**Analysis of the Raceway Noise Characteristics of NSK Bearings**
Home > Bearing Knowledge > Characteristics of the Raceway Noise of NSK Bearings
Source: Bearing Network | Date: January 24, 2014
When an NSK bearing rotates, the rolling elements move along the raceway, generating a smooth and continuous sound. This is commonly referred to as the "rolling sound." In most cases, this noise is not loud enough to draw attention, as its sound pressure level is relatively low. For example, the noise level of a 6203 NSK bearing under normal conditions typically ranges between 25 to 27 dB. This type of noise is most commonly associated with single-row deep groove ball bearings that are designed to handle radial loads.
Some key characteristics of the raceway noise in NSK bearings include:
- **Random noise and vibration**: The sound and vibration levels can vary unpredictably.
- **High-frequency oscillation**: The frequency of the oscillation is usually above 1 kHz.
- **Stable main frequency**: Regardless of the rotational speed, the primary noise frequency remains largely unchanged, although the sound pressure level increases with speed.
- **Impact of radial clearance**: An increase in radial clearance leads to a significant rise in noise level.
- **Effect of housing rigidity**: A stiffer bearing housing helps reduce overall noise, even at higher speeds.
- **Grease properties**: Higher viscosity grease tends to lower noise levels, but factors like grease consistency, soap fiber structure, and lubrication quality also influence the noise output.
The source of raceway noise is often attributed to the natural vibrations of the inner or outer ring caused by the load. These vibrations occur due to the nonlinear oscillating system formed by the elastic contact between the rings and the rolling elements. If the surface finish or machining precision is not optimal, these small irregularities can trigger additional natural oscillations, which then propagate into audible noise.
Even with the highest manufacturing standards, it's nearly impossible to eliminate all minor imperfections on bearing components. These tiny irregularities can cause slight movements between the rolling elements, leading to vibrations that contribute to the overall noise level.
Although raceway noise is unavoidable, there are several ways to minimize it. Using high-precision machined parts, selecting the right NSK bearing for the application, and ensuring proper installation and maintenance can significantly reduce noise and vibration. Proper lubrication and regular inspection also play a crucial role in maintaining quiet operation.
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