Bearing noise

**Bearing Noise: Types and Causes** Home > Bearing Knowledge > Types of Bearing Noise Source: Bearing Network | Date: January 25, 2013 --- Bearing noise is a common issue that can affect the performance and lifespan of mechanical systems. Understanding the different types of bearing noise helps in identifying the root cause and implementing appropriate solutions. 1. **Rolling Track Noise** This type of noise occurs when rolling elements move along the raceway during rotation. It produces a smooth and continuous sound. Under normal conditions, this noise is typically low-level, with a sound pressure level of about 25–27 dB for a 6203 bearing. The characteristics include: - Random noise and vibration. - Oscillation frequency above 1 kHz. - The main frequency remains almost constant regardless of speed, but sound pressure increases with higher speeds. - Radial clearance significantly affects the noise level—larger clearance increases sound pressure. - Higher rigidity of the housing reduces the overall sound pressure. - Grease viscosity also plays a role; higher viscosity may reduce noise. The origin of this noise lies in the natural oscillation of the inner and outer rings caused by load distribution. Even with high-quality manufacturing, minor imperfections can lead to small vibrations, which become audible as noise. To minimize this, it's essential to use high-precision bearings, ensure proper installation, and maintain good lubrication. 2. **Rolling Element Drop Noise** This type of noise is common in large bearings operating under low radial loads. When the bearing rotates, the rolling elements may fall into the non-loaded area, causing impact and vibration. Key features include: - More likely to occur with thick grease than oil. - Common in cold weather. - Happens when there is a large radial clearance. - May be continuous or intermittent. - Can generate second- and third-order oscillations in the outer ring. To reduce this noise, preloading the bearing or using lightweight rolling elements (such as ceramic or hollow rollers) can help. 3. **Squeaking Noise** This is a sharp, metallic squeak that usually occurs without significant temperature rise. It is more common in greased bearings and less frequent in oil-lubricated ones. Characteristics include: - More likely to occur with larger bearings. - Often appears in winter. - Irregular and unpredictable, influenced by grease filling and operating conditions. - Can be reduced by minimizing radial clearance and using shallow outer raceways. 4. **Cage Noise** This noise results from the cage vibrating and colliding with the rolling elements or rings. It is typically low-frequency and present in all bearing types. Features include: - Occurs in both metal and plastic cages. - Present in both oil and grease lubrication. - More likely when the outer ring is subjected to bending moments or has excessive clearance. While it’s hard to completely eliminate, reducing installation errors and improving cage design can help minimize this noise. 5. **Rolling Element Oscillation Noise** When a bearing operates under radial load, only a few rolling elements are in contact with the load zone. This causes periodic oscillations, leading to noise, especially at low speeds. Factors influencing the amplitude include: - Bearing type - Radial load - Radial clearance - Number of rolling elements Proper selection and maintenance of bearings can help reduce this type of noise. --- **How to Reduce Bearing Noise** - Ensure stable movement of the rolling elements by selecting appropriate guidance methods and maintaining smooth surfaces. - Use bearings with smaller pocket gaps at high speeds to reduce oscillation. - Minimize radial clearance to reduce vibration. - Improve the quality of the cage and rolling elements to reduce collisions. - Maintain clean bearings through proper cleaning and handling techniques. --- **Related Articles** - The Influence of Bearing Layout on Vibration and Noise - NSK Bearings: How to Reuse Bearings Without Lubrication in Aluminum Casting Machines - NSK Bearing Operation Tips for Rolling Mill Equipment Link to: [China Bearing Network](http://www.chinabearing.net) Previous: NSK Bearing Contact and Load Type Next: Methods to Replace "Metal Damage Machine Bearings"

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