Steel Leveler Backup Roll Bearing Unit
NTN Corporation (Official website) / Listed on page 65 of the document
Bearing unit for backup rolls in leveling of sheet material. Available in long type and narrow width type.
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Specifications
| Rotational torque reduction rate (ultra-low torque product) | 40 % |
|---|
How to choose Rolling Bearings
Points to check when selecting, with the values for this product (Steel Leveler Backup Roll Bearing Unit).
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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
The 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
The long type is an assembled structure of roll, shaft and bearings, incorporating a cage-equipped needle roller bearing and a deep groove ball bearing. The dry-specification ultra-low torque type reduces rotational torque by 40% compared with conventional products. The narrow width type features high rigidity from thick outer ring walls and high load capacity from double-row cylindrical rollers.
Features
- Long type incorporates a cage-equipped needle roller bearing and a deep groove ball bearing
- Dry-specification ultra-low torque type reduces rotational torque by 40%
- Narrow width type offers high rigidity from thick outer ring walls
- Narrow width type offers high load capacity from double-row cylindrical rollers
Applications
- Leveling of steel sheet material
- Tension leveler
FAQ
- Q. What bearings are built into the long type of the Steel Leveler Backup Roll Bearing Unit?
- A. The long type is an assembled structure of roll, shaft and bearings, incorporating a cage-equipped needle roller bearing and a deep groove ball bearing.
- Q. How much does the dry-specification ultra-low torque type of the Steel Leveler Backup Roll Bearing Unit reduce rotational torque?
- A. The dry-specification ultra-low torque type reduces rotational torque by 40% compared with conventional products. The rotational torque reduction rate is 40 %.
- Q. What are the features of the narrow width type of the Steel Leveler Backup Roll Bearing Unit?
- A. The narrow width type features high rigidity from thick outer ring walls and high load capacity from double-row cylindrical rollers.
- Q. What applications is the Steel Leveler Backup Roll Bearing Unit used for?
- A. It is used for leveling steel sheet material and in tension levelers. It is a bearing unit for backup rolls used in leveling sheet material.
Written by AI based on the content of the source documents.
Source documents
- Catalog ニードルローラベアリング ハンドブック 80 pages Open page 65
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