When detecting the equipment

the vibration signal of four reducers is gathered by using EZANALYST

it is found that one reducer action is hysteretic leading to the collision between two gear teeth.To investigate the influence of impact lead on gear strength under the collision situation

combining the theory of contact dynamics and using the ANSYS/LS-DYNA the working conditions of reducer pulse-on and braking stage are simulated.Through the finite element analysis

the position of maximum equivalent stress are consistent with the actual concentrated place.Through comparing the analysis results of pulse-on and braking stage

show that the impact load in the pulse-on stage is bigger owing to the larger backlash

therefore

the reducer asynchronous drive in the actual production process must be avoided.