- Importance of Automobile Bearings
Automobile bearings are core components of vehicle transmission, steering and driving systems. Their main functions are to reduce friction, support rotating parts and bear loads. Common automobile bearings include:
Wheel hub bearings (support wheels)
Gearbox bearings (transmit power)
Clutch release bearings (control clutch engagement)
Engine bearings (crankshaft, camshaft support)
Steering system bearings (power steering, universal joints)
Once the bearing is damaged, it may cause abnormal noise, tremendo, steering difficulties and even driving safety hazards, so correct maintenance is essential.
- Common faults and causes of automobile bearings
- Ruído anormal (zumbido, metal friction sound)
Causes: insufficient lubrication, bearing wear or ball/raceway damage.
Typical manifestations:
Wheel hub bearing damage → The higher the speed, the greater the noise, and the change is obvious when turning.
Gearbox bearing damage → Metal friction sound when shifting.
- Abnormal vibration
Causes: Excessive bearing clearance, improper installation or component deformation.
Impact: Steering wheel shaking, body resonance, affecting handling stability.
- Overheating
Reason: poor lubrication, overload operation or seal failure.
Danger: high temperature may cause bearings to get stuck, such as overheating of wheel hub bearings may cause wheel locking.
- Vazamento de óleo (grease leakage)
Reason: oil seal aging, external damage or overload leading to seal failure.
III. Daily maintenance methods for automobile bearings
- Inspeção regular
Wheel hub bearings: lift the vehicle, shake the tires by hand, and check for looseness or abnormal noise.
Drive shaft bearings: Check whether the universal joint is leaking oil or has abnormal vibration.
Rolamento de liberação da embreagem: step on the clutch pedal and listen for “chiando” ruído anormal.
- Correct lubrication
Grease selection: use high temperature and high load special grease (such as lithium grease, molybdenum disulfide grease).
Lubrication cycle:
Non-sealed bearings: add grease every 20,000-30,000 kilometers or every year.
Sealed bearings (such as hub unit bearings): generally maintenance-free, but the sealing needs to be checked regularly.
- Avoid overloading and impact
Overloading: will increase the bearing load and accelerate wear.
Bad road conditions: When driving on bumpy roads, the bearings are subjected to greater impact and the inspection cycle needs to be shortened.
- Waterproof and dustproof
After wading: check the bearing sealing to avoid mud and sand from entering.
High-pressure water gun cleaning: avoid direct impact on the bearing parts to prevent water from seeping in.
- Correct installation
Use special tools: avoid knocking during installation to prevent bearing deformation.
Conformidade de torque: Por exemplo, o rolamento do cubo da roda precisa ser apertado de acordo com o torque especificado pelo fabricante. Muito solto ou muito apertado afetará a vida.
- Recomendações de substituição para diferentes rolamentos
Tipo de rolamento Quilometragem de substituição comum Sinal de substituição
Rolamento do cubo da roda 80,000-150,000 km Ruído anormal da roda, vibração de condução
Rolamento da caixa de engrenagens 100,000-200,000 km Mudanças difíceis, ruído metálico
Rolamento de liberação da embreagem 100,000-150,000 km Ruído anormal da embreagem, pedal mais pesado
Rolamento do sistema de direção 60,000-120,000 km Estagnação da direção, ruído anormal - Hábitos de direção para prolongar a vida útil do rolamento
Condução suave: evite aceleração e frenagem repentinas para reduzir a carga de impacto do rolamento.
Reduza curvas grandes em baixa velocidade: como virar no lugar aumentará a pressão do rolamento de direção.
Substitua as peças desgastadas a tempo: como desgaste irregular dos pneus e envelhecimento da suspensão afetarão indiretamente a vida útil do rolamento.
Alinhamento regular das quatro rodas: prevent abnormal tire wear from causing uneven bearing force.
- Common misunderstandings about bearing maintenance
❌Misunderstanding 1: Sealed bearings do not require maintenance
✅Fact: Although sealed bearings are designed to be maintenance-free, extreme working conditions (such as wading and off-roading) still need to be checked.
❌ Myth 2: If the noise is not serious, you can continue to use it
✅ Fact: Bearing damage may lead to the scrapping of parts such as hubs and axles, which need to be dealt with in time.
❌ Myth 3: The more grease, the better
✅ Fact: Excessive lubrication will lead to poor heat dissipation and even squeeze the oil seal.
VII. Resumo
The life of automobile bearings depends on the quality of maintenance, driving habits and installation process. Inspeção regular, proper lubrication and avoidance of incorrect operation can greatly extend the service life of bearings. If abnormal noise, shaking or overheating is found, it must be repaired in time to prevent small problems from turning into major failures. For high-end models or performance cars, it is recommended to use original factory-specified bearings to ensure matching and reliability.