Necessity of Selecting lubricant for Bearing Maintenance
Necessity of Selecting lubricant for Bearing Maintenance
2022年3月24日
Performance Characteristics of Clearance Maintenance of Fag Plane Needle Roller Bearing
Performance Characteristics of Clearance Maintenance of Fag Plane Needle Roller Bearing
2022年3月25日

Generation and Elimination of Noise of One-Way Thrust Ball Bearing

  • The judgment criteria vary according to mechanical properties, importance and inspection cycle. In case of the following damage, the one-way thrust ball bearing shall not be reused and must be replaced. In the process of using bearings, grease is very critical. If deteriorated grease is used, it will not only fail to play its due role, but also damage the bearing.Generation and Elimination of Noise of One-Way Thrust Ball Bearing

Generation and Elimination of Noise of One-Way Thrust Ball Bearing

  • Twist the lubricating oil between the thumb and index finger and grind it repeatedly. The better lubricating oil hand feels lubricity, less wear debris and no friction. If it feels a large friction feeling such as sand particles between the fingers, it indicates that there are many impurities in the lubricating oil and it can not be used again. It should be replaced with a new lubricating oil.Generation and Elimination of Noise of One-Way Thrust Ball Bearing
  • Raceway sound of one-way thrust ball bearing and its control method raceway sound is a smooth and continuous sound made by the rolling body rolling on the raceway surface when the one-way bearing is running. It is a unique basic sound that will occur in all rolling bearings. 
  • The general bearing sound is the sound of raceway plus other sounds. The raceway sound of ball bearing is irregular, and its frequency is above 1000Hz. Its main frequency does not change with the speed, but its total sound pressure level increases with the speed.Generation and Elimination of Noise of One-Way Thrust Ball Bearing
  •  For the bearing with loud raceway sound, the sound pressure level of raceway sound decreases with the increase of viscosity; For bearings with low raceway noise, the sound pressure level changes from decrease to increase when the viscosity increases to more than 20mm2 / s. The lower the sound level of the bearing, the greater the total sound pressure of the bearing. 
  • If the radial clearance is too small, the total sound pressure level and dominant frequency of raceway sound will increase sharply with the decrease of radial clearance. The methods to control the sound of raceway are: select low-noise bearings, that is, bearings with small waviness, and carefully select the service conditions.
  •  Raceway noise often affects the noise of the whole machinery. Reducing raceway noise can reduce the noise of the whole machinery.Generation and Elimination of Noise of One-Way Thrust Ball Bearing
  • The metallurgical quality of unidirectional thrust ball bearing material was once the main factor affecting the early failure of bearing. With the improvement of Metallurgical Technology (such as vacuum degassing of bearing steel), the quality of raw materials has been improved. 
  • The proportion of raw material quality factor in bearing failure analysis has decreased significantly, but it is still one of the main influencing factors of bearing failure. Proper material selection is still a factor that must be considered in bearing failure analysis.Generation and Elimination of Noise of One-Way Thrust Ball Bearing
  • The main task of failure analysis of one-way thrust ball bearing is to find out the main factors causing bearing failure according to a large number of background materials, analysis data and failure forms, so as to put forward targeted improvement measures, prolong the service life of self-aligning roller bearing and avoid sudden early failure of bearing.
How to judge the failure of bearing grease in use
  • The vibration of one-way thrust ball bearing has a significant effect on the failure of bearing. For example: peeling, indentation, corrosion, crack Wear, etc. will be reflected in the bearing vibration detection, so the vibration can be measured by using special bearing vibration measurement devices (frequency analyzer and vibration instrument, etc.), and the details of abnormal vibration can be inferred from the frequency distribution. 
  • The measured values are different due to the use premise of the bearing or the installation position of the sensor. Therefore, it is necessary to analyze and compare the measured values of each machine in advance and determine the judgment scale.
  • 1. Cause: the inner shell of the bearing runs. Method: replace the bearing and related worn parts
  • 2. Cause: poor lubrication method: select the specified brand of lubricating materials and clean them properly
  • 3. Cause: the belt is too tight. Method: adjust the belt to make it elastic properly.Generation and Elimination of Noise of One-Way Thrust Ball Bearing
  • 4. Cause: the main shaft is bent or the box hole is not concentric. Method: repair the main shaft or box
  • 5. Cause: low assembly quality method: improve assembly quality
  • 6. Cause: low bearing accuracy method: select the bearing with specified accuracy grade
  • 7. Method of excessive axial force: clean and adjust the clearance of sealing ring between 0.2 ~ 0.3mm, correct the diameter of impeller balance hole and verify the static balance value
  • 8. Bearing damage method: replace the bearing
Technical requirements for Timken non-standard bearing