What's the Difference Between Spur, Helical, Bevel, and Worm Gears?

Here are some basic types of gears and how they are different from each other.

Failure analysis of helical gear pinion - ScienceDirect

Types Of Gear, Spur Gear, Helical Gear, Bevel Gear

Differences Between Worm and Helical Gear

Spur Gears vs. Helical Gears vs. Bevel Gears vs. Worm Gears – ZHY Gear

Influence of gear manufacturer method

Helical Gear: What Are They? How Do They Work? How to Manufacture

An In-Depth Look at Common Gear Types: Explaining the Key

STEP VS IGES

Types of Gears, KHK

China Low Price Spur And Bevel Gear Manufacturers - Spur And Bevel

Creative Journey Final

Spur Gears vs. Helical Gears vs. Bevel Gears vs. Worm Gears – ZHY Gear