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## What Is the Torque of a Slewing Bearing? A Complete Guide to Calculation and Performance
Understanding **what is the torque of a slewing bearing** is essential for engineers designing rotating systems. Torque directly determines whether a slewing ring can start, stop, and hold loads without failure. This guide explains torque fundamentals, calculation methods, and performance factors.
### What Torque Means in a Slewing Bearing
**Slewing bearing torque** is the rotational force required to turn the ring under load. It combines friction resistance, raceway deformation, and seal drag. If you want a full definition, what is the torque of a slewing bearing covers the working principle in detail.
### **Types of Torque You Must Distinguish**
#### **Starting Torque**
**Starting torque** is the peak force needed to overcome static friction. It is typically 1.5 to 2.5 times higher than running torque.
#### **Running Torque**
**Running torque** is the steady force during rotation. It depends on speed, load, and lubrication.
#### **Holding Torque**
**Holding torque** prevents rotation when the drive stops. It matters for cranes and solar trackers that lock in position.
### **How to Calculate Slewing Bearing Torque**
Use this basic formula:
**T = Tf + Tz + Ts**
Where:
– **Tf** = friction torque = μ × F × r
– **Tz** = load deformation torque
– **Ts** = seal and race drag
Variables include:
– μ = friction coefficient (0.003–0.01 for greased raceways)
– F = axial, radial, or moment load
– r = raceway radius
### **LSI Factors That Change Torque**
#### **Preload and Clearance**
Tight preload increases torque. Excessive clearance reduces stiffness but lowers drag.
#### **Lubrication**
Grease viscosity changes torque dramatically at low temperature. Synthetic lubricants reduce breakaway torque.
#### **Raceway Geometry**
Four-point contact and double-row designs produce different torque curves under combined loads.
#### **External Loads**
Moments, thrust, and radial forces multiply contact stresses and raise total torque.
### **Common Torque Problems and Solutions**
| Problem | Cause | Fix |
|———|——-|—–|
| High starting torque | Cold grease, rust | Change lubricant, inspect seals |
| Torque spike | Raceway brinelling | Replace bearing, reduce shock load |
| Uneven torque | Gear misalignment | Realign drive pinion |
### **FAQ About Slewing Bearing Torque**
**Q1: Is torque the same as friction?**
No. Torque is the moment; friction is one source of it.
**Q2: Can I calculate torque without load data?**
No. Load, radius, and friction coefficient are mandatory.
**Q3: How often should torque be measured?**
Every 500 operating hours or after any overload event.
**Q4: Does speed affect torque?**
Yes. Higher speed increases viscous drag, especially with grease.
### **Why This Matters for Your Design**
Choosing a **slewing drive** with insufficient torque causes stalling and motor burnout. Oversizing wastes energy and cost. Always verify **what is the torque of a slewing bearing** against actual load spectra.
### **Call to Action**
Need help sizing a slewing ring for your application? **Contact our engineering team today** for a free torque calculation review. We will help you select the right bearing, lubricant, and drive motor to match your exact load profile. **Request a quote now** and stop guessing at torque limits.