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.…


| 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 |
