Gear rack is a particular gear whose teeth are distributed in the strip.
1. The basic concept:
The rack is also split into a spur gear rack and a helical gear rack, which are China Air Compressor paired with a spur gear and a helical gear, respectively; the tooth profile of the rack is normally a straight line rather than an involute (planar for the tooth surface) , equivalent to the indexing circle radius is definitely infinite cylindrical gear.
2. The main features:
(1) Because the tooth profile of the rack is direct, each point on the tooth profile has the same pressure angle and is add up to the inclination angle of the tooth profile. This angle is called the tooth position and the standard value is 20°.
(2) The same pitch and modulus are provided on the right lines parallel to the very best line.
(3) A range parallel to the very best type 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 collection for calculating the size of the rack.
3. The main parameters:
Groove width, high tooth suggestion, high root elevation, tooth elevation, tooth thickness, root radius, etc.
4. The decision of parameters:
(1) Whether the gear is beating, the full tooth depth, the common normal series, the tooth path is qualified, the tooth pitch is poor, and the circumferential section mistake has gone out of tolerance.
(2) If the installation distance following the gears and racks are installed is suitable.
(3) The rack and gear meshing clearance should be 0.25* modulus.
(4) Whether the full tooth depth, runout, and common normal type of the rack are certified.
5. Processing methods:
Gear rack and pinion machining method:
(1) hobbing
(2) gear shaping
(3) shaving
(4) grinding teeth
(5) molars