Bicycle Derailleur Chain Guide Rotation Resistance
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Solution Overview
Problem
Bicycle derailleurs face issues with chain slack due to rotational movement during rough riding, which existing motion resisting structures fail to adequately address, leading to undesirable chain slack and shifting problems.
Innovation Solution
A bicycle derailleur with a resistance control element that applies varying resistance to the chain guide through a one-way clutch and friction applying member, allowing for adjustable resistance to rotational movement, preventing counterclockwise rotation and maintaining chain tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a one-way clutch is used to prevent counterclockwise rotation of the chain guide, then chain slack is prevented, but the device complexity increases
Solution Approach 1:
A one-way clutch is introduced as an intermediary component between the chain guide and the movable member. The clutch includes an inner member coupled to the chain guide and an outer member coupled to the movable member, with one-way bearing elements that allow clockwise rotation but prevent counterclockwise rotation. This intermediary device resolves the contradiction by providing reliable chain tension control while maintaining a relatively simple structural integration.
2Reliability
If a resistance applying member is added to apply friction resistance to the one-way clutch, then rotational resistance is improved, but the device complexity increases
Solution Approach 1:
The resistance applying member is merged with the existing one-way clutch structure. The resistance applying member includes a friction element that contacts the outer member of the one-way clutch, and both components are integrated within the same housing structure. This merging approach provides improved rotational resistance while minimizing the increase in device complexity by combining multiple functions into a unified structural arrangement.
3Adaptability or versatility
If a resistance control element is added to adjust the resistance applied to the chain guide, then adaptability is improved, but the device complexity increases
Solution Approach 1:
The resistance control element introduces dynamic adjustability to the system. It includes a control member that can be manually operated to vary the position of the resistance applying member, thereby adjusting the friction resistance applied to the one-way clutch. This dynamic control mechanism provides adaptability for different riding conditions while maintaining a relatively compact and integrated structure that limits complexity increases.
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 solution effectively prevents chain slack and shifting issues during rough riding by providing adjustable resistance, ensuring consistent chain tension and improved shifting performance.
Implementation Method 1
A one-way clutch applies resistance to rotational movement of the chain guide in a predetermined direction. The one-way clutch comprises an inner member and an outer member, wherein the inner member is disposed radially inwardly of the outer member and rotates with the chain guide.
Implementation Method 2
A resistance applying member engages the outer member, and the resistance control element causes the resistance applying member to apply resistance to the outer member when the resistance control element is operated.
Data Source
AI summary
A bicycle derailleur comprises a base member, a movable member movably coupled to the base member, and a chain guide coupled to the movable member for rotation around a rotational axis. A resistance applying element applies resistance to rotational movement of the chain guide, and a resistance control element moves between at least different first and second positions. The resistance control element is operatively coupled to the resistance applying element so that the resistance applying element applies different first and second resistances to rotational movement of the chain guide when the resistance control element is disposed in the respective first and second positions.