BB-LFT Low-Torque Ball Bearing (Differential Pinion Use, Single-Row and Double-Row, Low-Torque Deep Groove Ball Bearing with High Axial Load Capability)
LFT-Series / JTEKT Corporation (Official website) / Listed on page 3 of the document
A low-torque ball bearing applying the oil flow control structure of ultra-low-torque tapered roller bearings. Used in applications such as differential pinions.
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Specifications
| Churning loss reduction rate (compared to angular contact ball bearings) | 30 % |
|---|---|
| Foreign Matter Oil Durability | 1.5 倍 |
| Outer diameter reduction rate (compared to standard deep groove ball bearing) | 10 % |
How to choose Rolling Bearings
Points to check when selecting, with the values for this product (BB-LFT Low-Torque Ball Bearing (Differential Pinion Use, Single-Row and Double-Row, Low-Torque Deep Groove Ball Bearing with High Axial Load Capability)).
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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
By optimizing the cage and inner/outer ring shapes and restricting the inflow of oil, churning loss is reduced by up to 30% compared with angular contact ball bearings. Durability in oil containing foreign matter is 1.5 times higher. The high axial load capability type has an outer diameter 10% smaller than standard deep groove ball bearings, and reduces drag torque by up to 50% compared with tapered roller bearings of equivalent allowable load.
Features
- Churning loss reduced by up to 30% compared with angular contact ball bearings
- Durability in oil containing foreign matter 1.5 times higher
- Outer diameter 10% smaller than standard deep groove ball bearings (high axial load capability type)
- Drag torque reduced by up to 50% compared with tapered roller bearings (high axial load capability type)
- Vehicle fuel efficiency improved by 1%
Applications
- Pinion support in differential units
- Automobiles
FAQ
- Q. In what applications can the BB-LFT Low-Torque Ball Bearing (LFT-Series) be used?
- A. It is used in automotive applications such as pinion support in differential units.
- Q. What low-torque effect does the BB-LFT Low-Torque Ball Bearing have compared with angular contact ball bearings?
- A. By optimizing the cage and inner/outer ring shapes and restricting the inflow of oil, it reduces churning loss by up to 30% compared with angular contact ball bearings.
- Q. What are the outer diameter and drag torque characteristics of the high axial load capability type of the BB-LFT Low-Torque Ball Bearing?
- A. Its outer diameter is 10% smaller than standard deep groove ball bearings. Compared with tapered roller bearings of equivalent allowable load, it reduces drag torque by up to 50%.
- Q. How much does the BB-LFT Low-Torque Ball Bearing perform in oil containing foreign matter?
- A. Durability in oil containing foreign matter is 1.5 times higher.
- Q. How much does adopting the BB-LFT Low-Torque Ball Bearing affect vehicle fuel efficiency?
- A. Vehicle fuel efficiency is improved by 1%.
Written by AI based on the content of the source documents.
Source documents
- Catalog LFT-Series 低トルク軸受 Open page 3
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