This paper describes a meshing analysis of the contrate harmonic gear drive which can quickly select the optimum transmission and determine the corresponding meshing parameters and structure parameters.

The effective method with direct utilizing of offset surface of tooth on the centerpoint at the probe of the three-coordinate measuring machine to carry out meshing analysison real tooth surface is put forward compared with the method of constructing curvedsurfaces two times.

In this paper a mathematical model about meshing analysis of double enveloping worm gearing with straight side profile is set up and various modification parameters available in manufacturing are introduced and a software package is developed successfully.

3D engagement analysis on gear pair of transmission system of turbine starter;

Through an analysis of gearing theory on epicycloidal bevel gears,the equation of the angle during meshing and the parameters for the gears are obtained,and the approximate formulae to calculate the contact ratio of the epicycloidal bevel gears is derived.