Double Row Cylindrical Roller Bearings Double row cylindrical roller bearings have two structures: cylindrical bore and conical bore. 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 machine tool spindles. The conical inner hole can also play the role of micro-adjustment of the clearance, and can simplify the structure of the positioning device and facilitate installation and disassembly. Structure and characteristics Commonly used lyc double row cylindrical roller bearings have the following forms: The structural feature of the nn type bearing is that the inner ring has double ribs and the outer ring has no ribs. The nnu type bearing has double ribs on the outer ring and the inner ring These two types of bearings without ribs do not limit the relative axial displacement between the shaft and the shell, and are suitable for non-locating bearings. The cages of this type of bearings are mostly car-made solid cages. The nnf type bearing is a double row full complement cylindrical roller bearing, which can bear overturning moment in addition to a large radial load and axial load, so it is often used as a fixed bearing. The nnf type bearing is a construction type with two inner rings with double rib and one outer ring with middle rib. The rollers are guided by the ribs of the double inner ring, which are held together by a clamping ring. Contact seals are used on both sides of the nnf bearing. The bearing is filled with grease. When selecting a single-row cylindrical roller bearing with ribs on the inner and outer rings, the axial load capacity should be calculated, and its value is related to the radial load and the lubrication method. The working temperature of the grease is -50°C to +110°C, but due to the limitation of the oil seal material, the working temperature of the bearing is limited to between -40°C and +80°C. In the case of good working conditions, the nnf bearing with oil seal does not need maintenance. If the bearing is in a water vapor or polluted environment for a long time, and it is running at medium and high speed, the lubricating oil groove and lubricating oil hole on the outer ring can be used for the bearing. Relubricate. Application Mainly used for machine tool spindle, metallurgical equipment, heavy machinery, lifting equipment, etc. This article is edited by Xiao Gong
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