Relevant bibliographies by topics / Gear ratios

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Gear ratios'

Author: Grafiati
Published: 4 June 2021
Last updated: 28 May 2022

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Journal articles on the topic "Gear ratios"

1

Hsieh, Long Chang, Hsiu Chen Tang, Tzu Hsia Chen, and Jhen Hao Gao. "The Kinematic Design of 2K Type Planetary Gear Reducers with High Reduction Ratio." Applied Mechanics and Materials 421 (September 2013): 40–45. http://dx.doi.org/10.4028/www.scientific.net/amm.421.40.

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3K type and 2K-2H type planetary gear trains can be designed to have high reduction ratios. Due to the reason of power circulation, these two kinds of planetary gear trains with high reduction ratios have low meshing efficiencies. The 2K type planetary gear reducer only contain two ring gears and one carrier, hence it will not have the problem of power circulation and will have better meshing efficiency than 3K type and 2K-2H type planetary gear reducers. Also, in general, the gear reducers with high reduction ratio are compound gear system. The purpose of this paper is to propose 2K type planetary simple gear reducers with high reduction ratios. Based on the concept of train value equation, the kinematic design of 2K type planetary gear trains with high reduction ratio are synthesized. Six 2K type planetary gear reducers are designed to illustrate the kinematic design process. Three of the examples are 2K type planetary gear reducers with simple planet gears. For the 2K type planetary simple gear reducer, there is a problem that is the simple planet gear engages to two ring gears with different tooth number. One example is used to illustrate how to design the two ring gears with different shift coefficient to engage the same planet gear. Based on the proposed process, all 2K type planetary simple gear reducers with high reduction ratios can be synthesized.
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Hsu, Cheng-Ho. "An Analytic Methodology for the Kinematic Synthesis of Epicyclic Gear Mechanisms." Journal of Mechanical Design 124, no. 3 (August 6, 2002): 574–76. http://dx.doi.org/10.1115/1.1485094.

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This paper presents an analytic method for the determination of the gear ratios of an epicyclic-type transmission mechanism for a given set of speed ratios. For the transmission mechanism with the associated clutching sequence table, the overall speed ratios are first derived and expressed in terms of the gear ratios of all the mating gears using the concept of fundamental geared entities. Next, the associated speed ratio relations are derived as a criterion to detect the feasibility of any given set of speed ratios. Finally, the transmission mechanism is decomposed into a system of fundamental geared entities such that the gear ratios of all the mating gears are determined from given speed ratios in an analytic way.
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Rackov, Milan, Ivan Knežević, Srđan Nikačević, Dijana Čavić, Mirjana Bojanić Šejat, Marko Penčić, Maja Čavić, Siniša Kuzmanović, and Nicolae Florin Cofaru. "The Results of Changing the Current Solution Concept of Universal Motor Gear Reducers with Helical Gears." MATEC Web of Conferences 343 (2021): 01012. http://dx.doi.org/10.1051/matecconf/202134301012.

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By analysing and comparing the existing solutions of universal gear reducers with helical gears of the leading manufacturers, it can be noticed the effort to increase the load capacity of the gear reducer within the same axis height. In this way, the manufacturers can offer smaller (cheaper) gear reducers, as well as to simultaneously increase the values of the largest gear ratios. This concept enables the offer of lower-stage (cheaper) gear reducers with higher gear ratios in certain segments of gear ratios. By these efforts, it is reached the maximum, but the further increase is possible only by changing the current concept of universal gear drives. Within this paper, it is given an overview and analysis of one of the possible new conceptual solutions of modern universal motor gear reducer.
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Salamandra, Konstantin. "Static analysis and parameters synthesis of planetary-layshaft transmissions with three power flows." MATEC Web of Conferences 224 (2018): 02040. http://dx.doi.org/10.1051/matecconf/201822402040.

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The increase in the number of transmission ratios in the vehicles gearboxes leads to an increase in the number of mechanisms used and their complication. One way to obtain simple designs of multi-speed transmissions with smaller number of gears, clutches, brakes and synchronizers is to use combinations of planetary differential gears and gears with fixed axes (planetary-layshaft transmissions). The article presents a static analysis of a planetary-layshaft transmissions with three parallel power flows for obtaining the dependencies between the gear ratios of the internal mechanisms and the speed ratios of the transmission. A technique for determination the gear ratios of the internal mechanisms for providing a close to a given series of transmission ratios is described.
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Goldfarb, Veniamin I., Evgenii S. Trubachev, Kirill V. Bogdanov, and Tatyana A. Pushkareva. "Prospects of manufacturing spiroid gears with small gear ratios." Forschung im Ingenieurwesen 83, no. 3 (August 21, 2019): 781–91. http://dx.doi.org/10.1007/s10010-019-00343-8.

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Khabrat, N. I., and E. D. Umerov. "Design basis for chain gears with increased gear ratios." Traktory i sel hozmashiny 80, no. 1 (January 15, 2013): 26–28. http://dx.doi.org/10.17816/0321-4443-65884.

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Ways of chain drive improvement are projected on the base of its operation analysis. Calculation and design basis for chain gears with increased gear ratios of long-term operating capacity are developed.
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Hsieh, Long Chang, Teu Hsia Chen, and Hsiu Chen Tang. "On the Kinematic and Meshing Efficiency Analysis of Planetary Gear Reducer with Two Ring Gears." Applied Mechanics and Materials 575 (June 2014): 395–99. http://dx.doi.org/10.4028/www.scientific.net/amm.575.395.

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Planetary gear trains can be used as the gear reducers with high reduction ratio. This paper focused on the kinematic and meshing efficiency analysis of planetary simple gear reducer with two ring gears. First, the planetary simple gear train with two ring gears is proposed by using different shift coefficients. Then, by referring to the train value equation, the reduction-ratio equation is derived for the design the planetary gear reducer with two ring gears. According to reduction-ratio equation, the planetary gear reducers with two ring gears and having reduction ratios (20, 50, and 100) are synthesized. Then, based on the latent power theorem, the meshing efficiency equation of planetary gear train with two ring gears is derived. According to the meshing efficiency equation, the meshing efficiencies of planetary gear trains with two ring gears are analyzed. In this paper, we conclude: (1) Larger reduction ratio makes less meshing efficiency, and (2) The meshing efficiency of planetary gear reducer with two ring gears is not good.
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Walker, Nicola D., David L. Maxwell, Will J. F. Le Quesne, and Simon Jennings. "Estimating efficiency of survey and commercial trawl gears from comparisons of catch-ratios." ICES Journal of Marine Science 74, no. 5 (January 23, 2017): 1448–57. http://dx.doi.org/10.1093/icesjms/fsw250.

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Abstract Assumptions about gear efficiency and catchability influence estimates of abundance, mortality, reference points and catch potential. Despite the need to better quantify fishing effects on some target species and on many non-target species taken as bycatch, there are few gear efficiency estimates for some of the most widely deployed towed fishing gears in the northeast Atlantic. Here, we develop a method that applies generalised additive models to catch-at-length data from trawl surveys and a commercial catch and discard monitoring program in the North Sea to estimate catch-ratios. We then rescale these catch-ratios and fit relationships to estimate gear efficiency. When catches of individuals by species were too low to enable species-specific estimates, gear efficiency was estimated for species-groups. Gear efficiency (and associated uncertainty) at length was ultimately estimated for 75 species, seven species-groups and for up to six types of trawl gear per species or species-group. Results are illustrated for dab (Limanda limanda), grey gurnard (Eutrigula gurnardus) and thornback ray (Raja clavata), two common non-target species and a depleted elasmobranch. All estimates of gear efficiency and uncertainty, by length, species, species-group and gear, are made available in a supplementary data file.
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Polyakov, B. N. "Optimal gear ratios of drives." Russian Engineering Research 27, no. 10 (October 2007): 669–72. http://dx.doi.org/10.3103/s1068798x07100024.

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Syzrantsev, Vladimir, and Ksenia Syzrantseva. "Study of geometric characteristics of the arc teeth semi-rolled cylindrical gear meshing." FME Transactions 49, no. 2 (2021): 367–73. http://dx.doi.org/10.5937/fme2102367s.

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In the conditions of unbraced machine body parts, arc teeth cylindrical gears have a higher load capacity, durability and reliability as well as the ability to compensate for the twist angle by self-adjustment of one of the wheels compared to straight and helical teeth gears. Use of such gears in a semi-rolled version allows simplifying significantly the technological process of cutting wheels and making gears with large gear ratios. In this article, mathematical models of wheel and gear arc teeth forming process are built for a semi-rolled cylindrical gear. The geometric characteristics of the gear arc teeth meshing in the presence of errors in the wheel and gear relative position, required to solve the problem of calculating the gear load capacity and durability, have been determined.
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Dissertations / Theses on the topic "Gear ratios"

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Bejčková, Jana. "Měření zpomalení osobních automobilů při brzdění motorem." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-232895.

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The presented diploma thesis deals with the measurement of car deceleration during engine braking from different starting speeds and different speed gears with a sample of vehicles. This piece of work consists of a theoretical part, where problem background is defined, selected driving parameters including the manner how to measure them are explained and the facts in the field of structural characteristics of the vehicle are given, further from a design of measurement methodology that gives an overall plan of implementation, all the respective information and a description of handling with decelerometer, further from a real measurement of the deceleration including an interpretation of partial obtained values and finally from the evaluation of all results with appropriate conclusions.
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Kašparová, Hana. "Měření zpomalení nákladních automobilů do 12 tun při brzdění motorem." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-233050.

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This thesis deals with braking effect of the truck’s engine. The theoretical part introduces the reader to the basic construction of trucks, describes most using engine and defines the factors having a significant effect on engine braking. In the practical part the reader is familiar with the technique used in making the measurement and description of the vehicle chosen for the implementation of measurement. The result of the practical part is the values obtained by measurement including their interpretation contained in the conclusion.
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Bém, Pavel. "Optimalizace převodových poměrů závodních automobilů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228011.

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Pavel BÉM Optimisation of Gear Ratio for Race Cars DW, IAE, 2008, pp. 62, fig. 69. At first I labellig problems about gearboxes than, I review dataloggers for racing cars using now. I create model of dynamic simulating car move during at akcelerating and decelerating on choice track. I create program analyzating data from telemetry and applicated dynamic model to optimisation gears ratio.
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Sjöberg, Sören. "On the running-in of gears." Licentiate thesis, KTH, Machine Elements, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12750.

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The general trend in gear industry, today, is an increased focus on gear transmission efficiency. Gear transmission efficiency losses arise from loaded and unloaded gear contacts, seals, lubricant and bearings. One way of minimising the losses is to lower the lubricant viscosity. This will reduce the speed dependent losses. However, the load dependent losses might increase. To avoid this, the ratio between lubricant film thickness and surface roughness must be maintained, which can be fulfilled by producing smoother gear surfaces. As a starting point for this realisation process, the present manufacturing processes, the design tools and the characteristics of the gear flank interface must be further investigated and developed. This must be achieved with an emphasis on economic production.

This thesis focuses on our understanding of how different gear manufacturing methods —particularly the contribution of the running-in process—affect the surface characteristics, with the view of increasing gearbox efficiency. The thesis consists of a summary and three appended papers.

Paper A and paper B discuss the relationship between design parameters and real gear wheel surfaces manufactured with different manufacturing methods. The research hypothesis was that the contact area ratio is a descriptive parameter for the contact condition. Paper A deals with the influence of manufacturing method on the initial contact conditions and also serves as a validation of the simulation program used. The emphasis in Paper B is the changes that occur during running-in, and to correlate these changes to design requirements. Paper C approaches the influences of manganese phosphate-coating and lubricants with respect to friction and the risk of scuffing at the initial contact.

The main conclusions of this thesis are that the contact area ratio presents a descriptive measure of how surface topography influences the contact, seen at both a global (form deviation) and local (roughness) level. The surface topography caused by the manufacturing method has a significant influence on the contact area ratio. This is an important result, since neither national standards nor commercially available gear evaluation programs handle surface topography on the local scale. Shaving was found to have the highest contact area ratio, and should therefore be the best choice if deviations from case hardening could be minimised. It is also confirmed that gear-like surfaces coated with manganese phosphate have a low coefficient of friction, and raise the limiting load for scuffing failure enormously compared to the ground equivalent.


QC 20100518
KUGG
Sustainable gear transmission realization
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Li, Kang. "An Investigation into the Torque Capabilities of High Gear Ratio Magnetic Gearboxes." Thesis, The University of North Carolina at Charlotte, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10845412.

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Mechanical gears can be as small as those in traditional mechanical watches or as large as those in mechanical marine turbines. They can be seen in almost all transportation tools, for example, bicycles, cars, trains and airplanes. Though they have been studied and refined for centuries, there are still some disadvantages. For instance, mechanical gears often create a large amount of noise and vibration. They require regular maintenance as the gears need to be lubricated. In addition, if a gear is overloaded it can catastrophically fail.

Unlike conventional mechanical gears, magnetic gears can create speed change without physical contact. The force between magnetic gears is not created by geared teeth but instead, it is created by the magnetic poles. There will be a small air gap between different rotors which means no lubricant or maintenance is required. When one rotor rotates, the other one will also rotate driven by magnetic forces. Since the permanent magnets are used, the forces will not recede or disappear as long as the magnets are not overheated. If overloaded, a magnetic gearbox will simply slip poles. Therefore, in many applications, magnetic gears can be more reliable, efficient and safer.

The goal of this research has been to investigate the torque capabilities of high gear ratio magnetic geared devices. The performance has been investigated based on the gear ratio and torque density.

A new type of flux focusing cycloidal magnetic gear (MG) was investigated that could operate at a gear ratio of -25:1. The flux focusing topology was used because it increased the air gap flux density and therefore enabled a higher torque density. Using 2-D finite element analysis (FEA), the volume torque density was calculated to be 291 Nm/L with an outer diameter of 0.228 m. A -20:1 prototype cycloidal magnetic gear was designed. It had a calculated volumetric torque density of 260 Nm/L. The cycloidal magnetic gear was mechanically difficult to construct and therefore only the inner rotor of the cycloidal magnetic gear was constructed. In addition, the eccentric air gap will cause bearing failure.

To achieve an even higher gear ratio, a nested multistage magnetic gear (MSMG) was designed with a 2-D FEA calculated torque density of 424 Nm/L. The desired gear ratio was 59:1 so that the performance could be compared with a Sumitomo mechanical gearbox which had the same gear ratio. In order to minimize the rotor torque ripple, the harmonic field interaction between the inner stage and the outer stage of the magnetic gear had to be mitigated. A unique flux concentration Halbach rotor structure was proposed. The rotor structure was shown to shield the outer rotor from the inner rotor harmonics. The nested multistage magnetic gear contains 4 rotors and complex mechanical structure. In order to provide sufficient mechanical support, the mechanical axial length had to be very large and this negated many of the benefits of using the nested coaxial rotor structure.

A two-stage series connected 59:1 gear ratio multistage magnetic gear was also designed for wind turbines. The 6.45:1 first stage magnetic gearbox had a diameter of 0.633 m and the 3-D FEA calculated peak torque and torque density were 4.79 kNm and 159 Nm/L. The measured torque and torque density were 4.25 kNm and 141 Nm/L. While the 9.14:1 second stage magnetic gearbox had a diameter of 0.507 m and the 3-D FEA calculated peak torque and torque density were 1.04 kNm and 136 Nm/L, respectively. The series connected multistage magnetic gear had the advantage of being more modular as different gear ratios can be obtained by changing the pole pair combinations for one of the series connected magnetic gears.

A two-stage series connected 59:1 gear ratio multistage magnetic gear was also designed for a hydropower application. Non-magnetic rods were used to reduce the losses and the mechanical deflection. The 2-D calculated torque density for the stage 1 magnetic gear was 371 Nm/L. And the 2-D calculated torque density was 344 Nm/L for the stage 2 magnetic gear. A stator was also designed that was inserted inside the stage 2 magnetic gear. In order to try to reduce the torque ripple, the stator had a fractional winding distribution with 1.25 slots/pole/phase. (Abstract shortened by ProQuest.)

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Fajkus, Jan. "Visualizace cyklických motorů." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2010. http://www.nusl.cz/ntk/nusl-237267.

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This Master's thesis deals with application design and implementation. Application is designed for composition of gears. It is built as a simple computer game. It also contains 3D model renderer, which shows the movement of gears in gearbox. Program is implemented in C language using OpenGL library.
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Biju, Dona. "A parametric study of oil-jet lubrication in gear wheels." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-150786.

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A parametric study of oil-jet lubrication in gear wheels is conducted using Computational Fluid Dynamics (CFD) to study the effect of the different design parameters on the cooling performance in a gearbox. Flow in oil jet lubrication is found to be complex with the formation of oil ligaments and droplets. Various hole radii of 1.5, 2 and 2.5 mm along with five oil velocities is analyzed and it is found that at lower volumetric rates, velocity has more effect on the cooling and at higher volumetric rates, hole size has more effect on the cooling. At higher velocities, the heat transfer is much greater than the actual heat production in the gear wheel, hence these velocity ratios are considered less suitable for jet lubrication. At low velocity ratios of below 2, the oil doesn’t fully impinge the gear bottom land and the sides leading to low cooling. Based on the cooling, impingement length and amount of oil lost to the casing surface, 2 mm hole with a velocity ratio of 2.225 is selected for a successful oil jet lubrication. Varying the inlet position in X, Y and Z directions (horizontal, vertical and lateral respectively) is found to have no improvement on the cooling. Making the oil jet hit the gear wheel surface at an angle is found to increase the cooling. Analysis with the use of a pipe to supply oil was conducted with circular and square inlet and it was found that the heat transfer decreases in both cases due to the splitting of oil jet caused by the combination of the effects of high pressure from the pipe and vorticity in the air field. A method has been developed for two gear analysis using overset meshes which can be used for further studies of jet lubrication in multi-gear systems. Single inlet is found to be better for cooling two gear wheels as it would require a reduced volumetric flow rate compared to double inlets. Oil system requirements for jet lubrication was studied and it was concluded that larger pumps have to be used to provide the high volumetric rates and highly pressurized oil required. On comparing the experimental losses from dip lubrication and the analytical losses for jet lubrication, dip lubrication is found to have lesser loses and more suitable for this case. Good quality lubrication would reduce the fuel consumption and also increase the longevity of gearboxes and hence more research into analyzing alternate lubrication systems can be carried out using the results from this thesis.
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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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New, T. M. "Random road analysis and improved gear ratio selection of a front wheel drive drag racing car." Connect to this title online, 2008. http://etd.lib.clemson.edu/documents/1211387456/.

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Palmer, David. "The effects of profile relief on narrow face width parallel axis gears." Thesis, University of Huddersfield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342563.

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The well established practice of applying tip and/or root relief to the teeth of low contact ratio spur gears is reviewed. Results are presented for the experimental validation of a systematic design method for profile relief that depends critically on how far the relief extends along the path of contact. This method has proved to be effective in controlling gear vibration and noise. A good correlation between static transmission error, dynamic transmission error and sound pressure level was found. This allows design rules to be formulated which can be applied to achieve the minimum vibration and noise levels at a given operating load. A computer program was also developed that allows the introduction of measured gear tooth profiles from an involute tester, to predict the static transmission error curves and thus give an indication of gear quality as regards vibration and noise levels for any given simulated operating load or load range. The computer program was extended to take into consideration the more complex geometry of helical gears using the 'Thin Slice' theory. This allows the prediction of the effects of lead crowning, misalignment, pitch errors and various profile reliefs including relief coined "cross relief", where the relief is applied parallel to the base helix angle. An optimisation routine was included in the computer program that systematically varies the extent of profile relief and amount of lead crowning to minimise transmission error. Since the amount of required profile relief is concomitant with extent of relief and amount of lead crowning (load remaining constant), the program iterates to find the correct amount of profile relief to avoid undesirable comer/tip contact. This new approach has facilitated the generalisation of the effects of profile relief on transmission error for a whole range of typical axial and transverse contact ratios for narrow face width helical gears, previous analyses concentrating on specific designs. Results are also presented for the experimental validation of predicted static transmission error in helical gears. A good correlation between static transmission error, dynamic transmission error and sound pressure level was found as in the spur gear analysis.
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Books on the topic "Gear ratios"

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ill, Dawson Peter, ed. All the right angles: From gear ratios to calculating odds : mathematics in the world of sports. Buffalo, N.Y: Firefly Books (U.S.), 2013.

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Townsend, Dennis P. Surface pitting fatigue life of noninvolute, low-contact-ratio gears. [Washington, D.C.]: NASA, 1990.

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Savage, M. Effects of planetary gear ratio on mean service life. [Washington, DC]: National Aeronautics and Space Administration, U.S. Army Research Laboratory, 1996.

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Savage, M. Effects of planetary gear ratio on mean service life. [Washington, DC]: National Aeronautics and Space Administration, U.S. Army Research Laboratory, 1996.

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Lewicki, David G. Predicted effect of dynamic load on pitting fatigue life for low-contact-ratio spur gears. [Washington, DC]: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986.

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Folenta, Dezi. Design, manufacture, and spin test of high contact ratio helicopter transmission utilizing self-aligning bearingless planetary (SABP). [Washington, D.C.]: National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988.

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W, Lenski Joseph, United States. National Aeronautics and Space Administration., and U.S. Army Research Laboratory., eds. Gear sound levels with various tooth contact ratios and forms. [Washington, DC: National Aeronautics and Space Administration, 1993.

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J, Drago Raymond, United States. National Aeronautics and Space Administration., and U.S. Army Research Laboratory., eds. The relative noise levels of parallel axis gear sets with various contact ratios and gear tooth forms. [Washington, DC]: National Aeronautics and Space Administration, 1993.

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Buckingham, Earle. Manual of Gear Design: Gear Ratio and Mathematical Tables. Industrial Press, Inc., 1999.

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United States. Army Aviation Systems Command. and United States. National Aeronautics and Space Administration., eds. Surface pitting fatigue life of noninvolute, low-contact-ratio gears. [Washington, D.C.]: NASA, 1990.

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Book chapters on the topic "Gear ratios"

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Cuong, Nguyen Manh, Hoang Thi Tham, Tran Thi Hong, Nguyen Van Cuong, Le Hong Ky, Nguyen Thanh Tu, Le Xuan Hung, and Ngoc Pi Vu. "Calculation of Optimum Gear Ratios of Two-Step Worm Gearbox." In Advances in Engineering Research and Application, 179–88. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-37497-6_21.

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Hitziger, Tillmann, Bernd Bertsche, and Anna Krolo. "An Advanced Reliability Test Procedure for Gear-Wheels Considering Results Known from Different Gear Transmission Ratios." In Probabilistic Safety Assessment and Management, 1894–99. London: Springer London, 2004. http://dx.doi.org/10.1007/978-0-85729-410-4_304.

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Kosarev, O. "Selection of Overlap Ratios in Helical Gear with Low Vibration Excitation." In Theory and Practice of Gearing and Transmissions, 369–80. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19740-1_17.

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Crispel, Stein, Pablo López García, Tom Verstraten, Bryan Convens, Elias Saerens, Bram Vanderborght, and Dirk Lefeber. "Introducing Compound Planetary Gears (C-PGTs): A Compact Way to Achieve High Gear Ratios for Wearable Robots." In Biosystems & Biorobotics, 485–89. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01887-0_94.

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Brianza Gordillo, Gerardo, Miguel Ángel Zamarripa Muñoz, and Christian Irving Enrique Rodríguez González. "Speed, Torque and Mathematical Power Relationship Ratios, Using SolidWorks Parametric Designed Spur Gear." In Mechanisms and Machine Science, 571–79. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-55807-9_64.

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Tung, Luu Anh, Tran Thi Hong, Nguyen Van Cuong, Le Hong Ky, Nguyen Thanh Tu, Le Xuan Hung, and Ngoc Pi Vu. "A Study on Determination of Optimum Gear Ratios of a Two-Stage Worm Gearbox." In Advances in Engineering Research and Application, 76–84. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-37497-6_8.

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Pi, Vu Ngoc, Nguyen Khac Tuan, Le Xuan Hung, and Luu Anh Tung. "A New Study on Determination of Optimum Gear Ratios of a Two-Stage Helical Gearbox." In Advances in Material Sciences and Engineering, 107–15. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8297-0_14.

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Quang, Nguyen Huu, Nguyen Thanh Tu, Nguyen Hong Linh, Nguyen Huu Luan, Le Hoang Anh, Nguyen Anh Tuan, Tran Ngoc Giang, and Vu Ngoc Pi. "Determining Optimum Gear Ratios for a Four-Stage Helical Gearbox for Getting Minimum Gearbox Cost." In Advances in Engineering Research and Application, 350–64. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92574-1_36.

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Tuan, Trinh Kieu, Bui Thanh Danh, Nguyen Huu Luan, Nguyen Anh Tuan, Le Hoang Anh, Nguyen Thanh Tu, Tran Ngoc Giang, and Luu Anh Tung. "Optimization of Gear Ratios for Three-Stage Bevel Helical Gearboxes Based on Gearbox Volume Function." In Advances in Engineering Research and Application, 708–20. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92574-1_73.

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Quang, Nguyen Huu, Tran Thi Phuong Thao, Tran Quoc Hoang, Trinh Kieu Tuan, Nguyen Dinh Ngoc, Nguyen Thanh Tu, Tran Ngoc Giang, and Luu Anh Tung. "Determination of Optimum Partial Gear Ratios for Three-Stage Bevel Helical Gearboxes for Cost Function." In Advances in Engineering Research and Application, 312–27. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92574-1_33.

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Conference papers on the topic "Gear ratios"

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Cao, L., K. Chau, C. Lee, and W. Li. "Design and analysis of electromagnetic gears with variable gear ratios." In 2017 IEEE International Magnetics Conference (INTERMAG). IEEE, 2017. http://dx.doi.org/10.1109/intmag.2017.8007834.

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Peng, Zengxiong, Shihua Yuan, Jibin Hu, and Mingfei Gao. "Topological Design of Parallel Hybrid Transmission With Electric Torque Support." 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/detc2015-48062.

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In the last years hybrid Transmissions have spread worldwide in the automotive industry due to their excellent power performance and good fuel economy. The design of parallel hybrid automatic manual transmission (AMT) with electric torque support using one electric motor is a good solution of obtaining high transmission efficiency and low manufacturing cost. The gear pairs between the combustion engine (CE) shaft and electric motor (EM) shaft are assigned to form the new architecture of three degrees of freedom (DOFs) AMT with electric torque support, which provides several CE gears ratios and several EM gears ratios. All theoretical layouts of parallel hybrid AMT with three shafts are presented and classified into four types. And the synthesis of the gear ratios sequence is developed to satisfy power shifting. The gear ratios can be divided into direct gear ratio and generated gear ratio. The ratio design of generated gear is dependent on the ratio of the direct gears, so the design of gear ratio can be transformed into the solution of over-determined nonlinear equations. An algorithm of minimax solution for over-determined nonlinear equations is presented to design and evaluate gear ratios. The three-DOF three-shaft AMT with electric torque support are designed to obtain seven CE gear ratios. This paper helps to further the understanding of the systematic design of parallel hybrid AMT with electric torque support.
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Faysal, Abdullah Al, Sallehuddin Mohamed Haris, and Mohd Hanif Md Saad. "An Axial Magnetic Gear Design with Changeable Ratios." In 2018 8th IEEE International Conference on Control System, Computing and Engineering (ICCSCE). IEEE, 2018. http://dx.doi.org/10.1109/iccsce.2018.8684958.

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Frank, Nicolas W., and Hamid A. Toliyat. "Gearing ratios of a magnetic gear for marine applications." In 2009 IEEE Electric Ship Technologies Symposium (ESTS 2009). IEEE, 2009. http://dx.doi.org/10.1109/ests.2009.4906554.

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Frank, Nicolas W., and Hamid A. Toliyat. "Gearing ratios of a magnetic gear for wind turbines." In 2009 IEEE International Electric Machines and Drives Conference (IEMDC). IEEE, 2009. http://dx.doi.org/10.1109/iemdc.2009.5075359.

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Nguyen, Tuan H. "Compact Design of High-Contact-Ratio Spur Gears." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23052.

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Abstract This study presents a computer simulation for the dynamic design of compact high-contact-ratio spur gear transmissions. High contact ratio gears have the potential to produce lower dynamic tooth loads and minimum root stress but they can be sensitive to tooth profile errors. The analysis presented in this work was performed by using the NASA gear dynamics code DANST (Dynamic Analysis of Spur Gear Transmissions). In the analysis, the addendum ratio (addendum/diametral pitch) was varied over the range 1.30 to 1.40 to obtain a contact ratio of 2.00 or higher. The constraints of bending stress limit and involute interference provide the main criteria for this investigation. Compact design of high-contact-ratio gears with different gear ratios and pressure angles was investigated. Comparison of compact design between low-contact-ratio and high-contact-ratio gears was conducted. With the same operating parameters, high-contact-ratio gears appear to have much more compact design than low-contact-ratio gears. For compact design of high-contact-ratio gears, a diametral pitch of 6.00 appears to be the best choice for an optimal gear set.
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Hernandez, Krista, Dania Wilson, Kyle Ressel, Justus Nwoke, Martin Soto, and M. Salim Azzouz. "Gear Based Quasi-Continuous Variable Transmission for Wind Turbines." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50683.

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Over the past decade wind turbines have been proven to be a competitive contender to produce cheap electricity. Their output electrical power went from few dozens of watts to several megawatts, and this trend is continuing to increase as they become larger in size. Most of these wind turbines are typically regulated through a set of controls acting on the electricity generator workload. These controls are achieved through the use of power electronics controlling the electrical load on the generator for variable speed wind turbine. This paper explores the possibility of implementing an alternative control system in variable wind speed turbines using a special gearbox with a high number of close consecutive discrete gear ratios. The proposed gear based Quasi-Continuous Variable Transmission, called QCVT, allows a variable speed at the input shaft and delivers a quasi-constant speed at the output shaft of the gearbox. The system consists of a special drivetrain assembly of spur gears run and controlled automatically through a set of clutch power shifters. The clutches are used to shift a set of compound gears, thus modifying the drivetrain total gear ratio. The designed system can produce up to 625 gear ratios and acts as a quasi-continuously variable transmission between the wind turbine hub and the electricity generator which requires a constant entry speed delivering a frequency of 60 Hz. The gearing transmission system has been designed using the SolidWorks CAD software for modeling and simulation and the gearing design theory has been used to dimension the special drivetrain assembly of spur gears. The kinematic gearing theory has been used to establish the multitude of close consecutive discrete gearing ratios of the transmission system. A wind driven rotor model for the wind turbine power coefficient has been used to determine the power absorbed by the wind turbine from the blowing wind and the power delivered to the electricity generator. The wind turbine torque generated by the wind and the torque produced at the electricity generator have also been determined using the multitude of gear ratios of the designed drivetrain. A new control law is established to keep the wind turbine generator running at a quasi-constant speed while producing maximum power. Considering the QCVT with its numerous close and consecutive gear ratios as the main torque regulator, the wind turbine system is expected to deliver the right needed torque for a specified electrical load. A set of results featuring how the electricity generator power and torque can be controlled by shifting the ratios of drivetrain transmissions are delivered. A particular emphasis is put on maximizing the generator delivered power using controlled gear ratios while the speed of the wind is changing. A small scale prototype of the QCVT powertrain transmission has been designed and built for concept demonstration and testing purposes.
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Glover, Rodney. "Design of High Speed Gears, Low Load Gears for Minimizing Gear Whine Noise." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-13676.

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The main purpose of the supercharger timing gears is to keep the rotors from contacting each other. They are often lightly loaded and designed for low noise. As timing gears, they have by definition a ratio of 1.0. Furthermore, the timing gears are presently spur gears due to the cost of assembling helical gears onto the rotor shafts without allowing timing errors between the rotors. The original timing gear designs were spur gears with contact ratios slightly above 2.0. A major NVH issue has been gear whine noise, because most applications are in luxury vehicles and are evaluated with the hood open and the engine at idle. In this operating condition, the background noise is very low and any tonal gear whine noise is audible. The first effort was to push the gear manufacturing quality to the limits of modern grinding capability. In order to further reduce gear whine noise, the designs have evolved to finer pitch gearing with a contact ratio over 3.0 to reduce transmission error. Micro-geometries were optimized for low transmission error (TE) at low load. OSU Gear Lab’s RMC and LDP became primary tools in optimizing the gear designs for minimum TE. An important factor when increasing the contact ratio is to not increase the sliding friction significantly to keep the fixed oil sump temperature from increasing too much and cause wear issues in operation. Typically, the new high contact ratio spur gear designs in production have reduced the gear whine levels by more than 6 dB and have had very few noise complaints.
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Karpat, F., B. Engin, O. Dogan, C. Yuce, and T. G. Yilmaz. "Effect of Rim Thickness on Tooth Root Stress and Mesh Stiffness of Internal Gears." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-39181.

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In recent years, internal gears are used commonly in a number of automotive and aerospace applications especially in planetary gear drives. Planetary gears have many advantages such as compactness, large torque-to-weight ratio, large transmission ratios, reduced noise and vibrations. Although internal gears have many advantages, there are not enough studies on it. Designing an internal gear mechanism includes two important parameters. The gear mesh stiffness which is the main excitation source of the system. In this paper, 2D gear models are developed in order to compute gear mesh stiffness for various rim thicknesses and different rim shapes of the internal gear design. Effects of root stress with varying rim thickness and some tooth parameters are investigated by using 2D gear models. The stress calculated according to ISO 6336 and the stresses calculated against FEM are compared. These results are well-matched. It is observed that when the rim thicknesses are increased, both the maximum bending stresses and gear mesh stiffness are decreased considerably.
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Jathar, Jeevan Ramesh. "Methodology to Performance Verification of Close Gear Ratios for SUV." In WCX SAE World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2019. http://dx.doi.org/10.4271/2019-01-1300.

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Reports on the topic "Gear ratios"

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Kumar, T. M. Manoz, Mohan Gangadurai, Vinayak Kathare, and V. Pattabiraman. Optimization of a Manual Transmission Gear Ratios for a Small Cargo Carrier using Statistics-Based Simulation Techniques. Warrendale, PA: SAE International, October 2005. http://dx.doi.org/10.4271/2005-32-0001.

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Kaneko, Yutaka, Kazutaka Adachi, Kimio Kanai, and Yoshimasa Ochi. Design of a Gear Ratio Servo Control System for Toroidal Continuously Variable Transmission. Warrendale, PA: SAE International, May 2005. http://dx.doi.org/10.4271/2005-08-0040.

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Robinson, W. Full-scale evaluation of multi-axial geogrids in road applications. Engineer Research and Development Center (U.S.), March 2022. http://dx.doi.org/10.21079/11681/43549.

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The U.S. Army Engineer Research and Development Center (ERDC) constructed a full-scale unsurfaced test section to evaluate the performance of two prototype geogrids, referred to as NX950 and NX750, in road applications. The test section consisted of a 10-in.-thick crushed aggregate surface layer placed over a very weak 2 California Bearing Ratio (CBR) clay subgrade. Simulated truck traffic was applied using one of ERDC’s specially designed load carts outfitted with a single-axle dual wheel truck gear. Rutting performance and instrumentation response data were monitored at multiple traffic intervals. It was found that the prototype geogrids improved rutting performance when compared to the unstabilized test item, and that the test item containing NX950 had the best rutting performance. Further, instrumentation response data indicated that the geogrids reduced measured pressure and deflection near the surface of the subgrade layer. Pressure response data in the aggregate layer suggested that the geogrids redistributed applied pressure higher in the aggregate layer, effectively changing the measured stress profile with an increase in pavement depth.
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Internal High Ratio Gear Rotary Actuator with Involute Profile for Variable Compression Ratio Systems. SAE International, September 2021. http://dx.doi.org/10.4271/2021-01-5091.

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This paper introduces an internal high ratio gear system with eccentric movement using an involute tooth profile but not the commonly used cycloidal gear profile, and a solution deemed particularly suitable for variable compression ratio actuators. The design challenges of these rotary actuators are discussed, contact ratio values exhibited, and efficiency measurements shown.
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