Epicyclic gear train in epicyclic gear trains, the axes of the shafts on which. Equation and calculators to determine ratios of planetary or epicyclic gear assemblies. How can we calculate holding torque of epicyclic gear train. 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. This method is particularly useful for the synthesis and design of novel automotive planetary transmissions, where very.
Describe three types of epicyclic gear boxes solve gear box ratios. A network theory for variable epicyclic gear trains citation for published version apa. Table 1 comparison of parallel shaft vs epicyclic gear trains. 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. Algebraic method a compound epicyclic gear train internal type consists of two coaxial s 1 and s 2 sun gear a, an arm h, three planetary gears b,c,and e and an annular gear d as shown in fig wheel a has 10 external teeth, b,c and e have 12 external teeth. Alternative method for analysis of complex compound planetary gear train. Example 6 figure shows a compound epicyclic gear train. 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.
When a gear 1 and arm 3 and gear 2 and arm 3 have a common axix. The paper illustrates the application of a systematic technique for thededuction of dynamic equations of epicyclic gear trains. Scribd is the worlds largest social reading and publishing site. In the practical work, resonance and deformation may occur in the planetary gear train, they will affect transmission stability and accuracy, and even. All 34 types can be derived from one general form of the simple planetary gear train. The epicyclic gear train model is taken from bhel, and some of its. Gear train numericals solved and explained, epicyclic gear train numericals solved, gear train tabular method, reverted gear train problems solved, gear tr. Analysis of load distribution in planet gear bearings.
In this lesson, we will study about epicyclic gear trains, planetary gear trains, easy method to solve numerals on epicyclic gear train and holding torque of gears. A planetary gear train is defined as any gear train containing at least one gear that orbits by rotating about its own axis and also about the axis of an arm, or carrier. A basic example is a singlestage gear unit withthree fixedplanets and a rotating carrier know as a star epicyclic gear. In this lecture i have discussed about the numerical problem on simple epicyclic gear train from theory of machines in hindi. 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. Tooth load and torque calculations in epicyclic gear trains. Velocity ratio for epicyclic train velocity ratio of epicyclic gear train is the ratio of the speed of the driver to the speed of the driven or follower. In this simple example of an epicyclic train, the only gear left to take an output. One of the most important considerations for an epicyclic gear is to assure uniform load distribution among the planets. The analysis of planetary gearing often is unwieldy because components. Let me now solve this example of an epicyclic gear train. Velocity ratios of epicyclic gear train the following two methods may be used for finding out the velocity ratio of an epicyclic gear train. Johnson algorithm sequencing of n jobs on 2 machines. Epicyclic drive trains analysis synthesis and applications.
Design, load analysis and optimization of compound epicyclic gear trains syed ibrahim dilawer1. This was mainly intended to help build your intuition for these fascinating systems. A twostage planetary gear stage is defined using the program. A carrier connects the centers of the two gears and rotates to carry one gear, called the planet gear, around the other, called the sun gear. The velocity ratio of an epicyclic gear train is determined by the following methods. Calculate gear ratio by dividing the number of teeth on the driven gear by the number of teeth on the driving gear.
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. We present here a simple, methodical procedure for determining the final gear ratio of an epicyclic gear train. You will now rotate the outer ring gear by that amount to align it correctly with the planet gears. A network theory for variable epicyclic gear trains. These drives receive an unusually clear treatment because at dr. In this video, we have discussed how to tackle questions related to gear train, how to make the necessary table and reach the desired conclusion.
Dynamic analysis of epicyclic gear trains by means of. Management summary in epicyclic gear sets designed for aeronautical applications, planet gears are generally supported by spherical roller bearings with the bearing outer race integral to the gear hub. Calculate the input and outputs speeds and torques of gear. Let, ta number of teeth on gear a, and tb number of teeth on gear b. It will also address the use of epicyclic gear trains as a power coupling in a tandem bike.
Technique for examing epicyclic gear box semantic scholar. The elementary planetary, or epicyclic, gear train is shown in figure 2, along with the simplified representation to be used for the remainder of this thesis. Thus the conventional gear train is simply a special case of the more complex epicyclic train, in which its arm is held stationary. More complex epicyclic trains may be analysed in a similar manner, but the technique is not of much assistance when the problem is one of gear train design the interested designer is referred to the bibliography. Pdf gears in the epicyclic gear trains are one of the most critical components in. Following are the different types of gear trains, depending upon the arrangement of wheels. Abstract this paper presents a method for analyzing epicyclic gearboxes by evaluating the speeds, torques and efficiency of the external elements in epicyclic gear mechanisms, as well as the total ratios of the gear box. Their report presented a method to evaluate the dynamic load increment due to gear.
The tool investigated is from atlas copco st series and consists of three main parts. This is made possible in a 3 or more planet arrangement. Pdf the mechanical efficiency of epicyclic gear trains. Epicyclic gearing systems also incorporate the use of an outer ring gear or annulus, which. Typically, the planet gears are mounted on a movable arm or carrier, which itself may rotate relative to the sun gear. Nptel provides elearning through online web and video courses various streams. The next steps depend on the state of the planetary gears connected to the carrier, although all use the same formula. D rotation of driver per revolution of follower or the driven gear or pulley. Design, modelling and analysis of a 3 stage epicyclic planetary reduction gear unit of a flight vehicle k akhila1 and m amarnath reddy2 corresponding author. Design of machinery an introduction to the synthesis and. The following two methods may be used for finding out velocity ratio of an epicyclic gear train. Thediscussed examples illustrate how the presented approach can be extendedfor. Epicyclic planetary gear system 3d cad model library. The planet and sun gears mesh so that their pitch circles roll without slip.
Pdf design, load analysis and optimization of compound. Calculation of a planetary gear train this tutorial shows the usage of mesys shaft calculation with shaft systems. Tabular method for epicyclic gear trains watch more videos at. This article presents a new method to compute roller load. Unified methods of analysis and synthesis of complex drives are employed throughout, suggesting that further simplifications may be possible through the use of a multivalued logic system which is. Tabular method, epicyclic gear train, assignment help. Velocity ratios of epicyclic gear trainthere are two methods of. Epicyclic gear train solution techniques with application. Application of the element relations to a complete train is carried out as shown in the example which follows. Hi i require to design an epicyclic gear train which has two different inputs and one output at another gear.
Calculation of velocity ratio can be performed by either the formula method or the tabular method. Introduction principles of mechanisms willis, 1841 is widely considered to be the firs put blication dedicated solely to the field now called kinematics, and discusses analytical modeling of an epicyclic gear train for the. The mechanical efficiency of epicyclic gear trains. Design of a sngle epicyclic gear train power flow in a dngle epicyclic gea. We use the method introduced in epicyclic ratio calculation for determining the final gear ratio of an epicyclic gear train. This method is extremely procedural, which is appropriate since use of intuition is often quite. Pdf epicyclic gear train solution techniques with application to. 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. An epicyclic gear train consists of two gears mounted so that the center of one gear revolves around the center of the other. For example, if the sun gear has 20 teeth and the ring gear has 60, the planetary gear has 80 teeth. Planetary epicyclic gear ratios equations and calculators.
Please start with the tutorial for shaft calculation to see how to introduce geometry and supports for single shafts. Once x, and y are known, the revolutions of other elements may be estimated as these are described in x and y in iii row in the table. On the preceding page, i demonstrated a simple, tabular method for calculating speeds in a planetary gearset with one input fixed. In this method a table is completed first as described below. Tabular method assignment help, tabular method homework help, epicyclic gear train tutors.
The use of theproposed method is particularly amenable in conjuction with proceduresfor the computerized enumeration of geared kinematic chains. Note that a zero velocity input to the arm merely makes a conventional train out of the epicyclic train as shown in figure 932a. Planetary gear trains unm mechanical engineering program. The following two methods may be used for finding out the velocity ratio of an epicyclic gear train. R is the angular speed of the arm, equal to the input angular speed. Pdf in his masters thesis for virginia polytechnic institute and state university. Design, load analysis and optimization of compound. Freudenstein i in 1955, gave an appropriate but a numerical method for dimensional synthesis of a four bar linkage.
370 335 832 32 808 548 507 1527 632 114 990 732 410 1443 1362 657 478 1619 469 954 730 828 80 1463 1245 102 489 1267 733 1368 1518 1443 1243 269 300 1523 1106 1056 1477 900 31 85 9 701 523 36 546 903