Chain drive uses a chain to drive a drive mechanism with specially toothed components.SprocketsThe motion and power are transmitted to the driven tooth with a special tooth profile.SprocketsA type of transmission method.
Chain drives are meshing drives with a precise average transmission ratio. They are mechanical transmissions that use the meshing of the chain and sprocket teeth to transmit power and motion. Chain length is expressed in terms of the number of links.
The number of chain links is best kept even so that when the chain is linked into a loop, the outer and inner links meet precisely, and the joint can be secured with a spring clip or cotter pin. If the number of chain links is odd, transition links must be used. When the chain is under tension, transition links also have to withstand additional bending loads, and their use should generally be avoided.
The sprocket teeth have rounded sides to facilitate chain link engagement and disengagement. The sprocket teeth should have sufficient contact strength and wear resistance; therefore, the tooth surfaces are often heat-treated. Smaller sprockets engage more frequently and experience greater impact forces than larger sprockets, so their materials are generally superior. Commonly used sprocket materials include carbon steel (such as Q235, Q275, 45, ZG310-570, etc.) and gray cast iron (such as HT200). Important sprockets may be made of alloy steel.
Advantages of chain drives: Compared with belt drives, there is no elastic slippage or slippage, the average transmission ratio is accurate, the operation is reliable and the efficiency is high; the power transmission is large, the overload capacity is strong, and the transmission size is small under the same working conditions; the required tension force is small, and the pressure acting on the shaft is small; it can work in harsh environments such as high temperature, humidity, dust, and pollution.
Disadvantages of chain drives: They can only be used for transmission between two parallel shafts; they are costly, prone to wear and elongation, have poor transmission smoothness, and generate additional dynamic loads, vibrations, impacts, and noise during operation. They are not suitable for transmissions with rapid reversal.