-fuel mixture delivered to said common combustion chamber by said second two cycle engine into said cylinder of said first two cycle engine; an ignition means for igniting said fuel rich air-fuel mixture delivered to said common combustion chamber to produce an exhaust gas; an exhaust port means communicating with said cylinder of said first two cycle engine for exhausting said exhaust gas from said common combustion chamber and from said cylinder of said first two cycle engine.

Claim 9

A stratified charge, two cycle internal combustion engine assembly of claim 6 wherein: the ratio of the volume of the common combustion chamber (X1) to the sum of the volumes of said common combustion chamber (X1), and the volume of the upper portion of the cylinder (X2) of the first two cycle engine, when the corresponding piston of the first two cycle engine is at top dead center, is in the range of 0.40 to 0.85.

Claim 10

The stratified two cycle internal combustion engine assembly of claim 7 wherein said ratio of (X1) to the sum of (X1) and (X2) is in the range of 0.65 to 0.75.

Claim 11

The stratified, two cycle internal combustion engine assembly of claim 6 wherein the ratio of the minimum cross sectional area (Y1) of the restriction means to the maximum cross sectional area (Y2) of the common combustion chamber is in the range of 0.2 to 0.5.

Claim 12

The stratified, two cycle internal combustion engine assembly of claim 9 wherein said ratio of (Y1) to (Y2) is in the range of 0.3 to 0.4.