NTN one-way bearing the correct use of several failure cases

NTN bearing the correct maintenance and timely maintenance, is an important guarantee for normal operation of the highway mechanical aspects. If the bearing maintenance, maintenance, can work thousands of disappear even longer; On the other hand, makes the service life of the bearing, a big drop in can appear even tile burning, holding shaft and other serious accidents. Usually one-way bearing lubricating oil temperature shall not be higher than 50 ℃. In order to ensure adequate and reliable lubrication, lubricating oil to timely or periodically check the oil level, keep the oil level within the prescribed scope. To keep clean, timely change according to the requirements of product quality. For bearing fault to particular case is particular analysis, and ruled out in time. Bearing of the common faults and processing methods are as follows. ( 1) Bearing heating. If the NTN bearing lubricating oil is insufficient, should go and check whether the oil is unobstructed; If lubricating oil have impurities, should clean bearing, replace the new oil, cleaning filter; If the poor assembly, journal and bearing askew, biased, can be in the bottom of the bearing seat cushion; If the bearing gap is too small, should be to adjust the clearance. ( 2) Axis fever. If the oil baffle or rubber seal on the shaft is too tight, should adjust the packing back cover location; If the shaft and the bearing cover the radial friction, should check and adjust the shaft and bearing radial clearance, general is 0. 25 ~ 0. 3mm。 ( 3) The main friction surface oil quantity is little. If the tubing plugging and oil groove shallow, should be cleaning tube, deepen oil groove; If the oil temperature is low, the liquidity is poor, should be replaced according to the environmental temperature lubricating oil; If the oil ring rotation is slow, poor oil splashing, should check whether the oil ring is off, grazing, the oil level is too high can drain to the standard height; If the adjusting shim block of lubricating oil, check the adjusting shim position. ( 4) The spill. If the oil amount is much, the oil should be adjusted, maintaining the oil level of standard height; If the seal failure, should be compression gland, thickening felt ring or replace the sealing material; If the NTN bearing hole, oil leakage, should replace the bearing or with lead to blocked pores. ( 5) The axial beating. If the bearing gap is too big, should be removed from gasket, adjustment; If a body of revolution, Gear, belt wheel, etc. ) Dynamic balance is not good, should check and adjust active balance; If the bearing is not stable, should tighten bolts bearing; If coupling installed offset is big, should be in the bearing ground and gaskets, adjust the coupling installation accuracy. NTN bearing failure of the main reason is that defects and overload two factors. When the loads more than material strength limit fracture caused by parts called overload fracture. Overload reason mainly is the main engine failure or improper installation. One-way bearing parts of micro crack, shrinkage cavity, bubbles and large foreign impurities, overheating organizations and local burns and other defects during the impact overload or violent vibration will cause fracture in defect, known as defect fracture. It should be pointed out that the bearing in the process of manufacturing, for raw materials into the factory reinspection, forging and heat treatment quality control, process control through instrument analysis of the existence of the above defects and correct still must strengthen control in the future. But in general, usually bearing fracture failure of most for overload failure. NTN bearing in the work, because of the influence of the external or internal factors, change the original fit clearance, lower accuracy, and the change of 'killed' called clearance failure. , large amount of the external factors such as interference of installation does not reach the designated position, temperature rise caused by the expansion, instantaneous overload, etc. , internal factors such as residual austenite and the residual stress in a state of flux and so on all is the main reason for the failure caused by clearance changes.