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Common fault causes and solutions of worm reducer

Mar 30, 2020

Common fault causes and solutions of worm reducer


Worm gear reducer is a transmission machinery with compact structure, large transmission ratio and self-locking function under certain conditions. Among them, the hollow shaft worm gear reducer not only has the above characteristics, but also is easy to install and reasonable in structure, and has been more and more widely used. It is equipped with a helical gear reducer at the input end of the worm gear reducer. The multi-stage reducer can obtain a very low output speed, which has higher efficiency than a single-stage worm gear reducer, and has less vibration, noise and energy. Low consumption.


I. Common problems and their causes


1. The reducer generates heat and leaks oil. In order to improve efficiency, worm gear reducers generally use non-ferrous metals as worm gears, and worms use harder steel. Because it is a sliding friction transmission, more heat is generated during operation, which causes differences in thermal expansion between the parts of the reducer and the seal, thereby forming gaps on each mating surface. The lubricant fluid becomes thinner due to the increase in temperature and is likely to cause leakage. .


There are four main reasons for this situation. One is the unreasonable combination of materials; the other is the poor quality of the meshing friction surface; the third is the incorrect selection of the amount of lubricant added; the fourth is the poor assembly quality and the use environment.


2. Worm gear wear. The worm gear is generally made of tin bronze. The matched worm material is hardened to 45 hrc4555 or 40cr hardened hrc5055 by a worm grinding machine and ground to a roughness of ra0.8 μm. Reducers wear slowly during normal operation, and some reducers can be used for more than 10 years. If the wear speed 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 the use environment.


3. Transmission pinion gear is worn. It usually occurs on a vertically installed reducer, which is mainly related to the amount of lubricant added and the type of oil. In 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 get the proper lubrication protection. When the reducer is started, the gears are mechanically worn or even damaged due to lack of effective lubrication.


4. Worm bearing is damaged. When a failure occurs, it is often found that the gear oil in the reducer is emulsified, and the bearings are rusted, corroded, and damaged, even if the reduction box is well sealed. This is because the condensate generated after the gear oil temperature rises and cools down after running for a period of time is mixed with water. Of course, it is also closely related to bearing quality and assembly process.


Second, the solution


1. Guarantee assembly quality. You can buy or make some special tools. When removing and installing reducer parts, try to avoid hitting with other tools such as hammers. When replacing gears and worm gears, try to use original accessories and replace them in pairs. When assembling the output shaft, pay attention Tolerance fit; use anti-adhesive or red tan oil to protect the hollow shaft, prevent wear and rust or fit area dirt, and it is difficult to disassemble during maintenance.


2. Selection of lubricants and additives. The worm gear reducer generally uses 220 # gear oil. For heavy load, frequent startup, and poor use of the reducer, some lubricant additives can be selected to keep the gear oil on the surface of the gear when the reducer is stopped, forming protection. Membrane to prevent direct contact between heavy load, low speed, high torque and metal during startup. The additives contain seal ring regulators and anti-leakage agents, which keep the seal ring soft and elastic, and effectively reduce lubricant leakage.


3. Selection of installation position of reducer. Where possible, vertical installations should be avoided. In vertical installation, the amount of lubricant added is much more than in horizontal installation, which may cause heat and oil leakage of the reducer.


4. Establish lubrication maintenance system. The reducer can be maintained according to the "five set" principle of lubrication work. Every reducer must be inspected regularly by the responsible person. It is found that the temperature rise is obvious, exceeding 40 ℃ or the oil temperature exceeds 80 ℃. When more copper powder is found in the system and abnormal noise occurs, stop using it immediately, repair it in time, remove the fault, and replace the lubricant. When refueling, pay attention to the amount of oil to ensure that the reducer is properly lubricated.


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