Reducer is a type of machinery equipment widely used by manufacturing enterprises. If there is oil leakage, it not only leads to property loss, but in more serious cases, it can cause the reducer to run with insufficient or no oil, thereby damaging the meshing surface of the transmission gears, resulting in tooth breakage or disengagement, and causing equipment accidents. So what are the causes of oil leakage in reducers? Today, Gele will share some of the knowledge we have gathered about this aspect with everyone for discussion. We hope it can bring inspiration and help to all our customers.
The pressure difference caused inside and outside the reducer: In a closed reducer, each pair of meshing gears generates friction, which releases heat. According to the fundamental law of Boyle-Mariotte, as the operating time increases, the temperature inside the reducer box gradually rises. However, the volume of the reducer box remains unchanged, so the working pressure of the box body increases, and the lubricating grease in the box body splashes out and spreads on the inner cavity of the speed-reducing surface. Under the effect of the pressure difference, the lubricating grease emerges from the gaps.
2. The overall design of the reducer is not scientific. The reducer lacks a natural ventilation cover, and the viewing cover does not have a breathable plug. The overall design of the shaft seal is not scientific. A lubrication groove and a felt ring type shaft seal structure was selected because the compensation characteristics of the felt were deviated, resulting in ineffective sealing within a short period of time. Although there is an oil inlet on the oil groove, it is very prone to clogging, and the pump oil efficiency cannot be fully exerted. During the production process, the casting parts did not undergo quenching or aging treatment, and the casting parts did not eliminate thermal stress, causing deformation. Gaps then led to oil leakage problems. There were sand holes, weld beads, gas holes, cracks and other defects, which might be caused by poor processing density and oil leakage.
3. Excessive oil addition During the entire operation of the reducer, the oil tank is vigorously agitated, and the lubricating grease splashes all over the machine body. If the oil addition is excessive, a large amount of lubricating grease will accumulate at the shaft seal, meshing surfaces, etc., causing leakage.
4. Poor installation and maintenance processes Poor installation density leading to oil leakage, the reducer bearing a large dynamic load when starting. If the installation density of the reducer fails to meet the specified standards, it will cause the anchor bolts of the reducer base to loosen, thereby intensifying the vibration of the reducer. The sealing rings at the high and low speed gear holes of the reducer will be damaged, further exacerbating the leakage of lubricating oil. In addition, during the maintenance of the machinery equipment, due to the incomplete removal of waste on the surface of the machine, improper use of sealants, the orientation of the hydraulic seals being reversed, and not immediately replacing the hydraulic seals, etc., oil leakage will also occur.