Causes and treatment methods of motor bearing overheating

Motor bearing overheating in 2018 - the cause and the treatment method 12 - 22 a, the concept of bearing overheating: general sense, refers to the bearing overheating, rolling bearing temperature rise more than 55 ℃, sliding bearing temperature rise of more than 40 ℃. Second, the cause of the motor bearing overheating and handling method: 1, the reason: rolling bearing installation is not correct, tolerance is too tight or too loose. Processing method: rolling bearing performance depends not only on the manufacturing precision of the bearing itself, and also cooperate with it in the shaft and hole size precision and shape tolerance and surface roughness, with the selection and installation are correct or not. Generally, horizontal motor assembly good rolling bearing only withstand radial stress, but if the bearing inner ring and the shaft with a tight, or bearing outer ring and the matching of the end cover too tight, namely negative allowance is too large, after assembly will make bearing gap is too small, sometimes even close to zero. This rotation is not flexible, in the operation of the fever. If the bearing inner ring and the shaft with too loose, or bearing outer ring and cooperate too loose end cover, the bearing inner ring and the shaft, or bearing outer ring and end cover, relative rotation occurs, the friction heat, caused by overheating of bearings. Usually, the standard will be as a benchmark in parts of bearing inner ring diameter tolerance zone moved below the zero line, the tolerance zone of the same shaft and bearing inner ring form, than it has to do with general benchmark hole formation with much more important. 2, reason: choose grease may be inappropriate or improper in operation and maintenance, quality is bad or has bad, grease or mixed with dust impurities and so on all can cause bearing heating. Processing method: add grease too much or too little will cause bearing heating, because too much grease, bearing will produce a lot of friction between rotating parts and fat, and add a little grease, may appear dry friction and heat. So we must adjust the dose of grease, making them approximately 1/2 - bearing chamber volume 2/3. For inappropriate or bad grease should be clean, put on appropriate clean grease. 3, reason: motor bearing cover and cylindrical roller bearing between the axial clearance is too small. Methods: large and medium-sized motor generally on the non shaft extension end using ball bearings. Using roller bearing shaft extension end, so, when the rotor heat expansion, free elongation. And due to both ends of small motor USES ball bearing, outside its between bearing cover and the bearing outer ring should be a proper clearance, otherwise, bearing might be due to excessive axial thermal elongation and fever. When appear this kind of phenomenon, should be before or rear bearing cover car to go a bit, or between bearing cover and the end cover and a thin MATS, make the end bearing cap and form a sufficient clearance between the bearing outer ring. 4, reason: motor end cover or bearing cover installed on both sides. Processing method: if the motor end cover or bearing cover is installed on both sides are not parallel or check mouth did not rely on strict, will make the ball wide orbits and fever. Must refocus on both sides of the end cover or stop bearing cover mouth flat, and rotate tight fixed bolts evenly. 5, reason: ball, roller, inside and outside the ring, ball bearing severe wear or metal flake. Methods: should update the bearings at this time. 6, because: bad and load mechanical connection. Include: bad coupling assembly, belt tension is too large, and different load mechanical axis of the speech, belt wheel diameter is too small, pulleys are too far away from the bearing, the excessive axial or radial load, etc. Processing method: correcting incorrect connection, avoid bearing abnormal reaction. 7, reason: shaft bending. Methods: the bearing load is no longer the pure radial force, therefore cause bearing heating. Should be tried to bend axis alignment or replace the new shaft.