Idler Shaft

An idler shaft is a stationary or rotating shaft that supports idler gears, pulleys, or sprockets, which are not directly connected to any power source. Unlike drive shafts, the idler shaft itself does not transmit torque but plays a critical role in mechanical systems by redirecting motion, maintaining proper spacing between components, and ensuring belt or chain tension is consistent. Commonly found in gearboxes, conveyors, and automotive systems, the idler shaft improves efficiency and performance by guiding the motion of other elements and allowing for smoother power transmission across the system.