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. The epicyclic gear photographed here without its arms consists of two elements. Also different methods like tabulation and formula methods are discussed which are used to solve the questions based on planetary gear train. Introduction to epicyclic gear train working and advantages. Had it been easy gear train gear p will make 2 rotations for one rotation of gear s. A 1dof epicyclic gear train and a twostage planetary gear train are used to illustrate. The first is the center gear, known as the sun gear.
Describe three types of epicyclic gear boxes solve gear box ratios. Scribd is the worlds largest social reading and publishing site. Each one is positioned so the sun gear engages and turns all. Apart from this, some objective questions have also been discussed in detail which were asked in previous years in engineering services examination.
Illustrated below is a typical epicyclic gear train. There would be numerous applications of planetary gearbox, but i will anser with the one which im sure about. Graphical presentation of the electric power consumption. But in case of epicyclic gear trains, the axes of the shafts on which the gears are mounted may move relative to a fixed axis. Two inputs are needed to obtain a predictable output.
Thus we see that in a reverted gear train, the motion of the first gear and the last gear is like. The stationary gear sun gear or ring gear can be referred to as the central gear. A simple epicyclic or planetary gear train is shown the figure. On the embedded kinematic fractionation of epicyclic gear.
In the numerical of simple epicyclic gear train i have found out or calculated. This example shows an epicyclic gear drive with overall ratio of 256. Method for analyzing epicyclic gearboxes springerlink. Let t1 number of teeth on gear 1, r1 pitch circle radius of gear 1, and n1 speed of gear 1 in r. The use of theproposed method is particularly amenable in conjuction with proceduresfor the computerized enumeration of geared kinematic chains. Another class of gear train has wide application, the epicyclic or planetary train.
Predetermining internal power flows of an epicyclic gear train is critical to a successful design, because the internal power flows may yield significant power losses at gear meshes and fail the concept. Gear trains theory of machines engineering reference with. 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. This lesson tells about basics of planetary gear train. Later it will be proved that a variator ihhwork has one input haft. Calculate the input and outputs speeds and torques of gear boxes. In case there is a third gear there will be 3 trains and then 3 equations. With the rotation of each element of the gear train in hand, the overall gear ratio becomes easy. Designing compound epicyclic gear trains for maximum speed at high velocity ratios, machine design, april 4, 1957. This is sometimes referred to as conepulley backgearing because of its use within the cone pulleys of certain types of machine tools. The mechanical efficiency of epicyclic gear trains.
The bevel gears helps to make the very compact epicyclic system, which can be used in high speed reduction with few gears. Find powerpoint presentations and slides using the power of, find free presentations research about gear train ppt. A carrier connects the centres 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. R is the angular speed of the arm, equal to the input angular speed. Typically, the planet gears are mounted on a movable arm or carrier, which itself may rotate relative to the sun gear. The planetary gear set, also known as the epicyclic gear train, is one of the most important and interesting inventions in engineering.
Designing compound epicyclic gear trains for maximum speed at high. 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. Epicyclic gear train in an epicyclic gear train, the axes of the shafts, over which the gears are mounted, may move relative to a fixed axis. Planetary or epicyclic gear train epicyclic gear train. Jan 23, 2015 gears 5 5 epicyclic gear train it is the system of epicyclic gears in which at least one wheel axis itself revolves around another fixed axis.
Jul 18, 2017 a gear train is a combination of gears used to transmit motion from one shaft to another. Gear trains theory of machines engineering reference. Design of machinery an introduction to the synthesis and. The paper illustrates the application of a systematic technique for thededuction of dynamic equations of epicyclic gear trains. This has become an epicyclic train with a sun gear and a planet gear orbiting around the sun, held in orbit by the arm. Each element consists of the three components illustrated below. In this lecture i have discussed about the numerical problem on simple epicyclic gear train from theory of machines in hindi. Notice how the planet gears roll on and revolve about the sun gear. Power flow and efficiency analysis of epicyclic gear. The main applications of epicyclic bevel gear train are humpages speed reduction gear and differential gear of an automobile. 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 epicyclic means one gear revolving upon and around another. Gear c compound epicyclic gear trainsun and planet gear in an epicyclic gear train, as shown in figure, the wheel c is keyed to the shaft b and wheel f is keyed to shaft a. The schematic diagram of the compound epicyclic train in fig. Ring gear i t is a type of gear which looks like a ring and have angular cut teethes at its inner surface,and is placed in outermost position in en epicyclic gearbox, the inner teethes of ring gear is in constant mesh at outer point with the set of planetary gears,it is also known as annular ring. The working of the above gears are mentioned in the below ppt. The planet gear are mounted on a moveable arm carrier. Analysis of an epicyclic gear box is performed to illustrate the proposed method. Introduction to epicyclic gear train working and advantages and disadvantages of the epicyclic gear train. All the components are modelled in catia to check the assembly and the. For a more involved epicyclic gear train example, please refer to the epicyclic gear train example section.
Here wheel a and arm c have a common axis at o1 about which they can rotate. Calculate the holding torque on gear box cases it is assumed that the student is already familiar with the following concepts. The method is based on the equations that describe each epicyclic gear mechanism and rules that assign appropriate codes to the external elements. But in case of epicyclic gear trains, the axes of the shafts on which the gears are mounted may move relative to a.
Types of gear trains simple gear train compound gear train planetary gear train simple gear train the most common of the gear train is. The gear b meshes with gear a and has its axis on the arm at o2, about which the gear b can rotate. Kinematic and dynamic simulation of epicyclic gear trains. The planet gear in figure 23 rotates about a fixed bevel gear at the center of which is the driven shaft. Highspeed epicyclic gears can be built relatively small as the power is distributed over several meshes. The method is based on the concept of fundamental circuit corresponding to a basic epicyclic gear train. Dynamic analysis of epicyclic gear trains by means of. A network theory for variable epicyclic gear trains. Feb 28, 2017 the planetary gear set, also known as the epicyclic gear train, is one of the most important and interesting inventions in engineering. Epicyclic gearing also called as planetary gearing. Compound train an intermediate shaft carries two wheels connected in. The wheels d and e rotate together on a pin fixed to the arm g.
This has become an epicyclic train with a sun gear and a planet gear orbiting around the sun, held. Types of gears classification of gears types of gear trains. Tabular method, epicyclic gear train, assignment help. These are the 4link and 5link planetary gear trains, which are depicted schematically in fig. Gear trains image from simon fraser university image from jtekt torsen na, inc. The following 72 files are in this category, out of 72 total. An epicyclic gear train consists of two gears mounted so that the center of one gear revolves around the center of the other. Compound train an intermediate shaft carries two wheels connected in series.
Epicyclic gear train free download as powerpoint presentation. Sun gear i t is the gear with angular cut teethes and is placed in the middle of the. Thediscussed examples illustrate how the presented approach can be extendedfor computing the equivalent inertia of an. Here is a gearset with a stationary ring gear and three planet gears on a rotating carrier. Link 0 is doubled circled, which means that this link is the ground.
Introduction to gear trainsintroduction to gear trains. Image from blog of haja sherief image from hpi racing image from proquest image from sandia national labs image from piaget image from fortune, apr. Such a gear configuration has useful applications, but the overall gear ratio. An epicyclic train is often suitable when a large torquespeed ratio is required in a compact envelope. Epicyclic gear train the axes of the shafts, over which the gears are mounted, may move relative to a fixed axis. An elementary gear train is composed of 3 parts or nodes. Figure 932b shows the same gearset with link 1now free to rotate as an arm which connects the two gears. Thediscussed examples illustrate how the presented approach can be extendedfor computing the equivalent inertia. Apr 19, 2015 hi i require to design an epicyclic gear train which has two different inputs and one output at another gear. The gear 3 which is now the second driver drives the gear 4 i. A presentation on epicycle gear train linkedin slideshare.
The gear train consists of five external gears and 4 internal annulus gears, including sun and planet gears forming an epicyclic gear train. Pdf the mechanical efficiency of epicyclic gear trains. An epicyclic gear train, the axes of the shaft, over which the gears are mounted, move relative to a fixed axis. View and download powerpoint presentations on gear train ppt. The central gear of one element is an external gear. Sep 18, 2017 hi all online lectures for engineering students.
Gears 5 5 epicyclic gear train it is the system of epicyclic gears in which at least one wheel axis itself revolves around another fixed axis. The number of teeth on wheels c, d, e and f are 35, 65, 32 and 68 respectively. Epicyclic gear trains are powerful when used correctly, but are often misunderstood. 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. Now only the joint 02 is grounded and the system dof 2.
O e of the prime and biggest use of a planetary gearbox is for running the armature of a wind turbine. The gear will make 3 rotations on its axis in cw sense. Epicyclic gearing systems also incorporate the use of an outer ring gear or annulus, which meshes. The method emphasizes how power flows are transmitted through the epicyclic gears, as well as power losses. It is made up of a number of elements which are interconnected to form the train. They are great speed variation mechanisms, and are often. Planetary epicyclic gear ratios equations and calculators. Epicyclic gearset gears 6 an epicyclic gear set has some gear or gears whose center revolves about some point. To define a train, consider that it has always the arm r, a gear of the planet and a main gear. What is epicyclic gearbox main components, working and. 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. A gear train is a combination of gears used to transmit motion from one shaft to another.
Simple gear train compound gear train planetary gear train. Apr 04, 20 epicyclic gear train in an epicyclic gear train, the axes of the shafts, over which the gears are mounted, may move relative to a fixed axis. Dec 05, 2017 an epicyclic gearbox is an automatic type gearbox in which parallel shafts and gears arrangement from manual gear box are replaced with more compact and more reliable sun and planetary type of gears arrangement and also the manual clutch from manual power train is replaced with hydro coupled clutch or torque convertor which in turn made the. Epicyclic gear trains have broad applications in automobile, aerospace, mill, and automation industries, such as. The design involves planet and sun gears as one orbits the other like a planet around the sun. 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. The three identical planets of one element are compounded with joined to those of the second element. Example 6 figure shows a compound epicyclic gear train, gears s1 and s2 being rigidly attached to the shaft q. In the numerical of simple epicyclic gear train i have found out or calculated the speed. This gear turns all the gears around it and is at the very center of the entire gear system. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. Design, load analysis and optimization of compound epicyclic. 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. This results in a low power to weight ratio and, together.
Here is the access download page of epicyclic gear train problems and solutions pdf, click this link to download or read online. Design, load analysis and optimization of compound. This presentation is very useful for the subject theory of machine, topic. Ppt types of gear trains powerpoint presentation, free download. Hi i require to design an epicyclic gear train which has two different inputs and one output at another gear. Epicyclic gear train a small gear at the center called the sun, several medium sized gears called the planets and a large external gear called the ring gear.
1111 932 1036 551 1488 863 248 943 951 963 344 1226 1644 1147 666 973 1386 55 651 1585 1036 236 13 1133 1422 1273 275 152