亚洲系列一区a久久|国产欧美成人不卡视频|了解最新爱爱视频天天干|日韩午夜精品一区二区三区|国产精品一区二区日韩91|欧美大片国产在线永久播放|福利国语自产拍在线视频中文|国产日韩区一区二区三在线视频

The gear reduction ratio of the worm gear is generally 20:1, sometimes even up to 300:1 or greater.

Many worm gears have an interesting feature that other gear sets do not possess: the worm can easily rotate the gear, but the gear cannot rotate the worm. This is because the protrusions on the screw are shallow, and when the gear tries to rotate the screw, the friction between the gear and the screw will keep the screw in place. The copper worm gear of the gate gate is an application example