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Generation method of asymmetric chainring design from pedaling torque experimental data

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Abstract

In cycling, pedaling is a bilateral asymmetries function that related to leg dominance. However, studies about the asymmetric shape on the chainring design considering pedaling asymmetries function and the test are limited. In this paper, a method to generate an asymmetric chainring from the experimental data is proposed. The curve fitting method and the flowchart to synthesize the asymmetric shape from the crank torque data are presented. The experimental test to compare the chainring prototype and the circular chainring on the same number of teeth is conducted. The comparison test is performed by comparing the downstroke torque and power at the same rotational speed on the rear wheel. The result indicates that pedaling on the asymmetric chainring prototype is more efficient and lighter than circular chainring. This work can be used as a guidance procedure to design any asymmetric chainring from the experimental data.

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Abbreviations

N :

Number of teeth

S :

Total arch length

p :

Chain pitch

dt :

Net torque data

mv :

Multiplier value

L n :

Distance between two points in segment “n”

S n :

Slope on point “n”

f n (x) :

Shape equation of segment “n”

a 0, a 1, a 2, a 3 :

Unknown parameters in the shape equation

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Acknowledgments

This work was supported by the Ministry of Science and Technology of the ROC [grant number MOST 109-2221-E-150-011]. Prototyping was supported by SAMOX Company.

Author information

Authors and Affiliations

  1. Department of Power Mechanical Engineering, National Formosa University, Yunlin, 63201, Taiwan

    Ardi Lesmawanto & Shinn-Liang Chang

  2. Mechanical Engineering Department, University of Muhammadiyah Malang, Malang, 65144, Indonesia

    Ardi Lesmawanto

  3. Office of Physical Education, National Formosa University, Yunlin, 63201, Taiwan

    Kao-Kuei Hsu

Authors
  1. Ardi Lesmawanto
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  2. Kao-Kuei Hsu
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  3. Shinn-Liang Chang
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Corresponding author

Correspondence to Shinn-Liang Chang.

Additional information

Ardi Lesmawanto is a Ph.D. candidate in Department of Power Mechanical Engineering, National Formosa University, Taiwan. He also a lecturer in Mechanical Engineering Department, University of Muhammadiyah Malang, Indonesia. His research interests include noncircular sprocket design, and grinding wheel applications in cutting tools.

Kao-Kuei Hsu is a lecturer and instructor in Office of Physical Education, National Formosa University, Taiwan. His research interests include basketball, swimming, sport injuries, and exercise physiology.

Shinn-Liang Chang is a Professor in Department of Power Mechanical Engineering, National Formosa University, Taiwan. He received his Ph.D. from National Chiao Tung University. His research interests include mechanism, gear principle and application, cutting tool design and manufacturing.

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Lesmawanto, A., Hsu, KK. & Chang, SL. Generation method of asymmetric chainring design from pedaling torque experimental data. J Mech Sci Technol 36, 6115–6122 (2022). https://doi.org/10.1007/s12206-022-1126-2

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  • DOI: https://doi.org/10.1007/s12206-022-1126-2

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