Evaluation of the carrying capacity of Beveloid gears

Project Description

Beveloid gears are spur (or helical) gears with an addendum coefficient that varies linearly along the tooth width. These gears are particularly interesting when mounted with parallel axes, as they can be used to reduce backlash. They are used in transmissions for marine or robotic fields.

Currently, no official method (according to engineering standards) exists for calculating the tooth root load-carrying capacity of bevelled gears. As a result, they are typically approximated using spur gear data from the middle transverse section. However, this method has been shown to be imprecise. To achieve a high power/ weight ratio, a precise calculation of the gear load carrying capacity is necessary.

This project aims to develop a calculation method exploiting Finite Element Analysis (FEA). At the same time, our group is developing an analytical method to rapidly calculate the gears. The FEM analysis is needed to compare the results from the analytical method and make it more precise. Also, experimental tests must be performed to validate both the FEM and the analytical methods.

Prerequisites

• Sound knowledge of basic mathematics;
• basic knowledge of Matlab;
• basic knowledge of FEM/FEA;
• basic knowledge of gears theory.

Not required but good to have:

• Basic knowledge of Standard ISO 6336

Target Objectives

• Conduct a study on beveloid gear meshings;
• use FEM analysis to evaluate the performance of two meshing gears and identify opportunities for improvements in their design and operation.
• develop an improved analytical method for dimensioning beveloid gearbox using Matlab or other programming languages, starting from existing methods and the international gear standard 6336.
• analyze and interpret data from experimental tests to determine the performance and reliability of the gearboxes under real-world operating conditions.
• dimension the key mechanical elements present in precision gearboxes, such as bearings, shafts, and gears.

Expected Results

• Knowledge of the state of the art about gears (beveloid gears in particular) and precision gearboxes;
• development of a method to dimension beveloid gears
• ·erform a Finite Element Analysis of gears;

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