By the technical reconstruction for SY350 stiff mill of 2672 rolling mill plant, the new gear worm axial regulating mechanism for the rolls has been developed.

This paper introduces the characteristics of the structure and the working principles in the design of belt transmission, unconventional elastic shaft coupling, wedged oneway transcendent clutch and new the tail transmission shaft of the mini-pilotless helicopter.

By comparing the simulation results of different models,the effects of flexibility of cylinder block and crankshaft,installing method of engine and the elasticity of shaft coupling were also discussed.

By comparing the simulation results under different main bearing load,the effect of the coupling flange,the mounting stiffness and the elasticity of shaft coupling on main bearing load were discussed.

A test method based on condition simulation and a test machine featuring in oscillatory movement were set up for selflubricating spherical plain bearings(SPB).