POWER TRANSMISSION

In order for the transmission of power from an engine to a user to take place, it is necessary to have mechanical organs such as shafts, friction wheels, toothed wheels, belts, chains, ropes,...
Shafts are cylindrical mechanical organs, solid or hollow, which transmit rotary motion.
Friction wheels work mostly in pairs and transmit motion by friction from a driving wheel to a driven wheel.
Toothed wheels also work mostly in pairs, but transmit motion from a driving wheel to a driven wheel via protrusions called 'teeth'.
Drive belts are used in conjunction with pulleys and can be rectangular or trapezoidal in cross-section. They can also be smooth or toothed.
The operation of chains is similar to that of toothed belts, although the power transmitted by the former can be much higher.
Ropes are usually used in lifting machines, but also in some brake systems. Think, for example, of the ropes used in lifts or those found in bicycle brakes.