齿轮轴过盈配合对轴肩微动磨损的影响研究

针对某动力总成齿轮轴轴肩在工作过程中发生严重微动磨损的现象,利用有限元软件ABAQUS建立了齿轮轴轴肩微动磨损仿真模型.通过对齿轮轴与轴承之间过盈配合的计算分析,得到齿轮轴过盈配合所需的最小过盈量,在此基础上对轴肩所受的微动磨损进行仿真分析,研究过盈配合对轴肩微动磨损的影响.通过分析在不同过盈配合下轴肩接触应力和轴肩变形量对微动磨损的影响表明:增大过盈量,轴承内圈与轴肩接触应力相应增大,轴承与轴肩接触面的相对变形量(即位移幅值)随之增大,轴肩微动磨损亦相应增大.因此,齿轮轴与轴承之间适当的过盈配合既可以保证静止状态下齿轮轴材料不出现塑性变形,又能使齿轮轴转动时有足够的接触压力传递有效转矩,可以有效地减缓齿轮轴轴肩处的微动磨损.

Effect of Interference Fit on Fretting Wear of Gear Shaft Shoulder

To deal with the problem of the serious fretting wear of a powertrain gear shaft shoulder in working process, the finite element model of the gear shaft was built with the finite element software ABAQUS. The required minimum interference was calculated through the calculation of interference fit between the gear shaft and the bearing. Simulation results were analyzed to study the effects of the interference fit on the fretting wear of the gear shaft shoulder. By analyzing the effects of the different interferences on the force and deformation of the gear shoulder, the conclusions are as follows: the force between the bearing inner ring and the shaft shoulder increases correspondingly to the increase of the interference, but on the contrary, the relative deformation (i.e. displacement amplitude) between the bearing and the shaft shoulder contact surface decreases correspondingly to the increase of the interference. Therefore, it not only guarantees that there is no gear shaft material plastic deformation in the stationary state, but also enables the gear shaft to have the sufficient contact pressure to transmit the effective torque when the interference between the gear shaft and the bearing increases to the appropriate value, which can effectively reduce the fretting wear of the gear shaft shoulder.