Research Topic
| Kurztitel | Tribologically Optimized Internal Gears |
| Start of Project | Q2/2019 |
| Funding | FVA-Nr. 482/V, IGF-Nr. 22065 N/1 Federal Ministry for Economic Affairs and Climate Action, BMWK |
| Contact | Dr.-Ing. T. Tobie |
Project Description
In contrast to external gears, internal gears offer the possibility to place the pitch point C outside of the path of contact. Thereby, negative specific sliding can be completely prevented for either planet or ring gear. Furthermore, the values of the negative specific sliding can be reduced. Thus, the load capacity concerning pitting, micropitting and wear can be specifically influenced by a displacement of the pitch point C. However, results of systematic investigations on these influence factors are not available yet. The load capacity reserves of materials in the areas of positive specific sliding are not quantified and existing calculation methods for the flank load carrying capacity are not verified for internal gears with a pitch point outside of the path of contact.
Within the hereby proposed research project, substantial theoretical and experimental investigations on the influence of the position of the pitch point and the sliding conditions on the tooth flank of internal gears are to be carried out. On the basis of the results of these investigations characteristic values and limits of the load capacity for practice-relevant material pairings will be determined. Based on these results, the existing calculation methods for the pitting, micropitting and wear capacity will be reviewed and adjusted if necessary. The knowledge gained is the basis for an extension of existing standardized methods for the calculation of the load carrying capacity. By integrating the results obtained in standardized methods, especially SMEs will be able to put the knowledge gained into practice shortly after the end of this research project. By help of new calculation methods for assessing the load carrying capacity, the need for time and money consuming test runs can be rapidly decreased.