What is a gear rack?

Gear rack is a particular gear whose teeth are distributed in the strip.
1. The basic concept:
The rack is also split into a spur gear rack and a helical gear rack, which are paired with a spur gear and a helical gear, respectively; the tooth account of the rack is normally a straight line rather than an involute (planar for the tooth surface) , equivalent to the indexing circle radius is usually infinite cylindrical gear.
2. The main features:
(1) Since the tooth profile of the rack is right, each point in 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 standard value is 20°.
(2) The same pitch and modulus are provided on any of the straight lines parallel to the top line.
(3) A series parallel to the very best line of the tooth and having a tooth thickness add up to the width of the tooth groove is named a dividing collection (middle line), which really is a reference collection for calculating how big is the rack.
3. The main parameters:
Groove width, high tooth tip, high root elevation, tooth height, tooth thickness, root radius, etc.
4. The choice of parameters:
(1) Whether the gear is beating, the entire tooth depth, the common normal range, the tooth direction is qualified, the tooth pitch is poor, and the circumferential section mistake has gone 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 complete tooth depth, runout, and common normal type of the rack are skilled.
5. Processing methods:
Gear rack and pinion machining method:
(1) hobbing
(2) gear shaping
(3) shaving
(4) grinding teeth
(5) molars

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