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Coat of SKF bearings and seals hood clearance, oil spills, discoloration, bearing out, crack, rust, etc. Examine the characteristics appearance once found in fault, will be seriously careful judgment, determine accurate parts failure. Shaft end outer ring and two seals hood clearance is too large, found between the front and rear bearing outer ring and seal hood clearance is too large, and have more grease overflow, it is the bearing outer ring cracked.
1, split load is too large: check the load size. Correct loading conditions. Installing bad (non-linear) once again, check the size of the load and Institute the use of SKF bearings. Correct loading conditions.
2, torque loads intrusion of foreign bodies, water: improving the sealing device, outage rust. Improving the surface finish of paired scroll parts. Showing a dark side with minor wear, how in the dark on the surface from the surface to deep to 5-10m of tiny cracks, and within the larger scope of tiny particles (micro-split) fracture when installed by combat. Improved sealing device.
3, poor lubrication, lubricants are not appropriate: use the proper viscosity of lubricants, improved lubrication method. Paired scroll part surface finish is not good. Foreign bodies entering the lubricant. Select the appropriate lubricant.
4, bearing clearance is not appropriate. Bad bearing box precision, rigidity of bearing box does not have: check the accuracy of the shaft and housing. Check the clearance.
5, large deflections of the shafts rust, corrosion, abrasions and indentation checking of axle and bearing box accuracy. SKF bearing under load when you rotate, inner ring, outer ring raceway surface or scroll a decent rendering fish squamous split due to rolling fatigue phenomena. So-called card part of the injury is due to the sliding surface injury summary of minor burns resulting from surface damage. Caused by poor lubricant surface roughness. Stripping lubricant is inappropriate. Improving lubricant and lubrication method.
SKF bearing grease is usually indicated by a apparent viscosity viscosity or similar, in the description when the viscosity of the grease, you must indicate the temperature and cutting speed. Similar viscosity index can be used to control the low-temperature fluidity and pumping.
One important indicator for measuring the low temperature performance of bearing grease is low-temperature torque, that at low temperatures (below-20 ° c) bearing grease block low-speed flow rotating level, low-temperature torque of grease from starting torque and rotational torque after the 60mm of average.
SKF bearing greases of evaporation (degrees) when expressed in long-term use under high temperature lubricating grease, grease oil content levels of volatile, evaporating the smaller the better. Grease made of evaporation depends largely on the nature of the oil and fractions.
SKF bearing metallurgical quality of the materials used to be the main factors affecting the early failure of rolling bearings. As metallurgical technology (such as bearings, such as vacuum degassing of steel) of the progress, raw materials quality has been improved. Raw materials of quality factors in the failure analysis of bearing the proportion has declined significantly, but it is still one of the main factors bearing failure. Selection of propriety are still bearing failure analysis of factors that must be taken into account.
SKF bearing failure analysis of main tasks is based on the large amount of background material, analysis of data and failure mode, identify the main factors causing bearing failure, so targeted for improvement measures, extending the service period of bearing, avoid unexpected early bearing failure.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 638ZZ1 NSK | 8 | 28 | 9 |
| 628ZZ NSK | 8 | 24 | 8 |