What is the Relationship Between Gearbox Torque and Power? Leave a comment

Torque and power are crucial parameters in the operation of a gearbox. Understanding their relationship helps in selecting the correct gearbox.
Torque: The rotational force generated by the gearbox output shaft, usually measured in Newton-meters (Nm).
Power: The amount of work done per unit of time, typically measured in kilowatts (kW).

The relationship between torque and power is expressed by the following formula:
Power (P) = Torque (T) × Speed (N) / 9550
Where:
P: Power (kilowatts)
T: Torque (Newton-meters)
N: Speed (RPM)

How to Calculate Torque and Power Based on Load Requirements

• Choose Suitable Power: Select the gearbox based on the required power to ensure stable operation without overload.
• Choose Suitable Torque: Determine the required output torque based on the equipment’s load requirements to avoid excessive or insufficient torque affecting efficiency.

Example Calculation

Suppose you need to select a gearbox for a piece of equipment with a load requirement of 5000 Newton-meters (Nm) of torque and a working speed of 100 RPM (revolutions per minute). We will calculate the required power and how to choose the appropriate gearbox based on these requirements.

1. Given Conditions
   • Required output torque: 5000 Nm
   • Working speed: 100 RPM
   • We need to choose a gearbox that can provide these requirements and ensure efficient operation.
2. Calculating the Required Power
   The formula for power is:Power(P)=Torque(T)×Speed(N)/9550 Where P is power (in kilowatts), T is torque (in Newton-meters), and N is speed (in RPM). Plugging in the given values:P=5000 Nm×100 RPM/9550=500000/9550≈52.42 kW Therefore, the required power is approximately 52.42 kilowatts (kW).
3. Selecting the Appropriate Gearbox
   Based on the calculation, the required power is 52.42 kW, with an output torque of 5000 Nm and a working speed of 100 RPM. When selecting the gearbox, we need to consider the following points:
   • Ensure the gearbox can provide at least 5000 Nm of torque output, and its efficiency meets the power requirement of 52.42 kW.
   • Choose the appropriate type of gearbox based on the actual load conditions and working environment, such as planetary gearboxes, helical bevel gearboxes, etc.
   • Select the appropriate gear ratio based on the speed requirement (100 RPM) to ensure the gearbox output speed matches the equipment’s needs.
   For example, if a gearbox with a 10:1 gear ratio is selected and the input speed is 1000 RPM, the output speed will be 100 RPM. The gearbox’s torque output and power will meet the equipment’s requirements, ensuring efficient and stable operation.
4. Conclusion
   Through the above calculations and analysis, we can ensure that the selected gearbox meets the equipment’s torque and power requirements, avoiding overload or inefficiency. The correct gearbox not only improves the equipment’s operational efficiency but also extends its lifespan.

In a gearbox, the input and output power are theoretically the same, but due to mechanical losses, the output power is usually slightly lower. The choice of gear ratio will affect the output torque and power. Typically, a gearbox increases torque but decreases output power.

If you are looking for efficient and reliable gearboxes, CAMEL offers a variety of gearbox models to meet different industrial needs. Browse our products and place your order easily: https://www.gearboxonline.com/shop/

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