Publish Time: 2022-08-15 Origin: Site
cylindrical roller bearings are separable bearings, which are very convenient to install and disassemble. cylindrical roller bearings can withstand large radial loads and are suitable for use in high-speed operation.
What is a double row cylindrical roller bearing?
What are the common double row cylindrical roller bearings on the market?
How to use NNF cylindrical roller bearings correctly?
Double row cylindrical roller bearings have two structures: cylindrical inner hole and conical inner hole (bearing rear code plus K). This type of bearing has the advantages of compact structure, high rigidity, large bearing capacity, and small deformation after being loaded, and is especially suitable for the support of machine tool spindles. The conical inner hole can also play the role of micro-adjustment of clearance, and can simplify the structure of the positioning device and facilitate installation and disassembly
NN, NNU type
The outer ring of the NN type cylindrical roller bearing has no ribs, and there are ribs on both sides of the inner ring and a middle rib in the middle. Displacement in two directions in the axial direction between the shaft and the bearing housing can be allowed.
The outer ring of the NNU type cylindrical roller bearing has ribs on both sides and a middle rib in the middle, and the inner ring has no ribs. Displacement in two directions in the axial direction between the shaft and the bearing housing can be allowed. Therefore, this type of structure is suitable for the moving end bearing. The cages of this type of bearings are mostly car-made solid cages.
NNF type cylindrical roller bearing is a double row full complement cylindrical roller bearing. The bearing consists of one outer ring with middle rib and two inner rings with double rib. The rollers are guided by the ribs of the inner ring, and the two inner rings are held together by a clamping ring. In addition to the large radial load and axial load, the structure can also bear the overturning moment, so it is often used as a fixed end bearing.
Contact seals are used on both sides of NNF cylindrical roller bearings. The bearing is filled with grease, and the working temperature of the grease is -50°C to +110°C, but due to the limitation of the sealing material, the working temperature of the bearing is limited to -40°C to +80°C. In the case of good working conditions, the sealed NNF bearing does not need maintenance. If the bearing is in water vapor or polluted environment for a long time, and it is running at medium and high speed, it can be adjusted through the lubricating oil groove and lubricating oil hole on the outer ring. Bearings are relubricated.
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