Exactly what is a gear rack?

Gear rack is a particular gear whose teeth are distributed in the strip.
1. The basic concept:
The rack can be 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 Torque Arm account of the rack is certainly a straight line instead of an involute (planar for the tooth surface) , equivalent to the indexing circle radius is certainly infinite cylindrical gear.
2. The main features:
(1) Because the tooth profile of the rack is straight, each point in the tooth profile gets the same pressure position and is equal to the inclination position of the tooth profile. This angle is called the tooth angle and the standard value is 20°.
(2) The same pitch and modulus are given on any of the direct lines parallel to the very best line.
(3) A line parallel to the top type of the tooth and having a tooth thickness add up to the width of the tooth groove is named a dividing range (middle line), which 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 decision of parameters:
(1) Whether the equipment is beating, the full tooth depth, the normal 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 appropriate.
(3) The rack and gear meshing clearance ought to be 0.25* modulus.
(4) Whether the full tooth depth, runout, and common normal type 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


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