Fatigue Life Analysis Of Cylinder Roller Bearing Cage For The High-speed Rail Traction Engine

Due to excellent capacity in power output and overload capability,High-speed rail traction engines are widely used in trunk railways.However,in practical applications,fatigue failure of bearing cages for traction engine occurs frequently,which seriously affects the safety of locomotives.Fatigue failure of traction engine bearing cages has become an urgent problem to be solved.Therefore,we carried out the study.The fatigue failure of a cylindrical roller bearing cage for the high-speed traction engine is analyzed in this article.Considering the effect of Hertz contact and lubrication on the internal components of cylindrical roller bearings,a dynamic analysis model of cylindrical roller bearings is established.Based on it,the dynamic response of cylindrical roller bearings under different load conditions and structural parameters is studied.The finite element analysis model of the full roller and cage is established with the dynamic analysis results as its boundary conditions.Adopting explicit dynamic finite element method,the paper researches cage variation of stresses under different load conditions and structural parameters.The results show that:(1)the rotational speed,radial load and radial clearance of the high-speed rail traction engine cylindrical roller bearing have a great influence on the collision stress between the rolling element and the cage.With the increase of rotational speed,radial load and radial clearance,the maximum equivalent stress of the cage increases,resulting in fatigue failure of the cage.(2)In the case of steady-state operation,the collision stress between the cage and the roller fluctuates remarkably when the roller just enters the loading zone.As the rolling element moves gradually,the range of the collision stress fluctuation of the cage gradually decreases.(3)The existence of vibration acceleration is the root cause of the fatigue failure of cage.The greater the vibration acceleration,the lower the fatigue life of the cage is.Large vibration acceleration should be avoided during the use of the bearing.(4)The vicinity of the fillet where the cage beam intersects the side beam is the weak point in the design of the cage.Under different load conditions and structural parameters,the stress near the fillet intersecting the beam and the side beam is much higher than other structures,and the fatigue failure is first generated from here.Based on the dynamic performance tester of cylindrical roller bearing cage,Underling different radial force and speed,the rotation speed of the cage of the traction engine cylindrical roller bearing was tested to verify the correctness of the finite element analysis model.In order to verify the reliability of the simulation analysis results,the simulation analysis results are compared with the fatigue life break position of the high-speed rail traction engine cylindrical roller bearing cage under actual working conditions.Given for the fatigue failure of the cage,the improvement measures are present for the fatigue failure of the cage here.