The diaphragm spring is important to the working characteristic of clutch.The impact factor of main structure sensitive factoron load characteristics is analyzed through using the A-Lformula.On the base of nonlinear FEM

the finite elementmodel of diaphragmspring isestablished.The resultsof the stress changes in theworking process and load characteristics curve are calculated.Through analysis the errorof the resultsof theoretical formula

finite element analysis and experimental results

the finite elementanalysis resultshave been found closerto the experimental results.A reference for the design is provided.