Main Shaft Bearing
JTEKT Corporation (Official website) / Listed on page 2 of the document
A large-scale bearing installed on the main shaft of a wind turbine, receiving the wind load of the rotor and transmitting rotational torque to the gearbox. Available in double-row cylindrical roller, double-row tapered roller, and spherical roller bearing types.
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How to choose Rolling Bearings
Points to check when selecting, with the values for this product (Main Shaft Bearing).
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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
Offers a range of bearing types and sizes to meet the diversification of wind turbine designs and the increasing size of offshore wind turbines. Low-torque design using special surface treatment aims to reduce bearing temperature rise and extend grease life, targeting reliability to withstand more than 25 years of operation. Optimal design is carried out using FEM analysis and a bearing analysis system.
Features
- Compatible with double-row cylindrical roller bearings and double-row tapered roller bearings
- Applies posture stabilization technology to spherical roller bearings
- Special surface treatment suppresses roller slip and improves lubricity
- World's first development of insulated ceramic bearing
Applications
- Main shaft of wind power generation systems
FAQ
- Q. What bearing types are available for main shaft bearings?
- A. Double-row cylindrical roller bearings, double-row tapered roller bearings, spherical roller bearings, and others are available.
- Q. In what applications are main shaft bearings used?
- A. They are used on the main shaft of wind power generation systems, receiving the wind load of the rotor and transmitting rotational torque to the gearbox.
- Q. What effects does the special surface treatment of main shaft bearings have?
- A. It suppresses roller slip and improves lubricity. The low-torque design aims to reduce bearing temperature rise and extend grease life.
- Q. What operating life are main shaft bearings designed for?
- A. They are designed with the goal of reliability to withstand more than 25 years of operation.
- Q. What technology is applied to the spherical roller bearings in main shaft bearings?
- A. Posture stabilization technology is applied.
Written by AI based on the content of the source documents.
Source documents
- Catalog 風力発電装置用製品 Open page 2
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