Hypoid gears are similar to spiral bevel gears but with offset shafts, allowing larger pinions for increased strength.

Cycloidal gears use cycloid-shaped teeth for high precision and low backlash performance.

Planetary gear systems consist of a central sun gear, planet gears, and a ring gear, offering multiple gear ratios in a compact design.

Internal gears have teeth on the inside surface of a hollow cylinder and mesh with external gears.

Rack and pinion systems convert rotary motion into linear motion using a round gear (pinion) that meshes with a linear gear (rack).

A worm gear consists of a screw (worm) meshing with a worm wheel, providing high gear reduction in a compact space.

Bevel gears are conically shaped gears designed to transmit motion between intersecting shafts, typically at right angles.

Double helical gears consist of two helical gears with opposite helix angles placed side by side, eliminating axial thrust.

Helical gears have teeth cut at an angle to the axis, forming a helix shape. This design ensures smoother and quieter operation compared to spur gears.

Spur gears are the simplest type of gear, with straight teeth parallel to the axis of rotation. They are easy to manufacture and are widely used for transmitting motion and power between parallel shafts.