The effective coil number of the spring refers to the number of cycles involved in deformation, reduce the effective coil number, will improve the spring stiffness, together with the reduction of the effective deformation of the spring, make the spring appear relatively hard, very easy to brittle. For the key springs, it is not recommended to replace the effective ring with the support ring. As the number of cycles involved in the deformation decreases, the stress curve of the spring will change, which usually makes the spring harden and very easy to break.

Spring on the number of bearing ring is a desirable category (1.5-2.5 times) the key of spring 2.5, support circle the key purpose of the key is in the radial load balance springs, prompting spring to spring tray (or spring support body) load relatively well-balanced, and to act as a buffer spring itself, the greater the number of turns, the better buffering characteristics.

If in the operation, did not find that there is a great impact vibration, spring stiffness is also ok, the proposal does not need to change, re-calculate the design scheme spring can. Spring manufacturers in the manufacture of spring, heat treatment must be able to ensure that the raw material metallographic specification, not in a cold state to make a change can be, in this case, especially the key spring, will increase the possibility of fracture.