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. A basic modeling is formulated to characterize both its design and operation. Design of machinery an introduction to the synthesis and. The bicycles acceleration hub is a great example of a planetwheel mechanism.
These planetary gearboxes are deployed in demanding industrial environments including packaging, textile, chemical, sugar, material handling equipment, mining, and steel industries. Now we can check to see if our chosen gear ratio will allow us to achieve our desired output speed, 357rpm. Calculation of a planetary gear train this tutorial shows the usage of mesys shaft calculation with shaft systems. Formulas for gear calculation external gears contents. In this chapter we will present a complete design of a onespeed gearbox driven by a belt transmission and driving a chain transmission.
The production cost of planetary gear trains is more compared to conventional gearbox. The gearbox focused on, and used for model validation in this report is a 2 stage planetary gearbox made by atlas copco. Lightweight design for planetary gear transmissions. Lewicki national aeronautics and space administration glenn research center cleveland, ohio 445 kelsen e. 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. 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. Planetary gear boxes chapter 10 chapter 10 planetary.
Cylindrical spur gears with standard profile cylindrical spur gears with corrected profile without centre distance variation with centre distance variation. Planetary gear ratio calculations this article also available in spanish. 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, these methods offer varying results depending on the gearbox design. The working principle of planetary gears has been known for many years, there is still a great interest. The next chapter explains the matlab calculation program based on the theory and.
A planetary gearbox design calculations filetype displays safety factors and life expectation as function of. Understanding, selecting and applying planetary gearheads. This important for handheld torque wrenches leads to very light weight tools. Christianhartmanngerlach, driveconcepts gmbh dresden dr. Bearing fault frequencies after the gearbox shaft speeds were determined, the bearing fault frequencies were calculated and listed in table 2. Additionally, there is a diversity of planetary gears for. F gear units are usually applied in the transmission of a. Planetary gearheads are used on high precision motion control applications that require a high torque to volume ratio ranging from a factor of two to a factor of 100, depending on the ratio, high torsional stiffness and low backlash the specifics of which will vary by application.
Past experimental planetary gear research has focused. A planetary gearbox is used to transfer the largest torque in the most compact form known as torque density. On completion of this short tutorial you should be able to do the following. Please start with the tutorial for shaft calculation to see how to introduce geometry and supports for single shafts. Case study two stage planetary gearbox ken singleton sept 4, 2006 step 4. But the small gap between gear teeth leads to lost motion. Pdf the determination of the mechanical efficiency of a planetary gear train has been the object of. Next, we will determine the rotational velocity of the gearbox output shaft using equation 2.
Elecon also manufacturers helical planetary gearbox and bevel planetary gearboxes. Planetary gearing could increase torque and reduce load inertia while slowdown the speed. The point on the imaginary line joining the centers of the two meshing gears where the pitch circle touch august 15, 2007 47 august 15, 2007 48. Also, the book presents key areas of kinematics, dynamics and testing of a planetary gearbox with 2dof. Planetary gearbox fault detection using vibration separation techniques david g. Pdf product catalogue helical, worm, bevel helical gearbox. Transmitted power output 10 kw, electric motor speed 1450 min, required output speed 30 min. A question that i often get is how to work out planetary gears using the gear template generator. Pdf program design for the 3k planetary gear mechanism with. Two inputs are needed to obtain a predictable output. Sep 04, 2018 planetary calculatilns with spur and helical toothing.
Calculation of number teeth of sun, planets and ring gear. Pdf design and conduct of precision planetary gear vibration. Example of gearbox calculation mechanical, industrial and. Load type static, slight impacts, service life 20,000 hours. Presently, planetary gears are frequently used as main reduction gears in propulsion gas turbines for merchant ships. A planetary gearbox is used to transfer the largest torque in the most compact form known.
The exploded view shows the components of the gearbox that will be explained in this chapter. Two forms of planetary gears of the bevel type are shown in figures 23 and 24. Determination of load distributions on double helicalgeared. Tutorial for gear design and calculation with mdesign gearbox. Gearbox design contreras, marisol gregorio, kevin obdulio sosa, carlos alberto florida international university department of. 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. The procedure for the design was an iterative process to determine the optimum dimensions and. Design and optimization of planetary gears considering all. Planetary gearbox fault detection using vibration separation. Calculation of a two stage gearbox this tutorial shows the usage of mesys shaft calculation with systems of parallel shafts. Excluded are calculations of strength and geometry of gears, shaft and rolling bearing, since they are similar to classical calculations for planetary. R series motor and gearbox calculations pdf this is guide to gearbox and motor selection for those not fully familiar with the selections. Planetary gear is a widely used industrial product in midlevel precision industry, such as printing lathe, automation assembly, semiconductor equipment and automation system.
Selecting gears in metric unit the gear tooth profile of the spur gear will be in module. Calculate the input and outputs speeds and torques of gear boxes. 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 lower horsepower applications, high ratio planetary systems are combined with hydrostatic drives to produce wheel drives for agricultura. At the same time, expectations for gear reliability are high. Planetary gear boxes chapter 10 4 technical information table 1 thermal power adjustment factor fk work time % room temperature c 10 20 30 40 50 100 1.
When two gears meet their pitch circles are tangent to each other pitch diameter dp and pitch radius r. Pdf design and analysis of an epicyclic gearbox for an. A twostage planetary gear stage is defined using the program. For geared motors gear motor manufacturer reduction gearbox. 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. Creative solutions in design and production to ensure maximum torque trans mission, highest. Since, i am working in the metric unit every dimension will be in mm. Planetary gearboxes are used frequently to match the inertias, lower the motor speed, boost the torque, and at the same time provide a sturdy mechanical.
Solid mechanics tutorial gear systems this work covers elements of the syllabus for the edexcel module 21722p hncd mechanical principles outcome 3. Again, this advantage is rooted in the distribution or. For purposes of calculating the bearing fault frequencies of the planet bearings, the spin frequency of. An epicylic gear is a planetary gear arrangement consisting of one or more planet epicyclic gears p meshed and rotating round a central sun gear s. Army research laboratory glenn research center cleveland, ohio 445 ryan t. Atlas copcos previous knowledge about power losses in planetary gears. Pdf symbolic computation of planetary gear train efficiency. Planetary calculatilns with spur and helical toothing.
Planetary epicyclic gear ratios equations and calculators. Another class of gear train has wide application, the epicyclic or planetary train. Calculation of the equivalent working torque me knm. Pdf the article presents the design for a biplanetary gear train. A new planetary gearbox has two degrees of freedom and it can be used to adjust the transmission ratio according to the externally applied load.
I have listed below the calculations of the frequencies that we look for when checking planetary drives. The dualwheel transmission dwt, proposed elsewhere using epicyclic gear. 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. Relationship between the involute elements determination of base tooth thickness from a known thickness and viceversa. Structure and features 4 types 5 standard reduction ratio ip 6 recommended lubrication oils 6 selection of. A planetary gearbox is a gearbox with the input shaft and the output shaft aligned. Automatic transmission basics linnbenton community college. A planetary gearbox gives a balance between weight and power transmitted. An epicylic gear is a planetary gear arrangement consisting. We will account for the 75% gearbox efficiency at this stage in the calculations. Pdf design and analysis of an epicyclic gearbox for an electric. The planet gear in figure 23 rotates about a fixed bevel gear at the center of which is the driven shaft. Tutorial for gear design and calculation with mdesign gearbox dipl. Working out the tooth counts for planetary gears is actually not that complicated, so i initially neglected to mention how to do it.
They are widely used in rotor drive gearboxes for helicopter aircraft. Planetary gear trains are one of the main subdivisions of the simple epicyclic gear train family. Our lowbacklash planetary gear reducers are ideal for all applications. We have found that the third harmonic of the planetary fundamental gear mesh frequency is the best indicator of a problem, and exhibits the best side bands.
Distributions on double helicalgeared planetary gearboxes dr. Pdf design for a biplanetary gear train researchgate. The formulas of gearing ratio, concentricity condition, installation condition and. All the components are modelled in catia to check the assembly and the. Pdf this paper deals with the gear matching of 3k planetary gears. To compare with traditional gearbox, planetary gear has several advantages. Planetary gear trains are extensively used for the power transmission and are the most critical component.
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