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Worm gear mechanisms are commonly used to transmit the motions and motions between two staggered axes. Worm and worm in its middle plane is equivalent to the gear and rack, the worm and the screw shape is similar.
Shape machine structure features:
Can get a great transmission ratio, than the staggered shaft helical gear compact.
The two meshing tooth surfaces are in line contact, their carrying capacity is much higher than the staggered shaft helical gear mechanism.
Worm drive equivalent to the screw drive, multi-tooth meshing drive, so the transmission is smooth, the noise is very small.
With self-locking. When the lead angle of the worm is smaller than the equivalent friction angle between the meshing teeth, the mechanism has a self-locking property and can realize reverse self-locking. Only the worm can drive the worm and the worm can not drive the worm. As used in lifting machinery self-locking worm mechanism, the reverse self-locking can play a safety role.
Lower transmission efficiency, wear more serious. Worm gear meshing transmission, the meshing gear relative sliding speed between the large, so the friction loss, low efficiency. On the other hand, the relative sliding speed of the tooth surface serious wear and tear, severe heat, in order to reduce heat and wear and tear, often more expensive anti-friction and anti-wear better material and good lubrication device, resulting in higher costs .
Worm axial force larger.