Impact NTN one-way thrust ball bearing limit speed common problems

We went on to look at the influence of temperature on one-way thrust ball bearing, using high temperature often said NTN bearing is in abnormal situation. High temperature also harmful to the bearing lubricant. Sometimes overheated bearings can be classified to the bearing lubricant. If the bearing temperature for a long time even the transfer of more than 125 ℃ lower bearing life. The cause of NTN bearing include: lubrication inadequate or excessive lubrication, the lubricant. Contains impurities, heavy load, bearing damage, clearance, high friction and oil seal and so on. So the continuous monitoring of one-way thrust ball bearing temperature is necessary, whether it is measuring the NTN bearing itself or other important parts. If it is on the basis of the operating conditions, the temperature change of any fault has occurred. 1) Standard ( G） Tolerance level bearing; 2) Centripetal bearing only bear radial load bearing only bear axial load; 3) = 0. 1C( C the basic dynamic load rating of bearing) ; 4) Rigidity of the bearing and the shaft; ( 5) Normal lubrication cooling conditions. When bearing in 0. 1 c load conditions during operation, because the rolling element and raceway contact surface between the contact stress increases, the working temperature, NTN bearing lubricant performance is relatively worse, therefore, one-way thrust ball bearing limit speed will be reduced accordingly. For C / = 10, due to the lower limit speed is very small, so it can not be considered, namely the f1 = 1. Centripetal bearings for joint under load, because of its number increasing, the load of rolling body friction resistance increases, higher calorific value, lubrication and cooling conditions, but also increase the force applied to keep the rack, therefore, must be based on one-way thrust ball bearing type and the size of the load Angle, cut bearing limit speed multiplied by a coefficient of f2. If the selection of NTN bearing speed limit speed cannot satisfy the use requirement, can use some improved technology measures to improve, to achieve a satisfactory requirements. Such as increasing bearing poor tolerance level; Appropriate increase of clearance. Use special materials and the structure of the improved cage; Change the lubrication method, such as lubrication oil and gas, oil mist and spray; Improve the cooling condition, etc.