Cylindrical roller bearings are rolling bearings composed of a disc-shaped roller and a cylinder, which are mainly used to bear radial loads, but can also bear axial loads and torsional loads. The rollers of cylindrical roller bearings are arranged in parallel, and there is a spacer between the rollers, which can effectively avoid the inclination of the rollers or the friction between the rollers, and reduce the increase of rotating torque. Among them, the double row cylindrical roller bearing has two structures: cylindrical inner hole and conical inner hole (bearing post code plus). This kind of bearing has the advantages of compact structure, large rigidity, large bearing capacity, small deformation after load, etc., especially suitable for machine tool support. The conical inner hole can also play a role in micro-adjusting the clearance, and can simplify the structure of the positioning device, convenient installation and disassembly.
The NN type bearing has no guard on the outer ring, and the inner ring has a guard on both sides and a middle guard in the middle. It is possible to allow displacement in two directions in the axial direction between the shaft and the bearing seat.
The two sides of the outer group of NNU bearing have a guard edge in the middle, and the inner ring has no guard edge. It is possible to allow displacement in two directions in the axial direction between the shaft and the bearing seat.
Advantage
1, with excellent radial load characteristics, strong bearing capacity, suitable for bearing heavy loads.
2, can withstand large axial impact load, and can be kept parallel with the shaft.
3, with excellent radial rigidity, and shaft contact will not produce excessive displacement.
4, at high temperature can also withstand a certain axial load, and has self-lubricating ability.
5, the friction coefficient is small, suitable for high-speed rotation, the limit speed is close to the deep groove ball bearing.
6, cylindrical roller bearings are separated bearings, inner or outer rings can be separated, easy to install and disassemble.
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