Abstract: The torsional and flexural vibrations of a spur gear-transmission system consisted by gears, shafts and ball bearings are studied and the vibration mathematic model and equations of motion of the system are built in the paper. Sloving the time-variable nonlinear characteristic equations, we use the method to conbine the model analysis with the state analysis, so that the dynamical response can be found and the dynamic load factor and root-square acceleration of the gear are calculated. It is theory preparation for the dynamical analysis of the system.

Key words: 齿轮传动, 动态特性, 振动