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International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 9    
Website: http://www.ijser.org
scirp IJSER >> Volume 2, Issue 9, September 2011
Effect on Strength of Involute Spur Gear by Changing the Fillet Radius Using FEA
Full Text(PDF, 3000)  PP.  
Author(s)
Ashwini Joshi, Vijay Kumar Karma
KEYWORDS
Gear Design, Gear Strength, Fillet Radius, Circular Fillet, Trochoidal Fillet, Pro/ENGINEER, Pro/MECHANICA, Deflection
ABSTRACT
Gearing is the special division of Mechanical Engineering concerned with the transmission of power and motion between the rotating shafts. Gears not only transmit motion and enormous power satisfactorily, but can do so with very uniform motion. It is the best and the economical means of achieving this transmission. Gear teeth fails due to the static and the dynamic loads acting over it, also the contact between the two meting gears causes the surface failures. The gear fails without any warning and the results due to this failure are catastrophic. Since the requirements are broad and are of varying difficulty, gearing is a complex and diversified field of engineering. It includes gear mathematics, geometrical design, strength and wear, material and metallurgy, fabrication and inspection. Therefore for all the reasons mentioned, this work is of more practical importance. To get the gear of more durability we can use improved material, hardening the gear surfaces with heat treatment and carburization, shot penning can be done to improve the surface finish, to change the pressure angle by using asymmetric teeth, introducing the stress relieving features of different shape, changing the addendum of the spur gear and altering the design of root fillet are the other methods. Present work deals with the effect on gear strength with variation of root fillet design using FEA. Circular root fillet design is considered for analysis. The loading is done at the highest point of single tooth contact (HPSTC).
References
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[2]. Christos A. Spitas and Vasilis A. Spitas, “Generating Interchangeable 200 Spur Gear Sets with Circular Fillets to Increase Load Carrying Capacity”, International Conference on Gears, Vol. I, VDI – Verlag, Dusseldorf, Germany, July/August 2006, pp. 927-941.

[3]. V. Spitas, Th. Costopoulos and C. Spitas, “Increasing the Strength of Standard Involute Gear Teeth with Novel Circular Root Fillet Design”, American Journal of Applied Sciences, Science Publication 2005, pp. 1058-1064.

[4]. M.Savage , K.L. Rubadeux and H.H.Coe, “Bending Strength Model for Internal Spur Gear Teeth”, Army Research Laboratory ,Technical Memorandum San Diego, California, July 10-12, 1995.

[5]. M. Koilraj, Dr. G.Muthuveerappan, Dr. J. Pattabiraman, “An Improvement in Gear Teeth Methodology Using Finite Element Method”, IE Journal MC, Vol.88,Octomber 2007.

[6]. Pro/ENGINEER Wildfire 5.0

[7]. Mike Renfro, “Modeling Gear Teeth in Pro/Engineer Wildfire 4.0,2010.

[8]. Roger Toogood, “Pro/Mechanica Tutorial”. University of Ulberta.

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