May 09, 2018 design of spur gear machine design spur gear gear design design of machinemdgtu spur gear design duration. Mitcalc internal spur gears is an excel spreadsheet built for geometric design and check of spur gearing with straight and helical toothing. Procedure for tooth contact analysis of a face gear. There are no great advances in gear technology described. Select suitable materials for pinion and wheel from the design data book first we will select the type of material for pinion and wheel based on the input parameters. The calculations use procedures, algorithms and data from standards ansi, iso, din, bs and specialized. Instead of using the theoretical pitch circle as an index of tooth size, the base circle, which is a more fundamental circle, can be used. Spur gear design as an exercise in gear selection, a stepbystep procedure will be demonstrated on how to design a gearset pinion and gear for a gearbox that is to be mass produced for a general industrial application. Abstract gear is the one of the important machine element in the mechanical power transmission system. Gear calculation of spur and helical gears with involute gear.
Gear innovation has been produced and extended as the centuries progressed. The number of teeth for spur gears is given by where k 1f fll1 for fulld tht th08f tbt th d ldepth teeth, 0. This paper presents the stress analysis of mating teeth of spur gear to find maximum contact stress in the gear teeth. First of all lets create excell table contained parameters thatll define the spur gear profile. Chapter 9 spur gear design free download as powerpoint presentation. I4 when fracture of the gear teeth due to bending is the primary mode of failure, the minimum number of teeth which avoids interference offers as the strongest gear set for a given size. Introduction modern gear design is generally based on standard tools. Also note that spur gear design we use today was first sugested by swiss mathematician leonhard euler 15. Precision requirement of gear, including gear pitch, shaft diameter, pressure angle and tooth layout. Investigation of contact stress in spur gear using lewis equation and finite element method ashish v kadu1 and sanjay s deshmukh1 corresponding author.
Mayuram indian institute of technology madras module 2 gears lecture 1 introduction contents 1. Drawing an approximate representation of an involute spur. At the same time, it is well known that universal standard tools. Jul 19, 2011 pitch diameter pd the diameter of an imaginary pitch circle on which a gear tooth is designed. Spur gear terms and concepts description in order to design, build and discuss gear drive systems it is necessary to understand the terminology and concepts associated with gear systems. Alternatively you can also calculate using a gear design software. Design and analysis of spur gear pinaknath dewanji mechanical engineering gitam institute of technology, gitam university, rushikonda, india. The optimal design of a spur gear mesh is a problem of considerable interest in mechanical design. Tutorial for gear design and calculation with mdesign gearbox. Formulas for gear calculation external gears contents. Permissible working stress for gear teeth in lewis equation. Geometric design and strength check of spur gear with straight and helical toothing. The gearset shall transmit 100 horsepower at a pinion speed of revolutions per minute.
Resources and usage design of transmission systems. This book is an attempt to apply that principle to gear design by presenting information from a manufacturing pointofview rather than a theoretical one. Horse power, speed of the driver, speed ratio, working life, working conditions. Apr 26, 2017 between gear 2 and gear 1, it is calculated as follows. Gear 1 is called a sun gear, gear 2 is a planet, link h is an arm, or planet carrier. Cylindrical spur gears with standard profile cylindrical spur gears with corrected profile without centre distance variation with centre distance variation. The complete procedure of design of spur gear is explained in this video step by step in very easy manner.
Spur gear design software free download spur gear design. Procedure for tooth contact analysis of a face gear meshing. Spur gear design and selection objectives apply principles learned in chapter 11 to actual design and selection of spur gear systems. Good designers and engineers have experience and knowledge and the ability to communicate their thoughts and ideas clearly with others. Introduction to gear design introduction albert einstein once said. The design and calculation of a spur gear transmission, one of the oftenperformed mechanical engineering tasks, requires a lot of long and complicated tedious computations. Direct gear design for spur and helical involute gears. Hoe to use psg design databook effectively is also covered in this video. In this mesh, the reference circle of the gear touchesthe pitch line of the rack. Spur gear creation american society for engineering. Determine allowable force on gear teeth, including the factors necessary due to. Spur gear design procedure free download as powerpoint presentation. Procedure for drawing an approximation of a spur gear the following procedure can be used to create gear models using cad workstations.
The result is called the base pitch p b, and it is related to the circular pitch p by the equation 78 7. Online gear calculation of spur and helical gears with involute gear sizes of individual wheel and gears pairing easy, fast and completely free. Gear design objectives understand basic principles of gearing. Chapter 9 spur gear design gear stress mechanics free. Scribd is the worlds largest social reading and publishing site. Rack and pinion gear design free download as powerpoint presentation. Relationship between the involute elements determination of base tooth thickness from a known thickness and viceversa. Here is step by step guide how to make spur gear using catia. Design of spur gear full design procedure of spur gear. This makes gear design quite simple almost like selecting fasteners, economical, and available for everyone, reducing tooling expenses and inventory. For the meaning of the terms used in the software and for additional information regarding spur gears, click on the spur gears help button. Design, modeling and analysis of helical gear according bending strength using agma and ansys article pdf available february 2014 with 6,527 reads how we measure reads. Nov 11, 2017 the complete procedure of design of spur gear is explained in this video step by step in very easy manner. Style and dimensions of gear blank design of the hub of the gear degree of precision required means of attaching the gear to the shaft means of locating the gear axially on the shaft august 15, 2007 11 kalpakjian schmid manufacturing engineering and technology, prentice hall spur gear nomenclature august 15, 2007 12 gear types helical gears.
In the stroke paint tab, click the button next to the x for flat color. Designing a gears basic shape by gear calculation software method you may calculate in your head to get the previous values as these calculations are simple. Design of spur gearmachine designspur geargear designdesign of machinemdgtuspur gear design duration. Gear design in mdesign gearbox march 2012 driveconcepts gmbh, dresden 3. Since the sun gear the largest gear is fixed, the dof of the above mechanism is one. If the mating gear has more teeth than the pinion, that is. Design of spur gears spur gear can be modeled similar. Spur gear is most basic gear used to transmit power between parallel shafts. It is neither necessary nor efficient to take the time to draw an exact involute. Spur gears design contraints limit their ability to transfer energy at high speeds and torques. Design of spur gear using psg design data book complete. Understand gear trains and how to calculate ratios.
Planetary gear trains example for the speed reducer shown, the input shaft a is in line with output shaft b. Gear wreck will happen because of its tooth fatigue and tooth surface wear, so strength design from both side is necessary. Jun 28, 2010 click and drag a box around the big gear, small gear, and circle shape to select them all. File type icon file name description size revision time user. The spur gear consists of the first tooth plus one tooth rotated clockwise and two teeth rotated counterclockwise for a total of four teeth. Pdf design, modeling and analysis of helical gear according. The file used to create the spur gear and rotate and translate into mesh are given in the patran session file spur. Choose in the element explorer gear spur gear external gear and drag it into the 3dview. Things should be made as simple as possible, but no simpler. Gear design and strength iupital has good strength, durability, wear resistance, and chemical resistance, so can be used to each gear.
For the analysis, 15nicr1mo15 and scm415 are used as the materials of the spur gear. About all the devices we consider as a machines use gear of some sort. Understand geometry of different gears and their dimensional pro perties. Errichello 1979 and ozguven and houser 1988 survey a great deal of literature on the development of a variety of simulation models for both static and dynamic analysis of different types of gears. The smallest number of teeth on a spur pinion and gear, onetoone gear ratio, which can exist without interference is np. Application supports imperial and metric units, is based on ansiagma and isodin standards and support many 2d and 3d cad systems. A thorough calculation of safety factors for gear 2 and gear 6 by association can be found in the appendix, and values for the other gears can be found in the results section of this report as well as in the excel sheet accompanying it.
The tooth numbers are n 2 24, n 3 18, n 5 22, and n 6 64. 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. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. Note that this was inspired by document i have found at website. 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. Inertia of the gear through acceleration and deceleration. Design shapes of spur gears khk gears gear manufacturer. Recognize different gearing systems and relative advantages and disadvantages between them. The results obtained from finite element analysis fea.
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