The reducer is the general name of the gear system that changes the torque ratio of the rotational movement by means of gears. Gearboxes together with the gearbox are considered as an element of the parallel gear trains of the gear wheel assemblies. Gearboxes, together with the gearbox, can be characterized as an element of parallel gear trains of gear wheel assemblies. Structurally, the reducer consists of gear wheels, shafts, bearings, etc., built into the body. It is the general name of systems consisting of parts. Gearboxes, which have a wide usage area, contain the whole system and serve as a reservoir for lubrication, and gear wheels (smooth, helical, conical, etc.), rolling bearings (ball, conical, roller, etc.), sealing elements (liquid gasket) , felt rings, etc.), shafts (stepped, wedged, etc.) and fasteners (bolts, welding, solder, etc.).