Instead of idler gears, a toothed belt or chain can be used to transmit torque over distance.

It is possible to design gear teeth for gears that are non-circular, yet still transmit torque smoothly.

Angled gear teeth transmit greater torque for more power from the motor to the blades.

The V-groove transmits torque through a wedging action, thus increasing friction.

Because there is no mechanical contact between the two shafts, they are also used to transmit torque through a physical barrier like a thin plastic wall.

The axle shafts themselves do not carry any weight; they serve only to transmit torque from the differential to the wheels.

When slipping it still transmits torque despite the difference in speeds between the engine crankshaft and the transmission input.

Hypoid gears are still common in larger trucks because they can transmit higher torque.

A higher hypoid offset allows the gear to transmit higher torque.

A gear coupling is a mechanical device for transmitting torque between two shafts that are not collinear.