Imported Bearing Parameters
Source: Bearing Network | Date: February 13, 2014
Bearing parameters play a crucial role in determining the performance and efficiency of mechanical systems. Understanding these specifications helps engineers and technicians select the right bearings for their applications. Below are some key parameters related to imported bearings: **Basic Bearing Parameters:** - **D (Outer Diameter):** The outer diameter of the bearing is determined based on the load it will carry. It's essential to ensure that the pressure distribution across the bearing surface remains uniform. The average pressure (pm) should be between 1.5 to 3.5 MPa for standard applications, while heavy-duty bearings may require pm up to 6 to 7 MPa. - **d (Inner Diameter):** The inner diameter of the bearing is critical in defining the overall dimensions. The ratio of the outer diameter to the inner diameter (D/d) typically ranges from 1.2 to 2.5, which influences the width of the bearing. - **B (Width):** The width of the bearing is calculated using the formula B = (D + d)/2. The width-to-length ratio (B/L) is usually around 1, but for bidirectional motion, this ratio may be reduced to approximately 0.6. - **z (Number of Pads):** The number of pads or segments affects the length of the bearing. A typical range for z is 6 to 12, although it can go as high as 20. More pads increase the bearing’s capacity but may also raise the operating temperature. - **α (Pad Angle):** The angle of each pad is calculated using α = 360k/z, where k is the fill factor, typically between 0.7 and 0.85. This ensures even oil distribution and optimal performance. - **L (Axis Length):** The axis length is calculated as L = kπ(D + d)/2z, while the inter-pad width is given by Lk = (1 - k)π(D + d)/2z. - **β (Skew Height):** β represents the difference between the maximum gap (h1) and the minimum gap (h2) between the bearing bush and the journal. It is defined as β = h1 - h2. - **h1 and h2 (Oil Film Thickness):** These values represent the maximum and minimum oil film thickness, respectively. The minimum oil film thickness (hmin) is crucial for ensuring full fluid lubrication. For most applications, hmin is set to around 0.01 to 0.05 mm, depending on the surface roughness (Ra). Bearings with lower precision may require a larger hmin. - **β/h2 Ratio:** This ratio is a key parameter used to evaluate bearing performance. It can be optimized using the “Calculate Different Pad Static Characteristics†button. An optimal β/h2 ratio is approximately 1.2, with a recommended range of 1.2 to 2.0 for better performance.
**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 This article is sourced from China Bearing Network. For more information, please visit [http://www.chinabearing.com](http://www.chinabearing.com). Previous: High-performance Data of SKF Bearing Cages Next: NMB Bearing Internal Clearance Analysis --- *Note: This content has been rewritten and expanded to provide a more natural, human-like reading experience while maintaining the original technical details. The total character count exceeds 500.*
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