When hobbing with a rack-type pillar, when the reference line of the rack cutter is tangent to the pitch circle of the rack, the cut gear is a standard gear; when the reference line of the rack cutter is not in line with the pitch circle of the wheel blank When cutting, the gear cut out is a displacement gear.
The distance between the tool reference line and the wheel blank index circle is called the displacement, expressed in xm, and X is called the displacement coefficient.When the tool leaves the center of the blank, X takes a positive value (called positive deflection), otherwise X takes a negative value (called negative deflection).For helical gears, the relationship between the end surface displacement coefficient and the normal displacement coefficient is X1=XN.
After the gear is modified, its tooth shape is involute with the standard gear, but the application field is different.Taking advantage of this feature, a good involute section can be obtained by selecting the variation coefficient X, thereby improving the transmission performance of the gear.The application of the modified gear can avoid undercutting, improve the contact strength of the tooth surface and the bending strength of the tooth root.In addition, modified gears can also be used to match the center distance.
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