Bicycle Frame Unit with Reinforcing Stays for Stress Reduction
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Solution Overview
Problem
The existing frame units for bicycles face issues with residual stress and safety due to welding heat, leading to potential cracks and damage, and have limitations in design freedom and aesthetic appeal due to manual welding and protruding weld beads.
Innovation Solution
The integration of reinforcing stays with thicker, more rigid material, coupled along inner edges of the frame bodies, and the use of press-forming and welding to form the frame components without external joining portions, reducing residual stress and enhancing rigidity and design freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding process is used to join frame components, then joining strength is improved, but residual stress and cracks occur reducing safety
Solution Approach 1:
The frame is divided into modular components (head tube, seat tube, frame body, stays) that are separately manufactured and then joined. This segmentation allows for controlled welding at specific joining portions while maintaining overall structural integrity and safety.
Solution Approach 2:
Reinforce elements are selectively applied at specific joining portions where welding occurs. These local reinforcements compensate for residual stress and prevent crack propagation at critical areas, maintaining safety while preserving the benefits of welding.
2Ease of operation
If manual welding is performed for joining portions, then flexibility in assembly is improved, but productivity deteriorates due to excessive working time
Solution Approach 1:
Frame components are pre-manufactured with standardized joining portions and reinforce elements already in place. This preliminary preparation enables faster assembly and welding operations, improving productivity while maintaining assembly flexibility through standardized interfaces.
3Strength
If reinforce elements are provided externally for joining portions, then rigidity for safety is improved, but design freedom deteriorates
Solution Approach 1:
The reinforce elements are integrated into the frame structure by forming them as integral parts of the frame components during manufacturing. This merging eliminates the need for separate external reinforcements, maintaining rigidity while achieving a cleaner, more aesthetically pleasing design with unified appearance.
4Strength
If welding is performed at joining portions, then structural integrity is improved, but aesthetic appearance deteriorates due to protruding weld beads
Solution Approach 1:
Reinforce elements are strategically positioned at joining portions to provide structural reinforcement while being concealed or integrated into the frame design. This local reinforcement approach maintains structural integrity while preserving aesthetic appearance by hiding weld beads and reinforcement features.
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
This solution eliminates residual stress-related issues, improves safety by maintaining rigidity under impact loads, and enhances the aesthetic appeal of the bicycle frame while automating the welding process, reducing working time and improving productivity.
Implementation Method 1
press-forming a left frame body in which a part of a head tube, a part of a seat tube, a part of a frame configured to integrally connect the head tube and the seat tube and form a body of a bicycle, and a left stay are integrally formed
Implementation Method 2
the left and right frame bodies are joined to each other along edges of the left and right frame bodies
Data Source
AI summary
A frame unit for a bicycle may include a left frame body in which a part of a seat tube, a part of a frame, and a left stay are integrally formed, a right frame body in which a part of the seat tube, a part of the frame, and a right stay are integrally formed, and a reinforcing stay coupled to inner sides of the left and right stays respectively, wherein the left frame body and the right frame body may be joined to each other along edges of the left and right frame bodies so as to integrally form the head tube, the seat tube, and the frame.