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A reciprocating piston engine (or motor) includes plural reciprocating pistons operatively connected to a single intermediate oscillating shaft, and a crankshaft having a single crank pin operatively connected to the oscillating shaft, so that the crankshaft experiences one complete revolution for e

A reciprocating piston engine (or motor) includes plural reciprocating pistons operatively connected to a single intermediate oscillating shaft, and a crankshaft having a single crank pin operatively connected to the oscillating shaft, so that the crankshaft experiences one complete revolution for each back-and-forth reciprocation of the pistons. The connection between the pistons and the oscillating shaft can include a rack-pinion drive system or a link-lever drive system. The connection between the oscillating shaft and the crankshaft can include a sector gear in mesh with a toothed rack that operates a connecting rod attached to the crank pin; alternately a lever-connecting rod drive mechanism can be used between the oscillating shaft and the crankshaft.

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1. A reciprocating piston device comprising:a piston-cylinder assembly having at least four cylinders and at least one case, each of said cylinders having one piston, each of said cylinder and its said piston having a common axis; an oscillating intermediate shaft having a rotational axis, said shaf

1. A reciprocating piston device comprising:a piston-cylinder assembly having at least four cylinders and at least one case, each of said cylinders having one piston, each of said cylinder and its said piston having a common axis; an oscillating intermediate shaft having a rotational axis, said shaft kinematically connected to said pistons; a crankshaft having one crank and carrying an element transmitting rotation between said crankshaft and an adjacent device, said crankshaft kinematically connected to said intermediate shaft; at least one primary transmission mechanism connecting said pistons and said intermediate shaft, each of said primary transmission mechanisms and the pistons connected to it being housed in one separate case section; and a secondary transmission mechanism connecting said intermediate shaft and said crankshaft, said secondary transmission mechanism being housed in another one separate case section having a chamber, said chamber having an opening closed by a cover. 2. The device of claim 1, whereinthe piston-cylinder axes are arranged in one plane, said plane being parallel to the axis of said intermediate shaft, each said piston-cylinder piston axis having two cylinders and two pistons, said two pistons being connected by a general piston rod; said primary transmission mechanism comprises a pinion secured on said intermediate shaft, and said general piston rod having a rack; and said secondary transmission mechanism comprises a pinion secured on said intermediate shaft, a slide block having a rack, and a connecting rod, said connecting rod being connected to said slide block on one end and to said crankshaft crank on another end. 3. The device of claim 2, further comprising at least one additional cylinder and one additional piston, said additional piston connected to its own piston rod, said additional cylinder and piston having an axis arranged on the same plane as the pistons connected by said general piston rod, each said additional piston having a primary transmission mechanism comprising a pinion secured on said intermediate shaft and said piston rod having a rack.4. The device of claim 1, whereinthe piston-cylinder axes are arranged in two planes, said planes being parallel to the axis of said intermediate shaft, each said piston-cylinder axis having two cylinders and two pistons, said two pistons being connected by a general piston rod; said primary transmission mechanism comprises a pinion secured on said intermediate shaft and two said general piston rods, each rod having a rack; and said secondary transmission mechanism comprises a pinion secured on said intermediate shaft, a slide block having a rack, and a connecting rod, said connecting rod being connected to said slide block on one end and to said crankshaft crank on another end. 5. The device of claim 4, further comprising at least two additional cylinders and two additional pistons, said pistons connected to their own piston rods, said additional cylinders and pistons having axes arranged on the same planes as the pistons connected by said general piston rods, each two said additional pistons having a primary transmission mechanism comprising a pinion secured on said intermediate shaft and two said piston rods, each rod having a rack.6. The device of claim 1, whereinthe piston-cylinder axes are arranged in two planes, said planes being parallel to the axis of said intermediate shaft, each said piston-cylinder axis having two cylinders and two pistons, said two pistons being connected by a general piston rod; said primary transmission mechanism comprises a double-armed lever secured on said intermediate shaft, two said general piston rods, and two shackles connecting said double-armed lever and each of said general piston rods; and said secondary transmission mechanism comprises a single-armed lever secured on said intermediate shaft, and a connecting rod, said connecting rod being connected to said single-armed lever on one end and to said crankshaft crank on another end. 7. The device of claim 1, wherein said piston-cylinder assembly comprises at least six cylinders, the axis of said cylinders are arranged in three planes, said planes being parallel to the axis of said intermediate shaft, each said piston-cylinder axis having two cylinders and two pistons, said two pistons being connected by a general piston rod, said cylinders being arranged by groups, each group having six cylinders, four of said six cylinders being arranged nearer to said intermediate shaft, and two of said cylinders being arranged farther from said shaft; andeach of said group of cylinders comprises a tertiary transmission mechanism connecting two of said six cylinders arranged farther from said intermediate shaft and two cylinders arranged nearer to said shaft. 8. The device of claim 7, wherein said primary transmission mechanism comprises a pinion secured on said intermediate shaft and two said general piston rods, each said rod having a rack;said secondary transmission mechanism comprises a pinion secured on said intermediate shaft, a slide block having a rack, and a connecting rod, said connecting rod being connected to said slide block on one end and to said crankshaft crank on another end; and said tertiary transmission mechanism comprises a pinion and two said general piston rods, each said rod having a rack. 9. The device of claim 1, wherein the axes of said cylinders are arranged in two planes, said planes being parallel to the axis of said intermediate shaft, each said piston-cylinder axis having one said cylinder and one said piston, said cylinders being arranged by groups each having two cylinders;at least one primary transmission mechanism connecting two of said pistons and said intermediate shaft, said primary transmission mechanism having a double-armed lever secured on said intermediate shaft and two links connecting each of said pistons and said double-armed lever; and the secondary transmission mechanism connecting said intermediate shaft and said crankshaft being united with one of primary transmissions, said secondary transmission mechanism having a three-armed lever secured on said intermediate shaft, two links connecting each of said one group of pistons and one arm of said three-armed lever, and a connecting rod, said rod connecting the third arm of said three-armed lever and said crankshaft crank.