Analysis Of Joint Performance Of Bi-Directional Wedge Type Overrunning Clutch

The bidirectional wedge overrunning clutch has a series of advantages of small volume,light weight,compact structure,strong bearing capacity and high transmission efficiency.It is widely used in the transmission system of aviation electric actuators.As a key part of the transmission system of aviation electric actuator,its excellent performance has an important influence on the reliability of the transmission system.Therefore,it is of great theoretical significance and engineering value to carry out research on the design technology of bidirectional wedge type overrunning clutch.In this paper,the Bidirectional wedge overrunning clutch is selected as the research target,and its structural parameter determination,finite element static contact simulation,modal analysis and dynamic engagement simulation are carried out.Firstly,the design requirements of the bidirectional wedge overrunning clutch are analyzed,and the clutch structure is designed according to its basic characteristics and actual working conditions.Based on CATIA software,the key parts of the clutch are designed,and the three-dimensional numerical model of the bidirectional wedge overrunning clutch is established.Secondly,based on ANSYS Workbench in the bidirectional wedge type overrunning clutch transmission conditions of the nonlinear contact model,to carry out the static contact analysis of finite element analysis of the wedge and race between the contact stress and deformation and the influence of friction coefficient of wedge contact properties.Research shows that the maximum contact stress produced by the wedge is 1166.4MPa,which is less than the yield limit of the wedge and the bushing.The design of the clutch can meet the strength requirements;The contact stress between the wedge and the bush in the length direction of the wedge presents a distribution law of large and small at both ends,similar to a trough-like distribution.Furthermore,with the help of ANSYS Workbench software,the modal analysis of the bidirectional wedge type overrunning clutch system is carried out,and the natural frequencies of the first six-order modes of the bidirectional wedge type overrunning clutch system and its mode diagram are solved.The results show that under normal operation conditions,the working state of the clutch system is basically stable,and no resonance occurs;In addition,this paper also studies the influence of the changes in radial stiffness and axial stiffness of the clutch support structure on the natural frequencies and vibration modes of the clutch system,The results indicate that the stiffness of the radial support can be changed to avoid damage to the clutch structure,and the stiffness of the axial support can be changed to avoid the premature occurrence of the clutch axial vibrat ion phenomenon.At last,with the aid of the ADAMS simulation platform,the actual operating conditions of the bidirectional wedge type overrunning clutch are simulated,and the wedging process is simulated and analyzed.The performance parameters of the bidirectional wedge type overrunning clutch during the engagement process,such as engagement time,response time,rotational speed of the wedge and bushing,impact force and steady-state force when the wedge and bushing are wedged,are calculated.The simulation results show that the contact force and torque will have a large impact at the moment of clutch engagement,and then they will stabilize,and the clutch wedge,bushing and driven shaft will finally achieve synchronous movement;the engagement time of the bidirectional wedge type overrunning clutch is about 1ms,and the response time is about 10 ms.The research on the engagement performance of the bidirectional wedge type overrunning clutch has both extraordinary theoretical significance and great engineering value.