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. Equation and calculators to determine ratios of planetary or epicyclic gear assemblies. Service factor f1 service factor f2 based on load characteristics chart 2 based on motor types chart 3 intermittent operation for less than 3 hr. This software comes in handy to design planetary gears only. D rotation of driver per revolution of follower or the driven gear or pulley. New types of planetary face gear drives the developed face gear drives are shown in figs. Feb 20, 2015 how to calculate the gear ratio in a planetary gear set where one member is stationary. So, my question is, utilizing the solid works file. Planetary gear designer is yet another free gear design software for pc. The results show that the graphical representation is a simple, intuitive and practical method for power analysis and efficiency calculation, it can provide theoretical references for design work of the. On the ring gear blue the torque arm is attached so its speed is zero. At least one warning has occurred during the calculation. An epicylic gear is a planetary gear arrangement consisting of one or more planet epicyclic gears p meshed planetary gearbox design calculations filetype rotating round a central sun gear s.
Carrier as input if the carrier is acting as the input in the planetary gear system, rotating the ring gear while the sun gear is still, divide the number of teeth on the ring gear the driven gear by the number of teeth on the planetary gears the driving gears. Tobias schulze standardized calculation methods such as iso 6336 and din 3990 already exist to determine the load. A question that i often get is how to work out planetary gears using the gear template generator. Our lowbacklash planetary gear reducers are ideal for all applications.
Planetary gears incorporate a system of gears that spin about a central axle in which the user manually turns. The zar5 planetary gearing calculation program calculates the geometry and strength of sun, planet and ring gear spur or helical, involute teeth according to iso 6336, iso 28. This paper presents planetary gear transmissions, designed according to iso 6336 ref. Please start with the tutorial for shaft calculation to see how to introduce geometry and supports for single shafts. The ratio between the rotations of the 15tooth driver gear and the 45tooth driven gear is 3 to 1. Another class of gear train has wide application, the epicyclic or planetary train. The results show that the graphical representation is a simple, intuitive and practical method for power analysis and efficiency calculation, it can provide theoretical references for design work of the complex and closed planetary gears transmission. This is a new kind of bearing that can only be manufactured by 3d printing and comes preassembled. The governing kinematic equation for any planetary con figuration defines the angular. 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. In the past ive had luck using this site to create an illustrator file that i can extrude in rhino. Gear train with sun, planet, and ring gears matlab. In addition it let you compose full gear layouts with connetcted gears to design multiple gears system with control.
The comparison of planetary gear system over helical gears systems is. This important for handheld torque wrenches leads to very light weight tools. Creative solutions in design and production to ensure maximum torque trans mission, highest. Design of machinery an introduction to the synthesis and.
Choosing which piece plays which role determines the gear ratio for the gearset. The software enables calculation of the system gearbox in one step, including a complete documentation into a pdfa docu ment, according to iso 190051. Calculating gear ratios within a planetary gear set youtube. Research laboratory new design and improvement of planetary. This block models a gear train with sun, planet, and ring gears. Working assembly and several file formats of my working planetary gear with 5 planets in solid works 2014.
You will now rotate the outer ring gear by that amount to align it correctly with the planet. Epicyclic gearing is the basis of a planetary gearbox design. At the same time, expectations for gear reliability are high. But in kisssoft software there is no module for calculation of compound planetary gear. Planetary gear trains unm mechanical engineering program. 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. The tool investigated is from atlas copco st series and consists of three main parts. Calculate the input and outputs speeds and torques of gear boxes. Pdf design and calculation of planetary transmission with. Also the case study to determine the reduction ratio of two stage gear box is discussed.
A carrier connected to a drive shaft holds the planet gears. Sep 04, 2018 planetary calculatilns with spur and helical toothing. Planetary gear calculation in mathcad, made by gar. The formula used to calculate the coefficient of friction comes from benedict and. Design and optimization of planetary gears considering all.
Planetary gear calculation in mathcad, made by gary chen from team 4001 so i made this mathcad file with fully planetary gear ratio calculation, all you need is to put the motor name in. An epicylic gear is a planetary gear arrangement consisting. Determination of load distributions on double helicalgeared. Figure 1 below shows a simplified diagram of a planetary geartrain. The procedure is applied to several types of planetary gear trains. At this point, the outer ring gear should look correctly sized to mesh with the planet gears, however, the angle of the gear is off by half a gear tooth, or. 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. Each of these three components can be the input, the output or can be held stationary. How to i design a planetary gear with a gear ratio of 2. Working out the tooth counts for planetary gears is actually not that complicated, so i initially neglected to mention how to do it. The next steps depend on the state of the planetary gears connected to the carrier, although all use the. Nov 08, 2012 these and other parameters lead together with an calculation of the planetary gear on fatigue strength to small gear diameters versus standard servo gearboxes.
The fundamental formula of the planetary gear train with a rotating carrier is obtained by recognizing that this. So, my question is, utilizing the solid works file and the driving sun gear torque how do i calculate the load on the contact point for each of the gears. Ronald walters multilayer planetary drive ronald walters sent me some pictures and a description of a very complicated planetary gear drive that he built. Figure 1 the basic components of a planetary gearhead. Get epicyclic gear train problems and solutions pdf file for free from our online library pdf file. New types of planetary facegear drives the developed facegear drives are shown in figs.
One of the planetary gearsets from our transmission has a ring gear with 72 teeth and a sun gear with 30 teeth. By using solidworks software to build the 3d model of planetary gear, there are some things to do first, such as keeping a constant velocity ratio between two. Feb 23, 20 the trouble with 3d printing a ball bearing is that spheres dont adhere to the 45 degree rule, so they tend to print poorly, or if metal balls are used instead, then the bearing requires assembly. Pdf design for a biplanetary gear train researchgate.
It is a planetary gearset and functions like a cross between a needle bearing and a thrust bearing. Calculation of a planetary gear train this tutorial shows the usage of mesys shaft calculation with shaft systems. Here, all calculation are done according to din 3960 standard. Jul 06, 2019 epicyclic gear calculations pdf with four core components, calculating the gear ratio of planetary gear systems, also known as epicyclic gear systems, may seem daunting. As you launch this software, it lets you define the module size in mm, number of planets, segments per flank, number of teeth in internal and planet gear, etc.
It features a sun gear, planetary gears, carrier and a ring gear. Determination of load distributions on double helicalgeared planetary gearboxes dr. In planetary gears, torque density can be increased by adding more planets through multiple gear mesh points. Understanding, selecting and applying planetary gearheads. To determine the train ratio between the two gears, we use the following. Zar5 calculates the tooth contact for gear pair sunplanet and planetring gear. For a planetary gear stage we need at least two shaft groups. Planetary gear boxes chapter 10 7 technical information table 3 at the end of this section includes some examples of load classifications. The first constraint for a planetary gear to work out is that all teeth have the same pitch, or tooth spacing. Ports c, r, and s represent the shafts connected to the planet gear carrier, ring gear, and sun gear. Epicyclic gearing planetary gearboxes neugart gmbh. In addition it let you compose full gear layouts with connetcted gears to design multiple gears system with control of the inputoutput ratio and rotation speed.
Power analysis and efficiency calculation of the complex and. Number of ringgear teethnumber of sungcar teeth ris. Planetary gears are common in transmission systems, where they provide high gear ratios in compact geometries. Gears can be animated with various speed to demonstrate working mechanism. Given i have the solid works file,the pressure angle, and the gear ratios, i can easily calculate the distances, teeth numbers, etc. That is to say, the number of teeth in the ring gear is equal to the number of teeth in the middle sun gear plus twice the number of teeth in the planet gears. Finally, the relation between efficiency and transmission ratio is studied. Gear generator is a tool for creating involute spur gears and download them in svg format. The next steps depend on the state of the planetary gears connected to the carrier, although all use the same formula. Lightweight design for planetary gear transmissions. You will now rotate the outer ring gear by that amount to align it correctly with the planet gears.
For example, if the sun gear has 20 teeth and the ring gear has 60, the planetary gear has 80 teeth. Calculate gear ratio by dividing the number of teeth on the driven gear by the number of teeth on the driving gear. The research program covers basic ideas of the design of the proposed gear drives. Epicyclic gear calculations pdf with four core components, calculating the gear ratio of planetary gear systems, also known as epicyclic gear systems, may seem daunting. Schlecht, calculation of load distribution in planetary gears for an effective gear design process, agma, oct. In this calculation the planet gear is an idler gear. How to calculate the gear ratio in a planetary gear set where one member is stationary. Robotics, 3d printing and new means of transport all have.
I also know the initial driving torque of the sun gear. Planetary epicyclic gear ratios equations and calculators. This does not generate planetary gears, and im also unclear as to how design a planetary gear with a 2. The layout of the gears mimics a model solar system, hence the name, including the sun gear in the center and planet gears also called pinion gears shown in blue around the sun gear shown in orange. These and other parameters lead together with an calculation of the planetary gear on fatigue strength to small gear diameters versus standard servo gearboxes. What millennialold technique is the basics of many of the most innovative technical breakthroughs of this moment. The zar5 planetary gearing calculation program calculates the geometry and strength of sun, planet and ring gear spur or helical, involute teeth according to iso 6336, iso 28, din 3960, 3961, 3967 and 3990. The results can only be used for information purposes. In screw technology, planetary gears are usually driven on the central gear yellow. Calculating load on planetary gear from driving torque. As you launch this software, it lets you define the module size in mm.
Pdf symbolic computation of planetary gear train efficiency. Relationship ii can be verified by using the following. This means a planetary gear with say three planets can transfer three times the torque of a similar sized fixed axis. 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. Additionally, there is a diversity of planetary gears for different applications.
Excluded are calculations of strength and geometry of gears, shaft and rolling bearing, since they are similar to classical calculations for planetary gears. Planetary gear ratio calculations this article also available in spanish. The trouble with 3d printing a ball bearing is that spheres dont adhere to the 45 degree rule, so they tend to print poorly, or if metal balls are used instead, then the bearing requires assembly. This tutorial shows the usage of mesys shaft calculation with shaft systems. Two inputs are needed to obtain a predictable output. A twostage planetary gear stage is defined using the program. Understanding, selecting and applying planetary gearheads howard horn, product manager. Planetary calculatilns with spur and helical toothing. Mesys shaft calculation introduction this shaft calculation version 042017, file version 3. For every rotation of the 45tooth gear, the 15tooth gear must rotate 3 times. Tobias schulze standardized calculation methods such as iso 6336 and din 3990 already exist to determine the load distributions on gears inside a planetary gearbox, but by their very universal nature.
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