Counterbalanced piston rotary machine

Claim 1

An inertia force balancing system for a reciprocating piston engine comprising at least one cylinder having a piston moving axially therein, said piston connected to a crankshaft by means of a connecting rod and a crankpin, the crankshaft having an unbalanced mass fixed on the crankshaft opposite the crankpin for balancing primary inertia forces, said engine having at least one intake rotating distributor and at least one exhaust rotating distributor arranged in communication with each cylinder, the rotating distributors being driven at an angular speed equal to that of the crankshaft but in an opposite direction by a kinetic coupling to the crankshaft, each rotating distributor comprising an auxiliary balance mass for complementary balancing of the primary inertia forces of the engine wherein the auxiliary balance masses are disposed on the rotating distributors in such a way that each of said balancing masses is in its lowest position when the piston is at TDC, in its highest position when the piston is at BDC, at a rightmost position when the crankshaft unbalanced mass is at its leftmost position and at a leftmost position when the crankshaft unbalanced mass is at its rightmost position and wherein a plane joining the axis of rotation of the intake distributor to the axis of rotation of the exhaust distributor passes substantially through the axis of rotation of the crankshaft.