Based on the number of degrees of freed om, the epicyclic gear trains can be further categorized as differential and planetary gear trains. Kinematics of machines nptel online videos, courses. Chapter 4 gear trains theory of machine, mechanical. 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. The ring gear 5 is fixed and the gear 2 is rotating at 60 rpn ccw ccwcounterclockwise and cw clockwise. 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. Planetary gear system could be used to secure higher gear ratio in compact space.
An epicyclic train is often suitable when a large torquespeed ratio is required in a compact envelope. Im designing a gear driven mechanism, and i need to size the motor, assuming some frictional loss in the gears, so. Imedashvili received 20 november 1968 abstract the nonlinear differential equations of a mechanical differentialgear system are derived and studied. Pdf dynamic analysis of epicyclic gear trains by means of. Dynamic analysis of epicyclic gear trains by means of. Define gear train and explain different types of gear train 25. In an epicyclic gear train, the internal wheels a, b and the compound wheel c and d rotate independently about the axis o. In absence of lubricant additives and antifriction coating, gears will be subjected to direct friction. Transportation engineering ii transportation engineering ii lecture series on transportation engineering ii by dr.
The first element comprises the external sun gear 1 and planet 2. 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. 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. Higher value of t f cause scuffing failure of gears.
Design, load analysis and optimization of compound epicyclic. Rajat rastogi, department of civil engineering, iit roorkee. Design, load analysis and optimization of compound epicyclic gear trains syed ibrahim dilawer1, md. This chapter will explore the theory of gear tooth action and. With increase in pitch line velocity, lubricant used should be less viscous in order to min. Thediscussed examples illustrate how the presented approach can be extendedfor computing the equivalent inertia of an.
Usually, following two types of lubrication mechanisms are commonly used for gear lubrication. An elementary gear train is composed of 3 parts or nodes. Gear trains are widely used in all kinds of mechanisms and machines, from can openers to aircraft carriers. Tribology is also in virtually every area of engineering and industry aerospace agriculture automotive. Epicyclic gear trains have been broadly applied in engineering practice. They offer numerous advantages over general parallelaxis gear trains i. Kinematics and statics of a coupled epicyclic spurgear train f. This document is highly rated by mechanical engineering students and has been viewed 1950 times. 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. Reverted gear train when the axes of the first gear i. Dynamics of differential geartrain mechanisms sciencedirect. Introduction to gear trainsintroduction to gear trains. So the absolute speed of a gear is the relative speed with respect to the shaft plus the shafts speed with respect to ground. The worm gear can achieve a higher gear ratio than spur gears of a comparable size.
An epicyclic gear train is shown schematically in the adjacent figure. Gears is a positive drive which transmits exact velocity ratio from one shaft to another shaft, gear drive is used when the distance between driver and follower is very less, when two or more gears are made to mesh with each other to transmit power from one shaft to another, the combination is called gear trains. Electrical engineering power system protection nptel. Design of machinery an introduction to the synthesis and. New approach article pdf available january 2005 with 6,040 reads how we measure reads. Design, load analysis and optimization of compound. There would be numerous applications of planetary gearbox, but i will anser with the one which im sure about. Jul 19, 2017 apr 23, 2020 chapter 4 gear trains theory of machine, mechanical engineering mechanical engineering notes edurev is made by best teachers of mechanical engineering. A gear train is known as an normal gear teach if all the rotating shafts are set up on a commonplace stationary frame and a planetary gear educate pgt if some gears not only rotate approximately their very own joint axes, however also.
Nptel textile engineering mechanics of textile machinery. Often gears are treated as pitch cylinder, which roll together without slip as shown in fig. Pdf dynamic analysis of epicyclic gear trains by means. Describe necessity of apparatus and system protection. But in case of epicyclic gear trains, the axes of the shafts on which the gears are mounted may move relative to a. For a more involved epicyclic gear train example, please refer to the epicyclic gear train example section. Kinematics of machines nptel online videos, courses iit. Kinematic and dynamic simulation of epicyclic gear trains. Gears and gear trains study notes for mechanical engineering. Hi i require to design an epicyclic gear train which has two different inputs and one output at another gear. Advantages of planetary gear system planetary gear system has lots of advantage as compared to traditional gearboxes 1. What is the advantage and disadvantage of a epicyclic gear. The sun gear2 on the input shaft is a 20 teeth external gear.
The inputand output shaftsare coaxial andthe inputand output 1 torques are assumedto be coaxialwith these shafts. The gear train consists of five external gears and 4 internal annulus gears, including sun and planet gears forming an epicyclic gear train. Gear trains image from simon fraser university image from jtekt torsen na, inc. Experimental analyses of vibration and noise of faulted. If the arm is the input and the planet is the output, the overall gear ratio is 31 3. A gear train is usually made up of two or more gears. Kinematics and statics of a coupled epicyclic spur gear train f. Ordinary gear trains have axes, relative to the frame, for all gears comprising the train. Free pdf ebooks users guide, manuals, sheets about gear trains nptel pdf download ready for download. 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. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. All the components are modelled in catia to check the assembly and the.
The method of the innovative synthesis of the epicyclic gear trains was presented. The wheels e and f rotate on a pin fixed to the arm g. Epicyclic gear train solution techniques with application to tandem bicycling. Smaller gear is known as pinion and larger mating gear is called gear. 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. Not only the epicyclic gear trains in common uses were obtained, but some new types of epicyclic gear.
Gear trains pdf nptel, gear trains nptel pdf download, gear trains nptel lectures, gear and gear train nptel pdf, gear trains, gear trains theory, gear trains problems, gear trains pdftheory of machine, nptel gear train pdf, gear trains pdftheory of machine for diploma. 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. A gear whose axis itself is revolving is called a planetary gear. Epicyclic gear train solution techniques with application. Apr 04, 20 reverted gear train when the axes of the first gear i. Transportation engineering ii lecture series on transportation engineering ii by dr. With the rotation of each element of the gear train in hand, the overall gear ratio becomes easy. In case there is a third gear there will be 3 trains and then 3 equations. O e of the prime and biggest use of a planetary gearbox is for running the armature of a wind turbine. These gears are usually thought of as high speed gears. Following are the different types of gear trains, depending upon the arrangement of wheels. Gear life depends on effective lubrication, which can be quatified by minimum film trajns to r compositeas shown in fig. Each element consists of the three components illustrated below.
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. Design, load analysis and optimization of epicyclic gear. List of ebooks and manuels about gear trains nptel pdf download. Hypoid gear this is a deviation from a bevel gear that originated as a special development for the automobile industry. 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. The paper illustrates the application of a systematic technique for thededuction of dynamic equations of epicyclic gear trains. Epicyclic gear train nptel pdf automatic transmission has not better fuel economy. Mar 30, 2016 compound epicyclic gear train sun and planet gear. Gears is a positive drive which transmits exact velocity ratio from one shaft to another shaft, gear drive is used when the distance between driver and follower is very less, when two or more gears are made to mesh with each other to transmit power from one shaft to another, the combination is called gear trains gears. Gear trains train of gears widely used on machines to transfer motion from one element to many elements. To find more books about gear trains pdf nptel, you can use related keywords. 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. 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.
Gear surfaces coated with boundary additive or antifriction. 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. Apr 23, 2020 chapter 4 gear trains theory of machine, mechanical engineering mechanical engineering notes edurev is made by best teachers of mechanical engineering. It will also address the use of epicyclic gear trains as a power coupling in a tandem bike. The planets 2 and 3 are compounded together on the common arm axles. A fixedring epicyclic gear train is required to have an overall ratio of 5. Epicyclic gear train nptel pdf merge friction losses can be divided into two major categories. R is the angular speed of the arm, equal to the input angular speed. Kinematics and statics of a coupled epicyclic spurgear train. A gear a mounted on shaft x having 50 teeth drives the gear b having 75 teeth mounted.
Epicyclic gear train solution techniques with application to. Previous years gate questions on gear trains 200820. Discuss evolution of relays from electromechanical to numerical relay. Thediscussed examples illustrate how the presented approach can be extendedfor. 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. Herringbone gear sets, also known as double helical gear drives, are commonly used in transmission systems of marine, aerospace and other industrial equipment. To define a train, consider that it has always the arm r, a gear of the planet and a main gear. 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. In some epicyclic gear trains, we may find two or more planetary gears. Tabular method for epicyclic gear trains tabular method for epicyclic gear trains theory of machines video tutorial theory of machines video tutorials for gate, ies, and other psus exams preparation and to help mechanical engineering students covering. Dynamic analysis of epicyclic gear trains by means of computer algebra article pdf available in multibody system dynamics 73.
Textile engineering mechanics of textile machinery nptel. Tribology 101 introduction to the basics of tribology. It is made up of a number of elements which are interconnected to form the train. 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. The use of theproposed method is particularly amenable in conjuction with proceduresfor the computerized enumeration of geared kinematic chains. Transportation engineering ii nptel online videos, courses.
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