On the basis of relationship between meshing rigidity and noise and taking the modification, vibration deduction and noise dropping as the aims, the tooth profile modification was carried out on spur bevel gar by the use of revolving involute curve.

Computation results show that meshing rigidity changes greatly with time,indicating that the periodic meshing rigidity is a main source of entire machine vibration.

It provides a new method of exact and speedy calculation on deformation of spur gear teeth and meshing rigidity.

Method for calculating spur gear mesh stiffness;

Following the model,its mesh stiffness matrix and damp matrix are obtained.

The load distribution along different contact lines, load distribution between tooth and mesh stiffness in meshing process are studied.

A simplified caculation of helical gears meshing stiffness;

Based on the mathematical analysis of calculating formulae of spur gear s meshing stiffness, the influencing factors and regularity of spur gear s meshing stiffness are confirmed, and it is indicates that the meshing stiffness of involute spur gear is independent of the gear s modulus.

With a two-stage gear system with time-variant meshing stiffness taken into consideration,the paper established its dynamic equation.

Research on variation law of engaging stiffness in swinging movable teeth drive;

According to change structural parameters of swing movable teeth drive,the change law of engaging stiffness is analyzed by using finite element method.

We find the smallest ring stiffness region in theory, analyze the relationship between the stiffness and eccentricity e, roller radius R1, the roller length b, and propose methods to increase the engaging stiffness.