Gear rack is a particular gear whose teeth are distributed about 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 a straight line rather than an involute (planar for the tooth surface) , equal to the indexing circle radius is certainly infinite cylindrical gear.
2. The main features:
(1) Since the tooth profile of the rack is right, each point on the tooth profile gets the same pressure angle and is add up to the inclination position 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 any of the right lines parallel to the top line.
(3) A collection parallel to the top type of the tooth and having a tooth thickness add up to the width of the tooth groove is named a dividing collection (middle line), which really is a reference range for calculating how big is the rack.
3. The main parameters:
Groove width, high tooth suggestion, high root height, tooth height, tooth thickness, root radius, etc.
4. The decision of parameters:
(1) Whether the equipment is beating, the entire tooth depth, the common normal line, the tooth path is qualified, the tooth pitch is poor, and the circumferential section mistake is out of tolerance.
(2) If the Water Ring Vacuum Pumps installation distance following the gears and racks are installed is appropriate.
(3) The rack and gear meshing clearance ought to be 0.25* modulus.
(4) Whether the full tooth rack and piniondepth, runout, and common normal type of the rack are skilled.
5. Processing methods:
Gear rack and pinion machining technique:
(1) hobbing
(2) gear shaping
(3) shaving
(4) grinding teeth
(5) molars