More complex epicyclic trains may be analysed in a similar manner, but the technique is not of much assistance when the problem is one of gear train design the interested designer is referred to the bibliography. The paper illustrates the application of a systematic technique for thededuction of dynamic equations of epicyclic gear trains. Freudenstein i in 1955, gave an appropriate but a numerical method for dimensional synthesis of a four bar linkage. Im writing a basic gear train simulation, where it is possible for every gear to be attached to a source of torqueangular friction. The objective of the lab is to perform experiments which are related to engineering. Annulus an outer ring with inwardfacing teeth that mesh with the. Power acting on the compound epicyclic gear trains is also varied and graphs are plotted to see the load behavior. A gear train is any collection or set of several gears that are engaged. Velocity ratio of a compound epicyclic gear objective to study the velocity ratios of an epicyclic gear by locking. This type of transmission are used by skoda,toyota, lexus, etc epicyclic gearing planetry gearing. Application of the element relations to a complete train is carried out as shown in the example which follows.
Treat the selected experiments as a realistic industrial assignment. To measure the output torque generated by the epicyclic gear system. Ill also be ignoring the fact that gears alternate sign, just to make the equations a. In comparison with a differential train formed by spiral bevel gears, the meshing and precision will be substantially improved due to separate meshing of two pairs of gears. This was developed as a chart which shows all the favourable conditions for. Advantages and velocity ratio of epicyclic gear train. Automatic gearboxes, however, consist of epicyclic gear trains, activating a. Epicyclic gear train experiment 2229 words bartleby. Thus we see that in a reverted gear train, the motion of the first gear and the last gear is like. It is your job to submit a full report of your findings to an engineering audience. To achieve this function successfully, engineers need a sound technological background together with the ability to communicate well with their. Gear trains theory of machines engineering reference. Analysis of dynamic behavior of multiplestage planetary. Introduction planetary gear trains are one of the main subdivisions of the simple epicyclic gear train family.
Epicyclic gear train dynamics including mesh efficiency article pdf available in international journal of mechanics and control 112. Design of machinery an introduction to the synthesis and. Calculation of a planetary gear train this tutorial shows the usage of mesys shaft calculation with shaft systems. It is a motorized unit consisting of a sun gear mounted on input shaft. Pdf this article summarizes published journal articles on planetary and epicyclic gear dynamics and. Dynamic analysis of epicyclic gear trains by means of computer algebra article pdf available in multibody system dynamics 73. Nov 12, 2012 in gear trains, we assume, unless otherwisespecified, that the modules of the gears are the same. A simple epicyclic gear train consists of a sun gear s in the center, a planet. Mullers discovery of their perfect analogy to the simple epicyclic drive trains. Epicyclic gearing or planetary gearing is a gear system consisting of one or more outer gears, or planet gears, revolving about a central, or sun gear. Subject content is presented in a simple and lucid manner. Mar 30, 2016 epicyclic gear train an epicyclic gear train,the axes of the shafts, over which the gears are mounted, may move relative to a fixed axis.
What is the advantage and disadvantage of a epicyclic gear. Planetary gear system could be used to secure higher gear ratio in compact space. When a gear 1 and arm 3 and gear 2 and arm 3 have a common axix. Technique for examing epicyclic gear box krish gupta, ajay sharma amity university, aset, noida, india abstract this paper presents a method for analyzing epicyclic gearboxes by evaluating the speeds, torques and efficiency of the external elements in epicyclic gear mechanisms, as well as the total ratios of the gear box. All 34 types can be derived from one general form of the simple planetary gear train. Unified methods of analysis and synthesis of complex drives are employed throughout, suggesting that further simplifications may be possible through the use of a multivalued logic system which is. Guidelines in preparation of the lab report in general terms, the role of engineers in society is to translate technological advances into new products. The planet gears are held to a cage or carrier that fixes the planets in orbit relative to each other. Gear train with sun, planet, and ring gears matlab. Pdf epicyclic gear train dynamics including mesh efficiency. Algebraic method a compound epicyclic gear train internal type consists of two coaxial s 1 and s 2 sun gear a, an arm h, three planetary gears b,c,and e and an annular gear d as shown in fig wheel a has 10 external teeth, b,c and e have 12 external teeth. This book is designed to meet the objectives of the synthesis and analysis of gear trains. Hey guys here i have solve this an example of epicyclic gear train in medical in a very simplified form so that you can understand it much better and can apply the same concept to. 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.
In this experiment the gear ratio is initially calculated using the formula involving. Historically, a manual transmission consists of sequences of. Planetary gear trains, nasa glenn research center technical reports. On completion of this short tutorial you should be able to do the following. The gear 3 which is now the second driver drives the gear 4 i. Epicyclic gear train apparatus manufacturer supplier india. Attempts are made to serve this purpose by adopting stepbystep procedures to analyse the epicyclic gear trains. The epicyclic gear train family in general has a central sun gear which meshes with and is surrounded by planet gears. The gear train consists of five external gears and 4 internal annulus gears, including sun and planet gears forming an epicyclic gear train. A new method of design of epicyclic gear trains scientific. The present work on epicyclic gear trains carries out the design of all the gears, shafts, keys and the loads are calculated for individual gears in the epicyclic gear train system. A network theory for variable epicyclic gear trains. Simple train three or more wheels connected in series.
Design, load analysis and optimization of compound. Compound train an intermediate shaft carries two wheels connected in. To define a train, consider that it has always the arm r, a gear of the planet and a main gear. Pdf dynamic analysis of epicyclic gear trains by means. The gear b meshes with gear a and has its axis on the arm at o2, about which the gear b can rotate. This method is extremely methodical, which is appropriate since use of intuition is quite futile with an epicyclic gear train such as the following example. Two inputs are needed to obtain a predictable output. These results are published by nasa in the nasa sti report. We show that the nested and the ravigneaux gear train derive from a unified model, which permits to obtain the formulation of ratio and efficiency. Epicyclical gear train system free download as pdf file.
This method is extremely procedural, which is appropriate since use of intuition is often quite futile when applied to complex gear trains. Structure and analysis of planetary gear trains prof. A network theory for variable epicyclic gear trains citation for published version apa. A multiplestage gear train composed of a twostage planetary gear train and a onestage parallel axis gear is shown in figure 3. Gear train 14 experimental study of speed ratio of an epicyclic gear train 15 balancing of reciprocating masses 16 balancing of rotating masses 17 study the profile and jump phenomenon of cam 18 single rotor system. Technique for examing epicyclic gear box semantic scholar. This type of gearing is normally used in tractors and construction. Planetary gears are common in transmission systems, where they provide high gear ratios in compact geometries. We use the method introduced in epicyclic ratio calculation for determining the final gear ratio of an epicyclic gear train.
In this lesson, we will study about epicyclic gear trains, planetary gear trains, easy method to solve numerals on epicyclic gear train and holding torque of gears. The objective of the lab is to perform experiments which are related to mechanics. Epicyclical gear train system free download as pdf. The schematic of a conventional planetary gear train is shown in fig. The plotted graphs can be used to verify the compound epicyclic gear train model for different favorable conditions. We present here a simple, methodical procedure for determining the final gear ratio of an epicyclic gear train. The use of theproposed meth thediscussed examples illustrate how the presented approach can be extendedfor computing the equivalent inertia of an epicyclic gear train or forthe stability analysis of 2 d. In gear trains, we assume, unless otherwisespecified, that the modules of the gears are the same. In epicyclic gear trains, the axes of shafts on which the gears are mounted may move relative to a fixed axis.
Jul 18, 2017 a gear train is a combination of gears used to transmit motion from one shaft to another. A gear train is a combination of gears used to transmit motion from one shaft to another. Please start with the tutorial for shaft calculation to see how to introduce geometry and supports for single shafts. Let t1 number of teeth on gear 1, r1 pitch circle radius of gear 1, and n1 speed of gear 1 in r. In case there is a third gear there will be 3 trains and then 3 equations. Planetary or epicyclic gear train epicyclic gear train. The outermost gear, the ring gear, meshes with each of the planet gears. Compound gear train in a compound gear train, there can be more than one gear per shaft. Advantages of planetary gear system planetary gear system has lots of advantage as compared to traditional gearboxes 1. Calculate the input and outputs speeds and torques of gear. Epicyclic gear train problems and solutions pdf best of all, they are entirely free to find, use and download, so there is no cost or stress at all. The objective of the lab is to perform experiments which are related to mechanics of machine subject in order to understand the behavior. Planetary gears are an interesting engineering system with rich. Not only the epicyclic gear trains in common uses were obtained, but some new types of epicyclic gear trains that are got difficultly by means of conventional combination method were gained.
This apparatus consists of two standard epicyclic gear trains. 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 derivation for gearing ratios between sun gear, planet carrier and ring gear motions are given in the attached excel file. Another class of gear train has wide application, the epicyclic or planetary train. Epicyclic gear train, output torque, holding torque. Kinematic and dynamic simulation of epicyclic gear trains. Pdf dynamic analysis of epicyclic gear trains by means of. Epicyclic gear train apparatus scientific educational lab. A carrier connected to a drive shaft holds the planet gears.
Solid mechanics tutorial gear systems this work covers elements of the syllabus for the edexcel module 21722p hncd mechanical principles outcome 3. Algebraic method a compound epicyclic gear train internal type consists of two coaxial s 1 and s 2 sun gear a, an arm h, three planetary gears b,c,and e and an annular gear d as shown in fig. Dynamic analysis of epicyclic gear trains by means of. Epicyclic gearing or planetary gearing is a gear system consisting of one or more outer, or planet, gears or pinions, revolving about a central sun gear or sun wheel. Ports c, r, and s represent the shafts connected to the planet gear carrier, ring gear, and sun gear. This is the lowest ratio obtainable with an epicyclic gear train. A substantial amount of literature is available for planar linkages. Velocity ratios and gear trains for the gear train shown below, determine the train value, output speed.
Design of a sngle epicyclic gear train power flow in a dngle epicyclic gea. Jun 11, 2016 here you will find a detailed description and introduction of epicyclic planetry gear train. Epicyclic gear train an epicyclic gear train,the axes of the shafts, over which the gears are mounted, may move relative to a fixed axis. Epicyclic gear train free download as powerpoint presentation. A bench top base plate contains all elements for this experiment. In view of the following comments on technical writing, no guidelines shall be given as to how long or detailed the report should be. Design, load analysis and optimization of compound epicyclic.
Thus the conventional gear train is simply a special case of the more complex epicyclic train, in which its arm is held stationary. The method of the innovative synthesis of the epicyclic gear trains was presented. These drives receive an unusually clear treatment because at dr. In this simple example of an epicyclic train, the only gear left to take an output. Compound train an intermediate shaft carries two wheels connected in series. Low efficiency due to the high gearing power occurring in an epicyclic train is an. It is stated that the simple planetary gear train consisting.
Describe three types of epicyclic gear boxes solve gear box ratios. Gear trains theory of machines engineering reference with. Jun 12, 2016 hey guys here i have solve this an example of epicyclic gear train in medical in a very simplified form so that you can understand it much better and can apply the same concept to every problem. Hi, this is a simple, configurable, epicyclic planetary gear train created in creo parametric 3. We propose hereafter a unified model of epicyclic gear trains, based on a primitive parametric kernel, which contains all usual gear train formulations of any compound gear train. Pdf the paper illustrates the application of a systematic technique for thededuction of dynamic equations of epicyclic gear trains. This block models a gear train with sun, planet, and ring gears. Planet carrier holds one or more peripheral planet gears, same size, meshed with the sun gear. The three basic components of the epicyclic gear are. New design and improvement of planetary gear trains. In the first three types of gear trains, the axes of the shafts over which the gears are mounted are fixed relative to each other.
1035 275 1118 657 1281 1347 958 778 1427 815 1223 721 696 681 788 581 830 919 616 1323 375 492 828 871 226 869 901 568 541 1359 594 483 209 544 1123 1469 851 714 1046 820 1143 1146 1350 106 660 1210 140