FIELD: mechanical engineering. SUBSTANCE: piston machine has housing wherein a central bushing is mounted. The bushing carries two crank shafts the crank pin of which are coupled with the piston rods. The crankshafts has a drive that allows them to rotate synchronously in the bushing. The drive is made up as a gear hypocycloid mechanism comprising two movable gear wheels, each of which is rigidly connected with the crankshaft, and two fixed gear wheels rigidly connected with the housing. The bushing plays a role of the input or output link in the machine. EFFECT: enhanced efficiency. 1 dwg
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