How does the number of teeth compare between the internal gear and the external gear in internal-gear pumps?

How does the number of teeth compare between the internal gear and the external gear in internal-gear pumps?

• A. The internal gear has more teeth
• B. They have the same number of teeth
• C. The internal gear has fewer teeth
• D. The external gear has fewer teeth

Answer: (C)

In internal-gear pumps, the internal gear is designed to fit within the external gear. This configuration inherently leads to the internal gear having fewer teeth than the external gear. The external gear encircles the internal gear and therefore must have a greater number of teeth to facilitate proper meshing and operation. The fewer teeth on the internal gear allow it to rotate within the external gear smoothly while providing the necessary pumping action. This design creates a space between the teeth of the internal and external gears that serves as the working chamber, where fluid is trapped, carried around, and ultimately discharged. This relationship between the tooth count and the design of the pump is crucial for achieving the desired flow characteristics and efficiency of the pump. Understanding the gearing dynamics is essential for effective design and troubleshooting of internal gear pump systems.

In internal-gear pumps, the internal gear is designed to fit within the external gear. This configuration inherently leads to the internal gear having fewer teeth than the external gear. The external gear encircles the internal gear and therefore must have a greater number of teeth to facilitate proper meshing and operation.

The fewer teeth on the internal gear allow it to rotate within the external gear smoothly while providing the necessary pumping action. This design creates a space between the teeth of the internal and external gears that serves as the working chamber, where fluid is trapped, carried around, and ultimately discharged.

This relationship between the tooth count and the design of the pump is crucial for achieving the desired flow characteristics and efficiency of the pump. Understanding the gearing dynamics is essential for effective design and troubleshooting of internal gear pump systems.