Prediction of performance of coated spur gear using loadsharing concept

The purpose of the present research is to investigate the wear between two surfaces of coated spur gears under the mixed lubrication regime by employing the load sharing concept. By considering the coating in the problem and considering its geometric properties and material, the modeling parameters such as the equivalent radius of curvature, the equivalent elasticity modulus, the equivalent roughness and the hardness of the cylinders are changed, which leads to the change of the dimensionless parameters of the problem and as a result the values of friction and wear are calculated. Considering that the contact of the surfaces of two gears in one round of their rotation can be modeled as the contact of a large number of cylinders, the problem of linear contact of cylinders is extended to the contact of the surfaces of two gears in one round of their rotation. to be This modeling is covered by using a desired and appropriate coating such as DLC on the surfaces of the gears. One of the important parameters obtained is the critical coating thickness or minimum coating thickness. Based on the results obtained, if the selected coating thickness is less than the critical thickness, the wear rate does not improve. It was also concluded that the material of the selected coating should also have a suitable hardness in order to reduce the wear rate sufficiently.