（1）The function of synchronizers. The function of a synchronizer is to quickly synchronize the engagemelsleeve with the gear ring to be engaged, shortening the shifting time; Prevent gear shifting impactcaused by meshing of shifting gears before synchronization.2) The construction of synchronlzers. At present, almost all synchronizers used are friction type inertialsynchronizers, which can be divided into locking ring type inertial synchronizers and locking pin type inertialsynchronizers according to different locking device
① The structure of the lock ring inertial synchronizer is shown in Figure 3-8.which consists of an engagement gear ring, a slider, a lock ring (synchronousring), a spring ring, a spline hub, an engagement sleeve, etc. Sedanscommonly use lock ring inertial synchronizers.