Bicycle Sprocket Axial Offset for Heat Treatment
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Solution Overview
Problem
Sprocket wheels for bicycles are difficult to post-process and further process in a simple and time-saving manner, particularly for mass-produced articles like those made of metal, which require special hardening due to operational forces.
Innovation Solution
A sprocket wheel design featuring axially offset flat areas connected by transitional sections, allowing for stacking and easy handling, centering, and joint heat treatment, with optional gaps between sections to accommodate manufacturing tolerances, enabling efficient processing and increased stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sprocket wheels are designed with conventional single-plane structures, then manufacturing is simpler, but post-processing and heat treatment are time-consuming and difficult
Solution Approach 1:
The sprocket wheel is divided into multiple axially offset sections (first section with first main surface, second section with second main surface) that can be independently positioned. This segmentation allows multiple sprocket wheels to be stacked and processed simultaneously, dramatically improving post-processing and heat treatment efficiency while maintaining manufacturing simplicity through modular design
Solution Approach 2:
The invention transitions from a conventional single-plane sprocket design to a multi-planar structure with axially offset sections. By adding the axial dimension with offset main surfaces, the design enables stacked processing arrangements where multiple sprockets can be heat treated together, resolving the contradiction between manufacturing simplicity and post-processing efficiency
2Ease of operation
If sprocket wheels are processed individually, then handling is straightforward, but processing time increases significantly
Solution Approach 1:
Multiple sprocket wheels are merged into a stacked assembly during post-processing and heat treatment operations. The axially offset main surfaces enable precise alignment and stable stacking, allowing multiple individual processing operations to be combined into a single batch process, thereby reducing total processing time while maintaining ease of handling through unified assembly
3Stability of the object's composition
If axially offset sections are added to increase stability, then structural stiffness improves, but manufacturing complexity increases
Solution Approach 1:
The axially offset sections are strategically positioned at specific locations on the sprocket wheel rather than uniformly distributed. This local quality approach provides structural stability and stacking capability where needed, while keeping other areas simple, thus improving structural stability without proportionally increasing overall manufacturing complexity
Data Source
AI summary
A sprocket wheel for a bicycle includes a first main surface, which is flat in one or more sections, and a second main surface, which is situated opposite the first main surface. The second main surface is flat in one or more sections and extends parallel to the first main surface in one or more sections. The sprocket wheel also has an outer circumferential surface, which connects the first and the second main surface to one another and on which toothing is provided.