What is an indirect drive?

When choosing a coupling, the type of drive system we’re dealing with is an important consideration. In an indirect drive system, drive trains are not connected on the same axis. The driving side’s axis of rotation is parallel to the load side’s axis of rotation. Chains, belts or other components transmit torque depending on the degree of torque moment.

Unlike direct drive systems, an indirect drive has several components working together to transmit torque and motion. Because of this, there are more mechanical opportunities for error. Gearboxes, ball screw mechanisms, pulleys and others, can all potentially create mechanical backlash, efficiency loss, elasticity and noise. Speaking of noise, a classic consumer example of indirect drives is the turntable.

Belts help mitigate the motor vibrations that would affect the stylus when it makes contact with the record. It might have been a while since you last fired up a turntable, but when you do you’ll notice it takes a minute to get going. Indirect drives typically take longer to start because of the other components and connections involved. Indirect drives are also commonly found in certain boats, washing machines and more.