手動變速箱都有“同步器”。沒有同步器，換檔時候由于動力輸出端齒輪轉速，要快于馬上要換入這個檔位的齒輪，也就是把一個慢速旋轉的齒輪強行接觸轉速快的齒輪，那必然打齒。
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.
同步器就是防止變速箱打齒的，同步器的作用就是在換檔動作發生時，將即將換入檔位的齒輪轉速提升至和輸出端齒輪速度同步的狀態，這樣換檔時候就不會存在打齒現象了。
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.
濟南自動變速箱維修
打齒會讓齒冠部分加快磨損，時間長了，次數多了，本來直角的齒冠就被磨成了圓角，入檔之后咬合就不徹底了，稍微震動很容易就出現掉檔的現象，較后，大修變速箱。
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)倒車之前把車完全停穩再掛倒檔是一個較好的防止打齒的辦法。
1) stopping the car completely before reversing is another best way to prevent the gear from being struck.
2)一定要將離合器徹底踩到底，一定不能因為偷懶而踩一半離合器，這樣就會造成嚴重的倒檔打齒，甚至就算有同步器的前進檔都不要過份的迷信同步器會讓換檔極為平順，如果你離合器踩得不徹底，再好的同步器也承受不住很大的轉速差，同步器的磨損就會成幾何倍數的加快。
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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