Bearings
1. Definition & Fundamental Purpose
Bearings are precision mechanical components that enable controlled relative motion between two parts while minimizing friction and handling loads. Their core functions are:
- **Load Support**: Transfer forces between rotating and stationary components
- **Motion Control**: Facilitate smooth linear/rotary movement
- **Friction Reduction**: Replace sliding friction with rolling/sliding contact
2. Major Bearing Classifications
**A. Rolling Element Bearings**
- **Ball Bearings**:
- Deep Groove Ball Bearing (most common)
- Angular Contact (for axial loads)
- Thrust (pure axial loads)
- **Roller Bearings**:
- Cylindrical (high radial capacity)
- Tapered (combined loads)
- Spherical (misalignment compensation)
- Needle (compact design)
**B. Plain Bearings**
- Journal/sleeve bearings
- Bushings
- Thrust washers
