Abstract: In an hydraulic generator-receiver for power transmission, with an improved hydraulic balancing, balancing of the axial force of the driving gear is effected by varying the value of the surface of the permanent high pressure zone, so that this variation causes an application of the high pressure on a surface of one of the side plates, either greater, or lower, while the value of the permanent high pressure zone has no influence on the other side plate. In addition, the inter-sector zone is incorporated in the sectors of the envelope to balance the tangential force of the driving gear.

Abstract: In a generator-receiver for power transmission, side plates are molded on an insert with a good coefficient of friction whose outer face is flush with the inner face of each side plate and which comprises two circular parts joined by a bi-concave joint, the insert comprising grooves in each of which the plastic material constituting the side plates penetrates to form a bead in which each cavity is formed.

Abstract: Hydraulic generator-receiver with needle bearings (123) on the driving gear (9) and providing for play compensation between the end plates (21, 22) and the envelope (36), a leak return and a better supply of the pressure zone (34).

Abstract: Hydraulic gear-driven rotary machine (pump or motor) in which the gears are free-floating with no supporting shaft or bearings. Their internal ducts rotate, providing a commutation with the stator ducts. This maintains the hydraulic equilibrium of the gears. A hydrostatic compensating device on the faces of the gears and on their toothing assures internal tightness. The hydraulic gear-driven rotary machine is suitable for operation at very high pressure with hydraulic equilibrium and internal tightness.