A Helical Gear is a type of gear that has angled teeth that wrap around the surface of the gear in a helix pattern. The angled teeth allow the gear to transmit power smoothly and quietly, as the teeth engage gradually instead of all at once. The Helical Gear is used in a wide range of industrial applications, including automotive transmissions, machine tools, and power generation equipment.

Helical Gears are often preferred over other types of gears because of their smooth operation and ability to handle high loads. They are also able to handle both parallel and angular misalignment between the shafts they are connected to, making them more versatile than other types of gears.

There are two main types of Helical Gears: parallel and crossed. In a parallel Helical Gear, the teeth are oriented parallel to the axis of rotation of the gear. In a crossed Helical Gear, the teeth are oriented at an angle to the axis of rotation. Crossed Helical Gears are often used in situations where two shafts are not parallel to each other.

One disadvantage of Helical Gears is that they produce axial thrust forces due to the angle of the teeth. This can result in increased wear on bearings and other components if not properly accounted for in the design. Additionally, Helical Gears are more difficult to manufacture than some other types of gears, due to the angled teeth and the need for specialized cutting tools.