Bevel gears are a type of gears used to transmit power between two shafts that are at an angle to each other. Unlike straight-cut gears, which have teeth that run parallel to the axis of rotation, bevel gears have teeth that are cut at an angle to the axis of rotation.

There are several types of bevel gears, including:

1、Straight bevel gears: These are the simplest type of bevel gears and have straight teeth that are cut perpendicular to the axis of rotation.

2、Spiral bevel gears: These have curved teeth that are cut at an angle to the axis of rotation. This design helps reduce noise and vibration, making them ideal for high-speed applications.

3、Hypoid bevel gears: These are similar to spiral bevel gears but have a more offset shaft angle. This allows them to transmit power more efficiently, making them ideal for heavy-duty applications.

4、Zerol bevel gears: These are similar to straight bevel gears but have teeth that are curved in the axial direction. This design helps reduce noise and vibration, making them ideal for high-precision applications.

 Each type of bevel gear has its own unique advantages and disadvantages, depending on the specific application it is being used for.