1. A new internal gear form grinding method was introduced.

2. The optimum design method of involute internal gear slotting cutter is introduced.

3. A method for grinding internal gear using spherical worm emery wheel is presented.

4. The mechanism of grinding internal gear of spherical worm emery - wheel is researched.

5. To determine the internal gear pair design parameters of two-stage internal contact involute planet gear reducer all constrained conditions from machining to assembly must be satisfied.

6. Internal gear drives are widely used in mechanical driving devices.

7. Gear shape is calculated and interference of planetary gear dedendum and internal gear addendum is avoided.

8. More preferably, a centering reference surface is provided at the tooth tip of the dresser so that the internal gear diamond dresser can be fixed to a machine with higher precision.

9. The epicyclic gear train is connected with the erection seat through the skip key at the internal spline of the sun gear via an internal gear ring, an epicyclic gear and a sun gear.