A study on wear degradation of internal spur gear under hybrid elastohydrodynamic lubrication

Aiming at the problem that the existing wear calculation method is difficult to accurately solve the wear of internal gears under mixed elastohydrodynamic lubrication, a calculation model of adhesive wear and dynamic coupling was proposed. According to the theory of elastohydrodynamic lubrication, the formula of oil film stiffness was obtained. The comprehensive stiffness model under mixed elastohydrodynamic lubrication conditions was constructed by combining oil film stiffness, tooth surface contact stiffness, and load factor to improve the dynamic model. In order to deeply analyze the relationship between the dynamic meshing force and the wear amount under the mixed elastohydrodynamic lubrication, the accumulated wear amount was substituted into the dynamic model as the flank clearance, and the dynamic meshing force and wear amount under different meshing times were finally obtained. The calculation results show that the wear amount entering the meshing section is greater than the wear amount of the exiting meshing section; the dynamic meshing force will increase with the wear amount, and it will increase in the meshing section and decrease in the exiting meshing section. As the wear amount increases, it converges quickly; the oil film stiffness is sensitive to the dynamic meshing force and is not affected by the initial wear; the overall stiffness and load factor do not change during the initial wear. © 2021, Editorial Office of Journal of Vibration and Shock. All right reserved.