In the end face of cylindrical gear, the arc length of reference circle between two sides of tooth profile is called transverse tooth thickness (see Figure 5-9). In terms of standard gear, the value is equal to the width of tooth space. According to GB1356-88, the transverse tooth thickness:
.As for the deflection gear: 
. (“-”used in inner gear while “＋”used in external gear)
The tooth surface between the tip surface and root surface is called tooth flank (see Figure 5-18). Tooth flank consists of three parts: the addendum flank, the dedendum flank and the blending surface.
Hebei GEARX Limited is a manufacturer, specialized in R&D, design and production of enveloping worm gear pairs. GEARX Orientation: a professional solution provider for enveloping worm gearing with small size, light weight and large torque.
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