Gear rack is a particular gear whose teeth are distributed on the strip.
1. The basic concept:
The rack is also divided into a spur gear rack and a helical gear rack, which are paired with a spur gear and a helical gear, respectively; the tooth profile of the rack can be a straight line rather than an involute (planar for the tooth surface) , equal to the indexing circle radius is infinite cylindrical gear.
2. The main features:
(1) Because the tooth profile of the rack is direct, each point on the tooth profile has the same pressure position and is equal to the inclination angle of the tooth profile. This angle is named the tooth position and the standard value is 20°.
(2) The same pitch and modulus are given on any of the straight lines parallel to the very best line.
(3) A series parallel to the very best line of the tooth and having a tooth thickness equal to the width of the tooth groove is called a dividing line (middle line), which is a reference series for calculating the size of the rack.
3. The main parameters:
Groove width, high tooth suggestion, high root height, tooth elevation, tooth thickness, root radius, etc.
4. The decision of parameters:
(1) Whether the gear is beating, the entire tooth depth, the common normal series, the tooth path is qualified, the tooth pitch is poor, and the circumferential section error is out of tolerance.
(2) If the installation distance after the gears and racks are installed is suitable.
(3) The rack and gear meshing clearance ought to be 0.25* modulus.
(4) Whether the full tooth depth, runout, and common normal line of the rack are experienced.
5. Processing methods:
Gear rack and pinion machining technique:
(1) hobbing
(2) gear China Air Compressors shaping
(3) shaving
(4) grinding teeth
(5) molars