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Gear rack is a particular gear whose teeth are distributed on 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 certainly a straight line rather than 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 about the tooth profile gets the same pressure position and is add up to the inclination angle of the tooth profile. This angle is called 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 range parallel to the top line of the tooth and having a tooth thickness equal to the width of the tooth groove is called a dividing collection (middle line), which is a reference range for calculating the size of the rack.
3. The main parameters:
Groove width, high tooth suggestion, high root elevation, tooth height, tooth thickness, root radius, etc.
4. The choice of parameters:
(1) Whether the equipment is beating, the full tooth depth, the common normal collection, the tooth path is qualified, the tooth pitch is poor, and the circumferential section error is out of tolerance.
(2) Whether 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 type of the rack are experienced.
5. Processing methods:
Gear rack and pinion machining technique:
(1) hobbing
(2) gear shaping
(3) shaving
(4) grinding teeth
(5) molars