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Many customers may sometimes have such questions when using NTN bearings. High speed NTN bearings require the rotary system where NTN bearings are located to undergo precise dynamic balancing. Why do some NTN bearings have cages while others do not.
NTN bearing is divided into two structures with and without cage. Among them, large NTN bearings are generally required to bear large loads, often without cages, but filled with rolling elements between the inner and outer raceways. Most small and medium-sized rolling NTN bearings are equipped with characteristics of NTN bearing cage.
In the processing process of NTN bearings, the characteristics of NTN bearing cage also has a great impact on the rigidity of NTN bearings. How do the outer ring, inner ring, rolling element and cage of NTN bearings fit together. To put it simply, first put the inner and outer rings of NTN bearing, put the inner ring aside, then put the rolling element (put it aside), then adjust the position of the rolling element, and then put the cage.Cages are also involved in the processing of characteristics of NTN bearing cage, so what is the main role of NTN bearing cages?
Single row centripetal ball NTN bearings and short cylindrical roller characteristics of NTN bearing cage have low-noise varieties for motor NTN bearings and drive the rolling elements to roll on the correct raceway;
The cage separates the rolling elements at an equal distance and evenly distributes them on the circumference of the raceway to prevent the rolling elements from colliding and rubbing each other during operation;
In the separate characteristics of NTN bearing cage, the rolling element and a ferrule are combined to prevent the rolling element from falling off.
NTN bearings are called windows, which are used to isolate and rolling elements. The actual situation of the passing vibration of steel balls in ball characteristics of NTN bearing cage at low speed is basically consistent with the theoretical calculation value. The pocket clearance makes the cage have a certain amount of activity in the radial and axial directions. The total amount of radial activity is called the cage clearance. There are many structural types and complex shapes in roller cages.
There are many equally spaced pockets on the cage. The shape of the pockets is spherical, circular, elliptical, rectangular and toothed, and its size is larger than the size of the rolling body. The difference between the two is the pocket gap. Sometimes, the connecting part between the windows of the rolling cage is called lintel, which plays the role of connecting and increasing the strength of the cage.
Check the sound condition of NTN imported bearing when rolling. Because NTN imported bearing will produce abnormal sound and irregular sound even if it has slight peeling and other damage, so it can be distinguished by using a sound detector. Using a sound detector, check the size and sound quality of the rolling sound of NTN imported bearing in operation, which plays a preventive role in advance.
Check the temperature of the characteristics of NTN bearing cage when it rotates. If the outer ring temperature of the NTN inlet bearing can be directly measured by using the oil hole, it is more appropriate. Generally, the temperature of NTN inlet bearing can be inferred from the temperature outside the NTN inlet bearing chamber. If the lubrication and installation parts are appropriate, the NTN inlet bearing temperature will rise sharply, and abnormal high temperature will occur. At this time, the operation must be stopped and necessary preventive measures must be taken.