When FAG bearings operating under radial load, only a few months of its internal load bearing rolling elements, because the elastic contact with the ferrule constitutes "springs" which supports the rolling line of action of the radial load generated through periodic vibration, Therefore, at the pivot center of the vertical movement or make horizontal direction, at the same time lead to noise. Such vibration by the vibration is called rolling, especially at low speeds is more obvious.

      When FAG bearings operating under radial load, FAG bearing load zone and non-load zone, if the bearing has a certain radial clearance, the non-load zone of rolling element and inner raceway no contact, but the effect of centrifugal force may contacts with the outer end, at low speeds, when the centrifugal force is less than the weight of the rolling elements, scroll down and with the experience of inner raceway or cage FAG Bearings collision and stimulate the natural vibration and noise, and has the following characteristics:

      A grease lubrication is easy to produce, easy to produce oil lubrication. When more likely to have low-grade grease.

      2 Winter often occur.

      3 For radial loads and act only larger radial clearance is also easy to produce.

      4 at a specific range, and will produce different sizes of bearing the speed ranges.

      5 may also be a continuous sound is intermittent sound.

      6 This often forced vibration excitation of the outer ring second, third bending natural vibration, thus the issue of the noise.