Módulo 2 de 10 240m 240 min 8 exam Qs 8 exam questions covered
Bearings & Lubrication
Bearing types, installation methods, clearance, seals, lubrication selection, and failure analysis for rotating equipment.
- Identify bearing types and their load characteristics
- Install bearings with correct fit, clearance, and preload
- Select appropriate lubricants for bearing applications
- Analyze bearing failure modes and identify root causes
Lección 1
Bearing Types & Load Characteristics
Rolling Element Bearings
| Bearing Type | Radial Load | Axial Load | Speed | Application |
|---|---|---|---|---|
| Deep groove ball | Good | Moderate | High | Electric motors, pumps |
| Angular contact ball | Good | High (one direction) | High | Machine spindles |
| Cylindrical roller | Excellent | Poor | Moderate | Heavy machinery |
| Tapered roller | Excellent | Excellent | Moderate | Gearboxes, conveyors |
| Spherical roller | Excellent | Good | Moderate | Misaligned shafts |
| Thrust ball | Poor | Excellent | Low | Vertical shafts |
Exam Memory Aid
Ball bearings handle higher speeds; roller bearings handle heavier loads. Tapered rollers handle both radial and axial loads - commonly found in gearboxes. Spherical rollers self-align for misaligned shafts.
Plain (Sleeve) Bearings
Plain bearings use a sliding surface rather than rolling elements. They include:
- Journal bearings - shaft rotates in a cylindrical sleeve
- Babbitt bearings - soft metal lining conforms to the shaft
- Oil film bearings - a pressurized oil film supports the shaft
Key Takeaway
Ball bearings excel at high speed, roller bearings at heavy loads. Tapered rollers handle combined radial and axial loads. Spherical rollers self-align for misaligned applications. Match bearing type to the load, speed, and alignment requirements.