Innovative Pedal Design Using a Double Rocker Mechanism: An Analysis of Link Length Suitability Across Rider Heights
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Innovative Pedal Design, Double Rocker Mechanism, SuitabilityAbstract
This study explores the transmission performance of a novel tricycle pedal mechanism based on
an adjustable Double Rocker Mechanism (DRM), designed to enhance mechanical efficiency across a range
of rider anthropometries. Conventional crank-based tricycle systems often fail to accommodate user height
variation effectively, leading to suboptimal torque transfer and increased discomfort. To address this
challenge, the proposed DRM allows independent adjustment of both input and output link lengths, tailored
to individual rider dimensions. The relationship between link geometry, transmission angles, and
anthropometric parameters was evaluated using the Bee Algorithm, a bio-inspired optimization method
well-suited for multidimensional design problems. Constraints were introduced to ensure biomechanical
efficiency and mechanical feasibility. Results indicate that appropriate link length adjustments significantly
improve transmission angles and overall pedaling performance across various rider heights. The proposed
mechanism thus enables a single tricycle platform to serve a broader user population without compromising
mechanical advantage, comfort, or energy efficiency.
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