Mar 26, 2018 design of spur gear problems dme design procedure for spur gears in machine design dme 2 duration. Spur gear design 1 free download as powerpoint presentation. After going through a few books, i realized that the design procedure for cycloidal gears is pretty much the same as that involved in designing involute gears. 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. Basically the project involv es the design, modelling and manufacturing of helical gears in marine applications.
If you know all spur gears parameters and you want to insert spur. Determine allowable force on gear teeth, including the factors necessary due to. Working of a principle gear box in a gear box, the counter shaft is mashed to the clutch with a use of a couple of gear. Jul 19, 2011 create a pair of gears using the following data. Scribd is the worlds largest social reading and publishing site. Wear is a phenomenon which removes the complete layer of surface or makes scratches on surface. The pinion gear, complete with 12 teeth, interferes with the second helical gear with 24 teeth, respectively. The programs used in the experiment included inventor, kisssoft and mitcalc. Direct gear design for spur and helical involute gears. Spur gear design procedure based on strength youtube. Sep 29, 2016 design procedure of gear box sliding gear type a. Design tab power transmission panel spur gear common defines the spur gear. Much of the time, gear design is considered as a speciality.
Gear design, computer aided analysis, gear hobbing, gear shaving, structural analysis 1. Both pinion and gear are made up of steel having ultimate tensile streneth of 660 nmm2. Direct gear design for spur and helical involute gears alexander l. Understand and determine necessary surface hardness of gears to minimize or prevent surface wear. Horse power, speed of the driver, speed ratio, working life, working conditions. Procedures have been presented to design a gear set.
Starting with the basic definitions of gears, conjugate motion, and the laws of gearing, learn the tools needed to understand the inter. Things should be made as simple as possible, but no simpler. A ratio equal to the number of teeth on a gear per inch of diameter. Spur gear creation american society for engineering. American standard ansi mpb steel spur gears pressure angle 1412 o s311 s312 s3 s314 s315 s316 s317 s318 s319 s320 s321. The cycloidal tooth profile is generated by the hypoc.
Spur gears component generator design calcula bon common design guide pressure angle 20. The gearset shall transmit 100 horsepower at a pinion speed of revolutions per minute. As a sample calculation, a stepbystep procedure will be demonstrated on how to design a spur gearset pinion and gear for a general industrial application. Kleiss nomenclature b w face width in the mesh d a outside circle diameter, mm in. Spur gear design procedure free download as pdf file. The smallest number of teeth on a spur pinion and gear, onetoone gear ratio, which can exist without interference is np. In a gear speed reducer, why the diameter of an outpur shaft is greater than input shaft.
The established procedure was implemented through the developed software so that a substantial saving in term of time and cost of production of the design is obtained. From the design data book first we will select the type of material for pinion and wheel based on the input parameters. In this paper, is developed the algorithm for design of the gear includes typical steps of analysis and stress calculation of the main components, such as gears, shafts and bearings. Gear design analysis is separated into design sizing and design verification tasks. From the design data book first we will select the type of material for. Gear innovation has been produced and extended as the centuries progressed. This ratio of teeth provides the ideal speed reduction to 862. Gear teeth are actually not shown on technical drawings. Design, modeling, helical gear, agma, fea and ansys cite this article. Design and analysis of spur gear pinaknath dewanji mechanical engineering gitam institute of technology, gitam university, rushikonda, india.
We initiated the process with a simpler spur gear, then advanced to the straight bevel gear and finally defined the governing parametric equations for a spiral bevel gear. Design actual gear systems, including specifying materials, manufacturing accuracy, and other factors necessary for complete spur gear design. 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. Use is free and fairfields privacy policy is not to monitor or retain user data from the site category. Pdf the design and calculation of a spur gear transmission, one of the often performed mechanical engineering tasks, requires a lot of long. Design guide selects the type of geometry calculation. Singh, design modelling and analysis of helical gear using catia, ansys and agma parameters. Dedendum of a tooth is its radial depth below the pitch circle. The outcome of this research would enhance the designers productivity by reducing the time. The opening pages deal with the aims of the gearbox and the reasons for each of the aims. The number of teeth for spur gears is given by where k 1f fll1 for fulld tht th08f tbt th d ldepth teeth, 0. Spur gear is most basic gear used to transmit power between parallel shafts.
In an involute gear, the profiles of the teeth are involutes of a circle. Design calculation of spur gear module springerlink. Abstractin this paper an algorithm to describe the ideal spur gear profile is proposed. 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 involute of a circle is the spiraling curve traced by the end of an imaginary taut string unwinding itself from that stationary circle. This new edition provides extensive information to designers on various aspects of gears and gearing systems.
Spur gear design example page 1 of 4 design a spur gear reducer for 125 hp at rpm input with nfs 2 for 10. Abstract gear is the one of the important machine element in the mechanical power transmission system. The function of a gear speed reducer is to change the form of the power from high speed low torque to the l ow speed high torque in other words the gear speed reduces, increases the. Computeraided design of spur or helical gear train g. When the counter shaft is bring in contact with the main shaft by use of meshing gears, the main shaft start to rotate according to the gear ratio. Worm gear sets consists of a helical gear and a power screw worm, used to transfer motion between non parallel and nonintersecting shafts. Building on the designcentric flow of that program, fairfield is an interactive web application with an enhanced user interface and added features.
Gear design objectives understand basic principles of gearing. This final chapter covers the design of a racingtype rear engine mounted gearbox. For designing a stepped drive o following informations are necessary highest output speed lowest output speed number of steps z number of stages to achieve the required number of speed steps. Following this, the design procedures for the internal gear pack are discussed, along with the arrangements of the various shafts. The handbook is based on iso specifications and is a unique blend of practical as well as the theoretical. Aug 15, 2017 example for spur gear design design of spur gear machine design gtu design of machine duration. Depending on your selected design guide, edit fields in the design tab enables. The dedendum for a pinion and mating gear are equal except in the long addendum design where the pinion dedendum is decreased while. Design, modelling and manufacturing of helical gear. There are no great advances in gear technology described. The diameter of a circle coinciding with the bottom of the tooth spaces. Following this, the design procedures for the internal gear pack are discussed, along with the arrangements of. Gear tooth breakage can be avoided by adjusting the parameters such as module and face width in a gear design.
Spur gearset has been designed and verified using three software programs and an analytical approach. Midhun2 1,2assistant professor 1,2department of mechanical engineering 1,2svs college of engineering, coimbatore abstract one of the most important component in mechanical is gear for the transmission of power with ease and with less friction. Calculate center to center distances for 2 or more gears in mesh. Computer aided design and drafting of helical gears. Spur gear creation american society for engineering education. The design objective functions considered in the gear design are, maximization of power delivered by the worm gear drive f. Building on the design centric flow of that program, fairfield is an interactive web application with an enhanced user interface and added features. It is proposed to focus on reduction of weight and producing high accuracy gears. So the counter shaft is always in running condition. Design of spur gear problems dme design procedure for spur gears in machine design dme 2 duration. Spur gear design example spur gear design example page 1.
American standard ansi mpb steel spur gears pressure angle 1412 o s311 s312 s3 s314 s315 s316 s317 s318 s319 s320 s321 s322 s324 s325 s328 s330 s332 s336 4. View notes spur gear design example from me 360 at pennsylvania state university. If the mating gear has more teeth than the pinion, that is. Gear design and strength iupital has good strength, durability, wear resistance, and chemical resistance, so can be used to each gear. The involute gear profile is the most commonly used system for gearing today. The gear drive is the wide range of applications and is particularly important as a form of mechanical transmission, but the design process requires large amounts of data access and computation. In order to design, build and discuss gear drive systems it is necessary to understand the terminology and concepts associated with gear systems. Calculate forces on teeth of spur gears, including impact forces associated with velocity and clearances. Understand gear trains and how to calculate ratios. More precisely, the goal is to describe the point to point movement to be used within a cnc machine. Rack and pinion sets a special case of spur gears with the gear having an infinitely large diameter, the teeth are laid flat. The article basic spur gear design appeared in the novemberdecember 1988 issue of gear technology summary primitive gears were known and used well over 2,000 years ago, and gears have taken their place as one of the basic machine mechanisms. 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.
With the number of teeth defined, the next step is the design of the gear tooth and its mate. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. Gear wreck will happen because of its tooth fatigue and tooth surface wear, so strength design from both side is necessary. Calculate gear and gear tooth dimensions using gear pitch and the number of teeth. 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. Spur gear design example spur gear design example page 1 of. For the meaning of the terms used in the software and for additional information regarding spur gears, click on the spur gears help button. Spur gears component generator dialog box design tab. The numbers of teeth to be used inthe gears are prod ucts of the pitch diameter and the chosen diarnetral pitch. Three parameters are the required algorithm input data. The dedendum of a standard proportion tooth equals 1. Fatigue design procedure pennsylvania state university. From industrys angle, gear transmission systems are viewed as one of the critical. The new speed is then transferred to the second shaft that is also support by two.
Example for spur gear designdesign of spur gearmachine design gtu design of machine duration. It is unnecessary to follow this procedure to draw gear teeth since most detail gear drawings employ approximations of gear teeth. Spur gear design and selection objectives apply principles learned in chapter 11 to actual design and selection of spur gear systems. Spur gear terms and concepts gears educational systems. From the design data book first we will select the type of.
Computeraided design of spur or helical gear train. This book is an attempt to apply that principle to gear design by presenting information from a manufacturing pointofview rather than a theoretical one. 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. Pinion is rotating at a speed of 1440 revolutions per minute. International journal of mechanical engineering and technology, 74, 2016, pp. Recognize different gearing systems and relative advantages and disadvantages between them. Good designers and engineers have experience and knowledge and the ability to communicate their thoughts and ideas clearly with others. Involute teeth of spur gears, helical gears and worms. Use is free and fairfields privacy policy is not to monitor or retain user data from the site. For example, if the desired ratio is 3 to 1, one pitch diameter will be three times larger than the other. Nevertheless, the configuration or determination of agear is just a part of the general system design.
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