Pdf design, load analysis and optimization of compound. Epicyclic gear train definition of epicyclic gear train. It will also address the use of epicyclic gear trains as a power coupling in a tandem bike. Zoltan levai received 9 february 1968 abstract both compound and internal or external planet gears are considered as well as the paired planet gears. Dynamic analysis of epicyclic gear trains by means of. Structure and analysis of planetary gear trains prof. Following are the different types of gear trains, depending upon the arrangement of wheels. In case there is a third gear there will be 3 trains and then 3 equations. Please start with the tutorial for shaft calculation to see how to introduce geometry and supports for single shafts.
A presentation on epicycle gear train linkedin slideshare. Velocity ratios of epicyclic gear train tabular method 112320 dr. 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. 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. Freudenstein i in 1955, gave an appropriate but a numerical method for dimensional synthesis of a four bar linkage. Simple compoundgear train n n n n t t t t r nn nn rr rr 26 tttt 16 15 14 15 14 12 23 34 45 56 4 23 4 5. Such a combination is called gear train or train of toothed wheels. Specifically, this thesis will provide a simple solution technique for the general case of a twodegree of freedom 2dof planetary gear train along with new graphical design aids. The reciprocal of the speed ratio or velocity is known as train value. If the sun gear is to have between 10 to 15 teeth, suggest the most appropriate numbers of teeth for each of the constituent gears.
Epicyclic gearing systems also incorporate the use of an outer ring gear or annulus, which. To define a train, consider that it has always the arm r, a gear of the planet and a main gear. R is the angular speed of the arm, equal to the input angular speed. Download limit exceeded you have exceeded your daily download allowance.
Not only the epicyclic gear trains in common uses were obtained, but some new types of epicyclic gear. Kinematic analysis of complex gear mechanisms oatao. Whenever a change in the speed or torque of a rotating device is needed, a gear train or one of its cousins, the belt or chain drive mechanism, will usually be used. Once x, and y are known, the revolutions of other elements may be estimated as these are. Helical gear the teeth on helical gears are cut at an angle to the face of the gear this gradual engagement makes helical gears operate much more smoothly and quietly than spur gears one interesting thing about helical gears is that if the angles of the gear teeth are correct, they can be mounted on perpendicular shafts, adjusting the rotation angle by. Problem no 2 on epicyclic gear train gear trains kinematics of machinery theory of machines duration. Tabular method for epicyclic gear trains watch more videos at. 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. The total number of gears used makes no difference. Let, ta number of teeth on gear a, and tb number of teeth on gear b. Aug 25, 2017 for the love of physics walter lewin may 16, 2011 duration. Example 6 figure shows a compound epicyclic gear train. Thus a gear train is a set or system of gears arranged to.
Epicyclic gear trains have been broadly applied in engineering practice. If each shaft has only one gear it does not matter how many shafts are in the train, it is still simple. Sep 18, 2017 hi all online lectures for engineering students. Design, load analysis and optimization of epicyclic gear. The gear will make 3 rotations on its axis in cw sense. An epicyclic gear train consists of two gears mounted so that the center of one gear revolves. Design, load analysis and optimization of compound epicyclic gear trains. The use of theproposed method is particularly amenable in conjuction with proceduresfor the computerized enumeration of geared kinematic chains. Gear train analysis it is very common to use a gear train following a fractionalhorsepower motor in servo positioning applications.
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 nature of the train used depends upon the velocity ratio required and the relative position of the axes of shafts. Simple gear trains a simple gear train is the term used to describe the arrangement when each of the shafts involved only has one spur gear mounted on it. Gear trains are widely used in all kinds of mechanisms and machines, from can openers to aircraft carriers.
Tabular method consider an epicyclic gear train as shown in fig. 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. The method of the innovative synthesis of the epicyclic gear trains was presented. The following two methods may be used for finding out the velocity ratio of an epicyclic gear train. New method with experimental validation for power transmission process analysis on herringbone gear train system wang feng and xu xing automotive engineering research institute, jiangsu university 2120, zhen jiang, china. List inversions of a four bar chain and explain whit worth quick return motion. Also different methods like tabulation and formula methods are discussed which are used to solve the questions based on planetary gear train. In the practical work, resonance and deformation may occur in the planetary gear train, they will affect transmission stability and accuracy, and even. In this lecture i have discussed about the numerical problem on simple epicyclic gear train from theory of machines in hindi. 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. It is stated that the simple planetary gear train consisting. In this video solve numerical problem related to epicyclic and sun and planet gear train. We use the method introduced in epicyclic ratio calculation for determining the final gear ratio of an epicyclic gear train.
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. In the compound gear bc, gear c meshes with gear d, rotating relative to a around the same axis of a. Epicyclic gear train solution techniques with application. All the components are modelled in catia to check the assembly and the. Gear train numericals solved and explained, epicyclic gear train numericals solved, gear train tabular method, reverted gear train problems. A substantial amount of literature is available for planar linkages. A simple planetary with a single carrier, sun gear, and ring gear can be. Simple gear trains, compound gear trains for large speed reduction, epicyclic gear trains algebraic and tabular methods of finding velocity ratio of epicyclic gear trains. Therefore the axes of both the gears are also fixed relative to each other. Balance shaft and gear train modeling to capture gear.
Im working on a solution to this problem and i would like some advice and help. In this video, we have discussed how to tackle questions related to gear train, how to make the necessary table and reach the desired conclusion. Jul 11, 2015 velocity ratios of epicyclic gear train the following two methods may be used for finding out the velocity ratio of an epicyclic gear train. 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. Their report presented a method to evaluate the dynamic load increment.
Planetary gear system could be used to secure higher gear ratio in compact space. Moreover, the planet gears rotate about a moving axis. Sunyoung 17 failure analysis of a planetary gear train a. Later on completing this table, the given conditions are applied to find out x and y. Introduction to gear trainsintroduction to gear trains. Apart from this, some objective questions have also been discussed in detail which were asked in previous years in engineering services examination. Design, load analysis and optimization of compound epicyclic. 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.
Pdf dynamic analysis of epicyclic gear trains by means of. This text will not deal with the stress analysis aspects of gear design. Apr 04, 20 reverted gear train when the axes of the first gear i. The kinematic chain method 1415 16 is used as the example shown in part 2 in this paper, the angular velocities of the body and each gear are shown in table 1 by the motion analysis of a. The stationary gear sun gear or ring gear can be referred to as the central gear. Jan 17, 2018 problem no 2 on epicyclic gear train gear trains kinematics of machinery theory of machines duration. A network theory for variable epicyclic gear trains citation for published version apa. Gear train is a new gear technology section focusing on training and education in the gear industry.
Tabular method first of all, let us suppose that the arm is fixed. Had it been easy gear train gear p will make 2 rotations for one rotation of gear s. It may be regarded as a set of four rigid bodies because. 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. Design, load analysis and optimization of epicyclic gear trains egt and planet gear trains pgt by using graph theory. The gear b meshes with gear a and has its axis on the arm at o2, about which the gear b can rotate.
This is the same convention as used in automotive transmissions. The method of motion of a planetary gear structure is different from traditional parallel gears. Tabular method, epicyclic gear train, assignment help. Pdf the paper illustrates the application of a systematic technique for thededuction of dynamic equations of epicyclic gear trains.
The angular position of the motor is given by m, while the angular position of the load is given by l. Fang zongde school of mechanical engineering, northwestern polytechnical university 710072, xian, china. For the first installment, weve focused on agmas online and video training programs. Table 1 comparison of parallel shaft vs epicyclic gear trains. In this method a table is completed first as described below. Mech 314 dynamics of mechanisms april 16, 2011 planetary gear train velocities 1 planetary gears and pitch point gear velocities figure 1. Pdf dynamic analysis of epicyclic gear trains by means.
Scribd is the worlds largest social reading and publishing site. What is the advantage and disadvantage of a epicyclic gear. Hi i require to design an epicyclic gear train which has two different inputs and one output at another gear. Gear trains image from simon fraser university image from jtekt torsen na, inc. Helical gear the teeth on helical gears are cut at an angle to the face of the gear this gradual engagement makes helical gears operate much more smoothly and quietly than spur gears one interesting thing about helical gears is that if the angles of the gear teeth are correct, they can be mounted on perpendicular shafts, adjusting the rotation angle by 90 degrees. A knowledge of the e ects of a gear train is important to the control systems designer. Design, load analysis and optimization of compound. A new method of design of epicyclic gear trains scientific. Once x, and y are known, the revolutions of other elements may be estimated as these are described in x and y in iii row in the table.
A fixedring epicyclic gear train is required to have an overall ratio of 5. Design of a sngle epicyclic gear train power flow in a dngle epicyclic gea. Balance shaft and gear train modeling to capture gear rattle. The term power transmission is defined as the move ment of. A twostage planetary gear stage is defined using the program. Consider a motor driving a rotary load through a gear train, as shown in figure 1. The gear train consists of five external gears and 4 internal annulus gears, including sun and planet gears forming an epicyclic gear train. 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 shown in the fig 2 gear a meshes with gear b. Define link, inversion, kinematic pair, kinematic chain, machine 2.
Sort by date 1 design unit evaluating new software from smt januaryfebruary 2007. Small electric motors are usually lowtorque and highspeed and a speedreducing gear train is necessary. Advantages of planetary gear system planetary gear system has lots of advantage as compared to traditional gearboxes 1. Reverted gear train pdf following are the different types of gear trains, depending upon the arrangement of wheels. A complete gear train design will necessarily involve considerations of strength of materials and the complicated stress states to which gear teeth are subjected. A network theory for variable epicyclic gear trains. This chapter will explore the theory of gear tooth action and. Design, load analysis and optimization of compound epicyclic gear trains syed ibrahim dilawer1. The gt gear train model proved to be a quick, simple tool to accurately predict the stabilizing torque required to eliminate gear rattle in the secondorder balancer gear train the gt model is flexible enough such that future enhancements can be added to obtain more accurate results.
Typically, the planet gears are mounted on a movable arm or carrier, which itself may rotate relative to the sun gear. Previous investigators, for the most part, have not considered load variations which normally occur because of the elastic nature of the gear train elements. The gear train consists of five external gears and 4. Types of gear trains asimple gear train bcompound gear. For the love of physics walter lewin may 16, 2011 duration. Calculation of a planetary gear train this tutorial shows the usage of mesys shaft calculation with shaft systems. 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. Planetary gear train with compact structure, small volume, large capacity, large range of transmission and high efficiency, is a kind of advanced gear transmission mechanism. Ordinary gear trains have axes, relative to the frame, for all gears comprising the train. In the numerical of simple epicyclic gear train i have found out or calculated the speed. Algebraic and tabular methods of finding velocity ratio of. The tabular method is com monly used but can involve a lot of calculation, and cannot give the velocities of elements whose rotation.
Epicyclic gear train definition of epicyclic gear train by. Design of machinery an introduction to the synthesis and. Apr 19, 2015 hi i require to design an epicyclic gear train which has two different inputs and one output at another gear. Ordinary gear trains gear trains consist of two or more gears for the purpose of transmitting motion from one axis to another. Internal ringgear, three planets on spiderarm and the sun gear as semipictorial fig. This lesson tells about basics of planetary gear train. A network theory for variable epicyclic gear trains proefschaift.