Five of the seven topics listed under the heading kinematics of machine belongs to dynamics. These notes are of made easy coaching institute, new delhi. Manual transmission offers the driver more control of the vehicle. The geometry of gears theory of machines engineering. Pressure line is the common normal at the point of contact of mating gears along which the driving tooth exerts force on the driven tooth. Gears and gear trains study notes for mechanical engineering. Kinematics of gears and gear trains it is decided that the topics on dynamics listed above i to v will be covered in the course on dynamics of machines whereas the topic a above will be covered in kinematics of machines course. 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. The motion of helical gears is smoother and quieter than the motion of spur gears. Pdf presenting paper reveals the design, development and manufacturing of gear trains find, read and cite all the research you need on researchgate. If the mating gear has more teeth than the pinion, that is. Thus we see that in a reverted gear train, the motion of the first gear and the last gear is like.
Mechanical gear are used to provide a variable output speed from a constant speed power source or to provide torque increase for a variable speed power source as in an automobile. Gear train, internal and epicyclic gearing infocobuild. Yi zhang with susan finger stephannie behrens table of contents. The rack is a portion of a gear having an infinite pitch diameter and the line of action is tangent to the pinion. Planetary gearboxes are used frequently to match the inertias, lower the motor speed, boost the torque, and at the same time. Gear trains are widely used in all kinds of mechanisms and machines, from can openers to aircraft carriers. Epicyclic gear trains are generally used for automatic transmission, overdrives, and final drives. Detailed course content with modules for video lectures module 1 3 hr. Helical gear step gears have two or more spur gears fastened together and each gear is advanced relative to the adjacent one by a small amount. The gear train in an automobile differential is a common application of gears, but nptell misunderstood by the lay public. The gear 3 which is now the second driver drives the gear 4 i. Nptel mechanical engineering video lecture online study.
Modern engineering systems and products still rely upon static and dynamic principles to make them work. In a set of gears, this is most likely to occur between teeth of the largest gear wheel, acting against those of the smallest pinion. Gear design objectives understand basic principles of gearing. Aug 30, 2018 dear gate aspirants of mechanical engineering branch. Oct 07, 2015 gear ratio is numbers of teeth of larger gear to smaller gear. Jul 19, 2017 the disc with teeth on their periphery is known as gear. Mechanical drives are less costly than competing electrical drives and their control is much simpler. F effort force n, lb f w load force or weight n, lb f r gear wheel inside diameter m, in. Understand gear trains and how to calculate ratios. Two inputs are needed to obtain a predictable output. Compound planetary gear train planetary gear train with more than one arm r14 t1t3. Gear trains nptel pdf 1 how do you identify a planetary gear.
Dynamic analysis of slidercrank mechanism,gear trains, fly. Pdf theory of machines made easy handwritten notes for. The content of this course shall provide the student with the basic concepts of various mechanical systems and exposes the student to a wide range of equipment and their utility in a practical situation. The students completing this course are expected to understand the concepts of forces and its resolution in different planes, resultant of force system, forces acting on a body, their free body diagrams using graphical methods. Mechanical engineering video lectures nptel video lectures. These gears are usually thought of as high speed gears. Saswata completed his diploma in mechanical engineering from i.
Gear trains bicycle gearing calculator gear train transmission. Vineet vijay vineet is a community manager for gate and various other engineering exams at gradeup. A planetary gear train is very much like our own solar system, and thats how it gets its name. Rathindranath maiti, department of mechanical engineering, iit kharagpur. Understand geometry of different gears and their dimensional pro perties. His interests are in the mechanics of discrete and continuous systems. Oct 29, 2019 vineet vijay vineet is a community manager for gate and various other engineering exams at gradeup. Columns and struts, force analysis, free body diagrams, gear trains, kinematic analysis, machine design, strength of materials the excel pages can help to solve engineering problems such as gear train calculation, hydraulic calculation, link and liver. Following are the different types of gear trains, depending upon the arrangement of wheels.
Elements of mechanical engineering notes pdf download b. 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. Since chain drives are positive drives there is no slip, hence the velocity ratio will remain constant chain drives are suitable for small centre distances and can be used generally up to 3 meters but in special. The power rating capacities of these chains cover a wide range of drive load requirements. Introduction, static balancing, dynamic balancing, transferring of a force from one. The excel pages can help to solve engineering problems such as gear train. Gear trains simple, compound and epicyclic gear trains. Jan 17, 2018 unsubscribe from tutorials point india pvt. Nptel material is available for free on nptel website. Provide means of connection and disconnection of engine with rest of power train without shock and smoothly. This text will not deal with the stress analysis aspects of gear design. Enable power transmission at varied angles and varied lengths.
The number of teeth for spur gears is given by where k 1f fll1 for fulld tht th08f tbt th d ldepth teeth, 0. Thanks so much for sharing this article with us and in case you are in need of urgent custom writing and editing services. Theory of machines is an applied science of the relationships between geometry and relative motion of the parts of the machine, and concerns to the forces which. 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. Types of gear train and velocity ratio calculation techminy. The tip of one wheel will undercut the root of a tooth on its mating gear if contact continues outside the common tangent to the base circles. The main disadvantage of the belt drives and the rope drives is that the velocity ratio does not remain constant, but varies on account of slip. Lower and higher pairs, degrees of freedom, various types of mechanisms, their inversions and. Nptel mechanical engineering video lecture online study material. Jul 03, 2019 the gear train in an automobile differential is a common application of gears, but nptell misunderstood by the lay public.
Ii lecture 36 force analysis examples lecture 37 gear kinematics lecture 38 gear trains i lecture 39 gear trains ii lecture 40 gear trains iii. Planetary gear trains pdf planetary gear is one of the epicyclic gear, which is a gear system consisting of. Theory of machines is an applied science of the relationships between geometry and relative motion of the parts of the machine, and concerns to the forces which act on those parts. Dear gate aspirants of mechanical engineering branch. Engineering mechanics pdf 1st year notes pdf download. Provide a varied leverage between the engine and the drive wheels provide means to transfer power in opposite direction. In a planetary train at least one of the gears must revolve around another gear in the gear train.
K l university department of mechanical engineering. Recognize different gearing systems and relative advantages and disadvantages between them. Great information about the different types of gear, i have learned a lot and i am looking forward to visiting this site occasionally to read more mechanical engineering articles. Mechanical engineering lecture notesall semesterfree. Gear ratio is numbers of teeth of larger gear to smaller gear. It require small area during the power transmission and to obtain large speed reduction. Asok kumar mallik department of mechanical engineering iit kanpur. 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. Simple gear train in this type, there is only one gear is mounted on each shaft. Apr 04, 20 unit 7 gear trains, kinematics of machines of vtu syllabus prepared by hareesha n gowda, asst. The shafts of worm gears lie in parallel planes and may be skewed at any angle between zero and a right angle. Design, mechanical engineering, walchand institute of technology, solapur403, maharashtra, india 2professor, mechanical engineering, walchand institute of technology, solapur403, maharashtra, india abstract planetary gear trains are extensively used for the power transmission and are the most critical component.
This video is part of the content developed by nptel, a joint initiative of all iits and iisc. Elements of mechanical engineering pdf download free. Download link is provided and students can download the anna university me6401 kinematics of machinery kom syllabus question bank lecture notes syllabus part a 2 marks with answers part b 16 marks question bank with answer, all the materials are listed below for the students to make use of it and score good maximum marks with our study materials. Introduction to gear trainsintroduction to gear trains.
Mechanical engineering principles aims to broaden the readers knowledge of the basic principles that are fundamental to mechanical engineering design and the operation of mechanical systems. 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. The total mechanical loss is then given as the sum of losses from all gear meshes and bearings. These made easy handwritten notes of theory of machines can be easily downloaded for free below. Flywheels and governors study notes for mechanical engineering. P and now studying btech in the school of mechanical engineering at kiit university the institute of eminence. In gear train, combination of two or gears are used to transmit power. Nptel courses in engineering, science, management, humanities and social sciences. Helical gears can take higher loads than similarly sized spur gears. The gear train maybe for spur gear, helical gear and spiral gear. Gears terminology, fundamental law of gearing, involute profile. I am sharing the made easy institutes pdf handwritten notes for the subject theory of machines for gate on this page.
If a gate2018 qualified candidate wishes to obtain softcopy of gate2018 scorecardadmitcard, the same can be obtained by paying rs. The most commonly used chain for drives is the singlestrand standard series roller chain. Pdf theory of machines made easy handwritten notes for gate. Design of machinery an introduction to the synthesis and.
A gear is a mechanical device that transmits rotary motion by changing the magnitude and line of action of the effort force. Planetary or epicyclic gear train gear train mechanical. Nptel gate courses for mechanical engineering online video. 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. The gear wheel transmitted motion between one shaft to another shaft, so the multiple set of gear transmit motion from single main gear to various revolving parts is known as gear train. Video lesson mechanical engineering theory of machines video lecture training. 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 planetary gear train is a little more complex than other types of gear trains. A mechanical engineer by profession, vineet has a keen interest in guiding the pursuinggraduated engineers for successful careers and believes in illuminating their path through solving their queries. 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. Helical gear can be seen as a stepped gear with an infinite number of steps. Module 14 3 hr interference and undercutting, minimum number of teeth, contact ratio, bevel helical, spiral and worm gears module 15 3 hr gear trains simple, kunematics and epicyclic gear trains.
This chapter will explore the theory of gear tooth action and the design. Five hundred only to the bank account details provided below through neftbank transfer. If you are not able to download lectures due to bandwidth constraints, you can obtain the courses in dvds by paying a nominal fee to cover the cost of storage media and distribution. Multiplestrand roller chains are used to provide increased power capacity without the need for increasing the chain pitch or its linear speed. Compound gear train in this type, two or more gears are. The smallest number of teeth on a spur pinion and gear, onetoone gear ratio, which can exist without interference is np.
The disc with teeth on their periphery is known as gear. Module 14 3 hr interference and undercutting, minimum number of teeth, contact ratio, bevel helical, spiral and worm gears module 15 3 hr gear trains simple, compound and epicyclic gear trains. Anirvan dasgupta is a faculty in mechanical engineering at iit kharagpur since 1999. 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. Tooth load and torque calculations in epicyclic gear trains. He has extensively taught courses at undergraduate and postgraduate levels like mechanics, kinematics of machines, dynamics, dynamics of machines, vibration analysis. The gear train is classified into following types, simple gear train compound gear train riveted gear train epicyclic gear train 1.
Pressure angle is the angle between the pressure line and common tangent to pitch circles. Gate mechanical engineering theory of machines video lecture. Mar 29, 2020 epicyclic gear train nptel pdf merge sijthre. This is because automatic transmission has not better mechanical and gear train efficiency as compare to those of automatic transmission. In normal atmospheric conditions, all engineering metallic surfaces are primarily coated with some adsorbed. Made easy handwritten class notes pdf mechanical engineering this is mechanical engineering me study material for gate ies psus exam preparation in the form of handwritten notes. Mechanical engineering lecture notesall semesterfree download. Pdf me6401 kinematics of machinery kom books, lecture. When more than one gear is arranged together for transmitting torque or power from one system to another system then the arrangement is called a gear train. Enable speed reduction between engine and the drive wheels in.
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