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Common problems of worm and worm gear

May 09, 2018

1. Reducer heat and oil leaks. In order to improve efficiency, worm gear reducers generally use non-ferrous metals as worm gears, and worms use harder steel. Due to the sliding friction drive, more heat is generated during operation, which causes differences in thermal expansion between the parts of the speed reducer and the seal, thereby forming gaps at the mating surfaces. The lubricating oil solution becomes thin due to the increase of the temperature and can easily cause leakage. . There are four main reasons for this situation. First, the mix of materials is unreasonable; the second is the poor quality of the surface of the meshed friction surface; third, the selection of the amount of lubricant added is incorrect; and fourth, the assembly quality and the use environment are poor. 2. Worm wear. The worm gear is generally made of tin bronze, and the paired worm material is hardened with 45 steel to HRC45~55, or 40Cr hardened HRC50~55 and then ground to a roughness of Ra0.8 .mu.m by a worm grinder. The gearbox wears slowly during normal operation and some reducers can be used for more than 10 years. If the wear speed is high, it is necessary to consider whether the selection is correct, whether it is overloaded, and the reason for the material, assembly quality or use environment of the worm gear. 3. Transmission helical gear wear. Generally occurs in the vertical installation of the reducer, mainly with the amount of oil added and the type of oil. In the vertical installation, it is easy to cause a shortage of lubricating oil. When the reducer stops operating, the transmission gear oil between the motor and the speed reducer is lost, and the gears are not properly protected by lubrication. When the speed reducer is started, the gears may not be effectively lubricated, resulting in mechanical wear or even damage. 4. Worm bearing damage. In the event of a failure, the gear oil in the gearbox is often emulsified and the bearing is rusted, corroded, and damaged even though the gearbox seals well. This is because after the gearbox has been running for a while, the temperature of the gear oil is increased and the condensed water produced after cooling is mixed with the oil. Of course, it is also closely related to the bearing quality and assembly process