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Single-row cylindrical roller bearings with inner rings consist of an inner ring, an outer ring, rolling elements (cylindrical rollers) and a cage. The rolling elements (rollers) between the inner and outer rings are arranged at equal intervals through the cage and can withstand radial and axial loads. Its working principle is based on the friction of the rollers rolling between the inner and outer rings and the ability to distribute loads, thereby achieving smooth rotation of the shaft. . They support the rotational load on the shaft by the rolling of cylindrical rollers between the inner and outer rings, and are widely used in various mechanical equipment, such as automobiles, ships, aircraft, rail transportation, and various fields of manufacturing.
The markings of single-row cylindrical roller bearings with inner rings (NU, N, NJ, NF, NUP, NH, RNU, HJ) usually refer to bearings of different types and structures, which have their own characteristics and uses in bearing design and application:
NU type bearings:
Structural features: NU type bearings have reinforcing ribs on both sides of the inner ring, which can withstand radial and axial loads.
Applications: Suitable for mechanical equipment that needs to withstand high radial and axial loads, such as turbomachinery, pumps, compressors, etc.
N-type bearings:
Structural features: N-type bearings have no reinforcing ribs and can only bear radial loads.
Applications: Suitable for situations where only radial loads need to be borne but no axial loads need to be borne, such as general axial motion equipment.
NJ-type bearings:
Structural features: NJ-type bearings have reinforcing ribs on one side of the inner ring, which can bear radial loads and axial loads in a certain direction.
Applications: Suitable for situations where only unidirectional axial loads need to be borne, such as machine tool spindles, automobile axles, etc.
NF-type bearings:
Structural features: NF-type bearings are similar to NJ-type bearings, but are slightly different in design and are usually used in applications that only bear axial loads.
Applications: Suitable for situations where only unidirectional axial loads need to be borne.
NUP-type bearings:
Structural features: NUP-type bearings have reinforcing ribs on both sides of the inner ring, which can bear radial loads and unidirectional axial loads.
Applications: Suitable for situations where both radial and unidirectional axial loads need to be borne, such as turbomachinery, pumps, compressors, etc.
NH-type bearings:
Structural features: NH-type bearings are an upgraded version of NUP-type bearings, providing higher load capacity and rated speed.
Application: Suitable for bearing requirements in high-load and high-speed applications.
RNU bearing:
Structural features: RNU bearing is a design without inner ring, suitable for applications that require a large gap between the outer ring of the bearing and the shaft.
Application: Usually used in situations where the bearing installation space is limited or the bearing design needs to be simplified.
HJ bearings:
Structural features: HJ accessories are accessories for single-row cylindrical roller bearings with inner rings, usually accessories used for bearing installation and adjustment.
Application: Used to fix the inner ring of the bearing or adjust the position of the bearing during installation to ensure the normal operation of the bearing and the correct installation of the shaft.
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