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
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).
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