A simple method for calculating planetary gear ratios is described which can be used to determine quickly the potential usefulness of any planetary configurations. 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. The second type uses the planetary gear trains as the basic topological unit. The outermost gear, the ring gear, meshes with each of the 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. New design and improvement of planetary gear trains. Planetary epicyclic gear ratios equations and calculators. 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. Sun gear is located at the center that transmits torque to planet gears orbiting around the sun gear. The noload power losses produced by the planetary gear train are determined from direct torque measurements by. Planetary gear trains gears and gear drives wiley online library. This does not generate planetary gears, and im also unclear as to how design a planetary gear with a 2. Design, load analysis and optimization of compound epicyclic. The book reflects not only teaching, but also the practical experience of the authors.
The noload power losses produced by the planetary gear train are determined from direct torque measurements by a strain gauged sensor. 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. New types of planetary face gear drives the developed face gear drives are shown in figs. Heello everyone, in this video, we are going to design epicyclic planetary gear driv with motion analysis using solidworks. The time to find this answer is at the design stage not when it adds a complication at assembly. Some designs use steppedplanet which have two differentlysized gears on either end of a common shaft. Planetary gear trains 1st edition kiril arnaudov dimitar petkov. 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. One of the planetary gearsets from our transmission has a ring gear with 72 teeth and a sun gear with 30 teeth. Traxxas 2388x complete planetary gear differential with steel ring gear.
In the texts chapters, readers can find all the information needed for various types of gear trains, with illustrations and examples. This book provides comprehensive information for various planetary gear trains, with practical applications and. 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. The authors help gear designers to creatively understand the design of gears, as well as master the mechanical calculations needed. How to i design a planetary gear with a gear ratio of 2. Each of these three components can be the input, the output or can be held stationary. Introduction to gear trainsintroduction to gear trains.
A complete gear train design will necessarily involve considerations of strength of. 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. In an epicyclic gear train, the axis of at least one of the gears also moves. 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. Design and characterization of a new planetary gear box.
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. Its wellreasoned definitions and classifications will aid engineers in the selection and design of the best drives for any given application. Planetary gear train article about planetary gear train by. Planetary gear ratio calculations this article also available in spanish. 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. Equation and calculators to determine ratios of planetary or epicyclic gear assemblies. Illustrated sourcebook of mechanical components pgs. Planetary gear trains are one of the main subdivisions of the simple epicyclic gear train family. The research program covers basic ideas of the design of the proposed gear drives. In the reverted planetary train illustrated, find the. 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. Apr 18, 2018 heello everyone, in this video, we are going to design epicyclic planetary gear driv with motion analysis using solidworks. 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. N is used here to mention the number of planet gears in planetary gear unit.
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. It is possible to design gear teeth for gears that are noncircular, yet still transmit torque smoothly. 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. Join the grabcad community today to gain access and download. The epicyclic gear train family in general has a central sun gear which meshes with and is surrounded by planet gears. Planetary gears planetary gear trains are one of the main subdivisions of the simple epicyclic gear train family. Introduction to gear trainsintroduction to gear trains most of the pictures and animations are from norton design of machinery. Thus the loads have to be minimum to reduce the stresses in the gear train. Figure 1 below shows a simplified diagram of a planetary geartrain. Solid mechanics tutorial gear systems this work covers elements of the syllabus for the edexcel module 21722p hncd mechanical principles outcome 3. In the past ive had luck using this site to create an illustrator file that i can extrude in rhino. 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. Lightweight design for planetary gear transmissions. Intro planetary gears also refer as epicyclic gearing consisting three elements sun gear, planet gear and ring gear. There are no great advances in gear technology described. Planetary gear trains gears and gear drives wiley online. Planetary gear trains kiril arnaudov, dimitar petkov karaivanov on amazon. This chapter will explore the theory of gear tooth action and the design. The grabcad library offers millions of free cad designs, cad files, and 3d models. On completion of this short tutorial you should be able to do the following. Oct 06, 2014 depends on what level you want to go and what is your background.
Each planetary gear train only contains three basic links. H the operation and kinematic analysis of a novel cambased infinitely variable transmission. The book is addressed to engineers design and industrial application as well. A gear can be defined as a toothed wheel which, when meshed with another toothed wheel with similar configura. Choosing which piece plays which role determines the gear ratio for the gearset. Planetary gear trains gears and gear drives jelaska. 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.
Planetary gear trains is the most comprehensive and uptodate work available in this key technical area. The epicyclic gear train model is taken from bhel, and some of its parameters have been. Planetary gear trains the main problems gathered in a book. Things should be made as simple as possible, but no simpler.
Depends on what level you want to go and what is your background. An epicyclic gear train consists of two gears mounted so that the center of one gear revolves. Kiril borisov arnaudov is a leading expert in the area of gear design. New design and improvement of planetary gear trains robert handschuh. A gear train hav ing a relative motion of axes is called planetary or an epicyclic gear train. 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. A complete gear train design will necessarily involve considerations of strength of materials and the complicated stress states to which gear teeth are subjected. Design, load analysis and optimization of compound. This book is an attempt to apply that principle to gear design by presenting information from a manufacturing pointofview rather than a theoretical one. Genetic approach for multiobjective optimization of epicyclical gear.
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. Design of machinery an introduction to the synthesis and. In the texts chapters, readers can find all the information needed for various types of. New types of planetary facegear drives the developed facegear drives are shown in figs. Introduction to gear design introduction albert einstein once said. 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. Usually the analysis is made considering constant torques applied to the input member. This book provides comprehensive information for various planetary gear trains, with practical applications and comprehensive references to technical articles. The new designs are based on regulating backlash between the gears and. This text will not deal with the stress analysis aspects of gear design. 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.
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. Just gears itself can be a career that may need 56 lifetimes to fully grasp all aspects of engineering. The authors help gear designers to creatively understand the design of gears. The usefulness of planetary gear trains and the engineering techniques necessary for optimum design are discussed in this paper. The ratio of the pitch circles of mating gears defines the speed ratio and the mechanical advantage of the gear set. Recent articles in gear solutions have discussed epicyclic gearing, but often in the context of experienced engineers. A variety of representations have been proposed for this type of model.
Gear design national broach and machine division,of lear siegler, inc. Research laboratory new design and improvement of planetary. This book provides comprehensive information for various planetary gear trains, with. A planetary gear train provides high gear reduction in a compact package. The planets usually mesh with sun, or central, gears that rotate about the shaft of the mechanism or are fixed. Working out the tooth counts for planetary gears is actually not that complicated, so i initially neglected to mention how to do it. A question that i often get is how to work out planetary gears using the gear template generator. An approach for the kinematic design of threespeed gear mechanisms for electric bicycles.