**A Comparative Analysis of the Sealing Layout of Wheel Bearings in China**
Home > Bearing Knowledge > Comparative Analysis of the Sealing Layout of Wheel Bearings in China
Source: China Bearing Network | Time: February 10, 2014
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Analytical methods play a crucial role in helping companies improve their technical skills and product quality. By comparing similar samples from different countries, companies can gather valuable information about foreign products' design, performance, and sealing techniques. This analysis helps identify strengths and weaknesses, allowing domestic manufacturers to enhance their own designs and close the gap with international standards.
One key area of comparison is the oscillation acceleration values of wheel bearings. When testing the S0910 (III) model, it was found that domestic bearings have higher oscillation values compared to foreign ones, especially in high-frequency bands. This difference is closely related to factors such as raceway waviness, surface roughness, steel ball quality, and bearing cleanliness.
Another important factor is the axial clearance and rotational accuracy. Foreign bearings typically have much smaller axial clearances and higher rotational accuracy than domestic models. These characteristics significantly impact sealing performance—larger gaps and lower accuracy result in weaker seals.
In terms of grease filling capacity, domestic bearings hold 27% more grease than foreign ones. However, this does not necessarily mean better performance. The lack of precise calculation for internal space and grease filling rate leads to potential issues like excessive pressure buildup and reduced sealing efficiency.
The sealing layout is another critical area where domestic and foreign bearings differ. Both use three-lip seals, but their design and arrangement vary significantly:
1. **Contact Margin and Gap Differences**: The contact between the seal lips and the slinger ring differs. Foreign bearings feature a low-torque seal with controlled interference, while domestic models tend to have higher conflicting torque.
2. **Seal Lip Layout**: The direction of the third lip is opposite in domestic and foreign bearings. In foreign designs, the third lip creates a storage space that helps manage pressure changes during operation, reducing the risk of leakage.
3. **Angle of Seal Lip**: The angle of the first seal lip in foreign bearings is larger, leading to a broader contact area and better sealing performance without increasing friction.
4. **Second Lip Design**: The second lip in foreign bearings is thinner at the root and slopes upward, creating a space that stores external contaminants. Domestic bearings lack this feature, making them less effective against dust and moisture.
5. **Resistance to External Contaminants**: Foreign bearings are designed with multiple storage areas to trap dirt and dust before they reach the bearing itself. Domestic models only have limited storage capabilities, making them more vulnerable to contamination.
In conclusion, while domestic bearings may have higher grease filling capacities, foreign bearings demonstrate superior sealing performance due to optimized design and layout. They offer better resistance to external elements, lower torque, and improved sealing efficiency. However, excessive grease can lead to pressure build-up and reduced sealing effectiveness.
By learning from these differences, Chinese manufacturers can refine their designs and improve overall performance, ultimately strengthening their position in the global market.
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**Related Bearing Knowledge**
- Types of Bearings, Torque, Load, and Seals
- The "Five Major Factors" Affecting SKF Bearing Life
- INA Bearing Grease Knowledge
This article is sourced from [China Bearing Network](http://www.chinabearing.net).
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