Pneumatic motors are used only in the mining industry and, despite this relatively narrow area, in their production there is an economically unfavorable multiplicity of models with the same operating parameters, but different sizes of the active part (rotors, pistons). For example, G I. Petrovsky plant (Donetsk SNH) serially produces gear pneumatic motors type BSH2-1-5 and PSH-7A with the same operating characteristics (pressure 3.5 kg/cm^2, power 7 hp, compressed air flow rate 6.,8-7 m3/min), but different sizes of rotors: the first has a rotor width of 150 mm and inter-center distance of 100, 75 mm, the second respectively 120 and 145.3 mm. Darasun plant (Chita SNH) and the Communist Plant (Krivoy Rog) serially produced also identical in operating characteristics (5 kg / cm^2; 10 hp; 10 m3 / min) piston engines DR-10 and MP-5. But the diameter and stroke of pistons in the DR-10 engine is 101X62 mm, and MP-5 POX 80 mm. These are not single examples.

Improving the technical and economic performance of manufactured machines and equipment can be achieved not only by creating new, more economical types of machines, but also by modernizing existing designs.

Gear motors are one of the types of pneumatic motors, widely used as a drive for combines, cutting machines, conveyors, drilling and heading machines, winches and other mechanisms in mines hazardous due to gas or dust. Mostly common are motors with helical teeth, which, in contrast to spur gears, have a higher smoothness of meshing and less noise during operation, and in contrast to herringbone – greater simplicity of design and ease of reversing. The Pnevmatika plant, for example, produces motors with helical rotors: PShB‑30 for the drive of the KKP‑1 combine; PRSh‑10 for the drive of the light heading‑drilling machine LBS‑2; PRSh‑16K for the winches of the KKP‑1 combine; PRSh‑16M for the drive of the drilling‑heading machine SBM‑Zu, the SKR‑11 conveyor, the OPL‑700 winch, etc.