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. Simple gear train compound gear train planetary gear train. Planetary gear system could be used to secure higher gear ratio in compact space. Epicyclic gear train definition of epicyclic gear train. The teeth of this type can be spur, helical or herringbone. We use the method introduced in epicyclic ratio calculation for determining the final gear ratio of an epicyclic gear train. Gears 5 5 epicyclic gear train it is the system of epicyclic gears in which at least one wheel axis itself revolves around another fixed axis. Epicyclic gear train in an epicyclic gear train, the axes of the shafts, over which the gears are mounted, may move relative to a fixed axis. In an epicyclic or planetary gear train, several spur gears distributed evenly around the circumference run between a gear with internal teeth and a gear with external teeth on a concentric orbit. Kinematic and dynamic simulation of epicyclic gear trains. The conventional gear trains described in the previous sections are all onedegreeoffree. Ppt gear trains powerpoint presentation free to view. Such trains are known as planetary or epicyclic gear trains. What is the degree of freedom in epicyclic gear train.
Winner of the standing ovation award for best powerpoint templates from presentations magazine. For large velocities, compound arrangement is preferred. Planetary or epicyclic gear train epicyclic gear train. In order to achieve the above objective, methodology of design used is explained in next point. An elementary gear train is composed of 3 parts or nodes. Advantages and velocity ratio of epicyclic gear train. The following 72 files are in this category, out of 72 total. When two or more gears are made to mesh with each other to transmit power from one shaft to another, such a combination is called gear train or train of toothed wheels. Mathematics a circle whose circumference rolls along the circumference of a fixed. Epicyclic gearing systems also incorporate the use of an outer ring gear or annulus, which meshes. A gear train is a combination of gears used to transmit motion from one shaft to another. Epicyclic gear train with bevel gear the bevel gears are used to make a more compact epicyclic system and they permit a very high speed reduction with few gears. 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.
Epicyclic gear train noun the noun epicyclic gear train has 1 sense 1. In this train, the blue gear has six times the diameter of the yellow gear. The bevel gears helps to make the very compact epicyclic system, which can be used in high speed reduction with few gears. Epicyclic gear train free download as powerpoint presentation. Introduction to epicyclic gear train working and advantages and disadvantages of the epicyclic gear train. The derivation for gearing ratios between sun gear, planet carrier and ring gear motions are given in the attached excel file. The main applications of epicyclic bevel gear train are humpages speed. Ppt types of gear trains powerpoint presentation, free download. Epicyclic gear train an epicyclic gear train,the axes of the shafts, over which the gears are mounted, may move relative to a fixed axis. Epicyclic gear train gear machines free 30day trial. In ptolemaic cosmology, a small circle, the center of which moves on the circumference of a larger circle at whose center is the earth and the circumference of which describes the orbit of one of the planets around the earth. A presentation on epicycle gear train linkedin slideshare. The epicyclic gear train with bevel gears is used in 1.
A combination of epicyclic gears, usually connected by an arm, in which some or all of the gears have a motion compounded of rotation about an axis and a translation or revolution of that axis. Epicyclic gearset gears 6 an epicyclic gear set has some gear or gears whose center revolves about some point. The working of the above gears are mentioned in the below ppt. Govindaraju,ssec 30 epicyclic gear train basic theory the diagram shows a gear b on the end of an arm. Advantages of planetary gear system planetary gear system has lots of advantage as compared to traditional gearboxes 1. Epicyclic gear train it is the system of epicyclic gears in which at least one wheel axis itself revolves around another fixed axis. Epicyclic definition of epicyclic by the free dictionary.
Typically, the planet gears are mounted on a movable arm or carrier, which itself may rotate relative to the sun gear. Ppt gear powerpoint presentation free to download id. Smallest spur pinion that is interferencefree with a rack is. Notice how the planet gears roll on and revolve about the sun gear. The circulation of the spur gear takes place in analogy to the orbiting of the planets in the solar system. Pdf the mechanical efficiency of epicyclic gear trains. On spur and gear with onetoone gear ratio, smallest number of teeth which will not. As the gear turns, it slides the rack either to the right or left.
Illustrated below is a typical epicyclic gear train. Epicycle gear trains are useful to transmit very high velocity ratios with gear of smaller. What is the advantage and disadvantage of a epicyclic gear. Following are the different types of gear trains, depending upon the arrangement of wheels. But in case of epicyclic gear trains, the axes of the shafts on which the gears are mounted may move relative to a. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. The rack slides right or left, when the gear turns, depending on the way. Hi, this is a simple, configurable, epicyclic planetary gear train created in creo parametric 3.
Gear trains free download as powerpoint presentation. The mechanical efficiency of epicyclic gear trains. The gear b meshes with gear a and has its axis on the arm at o2, about which the gear b can rotate. 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. Epicyclic gearing or planetary gearing is a gear system consisting of one or more outer, or planet, gears or pinions, revolving about a central sun gear or sun wheel. The earliest known reference to gear trains is in a treatise by hero of. But in case of epicyclic gear trains, the axes of the shafts on which the gears are mounted may move relative to a fixed axis. Epicyclic gear train solution techniques with application. The name epicyclic is derived from the curve traced. Types of gear trains simple gear train compound gear train planetary gear train simple gear train the most common of the gear train is. Table 1 comparison of parallel shaft vs epicyclic gear trains. Two cases 1 dof when the sun is constant and planet is roatating as well as revolving around sun and arm rotating.
Epicyclic gear trains are powerful when used correctly, but are often misunderstood. R is the angular speed of the arm, equal to the input angular speed. For the love of physics walter lewin may 16, 2011 duration. Planetary gear drive of high reduction ratios, clutches, etc. An epicyclic gear train consists of two gears mounted so that the center of one gear revolves around the center of the other. Epicyclic means one gear revolving upon and around another. Ppt gear trains powerpoint presentation free to view id. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. Simple gear train compound gear train reverted gear train epicyclic gear train 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.
Here is a gearset with a stationary ring gear and three planet gears on a rotating carrier. Epicyclic train article about epicyclic train by the. Gears are compact, positiveengagement, power transmission elements capable of changing the. Another class of gear train has wide application, the epicyclic or planetary train.
Design, load analysis and optimization of compound. The main applications of epicyclic bevel gear train are humpages speed reduction gear and differential gear of an automobile. Gear trains theory of machines engineering reference. Epicyclic gearing also called as planetary gearing. Example 6 figure shows a compound epicyclic gear train, gears s1 and s2 being rigidly attached to the shaft q. A gear train is a set or system of gears arranged to transfer rotational torque from one part of a mechanical system to another, with some gear ratio performing a mechanical advantage epicyclic gearing or planetary gearing is a gear system consisting of one or more outer gears, or planet gears, revolving about a central, or sun gear key facts. Design of machinery an introduction to the synthesis and. 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. University, entitled epicyclic gear train solution techniques with application to tandem bicycli ng1, christopher corey has presented a complete design and anal ysis technique for epcyclic gear. The gear train consists of five external gears and 4 internal annulus gears, including sun and planet gears forming an epicyclic gear train. 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. Types of gear trains simple gear train compound gear train planetary gear trainsimple gear train the most common of the gear train is the gear pair connecting parallel shafts.
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