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International Journal of Automotive Technology > Volume 8(5); 2007 > Article
International Journal of Automotive Technology 2007;8(5): 593-598.
DEVELOPMENT OF INNER-SPHERICAL CONTINUOUSLY VARIABLE TRANSMISSION FOR BICYCLES
M. W. PARK, H. W. LEE, N. G. PARK, H. S. SANG
Pusan National University
ABSTRACT
A new continuously variable transmission for bicycles (B-CVT) is developed by using a traction drive mechanism having inner and outer spherical rotors. The B-CVT has high power efficiency, large torque capacity, improved drivability and good packageability. The ratio change mechanism for the B-CVT is very simple, in contrast with other traction drive CVTs. After completing a conceptual design, a performance analysis and a detail design, a prototype of the B-CVT has been manufactured. The prototype has rated power of 100 watts, pedal speed of 6 rad/s and an overall speed ratio of 1.0-4.0. A bench test and an actual bicycle test have been performed to verify the practicability of the BCVT.
Key Words: Continuously variable transmission (CVT), Inner spherical continuously variable transmission (ISCVT)
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