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Causes of failure caused by worm gear reducer

Updated:12-06-2020
Summary:

Worm gear reducer is a power transmission mechanism tha […]

Worm gear reducer is a power transmission mechanism that uses a gear speed converter to reduce the number of rotations of the motor to the desired number of rotations and obtain a larger torque. In the mechanism for transmitting power and motion, the application range of the reducer is quite wide. It can be seen in the transmission system of various machinery, from ships, automobiles, locomotives, heavy equipment for construction, processing machinery and automated production equipment used in the machinery industry, to common household appliances in daily life , Clocks and so on.

Worm gear wear
Worm gear is generally made of tin bronze. The matched worm material is generally hardened from 45 steel to HRC45-55, and commonly used is 40C hardened HRC50-55. It is ground to a roughness of RaO.8fcm by a worm grinder. When the reducer is running normally, the worm is Like a hardened "file", the worm gear is filed continuously, causing the worm gear to wear. Generally, this wear is slow. If the wear rate is faster, it is necessary to consider whether the selection of the reducer is correct, whether it is overloaded, the material of the worm gear, the quality of the assembly, or the use environment.

Worm bearing damaged
When a fault occurs, even if the gearbox is well sealed, the gear oil in the gearbox is often emulsified, and the bearing is rusted, corroded, and damaged. This is because after the reducer has been running for a period of time, the condensate produced after the gear oil temperature rises and cools is mixed with the water.

Reducer heating and oil leakage
In order to improve the efficiency of the worm gear reducer, non-ferrous metals are generally used as the worm gear, and the worm is made of harder steel. Because it is a sliding friction drive, it will generate higher heat during operation, so that the reducer parts and seals There is a difference in thermal expansion between each other, resulting in a gap in each mating surface, and the oil becomes thinner due to the increase in temperature, which is easy to cause leakage.

Worn small helical gears
It usually occurs on the vertical reducer, mainly related to the amount of lubricating oil added and the type of oil. During vertical installation, it is easy to cause insufficient lubricant quantity. When the reducer stops running, the transmission gear oil between the motor and the reducer is lost, and the gears cannot be properly protected by lubrication. When the reducer is started, the gears are worn or even damaged due to the lack of effective lubrication.

 
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