Driving chain type: Chains can be divided into transmission chain, lifting chain and traction chain. Lifting chains and traction chains are used in lifting and transportation machinery. Transmission chains are widely used in general mechanical transmission. This chapter only introduces transmission chains. The transmission chain can also be divided into roller chain and tooth chain. Chain drive is composed of chain and sprocket mounted on parallel axle, which transmit motion and power through continuous meshing of chain and sprocket teeth.

The characteristics of transmission chain are as follows: 1. Compared with belt transmission, it has no elastic sliding, can maintain accurate average transmission ratio and has higher transmission efficiency; the chain does not need large tension force, so the load on the shaft and bearing is smaller; it can not slip, drive reliably, and has strong overload capacity, and can work well under low speed and heavy load; 2. It is in transmission phase with gear. It can work in high temperature and dusty environment with lower cost. 3. The disadvantage is that the instantaneous chain speed and the instantaneous transmission ratio are changeable, the transmission stability is poor, there are impact and noise in the work, and it is not suitable for high-speed situation, and it is not suitable for the situation of frequent changes in rotation direction.