Sports Engineering

, Volume 7, Issue 2, pp 65–73 | Cite as

Optimisation of the chain drive system on sports motorcycles

Original Articles

Abstract

This paper investigates the optimisation of the chain drive system on sports motorcycles. Recently there has been the development of a chain transmission efficiency model that is suitable for motorcycles. The new model is used to predict the efficiency of 600cc sports motorcycle at different speeds. The transmission efficiency is estimated to be between 96 and 99% for speeds less than 75 mile/h. Between 75 and 150 mile/h the transmission efficiency can be as low as 85% due to inertial tension. The transmission efficiency model presented in this paper enables optimisation of sprocket and chain sizes. In general, large sprockets are better at low speeds and smaller sprockets are better at high speeds. The optimum chain size is the chain with the smallest pitch that can meet the torque and power requirement. The sprocket centre distance also has a big effect on efficiency and it is important to use an effective installation procedure. In particular, it is important to set a chain up when the rear wheel axle, front crank and swing arm bearing are all in-line.

Keywords

transmission efficiency power loss roller chain 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Boullion, G. & Tordion, G. V. (1965) On polygonal action in roller chain drives,Transactions of the American Society of Mechanical Engineers, Journal of Engineering for Industry, 243–250.Google Scholar
  2. Burgess, S. C. (1998) Improving cycling performance with large sprockets,2nd International Conference on the Engineering of Sport, pp. 23–29.Google Scholar
  3. Burgess, S.C. (1998) Improving cycling performance with large sprockets,Journal of the Engineering of Sport,1 (2).Google Scholar
  4. Hamer, M. (1998) Big is better,New Scientist,2126, 21 March.Google Scholar
  5. Lodge, C. (2002)Wear and efficiency modelling of roller chains, PhD thesis, Bristol University.Google Scholar
  6. Lodge, C.J. and Burgess S.C. (2002) A model of the tension and transmission efficiency of a bush roller chain,Proceedings of the Institution of Mechanical Engineers, Part C, Journal of Mechanical Engineering Science,216, 385–394.CrossRefGoogle Scholar
  7. Lodge, C. and Burgess S.C. (2002) Experimental measurement of roller chain transmission efficiency,Proceedings of the International Conference on Gearing, Transmissions, and Mechanical Systems, pp. 603–612.Google Scholar

Copyright information

© International Sports Engineering Association 2004

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringBristol UniversityBristolUK

Personalised recommendations