The paper introduced that uses QC skill and the principle of lubrication,analyses the cause of broken chain,makes use of scheme comparison,and reforms the roller chain coupling a XL type coupling with flexible star polygon.

Stiffness analysis of a new kind of elastic couplings and its design calculation;

Research on the system of measuring kinetic stiffness of elastic coupling;

Dynamic characteristics of an elastic coupling are expounded in three aspects including structure analysis,dynamics calculation and test.

Then through active/deactive operation to elastic coupling,the influence of elastic coupling for propeller movement and gear meshing force was obtained.

Study on the reduction of impulsive torque to the roller by spring coupling;

The paper offered one kind of spring housing spring coupling based on metal rubber, and made static and dynamic tests of the ring metal rubber elastic cells, analyzed the rule of static rigidity and damping parameter of different relative density cells, offered one kind damp test of equivalent viscosity based on equivalent stress function.