The fit between SKF thrust ball bearing and shaft is generally transition fit, and the fit between seat ring and bearing seat hole is generally clearance fit. The middle shaft ring of two-way SKF thrust ball bearing shall be fixed on the shaft to prevent rotation relative to the shaft. Generally, the installation method of SKF thrust ball bearing is mostly shaft rotation, so the fit between inner ring and shaft is win-win fit, and the fit between bearing outer ring and bearing chamber is clearance fit.
When installing SKF thrust ball bearing, check the verticality of shaft ring and shaft centerline. The method is to fix the dial indicator on the end face of the box shell, make the contact of the dial indicator push on the raceway of the bearing shaft ring, rotate the bearing and observe the pointer of the dial indicator. If the pointer swings, it indicates that the shaft ring is not perpendicular to the shaft centerline.
it can also be inspected with an extended dial indicator. When SKF thrust ball bearing is installed correctly, its seat ring can automatically adapt to the rolling of the rolling element to ensure that the rolling element is located in the raceway of the upper and lower rings. If it is installed reversely, not only the bearing does not work normally, but also the mating surfaces will be seriously worn.
Since the difference between the shaft ring and the seat ring is not obvious, extra care should be taken during assembly. In addition, a clearance of 0.2-0.5mm shall be reserved between the seat ring and the bearing seat hole of SKF thrust ball bearing to compensate for the error caused by inaccurate processing and installation of parts. When the center of bearing ring is offset during operation, this clearance can ensure its automatic adjustment, avoid contact friction and make it operate normally. Otherwise, the bearing will be severely damaged.
which is widely used. Although the installation operation of SKF thrust ball bearing is relatively simple, there are still errors in actual maintenance, that is, the installation position of the tight ring and loose ring of the bearing is incorrect, resulting in the loss of function of the bearing and rapid wear of the journal.
The inner ring of the tightening ring is in transition fit with the shaft journal. When the shaft rotates, it drives the tightening ring and rubs with the end face of the stationary part. When subjected to the axial force (FX), the friction torque will be greater than the matching resistance torque of the inner diameter, resulting in the forced rotation of the tightening ring and the shaft mating surface and aggravating the wear of the shaft journal.
(1) Distinguish the tight ring and loose ring of the bearing (according to the inner diameter of the bearing, the hole diameter difference is 0.1 ~ 0.5mm).
(2) Distinguish the stationary parts of the mechanism (i.e. parts that do not move, mainly assembly parts).
(3) In any case, the loose ring of the bearing should always rest against the end face of the stationary part.
Bearings with water as lubricant are generally sliding bearings. Babbitt alloy used in early water lubricated bearings has long been used in the field of ships, because water can provide hydrodynamic film under certain conditions. Water lubricated bearings are based on self-lubricating materials and combined with the lubricity of water under certain conditions, so as to be used in hydropower stations and other fields.
Water does not have the same high viscosity and lubricity as the recognized lubricant petroleum. Water does have limited viscosity and density, so it can provide hydrodynamic membrane. The research and development of superior water lubricated bearings will be based on materials and design, which should have good self sliding and excellent friction resistance.