In a gearbox, what is referred to as the Gear Wheel?

• A. The highest speed rotor
• B. The lowest speed rotor
• C. The connecting shaft of the gearbox
• D. The external casing of the gearbox

Answer: (B)

In a gearbox, the term "Gear Wheel" typically refers to the component that is responsible for transferring torque and changing the speed and direction of rotation between the input and output shafts. The Gear Wheel can consist of multiple gears of varying sizes, which work together to alter the speed of the rotating parts.

The lowest speed rotor in this context is significant because it determines the workload and efficiency of the entire system as it is the component that usually interacts directly with the driving force, providing the necessary torque to the output shaft. When gear ratios are calculated, it is essentially this lowest speed rotor that helps in detailing how much the speed is reduced and how the force is multiplied.

Understanding the role of the lowest speed rotor as the Gear Wheel helps in appreciating the design and function of a gearbox, which is crucial in applications where precise speed control and torque are required.