What is a typical cause of chain elongation over time?

Chain elongation over time is primarily caused by physical wear. As a chain operates, it undergoes repeated stresses due to the tension it bears while driving gears or sprockets. This repeated loading and unloading lead to wear on the chain’s components, particularly the pins and bushings, resulting in a gradual increase in the chain's length, known as elongation.

The wear can be exacerbated by factors such as inadequate lubrication and contamination from debris, which can hasten the degradation of the material. The elongation affects the overall performance of the mechanical system, leading to issues such as poor alignment, increased noise, and decreased efficiency.

In contrast, while heat expansion can affect some materials, it is not a typical cause of chain elongation in the context of wear and fatigue. Chain lubrication is crucial for reducing wear, whereas incorrect installation tension can contribute to chain performance but does not directly cause elongation over time.