手动变速箱都有“同步器”。没有同步器，换档时候由于动力输出端齿轮转速，要快于马上要换入这个档位的齿轮，也就是把一个慢速旋转的齿轮强行接触转速快的齿轮，那必然打齿。
The manual transmission has a "synchronizer". There is no synchronizer, because the gear speed of power output is faster than that of the gear that is to be changed into this gear, that is, to force a slow rotating gear to contact the speed of the gear.
同步器就是防止变速箱打齿的，同步器的作用就是在换档动作发生时，将即将换入档位的齿轮转速提升和输出端齿轮速度同步的状态，这样换档时候就不会存在打齿现象了。
The synchronizer is to prevent the gearbox from beating. The function of the synchronizer is to increase the speed of the gear to the gear speed to synchronize with the output gear speed when the shift action occurs, so that the gear shifting will not exist.
济南自动变速箱维修
打齿会让齿冠部分加快磨损，时间长了，次数多了，本来直角的齿冠就被磨成了圆角，入档之后咬合就不彻底了，稍微震动很容易就出现掉档的现象，较后，大修变速箱。
Teeth will make the crown part speed up wear and tear, the time is long, the number of times, the original right corner of the crown is worn into the round angle, after the file, the bite is not thorough, a little vibration is easy to appear the phenomenon of gear drop, finally, overhaul the gearbox.
1)倒车之前把车完全停稳再挂倒档是一个较好的防止打齿的办法。
1) stopping the car completely before reversing is another best way to prevent the gear from being struck.
2)一定要将离合器彻底踩到底，一定不能因为偷懒而踩一半离合器，这样就会造成严重的倒档打齿，甚就算有同步器的前进档都不要过份的迷信同步器会让换档极为平顺，如果你离合器踩得不彻底，再好的同步器也承受不住很大的转速差，同步器的磨损就会成几何倍数的加快。
2) must completely step on the clutch to the end, must not be lazy and step on the half of the clutch, so it will cause a serious reverse gear, even if the forward gear of the synchronizer do not overdo the superstition synchronizer will be very smooth, if you do not step on the clutch, the good synchronizer can not bear the very good. The big speed difference makes the synchronizer wear faster.
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