Ball Cage Constant Velocity Universal Coupling for Metallurgical and Engineering Machinery
This coupling family covers fixed and sliding types for drives that have to turn at an angle without losing speed accuracy. High dynamic balance accuracy and shock absorbing capability make it a direct substitute for cross shaft universal joints on mill, leveler and casting drives.
- Working angle 0 to 75 degrees
- Maximum torque 380 N·m to 1,000,000 N·m
- Swing diameter 36 mm to 725 mm
- Overload protection available for special conditions
Key Benefits
Why plants specify this coupling.
Complete Constant Speed Performance
Input and output speed stay equal through the angular range, so motion into the rolls is stable.
Compact With High Efficiency
A compact structure with small space occupation suits retrofits where the drive envelope cannot change.
Shock Absorbing And Balanced
Outstanding vibration and shock absorbing capacity plus high dynamic balance accuracy protect the gearbox behind it.
Where It Is Used
Sectors and machines.
- Steel making, continuous casting, hot rolling and cold rolling
- Leveler and rolling mill drive systems in non ferrous plants
- Engineering and mining machinery
- Petroleum and chemical machinery drives
Who It Is For
- Steel plants standardising drive couplings
- Non ferrous processors driving levelers and mills
- Engineering machinery builders
- Maintenance buyers replacing cross shaft joints
Problems It Solves
- Speed fluctuation from cross shaft joints
- Vibration transmitted into gearboxes
- Limited space for a larger coupling
- Overload events damaging the drive train
Technical Features
Two families and one angular range.
Fixed Types
BJ-C, BJ-D, BJ-DT, BJ-DFT, BJ-DY, BJ-DYT, BJ-CY, BJ-CYT and BJ-CT for stable shaft distances.
Sliding Types
DOJ-C, DOJ-F, BOS-F, BOS-FF, BOJ-F, BOJ-C, BOJ-CT, BOJ-D, BOJ-E and BC-P where axial movement has to be absorbed.
Optional Overload Protection
Overload protection devices can be fitted under special working conditions.
Specifications
Model selection follows torque, angle, swing diameter and whether axial stroke is needed.
| Working Angle | 0 to 75 degrees |
|---|---|
| Maximum Torque | 380 N·m to 1,000,000 N·m |
| Swing Diameter | 36 mm to 725 mm |
| Fixed Types | BJ-C, BJ-D, BJ-DT, BJ-DFT, BJ-DY, BJ-DYT, BJ-CY, BJ-CYT, BJ-CT |
| Sliding Types | DOJ-C, DOJ-F, BOS-F, BOS-FF, BOJ-F, BOJ-C, BOJ-CT, BOJ-D, BOJ-E, BC-P |
| Overload Protection | Available for special working conditions |
| Substitute For | Cross shaft universal joints |
Materials
- Forged alloy steel bodies
- Hardened ball tracks
- Sealed grease retained assembly
Manufacturing Process
Model Selection
We match torque, angle and swing diameter against the fixed and sliding model list.
Forging And Machining
Bodies are forged and machined so tracks stay concentric under load.
Heat Treatment And Grinding
Tracks are hardened and ground for contact fatigue life.
Balancing And Assembly
The assembly is dynamically balanced, greased and sealed.
Quality Control
- Torque rating verification against the selected model
- Track hardness and geometry inspection
- Dynamic balance test
- Angular movement check through the rated range
Customization Options
- Fixed or sliding type per drive layout
- Flange and spline to your shaft drawing
- Installed length and stroke to the measured distance
- Overload protection device where required
Use Guide
- Select a model with margin on torque rather than on angle
- Keep normal running angle well under 75 degrees
- Check the coupling after any overload event
- Maintain grease intervals to protect the ball tracks
How It Compares
How it compares within the drive coupling options.
| Cross shaft universal joints | Constant speed transmission and higher dynamic balance accuracy, in a more compact envelope. |
|---|---|
| Drum type spline coupling | Handles much larger working angles, up to 75 degrees, where the spline coupling is limited to a few degrees. |
| Fixed type only supply | The sliding series absorbs axial movement from thermal expansion and roll adjustment. |
Ball Cage Constant Velocity Universal Coupling FAQ
What torque range is available?
From 380 N·m up to 1,000,000 N·m, with swing diameters from 36 mm to 725 mm.
Which model do we need, fixed or sliding?
Fixed types suit drives where the shaft distance stays constant. Sliding types are used where thermal expansion or roll adjustment changes the distance during operation.
Can it work at large angles?
The design range is 0 to 75 degrees with complete constant speed performance throughout.
Is overload protection available?
Yes, overload protection devices can be fitted for special working conditions. Tell us the protection torque you need.
Which industries use this coupling?
Metallurgical machinery, metalworking, engineering machinery, mining, chemical and petroleum machinery.
How do we order a replacement?
Send the model code from the coupling if it is visible, otherwise the flange and spline dimensions with the installed length and the duty data.
Select A Constant Velocity Coupling
Send torque, angle, swing diameter and installed length and our engineers confirm the model.