Bicycle Frame Unit With Internal Reinforcing Panels
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Solution Overview
Problem
The existing frame units for bicycles face issues with residual stress and rigidity deterioration due to welding heat, leading to safety concerns like cracks and damage, poor design freedom, and aesthetic issues from protruding weld beads, along with inefficiencies in welding quality and productivity.
Innovation Solution
The integration of left and right frame bodies with reinforcing panels internally, which are press-formed and welded along edges, eliminating external welds and enhancing rigidity and durability, while reducing weight and improving aesthetics through automated welding.
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 due to welding heat
Solution Approach 1:
The frame is divided into multiple components (head tube, seat tube, frame, stays) that are joined through a welding process. The segmentation allows for modular assembly while the welding process creates strong joints, though residual stress and cracks occur at these joining portions due to the thermal effects of welding.
2Ease of manufacture
If manual welding is performed, then joining flexibility is improved, but welding quality varies and productivity deteriorates
Solution Approach 1:
The welding process is designed to be performed by skilled workers who can adapt to different frame configurations and joining requirements. The manual welding approach allows for flexibility in joining various frame components while the skill level of workers and working conditions directly influence welding quality and productivity.
3Strength
If reinforce elements are provided externally, then rigidity is improved, but design freedom and aesthetic appearance deteriorate
Solution Approach 1:
The reinforcing elements are nested within the frame structure rather than being attached externally. The reinforcing elements are positioned inside the frame tubes and components, providing the necessary rigidity and strength while maintaining a clean, smooth external appearance and preserving design freedom.
4Strength
If weld beads protrude at joining portions, then joining strength is improved, but aesthetic appearance deteriorates due to heterogeneity
Solution Approach 1:
The welding process is optimized to create joints with appropriate local properties. The weld beads are controlled to provide sufficient joining strength at the critical joining portions while minimizing protrusions that would affect aesthetic appearance. The local quality of the welds is optimized to balance functional requirements with visual appearance.
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 effectively removes residual stress, enhances rigidity and durability, improves safety, and automates the welding process, resulting in a more aesthetically pleasing and productive frame unit with reduced weight and improved design freedom.
Implementation Method 1
when the head tube 101, the seat tube 103, the upper frame 105, the lower frame 107, and the upper and lower stays 109 and 111 are joined to each other by a welding process
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 panel disposed within the left and right frame bodies, wherein the left frame body and the right frame body may be coupled so as to integrally form the head tube, the seat tube, and the frame.