Thrust ball bearing inspection notice analysis

Is 'hear' : listening to the train wheel vibration of ring and thrust ball bearing friction. Do the train station and check is the first step of the early detection of bearing faults. At present there are many defects in the use of vehicles, such as the tread stripping, partial abrasion and so on, which causes large wheel in the use of vibration, is extremely harmful influence on bearings and components. So, in the train station to check, should focus, attention to the larger rolling bearing vibration detailed examination, early detection hot shaft failure. In the 'look' : thrust ball bearing fault characteristic appearance. Any bearing failure will be reflected from the appearance. Different have different characteristics of fault reflected. These features is the following: coat of thrust ball bearing and seal cover large offshoring, oil spills, discoloration, bearing clearance, crack damage, corrosion, etc. Once found in a check appearance fault characteristics, to seriously careful judgment, determine the accurate parts of the fault. Shaft end gap of outer ring and two seal cover is too big, check the type of 197726 vehicles, found that the bearing outer ring gap of front end and the seal cover is too big, and have more oil overflow, bearing outer ring is split. Thrust ball bearing oil seal cover on both ends of the left is a common appearance bearing fault. And found dumped oil seal cover not loose, and wipe the grease may continue to assemble after use, but must pay attention to the outer ring threaded with crack and the oil leakage, withdrawal of scrapped. It is also a common fault, if found only wire broken, loss of sealing and locking the ear piece check still thes cover bolts on the six aspects, that bolt looseness, should confirm whether the outward thrust ball bearing, offshoring is bearing fault is found, when the axial clearance is too large a withdrawal processing should be done. Such failures are relatively rare. Use check if found in the bearing outer ring corrosion is serious, throughout the corrosion pit, treatment of withdrawal should be done. Electric erosion of the bearing. The cause of thrust ball bearing electric erosion is bogie or upper body welding work current caused by bearing. So the bogie or upper body welding work, should prevent galvanic current through bearings. Use wheel to wheel and rail contact if found in the same section of tread and flange lateral have been edm wounded melt pit, thrust ball bearing a withdrawal decomposition inspection should be done. TIMKEN bearing grease is usually make a similar viscosity or apparent viscosity, said when, on the viscosity of grease must specify the temperature and shear rate. Similar viscosity index can be used to control the low temperature fluidity and pumping. Measuring thrust ball bearing grease performance at low temperature is one of the important index of low temperature torque, namely at low temperature ( - 20 ° c below) Grease block bearing rotational degree of low speed flows, the low temperature torque of the grease by the starting torque and rotation torque after 60 mm average said. The evaporative (TIMKEN bearing grease C) Said in the long-term use under condition of high temperature grease, grease oil volatilization, evaporative as small as possible. The evaporative mainly depends on the nature of the lubricating oil and fat fractions. Oxidation stability is refers to the grease when used in long-term storage or long-term high temperature resistance to heat and oxygen, permanent changes in their ability to maintain its nature will not occur. Due to oxidation, are often free alkali content reduced or free organic acid content increases, drop point drop, dark appearance, appear different smell, consistency, ultimate strength, similar viscosity decreased, generated corrosive product and destroy the material of grease, soap oil separation. In long-term storage of grease, therefore, should be stored in dry and ventilated environment, prevent sun, and shall regularly check free base or free change of the project such as organic acid, corrosion resistance, to ensure its quality and performance.