What is torque in drive technology?
Torque is one of the key physical quantities in drive systems for transmitting motion and power.
Torque describes the rotational effect of a force around a rotational axis. It indicates how strongly a drive can generate or maintain rotational motion.
Correct sizing has a direct impact on efficiency, service life and operational safety of a system.
Torque explained simply
Torque describes the turning effect created by a force.
In simple words: it shows how strongly a motor, shaft, or coupling can rotate something.
A basic real-world example:
If you loosen a tight screw with a wrench, a longer wrench makes the job easier. The longer lever creates higher torque.
This principle is used in drive technology to transmit force from motors to machines, gearboxes and shaft couplings.
Is torque a force?
Not directly.
A force acts in a straight line. Torque describes the rotational effect of a force. In everyday language it is often called “turning force”, but physically it is not a force. It is the product of force and lever arm.
Torque always depends on two factors:
- applied force
- distance to the rotation point (lever arm)
The formula for torque is:
M = F · r
Where:
- M = Torque
- F = Force
- r = Lever arm
The higher the force or the lever arm, the higher the torque.
What does Nm mean?
Nm stands for Newton meter and is the standard unit for torque.
A torque of 100 Nm means:
- Force: 100 Newton
- Lever arm: 1 meter
The same torque can also be generated by:
- 50 Newton acting on a 2-meter lever arm
- 200 Newton acting on a 0.5-meter lever arm
In practice,
the Newton meter value indicates how much force a drive system can transmit.
Direcction of torque
Torque direction defines the direction of rotation in a system.
A distinction is made between:
- positive torque
- negative torque
The definition depends on standards, coordinate systems, or control settings.
This is especially important in:
- Servo drives
- Robotics
- Positioning systems
- Automation systems
Here, motion must be defined and controlled precisely.
Why is torque important in drive technology?
Correct torque sizing directly affects:
- Service life of components
- Operational safety
- Positioning accuracy
- Energy efficiency
- Maintenance cost
Undersizing torque can lead to:
- Overload
- Vibrations
- Wear
- System failure
Oversizing often results in:
Hihger investment cost and larger installation space requirements
Torque in shaft couplings
Shaft couplings transmit torque between two shafts and compensate for misalignment at the same time.
They must reliably handle:
- axial misalignment
- radial misalignment
- angular misalignment
.
Incorrect selection can cause:
- Vibration
- Increased wear
- Bearing loads
- Coupling damage
- Premature failure
Backlash-free bellows couplings are especially suitable for highly dynamic applications, as they transmit torque precisely without torsional play.
Torque Table for Typical Applications
The following table serves as a general reference for the selection of couplings and associated drive components and is not intended as a design specification.
| Shaft Diameter | Recommended torque | Typical Application |
|---|---|---|
| 10 mm | up to 15 Nm | precision drives |
| 16 mm | up to 60 Nm | machine building |
| 24 mm | up to 200 Nm | conveyor systems |
| 32 mm | up to 500 Nm | production plants |
| 50 mm | up to 1800 Nm | heavy industry |
Note: Final sizing must always consider peak loads, safety factors, and operating conditions.
operating conditions.
In a nutshell
Torque in drive technology describes the rotational effect of a force around an axis and is one of the most important parameters in mechanical and plant engineering.
Correct selection of torque level, torque direction, and torque range determines how precise, efficient, and durable a drive system will operate. Proper consideration of real load conditions in couplings, gear systems, and shafts forms the basis for reliable and economical power transmission.