Aiming at the problem of uneven and insufficient lubrication of the spindle,a new type of spindle with bidirectional oil inlet lubrication structure was designed.The oil film formed by the new spindle and lining was taken as the research object.The numerical calculation model and finite element model were established.The oil film pressure,bearing capacity,and friction force were solved by Fluent software,and the lubrication characteristics of the new spindle structure under different working conditions and characteristic parameters were explored.Finally,the optimal structural parameters were obtained.The results show that with the increase of the spindle speed,the maximum pressure and bearing capacity of the oil film on the surface of the spindle will gradually increase.At the same time,the increase of oil inlet hole pressure will to some extent increase the maximum oil film pres-sure of the surface of the spindle.When the diameter of the oil inlet hole is 2.5 mm and the depth of the oil inlet hole position is 18 mm,the load-bearing capacity of the spindle structure is relatively balanced and has good lubrication performance.
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