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What is the role of the car transmission synchronizer?

When the synchronizer is shifting, the speed of the gear at the power output end is faster than the gear that is immediately replaced by this gear. The synchronizer forces a slow rotating gear into a high-speed rotating gear

First, the role of the transmission synchronizer:
When the synchronizer is shifting, the speed of the gear at the power output end is faster than the gear that is immediately replaced by this gear. The synchronizer forces a slow rotating gear into a high-speed rotating gear, so that it needs to be replaced. The gear speed of the gear position is consistent with the gear speed of the power output end to avoid shifting shock.
Second, the transmission synchronizer introduction:
Since the transmission input shaft and the output shaft rotate at their respective speeds, there is a "synchronization" problem when shifting gear positions. If the two rotating speeds are different, the gears will forcibly mesh and the impact will be damaged and the gears will be damaged. Therefore, the shifting of the old transmission should adopt the "two-leg clutch" mode, the upshift should stay in the neutral position for a while, and the downshift should be added to the throttle in the neutral position to reduce the difference in the rotational speed of the gear. But this operation is more complicated and difficult to grasp accurately. Therefore, the designer creates a "synchronizer" that smoothly engages the gears to be engaged by the synchronizer at a uniform speed.
Third, the working principle of the synchronizer:
The synchronizer is a friction plate that is arranged on the coupling sleeve and the gear set. Unlike the conventional friction plate, its friction surface is tapered. The function of the friction plates is to advance the friction between the straight teeth and the vertical teeth of the disc to transmit the energy of the larger speed to the one with the smaller speed, so that the smaller speed increases the speed. It is synchronized with the speed of the one with the higher speed. This not only ensures normal shifting, but also acts as a buffer. The number and material of the cone friction plates directly affect the performance of the synchronizer.