Study On Meshing Efficiency Of Gear Transmission Considering Time-Varying Friction Coefficient

As an important transmission component,gears have been widely used in various mechanical fields,such as automobiles,aerospace,industrial gearboxes,and machine tools.In gear transmission,transmission efficiency is an important performance indicator for evaluating transmission quality,and for the level of transmission efficiency,gear meshing efficiency is one of the main influencing factors.Therefore,in order to improve the transmission quality of gears,it is very necessary to study the gear meshing efficiency.Currently,research on gear transmission meshing efficiency mainly focuses on calculation methods,and with the deepening of research,more and more scholars believe that how to calculate a more accurate meshing efficiency becomes more important.Therefore,when deriving a calculation model for meshing efficiency,many studies have begun to consider the changes of relevant parameters in the actual meshing process,and a very important point is the time-varying characteristic of the friction coefficient.Based on the above background,in order to accurately calculate the meshing efficiency of gear pairs and study its influencing factors,in order to improve the meshing efficiency of gear transmissions from the perspective of design and use,this paper proposes a meshing efficiency calculation method that considers time-varying friction coefficients.This method uses the subroutine FRIC＿COEF provided by Abaqus to realize the time-varying characteristic of the friction coefficient at each meshing point of the tooth surface during transmission,taking into account the actual force deformation and relative motion of the tooth surface;Moreover,relevant tests were carried out using the BHC-1000 gear transmission efficiency test rig to verify the accuracy of the calculation method.The test results show that the two methods are in good agreement.Finally,using the meshing efficiency calculation method proposed in this paper,the effects of four parameters,namely gear rotation speed,load,roughness,and lubricating oil temperature,on the meshing efficiency of helical gear transmission were further studied,and the following conclusions were obtained:(1)As the speed and lubricating oil temperature increase,the meshing efficiency will show an upward trend;(2)As the torque and roughness increase,the meshing efficiency tends to decrease.