Many wormgears have an interesting property that no other gear set has: the worm can easily turn the gear, but the gear cannot turn the worm.
很多蜗轮蜗杆具有其他齿轮传动所没有的一种有趣的性质：蜗杆能很容易地带动涡轮，但是涡轮却带不动蜗杆。
2
Bilayer gears, crown gears, bevel gear, wheel, Helical, Worm, safety clutch teeth, small modulus gear and steering gear copper server.
双层齿轮、皇冠齿轮、伞齿轮、滚轮、斜齿、蜗杆、安全离合齿、小模数铜齿及舵机伺服器等。
3
In this paper, the author applied the mathematical theory of gear meshing, developed by Nankai University, to discuss systematically the meshing theory of Involute cylindrical wormgears.