Foldable Rotary Arm Structure for Bicycle Gyro Balance
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Solution Overview
Problem
Existing foldable bicycle designs face challenges in minimizing space occupation and weight distribution, particularly with gyro balance devices on light frames, where the arrangement of batteries and flywheels increases mass and volume, making them impractical for normal riding and portability.
Innovation Solution
A foldable rotating arm structure for bicycles, where the rotating wheel and crossbar are coaxial or surrounding, allowing the rotating arm to be manually or electrically folded and attached to the transverse pipe, reducing radial space and incorporating a movable wheel for synchronous linkage folding, with a motor-driven transmission system to optimize space utilization and balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flywheel is placed on the transverse pipe for gyro balance, then balance function is achieved, but the volume is large and interferes with normal riding
Solution Approach 1:
The rotating arm is nested within the transverse pipe structure, allowing the balance mechanism to be contained within the existing frame geometry rather than adding external volume. The rotating arm can be folded along the transverse pipe when not in use, effectively nesting the balance component within the bicycle's existing structure.
Solution Approach 2:
The rotating arm is designed to be dynamically adjustable between folded and unfolded states. When folding is required for normal riding, the rotating arm can be rotated to a folded position where it aligns with the transverse pipe, reducing its radial projection and eliminating interference with the rider.
2Reliability
If battery is arranged in storage battery frame surrounding driving motor, then counterweight function is achieved, but the frame structure cannot be folded and radial space cannot be reduced
Solution Approach 1:
The rotating arm incorporating the battery is designed to be dynamically foldable. When the bicycle needs to be transported or stored, the rotating arm can be folded to reduce its radial space occupation. The battery maintains its counterweight function when the arm is unfolded for operation, but the folded state minimizes space requirements.
Solution Approach 2:
The rotating arm serves multiple functions: it provides counterweight for balance, contains the battery for power supply, and can be folded to reduce space occupation. This multi-functional design eliminates the need for separate structures for each function, optimizing the use of available space within the bicycle frame.
3Reliability
If rotating arm is unfolded for balance, then balance torque is improved, but radial space occupation increases and interferes with manual riding
Solution Approach 1:
The rotating arm is designed with dynamic folding capability, allowing it to transition between unfolded (for balance torque) and folded (for riding convenience) states. The arm can be rotated along its axis to achieve the folded position where it aligns with the transverse pipe, eliminating interference with the rider's legs and pedals while maintaining the ability to provide balance torque when needed.
4Reliability
If multiple rotating arms are used for better balance, then balance performance is improved, but device complexity and space occupation increase
Solution Approach 1:
Multiple rotating arms are merged into a single integrated structure that rotates together as one unit. The multiple arms share a common rotation axis and are connected through the transverse pipe, allowing them to function collectively for balance while reducing the number of independent mechanisms required. This integration simplifies the overall structure compared to having separate, independently controlled rotating arms.
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
The solution reduces the radial and axial space occupied, enhances portability, and improves balance torque by distributing mass effectively, facilitating rapid starting and maintaining balance while minimizing weight asymmetry.
Implementation Method 1
the centrifugal force when the rotating arm rotates, or the manual or folding motor drives the movable wheel to slide relative to the transverse pipe, so as to realize synchronous linkage folding or unfolding or steering of the plurality of rotating arms
Data Source
AI summary
A foldable rotary arm structure and device for a bicycle. The foldable rotary arm structure includes a rotary wheel and a rotary arm. The rotary wheel is coaxial with a transverse tube or surrounds the transverse tube. The rotary arm is in steering connection with the rotary wheel or a supporting base, such that the rotary arm is attached to the transverse tube when folded, thereby reducing the space of the transverse tube occupied in a radial direction. A flywheel for use in a balancing device of a bicycle or a motor-assisted bicycle or an amusement device is provided. In the rotary arm, individual batteries or multistage batteries are arranged in a single layer in the radial direction and are stacked in multiple stages in the axial direction. When the rotary arm is unfolded and rotated, the angular momentum is increased or the torque is balanced.