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Analysis of the causes of oil leakage in the gearbox during work

Release time：2019-05-18
Publisher: Admin
1. Pressure difference between the inside and outside of the gearbox: During the operation of the gearbox, the friction and heat generated by the moving pair, as well as the influence of environmental temperature, cause the temperature of the gearbox to rise. If there are no ventilation holes or if the ventilation holes are blocked, the pressure inside the gearbox gradually increases. The higher the temperature inside the gearbox, the greater the pressure difference with the outside world, and lubricating oil leaks out from the gaps under the pressure difference.
2. Unreasonable structure design of reducer
1) The inspection hole cover plate is too thin, which can easily cause deformation after tightening the bolts, resulting in uneven joint surfaces and oil leakage from the contact gaps;
2) During the manufacturing process of the gearbox, if the castings are not annealed or aged, and the internal stress is not eliminated, deformation will inevitably occur, resulting in gaps and leakage;
3) There is no oil return groove on the box, and lubricating oil accumulates at the shaft seal, end cover, joint surface, etc. Under the pressure difference, it leaks outward from the gap;
4) The shaft seal structure design is unreasonable. Early reducers often used oil grooves and felt ring type shaft seal structures, which compressed and deformed the felt during assembly, sealing the joint surface gaps. If the contact between the shaft neck and the seal is not ideal, due to the poor compensation performance of the felt, the seal will fail in a short period of time. Although there are oil return holes on the oil groove, they are prone to blockage, making it difficult to fully utilize the oil return function.
3. Excessive oil filling: During the operation of the gearbox, the oil pool is stirred vigorously, and lubricating oil splashes everywhere inside the machine. If the oil filling is too high, a large amount of lubricating oil will accumulate at the shaft seal, joint surface, etc., leading to leakage.
4. Improper maintenance process: During equipment maintenance, incomplete removal of dirt on the joint surface, improper selection of sealant, reverse installation of sealing components, and failure to replace sealing components in a timely manner can also cause oil leakage.
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