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Gear rack is a particular gear whose teeth are distributed about 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 account of the rack is a straight line rather than an involute (planar for the tooth surface) , equal to the indexing circle radius is definitely infinite cylindrical gear.
2. The main features:
(1) Because the tooth profile of the rack is right, each point on the tooth profile gets the same pressure position and is equal to the inclination position of the tooth profile. This angle is named 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 very best type of the tooth and having a tooth thickness equal to the width of the tooth groove is named a dividing line (middle line), which really is a reference series for calculating the size of the rack.
3. The main parameters:
Groove width, high tooth suggestion, high root height, tooth elevation, 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 error has gone out of tolerance.
(2) If the installation distance after the gears and racks are installed is suitable.
(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 experienced.
5. Processing methods:
Gear rack and pinion machining method:
(1) hobbing
(2) gear shaping
(3) shaving
(4) grinding teeth
(5) molars