Decoupled Velocipede Chainset for Simultaneous Pedal Power
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Solution Overview
Problem
Existing cranksets in bicycles convert only a fraction of the energy applied by cyclists into rotational motion, with one pedal being used passively during the return phase, leading to inefficiency and discomfort.
Innovation Solution
Mechanically decoupling the pedals in a crankset allows independent, simultaneous use of both pedals for energy transmission, utilizing a cable or belt mechanism with freewheeling elements to enhance efficiency and reduce return time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pedals are mechanically coupled in a conventional crankset, then the structure is simple and reliable, but energy conversion efficiency is low and return time is long
Solution Approach 1:
The pedal mechanism is segmented into two independent pedals that can move autonomously without mechanical coupling. Each pedal operates independently with its own return mechanism, allowing simultaneous active movement of both pedals to double the power transmission capability while maintaining simple individual structures
Solution Approach 2:
A return mechanism acts as an intermediary to passively return pedals to their starting positions. This intermediary component enables the pedals to move actively during the power stroke while automatically returning during the recovery stroke, improving efficiency without requiring complex active return mechanisms
2Loss of time
If one pedal is used passively during return phase in conventional cranksets, then the mechanical structure is simple, but the return time is long and comfort is reduced
Solution Approach 1:
The pedal mechanism maintains continuous useful action by enabling both pedals to move actively during their respective power strokes. The return mechanism ensures continuous operation by automatically returning pedals to starting positions without interrupting the active movement of either pedal, thereby reducing total cycle time and improving comfort
3Power
If only one pedal is used at a time in conventional cranksets, then the mechanical coupling is simple, but energy transmission capability is limited
Solution Approach 1:
The invention merges the functionality of two independently operating pedals into a single crankset system. Both pedals can transmit power simultaneously to the same drive mechanism, effectively doubling the power transmission capability while maintaining simple individual pedal structures through the use of a common return mechanism
Data Source
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AI summary
The invention relates to a chainset (1) for a velocipede (10), comprising two pedals (2) which are mobile in translation (T) and mechanically decoupled.