Integrated Bicycle Stem-Handlebar Forging to Cut Weight and Loosening
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Solution Overview
Problem
The conventional assembly method for bicycle stems and handlebars, which relies on clamping with bolts and a clamp cover, increases weight and cost, and is prone to loosening, requiring frequent maintenance and affecting performance in competitions.
Innovation Solution
A method for integrally forming a bicycle stem and handlebars through casting, hot forging, and punch forging to create a solid, lightweight structure with reduced components, enhancing sturdiness and reducing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional assembly method using stem clamp and clamp cover with bolts is used, then the handlebars can be securely clamped, but the overall weight and cost of the bicycle increases
Solution Approach 1:
The patent merges the stem and handlebars into a single integrally formed component through hot forging. The mold cavity includes a first section for the stem blank and two second sections for handlebar blanks, which are forged simultaneously to create a unified structure with continuous metal grain flow, eliminating the need for separate clamping components and reducing overall weight.
Solution Approach 2:
The invention extracts and eliminates unnecessary components from the conventional assembly system. By removing the stem clamp, clamp cover, and multiple bolts, the design achieves weight reduction while maintaining structural integrity through the integrally formed stem and handlebar combination.
2Reliability
If multiple bolts and clamp components are used to secure handlebars, then the assembly can hold handlebars, but the cost of the bicycle increases
Solution Approach 1:
The patent combines multiple separate components (stem, handlebars, clamp, cover, bolts) into a single integrally formed piece through hot forging. This merging process reduces the total number of parts, simplifies manufacturing operations, and lowers material and assembly costs while maintaining secure attachment.
Solution Approach 2:
The invention removes unnecessary components from the conventional assembly system. By extracting the stem clamp, clamp cover, and multiple bolts, the design achieves cost reduction through fewer materials and simplified manufacturing processes while maintaining structural security.
3Ease of manufacture
If the conventional clamping assembly is used, then the stem and handlebars can be assembled, but the number of parts increases weight and complexity
Solution Approach 1:
The patent merges multiple components (stem, handlebars, clamp, cover, bolts) into a single integrally formed piece through hot forging. The mold cavity design with a first section and two second sections enables simultaneous formation of all components, reducing part count and complexity while maintaining assembly capability.
Solution Approach 2:
The invention extracts and eliminates unnecessary components from the conventional assembly system. By removing the stem clamp, clamp cover, and multiple bolts, the design achieves reduced complexity and fewer parts while maintaining the essential function of supporting handlebars.
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 integrally formed stem and handlebars provide improved impact resistance, shock resistance, and stress endurance, reducing weight and cost while minimizing maintenance needs.
Implementation Method 1
Processing the mold containing the metal billet so that the metal billet is shaped in the mold cavity, after shaping, the metal billet forming a stem part and two handlebar parts, the stem part and the two handlebar parts are both solid and integrally formed
Implementation Method 2
Using two punch parts of a punching device aligned with the two punch openings of the mold, inserting the two punch parts into the mold cavity through the corresponding punch openings to punch the ends of the two handlebar parts so as to form an end hole
Data Source
AI summary
A method for integrally forming a bicycle stem and handlebars includes the following steps: material preparation (S1), pre-processing (S2), initial forging (S3), punch forging (S4), and processing and finishing (S5). By making the stem part 101 solid internally and integrally forming it with the two handlebar parts (102), the overall weight and cost are significantly reduced. The integrated stem part (101) and two handlebar parts (102) allow the solid interior of the stem part (101) to withstand greater external forces. The method greatly reduces the assembly steps, thereby speeding up assembly time. The method improves issues of the conventional technology, which requires additional components to combine the stem and handlebars, thereby increasing overall weight. The present invention addresses the issue of the structure being unable to withstand external forces due to excessive hollow parts inside, which could lead to deformation.