Comparison of National Standards for Wheel Bearings

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Wheel bearings are essential components in vehicles, and their performance is significantly influenced by the national standards they follow. This article provides a comparative analysis of domestic and foreign wheel bearings based on several key factors such as oscillation acceleration, clearance, grease filling, and sealing mechanisms. **First, Oscillation Acceleration** The oscillation acceleration values of wheel bearings were tested using S0910 (III). The results showed that the oscillation values of domestic bearings were higher than those of foreign bearings, especially in the high-frequency band. This difference is attributed to various factors such as the quality of steel balls, surface waviness, roughness, and cleanliness of the bearing. Domestic bearings tend to have more irregularities, leading to increased vibration levels. **Second, Clearance and Rotation Accuracy** Foreign bearings typically have smaller axial clearance and higher rotation accuracy compared to domestic ones. These characteristics directly affect the sealing performance of the bearing. A larger gap can result in reduced sealing efficiency, allowing contaminants to enter and reducing the lifespan of the bearing. **Third, Grease Filling Capacity** Domestic bearings generally have a 27% higher grease filling capacity than foreign bearings. However, this does not necessarily mean better performance. The exact amount of grease required depends on the internal space of the bearing, which is often difficult to calculate precisely. Foreign bearings, with larger steel balls and fewer units, may achieve better balance between grease retention and performance. **Fourth, Sealing Mechanisms** Both domestic and foreign bearings use three-lip seals, but there are significant differences in their design and layout. 1. **Contact Margin and Gap**: The contact margin between the seal lips and the slinger ring differs. Foreign bearings have lower torque sealing, meaning less friction during operation. However, the interference and touch force are greater, which can lead to improved sealing under certain conditions. 2. **Lip Layout Differences**: The direction of the third lip in foreign bearings is opposite to that of domestic bearings. This affects how pressure builds up inside the bearing. When temperature rises, internal pressure increases, potentially causing leakage if the seal is not properly designed. 3. **Seal Lip Angles**: The angle of the first seal lip in foreign bearings is steeper, resulting in a larger contact area. This helps reduce friction while improving the sealing effect. 4. **Design of the Second Lip**: The second lip of foreign bearings is thinner at the root and thicker at the end, creating a storage space between the second and third lips. This helps trap external debris. In contrast, domestic bearings lack this feature, making them more vulnerable to contamination. 5. **Resistance to External Contaminants**: Foreign bearings have better storage capabilities for mud and dust. They can trap contaminants in multiple spaces before they reach the bearing itself. Domestic bearings only have limited storage, making them less effective in harsh environments. **Conclusion** In summary, foreign bearings generally outperform domestic ones in terms of precision, sealing, and resistance to external contaminants. However, domestic bearings have a higher grease filling capacity, which can be beneficial in certain applications. Despite these differences, both types of bearings continue to evolve, driven by the need for improved performance and durability in modern vehicles. **Related Knowledge** - Tips for Extending the Life of Rolling Bearings - Analysis of NTN Bearing Front-Loading Assistance Code - Understanding High Temperatures in IKO Bearings For more information, visit the China Bearing Network. This article is linked from http://... Please cite the source: http://... Previous: Analysis of the Sliding (Smooth) Bearing of the Initiator (1) Next: Detailed Analysis of the Characteristics of "Rolling Bearings"

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