This text will not deal with the stress analysis aspects of gear design. The ratio of the pitch circles of mating gears defines the speed ratio and the mechanical advantage of the gear set. Apr 18, 2018 heello everyone, in this video, we are going to design epicyclic planetary gear driv with motion analysis using solidworks. The second type uses the planetary gear trains as the basic topological unit. Design and characterization of a new planetary gear box. In the texts chapters, readers can find all the information needed for various types of gear trains, with illustrations and examples. In the reverted planetary train illustrated, find the. Sun gear is located at the center that transmits torque to planet gears orbiting around the sun gear.
D rotation of driver per revolution of follower or the driven gear or pulley. The tool investigated is from atlas copco st series and consists of three main parts. Just gears itself can be a career that may need 56 lifetimes to fully grasp all aspects of engineering. Design, load analysis and optimization of compound. How to i design a planetary gear with a gear ratio of 2. Kiril borisov arnaudov is a leading expert in the area of gear design. An epicyclic gear train consists of two gears mounted so that the center of one gear revolves. The authors help gear designers to creatively understand the design of gears, as well as master the mechanical calculations needed.
Working out the tooth counts for planetary gears is actually not that complicated, so i initially neglected to mention how to do it. H the operation and kinematic analysis of a novel cambased infinitely variable transmission. Recent articles in gear solutions have discussed epicyclic gearing, but often in the context of experienced engineers. Planetary gear trains gears and gear drives wiley online. The grabcad library offers millions of free cad designs, cad files, and 3d models. The noload power losses produced by the planetary gear train are determined from direct torque measurements by a strain gauged sensor.
This book provides comprehensive information for various planetary gear trains, with. In the texts chapters, readers can find all the information needed for various types of. Genetic approach for multiobjective optimization of epicyclical gear. Design, load analysis and optimization of compound epicyclic. The time to find this answer is at the design stage not when it adds a complication at assembly. Its wellreasoned definitions and classifications will aid engineers in the selection and design of the best drives for any given application. Each planetary gear train only contains three basic links.
The planets usually mesh with sun, or central, gears that rotate about the shaft of the mechanism or are fixed. The book reflects not only teaching, but also the practical experience of the authors. Now that weve looked at epicyclic gear types and arrangements and their unique design characteristics, as well as several examples, lets discuss the dos and donts of epicyclic gear design. The epicyclic gear train family in general has a central sun gear which meshes with and is surrounded by planet gears. Previous investigators, for the most part, have not considered load variations which normally occur because of the elastic nature of the gear train elements. Epicyclic gear train overdrives are so arranged that the input shaft drives the pinion carrier while the output shaft is driven by the annular gear ring figs 3. This book presents a clear and concise description of a multitude of revolving gear trains in terms common to all, whereas previous publications have been limited to treatment on interesting subproblems. Planetary gear ratio calculations this article also available in spanish. The world of planetary gears planetary gears, which can supply a lot of speed reduction and torque in a small package, have operating characteristics beyond those of fixedaxis gear trains charles.
The outermost gear, the ring gear, meshes with each of the planet gears. Design, modelling and analysis of a 3 stage epicyclic planetary reduction gear unit of a flight vehicle k akhila1 and m amarnath reddy2 corresponding author. Research laboratory new design and improvement of planetary. New design and improvement of planetary gear trains. Thus the loads have to be minimum to reduce the stresses in the gear train. A simple method for calculating planetary gear ratios is described which can be used to determine quickly the potential usefulness of any planetary configurations. Lightweight design for planetary gear transmissions. The research program covers basic ideas of the design of the proposed gear drives. Oct 06, 2014 depends on what level you want to go and what is your background. Planetary gear trains kiril arnaudov, dimitar petkov karaivanov on amazon. An epicyclic gear train also known as planetary gear consists of two gears mounted so that the center of one gear revolves around the center of the other.
Heello everyone, in this video, we are going to design epicyclic planetary gear driv with motion analysis using solidworks. This book provides comprehensive information for various planetary gear trains, with practical applications and comprehensive references to technical articles. A planetary gear train provides high gear reduction in a compact package. Planetary gear trains gears and gear drives wiley online library. Usually the analysis is made considering constant torques applied to the input member.
An approach for the kinematic design of threespeed gear mechanisms for electric bicycles. An electric motor operates the planetary gear train via a belt multiplying the rotational speed of the planetcarrier up to a maximum of 6000 rpm, i. A question that i often get is how to work out planetary gears using the gear template generator. A gear train hav ing a relative motion of axes is called planetary or an epicyclic gear train. Planetary gear trains are one of the main subdivisions of the simple epicyclic gear train family. This book provides comprehensive information for various planetary gear trains, with practical applications and. Solid mechanics tutorial gear systems this work covers elements of the syllabus for the edexcel module 21722p hncd mechanical principles outcome 3. There are no great advances in gear technology described. Planetary gear trains is the most comprehensive and uptodate work available in this key technical area.
The determination of optimal design of the planetary gear train with a lightweight, a short center distance, and a high efficiency is an important issue in the. Planetary gear trains the main problems gathered in a book. We use cookies to offer you a better experience, personalize content, tailor advertising, provide social media features, and better understand the use of our services. New types of planetary face gear drives the developed face gear drives are shown in figs. A complete gear train design will necessarily involve considerations of strength of materials and the complicated stress states to which gear teeth are subjected. Planetary gears planetary gear trains are one of the main subdivisions of the simple epicyclic gear train family. Traxxas 2388x complete planetary gear differential with steel ring gear.
Join the grabcad community today to gain access and download. A complete gear train design will necessarily involve considerations of strength of. One of the planetary gearsets from our transmission has a ring gear with 72 teeth and a sun gear with 30 teeth. Lightweight design for planetary gear transmissions berndrobert hohn, karsten stahl and philipp gwinner there is a great need for future powertrains in automotive and industrial applications to improve upon their efficiency and power. Jan 03, 2016 as we are well aware now that in case of one planetary gear unit, there will be two or more than two planet gears, therefore the torsional stiffness of the planetary gear unit will be higher by a factor of n as compared to a traditional gear train. As we are well aware now that in case of one planetary gear unit, there will be two or more than two planet gears, therefore the torsional stiffness of the planetary gear unit will be higher by a factor of n as compared to a traditional gear train. The epicyclic gear train model is taken from bhel, and some of its parameters have been. Things should be made as simple as possible, but no simpler. N is used here to mention the number of planet gears in planetary gear unit.
Gear design national broach and machine division,of lear siegler, inc. The noload power losses produced by the planetary gear train are determined from direct torque measurements by. The authors help gear designers to creatively understand the design of gears. In the reverted planetary train illustrated, find the speed and direction of rotation of the arm if gear 2 is unable to rotate and gear 6 is driven at 12 revmin in the clockwise direction. This chapter will explore the theory of gear tooth action and the design. In the past ive had luck using this site to create an illustrator file that i can extrude in rhino. Planetary gear trains gears and gear drives jelaska. New design and improvement of planetary gear trains robert handschuh. A carrier connects the centers of the two gears and rotates to carry one gear, called the planet gear or planet pinion, around the other, called the sun gear or sun wheel. The gear train may be either of simple single stage or compound double stage design and the derived formula for each arrangement is as follows.
On completion of this short tutorial you should be able to do the following. The book is addressed to engineers design and industrial application as well. Figure 1 below shows a simplified diagram of a planetary geartrain. The number of planets in a planetary gear train depends on the possibility of housing them in the mechanism, but in order to achieve a more uniform load distribution as a result. Introduction to gear trainsintroduction to gear trains most of the pictures and animations are from norton design of machinery.
A gear can be defined as a toothed wheel which, when meshed with another toothed wheel with similar configura. Introduction to gear design introduction albert einstein once said. This does not generate planetary gears, and im also unclear as to how design a planetary gear with a 2. Some designs use steppedplanet which have two differentlysized gears on either end of a common shaft. Illustrated sourcebook of mechanical components pgs. Equation and calculators to determine ratios of planetary or epicyclic gear assemblies. It is possible to design gear teeth for gears that are noncircular, yet still transmit torque smoothly. The new designs are based on regulating backlash between the gears and. Depends on what level you want to go and what is your background. Introduction special layouts of simple planetary gear trains composed planetary gear trains elements of planetary gear train design list of symbols planetary gear trains gears and gear drives wiley online library. Planetary epicyclic gear ratios equations and calculators. This book is an attempt to apply that principle to gear design by presenting information from a manufacturing pointofview rather than a theoretical one. Choosing which piece plays which role determines the gear ratio for the gearset.
New types of planetary facegear drives the developed facegear drives are shown in figs. A variety of representations have been proposed for this type of model. Design of machinery an introduction to the synthesis and. As more and more of these engineers reach retirement age younger engineers must pick up where they left off, and for many epicyclic gearing is an area where they lack experience. Planetary gear trains 1st edition kiril arnaudov dimitar petkov. As the weigh is 60%, and half the size of a conventional gear box, it is very likely to have a misconception that it is not as strong. Intro planetary gears also refer as epicyclic gearing consisting three elements sun gear, planet gear and ring gear. A carrier connects the centers of the two gears and rotates to carry one gear, called the planet gear or planet pinion, around the other, called the sun gear or. Planetary gear train article about planetary gear train by. Each of these three components can be the input, the output or can be held stationary. Introduction to gear trainsintroduction to gear trains.
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