Determine allowable force on gear teeth, including the factors necessary due to. Ppt chapter 9 spur gear design powerpoint presentation. View and download powerpoint presentations on spur gear ppt. The gear found in the image above uses an involute tooth profile. Therefore, each pinion couples that spur gear to the other pinion, and in turn, the other spur gear, so that when the drive shaft rotates the carrier, its relationship to the gears for the individual wheel axles is the same as that in a bevel gear differential. Gear generator is a tool for creating involute spur gears and download them in svg format. Sushil kumar tiwari 5 found out the contact stress and bending stress for involute. Manufacturing of eccentric gear and working of eccentric mechanical press submitted in partial fulfillment of the requirement for the award of degree of. But so me experts say a little undercutting in gears does not. Volume i, issue vi, november 2014 ijrsi issn 2321 2705. These are actually the second and third gears i have ever made.
Joe michael2 1,2 pg student, meengineering design, psna college of engineering and technology, tamilnadu, india. Spur gears or straightcut gears are the simplest type of gear. Relationship between the involute elements determination of base tooth thickness from a known thickness and viceversa. Design and fabrication of gear box full report download gearbox a gearbox, also known as a gear case or gear head, is a gear or a hydraulic system responsible for transmitting mechanical power from a prime mover an engine or electric motor into some form of useful output. They consist of a cylinder or disk with the teeth projecting radially, and although they are not straightsided in form they are usually of special form to achieve constant drive ratio mainly involute, the edge of each tooth is straight and aligned parallel to the axis of rotation. Contact stress and shear stress analysis of spur gear using. Jul 19, 2011 create a pair of gears using the following data. Mar 28, 2020 a spur gear is the simplest and most common type of gear. Calculate forces on teeth of spur gears, including impact forces associated with velocity and clearances. The connection between both the gears has been set to frictional for all the gear teeth. You edit the gears to provide clearance for the shafts. The different styles offered include spur, gear rack, pinion wire, stem pinions, and internal gears, and most come with a selection of bore diameters, keyways, and setscrews to accommodate a wide variety of application requirements. Gears spur gears are by far the most common type of parallelshaft gear.
Gear terms, concepts and definitions spur gears are cogged wheels whose cogs or teeth project radially and stand parallel to the axis. The spur gear is used in many everyday devices, from the tiny plastic ones in windup toys to the large metal versions used in industrial washing machines. Calculation of gear dimensions gear dimensions are determined in accordance with their specifications, such as module m, number of teeth z, pressureangle. Industrial experts rely on martin for three simple reasons. Left gear applied with 20 degrees step rotation and right gear applied with a moment of 10nm for all the steps. A spur gear drive is a combination of two spur gears properly meshed with each other. They changes from tiny size utilizes as a part of watches to the. Spur gear terms and concepts gears educational systems. Diametral pitch dp the diametral pitch describes the gear tooth size. The range of addendum modification coefficient is taken from negative value to positive value through zero by. Spur gear design project a pair of spur gears with 20, fulldepth teeth is to be designed as part of the drive for a woodchipper to cut pulpwood for use in a paper mill.
A spur gear pair to be used in a back to back test rig is designed by using the software according to iso and din standards. Generally speaking, when two spur gears are in mesh, the gear with more teeth is called the gear and the one with the smaller number of teeth is called the pinion. The input gear has 20 teeth and the output gear has 100 teeth. One disadvantage of helical gears is that they produce an additional end thrust along the axis of the shaft which much be compensated for. Bevel gear precision forging production line according to user requirements for the bevel gear accuracy, the forging process is also very different.
Claire soares, in gas turbines second edition, 2015. Mounting type range capacity range cost required e. Spur gears are used to this effect in washing machines, blenders, clothes dryers, construction equipment, fuel pumps and mills. To create the spur gear, students will use the gear. Spur gear creation american society for engineering. Pdf the design and calculation of a spur gear transmission, one of the.
It is essentially a disk with a series of uniform teeth projecting along the outer edge. A study into the effects of addendum modification on root stress in involute spur gears with various pressure angles are presented in this project work. The circle on which two gears effectively mesh, about halfway through the tooth. Cylindrical spur gears with standard profile cylindrical spur gears with corrected profile without centre distance variation with centre distance variation. The task for each team working on this project was to design a singlereduction spur gearbox which includes a housing, ball bearings, spur gears, mechanical keys and shafts to meet specifications given for each team. In future it will be helpful for us to choose the right gear among various types gear. Dec 18, 2012 so, just be careful using outside diameter in your calculations if you estimated it from a gear with an odd number of teeth. It is used for transmitting rotational motion between parallel. A 08d41a0311 08d41a0315 08d41a0339 09d45a0301 under the. One disadvantage of helical gears is that they produce an.
Design and optimization of 2stage reduction gearbox. The sole variance in their identity remains the rack, which is covered more indepth in engineering360s rack and pinion specification guide. Pdf new perspectives such as harmonic mean, contact patch as translating third. Are cogged wheels whose cogs or teeth project radially and stand parallel to. If the teeth were parallel to the axes they would be straight or spur teeth as they are more oommonly caned. This spacing is critical for creating smoothrunning gears.
The objective of the project is to reduce the stress distribution, deformation and weight of spur gear by using composite materials in the application of gear box. The different styles offered include spur, gear rack, pinion wire, stem pinions, and internal gears, and most come with a selection of bore diameters, keyways, and setscrews to accommodate a wide variety of. In the software kisssoft we apply the problem with the objective function of minimizing of volume of gear trains. The power source is an electric motor that drives the pinion at 1750 rpm. A sample box of various types of gears types of gears. Half the pitch diameter of the first gear plus half the pitch diameter of the second gear will equal the correct center distance. Spur gear design and selection objectives apply principles learned in chapter 11 to actual design and selection of spur gear systems. Contact stress and shear stress analysis of spur gear using ansys and theoretical putti srinivasa rao professor, dept. Though several types of profiles can be used for cutting teeth on a spur gear, we commonly use involute teeth profile. The objective function was constrained by bending strength contact stress face width and number of pinion and gear teeth. Find the pitch diameter the circular pitch the outside diameter addendum diameter august 15, 2007 62 metric units a spur gear of the 14.
Various types of gears there are many types of gears such as spur gears, helical gears, bevel gears, worm gears, gear rack, etc. The simplicity of spur gears means that they are commonly used in number of machines, from cars to household appliances. The designed gear system should fit within a space limit. They consist of a cylinder or disk with the teeth projecting radially, and although they are not straightsided in form they are usually of special form to achieve constant drive ratio mainly involute, the edge of each tooth is straight and aligned parallel to the axis of rotation these gears can be meshed together. Formulas for gear calculation external gears contents. Nonmetallic phenolic grade c material provides quiet, corrosion resistant operation. The same gear pair is then analyzed by using both developed software and another software kiss soft based on iso and din standards and the results are compared. Specifications of the bevel material and lubrication can be defined like described before. In power stations, socalled trains of spur gears are used to convert a form of energy, such as wind or hydroelectric power. A spur gear is the most basic type of gear available. Spur gears can be used to increase or decrease the torque, or power, of a given object. Nov 08, 2017 i am cutting some gears for a future project.
This common type of failure which is a slow, progressive failure caused by repeated loading. Spur gear, to select gear materials,to analysis spur gears also to detailed factor safety in design computer. 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. Design of spur gear and its tooth profile for given power krishankant kankar1, r. Spur gears have straight teeth that run parallel to the shaft. Bachelor of technology in mechanical engineering submitted by. From sprockets and power transmission components to hand tools, from bucket elevators to conveyor pulleys. Figure 2 assignment of the revolute joint for spur gears.
They transmit the drive to each accessory unit, which is normally between 5000 and 6000 rpm for the accessory units and approximately 20,000 rpm for. Choose in the element explorer gear spur gear external gear and drag it into the 3dview. Transmitting power between parallel axes, the teeth project radially on the disc. Design specifications the purpose of this design project was to design a singlereduction spur gearbox, which includes a housing, ball bearings, spur gears, mechanical keys, and shafts. The company has planned to develop a series of singlereduction spur gearbox reducers.
They also tend to be slightly less efficient than spur gears because. The simplicity of spur gears means that they are commonly used in number of machines, from. Ppt spur gear powerpoint presentation free to download. 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. Spur gear project gutenberg selfpublishing ebooks read. Quality power transmission and material handling solutions.
Torque is applied to one of the spur gears and by frictionless support. Its a final paper based on spur gear fabrication project. Boston gear spur gears are designed to transmit motion and power between parallel shafts. Singh2 department of mechanical engineering, ipsctm gwalior474001 abstract spur gears are the most widely recognized means of transmitting power in the current engineering applications. This section introduces the dimension calculations for spur gears, helical gears, gear rack, bevel gears, screw gears, and worm gear pairs. An analysis is done on footstep power generator project where gear driver is used, analysis is done in ansys software. The spur rack is a portion of a spur gear with an infinite radius. Spur gears are simple, easily manufactured gears and are usually the first choice when exploring gear options. A spur gear is one of the simplest and most common types of cylindrical gears. These gears are easy to manufacture and can be used in a variety of applications. It consists of nothing more than a cylinder or disk with radially projecting teeth aligned parallel to the rotational axis.
Chapter 9 spur gear design 1 chapter 9 spur gear design pinion gear 2 lecture steps. So the designer could say if he sums pitch diameters of the mating gears, it should be less than or equal to allowable space limit as shown in figure below. Augmented lagrange has been chosen to resist the penetration of the contacts. This video details the process of drawing an involute spur gear by hand in solidworks. The spur gears of the external or auxiliary gearbox gear train figures 84 and 85 are mounted between bearings supported by the front and rear casings that are bolted together.
Design and fabrication of gear box full report download. Spur gears can handle high horsepower and shock loads but are not the most compact way to transmit power due to the relatively low contact ratio that can be obtained. Spur gear is the most basic gear used to transmit power between two parallel shafts with almost 99% efficiency. It has the largest applications and, also, it is the easiest to manufacture. This project requires a full educational or industrial license of mastercam it does not work with the home learning edition. First, look over the anatomy of the spur gear pair in this figure and the vocab below. Spur gears are manufactured in delrin, nonmetallic, brass, steel, and cast iron materials for maximum versatility.
Stress analysis on spur gear using ansys ansys simple. Spur gear this is a cylindrical shaped gear in which the teeth are parallel to the axis. These applications include speed increase or reduction, torque multiplication, and enhancing accuracy for positioning systems. Spur rack this is a linear shaped gear which can mesh with a spur gear with any number of teeth. When important power drive criteria are smooth, slipfree uniform motion, light weight, high sp eed, high efficiency. Contact stress analysis of spur gear for different materials. Find powerpoint presentations and slides using the power of, find free presentations research about spur gear ppt. Design of spur gears spur gear can be modeled similar. Contact stress analysis of spur gear for different. It requires the better analysis methods for designing highly loaded spur gears for power transmission systems that are both strong and quiet.
The designed composite spur gear is compared with the existing gear material, which is a cast steel spur gear. Tutorial for gear design and calculation with mdesign gearbox. Abstract a gear or gear wheel is a rotating machine part having cut teeth, or cogs, which mesh with another toothed part in order to transmit power. The students will machine the gear using contour toolpath. In this section of the project, you add a spur gear set to an assembly. Gear design in mdesign gearbox march 2012 driveconcepts gmbh, dresden 3. Gears can be animated with various speed to demonstrate working mechanism. Spur gears are the most widely recognized means of transmitting power in the current engineering applications. Relative characteristics of gear types 1 best 5 worst ratio power speed relative space approx.
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