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. Consequently, the dimensions of the sun gear would be onethird of the pinion of a parallel shaft geartrain designed to transmit an equivalent torque. The book reflects not only teaching, but also the practical experience of the authors. Each of these three components can be the input, the output or can be held stationary. Kinematic equivalence of planetary gear transmissions muellers book ref. Since, i am working in the metric unit every dimension will be in mm. Small gear driving large gear under drive under drive happens when carrier is the output under drive increases torque decreases speed large gear driving smaller gear overdrive overdrive happens when the carrier is the input if the carrier is held, the gear set goes to reverse.
The way in which gear teeth are formed and how they mesh is determined by their geometry and kinematics, which is the topic of this book. A typical case would involve the design of the gearing for a hoist to raise a certain weight w ata uniform speed, when making use of a motor with a given horsepower hp running at a given speed rpm and. The epicyclic gear train family in general has a central sun gear which meshes with and is surrounded by planet gears. The information contained in this publication was current at the time of printing and. The book is addressed to engineers design and industrial application as well. Planetary gear trains gears and gear drives wiley online. Traxxas 2388x complete planetary gear differential with steel ring gear.
In the texts chapters, readers can find all the information needed for various types of gear trains, with illustrations and examples. L where a gear a and the arm c have a common axis at o 1 about which they can rotate. Tobias schulze, driveconcepts gmbh dresden conclusion this is a guide for generating a gear model and subsequent recalculation of the kinematics and the single parts with the software mdesign gearbox. For all forward gears, power enters the gear train via the forward annular gear and leaves the gear train by the reverse annular gear.
It was developed under the motto from practice to practice. Planetary gear design a planetary gear system, also referred to as epicyclic gearing, consists of three elements a sun gear, one or more planet gears, and a ring gear. Let in planetary gear unit there are three planet gears, now when we consider the torque transmission capability, we will note it that planetary gear unit torque transmission capacity is 3 times as compared to torque transmission capacity of spur gear unit. Selecting gears in metric unit the gear tooth profile of the spur gear will be in module. Introduction special layouts of simple planetary gear trains composed planetary gear trains elements of planetary gear train design list of symbols. Things should be made as simple as possible, but no simpler. Online shopping from a great selection at books store. Shift rite transmissions replacement for 4l60e rear planet set ring gear sun gear planetary 4l60e shift rite 5. Planetary gear trains is the most comprehensive and uptodate work available in this key technical area.
Planetary gear trains are extensively used for the power transmission and are the most critical component. Spur, helical, bevel, worm and planetary gears are all covered, with consideration given to their classification. Let us consider one spur gear and one planetary gear unit of similar size. Planetary gear design second editionchinese edition. Freelove 9 series gear design pure copper brass fidget spinner edc toy detachable r188 silent stainless steel bearing. Design and application of small standardized components data book 757.
Learn and define the concept of epicyclic gearing is including some basic history and the differences among simple planetary gear systems, compound planetary gear systems and star drive gear systems. The book introduces the design of planetary gear transmissions and provides indepth coverage of a planetary gearbox with 2dof. The gear b meshes with gear a and has its axis on the arm o 2, about which the gear b can rotate. This book is an attempt to apply that principle to gear design by presenting information from a manufacturing pointofview rather than a theoretical one. This book presents a clear and concise description of a multitude of revolving gear trains in terms common to all, whereas previous publications have been limited to treatment on interesting subproblems. Gears and gear drives provides the reader with comprehensive coverage of gears and gear drives. The planet gear in figure 23 rotates about a fixed bevel gear at the center of which is the driven shaft. The reasons why epicyclic gearing is used have been covered in this magazine, so well expand on the topic in just a few places. Planetary gear trains gears and gear drives wiley online library. Chemical industry press book comprehensively and systematically expounded the planetary gear design and miniature planetary gear design two aspects. Xun, chao, jiao, sujuan, chen, yong, and long, xinhua. Christianhartmanngerlach, driveconcepts gmbh dresden dr.
This investigation is primarily concerned with planetary gear drives fig. The planetary gear train arrangement in general has a central sun gear which. Cover concepts on the arrangement of the individual components including the carrier, sun, planet, ring and star gears and the rigid requirements. Planetary gear design second editionchinese edition rao zhen gang on. Choosing which piece plays which role determines the gear ratio for the gearset. Planetary gear ratio calculations this article also available in spanish. 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. Introduction to gear design introduction albert einstein once said.
There are no great advances in gear technology described here. One of the planetary gearsets from our transmission has a ring gear with 72 teeth and a sun gear with 30 teeth. Very comprehensive in its coverage, the handbook contains enough tables, illustrative examples and diagrams to enable designers arrive at quick solutions for their problems. Lightweight design for planetary gear transmissions. Part of the mechanisms and machine science book series mechan. Design and characterization of a new planetary gear box. This book provides comprehensive information for various planetary gear trains, with practical applications and comprehensive references to technical articles. For a planetary arrangement with three planets, each tooth engagement of the sun gear would have to carry one third of the total load. Design, load analysis and optimization of compound. Planetary gear is a widely used industrial product in midlevel precision industry, such as printing lathe, automation assembly, semiconductor equipment and automation system.
Design, load analysis and optimization of compound epicyclic gear trains syed ibrahim dilawer1, md. Planetary gear trains the main problems gathered in a book. To compare with traditional gearbox, planetary gear has several advantages. Planetary designs also cannot have ratios less than 3. Its wellreasoned definitions and classifications will aid engineers in the selection and design of the best drives for any given application. Traxxas 2382 hardenedsteel planetary gears, pins, and shafts. A planetary gear can provide gear reduction underdrive direct drive, overdrive, or reverse when you hold one part stationary, or lock two parts together. Illustrated sourcebook of mechanical components pgs. The planetary gear train consists of two sun gears, two sets of pinion gears three in each set, two sets of annular internal gears and pinion carriers which support the pinion gears on pins.
Before considering a drive system, first become familar with general, gear design principles. There are no great advances in gear technology described. In the past ive had luck using this site to create an illustrator file that i can extrude in rhino. Planetary epicyclic gear ratios equations and calculators. Suggest sae publication ae18, automatic transmission design practices. An electric motor operates the planetary gear train via a belt multiplying the rotational speed of the planetcarrier up to a maximum of 6000 rpm, i.
Powerflowthrough the planetary gear set mathmagically the carrier is the largest gear in the planetary gear set. Everything else in the transmission is there to help the planetary gearset do its thing. Two forms of planetary gears of the bevel type are shown in figures 23 and 24. This does not generate planetary gears, and im also unclear as to how design a planetary gear with a 2. The noload power losses produced by the planetary gear train are determined from direct torque measurements by a strain gauged sensor. Planetary gears, which can supply a lot of speed reduction and torque in a small package, have operating characteristics beyond those of fixedaxis gear trains. Pdf design and experiences of a planetary gear box for adaptive. Epicyclic gearing systems also incorporate the use of an outer ring gear or annulus, which meshes.
A question that i often get is how to work out planetary gears using the gear template generator. A major factor in the design of spur gears is the power. Consequently, the dimensions of the sun gear would be onethird of the pinion of a parallel shaft gear train designed to transmit an equivalent torque. The sun gear is located at the center, and transmits torque to the planet gears that orbit around it. Gears and gear drives wiley online books wiley online library. This selfpaced tutorial is modeled on portions of the book titled inside pro engineer by. The aim of the paper is to present a differential planetary gear box. This new edition provides extensive information to designers on various aspects of gears and gearing systems. A typical case would involve the design of the gearing for a hoist to raise a certain weight w ata uniform speed, when making use of a motor with a given horsepower hp running at a given speed rpm and driving through a pinion with number of teeth np, fig. Working out the tooth counts for planetary gears is actually not that complicated, so i initially neglected to mention how to do it. Tutorial for gear design and calculation with mdesign gearbox. In an epicyclic gear train, the axes of the shafts, over which the gears are mounted, move relative to a fixed axis.
It emphasizes the fundamental mechanical concepts and illustrates the theory with the worked out designs and prototypes. Heello everyone, in this video, we are going to design epicyclic planetary gear driv with motion analysis using solidworks. Tutorial for gear design and calculation with mdesign gearbox dipl. A question that i often get is how to work out planetary gears using the gear template generator working out the tooth counts for planetary gears is actually not that complicated, so i initially neglected to mention how to do it. Planetary is an american comic book series created by writer warren ellis and artist john cassaday, and published by the wildstorm imprint of dc comics. Apr 18, 2018 heello everyone, in this video, we are going to design epicyclic planetary gear driv with motion analysis using solidworks. This publication provides maintenance and service procedures for axletech covered planetary spider design wheel end assemblies. Proceedings of the asme 2018 international design engineering technical conferences and computers and information in engineering conference. Typically, the planet gears are mounted on a movable arm or carrier, which itself may rotate relative to the sun gear. Design and operating principle of a lowbacklash planetary gearbox duration. Planetary gear trains are one of the main subdivisions of the simple epicyclic gear train family. Planetary gearing could increase torque and reduce load inertia while slowdown the speed. Courtesy of stock drive productssterling instrument.
Planetary axle wheel ends covered planetary spider design. The input shaft is the central sun gear 1, and the output. Most mechanism of planetary gear comes with compact design and high reductive gear ratio consisting of sun. The handbook is based on iso specifications and is a unique blend of practical as well as the theoretical. The homotopy analysis for the nonlinear dynamics of planetary gear trains.
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