Advanced Research Journals of Science and Technology
ADVANCED RESEARCH JOURNALS OF SCIENCE AND TECHNOLOGY
(ARJST)
GEOMETRIC OPTIMIZATION OF CONTACT RATIO IN SPUR GEAR USING FINITE ELEMENT ANALYSIS
2349-1845
P.Kamal Kumar 1, S.L. Narasimha Reddy 2, 1Research Scholar,Department of Mechanical Engineering,Siddhartha Institute of Engineering And Technology,Ibrahimpatnam, Telangana,India. 2Professor , Department of Mechanical Engineering, Siddhartha Institute of Engineering And Technology,Ibrahimpatnam, Telangana,India.
Abstract Maximum contact and fillet stresses in normal and high contact ratio spur gears are evaluated based on load sharing ratio using finite element method through single- and multi-point loaded models as well as multi-pair contact model. The multi-pair contact model has been justified as an appropriate one for the present analysis as this model exclusively considers the influence of the loaded adjacent teeth and the Hertz contact deflections. A detailed parametric study on the load sharing ratio and the respective stresses has also been carried out to analyze the effect of addendum height, the pressure angle, gear ratio, teeth number, and tooth size. Finally, the importance of load sharing ratio and the critical loading points for maximum fillet and contact stresses in normal and high contact ratio spur gears is highlighted for the effective design. The aim this project work is to provide optimum CONTACT RATIO for spur in contact pair load sharing condition, by using geometric optimization technique.
*Corresponding Author:
The gears in a transmission are analogous to the wheels in a pulley. An advantage of gears is that the teeth of a gear prevent slipping.
P.Kamal Kumar, Research Scholar, Department Of Mechanical Engineering, Siddhartha Institute of Engineering And Technology,Ibrahimpatnam, Telangana,India.
When two gears of unequal number of teeth are combined a mechanical advantage is produced, with both the rotational speeds and the torques of the two gears differing in a simple relationship.
Published: November 23, 2015 Review Type: peer reviewed Volume: II, Issue : III Citation: P.Kamal Kumar,Research Scholar (2015) GEOMETRIC OPTIMIZATION OF CONTACT RATIO IN SPUR GEAR USING FINITE ELEMENT ANALYSIS
PROBLEM DESCRIPTION: Gear failure causes by varies things, design failures are high and predictable, mainly gear tooth is getting week and slipping and tooth fracture is occurring while it is pairing other gear due to load sharing and contact b/w tooth. This is an attempt to rectify the above sad failures with the help of FEM by changing tooth fillet radius values. INTRODUCTION TO GEARS A gear is a rotating machine part having cut teeth, or cogs, which mesh with another toothed part in order to transmit torque. Two or more gears working in tandem are called a transmission and can produce a mechanical advantage through a gear ratio and thus may be considered a simple machine. Geared devices can change the speed, magnitude, and direction of a power source. The most common situation is for a gear to mesh with another gear, however a gear can also mesh a non-rotating toothed part, called a rack, thereby producing translation instead of rotation.
In transmissions which offer multiple gear ratios, such as bicycles and cars, the term gear, as in first gear, refers to a gear ratio rather than an actual physical gear. The term is used to describe similar devices even when gear ratio is continuous rather than discrete, or when the device does not actually contain any gears, as in a continuously variable transmission. The earliest known reference to gears was circa 50 A.D. by Hero of Alexandria, but they can be traced back to the Greek mechanics of the Alexandrian school in the 3rd century BC and were greatly developed by the Greek polymath Archimedes (287-212 BC). Types of Gears External vs. internal gears Spur Helical Double helical Bevel Hypoid Crown Worm Non-circular Rack and pinion Epicyclic Sun and planet Harmonic drive Cage gear
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