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| Sound Description of Needle Roller Bearings | Features | Cause of occurrence |
|---|---|---|
| Zha Zha Ga Ga |
Sound quality does not vary with the speed of rotation (dust/foreign matter) Sound quality varies with rotation speed (scratches) |
Dust/Foreign Body Track Surface, Ball, Rough Roller Surface, Ball, Roller Surface Scratch |
| ZiLa | Small bearing | Track Surface, Ball, Roller Surface Roughness |
| ZiLa-ZiLa | Discontinuous and regular occurrence | Contact with sealing ring, retainer and sealing cover |
| Wuwu Didi Roar |
Because of the change of rotating speed, the size and height are changed. The sound becomes louder as it rotates at a specific speed. There are also times when there are similar alarms or flute sounds. | Resonance, poor fit (bad shaft shape) Track Surface Deformation Track surface, ball, roller ripple (large bearings with mild sound are normal) |
| Gazi Gazi | Feelings of manual rotation |
Track surface scratches (regular) Scratches on balls or rollers (irregular) Dust/Foreign Body, Track Surface Deformation (Partial Gap is Negative) |
| Long Long | Large bearing, continuous sound at high speed, small bearing | Track Surface, Ball, Roller Surface Scratch |
| Wu Weng | Stop instantly when power is cut off | Motor electromagnetic sound |
| Zhila Zhila | Irregular occurrence (variation of non-rotating speed), mainly for small bearings | Mix in dust/foreign matter |
| Ding Dang | Tapered roller bearings, regular and high-speed continuous sound, large bearings, small bearings | It's normal if the retainer's voice is clear. If the grease is not comfortable soft at low temperature, it is good. Because of internal wear of retainer, insufficient lubrication and insufficient bearing load. |
| Hua La | It is more obvious at low speed < br />. Continuous sound at high speed |
The shock sound inside the retainer is not sufficiently lubricated. After reducing the internal clearance or preloading, the abnormal sound disappears. If all the rollers are used, the impact sound between the rollers will occur. |
| Bang Bang | Larger metal impact sound Low-speed thin-walled large bearings (TTB) and so on. |
Rotary torn sound Track Wheel Deformation Squeak |
| Guang Guang | The main reason is that cylindrical roller bearings change with the change of rotating speed. When the sound is loud, the metal sound can be heard. When the lubricant is added, it will stop for a while. |
Excessive Thickness of Lubricating Oil Excessive radial internal clearance Insufficient lubricating oil |
| Qiang Qiang | Intermetallic occlusion Sharp tone |
Roller and Edge Bite of Roller Bearing Small internal clearance Insufficient lubricating oil |
| Pi La | Irregular Sound Occurring in Small Bearings | Bubble Breakage Sound in Lubricating Oil |
| Paca Paca | Irregular squeak | Slipping of mating part Creaking of mounting surface The squeak of keys, etc. |
| Excessive sound pressure |
Track surface, rollers, rough surface of balls Deformation of track surface, rollers and balls due to friction Excessive internal clearance due to friction |
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