The Influencing Factors of Oscillation in NTN Bearings

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Mechanical oscillations in NTN bearings are transmitted through elastic waves that travel through air or other mediums. These vibrations can be perceived by the human auditory system and are commonly referred to as sound. The perception of sound depends on both frequency and intensity, and when these factors negatively affect the mind or the body, they are classified as noise. In the case of NTN bearings, the working noise is an important quality parameter. It is measured under specific conditions, such as when the bearing is rotating, and it is determined by the sound pressure level captured directly by a microphone placed at a certain angle relative to the bearing. This measurement helps assess the performance and reliability of the bearing during operation. The axial load applied to the outer ring of the NTN bearing is distributed evenly through three flexible, equally spaced cymbals arranged around the circumference. The alignment of the load application line with the mandrel axis must not exceed 0.20 mm in coaxiality and 0.05 mm in straightness. Additionally, the stiffness of the flexible load pads should not interfere with the bearing's natural oscillation, and the resonant frequency of the loading system should fall outside the operating frequency range of the bearing to avoid interference. While oscillation and noise are closely related, they are not the same. The requirements for each vary depending on the application. For example, in automotive, aerospace, and motor applications, low noise levels are typically desired. However, in precision machine tools, minimal oscillation is more critical. In many cases, noise measurement is considered more important due to its simplicity, and often, noise measurement equipment or ambient noise testing is used instead of direct oscillation measurement. Within the intermediate frequency range, both measurements have a practical correlation, making this substitution effective and widely accepted.

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