Single row cylindrical roller bearing

Cylindrical roller bearings have line contact between the rollers and raceways. They have a high load capacity and primarily bear radial loads. Friction between the rolling elements and the raceway flanges is low, making them suitable for high-speed rotation. Depending on whether the raceways have flanges, they can be classified as single-row cylindrical roller bearings (NU, NJ, NUP, N, NF, etc.) and double-row cylindrical roller bearings (NNU, NN, etc.). This type of bearing has a separable inner and outer ring.

Cylindrical roller bearings with no flanges on either the inner or outer ring allow axial relative movement between the inner and outer rings, making them usable as free-end bearings. Cylindrical roller bearings with double flanges on one side of the inner and outer rings and a single flange on the other side can withstand a certain degree of axial load in one direction. They generally use stamped steel cages or machined solid copper alloy cages. However, some also use molded polyamide cages.

Features:

1. The rollers and raceways have line contact or modified line contact, resulting in a high radial load capacity, suitable for heavy and impact loads.

2. Low coefficient of friction, suitable for high speeds, with a limiting speed close to that of deep groove ball bearings.

3. N-type and NU-type bearings allow axial movement, accommodating changes in the relative position of the shaft and housing due to thermal expansion or installation errors, and can be used as free-end supports.

4. Requires high precision in shaft or housing machining; the relative misalignment of the outer ring axis after bearing installation must be strictly controlled to prevent stress concentration.

5. The inner or outer ring can be separable for easy installation and disassembly.

Product Features: Cylindrical rollers make line contact with the raceway, resulting in high radial load capacity. Suitable for heavy and impact loads, as well as high-speed rotation.

The raceway and rolling elements of cylindrical roller bearings have a specific geometric shape. Improved design results in higher load-bearing capacity. The novel structural design of the flanges and roller end faces not only enhances the axial load capacity but also improves lubrication conditions in the contact area between the roller end faces and flanges, thus improving bearing performance.

Single Row Bearings

N and NU Types: N-type bearings have no flanges on the outer ring, but flanges on both sides of the inner ring. This allows for axial displacement between the shaft and the bearing housing in both directions. NU-type bearings have flanges on both sides of the outer ring, but no flanges on the inner ring. This also allows for axial displacement between the shaft and the bearing housing in both directions. Therefore, this type of structure is suitable for use as a floating end bearing.

NJ and NF Types: NJ-type bearings have flanges on both sides of the outer ring and a flange on one side of the inner ring. This can withstand a certain amount of unidirectional axial load. NF-type bearings have a flange on one side of the outer ring and flanges on both sides of the inner ring. This can also withstand a certain amount of unidirectional axial load. Therefore, this type of structure is suitable for use as a unidirectional axial positioning bearing.

NUP and NFP Types: NUP-type bearings have flanges on both sides of the outer ring, a (fixed) single flange on one side of the inner ring, and a separable flat retainer ring on the other side. This can withstand a certain amount of bidirectional axial load.

The NFP type bearing has a fixed single retaining ring on one side of the outer ring, while the other side is a separable flat retaining ring. The inner ring has retaining rings on both sides. It can also withstand a certain amount of bidirectional axial load. This type of bearing can restrict the axial displacement of the shaft relative to the bearing housing in both directions. Therefore, it is suitable for use as a fixed-end bearing.

NH (NJ+HJ) Type

The NH type bearing is a combination of the NJ type bearing and the HJ type slanted retaining ring. Because the inner ring of the NUP type bearing is relatively short, and the flat retaining ring is not fixed, it is inconvenient to use. The NH type bearing can utilize the entire width of the inner ring of the NJ type bearing to maintain a tighter fit with the shaft. Furthermore, the NH type bearing is easier to install and remove.

The NH type bearing can restrict the axial displacement of the shaft relative to the bearing housing in both directions. Therefore, it is suitable for use as a fixed-end bearing.