A helical gear is a type of gear that has teeth that are cut at an angle to the axis of rotation. The teeth of a helical gear are arranged in a helix pattern, hence the name "helical." This design allows for a smoother and quieter operation compared to other types of gear.

Helical gears are commonly used in power transmission applications, such as in automobiles, industrial machinery, and robotics. They are often used in pairs, with one gear turning the other, to transmit power between parallel shafts. The angle of the helix determines the contact ratio, which is the number of teeth in contact at any given time. The higher the contact ratio, the smoother the operation of the gear.

Helical gears can be designed with either right-hand or left-hand helix angles, depending on the direction of rotation of the shafts they are connected to. They can also be designed with different numbers of teeth, pitch, and pressure angles to suit specific applications.

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