1. Definition
A bearing is a load-carrying mechanical component that facilitates the rotation or movement of two moving parts relative to each other. The purpose is to reduce friction, control heat, and extend lifespan.
2. Basic types
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Ball bearings:
- Rotational movement is achieved by balls.
- Used for low and medium loads, at high speeds.
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Roller bearings:
- Cylindrical, tapered, or needle rollers increase load carrying capacity.
- Suitable for heavy loads and low/medium speeds.
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Fixed or plain bearings:
- Low cost, used in simple applications.
3. Features and use
- Load capacity: Carries radial and axial loads.
- Rotational speed: Bearing selection is based on the system's maximum speed.
- Lubrication: Requires oil or grease for long life.
- Temperature resistance: Must be selected according to the operating environment.
4. Critical criteria for bearing selection
- Load type and magnitude
- Rotational speed and DN value
- Operating temperature
- Environmental conditions (dust, humidity, chemical exposure)
- Ease of installation and maintenance
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