Tooth wear effects on spur gear dynamics

Analytical and experimental investigations of the influence of the deformation and wear on spur gear dynamics have been carried out. These investigations were carried out with the help of geometric and kinematic models, which took into account gear ratio changes because of the wear of teeth. An elastic, dynamic model with worn teeth having two degrees of freedom has been developed. It is based on the rigid model with only one-degree of freedom. The dynamic coefficient was then determined using this new model, and by referring to the changeable gear ratio, the teeth rigidity, the normal backlash, the friction force and the mass moments of inertia in the power transmission. Results of this experiment showed that the change of the out lines of the teeth due to wear must be taken into account when calculating the durability of the gear transmission.