Author
Luis Magalhaes
Other affiliations: Instituto Superior de Engenharia do Porto, International Student Exchange Programs, Instituto Politécnico Nacional
Bio: Luis Magalhaes is an academic researcher from Bial. The author has contributed to research in topics: Austempering & Adverse effect. The author has an hindex of 9, co-authored 18 publications receiving 276 citations. Previous affiliations of Luis Magalhaes include Instituto Superior de Engenharia do Porto & International Student Exchange Programs.
Papers
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TL;DR: In this paper, the power losses reduction is obtained using two different approaches: using lower modulus helical gears and significant positive profiles shifts and using gear oil formulations with different base oils.
59 citations
TL;DR: In this article, a FEM thermal model was implemented to predict the bulk and flash temperature of gears in general and polymer gears in particular, and a solution for the temperature rise and distribution along the tooth is suggested.
59 citations
TL;DR: In this paper, a systematic experimental evaluation of austempered ductile iron (ADI) as a gear material was performed on the FZG test rig and the results showed that ADI is a material to be considered by gear designers, once the energetic behavior of ADI gears is similar to carburizing gears.
49 citations
TL;DR: In this paper, images concerning crack development at ADI surfaces and sub-surfaces are presented, collected from several twin-disc contact fatigue tests, and several auxiliary surface analysis techniques are used (electronic scanning microscopy, video imaging and perfilometry).
45 citations
TL;DR: In this article, three low-loss gear models were manufactured using standard 20° pressure angle tools and tested in an FZG gear test machine using mineral, ester and polyalphaolephine (PAO)-based oils.
17 citations
Cited by
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TL;DR: In this paper, a numerical prediction on pitting formation is carried out in spur gear made from austempered ductile iron, where general two-dimensional rolling sliding contact situations are considered for the development of the analytical model.
109 citations
TL;DR: In this article, the authors propose a descriptive model of the wear evolution process in rolling bearings over the whole lifetime, which uses a wide range of empirical findings in the literature to describe the wear interactions and evolution in the five-stage scenario: running-in, steadystate, defect initiation, defect propagation, and damage growth.
100 citations
TL;DR: This work reviews gear lubrication papers with focus on gear efficiency, contact fatigue and dynamics, and compile and categorize key investigations in an expansive field with substantial recent research.
99 citations
TL;DR: In this paper, the authors analyze gear efficiency through two different approaches for friction coefficient calculation along the line of action in order to evaluate the possible differences in terms of gear teeth optimization and find out the best behavior about load capacity, safety against wear, noise and vibration.
86 citations
TL;DR: In this paper, theoretical and experimental investigations of bearing arrangements and gear design as well as lubricant type and lubricant supply to the components lead to efficiency optimisation, especially at low temperatures and part load conditions.
Abstract: Purpose – Besides other approaches, fuel savings in automotive applications and energy savings, in general, also require high‐efficiency gearboxes. Different approaches are shown regarding how to further improve gearbox efficiency. This paper aims to address these issues.Design/methodology/approach – The paper takes the following approach: theoretical and experimental investigations of bearing arrangements and gear design as well as lubricant type and lubricant supply to the components lead to efficiency optimisation.Findings – No‐load losses can be reduced, especially at low temperatures and part‐load conditions when using low‐viscosity oils with a high viscosity index and low oil immersion depth or low spray oil supply of the components. Bearing systems can be optimised when using more efficient systems than cross‐loading arrangements with high preload. Low‐loss gears can contribute substantially to load‐dependent power loss reduction in the gear mesh. Low‐friction oils are available for further reducti...
86 citations