# How to calculate maximum gearbox input torque

• SevenToFive
In summary, calculating the maximum gearbox input torque involves determining the maximum input power and maximum input speed, and then dividing the power by the speed to obtain the torque. This calculation is important in designing and selecting gearboxes for various applications, as it ensures that the gearbox can handle the required torque without failing. Factors such as gear ratio, gear efficiency, and safety factors should also be considered in the calculation. Additionally, external factors such as vibrations and shock loads should be taken into account to ensure the longevity and reliability of the gearbox.
SevenToFive
I am a bit confused by a customer and their request to know what the maximum torque he can apply to a gearbox when the motor input speed is 258rpm.
The motor is a 2HP brakemotor, 1750rpm at 60Hz, 460VAC 3phase, 1.65 amps motor tested.
The gearbox has a 200:1 ratio rated for 0.093HP with an input speed of 258rpm, with a standard 1750rpm input speed the same gearbox is rated for 0.633HP.

Any help in clearing up how to calculate maximum input torque would be greatly appreciated. Thanks to all who reply.

## 1. What is maximum gearbox input torque?

Maximum gearbox input torque is the maximum amount of torque that can be applied to the input shaft of a gearbox without causing damage to the gearbox or its components.

## 2. How is maximum gearbox input torque calculated?

Maximum gearbox input torque can be calculated by multiplying the maximum input speed of the gearbox by the maximum input power and dividing the result by the gear ratio.

## 3. What factors affect the maximum gearbox input torque?

The maximum gearbox input torque is affected by the materials and design of the gears, the lubrication and cooling system, the bearing types and sizes, and the overall strength and durability of the gearbox.

## 4. Why is it important to calculate maximum gearbox input torque?

Calculating maximum gearbox input torque is important because it ensures that the gearbox is operating within its safe limits and can handle the required power and torque without failure. It also helps in selecting the appropriate gearbox for a specific application.

## 5. How can maximum gearbox input torque be increased?

The maximum gearbox input torque can be increased by using stronger and more durable materials for the gears and other components, improving the lubrication and cooling system, and optimizing the design of the gearbox for maximum efficiency and strength.

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