Fundamental Research on Torque Trans-mission Using a Sprag Clutch in the E-Bike Drivetrain Grundlagenforschung zur Übertragung von Drehmomenten mittels Klemmkörperfreilauf im E-Bike Antriebsstrang
Neusser K, Hamm M, Halmos F, Rothammer B, Wartzack S (2026)
Publication Type: Journal article
Publication year: 2026
Journal
Book Volume: 78
Pages Range: 46-50
Journal Issue: 7-8
DOI: 10.37544/0720-5953-2026-07-08-46
Abstract
Sprag clutches are essential functional components in the drivetrain of modern bicycles and especially e-bikes. Despite their technical relevance, only a few empirically reliable characteristic values for the design, evaluation, and optimization of these friction-based machine elements have been available to date. As part of a joint research project, Paul Müller Industrie GmbH & Co. KG and the Chair of Engineering Design (KTmfk) at Friedrich-Alexander-Universität Erlangen-Nürnberg developed a novel test rig that reproduces the key operating mechanisms of sprag clutches under realistic conditions (Figure 1). The test rig enables both static load tests and highly dynamic switching events and provides, for the first time, reproducible empirical data on torsional spring characteristics, switching behaviour and characteristic failure mechanisms. The results form a foundation for simulation, component design, and the development of durable, efficient, and lightweight e-bike drivetrain systems.
Authors with CRIS profile
Kevin Neusser
Chair of Engineering Design (KTmfk)
Fabian Halmos
Chair of Engineering Design (KTmfk)
Benedict Rothammer
Chair of Engineering Design (KTmfk)
Sandro Wartzack
Chair of Engineering Design (KTmfk)
Involved external institutions
Germany (DE)How to cite
APA:
Neusser, K., Hamm, M., Halmos, F., Rothammer, B., & Wartzack, S. (2026). Fundamental Research on Torque Trans-mission Using a Sprag Clutch in the E-Bike Drivetrain Grundlagenforschung zur Übertragung von Drehmomenten mittels Klemmkörperfreilauf im E-Bike Antriebsstrang. Konstruktion, 78(7-8), 46-50. https://doi.org/10.37544/0720-5953-2026-07-08-46
MLA:
Neusser, Kevin, et al. "Fundamental Research on Torque Trans-mission Using a Sprag Clutch in the E-Bike Drivetrain Grundlagenforschung zur Übertragung von Drehmomenten mittels Klemmkörperfreilauf im E-Bike Antriebsstrang." Konstruktion 78.7-8 (2026): 46-50.
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