Three Dimensional Dynamic Contact of Spur Gear by Using Finite Element Technique.

This template represents the basic guidelines and desired layout final manuscript of Tooth contact stresses are often calculated with the Hertz formula when the tooth load are known. Since the Hertz formula was deduced from two symmetric elastic cylinders, so it is not precise enough for contact stress calculation of gear teeth, also Hertz formula cannot calculate correct stress values of contact teeth. It is widely agreed that the theoretical analysis (FEM by using ANSYS) of spur gears can be performed using 2D approach (point to point). This paper investigates the characteristics of an Involutes gear system including contact stresses between pair of the gears (surface to surface contact)(2D and 3D) for polyimide materials. To enable the investigation of contact problems with Finite Element Method (FEM), the stiffness relationship between the two contacts areas is usually established through a spring placed between the two contacting areas. The results of the two and three dimensional FEM analyses from ANSYS (surface to surface contact) are presented. These stresses are compared between two and three dimensional. Both results agree very well. This indicates that the (FEM) model (surface to surface contact) is accurate more than (point to point) and (Hertz's equations) results because it is very near to the facts. Also the different of the results between two and three dimension are very small and equal (3.95%). [ABSTRACT FROM AUTHOR]