Study On Optimization Of Sliding Support Surface Texture Of Vehicle High Speed Planetary Wheel

In this paper,the axial sliding support of the planetary drive is taken as the object of study.In the surface of the vehicle,the micro-level hydrodynamic groove is designed and processed.The hydrodynamic lubrication mechanism is used to realize the planetary wheel And the axial sliding support contact with the end of the separation,so as to reduce the contact surface friction,increase its service life purposes.The groove texture design includes the texture of groove,pit and its combination form and texture.In this paper,through theoretical analysis and numerical simulation,the lubrication characteristics of sliding bearings under different working conditions are studied systematically.The research contents of this paper include the following 4 aspects:(1)In this paper,based on the mass conservation boundary condition,the vector Reynolds equation is established for the high speed rotation of the vehicle planetary gear.Based on the finite control volume method,the differential equation of the hydrodynamic lubrication control equation is derived.Meanwhile,the theoretical basis of dynamic lubrication model is established.(2)In this paper,five geometrical models of trench type texture and its combined form are established.The influence of structural parameters,working condition parameters and groove section variation on lubrication characteristics is analyzed by numerical calculation method.And the range of the optimal parameters of different troughs is given.The lubrication characteristics of two types of groove texture were investigated.It is concluded that the tectonic texture of the homogeneous trenches is better than that of the non-isomorphic combination.The lubrication performance of the non-homogeneous trenches is dependent on the bearing capacity of the single tank,and the lubricating performance of the combined trenches is close to that of the trough The best combination of the trough in the same form.(3)In this paper,the geometrical model of micro-structure pits and their combinations are established,and the influence of structural parameters and working parameters on hydrodynamic lubrication is analyzed.The results show that the pits have different bearing capacity,but the lubricating oil flow is small.The results show that the optimal area occupancy and groove depth ratio of the array pits make the dynamicbearing capacity of the oil film,and give the optimal structural parameters of the pits without comparing the pits The results show that the lubrication performance of the same type of pits is better than that of the non-identical array pits.(4)The combination of two types of combinations forms a composite form of two textures.In this paper,we compare the texture of the composite with two trenches and composite trenches.The results show that the bearing capacity of the two groups is17.13% and 18.58% higher than that in the trench form,and the flow rate and the temperature rise of the lubricating oil are basically the same.Then,the parameters of the composite texture of the two groups were optimized by the multi-index orthogonal test method.Considering the mutual influence of the trough structure parameters,the optimal combination of the two groups of composite textures was obtained.