Main characteristics of gear rack

A rack is a special gear with teeth distributed on a bar shaped body. Gears are also divided into straight toothed racks and helical toothed racks, which are paired with straight toothed cylindrical gears and helical toothed cylindrical gears respectively; The tooth profile of the rack is a straight line rather than an involute (or a plane for the tooth surface), which is equivalent to a cylindrical gear with an infinite pitch circle radius.
A rack is a strip-shaped component that matches a gear. It is equal to a section of the circumference of a gear with an infinitely large diameter. There are many teeth evenly distributed on one side, which mesh with gears and turn rotation into movement, or turn movement into rotation. A rack is a long strip with teeth on one side, and can be considered as a section of a gear with an infinitely large diameter.
Main features:
(1) Due to the straight tooth profile of the rack, each point on the tooth profile has the same pressure angle, which is equal to the inclination angle of the tooth profile. This angle is called the tooth profile angle, and the standard value is 20 °.
(2) Any straight line parallel to the tooth crest line has the same tooth pitch and modulus.
(3) The straight line parallel to the tooth crest line and with a tooth thickness equal to the tooth groove width is called the dividing line (centerline), which is the reference line for calculating the size of the rack.