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Introduction to tapered roller bearings


Cylindrical roller bearing

The cylindrical rollers and raceways are line contact bearings. Load capacity, mainly bear radial load. The friction between the rolling element and the ring rib is small, making it suitable for high-speed rotation. Depending on whether the ring has ribs, it can be divided into single-row cylindrical roller bearings such as NU, NJ, NUP, N, and NF, and double-row cylindrical roller bearings such as NNU and NN. This bearing has a separable inner ring and outer ring.

Cylindrical roller bearings with no ribs in the inner ring or outer ring. The inner ring and outer ring can move relative to each other in the axial direction, so they can be used as free-end bearings. Cylindrical roller bearings with double ribs on one side of the inner ring and outer ring and a single rib on the other side of the ring can withstand a certain degree of axial load in one direction. Generally, steel plate stamping cages or copper alloy machined solid cages are used. However, some use polyamide molded cages.


1. The rollers and raceways are in line contact or trimmed line contact. They have large radial load-bearing capacity and are suitable for withstanding heavy loads and impact loads.

2. The friction coefficient is small, suitable for high speeds, and the limit speed is close to that of deep groove ball bearings.

3. N type and NU type can move axially, can adapt to changes in the relative position of the shaft and housing caused by thermal expansion or installation errors, and can be used as free end supports.

4. The processing requirements for the shaft or seat hole are relatively high. After the bearing is installed, the relative deflection of the outer ring axis must be strictly controlled to avoid contact stress concentration.

5. The inner or outer ring can be separated for easy installation and removal.

product features

The cylindrical rollers are in line contact with the raceway and have large radial load capacity. It is suitable for withstanding heavy loads and impact loads, as well as high-speed rotation.

The raceways and rolling elements of cylindrical roller bearings are geometrically shaped. After the improved design, it has a higher load-bearing capacity. The new structural design of the rib and roller end face not only improves the axial load-bearing capacity of the bearing, but also improves the lubrication conditions in the contact area between the roller end face and the rib, improving the Bearing performance.


1. The outer ring has no ribs N0000 type and the inner ring has no ribs NU0000 type. Cylindrical roller bearings can accept large radial loads, have high limit speeds, do not restrain the axial displacement of the shaft or housing, and cannot accept axial displacement. load.

2. NJ0000 type and NF0000 type cylindrical roller bearings with ribs on both the inner and outer rings can restrain the axial displacement of the shaft or housing in one direction and can accept small unidirectional axial loads. NU0000+HJ0000, NJ0000+HJ0000, and NUP0000 bearings can restrain the axial displacement of the shaft or shell in both directions within the axial clearance range of the imported bearings, and can accept small bidirectional axial loads.

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