By using the method of lubrication to prevent er ladder er bearing failure knowledge introduction - bearing

Raceway tilt peeling: grace in ladder, bearing on the working plane is inclined to spalling band, bearing is inclined in a state of work, when the tilt Angle to achieve or exceed the critical state, easy early rapid wear of the abnormal formation and spalling. Reason is mainly due to bad installation, axis deflection, journal and low accuracy of the shell hole, take measures to ensure that the bearing installation quality and enhance the axial runout precision of shoulder and shoulder. Ring fracture: ring fracture failure are rare and often sudden overload. Of more complex causes, such as raw materials defects (er ladder er bearing Bubbles, shrinkage) And forging defects ( Burnt) , heat treatment defects ( Overheating) , processing defects ( Local burn or surface micro cracks) , host defects ( Bad installation, poor lubrication, instantaneous overload) Etc. , once the overload shock load or violent vibration could make the ring fracture. To take countermeasures to avoid overload impact load, and the choice of appropriate amount of interference, improve the installation accuracy, improve the conditions of use and to strengthen the quality control in the process of bearing manufacturing. Channel in the circumferential direction is symmetric position peeling: symmetric position, lap is a band around the flake peeling performance, however the outer circumferential symmetry position flake ( The short axis of the ellipse) Too much, the reason is mainly because the shell holes elliptic or two separate enclosure structure, this especially in the motorcycle camshaft bearings. When the needle roller bearing pressure into the big elliptical shell hole or two separate enclosure binding, the er ladder er elliptical bearing outer ring, in the short axis clearance significantly reduced or even negative clearance. Bearing under the action of load, inner ring circumferential crumbling, produced by the rotation of outer ring only in the short axis symmetry position crumbling. This is the bearing of the main causes of early failure, the failure of the bearing parts inspection shows that the bearing outside diameter roundness is from the original process control of 0. 8 microns to 27 microns. This value is much larger than radial clearance value. Therefore, to be sure the bearing is working under severe deformation and negative clearance, easy early formation on the working plane abnormal wear and spalling sharply. The strategy is to improve the housing holes machining precision or not as much as possible using the separation structures in a shell hole two and a half. Due to temperature lubrication, rotational speed, load, the influence of environment, the temperature range of values in the table only said roughly. Bearing lubrication effect of lubrication on the fatigue life of rolling bearing, friction and wear, temperature rise, vibration and so on have important influence, not normal lubrication, ladder bearing cannot work. Analyze the failure reasons of bearing show that about 40% of the bearing damage is related to bad lubrication. Therefore, good lubrication of the bearing is an effective measure to reduce the bearing friction and wear. In addition, the bearing lubrication and cooling, sealing, rust and moderate impact of a number of roles, the effect of bearing lubrication can be briefly stated below: a. The contact between two rolling or sliding surface formed between a layer of oil film separates two surface, reduce the friction and wear of contact surface. b。 Using oil lubrication, especially the circulating oil lubrication, oil mist lubrication and oil lubrication, the bearing lubricating oil take most of the internal friction heat, effective heat dissipation effect. c。 Using grease lubrication, can prevent external dust and other foreign body into the bearings, sealing effect. d。 Lubricant function to prevent corrosion of metal. e. Extension ladder well bearing fatigue life.