蜗轮用于大型 齿轮 reductions are needed. It is common for worm gears to have reductions of 20:1, and even up to 300:1 or Worm Gear Slewing Drive For Timber Grab greater.
Many worm gears have an interesting property that no other gear set has: the 
worm can easily turn the gear, but the gear cannot turn the worm. This is because the angle on the worm is so shallow that when the gear tries to spin it, the friction between the gear and the worm holds the worm in place.
此功能对于传送系统等机器非常有用，在这些机器中，锁定功能可以在传送带发生故障时充当传送带的制动器。 发动机 不转动。蜗轮的另一个非常有趣的用途是托森差速器，它用于一些高性能汽车和卡车。
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