Hand-Foot Compound Bicycle Double Ratchet Steering Interference
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Solution Overview
Problem
Conventional bicycles have complex structures that restrict speed and exercising efficiency, with unnatural arm movements and interlocked pedals causing steering issues when handle power is used to drive the bicycle.
Innovation Solution
A hand-foot compound bicycle with a double ratchet system, featuring a handle assembly, pedal assembly, and power transfer unit that allows independent rotation of ratchets to transfer handle and pedal power efficiently to the rear wheel without affecting steering, using bevel gears and universal joints for power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pedals are interlocked to rotate together, then structural simplicity is improved, but steering control deteriorates when handle power is used
Solution Approach 1:
The pedal assembly is segmented into left and right pedals that can rotate independently around the pedal shaft, rather than being rigidly connected. This segmentation allows the pedals to move separately, preventing interference with steering when handle power is applied while maintaining structural simplicity.
2Productivity
If handle and pedal powers are combined to drive the bicycle, then exercising effect and speed are improved, but power transfer stability deteriorates
Solution Approach 1:
A one-way clutch mechanism is introduced as an intermediary between the pedal crank and the rear wheel. This mediator allows power from either the handle or pedal to be transferred to the rear wheel independently, ensuring stable power transfer even when both handle and pedal powers are combined, while maintaining high exercising effect.
3Ease of manufacture
If conventional bicycle structure is used, then ease of manufacture is improved, but running speed and exercising efficiency deteriorate
Solution Approach 1:
The pedal shaft is designed to serve multiple functions: it acts as both the rotation axis for the pedals and as a power transmission shaft to the rear wheel. This multi-functionality allows the bicycle to achieve higher speed and exercising efficiency while maintaining ease of manufacture by avoiding additional complex components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables stable and efficient power transfer, enhancing exercising effects and speed while maintaining natural arm and leg movements, and preventing steering interference during handle operation.
Implementation Method 1
a first ratchet engaged with the lower gear and rotating, a spindle penetrating the lower gear and the first ratchet and rotating independently of the lower gear and the first ratchet
Data Source
AI summary
Disclosed is a hand-foot compound bicycle with a double ratchet, which comprises a handle assembly which comprises a crank handle for generating handle power, and an upper gear to be rotated by rotation of the crank handle; a pedal assembly which comprises a pedal for generating pedal power, and transfers both or either one of the handle power and the pedal power to a rear wheel; and a power transfer unit which comprises a first power transfer gear corresponding to the upper gear, and a second power transfer gear for transferring the handle power from the first power transfer gear to the pedal assembly.