Direct-Mount 2X Chainring Assembly for Speed and Clearance
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Solution Overview
Problem
Traditional chainring assemblies face challenges in balancing performance requirements such as speed and vehicle clearance, often necessitating different sizes and configurations that are not easily accommodated by existing designs, which can lead to issues like bending, breaking, and wear, as well as difficulties in maintaining radial alignment for optimal shifting performance.
Innovation Solution
A chainring assembly that employs two separate chainrings held onto one spline using only one fastener, allowing for individual or joint replacement and maintaining radial alignment through stacking or nesting, thereby enhancing torque transfer and reducing central movement, while allowing either chainring to share torque from the other, thus providing a robust and cost-effective solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a larger diameter chainring is used to achieve higher speed, then speed increases, but vehicle clearance decreases
Solution Approach 1:
The chainring system is segmented into two separate chainrings (first chainring and second chainring) with different diameters, allowing the vehicle to switch between them based on terrain and speed requirements. This segmentation enables the system to have both small and large chainrings without compromising clearance, as only one is used at a time.
Solution Approach 2:
The chainring system is made dynamic through the ability to quickly swap between the first and second chainrings based on changing terrain conditions. The quick-release mechanism allows the system to adapt its effective diameter in real-time, optimizing both speed and clearance as needed.
2Ease of manufacture
If traditional single chainring designs are used, then manufacturing is simpler, but adaptability to different terrains and maneuvers is reduced
Solution Approach 1:
The chainring assembly is designed with multi-functionality, where a single assembly can accommodate two different chainring sizes. The assembly includes a first chainring for one type of terrain and a second chainring for another type, making the same mechanical assembly adaptable to multiple riding conditions without requiring completely different designs.
Solution Approach 2:
The second chainring is positioned within the same assembly space as the first chainring, effectively nesting the functionality of two different chainrings into a single assembly footprint. This allows both chainrings to be part of the same mechanical system without significantly increasing overall complexity or manufacturing difficulty.
3Adaptability or versatility
If chainrings are frequently replaced to match different terrains, then terrain-specific performance improves, but maintenance time and complexity increase
Solution Approach 1:
Both the first and second chainrings are pre-installed on the same assembly, ready for immediate use. The quick-release mechanism allows the rider to switch between pre-configured chainrings without requiring complex installation procedures, significantly reducing the time and complexity of maintenance compared to traditional single-chainring systems that require complete removal and reinstallation.
Data Source
AI summary
A cinch direct mount 2X ring system is disclosed. One embodiment discloses a chainring assembly having a drive side crank arm with a chainring assembly interface including a plurality of splines, a circumference, and an axial length. The chainring assembly includes a first chainring having a first outer diameter and a first center assembly shape. The chainring assembly includes a second chainring having a second outer diameter and a second center assembly shape, the second outer diameter being different than the first outer diameter. The chainring assembly also includes a fastener to couple the first chainring and the second chainring with the chainring assembly interface, such that at least one of the first center assembly shape or the second center assembly shape engages with the plurality of splines.