Slewing Bearings (also known as turntable bearings) are large-scale rotational components designed to handle combined axial, radial, and moment loads in heavy machinery. Our industrial slewing bearings are engineered for extreme durability in the most demanding applications.
Structural Features
Slewing bearings feature two concentric rings with rolling elements between them. Raceways are induction hardened to HRC58-62 for durability and smooth rotation.
Key structural features:
- Forged steel rings – 50Mn or 42CrMo for superior strength
- Hardened raceways – Precision ground for smooth operation
- Rolling elements – Steel balls or cylindrical rollers
- Gear options – External, internal, or gearless
- Sealing system – Rubber seals prevent contamination
- Mounting holes – Through or threaded for easy installation
Gear types:
- External gear – Pinion drives from outside
- Internal gear – Compact pinion inside the ring
- Gearless – Chain or friction wheel drive
Applications
Slewing bearings are widely used in industries requiring heavy-duty rotation and positioning:
- Construction machinery – Cranes, excavators, concrete pumps
- Port machinery – Ship unloaders, container cranes, stacker reclaimers
- Energy industry – Wind turbines, solar trackers, hydroelectric equipment
- Industrial equipment – Rotary tables, indexing equipment, robotic turntables
- Other applications – Medical imaging systems, aerial platforms, offshore equipment
Popular Models
Slewing Bearings Series
FAQ
What is the difference between single-row, double-row and three-row slewing bearings?
Single-row designs (ball or crossed roller) handle combined loads in one raceway. Double-row ball bearings have two independent ball rows for higher capacity. Three-row roller bearings use separate raceways for axial and radial loads, providing the highest load capacity among all types.
How to choose between external gear, internal gear, or gearless?
External gear is most common for active drive applications like cranes. Internal gear saves space when the drive pinion needs to be inside the bearing ring. Gearless is used when rotation is driven by chain, friction wheel, or manual operation.
What is the typical lifespan of a slewing bearing?
Under proper installation, lubrication and normal operating conditions, slewing bearings typically last 10-20 years. Lifespan depends on load conditions, maintenance frequency, and environmental factors.
How to maintain slewing bearings?
Regular maintenance includes: regreasing every 100-200 operating hours, checking bolt torque periodically, inspecting seals for damage, and monitoring for unusual noise or play during operation.