Epicyclic gear train not in course simple gear train when there is only one gear on each shaft,it is known as simple gear train the gears are represented by their pitch circles. Epicyclic gear train epicyclic means one gear revolving upon and around another. Compound reverted gear train design, by stephen, p. We use the method introduced in epicyclic ratio calculation for determining the final gear ratio of an epicyclic gear train. This project will focus on an overview of a power transmission system design, demonstrating how to. On completion of this short tutorial you should be able to do the following.
A gearbox is to be designed with a compound reverted gear train that transmits 25 horsepower with an input speed of 2500 revmin. When sometimes two or more gears are made to mess with each other to transmit power from one shaft to another such combination is called gear trains. I am a mechanical engineer, with great thirst to learn more, apply more, and work hard more. First, the input and output shafts of a reverted train must be on the same axis in a straight line with one another. Additionally, for the reverted compound gear train, applicability of the solution obtained. A gearbox is to be designed with a compound reverted gear. Pdf minimisation of the overall weight of the reverted and the nonreverted. The train in figure has two gears in between the input and output gears. Following are the different types of gear trains, depending upon the arrangement of wheels. Research program new types of planetary facegear drives. Hes3350 machine design, semester 1, 2012, assignment 1 compound reverted gear train design free download as pdf file.
Reverted gear train engineers gallery electronics project. Reverted gear is use in compound gear train which is a difference between simple gear train and reverted gear train. Engage your students during remote learning with video readalouds. An automotive gear differential is a jointfractionated planetary gear train with two degreesoffreedom. Second, the distance between the centers of the two gears in each pair must be the same. Let t1 number of teeth on gear 1, r1 pitch circle radius of gear 1, and n1 speed of gear 1 in r. Reverted gear train axes of the first gear and the last gear are coaxial 4. The advantage of this gear train is the possibility to obtain a low gear ratio, that is not.
What are some applications of the simple gear trains. 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. For the love of physics walter lewin may 16, 2011 duration. Types of gear train simple, compound, reverted, epicyclic. Compound gear trains are used when large changes in speed or power output. Therefore, it agrees the definition of the compound gear train. Design of machinery an introduction to the synthesis and. A reverted gear train is very similar to a compound gear train. Reverted gear train applications of reverted gear train. Thus we see that in a reverted gear train, the motion of the first gear and the last gear is like.
Solid mechanics tutorial gear systems this work covers elements of the syllabus for the edexcel module 21722p hncd mechanical principles outcome 3. 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. Project title design and fabrication of reverted gear train b. New design and improvement of planetary gear trains nasacr20042101 july 2004 u.
The speed ratio of compound gear train is obtained by multiplying the equations. Get your team aligned with all the tools you need on one secure, reliable video platform. Pdf gear ratios for compound gear trains of minimum weight. The tooth profile of a helical gear is an involute curve from an axial view, or in the plane perpendicular to the axis. Compound reverted gear design project by obadah yaghi on prezi. A gear train is a mechanical system formed by mounting gears on a frame so the teeth of the gears engage gear teeth are designed to ensure the pitch circles of engaging gears roll on each other without slipping, providing a smooth transmission of rotation from one gear to the next. In mech designer, it is easier to add compound geartrains than simple geartrains the image to the left shows a compound gear train.
The gear that is turned by the driver gear is called the driven gear. Reverted gear train is a special case of compound gear train which will be used to transmit power in coaxial shafts and in this lesson we will study it along with a general concept which is of high use in reverted and epicyclic gear trains. Reverted gear train when the axes of the first gear i. Definition and types with pdf saswata baksi refrigeration and airconditioning leave a comment. Works on home computers pc or mac as well as smartphones and tablets. Reverted gear train when the axes of the first driver and the last driven are coaxial, then the gear train is known as reverted gear train. The image to the left shows a schematic of a reverted geartrain. Provides teeth counts from any given overall ratio. I have a design problem that has two predictions that i must make. There is more than one gearpair and two shafts have two gears. A calculator for designing a multistage compound gear train. 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. Reverted gear has two or more rigidly fixed gears of different size and has different number of teeth on the same shaft with same axis of rotation and same angular velocity.
Simple gear train a simple gear train uses two gears. A complete gear train design will necessarily involve considerations of strength of materials and the complicated stress states to which gear teeth are subjected. But stock gears come with certain bore sizes, requiring knowledge of the necessary shaft diameter. The reverted compound gear is widely used in automotive.
Ordinary gear trains have axes, relative to the frame, for all gears comprising the train. Gear ratios for compound gear trains of minimum weight. In a reverted gear train, the motion of the first gear and the last gear is same. The gamebased laboratory for gear train design provides the students with the flexibility to. Reverted gear train are the compound gear train in which both the axis of the driver and the driven shaft are coaxial.
An idler gear does not affect the gear ratio velocity ratio between the driver gear and the driven gear. This paper is about designing a reverted compound gear train for engineering use. 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. The number of shafts and direction of rotation of the input gear determine the direction of rotation of the output gear in a compound gear train. The gear 3 which is now the second driver drives the gear 4 i. What are application of reverted gear train answers. It is a compound gear with, two gearspairs, and a special condition that makes the total number of teeth of the first gearpair equals the number of teeth of the secondgearpair, when the module is the same. There are two major differences between compound and reverted gear trains. Homework statement this is a final hurdle of a long question designing a simple gear train.
In the case of the reverted gear train, the driver and the last gear are coaxial. A compound reverted gear train is to be designed as a speed increaser to provide a total increaseof speed of exactly 45 to 1. Theory of machines epicyclic gear trains bysheetal bansal air29ies2014. Hes3350 machine design, semester 1, 2012, assignment 1. If two gears in mesh eg, a drive gear and a driven gear also constitute a gear train which are called simple gear train and in. Gear trains consist of two or more gears for the purpose of transmitting motion from one axis to another. Mechanical analysis gear trains city, university of london. That is done but now am not sure of my calculations for power in out and torque in and out, so hopefully someone can help. A reverted gear train is shown in figure given below, it should be noted that gear 1 and the gear 4 are mounted on the driver and the driven shaft respectively, whose axes are collinear. Examples of the use of these devices will be presented as well. The reverted gear train is to have a train value o. Bong, faculty of engineering and industrial science, swinburne university of technology sarawak campus. Reverted gear train design free download as pdf file. Ok i have 4 spur gears inline, gear a 100 rpm 80 teeth input motor.
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