Polyurethane industrial synchronous belt with trapezoidal tooth and two types of arc tooth, arc tooth has three series: arc gear ( H series is also called the HTD) , flat-topped arc-gear ( S series is also called STPD) And concave head parabolic tooth ( R series) 。 Trapezoidal tooth synchronous belt trapezoidal tooth synchronous belt with single toothed and double toothed, referred to as single-sided and double-sided tape. Double sided tape in tooth arrangement again divided into symmetric tooth type ( Code DA) And staggered tooth type ( Code the DB). Trapezoidal tooth synchronous system with two kinds of size: pitch system and modular system. Using pitch system in our country, and according to ISO 5296 to formulate the corresponding synchronous belt transmission standard GB/T 11361-11362 - And GB/T 11616-1989 1989. Arc tooth synchronous belt arc tooth synchronous belt besides tooth profile for curved shape, the structure and basic same trapezoidal tooth synchronous belt, belt pitch, the depth of tooth, tooth root thickness and fillet radius are larger than the trapezoidal tooth. Toothed after loading, the stress distribution condition is good, smooth the tooth root stress concentration, to improve the carrying capacity of the tooth. So the arc tooth synchronous belt than trapezoidal tooth synchronous belt transmission power is big, and can prevent interference of tooth meshing process. Arc tooth synchronous belt wear-resisting performance is good, little noise at work, without lubrication, can be used for dust environment. Has been in the food, automobile, textile, pharmaceutical, printing, paper and other industries widely used.