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Bearing knowledge encyclopedia (2)

Source: China Bearing Network Time: 2014-10-07
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In the direction of the effect of the load; when receiving pure radial load; deep groove ball bearing, cylindrical roller bearing or needle roller bearing can be selected. When accepting small pure axial load; thrust ball bearing can be used to accept larger For pure axial load; thrust roller bearings are available. When the bearing accepts radial and axial combined loads; angular contact ball bearings or tapered roller bearings are generally used.
The centering function of the bearing is different from the center line of the bearing seat; there is a point of view error; or because the two bearing distances of the shaft are large, the rigidity of the shaft is more than that of the shaft. Magnesium 哂 Xin 餍 餍 餍 餍 餍 餍 餍 餍 餍 餍 餍 餍 餍 餍 蚧虻餍 蚧虻餍 蚧虻餍 蚧虻餍 蚧虻餍 馇蛑岢 馇蛑岢 馇蛑岢 馇蛑岢 馇蛑岢 馇蛑岢 馇蛑岢 馇蛑岢 馇蛑岢 此类 此类 此类 此类 此类 此类 此类 此类 此类 此类 此类 此类
The quality of the bearing is good or bad; it is related to the different axis of the same; the larger the value of the axis is, the better the function of the centering is. The different axes of the various types of bearings are shown in Table 1 1
The rigidity of the rigid bearing of the bearing; refers to the force required for the unit deformation of the bearing. The elastic deformation of the rolling bearing is very good. 诖蠖嗍 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 ┗ ┗ ┗ ┗ ┗ ┗ The squatting and swearing 蚴 ∮ ∮ ∮ ∮ ∮ ∮ ∮ 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于.
Other types of bearings can also be pre-tensioned; to achieve the purpose of increasing the rigidity of the support, such as angular touch ball bearings and tapered roller bearings; to avoid shaft oscillation; add support rigidity; often pre-applied a certain axis in the device To force; make them pressed against each other. Here is unique: the pre-tightening amount is not too large. When too large; will increase the bearing conflict; increase the temperature rise; affect the bearing life.
Bearing speed Each bearing type has its own limit speed; it is determined by physical characteristics such as scale, type and layout; the limit speed is the maximum operating speed of the bearing (usually rMmin); beyond this limit Will cause the bearing temperature to rise; the smoothing agent is dry; even the bearing is stuck.
The speed scale required for the application occasion helps to determine the type of bearing used in the resolution; Figure 1 2 shows the typical speed scale of most general bearings. D is the bearing scale; it generally refers to the pitch diameter of the bearing; Time; use the average of the inner and outer diameter of the bearing; unit mm.
Multiplying the pitch diameter D by the shaft rotation speed (in r/min) yields a limit speed factor (DN); DN is important in selecting the bearing type and dimensions. Most bearing manufacturers' catalogues supply their products. The limit speed value; practice proved; the operation is better than 90% below the limit speed.
The limit speed of the grease smooth bearing is lower than the limit speed of the oil smooth bearing; the oil supply method of the bearing has an influence on the reachable limit speed. Table 1 2 provides the limit speed correction coefficient (K) of several bearing smoothing modes. It is necessary Pay attention to; for grease-smooth bearings; its limit speed is generally only 80% of the limit speed when the bearing is selected for a high-quality recirculating oil system; but for oil mist smooth system; its limit speed is generally higher than the same fundamental smooth system 50%.
Persistence of the depiction and layout of the frame also affects the limit speed of the bearing; because the roll and the outer surface of the frame are sliding touches; the use of expensive, well-depicted, high-quality and low-conflict materials; not only can be rolled Separated by the body; and helps to adhere to the smooth oil film that slides the touch area. However, it is cheap to adhere to the frame like a stamping holder; generally it can only make the roll body stick to each other. Therefore, they are prone to accidents and people. Annoying sliding touch; then inducing lower limit speed
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