**LYC Cylindrical Roller Bearing Features**
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*Created on 2018/5/16*
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LYC cylindrical roller bearings are specifically designed for applications where the inner and outer rings have ribs. These bearings can handle both radial and axial loads. The axial load capacity depends on factors such as the contact surface between the roller ends and the rib, the smoothness of the surfaces, operating temperature, and heat dissipation.
Under certain assumptions, these bearings can provide accurate and satisfactory responses to axial loads. The maximum axial load (Fmax) is calculated using the following parameters:
- **C0**: Basic static load rating (kN)
- **Fr**: Actual radial load (kN)
- **n**: Speed (r/min)
- **d(D)**: Bearing inner (outer) diameter (L)
- **K1**: Coefficient (1.5 for oil lubrication, 0.5 for grease)
- **K2**: Coefficient (1.5 for oil lubrication, 0.15 for grease)
The formula assumes a temperature difference of 60°C between the bearing and ambient, and a viscosity ratio greater than or equal to 2. Bearings not specifically designed with roller end faces and ribs should not use this formula.
To prevent rib cracking, LYC's technical department specifies that axial loads (Fa) should not exceed the following values:
- For 2 series bearings: Fa < 0.0045D^1.5 (D is the outer diameter in mm)
- For other series bearings: Fa < 0.0023D^1.7 (D is the outer diameter in mm)
For short-term or accidental axial loads, Fa should not exceed:
**Fa = 0.007D^1.7 (D is the outer diameter in mm)**
When a single-row cylindrical roller bearing is subjected to large axial loads, the rib must be uniformly loaded and achieve a certain level of rotational accuracy. The shoulder dimensions must meet specific requirements. For more details on precision and application, refer to general bearing application guidelines.
The diameter of the shoulder (for the inner ring without a rib) should be half the height of the rib. To avoid cyclic stress on the rib, the inner ring’s shoulder diameter can be calculated using the formula:
**Da = 0.5(d1 + F)**
Where:
- **Da** = Shoulder diameter
- **d1** = Inner ring rim diameter
- **F** = Inner ring raceway diameter
If the axial misalignment between the inner and outer rings exceeds 1', the load conditions on the rib may change significantly, and the safety factor from previous references may no longer apply. In such cases, it is recommended to consult LYC’s technical team.
To ensure proper operation under axial loading—especially under heavy axial loads—LYC recommends the following:
1. Keep the radial clearance within the specified range and keep it small.
2. Use a lubricant containing extreme pressure additives.
To achieve optimal performance, especially at high speeds, high acceleration, or frequent load direction changes, a minimum load must be applied. This helps prevent sliding between the rollers and raceways, which could damage the bearing.
The minimum load (Fmin) required for a single-row cylindrical roller bearing can be estimated using the formula:
- **n**: Operating speed (r/min)
- **nr**: Limit speed (0.8–0.9 times the rated speed)
- **Dm**: Mean diameter (Dm = 0.5(d + D), in mm)
- **Kr**: Minimum load factor (see table below)
| Size Series | Kr |
|-------------|----|
| 10 | 100 |
| 2, 3, 4 | 150 |
| 22 | 200 |
| 23 | 250 |
In low-temperature environments or when using high-viscosity lubricants, a higher minimum load may be necessary. Normally, the bearing’s own weight and the load it carries will exceed the minimum requirement. If not, apply the rated radial load for the bearing type to meet the minimum load requirement.
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Features of LYC Cylindrical Roller Bearings
Source: Bearing Network | Date: April 10, 2013
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