Introduction to the failure cause of the gear reducer and the inspection method for the failure cause

XNUMX. Heating and oil leakage of the gear reducer

Gear reducerIn order to improve efficiency, non-ferrous metals are generally used as worm gears, and worms are made of hard steel. Because it is a sliding friction drive, during operation, it will generate high heat, which will cause thermal expansion between the parts of the reducer and the seal. There is a difference, resulting in a gap between the mating surfaces, and the oil becomes thinner due to the increase in temperature, which is easy to cause leakage.

There are four main reasons. One is whether the combination of materials is reasonable, the second is the surface quality of the meshing friction surface, the third is the choice of lubricating oil, whether the amount of addition is correct, and the fourth is the assembly quality and use environment.

XNUMX. Worm gear wear

The worm gear is generally made of tin bronze, and the paired worm material is generally hardened with 45 steel to HRC45-55, and 40C is also commonly used: hardened HRC50-55, which is ground to a roughness of RaO.8fcm by a worm grinder. When the reducer is running normally, the worm Just like a hardened "file", it keeps filing the worm gear, causing wear and tear of the worm gear. Generally speaking, this kind of wear is very slow, like some reducers in a certain factory, which can be used for more than 10 years.

If the wear rate is fast, it is necessary to consider whether the selection of the reducer is correct, whether there is overload operation, the material of the worm gear, the assembly quality or the use environment and other reasons.

XNUMX. Wear and tear of the transmission small helical gear

It usually occurs on the gear reducer installed vertically, mainly related to the amount of lubricating oil added and the selection of lubricating oil. When installed vertically, it is easy to cause insufficient lubricating oil. When the reducer stops running, the motor and reducer The transmission gear oil is lost, the gear cannot be lubricated and protected, and the lack of effective lubrication during startup or operation leads to mechanical wear or even damage.

XNUMX. Worm bearing damage

When the 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 bearings have been rusted, corroded and damaged. It is caused by the condensation of water after the heat becomes cold; of course, it is also closely related to the quality of the bearing and the assembly process.