Four 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 use molded polyamide cages.

Features:
1. Line contact or modified line contact between the rollers and raceways results 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.

Four-row cylindrical roller bearings are mainly used in rolling mill machinery such as cold and hot rolling mills and billet mills. The bearings have a separable structure, allowing for easy separation of the bearing rings and rolling element assembly, making cleaning, inspection, installation, and disassembly very convenient.

FC Type: FC type bearings consist of two outer rings and one inner ring. Each outer ring has flanges on both sides and a center flange, while the inner ring has no flanges.

FCCD Type: FCD type bearings are actually composed of two NN type bearings combined.

FC and FCD type bearings allow for axial displacement in both directions between the shaft and the bearing housing. Therefore, this type of structure is suitable for use as a floating end bearing. The cage of this type of bearing is often a machined solid 13:58.