Patent ID: 6955143

Claim:
Internal combustion engine comprising: (a) a cylinder, (b) a first central bore in said cylinder, (c) a cylinder head secured to said cylinder adjacent one end thereof, (d) a second central bore extending through said cylinder head, (e) a compound piston assembly positioned in said cylinder and movable between the bottom of its stroke and the top of its stroke, said compound piston assembly comprising: (i) a first piston slidably extendable into said second bore and movable between a first position in said second bore to close said second bore and a second position outside said second bore to open said second bore, (ii) a main piston larger in diameter than and secured to said first piston and slidably engaging said first bore, (f) a combustion chamber within said cylinder and defined by said first central bore, the upper face of said main piston and the lower surface of said cylinder head, (g) a diesel fuel injector extending into said combustion chamber, (h) means to introduce air transversely into said combustion chamber, (i) exhaust conduit means communicating with said second bore, (j) a rotatable drive shaft extending transversely through said cylinder, (k) shaft rotating means operatively interposed between said compound piston assembly and said drive shaft to rotate said drive shaft upon longitudinal movement of said compound piston assembly in said cylinder, (l) the dimensions of said combustion chamber being selected so that when said compound piston assembly reaches the top of its stroke within said cylinder, the temperature of the air and diesel fuel within said combustion chamber reaches the ignition point, (m) whereby, upon ignition of said air and diesel fuel within said combustion chamber, said compound piston assembly is forced longitudinally in said cylinder toward the bottom of its stroke thereby to rotate said drive shaft.