Talk about "bearing knowledge"

Source: China Bearing Network Time: 2014-09-27

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According to the application experience; the most suitable working clearance of the ball bearing is close to zero, the roller bearing should adhere to a small amount of working clearance. In the parts with excellent support rigidity, the bearing can with a certain value of pre-tightening force. Here special It is pointed out that the so-called working clearance refers to the clearance of the bearing under the practical working conditions. There is also a kind of clearance called the original clearance; it refers to the clearance before the bearing is installed. The original clearance is larger than the device clearance. Let's swim The choice of gap; the first is to choose the appropriate job clearance.
The radial clearance of various types of bearings can be found in the rules of national regulations.
1. The lifespan L of the calculation of the lifespan and reliability is determined according to the total accumulated time that the equipment is expected to operate; the common unit is the number of hours of operation; the calculation of the lifespan can also be indicated by the total number of revolutions of the bearing; In the process of lifespan; it is necessary to think about all kinds of work conditions. Is the equipment operation an eight-hour shift or an operating day? Can it be used all day long? Can it start and stop for a long time once it starts? Table 1 4 gives the general service life values â€‹â€‹for various power transmission applications.
It is also necessary to think about the cost, the probability of life and the invalidation; it is the cost of the replacement of the equipment after the long-term use of the equipment is still fixed (including replacement bearings).
2. The public service level selects the bearing's common grade; the first is based on the shaft's rotation accuracy requirements. In general, for example, a spur gear reducer with large meshing and public service; available PO grade bearings; but some pairs of rotation accuracy There are shafts with strict requirements or high speed; for high-precision, small-jumping machine spindles, bearings with higher than PO grades are used.
When selecting a bearing with a high level of public service; the production of the outer casing of the shaft should be compatible with the public service level of the bearing; and it should have a satisfactory layout stiffness. Table 1 3 lists examples of the selection of the bearing public service level; for reference.
Of course; the reliability of the bearing is a primary consideration when determining the number of life required for the resolution; the standard of reliability in the bearing industry is generally 90%; that is to say; a lot of work in the same use case In the bearing; 90% of the bearings are still indispensable when they reach the selected bearing life (L life); assuming the demand power loss is low; then the lifespan L of the demand needs to be modified.
Improve bearing reliability; make it more reliable than 90%; can be processed with a 10% loss of power specification bearing life. In other words, suppose you want to achieve higher reliability; it is necessary to reduce the life of the bearing. For example: for a bearing with a reliability of 96%; it is necessary to say that the bearing life is L; instead of L. Without increasing the bearing scale; you need to reduce the life of the original L bearing.
In the following we will give the dynamic bearing capacity of a given bearing; it is a function of speed, bearing practical load and lifespan. For a given use case; speed and practice load are given; thus dynamic loading Can be a function of the lifespan. In order to improve the reliability to 96%; you can increase the size of the bearing; then reach the same level of operational reliability of 90%; that is, you can improve its dynamic bearing capacity; Make it higher than the value required for 90% reliability; this requires picking a larger bearing.

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