Common problems of gear reducers and their causes

- Aug 28, 2020-

Common problems of gear reducers and their causes


In order to improve efficiency, helical gear motors generally use non-ferrous metals as worm gears, and worms use harder steel. Because it is a sliding friction transmission, more heat will be generated during operation, which will cause differences in thermal expansion between the parts and seals of the reducer, thereby forming gaps in each mating surface, and the lubricating oil will become thinner due to the increase in temperature, which is easy to cause leakage .

  There are four main reasons for this situation of helical gear reducer motors. One is the unreasonable combination of materials; the other is the poor quality of the meshing friction surface; the third is the incorrect choice of lubricant addition; the fourth is the assembly quality and use The environment is poor.


2. Worm gear wear of helical gear motor

  The worm wheel of the helical gear reducer motor is generally made of tin bronze, and the matched worm material is hardened to HRC4555 with 45 steel or 40Cr hardened HRC5055 and then ground to a roughness of Ra0.8μm by a worm grinder. The reducer wears very slowly during normal operation, and some reducers can be used for more than 10 years. If the wear rate is fast, it is necessary to consider whether the selection is correct, whether it is overloaded, and the material of the worm gear, assembly quality or use environment.

  Third, the drive pinion helical gear wear

  It usually occurs on the reducer installed vertically, mainly related to the amount of lubricating oil added and the oil variety. When installed vertically, it is easy to cause insufficient lubricating oil. When the reducer stops running, the transmission gear oil between the motor and the reducer is lost, and the gears cannot get the proper lubrication protection. When the reducer is started, the gears are not effectively lubricated, causing mechanical wear and even damage.

 Fourth, the worm bearing is damaged

  When a failure occurs, even if the reduction box is well sealed, it is often found that the gear oil in the helical gear reduction motor is emulsified, and the bearing is rusted, corroded, and damaged. This is because the condensate produced by the gear oil temperature rises and cools down after a period of operation of the reducer is mixed with water. Of course, it is also closely related to bearing quality and assembly process.