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2018, vol. 46, br. 2, str. 194-204
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Projektovanje pravozubih konusnih zupčanika otpornih na piting
Design of straight bevel gear for pitting resistance
aDepartment of Industrial Technology Texas Southern University Houston, Texas, USA bDepartment of Mechanical Engineering Nigerian Defence Academy Kaduna, Nigeria
e-adresa: osakueee@tsu.edu
Projekat: The authors gratefully acknowledge that this study was supported in parts with funds from COSET Research Fund and the University Faculty Development Fund of Texas Southern University, Houston, Texas
Sažetak
Prikazan je transparentan model veličine kontaktnog napona kod pravozubih konusnih zupčanika, izrađen na osnovu Tredgoldove geometrijske aproksimacije. Definisan je faktor opterećenja konusa koji obezbeđuje kinetičku vezu između fizičkog konusnog zupčanika i virtuelnog cilindričnog zupčanika. Prikazan je proračun kontaktnog napona za tri slučaja projektovanja zupčanika iz različitih referenci i izvršeno je upoređivanje sa AGMA procenama. Razlike u dobijenim rezultatima se kreću od 2,4% do 23,4% sa procenama novih modela, koje su obično niže od AGMA vrednosti. Verzija projekta određivanja dimenzija novog modela primenjena je na dva slučaja. Poređenje vrednosti faktora opterećenja u radnim uslovima pri određivanju dimenzija kod projektovanja zupčanika i verifikacije projekta pokazuje razliku od 0,76% u slučaju 4 i -1,65% u slučaju 5. Iako je za dalju verifikaciju pristupa projektovanju potrebno prikazati još slučajeva, može se zaključiti da je model projektovanja prihvatljiv.
Abstract
Based on the Tredgold geometric approximation, a transparent contact stress capacity model for straight bevel gears is presented. A bevel load factor is defined which provides a kinetic link between the physical bevel gear and virtual spur gear. Three design cases of contact stress computations from different references are carried out and compared with AGMA estimates. Differences in results vary from 2.4% to 23.4% with the new model estimates, generally lower than AGMA values. The design sizing version of the new model is applied in two design cases. Comparison of the service load factor values for design sizing and design verification indicates a difference of 0.76% in case 4 and -1.65% in case 5. While more design cases are necessary for further verification of the design approach presented, it may however, be concluded from the results of our study that the design model presented appears reasonable.
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