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Program: Arrow Gear’s Advanced Design and Development Assistance Capabilities


Part 2 - Developing the Contact Pattern Through Computer Modeling

Developing the Contact Pattern through Computer Modeling – An Overview of the Process

The procedure of developing a contact pattern with Arrow’s system is a very complex process. However, to provide a clear understanding of how the system works, we will first present the conceptual highlights of how a typical development would take place. A more detailed explanation of the steps involved will be presented in the following chapter.

The process begins by Arrow receiving the customer’s design requirements. This would include drawings of the part detailing the critical geometry such as ratio, diametral pitch and so on. In addition, the customer would supply specifications on operating torque and the gear displacements.

Arrow begins the process of contact pattern development by establishing a working file for the part – based on its geometry. Using the CAGE software, a Tooth Contact Analysis study, or TCA, is performed. This indicates the location of the contact pattern without load.

The next step is to perform the loaded TCA, which predicts the contact pattern under load.

Finally a loaded TCA is performed taking into account all the displacement conditions. Once the TCA study is performed for all displacement conditions, the ideal contact pattern is identified.

With this information, a finite element analysis is performed which predicts real stress on the tooth surface as well as the root fillet. This study allows Arrow’s engineers to determine whether there is a potential for failure resulting from excessive or nonuniform pressures on the gear tooth.

For a more detailed explanation of how the TCA and Finite Element studies are actually performed, please progress on to the next chapter.