Spherical plain bearings (also called joint bearings) are spherical sliding bearings with exceptional load capacity, impact resistance, and self-aligning capability. Their unique spherical contact structure allows angular movement in any direction (typically up to 5°-15°), making them indispensable components in:
- Construction machinery (excavators, cranes)
- Machine tools
- Aerospace systems
- Automotive manufacturing
- Robotic joints
1. Radial Spherical Plain Bearings (GE Series)
Designed primarily for radial loads, these consist of:
- Lubricated type: Inner ring + outer ring (requires periodic greasing)
- Self-lubricating type: Inner ring + outer ring + PTFE composite layer
Key Models Comparison
| Model | Features | Application Example |
|---|---|---|
| GE…ES | Single-split outer ring with lubrication groove | Low-speed oscillating mechanisms |
| GE…ES-2RS | Double rubber seals for dust protection | Construction equipment in dusty environments |
| GEEW…ES | Wider outer ring for increased stiffness | Robotic arm connections |
| GEH…ES | Heavy-duty design (30% higher capacity) | Mining equipment |
| GEC…FSA | Self-lubricating with fixing screw | Frequent oscillation applications |
| GEC…HT-2RS | High-temperature resistant + double seals | China standard equivalent to SKF GE…ET-2RS |
2. Angular Contact Spherical Bearings (GAC Series)
Handle combined radial and axial loads (axial ≤70% of radial load):
- Contact angle: 25°-30°
- Self-lubricating versions use PTFE liners
- Common in machine tool spindles
3. Thrust Spherical Bearings (GX Series)
Primarily withstand axial loads (radial ≤50% of axial load):
- Shaft washer material: Hardened steel
- Self-lubricating type: Bronze-plated washer + PTFE
- Example: GX30S (30mm bore, 15kN static load)
4. Rod End Bearings
Combine radial bearings with threaded rods for linkage applications:
| Type | SKF Code | China Code | Maintenance |
|---|---|---|---|
| External Thread | GE…C | GEC…H | Requires lubrication |
| Internal Thread (Self-lubricating) | GEM…S | GEH…HT | Maintenance-free |
Selection Guidelines
- Load direction: Pure radial → GE series; Combined loads → GAC series
- Environment: High temp (>150°C) → Choose HT suffix models
- Maintenance: Hard-to-access locations → Self-lubricating types
Why Choose Our Spherical Bearings?
- Manufactured to both SKF and Chinese standards (GEC…HT-2RS)
- Custom solutions available for extreme conditions
- ISO 9001 certified production
- Global shipping with technical support