The speed of the bearing is mainly limited by the temperature rise caused by the frictional heat inside the bearing. When the speed exceeds a certain limit, the bearing cannot continue to rotate due to burns. The limit rotation speed of the bearing refers to a limit value that does not cause frictional heating that causes burns and can continuously rotate.
Therefore, the ultimate speed of the bearing depends on the type, size and precision of the bearing as well as the lubrication method, the quality and quantity of the lubricant, the material and type of the cage, and the load conditions. The limit speeds of various types of bearings using grease lubrication and oil lubrication (oil bath lubrication) are respectively included in the bearing size table. The values indicate the standard design of the bearing under normal load conditions (C/P>=13, Fa/Fr<= 0.25 or so) The limit value of the rotation speed when rotating downward. In addition, depending on the type and grade of the lubricant, the lubricant may be superior to other properties but not suitable for high-speed rotation.
The corrected load condition of the limit speed C/P<13 (that is, the equivalent dynamic load P exceeds 8% of the basic dynamic load C), or the axial load in the combined combined load exceeds 25% of the radial load. The following formula corrects the limit speed. Na=f1*f2*n where na: corrected limit speed, rpm f1: correction factor f2 related to load conditions: correction factor n related to combined load: limit speed under normal load conditions, rpm (refer to bearing size Table) C: Basic dynamic load rating, N{kgf} P : Equivalent dynamic load, N{kgf} Fr: Radial load, N{kgf} Fa: Axial load, N{kgf} Limit of ball bearing with seal ring Speed limit with contact seal (RS type) Ball bearings are limited by the line speed of the seal contact surface, allowing the line speed to depend on the rubber material of the seal.
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