The Research On Fatigue Failure Analysis And Optimization Of Incurve Hydraulic Motor Guide

The multi-acting internal curve radial plunger hydraulic motor is the most important hydraulic actuator for hydraulic system.Because of its low speed,large output torque,small volume,light weight,high mechanical efficiency and other advantages,The hydraulic motor is widely used in earthwork construction,vehicles,military industry and other engineering machinery.The hydraulic motor is still in the import stage at present,and has not established a perfect production system.Therefore,it is necessary to carry out a lot of research on the performance of the hydraulic motor,especially in the service life,and provide theoretical reference for workshop production practice.So guide should have sufficient strength,stiffness and long service life,thus can reduce more role in curve radial piston hydraulic motor fault,increase more curve within the service life of radial piston hydraulic motor.The common failure mode of the internal curve radial piston type hydraulic motor in the working process is the failure of guide rail.And the guide rail determines the output performance of the hydraulic motor.The change of inertia force of the radial plunger type hydraulic motor in the inner curve will impact the guide rail.Even it appear the phenomenon of roller out of guide.easy to cause deformation and fatigue damage.Relying on the school-enterprise cooperation project,Use The radial plunger type hydraulic motor as the analysis object.Study The structure and fatigue failure of the motor guide curve which determines its output performance.Guide should have sufficient strength,stiffness and long service life,thus can reduce more role in curve radial piston hydraulic motor fault,increase more curve within the service life of radial piston hydraulic motor.Verify The model by simulation.Solve the distance parameters of the roller out of the guide rail in different motor speed.Secondly,according to the loading conditions of the motor guide in the impact process,establish the roller impact model,solve the concentrated stress of the guide rail.Because the impact force of theroller on the guide rail is the alternating load,apply Goodman algorithm to predict the fatigue life of the guide rail.effectively reduced The impact of roller on the guide rail by optimizing the guide structure parameters.The application of amplitude correction curve can effectively avoid the occurrence of roller out of track.all effectively improve the service life of the internal curve hydraulic motor.Finally,the crack failure occurred at the lowest point of the original guide rail.establish respectively The mathematical model,physical model and the crack simulation analysis.comparing the simulation results with the field crack analysis,demonstrate the credibility of the research content.provides a reliable basis for diagnosing the fault diagnosis of the radial plunger type hydraulic motor.