Design And Optimization Of Ratchet Type Controllable Clutch

This article designs a ratchet controllable overrunning clutch used in electric light truck gearboxes.In the process of shifting,by controlling the mechanism and the friction clutch,the power interruption of the two-speed gearbox of the electric vehicle is solved.At the same time,the form of lifting the pawl is adopted to avoid unnecessary wear and noise during operation.And through the structural design,dynamic simulation analysis,and contact strength analysis of the ratchet-type controllable overrunning clutch,the performance of the clutch is studied.Through the simulation of the overall model of the gearbox,the characteristics of the shift without power interruption are verified and the impact of the vehicle is determined.Structure optimization.The main research contents are as follows:1.A brief description of the development trend of electric light trucks,a detailed introduction of the latest achievements in electric vehicle gearbox configurations,the development of various academic and corporate controllable overrunning clutches.2.Introduced the structure and transmission route of the new electric light truck gearbox,theoretically analyzed the dynamic changes in the gearbox during the shift process,and designed the pawl controllable overrunning clutch structure according to the operation requirements,and adopted the scheme of multiple groups of two-way arrangements.The control loop is used for control,and the corresponding control mechanism is designed to meet the shifting conditions.Finally,the CATIA threedimensional model of the clutch is established.3.Establish dynamic simulation models of main components such as input power,friction clutch,overrunning clutch,planetary gear train,output resistance,etc.through the tools provided by RECURDYN,analyze the dynamic characteristics of the new clutch during upshift and downshift,and obtain the clutch transmission torque curve.4.Use ABAQUS for contact strength check and FE-SAFE for fatigue life simulation to verify that the clutch meets the requirements for use.5.Optimize the structure of the overrunning clutch,reduce the idling angle by encrypting the number of teeth and group engagement,thereby reducing the impact of downshifts,verifying that the improved structure meets the contact and fatigue requirements during the power downshift process,and finally by adjusting the friction clutch pressure The tight force enables the gearbox to meet the needs of use.