1. The pressure difference between the inside and outside of the reducer: During the operation of the reducer, the friction of the motion pair is heated and affected by the ambient temperature, so that the temperature of the reducer rises. If there is no vent hole or the vent hole is blocked, the pressure inside the machine gradually increases. The higher the internal temperature, the greater the pressure difference from the outside, and the lubricating oil leaks from the gap under the pressure difference.
2. The structure design of the reducer is unreasonable.
1) Check that the hole cover is too thin, and it is easy to deform after tightening the bolt, so that the joint surface is not flat and oil leakage from the contact gap;
2) During the manufacturing process of the reducer, the casting is not annealed or aging treated, the internal stress is not eliminated, deformation is inevitable, and a gap is generated, resulting in leakage;
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3) There is no oil return tank on the tank, and the lubricating oil accumulates in the shaft seal, the end cover, the joint surface, etc., and leaks from the gap under the pressure difference;
4) The design of the shaft seal structure is unreasonable. In the early stage, the oil reducer and the felt ring type shaft seal structure were mostly used, and the felt was compressed and deformed during assembly, and the joint surface gap was sealed. If the journal is not ideally in contact with the seal, the seal will fail in a short period of time due to the extremely poor compensation performance of the felt. Although there are oil return holes in the oil groove, it is easy to block, and it is difficult to play back the oil.
3. Too much fuel: During the operation of the reducer, the oil pool is agitated very much. The lubricating oil splashes everywhere in the machine. If the amount of oil is too much, a large amount of lubricating oil will accumulate in the shaft seal, joint surface, etc. Causes a leak.
4. Improper maintenance process: When the equipment is overhauled, the oil is not completely removed due to the removal of dirt on the joint surface, or the sealant is improperly selected, the seal is reversed, and the seal is not replaced in time.
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