Gear rack introduction and main feature
A rack is a special gear with teeth distributed on a bar. Racks are also divided into straight racks and helical racks, which are paired with spur gears and helical gears, respectively; the tooth profile of the rack is a straight line rather than an involute (a flat surface for the tooth surface) , Which is equivalent to an infinitely cylindrical gear with an indexing circle radius.
main feature
(1) Because the tooth profile of the rack is straight, all points on the tooth profile have the same pressure angle and are 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 tip line has the same pitch and modulus.
(3) A straight line parallel to the top line of the tooth and having a tooth thickness equal to the width of the tooth groove is called the index line (center line), and it is the reference line for calculating the rack size.
The main parameters
Cogging width, tip height, root height, tooth height, tooth thickness, root radius, etc.
Preferences
(1) The runout of the gear, the full tooth depth, the common normal line, whether the tooth direction is qualified, the tooth swing is different, and whether the cycle error is excessive.
(2) Whether the installation distance of gears and racks is appropriate.
(3) The rack and pinion clearance should be 0.25 * modulus.
(4) Whether the rack's full tooth depth, runout, common normal, especially the tooth direction are acceptable.
The main parameters
Cogging width, tip height, root height, tooth height, tooth thickness, root radius, etc.
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