Angle Gear Rack

The tooth profile of the rack is a straight line, so the normals of each point on the tooth profile are parallel. In addition, the rack moves horizontally during transmission, and the speed of each point on the tooth profile is the same in size and direction. Therefore, the pressure angle(Angle Gear Rack) of each point on the rack tooth profile is the same, and its size is equal to the inclination angle of the tooth profile, which is commonly referred to as the tooth profile angle. The standard value is 20 °. It can directly measure the included angle between the tooth surface and the indexing line or the tooth top and root line.

Engagement angle between gear and rack α It is always equal to the pressure angle of the rack end face, because the meshing line is always perpendicular to the rack linear tooth profile and tangent to the gear base circle.

For the pressure angle of gears(Angle Gear Rack), many values can be taken, ranging from 14.5 ° to about 25 °. The smaller the pressure angle of the gear, the higher the transmission efficiency, and the worse the mechanical strength of the gear. The larger the gear pressure angle is, the lower the transmission efficiency is, but the higher the mechanical strength of the teeth is. The inch gear adopts 14.5 ° pressure angle, and the metric gear adopts 20 ° pressure angle, which is mainly considered from interchangeability and universality. We know that for gear processing, each module and each pressure angle requires a gear hob. If a milling machine is used to process gears, the gear milling cutter for each pressure angle requires 8 tooth specifications. In this way, there are too many kinds of cutters for different modules of the whole gear series, especially in wartime, military equipment.

For strong versatility and good interchangeability, the gear specification must be in the module series.

And pressure angle(Angle Gear Rack) should be standardized. 20 ° is the German standard, taking transmission efficiency and strength.

The two indicators are well balanced.

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