Bearing Friction Coefficient
Source: China Bearing Network | Date: September 20, 2013
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When comparing rolling bearings with sliding bearings, the friction torque of rolling bearings can be calculated based on the bearing's inner diameter using the following formula:
**M = u × P × d / 2**
Where:
- **M** is the friction torque in millinewton-meters (mN·m)
- **u** is the friction coefficient (refer to Table 1)
- **P** is the bearing load in newtons (N)
- **d** is the nominal inner diameter of the bearing in millimeters (mm)
The friction coefficient **u** is significantly influenced by factors such as bearing type, load, speed, and lubrication method. The typical values for a stable rotation under normal conditions are listed in Table 1.
For plain bearings, the friction coefficient usually ranges from **0.01 to 0.02**, though in some cases it may go up to **0.1 to 0.2**.
Here is a table showing the friction coefficients for different types of bearings:
| Bearing Type | Friction Coefficient (u) |
|---------------------------|--------------------------|
| Deep Groove Ball Bearings | 0.0010–0.0015 |
| Angular Contact Ball Bearings | 0.0012–0.0020 |
| Self-Aligning Ball Bearings | 0.0008–0.0012 |
| Cylindrical Roller Bearings | 0.0008–0.0012 |
| Full Complement Needle Bearings | 0.0025–0.0035 |
| Needle Bearings with Cage | 0.0020–0.0030 |
| Tapered Roller Bearings | 0.0017–0.0025 |
| Spherical Roller Bearings | 0.0020–0.0025 |
| Thrust Ball Bearings | 0.0010–0.0015 |
| Thrust Spherical Roller Bearings | 0.0020–0.0025 |
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