Development and validation of the theoretical principles for the design of eccentric cycloidal gears

Key Info

Basic Information

01.02.2019 to 31.07.2021
Organizational Unit:
Chair of Machine Tools, Gear Technology
Forschungsvereinigung Antriebstechnik FVA, German Federation of Industrial Research Associations AiF



+49 241 80 25380



Starting Situation

The most important type of gearing in mechanical engineering is involute gearing. This has certain advantages but also some shortcomings: a lower load capacity, which is determined by the tooth size, as well as a limited transmission ratio. In the case of single-stage gearboxes, this is rarely more than seven. The single-stage eccentric cycloidal gearing promises a very high transmission ratio of up to 40 and a higher torque carrying capacity. With an efficiency of more than 99%, space, weight and manufacturing costs could be saved and a significant increase in efficiency and economy could be achieved. There is currently no experience in the design of EZ gearing. For the applicability of EZ gearing in industrial practice, however, a design method for EZ gearing is necessary. The design of the EZ gearing is only made possible by a well-founded geometric description and the simulative mapping of the tooth contact of the EZ gearing.

Research Objective

The aim of the project is to develop and validate a design method for DC gearing. Based on the design method, the simulative prediction of the operational behaviour of the development cooperation gearing will be possible. Based on this prediction, the essential influencing variables of the geometric parameters of the EZ gearing can be determined on the basis of a sensitivity analysis. Thus, the parameter space is reduced to the essential gearing parameters and the application behavior is optimized for the application purpose. The parameter space is secured experimentally so that design recommendations for EZ gears can be derived from the results of the design method. Based on these findings, requirements for manufacturing quality can be functionally defined.