Bending Stress In Worm Gear Shafts Considering The Notch Effect And The Load Distribution

  • Worm gear units are helical gear units with an axis cross angle of 90°. The load distribution on several tooth flanks enables the transmission of high torques. The worm shaft is made of case-hardened steel and the worm wheel of a bronze alloy to avoid scuffing in the tooth contact due to high temperatures in the contact area. Since the wheel is made of a softer material, the gear units usually fail due to damage of the wheel. Common causes of damage are wear, pitting or fracture of a wheel tooth or the entire rim. According to the state of the art, the worm shaft is mostly designed against deflection. In the further literature, cases of tooth breakage of worm shafts are also documented. By modifying the gear geometry or using higher strength materials for the worm wheel, the worm shafts may fail due to force or fatigue fracture under high loads. The accuracy of the gear assembly also has a significant impact on the load distribution of gear units. Deviations in the nominal positions of the components may cause load increases andWorm gear units are helical gear units with an axis cross angle of 90°. The load distribution on several tooth flanks enables the transmission of high torques. The worm shaft is made of case-hardened steel and the worm wheel of a bronze alloy to avoid scuffing in the tooth contact due to high temperatures in the contact area. Since the wheel is made of a softer material, the gear units usually fail due to damage of the wheel. Common causes of damage are wear, pitting or fracture of a wheel tooth or the entire rim. According to the state of the art, the worm shaft is mostly designed against deflection. In the further literature, cases of tooth breakage of worm shafts are also documented. By modifying the gear geometry or using higher strength materials for the worm wheel, the worm shafts may fail due to force or fatigue fracture under high loads. The accuracy of the gear assembly also has a significant impact on the load distribution of gear units. Deviations in the nominal positions of the components may cause load increases and accelerate the failure of the gear unit. To estimate the influence of the assembly deviations on the bending stress in the worm shaft, this paper presents an analytical calculation approach for determining the bending stress by considering the notch effect, the notch position and the load pattern and distribution. Finally, the bending stresses caused by various load patterns caused by assembly deviations are calculated and the effect is evaluated.show moreshow less

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Metadaten
Author:Johannes Gründer, Alexander MonzORCiD
DOI:https://doi.org/10.11159/icmie23.132
ISSN:2369-8136
Parent Title (English):World Congress on Mechanical, Chemical, and Material Engineering
Publisher:Avestia Publishing
Place of publication:Ottawa
Document Type:conference proceeding (article)
Language:English
Reviewed:Begutachtet/Reviewed
Release Date:2025/02/18
Tag:Load capacity; Wormgears
Volume:9
Article Number:ICMIE 132
Pagenumber:8
First Page:1321
Last Page:1328
Konferenzangabe:Proceedings of the 9 th World Congress on Mechanical, Chemical, and Material Engineering (MCM'23) Brunel University, London, United Kingdom - August 06-08, 2023
institutes:Fakultät Maschinenbau und Versorgungstechnik
Institut für Chemie, Material- und Produktentwicklung
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