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Bearing Knowledge Encyclopedia (3)
Source: Bearing network time: 2014-04-21
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About the same type of bearing; the scale of the more. City 碜儆. When selecting the bearing; should note that the actual speed is lower than the limit speed.
? Bearing travel and axial displacement are usually; a shaft is supported by two bearings at a certain interval. In order to get used to the different degrees of heat rise of the shaft and the casing; a bearing should be fixed in the axial direction; A bearing makes it possible to swim on the shaft (ie, swimming support); to avoid the phenomenon of jamming caused by the elongation or shortening of the shaft. The swimming bearing usually uses a cylindrical roller bearing with no inner or outer ring without ribs. (formerly 2000 type, 32000 type) and needle bearing; this is mainly because the internal structure of this type of bearing allows the shaft and the outer casing to have proper axial displacement. At this moment; the inner ring and the shaft; the outer ring and the outer casing hole can be used in close cooperation. When the ball bearing is not used for the movable support; such as deep groove ball bearing, spherical roller bearing; it is necessary to allow the outer ring and the outer casing hole in the device; or the inner ring and the shaft are loosely cooperative; Can swim freely.
Tapered roller bearings, spherical roller bearings and deep groove ball bearings are basically attributed to the positioning type; when used as non-positioning, loose coupling devices are used. All thrust roller bearings are positioning bearings.
Convenient to the bearing device and when disassembling the selected bearing type; whether it is convenient to disassemble the bearing device; it is also necessary to think thoughtfully; especially for large and extra large bearing devices and disassembly is particularly important. The usual outer ring can be separated Angle touch ball bearings, tapered roller bearings, cylindrical roller bearings and needle bearings; the device is relatively easy to disassemble; their inner and outer rings can be attached to the shaft or the housing hole. In addition; the inner diameter with a cone Spherical roller bearings with fixed sleeves, double row cylindrical roller bearings and self-aligning ball bearings; also simple to disassemble.
Other requirements besides the above factors; should also consider the bearing's operating environment temperature, bearing seals and special requirements for conflicting moments, oscillations, noise, etc.
1. The clearance selection clearance is an important factor for the normal operation of the rolling bearing; it is divided into axial clearance and radial clearance. Select the appropriate clearance; the load can be reasonably distributed between the bearing rolling bodies, and the shaft can be restricted. (or outer casing) axial and radial displacement; ensure the rotation accuracy of the shaft, can make the bearing work normally at regular temperature, reduce oscillation and noise; help to improve the life of the bearing. Therefore, when selecting the bearing; It is necessary to pick the right bearing clearance.
When selecting a bearing clearance; consider the following aspects:
1. Bearing operating conditions; such as load, temperature, speed, etc.
2. Demand for bearing performance (rotational accuracy, collision torque, oscillation, noise),
3. When the bearing and the shaft and the casing hole are in interference, the bearing clearance is reduced.
4. When the bearing is in operation; the temperature difference of the inner jacket ring causes the bearing clearance to decrease.
5. The expansion coefficient of the shaft and casing data is different; the bearing clearance is reduced or increased.
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