a wheel with cog-type buckle teeth, used to mesh with a block with a precise pitch on a link chain or cable, a solid or spoked gear that meshes with a (roller) chain to transmit motion . Application of sprocket: It is widely used in mechanical transmission in chemical industry, textile machinery, food processing, instrumentation, petroleum and other industries. The function of the sprocket is equivalent to the timing belt. It is an important part of the engine's gas distribution system. It can ensure the accuracy of the intake and exhaust time by connecting with the crankshaft and matching a certain transmission ratio.