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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 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 definitely a straight line instead of an involute (planar for the tooth surface) , equivalent to the indexing circle radius is 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 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 given on the direct lines parallel to the very best line.
(3) A series parallel to the very best type of the tooth and having a tooth thickness add up to the width of the tooth groove is called a dividing collection (middle line), which is a reference series for calculating how big is the rack.
3. The main parameters:
Groove width, high tooth suggestion, high root elevation, tooth height, tooth thickness, root radius, etc.
4. The decision of parameters:
(1) Whether the gear is beating, the full tooth depth, the normal normal series, the tooth direction is qualified, the tooth pitch is poor, and the circumferential section mistake has gone 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 complete tooth depth, runout, and common normal line of the rack are experienced.
5. Processing methods:
Gear rack and pinion machining method:
(1) hobbing
(2) gear shaping
(3) shaving
(4) grinding teeth
(5) molars