Development of New Continuously Variable Transmission for Electric Bicycles
Published October 12, 2005 by Society of Automotive Engineers of Japan in Japan
Annotation of this paper is available
A new continuously variable transmission for an electric bicycle (EB-CVT) was developed. The EB-CVT has a new mechanism of the traction drive transmitting power through contacts between inner sphere and outer sphere. The EB-CVT permits three propulsion modes: human-power only, motor-power only or motor-power plus human-power and has high power efficiency with large torque capacity despite narrow space to be installed in. The continuously varying speed ratio enables the EB-CVT to increase efficiency and to improve driveability. The inner spherical surface contacts help satisfying large torque capacity. After minute processes of a conceptual design, performance analysis and optimization, a prototype is manufactured and installed in an electric bicycle to run road test. The performances and reliabilities of the EB-CVT are evaluated.
CitationPark, M. and Park, N., "Development of New Continuously Variable Transmission for Electric Bicycles," SAE Technical Paper 2005-32-0037, 2005.
- Lomonova, E.A., Vandenput, A.J.A., Rubacek, J., d'Herripon, B., Roovers, G., “Development of an Improved Electrically Assisted Bicycle”, Industry Applications Conference, vol.1, pp.384-389, 2002
- Seong S. H., Ryu J. H. and Park N. G., “A Conceptual Design On Inner Spherical Continuously Variable Transmission For Bicycle Usage”, International Journal of Automotive Technology, 2004
- Ku Il Keun, Park No Gill, “An Introduction of a New Traction Drive Pairing with the Inner and the Outer Surface of the Spherical Rotors for Automobile Usage”, International Journal of Automotive Technology, 2004
- Ryu J. H., Kim J. H. and Park N. G., “Development of the Inner Spherical Traction CVT for Scooters”, KSAE, 2004
- Pillkey Walter D., “Formulas for Stress, Strain and Structual Matrices” Chap.9
- Cho Chang K., Yun Myung Hwan, Yoon Chang S., Lee Myun W., “An ergonomic study on the optimal gear ratio for a multi-speed bicycle”, International Journal of Industrial Ergonomics, Vol.23, pp.95-100, 1999
- Harvey Philip D., Editor, “Engineering properties of steel”, American Society for Metals, Metals Park, Ohio 44073, second printing, 1985