Compression spring (compression spring) is a spiral spring that bears axial pressure. The spring is generally divided into equal pitch spring and variable pitch spring.
The shape of compression spring is cylindrical, conical, convex and concave, and a small amount of non-circular. There is a certain gap between the coils of the compression spring.
When subjected to external load, the spring shrinks and deforms and stores deformation energy. Variable pitch spring is becoming more and more popular, not just equal pitch spring, variable pitch spring can play a different role in different environments