Comparative Analysis of the National Standards of Wheel Bearings

---

Wheel bearings are essential components in vehicle systems, and their performance is influenced by various factors such as design, material quality, and manufacturing standards. This article presents a comparative analysis of domestic and foreign wheel bearings based on several key criteria. **First, Oscillation Acceleration Value** The oscillation acceleration value of the wheel bearing is tested using S0910 (III). The results show that the oscillation values of domestic bearings are higher than those of foreign bearings, especially in the high-frequency band. This difference can be attributed to factors like the uniformity of the raceway, surface roughness, steel ball quality, and cleanliness of the bearing. **Second, Bearing Clearance and Rotation Accuracy** Foreign bearings typically have a much smaller axial clearance and significantly higher rotation accuracy compared to domestic ones. These factors directly impact sealing performance—larger clearances result in lower precision and worse sealing efficiency. **Third, Grease Filling Capacity** Domestic bearings generally have a grease filling capacity that is 27% higher than that of foreign bearings. However, this does not necessarily mean better performance, as the internal space calculation is not precise, and the filling rate is not well-controlled. Foreign bearings, with larger steel balls and fewer units, tend to offer more efficient grease distribution. **Fourth, Seal Design and Performance** Both domestic and foreign bearings use a three-lip seal, but there are significant differences in their layout and functionality: 1. **Seal Lip Contact and Gap**: The contact margin between the sealing lips and the slinger ring differs. Foreign bearings have a low-torque seal with less interference, while domestic bearings have a higher contact force. 2. **Lip Layout Differences**: The direction of the third lip in foreign bearings is opposite to that of domestic ones. This affects how pressure is managed inside the bearing during rotation and temperature changes. 3. **Seal Lip Angle and Contact Area**: The angle of the first lip in foreign bearings is steeper, resulting in a larger contact area and improved sealing effect without increasing friction. 4. **Second Lip Design**: The second lip in foreign bearings is thinner at the root and has an upward slope, creating a storage space for contaminants. Domestic bearings lack this feature, reducing their ability to resist external dirt and dust. 5. **Dust and Mud Resistance**: Foreign bearings have multiple storage areas (spaces 1, 2, and 3) that trap external particles before they reach the bearing interior. Domestic bearings only have limited storage in spaces 1 and 3, making them less effective in harsh environments. **Conclusion** In summary, while domestic bearings may have certain advantages in terms of grease filling, foreign bearings excel in precision, sealing performance, and resistance to external contaminants. The design of the three-lip seal plays a crucial role in determining the overall performance and longevity of the bearing. Understanding these differences helps manufacturers and users make informed decisions about bearing selection and maintenance.

---

Recommended for friends: - Tips to Extend the Life of Rolling Bearings - Analysis of NTN Bearing Front-Loading Assistance Code - IKO Bearing Temperature Too High: Causes and Solutions This article is linked from http:// Please cite the China Bearing Network: http:// Previous: Analysis of the Sliding (Smooth) Bearing of the Initiator (1) Next: Detailed Analysis of the Characteristics of "Rolling Bearings"

Pump Accessories

Pump Accessories,Water Pump Accessories,Water Pump Fittings,Pump Fittings

Zhengzhou Shenlong Pump Industry CO.,Ltd , https://www.waterpump-manufacturer.com