The fit between 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 bearing shall be fixed on the shaft to prevent rotation relative to the shaft. Generally, Novice the installation method of 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 the bearing, check the verticality of the shaft ring and the 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.
When the shell hole is deep, it can also be inspected with an extended dial indicator. When the bearing is installed correctly, Novice 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 Novice shall be reserved between the bearing race and the bearing seat hole to compensate for the error caused by inaccurate processing and installation of parts.
When the center of the bearing ring is offset during operation, Novice this clearance can ensure its automatic adjustment, avoid contact friction and make it run normally. Otherwise, the bearing will be severely damaged.
Lubrication has a very important impact on the operation and service life of bearings. Novice Here we briefly introduce the general principles of selecting lubricating grease. Lubricating grease is made of base oil, thickener and additives. The performance of different types and different brands of lubricating grease of the same type varies greatly, and the allowable rotation limit is different. Pay attention to it when selecting.
The performance of grease is mainly determined by the base oil. Generally, the base oil with low viscosity is Novice suitable for low temperature and high speed, and the base oil with high viscosity is suitable for high temperature and high load. The water resistance of thickener determines the water resistance of grease. In principle, greases of different brands cannot be mixed, and even greases with the same thickener will have bad effects on each other due to different additives.
The bearing surface is coated with antirust oil. You must carefully clean it with clean gasoline or kerosene, and then apply clean, Novice high-quality or high-speed and high-temperature lubricating grease before installation and use. Cleanliness has a great influence on the service life and vibration noise of rolling bearing. However, we would like to remind you that the fully enclosed bearing does not need cleaning and refueling.
During installation, do not directly hammer the bearing end face and non stressed surface. Novice Use pressure block, sleeve or other installation tools (Tooling) to make the bearing bear uniform force. Do not drive the installation through the rolling element. If the mounting surface is coated with lubricating oil, the installation will be smoother.
If the fit interference is large, the bearing shall be installed as soon as possible after being heated to 80 ~ 90 ℃ in mineral oil, and the oil temperature shall be strictly controlled not to exceed 100 ℃ to prevent tempering effect, Novice hardness reduction and size recovery. In case of difficulty in disassembly, it is recommended that you use the disassembly tool to pull outward and carefully pour hot oil on the inner ring. The heat will expand the inner ring of rolling bearing and make it easier to fall off.
yes. If there are iron filings, Novice burrs, dust and other foreign matters in the bearing, the bearing will produce noise and vibration during operation, and even damage the raceway and rolling element. Therefore, before installing the bearing, you must ensure that the installation surface and installation environment are clean.
When lubricating bearings, Novice the more grease the better, which is a common misconception. Excessive grease in the bearing and bearing chamber will cause excessive mixing of grease, resulting in extremely high temperature. The amount of lubricant filled in the rolling bearing should be 1 / 2 ~ 1 / 3 of the internal space of the bearing, and should be reduced to 1 / 3 at high speed.