Ring springs are formed by an outside ring with conical inside surface and an inside ring with conical outside surface. The logarithms of inside and outside rings are pursuant to the bearing load and requirements on deformation. Ring springs are often used in the occasions that are of limited space but require powerful bumper. They are formed by a number of inside and outside rings, and need no overall replacing when any damage or abrasion occurs, while it's OK only changing the damaged rings. So they are sparing and easy for maintenance.