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Fault analysis and research on the number of displacement coefficients of the worm gear teeth of the worm gear center. The main fault of the planetary gear reducer is that the bearing is bitten, the gear teeth are broken, the cross slide is crushed and worn, and the oil is lost at the input shaft. From the fault condition analysis of the reducer, the cause of the bearing seizure is that the overload of the bearing and the increase of the bearing temperature caused by the increase of the bearing temperature are caused by the overload of the bearing and the insufficient strength of the gear, which causes the crushing and wear of the cross slide. The bearing is killed by the overload and the hardness is not enough. The oil leakage at the input shaft is mainly due to the unreasonable structure of the reducer.
For the fault analysis of the planetary gear reducer, under the condition of ensuring the process parameters and installation dimensions, the main parameters of the planetary gear transmission and the worm drive are reasonably selected, and the unreasonable structure of the reducer is changed. First of all, the root cause of the failure of the reducer is that the oil leakage caused by oil leakage causes the temperature of the transmission parts of the reducer to rise, resulting in an overload phenomenon caused by bearing seizure. The reason for the serious oil leakage at the input shaft of the original reducer is due to the leakage at the seal, and on the other hand, due to the temperature rise of the lubricating oil, there is no air outlet, which increases the oil pressure, resulting in an internal and external pressure difference at the input shaft.
The improved planetary gear reducer adopts double seal and inlet seal ring at the input shaft. The inner diameter of the seal ring is over the diameter of the input shaft, so that the seal ring is close to the shaft diameter, and grease is added between the double seal rings to prevent the lubricating oil from flowing out. At the same time, changing the lubricating oil passage and increasing the vent hole reduces the oil pressure. In order to allow the operator to observe the amount of oil, a sight hole is designed. If the sight hole does not see the oil, the gear unit needs to be refueled. Lubricants of different grades have also been tested, and the experimental proof industrial gear oil is suitable for the lubrication of the reducer.
The gear modulus and the number of teeth increase the reliability of the planetary gear reducer. The key is to ensure the tooth surface contact strength of the gear transmission and the bending strength of the gear teeth. Since the transmission center distance of the reducer is initially determined, the planetary gear module and the planetary gear module are selected reasonably. The number of teeth is the key. Decrease, increase, increase the degree of coincidence, reduce the tooth height to make the transmission smooth, reduce the sliding speed and reduce the friction loss, but the bending strength of the gears decreases and decreases, the bending strength of the gear increases, but the coincidence decreases. The tooth profile overlap interference is generated, so the planetary gear transmission optimization design is used to select the gear modulus and the number of teeth. Determining the design variable The center distance, gear ratio and gear width of the planetary gear reducer are basically determined, but only a small amount can be varied within the allowable range. At this time, the design variable is the gear modulus.
Since the planetary gear reducer is continuously operated and overloaded, material selection and heat treatment of the planetary gear and the cross slide are very important. At present, the planetary gear and the cross slider material are used, and the material has high strength, wear resistance and small deformation after nitriding treatment, so that the cross slider is not easily crushed and the gear strength and precision are ensured. The hardness of the material after nitriding treatment can reach above. After the gear teeth are quenched and tempered, the core is soft and the toughness is good.
The smaller the difference in the number of teeth, the more likely the interference phenomenon will occur and the smoothness of the transmission will be affected. The planetary gear reducer requires dry running and forward and reverse before normal use, so that the gearing and worm drive wear-in performance is improved, the contact performance is improved, and the load is even. The actual situation proves that the planetary gear reducer has been used continuously for nearly one year, and its performance, reliability and life have exceeded the original planetary gear. Therefore, the newly designed planetary gear reducer plays a very important role in the normal operation of the production unit.