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A gear driven four cycle, opposed, internal combustion engine with pairs of twin pistons connected by a semi-rigid shaft converts reciprocating motion to rotary torque by segmented upper and lower rack and pinion gears which alternate left and right, above and below, with a rocking rack motion at th

A gear driven four cycle, opposed, internal combustion engine with pairs of twin pistons connected by a semi-rigid shaft converts reciprocating motion to rotary torque by segmented upper and lower rack and pinion gears which alternate left and right, above and below, with a rocking rack motion at the precise centerline of the piston travel. Central oscillating arms with pairs of translating, rotating cranks, on each side of the twin pistons, smoothly reverse the piston directions without stressing the rack and pinion gear drives. Lateral loads and friction from the piston to the cylinder walls are eliminated. The equivalent torque developed is more than quadruple that of a conventional crankshaft design. The parallel twin cylinders are connected by a common rotary valve at each end of the opposed cylinders. Each cylinder houses a spherical rotary valve with an internal flow baffle which is connected to companion rotary valves by concentric shafts. The sphere is sealed with concentric piston rings inserted into a donut compression head at the top of the cylinder, below the large diameter intake and exhaust manifolds. The rotary valve, the drive pinions and the pistons are interconnected by gears for one full rotation per four cycle power stroke. Improved supercharged intake and exhaust flows are realized by the gently curved directional flow of the spherical valve over that of conventional plunger types of valves. Exhaust gas scavenging is enhanced by the overlapping intake stroke of the baffled spherical valve. Simplified manufacture, elimination of sliding friction, low weight, and multiple torque per horsepower are claimed.

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A reciprocating gear-driven engine comprising: (a) at least a pair of opposed cylinders, (b) a double-ended piston disposed in each cylinder, each double ended piston comprising a rigid piston shaft connecting two piston elements; (c) an upper circular pinion gear and two lower circular pinion gears

A reciprocating gear-driven engine comprising: (a) at least a pair of opposed cylinders, (b) a double-ended piston disposed in each cylinder, each double ended piston comprising a rigid piston shaft connecting two piston elements; (c) an upper circular pinion gear and two lower circular pinion gears, (i) the pinion gears having gear teeth disposed on alternating quarters of their circumference meshing with curved rack gears, (ii) the curved rack gears having circular pin supports disposed and rotating about the center of the rigid piston shaft, and (iii) the curved rack gears rotated into position for intermeshing with the respective pinion gears; and (d) cam arms for rotating the curved rack gears into position with the pinion gears, the cam arms being located on the reverse side of the curved rack gears, the curved rack gears being rotated into position by cam rollers riding on cam lobes protruding from the upper and lower pinion gears, wherein: (i) the gears rotate in clockwise rotation and are synchronized by slave gearing at the forward and rear ends of the engine, (ii) the upper and lower pinion gears are supported by large diameter, thick, hollow drive shafts at a vertical distance apart from one another, from the radial center of the gear teeth on the lower pinion gear to the radial center of the lower pinion gear, of 2/Pi times the stroke of the engine, (iii) the pinion gears have a diameter, measured to the radial center of the gear teeth, of 4/Pi times the stroke of the engine, and thus a gear pitch diameter with a circumference equal to four times the stroke, (iv) the center of the piston connecting shaft moves from a forwardmost position to a rearwardmost position, and the stroke is equal to the movement, from the forwardmost position to the rearwardmost position, of the center of the piston connecting shaft, (v) the shaft is made to reciprocate independently of the pinion gears by dual oscillating arms on either side of the piston shaft with pairs of crank arms having a length equal to one half the stroke, disposed so as to effect a set of four small reversible crankshafts, (vi) each crank arm is attached to pins disposed on each side of the rigid piston shaft, causing the reciprocating piston motion to rotate the upper and lower pinion gears in clockwise rotation, (vii) the pinion gears are splined to upper and lower drive shafts having gearing at the ends of the engine, driving common shafts at each end of the banks of the opposed cylinders, (viii) spherical, truncated ball valves are disposed at the ends of the cylinders to effect a means of providing an intake manifold, an exhaust manifold, a compression head portion and a reactive cylinder head power stroke surface, (ix) each spherical valve is sealed by a pair of circular piston-type rings, (x) the spherical valve is supported by hollow shafts normal to the cylinder axis and having apertures for the passage of cooling air or coolant liquid, (xi) the spherical valves are aligned in two banks, and (xii) the spherical valve shafts have geared means to rotate clockwise on one bank of spherical valves and counter-clockwise on the other bank for the disposition of common intake plenums and common exhaust mainfolds respectively above and below the engine.