Simulation And Experimental Study On The Parking Lock Mechanism Of Cone-Ring Type Continuously Variable Transmission

Compared with traditional manual transmission,automatic transmission has the advantages of simple operation,low driving strength,smooth shifting and ride comfortable.With the development of technology and important of consumption level,the acceptance of automatic transmission and vehicle loading capacity have been greatly improved.The mechanic structure of the automatic transmission has great difference compared with the manual transmission.The parking lock mechanism is designed inside the automatic transmission,which is the P block of the automatic transmission.After the driver operates the gear shift level to the P block,the parking lock mechanism locks the output shaft of the transmission,to ensure that vehicles parked stably for a long time and avoid the occurrence of dangerous situation such as slip slope.At present,the article about parking lock mechanism at home and abroad is relatively rare.Based on the finite element method and the multi-body dynamics theory,this paper use Hyper Mesh,ANSYS and ADAMS to build the rigid flexible coupling model of the parking lock mechanism of the cone ring CVT,the simulation analysis and performance test are carried out.Firstly,the composition and working principle of parking lock mechanism are described,and different parking lock mechanism is classified.According to the requirement of mechanism function,the design criterion of mechanism is put forward.According to the requirements of the performance of the mechanism,the calculation methods of critical parking speed,gear stability,anti abnormal parking performance and parking pawl automatically pop-up performance are explored.Secondly,according to the mechanism design criteria and related calculation,using Pro/E software to design the 3D model of each part of the parking lock mechanism and set up assembly model.Based on the theory of multi-body system dynamics and finite element method,using ADAMS and Hyper Mesh to build the rigid flexible coupling model of the parking lock mechanism.Based on the impact function method,the contact parameters are determined.Based on the model,the critical parking speed,the impact torque of the output shaft and the pick off torque are obtained.According to the performance requirements of the mechanism,the critical parking speed and parking time are selected as the performance evaluation indexes,the parameters that affect the performance of the mechanism are identified.Modify the identified relevant parameters,regenerate the mechanism 3D assembly model.Based on the above simulation model,re-import the new assembly model and generate the rigid flexible coupling dynamic simulation model.The models that with different parameters are simulated and analyzed,and the critical parking speed and parking time are obtained.Finally,according to the actual vehicle parking process,the test method of the parking lock mechanism is determined.The performance test system is designed.The parking lock mechanism performance test is carried out.The critical parking speed and torque are obtained.The simulation result curves are the same with the experimental results,which verifies that the modeling method is feasible and the model has a certain practical value.