Monolithic Bicycle Cogset Mounting for Precise Rear Shifting
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Solution Overview
Problem
Modern bicycle gearshifts with a high number of sprockets face challenges in mounting small sprockets with low teeth counts due to size constraints, leading to reduced flexibility in gear ratio selection and compromised solidity and precision of actuation.
Innovation Solution
A cogset with a monolithic set of axially adjacent sprockets, where at least three sprockets are fixedly connected to form a group, allowing direct engagement on a coupling profile of the sprocket-carrying body, ensuring high solidity and rigidity of coupling, and enabling precise gearshift actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of sprockets is increased to provide more gear ratios, then the versatility of the bicycle is improved, but the size constraints on small sprockets compromise the solidity and precision of actuation
Solution Approach 1:
The patent combines multiple small-diameter sprockets (with 9, 10, or 11 teeth) into a single monolithic set that is fixedly connected as one piece. This merged structure allows the small sprockets to be mounted directly on the sprocket-carrying body while maintaining high solidity and precision, resolving the contradiction between versatility (more gear ratios) and reliability (actuation precision).
2Adaptability or versatility
If small sprockets with low teeth counts are used to increase gear ratios, then the versatility is improved, but the mounting solidity is compromised due to size constraints
Solution Approach 1:
Multiple small sprockets are merged into a monolithic set with a single mounting interface, allowing them to be securely attached to the sprocket-carrying body despite their small individual sizes. This resolves the contradiction between versatility (low teeth count) and strength (mounting solidity).
Solution Approach 2:
The cogset is segmented into two functional groups: small-diameter sprockets (9-11 teeth) that are fixedly connected in a monolithic set, and larger-diameter sprockets that are independently mounted. This segmentation allows each group to be optimized for its specific function while maintaining overall system reliability.
3Reliability
If sprockets are fixedly connected to form a monolithic set, then the mounting solidity is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple sprockets into a single monolithic set that engages with the sprocket-carrying body through one coupling profile. This approach improves mounting solidity while actually simplifying the device complexity compared to independently mounting each small sprocket, as it reduces the number of separate mounting operations and coupling interfaces required.
Data Source
AI summary
A cogset with a plurality of sprockets has a subset of the sprockets connected together in a monolithic subset that is mounted directly in engagement with a coupling profile on the radially peripheral surface of a sprocket in the monolithic subset. The direct shape coupling between the sprocket of the monolithic subset and the sprocket-carrying body makes it possible to have very high solidity and rigidity of coupling to ensure the maximum precision of actuation of the gearshift that uses the sub-assembly.