How do the manual transmission work ？

When the manual transmission is shifted, the meshing of the two gears changes the gear ratio of the gear. In order to smoothly shift gears, the speeds of the two gears before and after shifting must be consistent. However, since the two gears’ ratios are different, the ratios before and after the meshing are also different. This causes a gear collision to occur during shifting, which causes a lot of noise and vibration. If there is a device that can quickly synchronize the two gears that are about to engage, the engagement will be much smoother.