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New Approach for an Easily Detachable Electric Drive Unit for Off-the-Shelf Bicycles

TUM CREATE Ltd., 1 CREATE Way, #10-02 CREATE Tower, Singapore 138602, Singapore
Institute of Automotive Technology, Technical University of Munich, Boltzmannstr. 15, 85748 Garching, Germany
Author to whom correspondence should be addressed.
World Electr. Veh. J. 2018, 9(3), 37;
Received: 4 June 2018 / Revised: 6 July 2018 / Accepted: 6 August 2018 / Published: 23 August 2018
PDF [2220 KB, uploaded 23 August 2018]


While an increasing number of electric bicycles are sold, the majority is still conventional, i.e., pedal powered.Electric bicycles could raise the share of people cycling in place of more inefficient modes of transportation. This paper investigates and proposes a new approach for an electric drive unit that can easily be attached and detached to a large majority of existing off-the-shelf bicycles to convert them into legal electric assisted bicycles (pedelecs). Different drive mechanisms were investigated and a design with a friction roller at the rear wheel showed the greatest potential. A good solution is achieved with a single unit that incorporates batteries, electronics, motors and sensors in a single enclosure to minimize the mounting time. With a fastening on the seat stay tube using a simple clamp mechanism it can assist the cyclist on most existing bicycles. The legally-required pedal detection is done with an integrated proximity sensor. A prototype is built to prove a simple and nonspecific installation and convenient usage. View Full-Text
Keywords: bicycle; electric drive; light vehicles; mobility concepts bicycle; electric drive; light vehicles; mobility concepts

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Roemer, F.; Mrosek, M.; Schmalfuss, S.; Lienkamp, M. New Approach for an Easily Detachable Electric Drive Unit for Off-the-Shelf Bicycles. World Electr. Veh. J. 2018, 9, 37.

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World Electr. Veh. J. EISSN 2032-6653 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
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