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Relevant bibliographies by topics / Gear case

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Academic literature on the topic 'Gear case'

Author: Grafiati

Published: 28 June 2021

Last updated: 28 May 2022

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Journal articles on the topic "Gear case"

1

Bao, Pei De, Jun Xie, Xiao Qin Yin, Qi Zhi Yang, and Lu Zhong Ma. "Elastohydrodynamic Lubrication Design of Planetary Gear Transmission." Advanced Materials Research 228-229 (April 2011): 681–85. http://dx.doi.org/10.4028/www.scientific.net/amr.228-229.681.

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Based on elastic hydrodynamic lubrication (EHL) theory, an EHL model of the meshing between the sun gear and planet gear in planetary gear transmission was established. The EHL oil film thicknesses at meshing areas and those distributions for two operation cases were calculated: one case with the sun gear as the driving gear and another case with the ring gear as the driving gear. The Lubrication with second case was worse. Through the many comparing calculations the lubrication film thickness can be significantly increased by right parameter design. Reasonable raise of lubricant viscosity can get better gear lubrication. Increased gear pressure angle can greatly increase the oil film thickness. The increase of oil film thickness can improve the lubrication of gears and prevent wearing and reduce the production cost of gears, which have great practical value.

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Liu, Dezheng, Yan Li, Zhongren Wang, You Wang, and Yu Wang. "Modeling and Analysis of Effective Case Depth on Meshing Strength of Internal Gear Transmissions." Mathematical Problems in Engineering 2018 (December 30, 2018): 1–12. http://dx.doi.org/10.1155/2018/5153292.

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The effective case depth (ECD) plays an important role in the meshing strength of internal gear transmissions. Carburizing quenching heat treatment is commonly used to enhance gear strength and wear resistance. However, the different ECDs in internal and external gears caused by heat treatment significantly affect the meshing strength, causing vibration, reducing gear service life, and hastening malfunction in internal gear transmission. In this study, we conducted an investigation of different ECDs by the heat treatment of carburized gear pairs by numerical simulation with the finite element method (FEM) and experiment tests. We analyzed three different carburized layer models, with the ECD in the internal gear being greater than, less than, and equal to the ECD in the external gear. In addition, we investigated the ability to distinguish between hardness gradients in gear teeth by dividing the carburized depth into seven layers to improve modeling accuracy. Results revealed that the meshing strength of internal gear transmission could be significantly enhanced by adopting the model with the ECD in the internal gear being less than the ECD in the external gear, and moreover, the shear stress of carburized gears initially increased and then decreased along with depth direction, and the maximum value appeared in the middle of the lower surface.

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Budzik, Grzegorz, Tadeusz Markowski, Michał Batsch, Jadwiga Pisula, Jacek Pacana, and Bogdan Kozik. "Stress Assessment of Gear Teeth in Epicyclic Gear Train for Radial Sedimentation Tank." Acta Mechanica et Automatica 14, no. 3 (September 1, 2020): 121–27. http://dx.doi.org/10.2478/ama-2020-0018.

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Abstract The paper presents the strength evaluation of planetary gear teeth designed for a radial sedimentation tank drive. A novel type of gear drive, composed of a closed epicyclic gear train and an open gear train with internal cycloidal gear mesh is proposed. Contact stress and root stress in the planetary gear train were determined by the finite element method and according to ISO 6336. The influence of the mesh load factor at planet gears on stress values was also established. A comparison of the results followed. It was observed that the mesh load factor on satellites depends mainly on the way the satellites and central wheels are mounted, the positioning accuracy in the carrier and the accuracy of teeth. Subsequently, a material was selected for the particular design of planetary gear and the assumed load. The analysis of the obtained results allowed assuming that in case of gears in class 7 and the rigid mounting of satellites and central wheels, gears should be made of steel for carburizing and hardening. In case of flexible satellites or flexible couplings in the central wheels and gears in class 4, gears can be made of nitriding steel.

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Khodaee, Alireza, and Arne Melander. "Finite Element Simulation as a Tool to Evaluate Gear Quality after Gear Rolling." Key Engineering Materials 554-557 (June 2013): 300–306. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.300.

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Gear rolling is a manufacturing technique for gears with many advantages like reduced material consumption, reduced scrap generation, fast cycle times, good surface quality and improved final properties of the gear wheels compared to conventional production technology based on machining. In order to make use of all these advantages it is desired to reach the final shape of the gear wheel already after rolling. This means that post treatments like grinding should be avoided. This puts high requirements on the shape accuracy after gear rolling. In this paper it was studied if finite element simulation could be used to evaluate the shape accuracy after gear rolling. The measurement of shape accuracy of gear wheels is specified in standards like ISO1328-1. The allowed deviations from nominal shape are often of the order of 10-30 μm for very good qualities. So if such evaluation shall be possible from a finite element simulation the accuracy must be of the same order. In order to have sufficient accuracy of the finite element simulation 2D simulations were performed on a spur gear. The FE code DEFORM was utilized. The shape accuracy was evaluated for gear rolling of two cases. One case had gears with the module of 1 mm. The other case involved gears with a significantly larger module of 4 mm. This was an interesting case since it is known that it is more difficult to roll the gear with good accuracy in large modules.

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Fan, Qin Man, and Yong Hai Wu. "Nonlinear Vibration Characteristics Analysis of Transmission Gears." Advanced Materials Research 282-283 (July 2011): 633–36. http://dx.doi.org/10.4028/www.scientific.net/amr.282-283.633.

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In allusion to a truck transmission gears, a nonlinear vibration model of transmission gears was constructed based on the theory of gear system dynamics and nonlinear dynamics. Basing on the computing platform Matlab and using the Runge-Kutta method to calculate the time history response of gear vibration when the gap exists, and the case of non-resonant and load gear backlash vibration frequency of gear changes were studied. The results of this paper have an important significance to improve the movement of transmission gears to pass accuracy, reduce noise, reduce failures and increase gear life.

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Kampka, Marco, Christoph Löpenhaus, and Fritz Klocke. "Development of a Methodology for Analyzation of the Influence of Pitch Diameter Shift on the Generating Gear Grinding Process." Advanced Materials Research 1140 (August 2016): 149–56. http://dx.doi.org/10.4028/www.scientific.net/amr.1140.149.

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In order to improve load carrying capacity and noise behaviour, case hardened gears are usually hard finished. One possible process for hard finishing of gears is generating gear grinding, which has replaced other grinding processes in batch production of small and middle sized gears due to high process efficiency. Especially generating gear grinding of large module gears with a module higher than mn > 8 mm can be challenging due to high process forces and the resulting excitation, which can influence gear quality negatively. TÜRICH suggested applying a pitch diameter shift during generating gear grinding to equal out the number of contact points between the left and right flanks of the gear with the grinding tool [1]. This qualitative approach is not sufficient to predict the process behaviour because it does not take the changing radii of the curvature of the involute into account and, therefore, the changing contact conditions along the gear profile. In this paper a methodology to quantify the influence of pitch diameter shift on the generating gear grinding process using a manufacturing simulation is introduced. Additionally this methodology is validated for one manufacturing test case.

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Kahraman, A. "Dynamic Analysis of a Multi-Mesh Helical Gear Train." Journal of Mechanical Design 116, no. 3 (September 1, 1994): 706–12. http://dx.doi.org/10.1115/1.2919440.

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In this paper, the dynamic behavior of a multi-mesh helical gear train has been studied. The gear train consists of three helical gears, with one of the gears in mesh with the other two. A three dimensional dynamic model which includes transverse, torsional, axial and rotational (rocking) motions of the flexibility mounted gears has been developed. Two different loading conditions have been identified. In case-I, the system is driven by the gear in the middle, and in case-II, the system is driven by one of the gears at either end of the gear train. The phase difference between the two gear meshes has been determined under each loading condition. The natural modes have been predicted, and their sensitivity to the helix angle and different loading conditions has been quantified. The forced response, which includes dynamic mesh and bearing forces, due to the static transmission error excitation has been obtained. Effects of loading conditions and asymmetric positioning on the response have also been explored.

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Winkler, KJ, S. Schurer, T. Tobie, and K. Stahl. "Investigations on the tooth root bending strength and the fatigue fracture characteristics of case-carburized and shot-peened gears of different sizes." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 21-22 (April 16, 2019): 7338–49. http://dx.doi.org/10.1177/0954406219841650.

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This paper contains data of the research project FVA 293 III by Schurer et al. and investigates the tooth root bending strength and the fatigue fracture characteristics of case-carburized and shot-peened gears of different sizes. The investigated carburized and shot-peened gears are made out of high-purity steel batches of the materials 20MnCr5 and 18CrNiMo7-6. Three different gear sizes with the normal modules mn = 1.5, 5, and 10 mm are examined in pulsator test rigs. Additionally, gear running tests in the FZG back-to-back gear test rigs for the gear size mn = 1.5 are performed.

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Zhao, Yue, and Zheng Hua Huang. "Exploration and Discuss for Calculation of Efficiency Transmission of JG150 Type Gear Trial Set." Applied Mechanics and Materials 155-156 (February 2012): 701–6. http://dx.doi.org/10.4028/www.scientific.net/amm.155-156.701.

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The analyses aim at JG150 type gear trial set and its load device. the analysising and demonstrating aim at the applicability of the transmission efficiency formula of gear case for a closed mechanical system in Mr. Zhu Xiaolu’s book “Trial Technique and Equipments of Gears” (2)in JG150 type gear trial set. According to the analysis and demonstrating, it gives the formula of gear transmission efficiency .

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Krantz, T. L., M. P. Alanou, H. P. Evans, and R. W. Snidle. "Surface Fatigue Lives of Case-Carburized Gears With an Improved Surface Finish." Journal of Tribology 123, no. 4 (January 18, 2001): 709–16. http://dx.doi.org/10.1115/1.1387036.

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Previous research provides qualitative evidence that an improved surface finish can increase the surface fatigue lives of gears. To quantify the influence of surface roughness on life, a set of AISI 9310 steel gears was provided with a near-mirror finish by superfinishing. The effects of the superfinishing on the quality of the gear tooth surfaces were determined using data from metrology, profilometry, and interferometric microscope inspections. The superfinishing reduced the roughness average by about a factor of 5. The superfinished gears were subjected to surface fatigue testing at 1.71 GPa (248-ksi) Hertz contact stress, and the data were compared with the NASA Glenn gear fatigue data base. The lives of gears with superfinished teeth were about four times greater compared with the lives of gears with ground teeth but with otherwise similar quality.

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Dissertations / Theses on the topic "Gear case"

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Wilkinson, Christian Marco Raymond. "The durability of highly loaded, case hardened steel gears." Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/8725.

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Nekzada, Nilofarr. "Life Cycle Assessment : A case study of the Automotive Hydraulic steering gear." Thesis, KTH, Industriell produktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-183090.

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Det här examensarbetet består av en livscykelanalys av en styrsystem. Genom den studien har man försökt att fokusera och ta reda på hur en styrsystem kan påverka miljön genom sin livs längd. Alla faktorer som koldioxid utsläpp, energi-och material använding samt hur mycket detta påverkar miljön har studerats. Eftersom Livscykelanalysen brukar vara tidskrävande och detaljrat, har en enklare metod för snabbare result och analys av styrsystem valts. Den här metoden kallas för fast track LCA, det är en mindre komplicerad metod. Motivationen bakom denna studie är resurshushållning och energieffektivitet. Resultatet från denna analys skall användas för vidareutveckling av hydrualiska styrsystem, vilket skulle kunna ge möjlighet till en förbättring i de nya modellen av styrsystemet. Denna utveckling är tänkt att ske i miljövänlighets syfte. I det avslutande kapitlet tolkas och presenteras resultaten i tabeller och figurer. Baserat på dessa tolkningar kommer resultaten och utvecklingsmöjligheter att diskuterass ytterligare.Utifrån dem dras slutsatsen samt förbättringar från mijösynpunkten föreslås.
This thesis work mainly contains a fast track Life Cycle Assessment (LCA) study of a hydraulic steering gear. The study gives a picture of the hydraulic steering gear through its complete Lifecycle from an environmental point of view. The main motivations behind this study are natural resources conservation and energy efficiency. According to ISO 14040 and 14044 LCA is a complex and time consuming method, the chosen approach for LCA in this study is the Fast Track LCA. The Fast Track LCA gives results which are equally accurate and still could be achieved by taking a shorter way and applying an easier and less complicated method. The intended application of this study is to use the results for further development of the new hydraulic steering gear design, in comparison to the current one. These developments are supposed to be more environmentally friendly. In the final chapter, the findings are interpreted in tables and figures, based on these interpretations the findings are discussed further and the environmentally improvements are suggested and the conclusions are drawn.

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Robertson, Troy A. "A Case Study of Multiple-Use Finish Electrodes for Die-Sinking EDM." TopSCHOLAR®, 2015. https://digitalcommons.wku.edu/theses/1462.

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This study examines the use of one finishing electrode to finish multiple dies without remachining the electrode. The multiple-use electrode finishing experiment in this study addresses technology in the die-forging industry. Methods of manufacturing spherical straight bevel forge gear dies have relied on die-sinking Electrical Discharge Machining (EDM) practices that showed great potential for advancement. The focus of this study is solely on the improvements of electrode use in EDM finishing-processes. The surface finish quality itself is not an area of concern other than maintaining that it does not diminish. The focused concern is maximizing the process by using one electrode unmodified for multiple-finishing operations. The objective for improvement is utilization of one finishing electrode used multiple times rather than only one finishing electrode per die. Utilizing a Coordinate Measuring Machine (CMM), the inspection of specific locations on the finishing electrode reveals the repeatability and accuracy of use for one finishing electrode for six gear forging-dies. Initial experimentation validates the capabilities to finish four dies accurately in two separate die configurations with one electrode. To accomplish finishing the four initial dies, a die-sinking EDM machine that possesses a large enough working envelope was included in the process. The transition of using graphite electrode materials in place of brass for finishing multiple dies aids in reducing what was a total eight-hour process time into a four-hour process time.A machine with a working envelope large enough for only setting up one die to be EDM machined generated the eight-hour process time. The researcher achieved the eight-hour process time by replacing brass electrodes in the roughing stages with graphite electrodes. The extent to which one finish electrode can finish a sample set of six complete dies with one electrode is studied. Data is extrapolated from the deviation of absolute locations on a three-dimensional solid model compared to the multiple-use finishing electrode. Specific locations inspected on the electrode conclude the study efforts with results revealing that the maximum repeated use of an electrode is seven uses.

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Malahova, Anna. "A methodology for developing Web-based CAD/CAM systems : case studies on gear shaper cutters." Thesis, Cranfield University, 2014. http://dspace.lib.cranfield.ac.uk/handle/1826/9299.

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The research establishes a methodology for developing Web-based CAD/CAM software systems to industrial quality standards in a time and cost e ective manner. The methodology de nes the scope of applicability, outlines major considerations and key principles to follow when developing this kind of software, describes an approach to requirements elicitation, resource allocation and collaboration, establishes strategies for overcoming uncertainty and describes the design concerns for industrial Web-based CAD/CAM systems. The crucial parts of the methodology are a novel project development model facilitating architecture optimisation early in the project to minimise total development e orts, create future-proof solutions and ensure system maintainability; and a novel approach for planning based on time reserve management and task prioritisation, which provides the exibility required for exploratory development while maintaining the main focus on project objectives. The e ectiveness of the Web-based CAD/CAM software development methodology has been examined using two real software development case studies: a Web-based CAD/CAM system for involute spur gear shaper cutters and a Web-based CNC code editor for online modi cation of the pro le for manufacturing gear shaper cutters. The development of case studies using the established methodology resulted in on-time delivery of two industrial browser-based CAD/CAM systems, that produce valid results, embrace all business processes associated with the application area, ensure all functional and non-functional requirements and are used in production now. The developed software products demonstrate robustness, performance, reliability, security and usability comparable with the standards of modern commercial software, utilise advantages of Web-based applications to the highest extent and con rm advantages of Web-based CAD/CAM software compared to similar desktop applications. E ectiveness of the proposed methodology for Web-based CAD/CAM software development was checked through validation, evaluation and analysis of case study results.

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Wright, Ian J. "Individual transferable quotas and concentration of the fleet, the case of the Scotia-Fundy mobile gear fleet." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq24946.pdf.

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Kliš, Vojtěch. "Koncepční návrh dvoutoké převodovky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444968.

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This thesis deals with the conceptual design of a double clutch gearbox and the inspection of selected designed parts of this gearbox. The first part of the thesis is focused on the theory of automotive transmissions and analysis of already available double clutch gearboxes. The following is the conceptual design itself, which is based on the selected vehicle on which the transmission will be located and on driving resistances. Based on these default values, the gear graduation is selected, which affects the vehicle’s driving dynamics. With regard to the installation space, a conceptual arrangement of the gearbox is proposed. Furthermore, the thesis is focused on the basic design and calculations of individual functional components of the gearbox. The last part of the thesis is involved to the control of selected structural nodes using the finite element method in the ansys workbench software. The whole thesis describes the individual steps for the design of the basic concept of a double clutch gearbox and the design of their basic components.

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Bayti, Thelma Thokozile. "The link between economic development programmes (RDP & GEAR) and poverty reduction : (Airport Valley as an illustrative case)." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/921.

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The key debates after apartheid have been on the successes and shortcomings of the social and economic policies that were adopted after apartheid. The ANC government decided to approach poverty reduction by closing the inequality gap between racial groups in the country. It planned to provide services that would improve the poor people’s lives and also create employment to sustain development. To provide the necessary services, the government formulated two broad, but linked macroeconomic policies namely: the RDP and GEAR which focused on the demand and supply side respectively (Venter and Landsberg (2006). This indicated the importance with which the people’s welfare and growth were regarded by the South African government. It indicated that the government believed in pro-poor growth. The purpose of this study was to gain better and deeper understanding about poverty reduction since the 1994 political transition, from the poor people of Airport Valley (in the Nelson Mandela Metropolital Municipality), who experience poverty from the real world. The study attempted to find out from these people if there was improvement in their lives since democratisation. This qualitative and quantitative study used three methods of collecting data namely: a questionnaire, interviews and observation. The results of the study suggest that there has been lack of commitment by RDP and GEAR, as the conditions under which the people live and therefore their standard of living have not improved. The study recommends that the government should speed up the process of service delivery at Airport Valley and also include the people in decision making about the future of Airport Valley.

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Pope, Janet M. "How do GEAR UP Program Experiences Support College Readiness| A Qualitative Narrative Multiple-case Study Exploring College Readiness." Thesis, University of Louisiana at Lafayette, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10002425.

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While the American dream could have different meanings for Americans today, one dream for many middle and high school students is to have the opportunity to attend college; however, a challenge facing students across the United States is that they are graduating from middle and high school unprepared to enter the postsecondary institution of their choice. Despite over thirty years of educational reform attempts since “A Nation at Risk” (1983) was published, there continues to be a growing concern that middle and high school graduates are not college and career ready (Choy, Horn, Nunez, & Chen, 2000; Conley, 2010; Jackson, 2009). Consequently, middle and high school students deemed college-eligible are often not college-ready. Students who are not in the top academic quartile in middle and high school may have aspirations of attending college, but often fail college entrance exams (Leonard, 2013). They contend that middle and high school graduation course requirements are often less than rigorous, or misaligned with courses necessary for college admission. Due to the lack of early academic preparation, students may need to take remedial courses once in college (Adelman, 1999). Public universities across the United States invest billions of dollars remediating about one-third of their incoming freshman, which in turn costs students more time and money (Bettinger & Long, 2009; Wimberly & Noeth, 2005). This study explores the fundamental distinctions of college readiness through the examination of a grant project received under the federal college-ready program, Gaining Early Awareness and Readiness for Undergraduate Programs (GEAR UP). The study could reveal important information, which may bring about necessary changes in middle and high schools. By investigating how GEAR UP students describe their experiences with the project, as well as how these experiences contribute to college readiness, student voices and stories may benefit policymakers and administrators as they plan for academic and social supports for future middle and high school students.

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Uhlíř, Jaromír. "Návrh dvouosé automatické univerzální frézovací hlavy osazené elekrovřetenem s aplikací pohonů Harmonic-Drive." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229380.

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The goal of this thesis is to create a survey of possible design solutions to drive milling head. Evaluate them in terms of both economic and technical, then propose a universal milling head so that best met the requirements stated in the award of this work. MT, ÚVSSR, 2010, pages 96, picture 55

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Gulati, Sidhant, Andrea Vacca, and Manuel Rigosi. "A General Method to Determine the Optimal Profile of Porting Grooves in Positive Displacement Machines: the Case of External Gear Machines." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199832.

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In all common hydrostatic pumps, compressibility affects the commutation phases of the displacing chambers, as they switch their connection from/to the inlet to/from the outlet port, leading to pressure peaks, localized cavitation, additional port flow fluctuations and volumetric efficiency reduction. In common pumps, these effects are reduced by proper grooves that realizes gradual port area variation in proximity of these transition regions. This paper presents a method to automatically find the optimal designs of these grooves, taking as reference the case of external gear pumps. The proposed procedure does not assume a specific geometric morphology for the grooves, and it determines the best feasible designs through a multi-objective optimization procedure. A commercial gear pump is used to experimentally demonstrate the potentials of the proposed method, for a particular case aimed at reducing delivery flow oscillations.

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Books on the topic "Gear case"

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Boniol, Frédéric, Virginie Wiels, Yamine Ait Ameur, and Klaus-Dieter Schewe, eds. ABZ 2014: The Landing Gear Case Study. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07512-9.

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Abernathy, Brendan. New owner-occupied housing in the inner city: The case of GEAR. Birmingham: Birmingham Polytechnic, Built Environment Development Centre, 1989.

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Marcie, Jones, ed. Best baby gear. New York: Sterling, 2008.

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Patricia, Cramer, ed. The baby gear guide. Reading, Mass: Addison-Wesley, 1985.

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The essential outdoor gear manual: Equipment care & repair for outdoorspeople. Camden, Me: Ragged Mountain Press, 1995.

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Getchell, Annie. The essential outdoor gear manual: Equipment care, repair, and selection. 2nd ed. Camden, Me: Ragged Mountain Press, 2000.

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Jendrucko, Richard J. Pollution prevention assessment for a manufacturer of gear cases for outboard motors. Cincinnati, OH: U.S. Environmental Protection Agency, National Risk Management Research Laboratory, 1995.

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Wing, Ali. Giggle guide to baby gear: The smart shopping companion for new parents. San Francisco: Chronicle Books, 2008.

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Shifting gears: Planning a new strategy for midlife. New York: Crown Publishers, 1991.

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Peg, Rosen, ed. The girlfriends' guide to baby gear: What to buy, what to borrow, and what to blow off! New York: Berkley Pub. Co., 2003.

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Book chapters on the topic "Gear case"

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Boniol, Frédéric, and Virginie Wiels. "The Landing Gear System Case Study." In Communications in Computer and Information Science, 1–18. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07512-9_1.

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Duane, Sinead, and Christine Domegan. "Case 5: Get Your Life into Gear." In Applying Quality of Life Research:, 79–101. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5878-0_6.

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Kamrani, Ali K., and Emad Abouel Nasr. "DFMo Case Study: Four-Gear Speed Reducer Design." In Engineering Design and Rapid Prototyping, 123–40. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-95863-7_5.

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Banach, Richard. "The Landing Gear Case Study in Hybrid Event-B." In Communications in Computer and Information Science, 126–41. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07512-9_9.

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Savicks, Vitaly, Michael Butler, and John Colley. "Co-simulation Environment for Rodin: Landing Gear Case Study." In Communications in Computer and Information Science, 148–53. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07512-9_11.

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Guertsman, V. Y. "A Case Study of Nose Landing Gear Failure Caused by Fatigue." In ICAF 2011 Structural Integrity: Influence of Efficiency and Green Imperatives, 635–44. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1664-3_51.

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Arcaini, Paolo, Angelo Gargantini, and Elvinia Riccobene. "Modeling and Analyzing Using ASMs: The Landing Gear System Case Study." In Communications in Computer and Information Science, 36–51. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07512-9_3.

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Tesker, Efim I. "Improvement of Methods of Design and Analysis of Load-Carrying Capacity of Case-Hardened Cageless Bearing Units for Power Drives of Mobile Machines." In New Approaches to Gear Design and Production, 461–71. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34945-5_21.

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Kianian, Babak, and Carin Andersson. "Analysis of Manufacturing Costs for Powder Metallurgy (PM) Gear Manufacturing Processes: A Case Study of a Helical Drive Gear." In Sustainable Production, Life Cycle Engineering and Management, 471–87. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6779-7_33.

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Kamrani, Ali K., and Sa’ed M. Salhieh. "Decomposition analysis of a Four-Gear speed reducer design: DFMo case study." In Product Design for Modularity, 123–42. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4757-3581-9_4.

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Conference papers on the topic "Gear case"

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Miyachika, Kouitsu, Satoshi Oda, and Hiroshige Fujio. "Effect of Gear-Side Case-Hardening on Residual Stresses of Case-Hardened Gears." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/ptg-14385.

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Abstract This paper presents a study on effects of the case depth, the case-hardened part, the face width, the rim thickness and the standard pressure angle on residual stresses of case-hardened gears. A heat conduction analysis and an elastic-plastic stress analysis for the case-hardening process of spur gears were carried out by the three-dimensional finite-element method (3D-FEM), and then residual stresses were obtained. It was found that the compressive residual stress σ*θ = 30° at Hofer’s critical section of the end of the face width is smaller in magnitude than that of the middle of the face width, and that the absolute value of σ*θ = 30° of the middle of the face width decreases owing to case-hardening the gear-side and the decreasing rate increases with an increasing case depth and a decreasing face width.

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Maruyama, N., K. Morikawa, and N. Hitomi. "Gear Case Shape and Rib Distribution for Reducing Automobile Transmission Gear Noise." In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0074.

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Abstract This paper deals with an analysis of gear case shape and rib distribution with the aim of reducing automobile transmission gear noise. Modal analysis results and FEM calculations are presented to show that the vibration characteristics of the transmission case are basically determined by its cross section shape. A case with a cocoon section shape, composed of two curved planes, is shown to have greater plane stiffness, resulting in higher natural frequencies and a smaller number of modes in the 0–5 KHz bandwidth. It is concluded that, in order to raise the natural frequency of vibration of a plate mode, a reinforcement rib should be placed orthogonally to the bending direction at the antinode. A simplified formula for estimating natural frequencies with respect to the relationship between flat and ribbed plates is proposed.

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Heingartner, Petra, and David Mba. "Determining Power Losses in Helical Gear Mesh: Case Study." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/ptg-48118.

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Currently legislation is in place to encourage a reduction in energy usage. As such there is an increased demand for machinery with higher efficiencies, not only to reduce the operational costs of the machinery, but also to cut capital expenditure. The power losses associated with the gear mesh can be divided into speed and load dependant losses. This paper reviews some of the mathematical models proposed for the individual components associated with these losses, such as windage, churning, sliding and rolling friction loses. A mathematical model is proposed which predicts the power losses on helical gears highlighting the major contributor to losses in the gear mesh. Furthermore, the mathematical model is validated with a case study.

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Houser, Donald R., Jonny Harianto, Jim Sorenson, Teik C. Lim, Cynthia Myers, Brian Gordon, and Steve Berry. "Case History: Engine Timing Gear Noise Reduction." In Noise & Vibration Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1999. http://dx.doi.org/10.4271/1999-01-1716.

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Krantz, Timothy L., and Robert F. Handschuh. "Gear Tooth Root Stresses of a Very Heavily Loaded Gear Pair: Case Study — Orbiter Body Flap Actuator Pinion and Ring Gear." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46274.

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The space shuttle orbiter’s body flap actuator gearing was assessed as a case study of the stresses for very heavily loaded external-internal gear pairs (meshing pinion and ring gear). For many applications, using the high point of single tooth contact (HPSTC) to locate the position of the tooth force is adequate for assessing the maximum tooth root stress condition. But for aerospace gearing such an approach may be inadequate for assessing the stress condition while also simultaneously minimizing mass. In this work specialized contact analyses and finite element methods were used to study gear tooth stresses of body flap actuator gears. The analytical solutions considered the elastic deformations as an inherent part of the solutions. The ratio for the maximum tooth stresses using the HPSTC approach solutions relative to the contact analysis and finite element solutions were 1.40 for the ring gear and 1.28 for the pinion gear.

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Ruilong, Du, Chen Yinglong, and Zhou Hua. "Investigation on sealing gap between ring gear and case in internal gear machines." In 2015 International Conference on Fluid Power and Mechatronics (FPM). IEEE, 2015. http://dx.doi.org/10.1109/fpm.2015.7337122.

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Ho¨hn, B. R., P. Oster, and T. Tobie. "Systematic Investigations on the Influence of Case Depth on the Pitting and Bending Strength of Case Carburized Gears." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/ptg-48015.

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The influence of case depth on the pitting and bending strength of case carburized gears was investigated. For this purpose an extensive test program on gears of different sizes, different gear geometry and with systematically varied case depth has been carried out. Residual stresses and further characteristics of the case hardened layer — that are influenced by the value of case depth as well — are examined. Based on the test results, rating formulas are derived to calculate the optimum case depth for maximum load capacity. Influence factors are defined, by which the influence of case depth on the load capacity regarding pitting and bending strength can be taken into consideration if rating a gear according to the standardized calculation method of DIN 3990/ISO 6336.

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Ariga, Y., and Shiyeyoshi Nagata. "Research on Gear Cutter Tooth Profile for Semi-Topping: A Case of a Helical Gear." In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0054.

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Abstract Gear tooth tips are frequently chamfered to prevent nicks or scuffing on the tooth surface. Some of the hob cutters and pinion cutters can be chamfered but many types of cutters should be used for a particular range of tooth numbers since the amount chamfering largely varies depending on the tooth number. However, intensive efforts in the design have made it possible to produce cutters with little variation of chamfering amount for a wide range of tooth numbers. The error in the amount of chamfering by a single cutter designed by the above method can be maintained within ±10 % for gears with tooth numbers ranging from 16 to 94. It was found that three cutters of the conventional design are required for keeping the error within the same range for cutting gears within a given range of tooth numbers. The paper describes the tooth design method of the hob cutter with little variation of chamfering amount along changes in number of teeth to be machined and demonstrates that chamfering errors are maintained within practically allowable ranges for profile shift cutting or helical gear cutting with the use of this cutter.

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Nukata, Takanori, Yasuo Arai, Mitsunori Kamimura, Taketoshi Kido, and Masahiko Yamazaki. "Method of Predicting Differential Case Bolt Behavior." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46586.

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This paper proposes a CAE-based method to predict the maximum load at which bolts start to loosen. The qualitative validity of this method was confirmed using the fastening bolts between the differential case and ring gear. In general, the differential case and ring gear are fastened with bolts. Therefore, it is essential to estimate the maximum load of bolt loosening when designing these bolts. Moreover, prototypes found that tightening bolts are more likely to loosen as the thickness of the differential case or ring gear decreases and becomes easier to deform. This indicates that the deformation of the differential case and ring gear must be considered in bolt design. However, predicting the maximum load is relatively difficult because the behavior of both the screw and the contact surface between the differential case and ring gear is complicated. In contrast, recent transmissions require further weight reduction without sacrificing reliability. Consequently, a method of predicting the maximum load of bolt loosening is required. First, this paper describes a CAE model for estimating the pressure and friction generated at the contact surface between the differential case and ring gear, as well as at the screw surface and bolt seating surface. Furthermore, a method for determining bolt loosening is described that incorporates the pressure and friction on the bolt seating surface into friction circle theory. This method was used to derive the maximum load of bolt loosening. In addition, it was also confirmed that the results qualitatively agree with actual cases of bolt loosening. Second, this paper identifies the relative sliding of the screw surface and contact surface when the load increases. In this case, it was verified that the sliding on the contact surface between the differential case and ring gear induces relative sliding of the screw, followed by sliding of the bolt bearing surface and loosening of the bolt. Finally, this paper refers to design guidelines for reducing the weight of the differential case using an experimental design method. Certain ribs cause non-uniform bolt bearing surface pressure distribution, which likely affects bolt loosening. Through this research, the validity of the method was confirmed and the bolt behavior was clarified when a differential case and ring gear are loaded in one direction. Based on these results, it should be possible to apply this method to more complicated load cases in the future.

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Hallett, Edward, Richard Woodward, Simon Schultz, and Ravi Vaidyanathan. "Rapid bicycle gear switching based on physiological cues." In 2015 IEEE International Conference on Automation Science and Engineering (CASE). IEEE, 2015. http://dx.doi.org/10.1109/coase.2015.7294107.

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Reports on the topic "Gear case"

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Jendrucko, R. J., J. A. Myers, and G. P. Looby. Pollution prevention assessment for a manufacturer of gear cases for outboard motors. Office of Scientific and Technical Information (OSTI), September 1995. http://dx.doi.org/10.2172/125052.

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Courtright, E. L. CRADA with the General Motors Corporation and Pacific Northwest National Laboratory (PNL-042): Processing/Property Relationships in Centrifugally Cast AL-MMCs Gears. Office of Scientific and Technical Information (OSTI), March 2000. http://dx.doi.org/10.2172/770366.

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Madrzykowski, Daniel. Firefighter Equipment Operational Environment: Evaluation of Thermal Conditions. UL Firefighter Safety Research Institute, August 2017. http://dx.doi.org/10.54206/102376/igfm4492.

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The goal of this study was to review the available literature to develop a quantitative description of the thermal conditions firefighters and their equipment are exposed to in a structural fire environment. The thermal exposure from the modern fire environment was characterized through the review of fire research studies and fire-ground incidents that provided insight and data to develop a range of quantification. This information was compared with existing standards for firefighting protective equipment to generate a sense of the gap between known information and the need for improved understanding. The comparison of fire conditions with the thermal performance requirements of firefighter protective gear and equipment demonstrates that a fire in a compartment can generate conditions that can fail the equipment that a firefighter wears or uses. The review pointed out the following: 1. The accepted pairing of gas temperature ranges with a corresponding range of heat fluxes does not reflect all compartment fire conditions. There are cases in which the heat flux exceeds the hazard level of the surrounding gas temperature. 2. Thermal conditions can change within seconds. Experimental conditions and incidents were identified in which firefighters would be operating in thermal conditions that were safe for operation based on the temperature and heat flux, but then due to a change in the environment the firefighters would be exposed to conditions that could exceed the protective capabilities of their PPE. 3. Gas velocity is not explicitly considered within the thermal performance requirements. Clothing and equipment tested with a hot air circulating (convection) oven are exposed to gas velocities that measure approximately 1.5 m/s (3 mph). In contrast, the convected hot gas flows within a structure fire could range from 2.3 m/s (5 mph) to 7.0 m/s (15 mph). In cases where the firefighter or equipment would be located in the exhaust portion of a flow path, while operating above the level of the fire, the hot gas velocity could be even higher. This increased hot gas velocity would serve to increase the convective heat transfer rate to the equipment and the firefighter, thereby reducing the safe operating time within the structure. 4. Based on the limited data available, it appears currently available protective clothing enables firefighters to routinely operate in conditions above and beyond the "routine" conditions measured in the fire-ground exposure studies conducted during the 1970s. The fire service and fire standards communities could benefit from an improved understanding of: • real world fire-ground conditions, including temperatures, heat flux, pressure, and chemical exposures; • the impact of convection on the thermal resistance capabilities of firefighting PPE and equipment; and • the benefits of balancing the thermal exposures (thermal performance requirements) across different components of firefighter protective clothing and safety equipment. Because it is unlikely due to trade offs in weight, breathe-ability, usability, cost, etc., that fireproof PPE and equipment will ever be a reality, fire officers and fire chiefs need to consider the capabilities of the protection that their firefighters have when determining fire attack strategies and tactics to ensure that the PPE and equipment is kept within its design operating environment, and that the safety buffer it provides is maintained.

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