Complete the gear design part and draw the layout of gears on 27 march, 2017 z 1 z 2 z 3 z 4 important. Note the design surface compressive stress and bending stress for the selected material from design data book or find. Gears can be animated with various speed to demonstrate working mechanism. Chakraborty, department of mechanical engineering, iit kharagpur. Design of the hub of the gear degree of precision required means of attaching the gear to the shaft means of locating the gear axially on the shaft august 15, 2007 11 kalpakjian schmid manufacturing engineering and technology, prentice hall spur gear nomenclature august 15, 2007 12 gear types helical gears teeth are at an angle. Spur gear creation american society for engineering. Egelja university of illinois at chicago, chicago, illinois j. Nptel provides elearning through online web and video courses various streams. Pdf there are two kinds of stresses in gear teeth, root bending stresses and tooth contact stresses. Degrees of freedom is the one of the most important concept in mechanics. Gear wreck will happen because of its tooth fatigue and tooth surface wear, so strength design from both side is necessary.
If the gears are made of cast steel having allowable static strength of 100 mpa. Design of machine members 2 pdf notes dmm 2 notes pdf. The straight line thickness of a gear tooth measured on the pitch circle. Design and optimization of planetary gears considering all. P, affiliated to jntu ananthapur 2 assistant professor, department of mech, svr engineering college,nandhyala, a. We initiated the process with a simpler spur gear, then advanced to the straight bevel gear and finally defined the governing parametric equations for a spiral bevel gear. At the august 2016 meeting of the agma foundation board of trustees, the trustees approved a foundation grant to agma for updating the online detailed gear design beyond simple service factors, advanced engineering course.
In this lecture, first of all we will go through the concept and feature of bevel gears. Direct gear design for spur and helical involute gears. There is no time limit on the quiz, and you can take it multiple times until you pass. Manual of gear design revised combined edition, volumes 1, 2 and 3. Very comprehensive in its coverage, the handbook contains enough tables, illustrative examples and diagrams to enable designers arrive at quick solutions for their problems. Tutorial for gear design and calculation with mdesign gearbox. Yi zhang with susan finger stephannie behrens table of contents. Each of the chapters will deal with aspecific problem which is encountered during the design phases and during operation. We offer a variety of training options such as web based applications, regular, books, and cad cam online training. Shafts are designed on the basis of strength or rigidity or both.
Design based on rigidity is to ensure that maximum deflection because of bending and maximum twist due to torsion of the shaft is within the allowable limits. If the transmission of rotation should occur with a constant ratio, which means that in case of a con. A gear can be defined as a toothed wheel which, when meshed with another toothed wheel with similar configura. Cylindrical spur gears with standard profile cylindrical spur gears with corrected profile without centre distance variation with centre distance variation. Design of machine members 2 pdf notes dmm 2 notes pdf book starts with the topics covering types of journal bearings, types of rolling contact bearings, thrust in connecting i rod, transmission of power by belt and rope drives, load concentration factor, square acme, helical and bevel gears, worm gears properties of worm gears, etc. Design of machinery an introduction to the synthesis and. Preliminary aim is to design a rack and pinion gearbox rpg which has desired steering ratio, zero play in the rpg and sensitive steering.
The gearset shall transmit 100 horsepower at a pinion speed of revolutions per minute. The frame in the middle, where the coordinate system is shown, is the design space of your gearbox. Building on the design centric flow of that program, fairfield is an interactive web application with an enhanced user interface and added features. The kinematic design of gear trains is principally involved with the selection of appropriate ratios and gear diameters. A complete gear train design will necessarily involve considerations of strength of. Determine torque in shafts from gears, pulleys, sprockets, clutches, and couplings. In this lecture, i shall give a brief history of toothed gear invention and development and next something about the gear train, then special sophisticated gearing. Procedure for optimum design of a twostage spur gear system article pdf available in jsme international journal series c 464. This new edition provides extensive information to designers on various aspects of gears and gearing systems. Tech in 2015 from svr engineering college,nandhyala, a. Introduction to gear trainsintroduction to gear trains most of the pictures and animations are from norton design of machinery. Is there any online free courses for machine design subjects. Gear design in mdesign gearbox march 2012 driveconcepts gmbh, dresden in the graphical input you will find different categories.
B maiti, department of mechanical engineering,iit kharagpur. Calculate forces on teeth of spur gears, including impact forces associated with velocity and clearances. Manual of gear design revised combined edition, volumes 1. Design and application of small standardized components data book 757. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. Introduction to involute gear tooth correction and this is the second lecture on involute spur gear tooth correction. Design based on strength is to ensure that stress at any location of the shaft does not exceed the material yield stress. Shaft design objectives compute forces acting on shafts from gears, pulleys, and sprockets. The number of teeth for spur gears is given by where k 1f fll1 for fulld tht th08f tbt th d ldepth teeth, 0. Contact mechanics in gears chalmers publication library.
Gear design national broach and machine division,of lear siegler, inc. They are most useful component of transmission box because the variation is torque of counter shaft and main shaft is depend on the gear ratio. Midhun2 1,2assistant professor 1,2department of mechanical engineering 1,2svs college of engineering, coimbatore abstract one of the most important component in mechanical is gear for the transmission of power with ease and with less friction. I am unaware of any other book which gives such information and at the same. Assembled gearboxes for particular ratios are also stock items. Courtesy of stock drive productssterling instrument. Therefore gear 1 is driver and gear 2 is driven when the motion of the gear drivers in opposite. Stadtfeld introduction the most basic case of a gear train is the transmission of rotation and power between two parallel shafts.
His teaching and research interests are machine design, gear. Topics gear, gear design, gear design handbook collection opensource language english. This is the fundamental technique of designing such gears with involute tooth. Compare combined stresses to suitable allowable stresses. Design of machine elements nptel online videos, courses. Mar 02, 2017 learning a cadcam system can be a test, but with this training option, it is easy. This is a twodimensional case which allows for observation in a plane. Introduction to gear design introduction albert einstein once said. At the same time, expectations for gear reliability are high. Starting with the basic definitions of gears, conjugate motion, and the laws of gearing, learn the tools needed to understand the inter. Al s b it f h d k t h f assembled plan view also submit a freehand sketch of plan view one copy per group. In more details the covering portion will be design of 1st stage pinion and gear, estimation of wear load capacity, estimation of probable dynamic load at tooth. Design, modeling and analysis of helical gear according bending strength using agma and.
The menu on the right is the element explorer, where you can select the required machine elements. Relative characteristics of gear types 1 best 5 worst ratio power speed relative space approx. Free helical gear design ppt to download at shareware junction. Gears are most often used in transmissions to convert an electric motors high speed and low torque to a shafts requirements for low speed high torque. M arc on pitch circle from flank of one tooth to other tooth. Manual of gear design revised combined edition, volumes 1, 2 and 3 horton, holbrook on. In this paper we have designed these components for 5 tonne crane. Army research laboratory handbook on face gear drives. So, first lecture of this module will be on involute straight tooth spur gear design. Gear surfaces coated with boundary additive or antifriction. Maiti, department of mechanical engineering, iit kharagpur.
Next nomenclature and geometry of straight bevel gear, formative number of. Things should be made as simple as possible, but no simpler. Basic gear design pdh continuing education pdh for. Jan 06, 2016 spur gear design by using matlab code 1. Procedure for optimum design of a twostage spur gear system. Buscar buscar understanding degrees of gewr learn engineering. In addition it let you compose full gear layouts with connetcted gears to design multiple gears system with control of the inputoutput ratio and rotation speed. The theoretical foundation of modern direct gear design was developed by dr. Of that reason, follows a demand of developing a computer based tool for analyzing contact mechanics in gears. This type of transmission are used by skoda,toyota, lexus, etc epicyclic gearing planetry gearing. Working depth of a tooth equals the whole depth minus the height of the.
Gears are machine elements that transmit motion by means of successively engaging teeth. Development of plan and elevation of gear reduction unit iii. Detailed gear design online course agma foundation. Rathindranath maiti is at present professor in mechanical engineering department. Find materials for this course in the pages linked along the left.
The direct design approach that is commonly used for most parts of mechanisms and machines for example, cams, linkages, compressor or turbine blades, etc. Find bending moments from gears, pulleys, or sprockets that are transmitting loads to or from other devices. There are no great advances in gear technology described. The gear ratio is the ratio of the driven gear teeth to the driving gear teeth. Heath the boeing company, mesa, arizona prepared under contract ncc3356 national aeronautics and space administration glenn research center march 2000. Rathindranath maiti department of mechanical engineering indian institute of technology, kharagpur lecture 08 design of bevel gear gear and gear unit design theory and practice, we are in module 2 which is design of spur, straight and helical, bevel and one gear. Gear design and analysis kinematics of gear teeth and gear trains. Keith nisbett chapter gearsgeneral prepared by kueiyuan chanyuan chan associate professor of mechanical engineering national cheng kung university. Pdf design, modeling and analysis of helical gear according. Nptel lectures power system protection and switchgear. If the mating gear has more teeth than the pinion, that is, mg ngnp m is more than one, then the smallest number of teeth on.
Gear generator is a tool for creating involute spur gears and download them in svg format. Design of machine elements nptel online videos, courses iit video lectures. Formulas for gear calculation external gears contents. This chapter begins with a comparison of the merits of spiral bevel gears and hypoid gears when employed as the final drive in the automotive gearbox, ix. Components design of hoisting mechanism of 5 tonne eot crane pooran singh dhakar. This chapter will discuss the kinematics of gear tooth theory, gear types, and the kinematic design of gearsets and gear trains of simple, compound, reverted, and epicyclic types. Spur gear design as an exercise in gear selection, a stepbystep procedure will be demonstrated on how to design a gearset pinion and gear for a gearbox that is to be mass produced for a general industrial application. Types of gear train and velocity ratio calculation techminy.
Design and optimization of planetary gears considering all relevant influences tobias schulze gear design process lightweight construction and consideration of available resources result in gearbox designs with high load capacity and power density. Nptel syllabus airplane design aerodynamic web course course outline 1. Manual of gear design, section three 3 helical and spiral gears and a great selection of related books, art and collectibles available now at. In some cases, such as the automotive differential, one input is provided the. Jan 01, 20 planetary gear trains example for the speed reducer shown, the input shaft a is in line with output shaft b. 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. Whole depth or total depth of a gear tooth equals the addendum plus the dedendum. Lecture series on design of machine elements i by prof. Gear design and strength iupital has good strength, durability, wear resistance, and chemical resistance, so can be used to each gear.
Mounting type range capacity range cost required e. Kinematics of machines nptel online videos, courses iit. Contents of power system protection lecture, iit bombay. Relationship between the involute elements determination of base tooth thickness from a known thickness and viceversa. Gears may be classified according to the relative position of the axes of revolution. Some are listed in the bibliography at the end of this chapter. Ancient engineers used the same direct gear design for spur and helical involute gears. Direct gear design for automotive applications rev 2.
Gears of various sizes and styles are readily available from many manufacturers. When the two gear are mating together, they rotating in opposite direction to each other. Lecture notes elements of mechanical design mechanical. Introduction to gear trainsintroduction to gear trains. Spur gear design ratings 14 rim and shaft design 16 design alternatives 19 helical gears 20. Direct gear design is an application driven gear development process with primary. Use is free and fairfields privacy policy is not to monitor or retain user data from the site. Determine allowable force on gear teeth, including the factors necessary due to. Spur gear design and selection objectives apply principles learned in chapter 11 to actual design and selection of spur gear systems. Agma foundation awards grant for update of online detailed gear design course. Vulgakov in his theory of generalized parameters 1. Welcome to this week 6 lecture module 6 design of general purpose industrial helical gear data. Definitions diametral pitch, p nd module m is reciprocal of p dn circular pitch.
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