Abstract
Having a lightweight and efficient gear system could improve engine efficiency that will reduce emission and enhanced fuel economy in order to reduce the global carbon footprint. Gear tends to play a very vital role in all industries. As other mechanical systems, it is subject to design parameter, installation errors, method of manufacture and load uncertainties arising from randomness. Before engineers could design an efficient and safe gear, it is importance to understand on how gear can fail is much needed. This article reviews the methodology used to investigate bending strength of spur gear; Finite Element Method (FEM), Numerical Calculation and Investigational Techniques were usually carried out in order to understand the bending strength of thin-rimmed spur gear. Works and experiment from the literature were studied and their findings were extracted to understand the methods used. The most common method used to investigate bending strength is the numerical calculation. This method was used with several types of established equations and standards to predict gear failures. Next stage is to simulate the gear using Finite Element Method (FEM) in order to get the analysis of gear strength and later to be used for data verification. The most important stage is to put the gears to physical experiment or testing facilities to determine and validate all data from the numerical calculation and FEM method.
Highlights
Nowadays, there are huge demands to have lightweight and efficient gear in the industry especially in aerospace and transportation applications[3]
Failure of gear might occur in various type of modes from wear, bending fatigue, and tooth fracture. It is imperative for engineers and designers to perform an investigation on gear failure and most crucial is gear bending strength
It could be concluded that there are several stages had been done in order to investigate gear bending strength
Summary
There are huge demands to have lightweight and efficient gear in the industry especially in aerospace and transportation applications[3]. Aircraft manufacturers and automakers are showing more interest in developing innovative solutions that reduce emissions with improved fuel economy by reducing weight In gearing applications such as gearbox for vehicles and aircraft, thin-rimmed gears can help to reduce the weight of gearbox. A crack patenting in the root section of gear tooth mostly end up with gear tooth failure from bending fatigue. Finite Elements Method (FEM) used to predict gear failure, estimates gears life in service[14] and later being verified by experimental test on bending strength. On top of numerical calculation and FEM, experimental gear testing is the best approach to find out gear bending strength. Gear design calculations and experimental tests are necessary to develop and confirm a hypothesis for the probable cause of failure [2]
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