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 account of the rack is certainly a straight line instead of an involute (planar for the tooth surface) , equal to the indexing circle radius is infinite cylindrical gear.
2. The main features:
(1) Since the tooth profile of the rack is straight, each point in the tooth profile gets the same pressure position and is equal to the inclination position rack and pinionof the tooth profile. This angle is named the tooth position and the standard value is 20°.
(2) The same pitch and modulus are given on the right lines parallel to the top line.
(3) A series parallel to the top line of the tooth and having a tooth thickness add up to the width of the tooth groove is called a dividing range (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 elevation, tooth thickness, root radius, etc.
4. The decision of parameters:
(1) Whether the equipment is beating, the full tooth depth, the normal normal collection, the tooth direction is qualified, the tooth pitch is poor, and the circumferential section error is out of tolerance.
(2) If the installation distance following the gears and racks are installed is appropriate.
(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