So, if the driving gear has a diameter of 1 cm and the driven gear is 10 cm across, the gear train will increase the torque 10-fold while reducing the rotational speed by a factor of 10.

Power transmission transfers mechanical power. Gear trains change speed/torque. Idler gears reverse rotation. Belts/pulleys and chains/sprockets transfer motion efficiently.

Guan-Chen Chen, Shao-Yu Wang, Design and analysis of hybrid stepping motors with integrated planetary gear trains, Science Progress (1933-), Vol. 104, Supplement 3: Conference Collection IMETI ...

Torque vectoring is a relatively new technology that has been employed in automobile differentials, most commonly all-wheel-drive vehicles, that allows the amount of power sent to each wheel to be ...