Cylindrical Roller Bearing
円筒ころ軸受 (NU・NJ・NUP・N・NN形等) / JTEKT Corporation (Official website) / Listed on page 9 of the document
A roller bearing in which cylindrical rollers contact the raceways along a line, offering high radial load capacity suitable for heavy and shock loads. Inner and outer rings are separable, allowing easy mounting and dismounting.
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How to choose Rolling Bearings
Points to check when selecting, with the values for this product (Cylindrical Roller Bearing).
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1. Main dimensions matching shaft diameter and housing
The bore diameter d is determined by the shaft diameter, while the outside diameter D and width B are determined by the housing bore diameter and mounting space. Main dimensions are standardized under JIS/ISO series, which makes replacement with interchangeable products easier. For tapered roller bearings, also check the assembled width T and outer ring width C; for thrust bearings, also check the height H.
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2. Check dynamic load rating against required life
The basic dynamic load rating Cr is the reference value for calculating rolling fatigue life during rotation. Calculate the rated life from the actual applied load and rotational speed, and confirm that the required life is met. Roller bearings have a larger Cr than ball bearings of the same dimensions and are suited to heavy loads.
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3. Check static load rating for stationary or shock loads
In applications involving low-speed rotation, oscillation, or shock loads while stopped, permanent deformation (indentations) may remain on the raceway surfaces. Therefore, check the safety factor using the ratio of the basic static load rating C0r to the maximum load.
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4. Combination of rotational speed and lubrication method
The limiting speed differs between grease lubrication and oil lubrication. Confirm that the operating speed has sufficient margin using the value for the lubrication method adopted. At higher speeds, the cage material, guide method, and accuracy grade also affect rotational performance.
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5. Handling load direction and shaft misalignment
If axial loads (loads in the shaft direction) are also applied, check the contact angle of angular contact ball bearings or tapered roller bearings. The larger the contact angle, the greater the capacity to accept axial loads. If the shaft deflects or there are mounting errors, check the permissible misalignment angle of self-aligning types.
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6. Materials for high-temperature, vacuum, and corrosive environments
In high-temperature, vacuum, or chemical-exposed environments, common combinations of steel and grease may not be usable. Therefore, confirm the operating temperature range and atmospheric pressure, then select the rolling element material and cage material accordingly. Options include ceramics, stainless steel, solid lubricants, and fluorine grease.
This guide was written by AI based on the listed products' documents and specification items.
Description
NU and N types permit axial movement and are suitable for free-side bearings. NN and NNU types offer high rigidity and are widely used in machine tool spindles. Available in various configurations including single row, double row, and four row.
Features
- High radial load capacity
- Separable inner and outer rings
- Suitable for high-speed rotation
Applications
- Medium and large electric motors
- Generators
- Internal combustion engines
- Gas turbines
- Machine tool spindles
- Reduction gears
- Material handling machinery
FAQ
- Q. What load conditions are cylindrical roller bearings (NU, NJ, NUP, N, NN types, etc.) suitable for?
- A. They are roller bearings in which cylindrical rollers contact the raceways along a line, offering high radial load capacity suitable for heavy and shock loads.
- Q. How should NU and N types be differentiated from NN and NNU types in cylindrical roller bearings?
- A. NU and N types permit axial movement and are suitable for free-side bearings. NN and NNU types offer high rigidity and are widely used in machine tool spindles.
- Q. Are cylindrical roller bearings easy to mount and dismount?
- A. Yes. Because the inner and outer rings can be separated, mounting and dismounting are easy.
- Q. Can cylindrical roller bearings operate at high rotational speeds?
- A. Yes, they are suitable for high-speed rotation.
- Q. What configurations are available for cylindrical roller bearings?
- A. They are available in various configurations including single row, double row, and four row.
Written by AI based on the content of the source documents.
Source documents
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Catalog
転がり軸受 総合カタログ
Open page 9
Found on: https://koyo.jtekt.co.jp/products/exsev/
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