This standard specifies the technical requirements, complete machine technical performance, test methods, acceptance rules, signs and packaging of single-stage planar quadratic enveloping toroidal worm reducers (hereinafter referred to as reducers). This standard applies to shaft angles of 90°, center distances of 80 to 710mm, speed ratios of 10 to 63, worm speeds not exceeding 1500r/min, working ambient temperatures of -40 to +40°C, and worm shafts that can be forward or reverse. running reducer.