Pulleys & Sheaves

About pulleys & sheaves

Pulleys and sheaves are mechanical components designed to transmit power and motion through belts, facilitating speed changes, torque multiplication, or directional alteration in power transmission systems. This category encompasses timing pulleys, V-belt sheaves, idler pulleys, and associated taper-lock bushings. Timing pulleys, often specified by pitch (e.g., GT2, HTD, XL, L, H) and tooth count, engage with synchronous belts to maintain precise timing and eliminate slippage, critical in applications requiring exact positioning. V-belt sheaves are designed for classic V-belts, transmitting power through friction; they are characterized by their pitch diameter, groove profile (e.g., A, B, C, D, 3V, 5V, 8V), and number of grooves. Idler pulleys are used to guide belts, maintain tension, or route belt paths without transmitting power directly. Taper-lock bushings provide a secure, keyless shaft-to-hub connection for pulleys and sheaves, identified by their series number (e.g., 1008, 1210) and bore size. Common materials include aluminum, steel, cast iron, and various plastics (e.g., acetal, nylon), often with finishes like black oxide or anodization to enhance durability and corrosion resistance. Selection criteria include shaft diameter, belt type, desired speed ratio, torque requirements, and environmental conditions.