Gear Skiving of Involute Internal Spur Gear : (Part 1. On the Tooth Profile)

Internal gears have disadvantages that fewer machine tools can produce them. The most commonly used techinique to produce internal gears is a gear shaping with pinion-type cutter which generates gear flanks with rotating motion and removes chips by reciprocating action. Hobbing and rack shaping are impractical on internal gears. Gear skiving is a new and high productive method to produce internal gears with rotating tool. Skiving tool for internal spur gear is a pinion-type cutter. Skiving cutter and gear blank are mounted on non-intersecting and non-parallel shafts which are at helix angle of pinion-type cutter. In this paper the geometrical relationships between skiving cutter and internal spur gears have been analyzed according to the analytical theory of tooth profile.