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High-speed bearings; usually the Dmn value exceeds 1.00106mm. The r/min rolling bearing is called high speed bearing. Here Dm is the uniform diameter of the rolling bearing; n is the inner ring speed. In practice, the Dmn value of the high speed imported bearing has reached 3. 0X106mm. r/min. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
The centrifugal force of the rolling bearing at high speed has a great influence on its life and strength. Therefore, in the structural design of the high-speed bearing, the quality of the rolling body is often used to improve the high-speed function; that is, the ultra-light and ultra-light diameter series are selected; The ceramic ball is used as a roll.
High-speed bearing cages are mostly made of solid cages such as phenolic laminate plastic, polyimide or bronze; to reduce the heat of conflict; silver can also be plated on the guiding surface.
When selecting high-speed bearings; P4 and P2 grade accuracy should be selected; to facilitate the formation of elastic fluid dynamic smooth and heavy-duty high-speed large and medium-sized imported bearings; use small or small bearings with smooth injection, light and high speed; use oil mist smooth or The oil and gas is smooth. But the smoothing method has the highest cost in the three smooth methods; the oil mist is the lowest in cost; the oil and gas smoothness is a new smooth method developed in recent years; it is different from the smooth foundation of the oil mist in that it can handle the most excess oil supply. High-speed bearings are usually made of low-viscosity oil smooth.
The life of high-speed bearings decreases sharply with the increase of Dmn (sometimes dn; d is the inner diameter of the bearing; n is the bearing speed); the failure mode is mainly fatigue damage; secondly, the cage leads to burns due to conflict heat. The cage is cracked and so on.
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High-speed bearing features and selection
Source: China Bearing Network Time: 2013-04-17