The contact area of ​​a pair of large and small bevel gears is an important indicator of the quality of the meshing. We found in the production that the gear contact area is irregular after heat treatment; the small end, the partial top and the partial root are all. After analysis, the main reason for the poor contact angle of the conical arc gear is the heat treatment deformation, especially the deformation of the pinion, which increases the radius of the arc, reduces the helix angle, and changes the pressure angle and the tooth pitch.
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