Full definition
Flexible loop element connecting two or more pulleys to transmit rotary motion and mechanical power through friction or positive engagement. Main classifications per ISO 1081: V-belts (friction, trapezoidal cross-section), timing/synchronous belts (toothed, positive drive), flat belts (high-speed friction), and Poly-V/micro-V belts (multi-rib friction). Materials include rubber (CR or EPDM body), polyester or aramid tension cords, and nylon or fiberglass reinforcement. Power range: fractional HP to 1,000+ HP. Selection based on design power, speed, ratio, and environment. Leading manufacturers: Gates, Optibelt, Continental, Mitsuboshi.