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Gear rack is a special gear whose teeth are distributed in 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 is a straight line rather than an involute (planar for the tooth surface) , equivalent to the indexing circle radius is definitely infinite cylindrical gear.
2. The main features:
(1) Since the tooth profile of the rack is right, each point about the tooth profile gets the same pressure angle and is equal to the inclination angle of the tooth profile. This angle is named the tooth angle and the typical value is 20°.
(2) The same pitch and modulus are given on the straight lines parallel to the top line.
(3) A range parallel to the very best type 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 line for calculating how big is the rack.
3. The main parameters:
Groove width, high tooth tip, high root height, tooth elevation, tooth thickness, root radius, etc.
4. The choice of parameters:
(1) Whether the gear is beating, the full tooth depth, the common Die Casting normal line, the tooth direction is qualified, the tooth pitch is poor, and the circumferential section mistake is out of tolerance.
(2) If the installation distance following the gears and racks are installed is appropriate.
(3) The rack and gear meshing clearance should be 0.25* modulus.
(4) Whether the full tooth depth, runout, and common normal line of the rack are qualified.
5. Processing methods:
Gear rack and pinion machining method:
(1) hobbing
(2) gear shaping
(3) shaving
(4) grinding teeth
(5) molars