Structural characteristics and self-locking function of worm gear reducer

1. Structural features of worm gear reducer:

  A large transmission ratio can be obtained, which is more compact than the staggered-axis helical gear mechanism.The meshing tooth surfaces of the two wheels are in line contact, and its bearing capacity is much higher than that of the staggered shaft helical gear mechanism.

  The worm drive is equivalent to a screw drive, which is a multi-tooth meshing drive, so the drive is stable and the noise is small.Self-locking.When the lead angle of the worm is less than the equivalent friction angle between the meshing gear teeth, the mechanism has self-locking properties and can achieve reverse self-locking, that is, only the worm can drive the worm wheel, but the worm cannot be driven by the worm wheel.Such as the self-locking worm mechanism used in its heavy machinery, its reverse self-locking can play a role in safety protection

  The transmission efficiency is low and the wear is serious.When the worm gear is engaged in the transmission, the relative sliding speed between the meshing gear teeth is large, so the friction loss is large and the efficiency is low.On the other hand, the relative sliding speed causes serious wear and heat generation on the tooth surface. In order to dissipate heat and reduce wear, more expensive materials with good anti-friction and anti-wear properties and good lubricating devices are often used, so the cost is high. , the axial force of the worm is large.

2. Application of self-locking function of worm gear reducer:

  In the transmission mode of the reducer, the worm gear transmission has the characteristics that other gear transmissions do not have, that is, the worm can easily rotate the worm gear, but the worm gear cannot rotate the worm.This is because the structure and transmission of worm gears are achieved through friction.

  The self-locking function of the worm gear drive is very useful in mechanical applications, such as hoists, conveying equipment, etc.However, it is also because of the friction transmission mode of the worm gear that the transmission efficiency of the worm gear is much lower than that of the gear transmission.

  Not all worm gear reducers have a good self-locking function, and the self-locking function of the worm gear can only be realized if it reaches a certain speed ratio.This is related to the lead angle, that is, the self-locking function of the worm gear with a small speed ratio is not so ideal.