Friction gear
As friction gearing all gear referred whose torque and motion transmission on the principle of the frictional engagement ( friction based). Friction gears are designed either as rolling element gears or as traction drives .
Both types of transmission can be designed with a fixed ratio or - within a limited range - with continuously variable transmission .
advantages
The particular advantage over form- fit gears is the design-related stepless transmission and the low level of noise, since the geometry of the contact zone remains unchanged during operation and there are no periodic tooth flank engagements (tooth flank backlash) that cause vibrations. They are also able to transmit high speeds and at the same time serve as overload protection.
application
Today, friction gears are represented in a wide range. V-belts , for example, operate the auxiliary units on most reciprocating engines and friction gears can be found in the drive on screw presses or texturing machines . Very modern friction gears are increasingly replacing fluid flow gears in passenger cars (e.g. Nissan "Extroid-CVT").