Epicyclic gearbox design pdf

Technique for examing epicyclic gear box krish gupta, ajay sharma amity university, aset, noida, india 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. Pdf design and analysis of an epicyclic gearbox for an electric. Most mechanism of planetary gear comes with compact design and high reductive gear ratio consisting of sun. Planetary gear is one of the epicyclic gear, which is a gear system consisting of one or more outer gears, or planet gears, revolving about a central, or sun gear.

This investigationisprimarily concerned with planetary gear drives fig. It focuses on stresses and tries to have a gearbox as compact as possible. Fatigue analysis of carrier for epicyclic gear box is carried out because of the epicyclic gear box is subjected to high torque therefore. In this present study the carrier is used as the present study. Epicyclic definition of epicyclic by the free dictionary. We use the method introduced in epicyclic ratio calculation for determining the final gear ratio of an epicyclic gear train. Recent articles in gear solutions have discussed epicyclic gearing, but often in the context of experienced engineers. With recent epicyclic designs, it has been possible to combine the gearbox and the pump by mounting the impeller on the low speed output shaft of the gear unit fig 4. The design of the gear teeth also affects the relative position of one gear to another. In an epicyclic or planetary gear train, several spur gears distributed evenly around the circumference run between a gear with internal teeth and a. Sun gear i t is the gear with angular cut teethes and is placed in the middle of the.

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. Components, working principle, advantages, disadvantages, and applications pdf by mohammed shafi may 2, 2020 may 8, 2020 epicyclic gearbox is also known as planetary gearbox or planetary gear train or epicyclic gear train. Procedure for complete planetary gearboxes with torque. Course outline pdf registration form pdf education brochure pdf course description 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. Dec 05, 2017 an epicyclic gearbox is an automatic type gearbox in which parallel shafts and gears arrangement from manual gear box are replaced with more compact and more reliable sun and planetary type of gears arrangement and also the manual clutch from manual power train is replaced with hydro coupled clutch or torque convertor which in turn made the. A twostage planetary gear stage is defined using the program. Maag had built both single helical and spur epicyclic hardened and ground gears. Allterrain vehicles atvs are used to handle a wider variety of terrains and are specifically used in border patrol, oil exploration and surveying. Design and fatigue analysis of epicyclic gearbox carrier. Generally, these are called planetary, star, and solar arrangements. 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.

Ring gear i t is a type of gear which looks like a ring and have angular cut teethes at its inner surface,and is placed in outermost position in en epicyclic gearbox, the inner teethes of ring gear is in constant mesh at outer point with the set of planetary gears,it is also known as annular ring. Conceptual design of planetary gearbox system for constant. For epicyclic gearing, manufacturers have developed a specific analysis procedure that breaks the gear transmission down into a number of discrete shaft lines. As more and more of these engineers reach retirement age younger engineers must pick up where they left off, and for many epicyclic gearing is an area where they lack experience. Design, load analysis and optimization of compound epicyclic gear trains syed ibrahim dilawer1, md. Pdf design, load analysis and optimization of compound.

Efficiency analysis of a planetary gearbox diva portal. Sep 25, 2016 the function and design of epicyclic gearing or planetary gearing is demonstrated in this animation of a planetary gearbox. The design also affects the friction present in the transfer. Intro planetary gears also refer as epicyclic gearing consisting three elements sun.

A detailed overview of the selected epicyclic transmission technology is provided and how the use of the fundamental configuration was able to provide advantages over more traditional arrangements when combined with some application specific design features. Design, load analysis and optimization of compound epicyclic. Typically, the planet gears are mounted on a movable arm or carrier, which itself may rotate relative to the sun gear. The reliance catalogue gearbox range includes planetary, bevel and hypoid gearboxes, which provide housed, modular solutions, as well as an epicyclic gear module, which can be used in single or multiple stacks to build a customised gearbox.

Planetary gear is a widely used industrial product in midlevel precision industry, such as printing lathe, automation assembly, semiconductor equipment and automation system. Epicyclic gearbox, 7mm input bore, 12mm output shaft, 6. The three basic components of the epicyclic gear are. I which have a fixed annulus with the planet carrier rotating in the same direction as the sun gear. A reliability tool is presented and tested on the different gearboxes.

Jan 23, 2015 here is a picture of a typical gear box. The input parameters selected for analysis is force, pressure, load. In this study, an epicyclic gearbox has been designed, analysed and manufactured for its use in an. L where a gear a and the arm c have a common axis at o 1 about which they can rotate. Large speed reductions are possible with eppicyclic gears and if the fixed wheel is annular, a more compact unit could. Worm gears convert the motion through 90o and so on. This tool offers a simple way to perform an objective. 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.

Since wt gearbox is a mature technology, the design process tends to be iterative, but from the viewpoint of categorising the design process, we can discuss a generic design life cycle as shown in fig. Design and analysis of an epicyclic gearbox for an electric. Iif the calculated result is negative, the driver and follower will rotate in opposite directions. A schematic of the planetary gearbox under study is shown in figure 1 18. Calculation of a planetary gear train this tutorial shows the usage of mesys shaft calculation with shaft systems. The speed of point b will be higher than the speed of point a compared to the previous case this is because the radius of the ring gear is larger than the radius of the sun gear. This arrangement eliminates the need for one journal bearing, which in turn reduces the overall height of the pumpset leading to a more compact. At the same time, expectations for gear reliability are high. Planetary epicyclic gear ratios equations and calculators. In an epicyclic gear train, the axes of the shafts, over which the gears are mounted, move relative to a fixed axis. Sun gear is located at the center that transmits torque to planet gears orbiting around the sun gear. Planetary gearboxes generally have single or twogear stages for reduction ratios ranging from 3. The gear ratio in an epicyclic gearing system can be different by the design of the gear teeth and the ways of input rotation to the gear. Lightweight design for planetary gear transmissions berndrobert hohn, karsten stahl and philipp gwinner there is a great need for future powertrains in automotive and industrial applications to improve upon their efficiency and power density while reducing their dynamic vibration and noise initiation.

For example bevelled gears allow the axis of one gear to be inclined to the axis of another. It has been said that deriving the formulas for the ratios between the various gears of an epicyclic planetary gear system is nonintuitive and taxes the human intellect to say the least. Calculate the number if teeth required in the ring gear for the ratio 5. Subscribe to our youtube channel to see models built by londons meccano enthusiasts, plus occasional coverage of meccano events elsewhere in the uk. A question that i often get is how to work out planetary gears using the gear template generator. Lightweight design for planetary gear transmissions. Design, load analysis and optimization of compound. 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 epicyclic gear train working and advantages. Specific address will be provided to the tooth design principles applied, bearing. Two basic gear layout arrangements have dominated wtgs gearbox applications.

Design validation of high speed ratio epicyclic gear. The exploded view shows the components of the gearbox that will be explained in. The procedure for the design was an iterative process to. Pdf design and fatigue analysis of epicyclic gearbox. In all cases, if d is known, f 1 d, or, if f is known, d 1 f. Maag determined that there are significant advantages in the use of spur gears in an epicyclic gear for driving a generator. Pdf this paper focusses on the designing and optimizing of a planetary gearbox for an fsae formula electric car. The simple planetary gearbox comprises of the coaxial sun gear, planet carrier and outer gear subassemblies, and is combined with the planet gears rotating at.

To compare with traditional gearbox, planetary gear has several advantages. Design and optimization of planetary gears considering all. Epicyclic gearing is the basis of a planetary gearbox design. Mathematics a circle whose circumference rolls along the circumference of a fixed. Comparing cycloidal and planetary gearboxes machine design. Experimental characterization of the coupling stage of a. Internet searches for how to proved fruitless and dare i say information is being withheld, so this programmer set out to demystify the methods for. 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. Conceptual design of planetary gearbox system for constant generator speed in hydro power plant. Working out the tooth counts for planetary gears is actually not that complicated, so i initially neglected to mention how to do it. Please start with the tutorial for shaft calculation to see how to introduce geometry and supports for single shafts. Upon completion of the project, team 6 critiqued their design and.

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. Coaxial gearboxes may be either of the multilayshaft or epicyclic designs. Stresses are determined with the bs iso 6336 method and compared with kisssoft calculation programs for machine design. A planetary gearbox gives a balance between weight and power transmitted. Based on the results of each step of validation, team 6 met all engineering specifications set fourth throughout the project. Case study two stage planetary gearbox ken singleton sept 4, 2006 before a determination of the source of the vibration could be made, an understanding of the gearbox design was required and calculation of the excitation frequencies. Gearbox design this presentation aims at designing an aero engine gearbox.

It features a sun gear, planetary gears, carrier and a ring gear. This represents a significant change in rotational speed. Gearbox precision gearboxes reliance precision limited. Design and optimization of planetary gears considering all relevant influences tobias schulze gear design process lightweight construction and consideration of available resources result in gearbox designs with high load capacity and power density. How to derive and calculate epicyclic gear ratio equations in.

The gearbox gives the output shaft higher torque and lower rpm. Advantages of an epicyclic gear artec machine systems. The exploded view shows the components of the gearbox that will be explained in this chapter. Epicyclic gearing systems also incorporate the use of an outer ring gear or annulus, which meshes. What is epicyclic gearbox main components, working and. Epicyclic gearbox, 5mm input bore, 10mm output shaft, 3. Intro planetary gears also refer as epicyclic gearing consisting three elements sun gear, planet gear and ring gear. 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. Each cad and any associated text, image or data is in no way sponsored by or affiliated with any company, organization or realworld item, product, or good it may purport to portray. A typical gearbox speed ratio in large wtgs may be around 30. Planetary gearing could increase torque and reduce load inertia while slowdown the speed.