Annular Gear

An annular gear is a type of gear that has teeth cut on the outside diameter. It is typically used in conjunction with a pinion gear, which meshes with its teeth to transfer rotational motion. Here are some key characteristics of annular gears:

1. Shape: Annular gears are round in shape and have teeth on their outer circumference. The teeth are usually cut into the outer edge of the gear.
2. Application: They are commonly used in applications where space is limited or where the gear needs to be mounted on the outside of a component. For example, in automotive applications, annular gears are often used as starter rings on flywheels. The starter motor engages with the teeth of the annular gear to crank the engine.
3. Mounting: Annular gears are typically mounted by a shrink fit onto a mating diameter, ensuring a secure connection and proper alignment with the mating pinion gear.
4. Function: When the pinion gear meshes with the teeth of the annular gear, rotational motion is transferred between the two gears, allowing for torque transmission and mechanical power transfer.

Annular gears are designed to provide efficient power transmission while occupying minimal space, making them suitable for various mechanical and automotive applications.