Automotive Bearing FAQ

— A Practical Guide from Shanghai Trans-Power

In both vehicle manufacturing and aftermarket maintenance, the importance of bearings is often underestimated. Though small in size, bearings play a critical role in supporting, guiding, and reducing friction. To help our customers better understand, select, and maintain automotive bearings, Shanghai Trans-Power has summarized the following frequently asked questions and expert answers.

1. What are the main types of automotive bearings?

Deep Groove Ball Bearings: Suitable for high-speed, light-load applications such as motors and gearboxes.
Tapered Roller Bearings: Handle both radial and axial loads, widely used in wheel hubs and differentials.
Angular Contact Ball Bearings: Designed for high-speed operations, capable of carrying significant axial forces.
Hub Bearing Units: Highly integrated, maintenance-free, and the preferred choice for modern vehicles.

2. What are common causes of bearing failure?

Poor lubrication: Insufficient or improper grease causes wear.
Improper installation: Hammering or misalignment damages the raceway.
Contamination: Dust, moisture, or chemicals accelerate corrosion.
Overloading: Prolonged high load or overspeed operation leads to premature fatigue.

3. How to determine if a bearing needs replacement?

Abnormal noise or vibration during operation.
Excessive heat indicating increased friction.
Visible damage such as spalling, pitting, or discoloration.
Excessive clearance causing vehicle vibration or uneven tire wear.

4. When should automotive bearings be inspected or replaced?

Traditional wheel bearings: Recommend inspection every 40,000–60,000 km.
Maintenance-free hub units: Typically last 100,000 km or more.

Actual intervals depend on operating conditions such as speed, load, and road environment.

5. How to extend bearing service life?

Use the correct grease and apply it properly.
Follow torque specifications during installation.
Ensure seals are intact to prevent contamination.
Regularly monitor bearing performance and address abnormalities promptly.

6. What should be considered when purchasing automotive bearings?

Match specifications to vehicle model and application.
Refer to OE part numbers or design parameters.
Choose products certified with ISO/TS16949.
For EVs, high-speed, or high-temperature conditions, use advanced materials or special process bearings.

7. Key points when replacing bearings

Use specialized tools to avoid damaging the raceway.
Keep the assembly environment clean.
Ensure proper lubrication for non-sealed bearings.
Confirm correct orientation, as some bearings (e.g., angular contact) must be mounted in pairs.

Though small in size, automotive bearings have a direct impact on vehicle safety and performance. Correct selection, proper installation, and regular maintenance significantly extend service life and reduce failures.

As a trusted global supplier, Shanghai Trans-Power provides high-quality automotive bearings and components for OEMs and the aftermarket. Whether for passenger cars, trucks, trailers, or EVs, we offer: