This lesson tells about basics of planetary gear train. In epicyclic gear trains, the axes of shafts on which the gears are mounted may move relative to a fixed axis. It is a motorized unit consisting of a sun gear mounted on input shaft. Define gear train and explain different types of gear train 25. The 700 series uses a single arm pantograph, which is effective for reducing noise. The gear train consists of five external gears and 4 internal annulus gears, including sun and planet gears forming an epicyclic gear train.
But in case of epicyclic gear trains, the axes of the shafts on which the gears are mounted may move relative to a. In an epicyclic gear train, the internal wheels a, b and the compound wheel c and d rotate independently about the axis o. With the right feedback, you can get your software developer to work for you to provide the most relevant features possible. Apart from this, some objective questions have also been discussed in detail which were asked in previous years in engineering services examination. Yi zhang with susan finger stephannie behrens table of contents. Pdf design, load analysis and optimization of compound. 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 annulus gear has internal teeth and the compound gear is.
A note of maximum speedranges, and the distribution of. Epicyclic gear trains are generally used for automatic transmission, overdrives, and final drives. The total mechanical loss is then given as the sum of losses from all gear meshes and bearings. Internal ringgear, three planets on spiderarm and the sun gear as semipictorial fig. So the absolute speed of a gear is the relative speed with respect to the shaft plus the shafts speed with respect to ground. Please start with the tutorial for shaft calculation to see how to introduce geometry and supports for single shafts. New technologies for railway trains 6 pantograph and an insulator. 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.
Thediscussed examples illustrate how the presented approach can be extendedfor computing the equivalent inertia of an. A gear whose axis itself is revolving is called a planetary gear. Alexander kapelevich akgears gear design consulting. Epicyclic gear train apparatus manufacturer supplier india. 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. For a more involved epicyclic gear train example, please refer to the epicyclic gear train example section. If you use a mac, you have the only tool youll need already built into the macos operating system. The wheels e and f rotate on a pin fixed to the arm g. The gear train in which the axis of shaft on which the gears are mounted may have the relative motion between them. Apr 19, 2015 hi i require to design an epicyclic gear train which has two different inputs and one output at another gear. O e of the prime and biggest use of a planetary gearbox is for. Combine multiple pdf files into one single pdf document. In this paper, a simple algorithm is proposed to confirm the power flow direction and. 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.
Based on the number of degrees of freed om, the epicyclic gear trains can be further categorized as differential and planetary gear trains. Reverted gear train when the axes of the first gear i. It will also address the use of epicyclic gear trains as a power coupling in a tandem bike. Design, load analysis and optimization of compound epicyclic. Nptel syllabus mechanics of textile machinery web course course outline machine elements and drives introduction to drives, selection of drives, primary machine. Also different methods like tabulation and formula methods are discussed which are used to solve the questions based on planetary gear train.
Hi i require to design an epicyclic gear train which has two different inputs and one output at another gear. The worm gear can achieve a higher gear ratio than spur gears of a comparable size. Introduction to gear trainsintroduction to gear trains. Herringbone gear sets, also known as double helical gear drives, are commonly used in transmission systems of marine, aerospace and other industrial equipment.
What is the advantage and disadvantage of a epicyclic gear. Epicyclic gear train nptel pdf in the first three types of gear trains, the axes of the shafts over which the gears are mounted are. 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. O e of the prime and biggest use of a planetary gearbox is for running the armature of a wind turbine. The stationary gear sun gear or ring gear can be referred to as the central gear. Nov 28, 2017 the gear train in which the axis of shaft on which the gears are mounted may have the relative motion between them.
Our pdf merger allows you to quickly combine multiple pdf files into one single pdf document, in just a few clicks. A compound gear train with gears p, q, r and s has number of teeth 20, 40, 15 and 20, respectively. Application of planetary reduction gear in operation of the. The method of the innovative synthesis of the epicyclic gear trains was presented. Epicyclic gear train nptel pdf automatic transmission has not better fuel economy. We use the method introduced in epicyclic ratio calculation for determining the final gear ratio of an epicyclic gear train.
Tabular method, epicyclic gear train, assignment help. Jul 11, 2015 compound epicyclic gear train sun and planet gear. Ordinary gear trains have axes, relative to the frame, for all gears comprising the train. To calculate transmission efficiency, it must confirm the power flow direction in transformation gear train and verify if there is power circulation in closed epicyclical gear train firstly. Epicyclic gear trains have been broadly applied in engineering practice. Transmission efficiency is a principal index for estimating the performance of 2kh closed epicyclical gear trains.
In hindiepicyclic gear train numericalkomtom youtube. A key part of gear design software development is customer feedback. A new method of design of epicyclic gear trains scientific. Gear trains are widely used in all kinds of mechanisms and machines, from can openers to aircraft carriers. They offer numerous advantages over general parallelaxis gear trains i. Dynamic analysis of epicyclic gear trains by means of computer algebra article pdf available in multibody system dynamics 73. It consists of two coaxial shafts s1 and s2, an annulus gear a which is fixed, the compound gear bc, the sun geard and the arm h.
Design of machinery an introduction to the synthesis and. Helical gearing, in which the teeth are cut at an angle with the axis of rotation, was developed after spur gearing and has the advantages that has the smoother action and tends to be trainw fig. The sun gear2 on the input shaft is a 20 teeth external gear. An epicyclic gear trains may consist of a simple,compound or mixed gear. An efficient method of achieving high reduction ratios in minimum space is the use of planetary gearing. The analysis of power circulation and the simplified. The shape and position of the insulator cover for the 700 series have been improved according to data collected from the operation of the shinkansen 500 series. Epicyclic gear train solution techniques with application to. There would be numerous applications of planetary gearbox, but i will anser with the one which im sure about.
Gear train is any combination of gear wheels by which motion is transmitted from one shaft to another shaft. 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. Epicyclic gear train in combing machine motion of detaching roller, combing cycle index, web movement in one cycle of combing. An update on the latest gear design software from several vendors, plus what gear design engineers can expect next. Pdf dynamic analysis of epicyclic gear trains by means of.
In this video solve numerical problem related to epicyclic and sun and planet gear train. Gear train manufacturers, gear train exporters and suppliers. Following are the different types of gear trains, depending upon the arrangement of wheels. In some epicyclic gear trains, we may find two or more planetary gears. The inputand output shaftsare coaxial andthe inputand output 1 torques are assumedto be coaxialwith these shafts. The input gear has 20 teeth and the output gear has 100 teeth. The use of theproposed method is particularly amenable in conjuction with proceduresfor the computerized enumeration of geared kinematic chains. Gear surfaces coated with boundary additive or antifriction.
Once you merge pdfs, you can send them directly to. Pdf merge combine pdf files free tool to merge pdf online. Higher value of t f cause scuffing failure of gears. Planetary gear system could be used to secure higher gear ratio in compact space. A presentation on epicycle gear train linkedin slideshare. The diameter of the gear q is twice that of the gear r. With the rotation of each element of the gear train in hand, the overall gear ratio becomes easy. Gear train it is defined as two or more gears are made to mesh with each epicyclic gear train the axes of the shafts over which the geaar are mounted, may move relative to a fixed axis. Design, load analysis and optimization of compound.
Usually, following two types of lubrication mechanisms are commonly used for gear lubrication. When pinion is the driver, it results in step down drive in which nptl output speed. A worm gear is a gear in which a wheel resembles a screw, with parallel helical teeth, while the other is like a normal spur wheel. This chapter will explore the theory of gear tooth action and. For more videos click on playlist link shown below v kinematics of machinery komtom degree. Had it been easy gear train gear p will make 2 rotations for one rotation of gear s. Once files have been uploaded to our system, change the order of your pdf documents.
Dynamic analysis of epicyclic gear trains by means of. Calculation of a planetary gear train this tutorial shows the usage of mesys shaft calculation with shaft systems. A fixedring epicyclic gear train is required to have an overall ratio of 5. Yes, you can use free aspose merger on any operating system that has a web browser. A twostage planetary gear stage is defined using the program. Thus a gear train is a set or system of gears arranged to transfer rotational torque from one part of a mechanical system to another. All the components are modelled in catia to check the assembly and the. 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.
The annulus gear has internal teeth and the compound gear is carried by the arm and revolves freely on a pin of the arm h. Epicyclic gear train apparatus epicyclic gear train. Mech 314 dynamics of mechanisms april 16, 2011 planetary gear train velocities 1 planetary gears and pitch point gear velocities figure 1. Often gears are treated as pitch cylinder, which roll together without slip as shown in fig. Another class of gear train has wide application, the epicyclic or planetary train. 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.
If the arm is the input and the planet is the output, the overall gear ratio is 31 3. It may be regarded as a set of four rigid bodies because. Epicyclic gear train nptel pdf merge friction losses can be divided into two major categories. Freudenstein i in 1955, gave an appropriate but a numerical method for dimensional synthesis of a four bar linkage. The gear will make 3 rotations on its axis in cw sense. For our gear train project, we originally had several different ideas. Gears q and r are mounted on the same shaft as shown in the figure below. In case there is a third gear there will be 3 trains and then 3 equations. The ring gear 5 is fixed and the gear 2 is rotating at 60 rpn ccw ccwcounterclockwise and cw clockwise. With involute profile of gears, only one contact position experiences pure rolling. An epicyclic gear train is shown schematically in the adjacent figure. A substantial amount of literature is available for planar linkages.
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