(1) Chain hinge wear. After the hinge wear, the chain link becomes longer, which is easy to cause jump teeth or chain release. In case of open drive, poor environmental conditions or poor lubrication and sealing, hinge wear will be easily caused, sharply reducing the service life of the chain.

(2) Overload pull-out. This kind of pull-out usually takes place in the transmission of low speed and heavy load.

Under certain service life, a limit power expression can be obtained from a failure form. For clarity, use a graph. The limit power curve corresponds to various failure modes under normal lubrication conditions. The shaded portion of the figure is the actual area used. If the lubrication seal is bad and the working condition is bad, the wear will be very serious, and the limit power will be greatly reduced.