Roll Neck Bearing Four-Row Cylindrical Roller Bearing (for Backup Roll)
四列円筒ころ軸受（バックアップロール用） / JTEKT Corporation (Official website) / Listed on page 4 of the document
Four-row cylindrical roller bearing used for backup rolls of cold rolling mills. Basic static load rating up to 83300 kN.
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Specifications
| Outer diameter D | 980～1220 mm |
|---|---|
| Basic dynamic load rating Cr | 20700～29600 kN |
| Mass | 1830～2990 kg |
How to choose Rolling Bearings
Points to check when selecting, with the values for this product (Roll Neck Bearing Four-Row Cylindrical Roller Bearing (for Backup Roll)).
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1. Bore and housing bore dimensions
Select the bore diameter d to match the shaft seat, the outside diameter D to match the housing bore, and the width B to suit the installation space. Main dimensions are standardized in ISO and JIS dimension series, so interchangeable products can be found by boundary dimension designation. For tapered roller bearings, also check the assembled width T; for thrust bearings, also check the height H.
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2. Dynamic load rating based on life calculation
This product: Basic dynamic load rating Cr 20700～29600 kNThe basic dynamic load rating Cr is the reference value for calculating rated life. Verify that the required life is met using the equivalent load during operation and the rotational speed. For ball bearings, life is proportional to the cube of the load ratio, so providing load margin greatly extends life.
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3. Margin for static and shock loads
The basic static load rating C0r is the allowable standard for permanent deformation generated at the rolling elements and raceways under stationary or low-speed conditions. For applications with oscillating motion or shock loads, confirm that a static safety factor against the maximum load is secured using C0r.
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4. Operating speed and lubrication method
The limiting speed differs by lubrication method, and separate values are given for grease lubrication and oil lubrication. Confirm that the normal operating speed does not exceed the limiting value, and in high-speed ranges also consider cage material and precision grade. The reference speed can also be consulted as a thermal guideline.
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5. Precision grade and internal clearance
Precision grades (P0, P6, P5, etc.) indicate rotational accuracy and dimensional accuracy; for high-precision applications such as machine tool spindles, select higher grades. Internal clearance (C2, CN, C3, etc.) is selected to allow for changes caused by interference fit and temperature differences during operation.
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6. Materials and lubrication suited to the environment
For corrosive, high-temperature, vacuum, or clean environments, select specifications such as rings and rolling elements made of stainless steel or ceramics, or solid lubricants and fluorine grease for vacuum use. Check the operating temperature range, low dust generation, and whether food-grade grease registration applies against the application conditions.
This guide was written by AI based on the listed products' documents and specification items.
Description
Four-row cylindrical roller bearing series used for backup rolls of cold rolling mills. Bore diameters are mainly large-size products of 690 mm or more.
Features
- Compatible with large loads
Applications
- Cold rolling mills
FAQ
- Q. What is the basic load rating of the four-row cylindrical roller bearing (for backup roll)?
- A. The basic load rating is up to 83300 kN.
- Q. What applications can the four-row cylindrical roller bearing (for backup roll) be used for?
- A. It is a four-row cylindrical roller bearing used for backup rolls of cold rolling mills.
- Q. What are the ranges of outer diameter, basic dynamic load rating, and mass of the four-row cylindrical roller bearing (for backup roll)?
- A. Outer diameter D is 980 to 1220 mm, basic dynamic load rating Cr is 20700 to 29600 kN, and mass is 1830 to 2990 kg.
- Q. What is the main bore diameter range of the four-row cylindrical roller bearing (for backup roll)?
- A. The bore diameters are mainly large-size products of 690 mm or more.
Written by AI based on the content of the source documents.
Source documents
- Catalog 圧延機ロールネック用軸受 Open page 4
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