Limit speed problem and noise treatment method of SKF Bearing
Limit speed problem and noise treatment method of SKF Bearing
2022年4月25日
Main factors affecting grinding deterioration layer of SKF Bearing
Main factors affecting grinding deterioration layer of SKF Bearing
2022年4月26日

Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing

  • For the measurement of the coaxiality of the main bearing hole of the engine block, the coaxiality dimension of the diesel engine block must be measured accurately, and the runout of the crankshaft must be measured at the same time, so as to select the thickness of the bearing bush to make the oil lubrication clearance consistent in each shaft position. 
  • If the diesel engine is over rolled and runs fast, the coaxiality of the main IKO bearing hole of the engine body must be tested before assembly. The total length of the nodular iron crankshaft is no more than 0.14mm and the total length of the steel crankshaft is no more than 0.12mm. Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing

At the same time, cylindricity ofJoint Bearing hole of the engine body. 

  • If it exceeds the limit, it is forbidden. If it is within the limit, the grinding method (i.e. apply an appropriate amount of red lead powder on the bearing bush, install it into the crankshaft and rotate it, then remove the rod end joint bearing cover to check the bearing bush. 
  • After scraping the protruding parts with hard points, measure the change of size, so as to ensure the reliability of use.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
  •  Use position: in order to check whether the installation is correct, operation inspection shall be carried out. Small machinery can be rotated by hand to confirm whether it rotates smoothly. 
  • The inspection items include poor operation caused by foreign matters, scars and indentation, unstable torque caused by poor installation and poor processing of mounting base, excessive torque caused by too small clearance, installation error and sealing friction, etc. If there is no abnormality, the power operation can be started.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
  • IKO bearing is suitable for bearing the combined radial and axial load dominated by radial load. It is usually used in pairs with two sets of bearings. It is mainly used in the transmission parts of automobile, such as front and rear hubs, driving bevel gears, differential, reducer and so on.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
  •  Allowable speed: under the condition of correct installation and good lubrication, the allowable speed is 0.3-0.5 times of the limit speed of rod end joint bearing. Under normal conditions, it is appropriate to use 0.2 times of the limit speed.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
  •  Allowable tilt angle: IKO bearings generally do not allow the shaft to tilt relative to the shell hole. If there is any tilt, the greater is no more than 2 ‘.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
  •  Allowable temperature: under the condition of bearing normal load, high temperature resistance of lubricant and sufficient lubrication, the general bearing is allowed to work at the ambient temperature of – 30 ℃ – 150 ℃.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
  • When IKO bearing is to be used after being removed, appropriate disassembly tools shall be selected. When disassembling the ferrule with interference fit, only the tension can be added to the ferrule, and it is not allowed to transfer the disassembly force through the rolling element, otherwise the rolling element and raceway will be crushed. Lubricants are important not only for bearings, but also for all rod end plain bearings. However, please note that the bearing should not add too much grease. Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
  • Then it’s time to change the lubricant of the bearing. After draining the old engine oil, if possible, the bearings lubricated with engine oil should be filled with fresh engine oil and let the machine rotate at low speed for a few minutes. Make the oil collect residual pollutants as much as possible, and then drain the oil. 
  • When replacing the grease of the bearing lubricated with grease, the Joe remover used should avoid the contact of cotton with any part of the rod end joint bearing. Because these residual fibers may wedge between rolling parts and cause damage, especially in the application of IKO bearing. 
  • Some matters needing attention in the installation of thin-walled cross roller bearing, such as the perpendicularity of shaft ring and shaft centerline, the accuracy of bearing device or the condition after reverse installation, etc. the following is the introduction of skills and methods.

 Prevent Overheating and Burning of IKO Rod End Joint Bearing

  • The joint venture between thin-walled cross roller bearing and shaft is generally transition joint venture, and the joint venture between race and bearing seat hole is generally clearance joint venture. 
  • The middle shaft ring of the two-way bearing shall be fixed on the shaft to avoid the migration and transformation of the shaft. The installation method of bearing is mostly the change of shaft under common conditions. Therefore, the joint venture between inner ring and shaft is win-win joint venture, and the joint venture between bearing outer ring and bearing chamber is clearance joint venture.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
  • When the thin-walled cross roller bearing operates under the load of 0.1C, the contact stress between the rolling element and the contact surface of the raceway increases, resulting in the increase of the working temperature of the bearing and the relative deterioration of the performance of the lubricant. Therefore, the limit speed of the bearing will be reduced accordingly.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
  • For the range of C / = 10, the reduction of limit speed is very small, so it can be ignored, that is, F1 = 1.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
  • For the centripetal bearing under combined load, due to the increase of the number of rolling elements under load, the increase of friction resistance, the increase of calorific value, the deterioration of lubrication and cooling conditions, and the increase of force acting on the cage, the limit speed of thin-walled cross roller bearing must be adjusted by multiplying a reduction factor F2 according to the bearing type and load angle.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing

The method adopted after tightening the screw and nut clearance IKO Rod End Joint Bearing

  •  In this case, adjust the friction torque on the hand side with an appropriate preload to determine the start.
  • The so-called constant pressure preload is the use of coil springs and Belleville springs to give the load-bearing of appropriate preparation methods. When in use, even if the relative position of the Koyo inlet bearing changes, the preloading method. When in use, it will even change its relative position, and the preload can be maintained at a certain level.
  • After draining the old engine oil, if possible, the bearings lubricated with engine oil should be filled with fresh engine oil and let the machine rotate at low speed for a few minutes. Make the oil collect residual pollutants as much as possible, and then drain the oil. Note: the engine oil is filtered before use.
  • When replacing the grease of the bearing lubricated with grease, the Joe remover used shall avoid the contact of cotton with any part of the bearing. Because these residual fibers may wedge between rolling parts and cause damage, especially in the application of small bearings.
  • When inspecting Koyo imported bearings, never expose the bearings to pollutants or moisture. If the work is interrupted, the machine shall be covered with oil paper, plastic sheet or similar materials.
  • Tile surface corrosion: abnormal concentration of non-ferrous metal elements is found by spectral analysis; Submicron wear particles with many non-ferrous metal components appear in ferrography; The water content and acid value of lubricating oil exceed the standard.
  • Journal surface strain: there are ferrous cutting abrasive particles or black oxide particles in the ferrogram, and there is tempering color on the metal surface.
  • Journal surface corrosion: the spectral analysis found that the concentration of iron was abnormal. There were many submicron particles of iron in the ferrogram, and the water content or acid value of lubricating oil exceeded the standard.
  • Surface strain: cutting abrasive particles are found in the Ferrograph, and the abrasive particles are composed of non-ferrous metals.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing

Fretting wear of tile back: abnormal iron concentration is found by spectral analysis. 

  • There are many iron components, submicron wear particles, abnormal moisture and acid value of lubricating oil in the ferrogram.
  • Under the condition of liquid lubrication, the sliding surface is separated by lubricating oil without direct contact, which can also greatly reduce the friction loss and surface wear, and the oil film also has a certain vibration absorption ability
  • Oyo bearing faults are often due to a variety of factors, the influence of all design and manufacturing process factors and bearing faults, and their analysis is not easy to determine. Under normal circumstances, in general, you can consider and analyze factors and internal factors.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
  • The main factors used for adjustment are installation, use and maintenance, maintenance and repair, which meet the technical requirements. The installation condition is one of the factors for using Koyo bearings. It is the primary factor of the load-bearing force that often causes the state change between various parts of the incorrect installation package, and the operation in abnormal state and early failure. Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
  • Monitor and inspect the contact load, speed, temperature, vibration, noise and lubrication status of the operating bearing according to the technical requirements of bearing installation, use, maintenance and maintenance. If any abnormality is found, find the cause immediately and adjust it back to normal. In addition, the quality of oil and surrounding media and atmosphere are also very important for analysis and testing.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
  • The chamfer of the bearing does not determine the quality of the bearing, but reflects the processing method of the bearing. The chamfering is black, which means that after quenching and other heat treatment, the hardness of the bearing can be improved. Some people think that the chamfering is black, which is not good-looking and is not completely processed. This is a misunderstanding.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
  • The integrated cage is better than the two bodies. Although the new technology uses the integrated cage, it only saves materials, and its performance on rotation is worse than that of the two bodies. The chamfering of Koyo bearings does not determine the quality of the bearings. Some people think that the chamfering is black and unsightly because it is not completely processed. This is a misunderstanding.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing

Internal factors mainly refer to structural design, manufacturing process and materials. 

  • There are three factors that determine the quality of bearings.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
  • First of all, the structural design and advanced at the same time, there will be a longer Koyo bearing life. Bearing manufacturing will go through multiple processes of forging, heat treatment, turning, grinding and assembly. The rationality, advanced nature and stability of the treatment will also affect the service life of the bearing.
  •  The influence of bearing heat treatment and grinding process is often more directly related to bearing failure, which is related to product quality. In recent years, the deterioration of bearing surface layer shows that the grinding process is closely related to the bearing surface quality.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
  • The metallurgical quality of bearing materials is the main factor affecting the early failure of rolling bearings. With the progress of Metallurgical Technology (such as bearing steel, vacuum degassing, etc.), the quality of raw materials has been improved. The proportion of raw material quality factor in bearing fault analysis has decreased significantly, but it is still one of the main factors of Koyo bearing failure. Whether the selection is appropriate or not is still a bearing fault analysis that must be considered.Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing