A Sector gear is a gear that has teeth cut along a section of its circumference only. The remaining portion of the gear has no teeth, so it is smooth.
Sector gears can be applied to applications where less than 360° is required, such as value actuators that only require 90° to open or close. Such configuration may save material, space, and manufacturing costs. Spur, helical, bevel, and/or even worm gears may be used as sector gears.
Typical applications: the aircraft radar because sector gears can scan forward of the plans, the X-ray machine with dual sector gears.
Runsom is a manufacturer of sector gears in wide kinds of materials including aluminum, steel, stainless steel, etc.