By use of rectilinear characteristic of involute cutter and according to clock and watch gear drive demands, this paper have put forward involute toothing with double pressure angles.

• 为此，作者利用渐开线刀具的齿廓为直线，刃口成形容易的特点，根据钟表齿轮的传动要求，提出了一种双压力角渐开线齿形。