Kinematics and kinetics of a non-circular bicycle drive system

Han, Ray P. S.; Thomlinson, M.; Tu, Yu

doi:10.1016/0094-114x(91)90009-s

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…In theory, noncircular chainrings have the potential to enhance cycling performance due to smoother fluctuations in crank angular velocity and reductions in internal work 14,21 . However, future research may look at the design of the noncircular chainring with the purpose of optimizing the section of crank revolution of the major axis of the chainring.…”

Section: Future Researchmentioning

confidence: 99%

“…Generally, the studies describing noncircular chainrings aimed to determine an optimal major to minor axis with focus on reducing joint moments 14,21 or crank torque 31 for a set workload level or increasing maximal power output for a set distance or time of exercise 32 . One study reported no substantial difference between a circular and a noncircular chainring aim-ing to increase the axis at the 12 o'clock position on joint moments (similar to Figure 1) 14 .…”

Section: Effects Of Changing Pedal To Crank Interface or Using Noncirmentioning

confidence: 99%

“…However, due to mechanical and anatomical constraints, the effective force is hardly ever constant, which suggests that the moment arm of the crank would change throughout crank revolution to maximize crank torque. With this in mind, changes in crank length 8,9 , pedal to crank interface 10,11 , and in the regular profile of the chainring have been devised (Figure 1) [12][13][14] . Even with strong theoretical support, some of these novel devices uncertainly affect biomechanical, physiological or performance variables [15][16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sistemas de pedivela não-circulares e interfaces pedal-pedivela no ciclismo: uma revisão da literatura.

Bini

Dagnese

2012

Rev. Bras. Cineantropom. Desempenho Hum.

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-Noncircular chainrings and novel pedal to crank interfaces have been designed to optimize variables related to cycling performance (e.g. peak crank torque and efficiency), with conflicting results in terms of performance. Therefore, the aim of the present article was to review the theoretical background of noncircular chainrings and novel pedal to crank interfaces and their effects on biomechanical, physiological and performance variables. Reducing internal work, crank peak torque, and time spent at the top and bottom dead centres (12 o' clock and 6 o' clock positions, respectively) were among the various targets of noncircular chainrings and novel pedal to crank interface design. Changes in joint kinematics without effects on muscle activation were observed when cyclists were assessed using noncircular chainrings and novel pedal to crank interfaces. Conflicting results for economy/efficiency explain the unclear effects of noncircular chainrings on cycling performance and the positive effects of some novel pedal to crank interfaces on cycling economy/efficiency. Key words: Efficiency; Electromyography; Kinematics; Performance. Resumo -Sistemas de coroas não circulares e novas interfaces entre o pedal e o pedivela vem sendo propostas com o objetivo de otimizar variaveis relacionadas com o desempenho

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Section: Future Researchmentioning

confidence: 99%