developed on the basis of sliding bearing is to replace sliding friction with rolling friction. It is generally composed of two rings, a group of rolling elements and a cage. It is a mechanical basic part with strong universality, high standardization and high degree of serialization. Due to different working conditions of various machines, different requirements are put forward for rolling bearings in terms of load capacity, structure and service performance.
However, the basic structure is composed of inner ring, outer ring, rolling element and cage. The functions of various parts in the bearing are: For radial bearings, the inner ring usually fits tightly with the shaft and runs together with the shaft. The outer ring usually forms a transitional fit with the bearing seat or mechanical shell hole to play a supporting role.
the inner ring is fixed to play a supporting role, or both the inner ring and the outer ring operate at the same time. For thrust bearing, it is called shaft ring which is tightly matched with the shaft and moves together, and it is called seat ring which is in transition fit with the bearing seat or mechanical shell hole and plays a supporting role.
are usually evenly arranged between two rings in the bearing for rolling movement with the help of cage. Its shape, size and quantity directly affect the load capacity and service performance of the bearing. Cage can not only evenly separate the rolling elements, but also rotate the rolling elements and improve the internal lubrication performance of the bearing.
of rolling bearing 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;
has realized standardization, serialization and generalization, is suitable for mass production and supply, and is very convenient for use and maintenance;
is made of bearing steel 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;
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;
can bear radial load 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.
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.