Abstract
Tooth root form and fillet radius have a great influence on gear tooth root strength that is one of the primary subjects of this paper. Special attention is given to analysis on impact of gear tooth fillet radius at the critical cross section on stress value and distribution. A first initial crack appears at the gear tooth and it is affected, the most, by root stress concentration. Hence, this paper's research topic is focused on finding the optimal fillet tooth root radius to minimize the tooth root stress intensity. This paper provides results achieved by application of numerical methods - finite element method (FEM) and real working conditions simulation. The results of this analysis are presented as figures and tables of Von Mises and normal stresses as well as charts against different values of tooth root fillet radius ρF in two case: with one tooth root fillet radius ρF and with two fillet radii ρF1 and ρF2 ('two level approach' in a root).
Highlights
Tooth root form and fillet radius have a great influence on gear tooth root strength that is one of the primary subjects of this paper
Analyses show that is not always correct and it is possible to get higher tooth root stresses with two fillet radius than only with one for the same determined gear (Table 3)
The most important are tooth root stresses caused by load in the inner contact point of mesh, because they are the greatest and the most important for failure appearance in a tooth root
Summary
All analytical and numerical researches are carried out on a real construction with real condition simulation. Considered gear is a part of structural elements of great power planetary transmitter (big excavator of power 2×550 kW) with following characteristics [3,7,8,9]:. O module m = 24 mm, o modification coefficients x1 = 0 and x2 = 0.326, o wheel width b = 350 mm, o torque Т = 2528.8 kNm, o number of teeth z1 = 20 and z2 = 96, o gear material is carbonized steel 17CrNiMo6. (according to DIN) with Young’s modulus E = 2.1×105 MPa and Poisons’s ratio ν = 0.3
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
