Full definition
A pulley that redirects the belt path in a drive system, changing belt direction without transmitting significant power. In conveyor systems, return pulleys support and guide the belt on its lower (return) strand, typically located at bends or where the belt must navigate around structural obstacles. In power transmission, a return pulley can be used to create a serpentine belt path for multi-shaft drives. Minimum diameter must comply with belt manufacturer specifications for the specific belt type to avoid excessive flex fatigue — typically the same as or larger than the minimum pulley diameter for the belt profile. Bearings: sealed ball bearings rated for belt tension plus pulley weight. For conveyor return pulleys, self-cleaning designs (wing, spiral) help shed material carry-back. Lagging optional but beneficial in wet conditions. Per ISO 1081 and CEMA standards. Alignment is important — a misaligned return pulley causes belt tracking problems.