Worm gear and worm reducer in order to improve efficiency, generally use non-ferrous metal worm gear, worm is made of hard steel, because it is sliding friction transmission, in the process of operation, will produce higher heat, make the reducer parts and seal between the thermal expansion difference, resulting in a gap in the mating surface, and the oil due to the increase of temperature thinning, easy to cause leakage.

There are four main reasons. One is whether the material is reasonably matched, the other is the surface quality of the meshing friction surface, the third is the selection of lubricating oil and the correct amount of addition, and the fourth is the assembly quality and the use environment. The worm gear is usually made of tin bronze, and the matching worm material is usually hardened to HRC45-55 with 45 steel. Also commonly used is 40C: hardened HRC50-55. After the worm grinder grinding to the roughness of Ra0.8fcm, reducer normal operation, the worm like a hardened "file", keep filing the worm gear, make the worm gear wear. Generally speaking, this kind of wear is very slow, if the wear speed is faster, we should consider whether the selection of reducer is correct, whether there is overload operation, the material of worm gear and worm, the assembly quality or the use of environment and other reasons. The wear of the small helical gear of the worm gear reducer generally occurs in the vertical installation of the reducer, which is mainly related to the addition of lubricating oil and the selection of lubricating oil.

When vertical installation, it is easy to cause insufficient lubricating oil, when the reducer stops running, the transmission gear oil loss between the motor and the reducer, the gear can not get proper lubrication protection, the start or operation process can not get effective lubrication leading to mechanical wear and even damage. When the worm gear reducer fails, even if the reducer is well sealed, the factory often finds that the gear oil in the reducer has been emulsified, and the bearing has been rusted, corroded and damaged. This is because the gear oil is caused by the condensation of water generated after the heat becomes cold during the operation stop of the reducer; Of course, it is also closely related to bearing quality and assembly process.