is smaller than that of sliding bearing and the transmission efficiency is high. Generally, the friction coefficient of sliding bearing is 0.08-0.12, while that of rolling bearing is only 0.001-0.005;
serialization and generalization, is suitable for mass production and supply, and is very convenient for use and maintenance;
and heat treated. Therefore, the rolling bearing not only has high mechanical properties and long service life, but also can save the expensive non-ferrous metals used in the manufacture of sliding bearings;
is very small, and the machining accuracy of all parts is high. Therefore, the operation accuracy is high. At the same time, the rigidity of the bearing can be increased by preloading. This is very important for precision machinery;
and axial load at the same time. Therefore, the structure of bearing support can be simplified;
has high transmission efficiency and low heating capacity, it can reduce the consumption of lubricating oil and save trouble in lubrication maintenance;
conveniently applied to any position in space.
is much smaller than that of sliding bearing with the same volume. Therefore, the radial dimension is large. Therefore, sliding bearings are often used in occasions bearing large load and occasions requiring small radial size and compact structure (such as crankshaft bearings of internal combustion engines);
are large, especially in the later stage of use. Therefore, it is difficult for rolling bearing to be competent in the occasions with high precision and no vibration. Generally, the effect of selecting sliding bearing is better
such as metal chips. Once foreign matters enter the bearing, intermittent large vibration and noise will be generated, and early damage will also be caused. In addition, rolling bearings are also prone to early damage due to metal clip impurities. Even if there is no early damage, the service life has a certain limit. In short, the service life of rolling bearings is shorter than that of sliding bearings.
rolling bearings have their own advantages and disadvantages and occupy certain application occasions. Therefore, they can not completely replace each other, and develop in a certain direction and expand their own fields. However, due to the outstanding advantages of rolling bearings, there is a trend of latecomers. At present, rolling bearing has developed into the main support type of machinery and is more and more widely used.
namely radial thrust ball bearing, can be loaded with more steel balls, its radial bearing capacity is greater than that of ordinary ball bearing, and can also bear large axial load or pure axial load at the same time. Its allowable working speed is similar to that of deep groove ball bearing and its support rigidity is stronger, but it requires accurate installation and is very sensitive to axis misalignment error,
Generally, it does not need to bear the radial load alone, but it must bring additional axial load while bearing the radial load. This kind of bearing has many variants and is widely used. It is often made into three series with 15 °, 25 ° and 40 ° contact angles. The larger the contact angle is, the higher its axial load capacity is. However, it is appropriate to use a small contact angle at high speed.
Most of these bearings are used in pairs for small-span rigid double support shafts or precision spindles. When in use, the clearance should be carefully adjusted. By changing the axial distance between the inner and outer rings of the bearing, the internal clearance of the bearing can be adjusted.
At the same time, several sets of bearings can be installed in parallel and given a certain pre interference, which can improve the rigidity of the bearing system.