High-Speed Combination Angular Contact Ball Bearings and Tapered Roller Bearings
ACT000DB / ACT000BDB / 32900JR / 32000JR / 30200JR / 32200JR / JTEKT Corporation (Official website)
Combination angular contact ball bearings for high-speed rotation and a tapered roller bearing series based on ISO metric dimension series.
Last verified: (date the content was verified against the source document)
Specifications
| Contact Angle α | 30°, 40° |
|---|
How to choose Rolling Bearings
Points to check when selecting, with the values for this product (High-Speed Combination Angular Contact Ball Bearings and Tapered Roller Bearings).
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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
Combination angular contact ball bearings are available with contact angles of 30° or 40°. Tapered roller bearings follow the ISO metric dimension series and include types with a nominal contact angle greater than 10° and up to 17°.
Features
- High-speed capability
- ISO standard metric dimension series (tapered roller bearings)
Applications
- Machine tool spindles
FAQ
- Q. Which contact angles can I select for combination angular contact ball bearings such as ACT000DB / ACT000BDB?
- A. Combination angular contact ball bearings are available with contact angles of 30° or 40°.
- Q. Which standards do tapered roller bearings such as 32900JR / 32000JR comply with?
- A. Tapered roller bearings are based on the ISO standard metric dimension series. They include types with a nominal contact angle greater than 10° and up to 17°.
- Q. What applications are high-speed combination angular contact ball bearings and tapered roller bearings suited for?
- A. These bearings are designed for high-speed rotation and are intended for use in machine tool spindles.
Written by AI based on the content of the source documents.
Source documents
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