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Bevel gears have become a subject to research interest because the dynamicload, attention of the noise level during operation and demand for lighter and smaller. In such type of gears there is a problems of failures contact at meshing the teeths. This can be avoided or minimized by proper method analysis and modification of the different gear parameters. This thesis presents characteristics of a bevel gear in dynamic condition involving meshing stiffness and other stresses produce. The purpose of this thesis is by using numerical approach to develop theoretical model of bevel gear and to determine the effect of meshing gear tooth stresses by taking material case hardened alloy steel (15Ni4Cr1) . To estimate the meshing stiffness, three-dimensional solid models for different number of teeth are generated by Solid works and the numerical solution is done in Ansys which is a finite element analysis.
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A shaft driven bicycle is a bicycle that uses a shaft drive instead of a chain which contain two set of bevel gear at both the ends to make a new kind of transmission system for bicycle for getting high reliability system, and more safe system. This project is developed for the users to rotate the back wheel of a two wheeler using propeller shaft. Usually in two wheelers, chain and sprocket method is used to drive the back wheel. Shaft-driven bikes have a large bevel gear where a conventional bike would have its chain ring. This meshes with another bevel gear mounted on the drive shaft. The use of bevel gears allows the axis of the drive torque from the pedals to be turned through 90 degrees. The drive shaft then has another bevel gear near the rear wheel hub which meshes with a bevel gear on the hub where the rear sprocket would be on a conventional bike, and cancelling out the first drive torque change of axis.
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IEEE Sensors Journal
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A powertrain is a system of mechanical parts in a vehicle that takes the power, or output, of the engine and, through specific gear ratios, slows it and transmits it as torque. Through the driveshaft, the engine's torque is transmitted to the wheels of the vehicle, which, when applied to road, moves the body. Simply put, a powertrain is made up of a transmission system and a driveshaft.The mechanism that transmits the power developed by the engine of the automobile to the driving wheels is called the transmission system (or Power train).It provides a varied leverage between the engine and the drive wheels. It also provides the connection and disconnection of engine with rest of power train without shock and smoothly.The average person is most familiar with the powertrain of their car, which creates energy in the engine, which is transferred to the transmission. Main objective of this project is to design a powertrain system for a truck engine by manual calculation and computer aided designing.
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In the earliest machines that man built to do his work, gears formed an essential part. The teeth of these early gears were pegs fashioned out of wood and inserted in the rims of wooden wheels. They were crude affairs and the loads that were transmitted were necessarily lightspeeds were low. Lubrication was of little concern then, for when a tooth wore or broke, its replacement was a simple matter. The first big forward step in gear design came when peg teeth were abandoned, and teeth shaped much like those in modern gears were developed. Gears with teeth instead of pegs were made by mortising or keying individual hard wood pieces of the desired profile into the rim of a wheel. The first metal gears were probably cast of either bronze or iron. With this advance, lubrication assumed an important role in reducing wear and prolonging the life of the gear. Loads and speeds, however, were moderate and vegetable or animal oils sufficed as lubricants. Since those early times, correct gear-tooth profiles and proportions have been developed. Moreover, tools have been built capable of machining gear teeth in the hard, tough materials which advances in metallurgy have made available. Thus, present day gears with their accurately cut teeth of correct profile and finely finished surfaces are a far cry from the wooden pegged gears of the past. Modern gears fulfill a purpose in practically every field where power must be transmitted or where motions of machine parts must be controlled. Because of the countless ways in which gears are used, there are wide variations in their design, size, operating speed and loading. Paralleling the developments in the technique of gear design and manufacture, lubrication has become increasingly important. Even with accurately cut teeth of correct profile, gears can not operate successfully unless a lubricating film is maintained between the surfaces of the meshing teeth. If this film permits metal-to-metal contacts to occur, wear will be rapid, tooth profiles will be destroyed and failure of the gear will result. Correct Lubrication means that separating films are maintained, and that long gear life and reliable operation are assured. Once the impor tance of Correct Lubrication is fully realized more thought will be given to securing the right lubricant and to applying it in the right way. Gargoyle Lubricants, which are recommended in this publication for enclosed gears, are unusually stable, and therefore, resist oxidation to an exceptional degree. They rendex excellent service over long periods of continuous operation. Gargoyle lubricants recommended for open gears have the strong adhesive properties which enable them to cling to the tooth surfaces; thus they provide maximum protection. Moreover, for both enclosed and open types, they have the necessary high film strength to withstand the heavy loads and shocks that may accompany gear operation. FUNDAMENTALS. Gears are employed to transmit motion and power from one revolving shaft to another. The shafts on which gears are mounted can only take one of three positions with respect to each other-they may be parallel (Fig. 1), may intersect at an angle (Fig. 2) or may cross (Fig. 3). In each case, power and motion are transmitted positively, efficiently and dependably. Because of this, the application of gears to modern industrial machinery is practically without limit. FRICTION WHEELS Although gears are usually used to transmit motion from one shaft to another, it is quite pos. sible to transmit this motion by means of friction wheels. When pressed tightly together the fric tion between the surfaces is sufficient to transmit a limited amount of power. * If the shafts are parallel, the friction
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– Gears are one of the most critical components in mechanical power transmission systems. The gears are generally used to transmit power and torque. The efficiency of power transmission is very high when compared to other kinds of transmission. In the gear design, the bending stress and surface strength of the gear tooth are considered to be one of the main contributors for failure of the gears in gear set. Thus, analysis of stresses has become popular as an area of research on gears to minimize or to reduce the failures and for optimal design of gears. In this research, bending stress at the root of the helical gear tooth is calculated by using the Lewis stress formula. In this research, helical gear is designed by using SolidWorks 2016 and the numerical solution is done by using ANSYS, finite element analysis. The main objective of this research has to reduce the stresses induced in gear tooth profile by changing five different helix angles (13˚, 18˚, 23˚, 28ånd 33˚). Stresses are found out for three different material (AISI 5160 OQT 400, Stainless and Structural Steel). In this research, 23˚of helix angle is selected for helical gear used in synchromesh gearbox according to the ranges of helix angles and AISI 5160 OQT 400 is chosen for helical gear because the maximum von-Mises stress and strain values of AISI 5160 OQT 400 are less than other two materials. The results are then compared with both the Lewis equation and ANSYS procedure.
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