The author introduces the positive meshing and flexible meshing systems of starter,analyzes the principle,working states,trouble causes and solutions of the two structural styles.

For better meshing performance,included angle between directions of relative velocity and contact line,and induced normal curvature were selected as optimization objects.

The meshing performance and the manufacture of offset cylindrical worm gearing is the primary concern.

From the point of view of tooth flank contact analysis,the effects of design parameters including center distance,module and face width of worm wheel on meshing performance of single enveloping TI(Toroidal Involute) worm gearing are analyzed.

Thepaper develops the generation principle of the gear tooth and the mesh characteristic and deduces the equation of the toothsurface, in order to provide theory.

The paper develops the generation principle of the gear tooth and the mesh characteristic and deduces the equation of the tooth surface, in order .

Finite element analysis on tooth modification of heavy load gears based on the theory of elastic meshing;

On the basis of considering the tooth profile theoretic clearance of inner meshing gear pairs and elastic deformation of gears, the theoretic analytical model was established for number of actual contacting tooth pairs of elastic meshing of three-ring transmission and load distribution among each tooth.