Ascertaining the equivalent point position of the starting point of corner contact on the meshing line,the radius from corner contact to gear center and computation of both of the gears load angle of the corner contact point,it also proposes the calculating method of corner contact impact rate.

As a result of deformation of gear tooth under load and machining error, gear meshes outside the normal path of contacting line in the gear tooth meshing start location, and gives birth to meshing-in impact and meshing-out impact, also intitules corner contact impact.

Feasibility study on co-rotating gears transmission of parallel axle with external engagement;

The space perpendicular relationship between the gearing line and the straight generating lines of gear tooth in gear shaving is proved with the analytic mathematics,which can help people understand the relation deeply and can lay down a foundation for making further study of the meshing theory in gear shaving.

The equations of the meshing limit line in the first and second enveloping of the dual-torus double-enveloping toroidal worm drive are presented in this paper.

In this paper,based on the setting mathematical model of hourglass worm gear drive by using the theory of gearing meshing and the knowledge of differential geometry,the program of drawing axial sketch of hourglass worm gear tooth meshing line is worked out and the worm gear tooth meshing line are simulated by using the computer graphic technology.

The gear teeth and meshing line are distorted in the meshing process as a result of wearing and rise in temperature.

In order to extend the type of meshing profile of multiply wraps,the regular polygon involute is proposed to form the profile of multiply wraps.