The reasons of high temperature rolling bearings

By measuring, if it is found that the bearing operating temperature more than the allowed value ( Such as 95 ℃) Or rise faster, should find out the reason, through other means, and further analysis and solved. Here in motor, for example to introduce the cause of the higher temperature. 1) Bearing poor quality or before running the damage in the process of transport and handling. Figure 5 - 7 a shows Yang type roller bearing inner and outer ring raceway of the axial center a deepest impression, is the road bumps in the road, rotor jumping up and down the drive bearing impact roller bearing outer ring raceway. This kind of injury, the runtime can be heard in the bearing in motor of rhythmic ', just 'sound. 2) Bearing and shaft or the bearing chamber of coaxial degree is not in conformity with the requirements, as shown in figure 5 - 7 b. 3) The axial activity should lay at one end of the bearing outer ring was bearing cover, as shown in figure 5 - 7 c. When running a shaft elongation due to temperature rising, the drive bearing inner ring left the original axial position, to squeeze the ball grinding roll, produce more heat. 4) Bearing and shaft or the bearing chamber with tight, make the bearing inner ring or outer ring extrusion deformation, smaller radial clearance, rolling spare hard, produce more heat, as shown in figure 5 - 7 d. 5) Cooperate too loose bearing and shaft or the bearing chamber, the bearing inner ring on the shaft, the outer ring in indoor fast sliding bearing ( Inner ring sliding is absolutely not allowed, the outer ring has a slow sliding in many cases to be harmless) As shown in figure 5 - 7 e. It will produce a lot of heat, can cause a sharp rise in the temperature, serious when in a very short period of time will be bearing damage, and, in turn, generate stator phase brush, winding over current burned and other major accidents. 6) Too little and too much grease or deterioration. Of the attached oil baffle plate bearing chamber structure, if not timely added grease, will gradually appear too little grease phenomenon. In addition, the use of high temperature resistance grease in the low temperature, due to its larger teaching and produce more heat. 7) Dust in the environment through the gap between bearing cover and shaft into bearing, can greatly reduce the grease lubrication function, increase the frictional resistance, produce more heat, as shown in figure 5 - 7 f. 8) Overheating caused by various reasons of the rotor, the rotor heat to the bearing, the grease in the bearing temperature reached its drop point and become a liquid and loss, high heat resulting from the bearing lubrication lost, as shown in figure 5 - 7 g.