Cogwheel vs. Gear — What's the Difference?

Cogwheels, also known as cogged wheels, specifically refer to wheels with teeth or cogs that mesh with other toothed parts to transmit torque. Gears, on the other hand, encompass a broader category of rotating machine parts that include cogwheels but also other types like spur, helical, and bevel gears.

While cogwheels are characterized by their cogs, which can engage with other cogwheels or compatible components, gears can have a variety of shapes and profiles, depending on their intended use and the type of motion they need to transmit.

Cogwheels are often used in mechanical clocks, timers, and other precision machinery where accurate timing and motion are crucial. Gears, in their wider application, are found in numerous devices from simple mechanical toys to complex automotive transmissions, offering a range of functionalities including speed reduction, torque multiplication, and direction change.

The design and manufacturing of cogwheels focus on the precise interaction between the cogs and the mating parts, ensuring minimal slippage and accurate movement. Gear design, however, might prioritize different factors such as strength, noise reduction, or efficiency, depending on the specific type of gear and its application.

In summary, while all cogwheels fall under the category of gears due to their toothed design and function in transmitting motion, not all gears are cogwheels. The term "gear" is a more inclusive term that covers a wide range of toothed or crenelated machine parts.