Imported Bearing Parameters
Source: Bearing Network | Date: February 13, 2014
Bearing parameters are essential for understanding the performance and application of imported bearings. These parameters define the structural characteristics and functional capabilities of the bearing, ensuring optimal operation under different load conditions. Key bearing parameters include: - **D (Outer Diameter)**: The outer diameter of the bearing plays a critical role in determining the overall size and load capacity. It is usually selected based on the required load and the pressure distribution across the bearing surface. - **d (Inner Diameter)**: The inner diameter corresponds to the shaft size that the bearing supports. The ratio between the outer and inner diameters (D/d) typically ranges from 1.2 to 2.5, which influences the bearing's width and overall stability. - **B (Width)**: The width of the bearing affects its load-carrying capacity and thermal performance. A common B/L ratio (width to length) is around 1, with bi-directional bearings sometimes using a ratio of 0.6. - **L (Length)**: The length of the bearing is calculated based on the number of segments or "z" and the angle of each segment (α). This parameter determines the spacing between the individual segments of the bearing. - **z (Number of Segments)**: The number of segments or "z" influences the bearing’s ability to distribute loads evenly. Typical values range from 6 to 12, though some applications may use up to 20. Too many segments can reduce load capacity but improve oil cooling. - **α (Segment Angle)**: The angle of each segment is determined by α = 360k/z, where k is the fill factor (usually between 0.7 and 0.85). This ensures even distribution of lubrication and load. - **β (Skew Height)**: β represents the difference between the maximum and minimum oil film thickness (h1 - h2). This parameter is crucial for maintaining proper lubrication and reducing wear. - **h1 and h2 (Oil Film Thickness)**: h1 is the maximum oil film thickness, while h2 is the minimum. The minimum thickness (hmin) should be sufficient to ensure full fluid lubrication. Typically, hmin is set at 0.01–0.05 mm, depending on the surface roughness (Ra). - **β/h2 Ratio**: This is a key parameter used to evaluate bearing performance. An optimal value is approximately 1.2, though it can vary between 1.2 and 2.0 for better performance. Understanding these parameters helps engineers select the right bearing for specific applications, ensuring efficiency, longevity, and reliability.
**Related Bearing Knowledge:** - Detailed Analysis of Bearing Types - Overview of Sliding Bearings - Common Issues with Self-Aligning Ball Bearings - Tips for Proper Maintenance and Protection - Important Considerations When Using NTN Bearings For more information, visit [China Bearing Network](http://www.chinabearing.net). Previous: High-performance Data of SKF Bearing Cages Next: NMB Bearing Internal Clearance Analysis
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