Tooth Stress Redistribution to Improve Bending Fatigue Strength of Spur-Gear

Samer A. Masoud Al-Said
Associate Professor
Mechanical Engineering Department, Jordan University of Science and Technology
(Currently visiting associate professor at King Saud University Riyadh Saudi Arabia)
P.O. Box 3030, Irbid 22110-Jordan
e-mail: masoud@just.edu.jo

Mohammad Qasim
Former Graduate Student
Mechanical Engineering Department, Jordan University of Science and Technology
P.O. Box 3030, Irbid 22110-Jordan

ABSTRACT
Two techniques based on stress redistribution are proposed to reduce the bending fillet stress of spur gear. In the first method, drilling circular holes through gear face near the tooth fillet will reduce the original maximum stress. In the second method, introducing pressurized hole near tooth fillet creates compressive stress field that will cancel part of the original tooth tensile stresses. Reductions up to 4.24% and 5.42 % of the maximum Von Mises stress at the root fillet of the tension side (RFTS) are achieved in the first and the second method respectively. Applying both methods to spur gear with small crack at RFTS leads to similar results of the un-cracked spur gear. Computer code utilizing boundary element method is developed to calculate gear stresses. Also, an optimisation method is applied to the proposed techniques to find the optimum fillet stress reduction. Using Commercial finite element analysis code will verify the obtained results.

KEYWORDS
Improving spur-gear strength, increasing spur-gear life, increasing spur-gear durability, improving spur-gear bending fatigue.


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