Bicycle Sprocket Driver Layout for Small-Cassette Torque Transfer
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Solution Overview
Problem
Conventional bicycle sprocket drivers require multiple complex and heavy parts to accommodate sprockets with small diameters, leading to mechanical stress and inefficient power flow due to the need for additional components and complex adapter systems.
Innovation Solution
A driver design that eliminates the need for external splines, using an adapter to fix the sprocket assembly axially and radially, allowing for torque transmission spatially away from the coupling section, with a lightweight guide section and concentrated load-bearing areas for improved assembly and power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional drivers with external splines are used to mount sprockets, then torque transmission is achieved, but the system becomes complex and heavy when accommodating small-diameter sprockets
Solution Approach 1:
The driver is divided into functionally distinct sections: a guide section with external splines for torque transmission and a positioning section without splines for axial and radial fixation. This segmentation allows each section to be optimized for its specific function, reducing overall complexity while maintaining versatility for different sprocket sizes
Solution Approach 2:
The spline configuration is extracted from the entire driver and concentrated only in the guide section. The positioning section is freed from splines, allowing for simpler structure and reduced weight while still accommodating various sprocket sizes through the adapter mechanism
2Adaptability or versatility
If adapters are used to fix small-diameter sprockets, then versatility is improved, but weight and complexity increase
Solution Approach 1:
The adapter integrates multiple functions into a single component: it provides axial positioning, radial positioning, and torque transmission through its interaction with the guide section. This merging eliminates the need for separate components, reducing overall weight and complexity
Solution Approach 2:
The adapter is designed as a universal component that can accommodate different sprocket sizes while interfacing with the standardized driver structure. The guide section's external splines provide a universal torque transmission interface that works with various adapter configurations
3Adaptability or versatility
If multiple parts are used to accommodate small sprockets, then adaptability is improved, but assembly difficulty increases
Solution Approach 1:
The guide section with external splines is pre-configured on the driver before the adapter is attached. This preliminary action establishes the torque transmission path in advance, allowing the adapter to be simply slipped into place and secured, greatly simplifying assembly while maintaining versatility
4Adaptability or versatility
If the outer bearing is positioned inward to accommodate adapters, then adaptability is improved, but mechanical stress and power flow efficiency worsen
Solution Approach 1:
The guide section is designed with local quality - it has external splines and is positioned to handle torque transmission and concentrated loads. This allows the bearing to be positioned optimally for strength and power flow, while the guide section's localized spline configuration accommodates the adapter system
Data Source
AI summary
A multiple sprocket arrangement is mountable to a rear axle arrangement of a bicycle. The multiple sprocket arrangement includes a sprocket assembly having a plurality of sprockets with different numbers of teeth. The sprocket assembly includes a support ring integrated with at least a largest sprocket of the plurality of sprockets. The support ring is firmly connected to the remaining sprockets and has a torque transmitting section.