| In the process of road test,the internal gear shifting mechanism of a double clutch gearbox in a certain enterprise has a batch of 1,3 gear hitting,abnormal sound and off gear and other faults,disassembly found that the fork foot fracture,synchronizer joint sleeve wear and joint teeth wear seriously.This paper mainly solves the engineering problem of shifting fork failure of gear shifting mechanism of the product,and studies the influence of inclination angle of neutral groove of shifting fork shaft,steel ball radius of self-locking device and stiffness of self-locking spring on transmission shifting performance.The research contents are as follows:This paper analyzes the working process of shifting fork and synchronizer of internal shifting mechanism of double clutch transmission,and through the physical and chemical analysis of the failure shifting fork,it is concluded that the material composition of shifting fork is qualified,the heat treatment is appropriate and meets the requirements.The static analysis of the failure fork is carried out by the analysis software,and it is found that the stress concentration exists in the fork.The load spectrum was extracted for fatigue analysis through dynamic analysis,and the fatigue prediction was carried out by using the fatigue analysis software.The simulation software was used to build the gear shifting system model,and the influence of the inclination Angle of the neutral groove,the radius of the self-locking steel ball and the stiffness of the self-locking spring on the gear shifting performance of the transmission was studied.The life of shifting fork is verified by using the fatigue life test bench of transmission.After the test is completed,the transmission is disassembled and analyzed.The wear and deformation of each part is measured. |
PDF Full Text Request