Bicycle Derailleur Chain Guide Rotation Resistance Control
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Solution Overview
Problem
Bicycle derailleurs face issues with chain slack during rough riding due to motion resisting structures not effectively preventing counterclockwise rotation of the chain guide, leading to undesirable slack in the chain.
Innovation Solution
A bicycle derailleur with a resistance applying element, such as a one-way clutch and friction applying member, and a resistance control unit that applies force non-parallel to the rotational axis to maintain resistance to the chain guide's rotational movement, preventing chain slack without manual operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resistance applying unit is added to prevent counterclockwise rotation of the chain guide, then chain tension is improved, but device complexity increases
Solution Approach 1:
The resistance control element is designed to automatically maintain resistance to the chain guide's rotational movement without requiring manual operation. The element applies force non-parallel to the rotational axis to prevent reduction in resistance, enabling the system to self-regulate and maintain chain tension autonomously during rough riding conditions
Solution Approach 2:
The resistance applying element uses a one-way clutch mechanism that allows free rotation in the clockwise direction (chain tensioning) while blocking counterclockwise rotation (resistance to bumps and shocks). This parameter change in rotational freedom selectively maintains chain tension without unnecessarily complicating the entire derailleur system
2Stability of the object's composition
If a resistance control element applies force non-parallel to the rotational axis, then resistance stability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The resistance control element applies force in a non-parallel direction relative to the rotational axis, creating an asymmetric force application pattern. This asymmetric approach ensures that resistance is maintained effectively during counterclockwise rotation (preventing chain slack) while allowing clockwise rotation (chain tensioning) to proceed freely, achieving stability without requiring parallel force application
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 maintains chain tension during both clockwise and counterclockwise rotations, ensuring consistent shifting performance even in rough terrain by applying adjustable resistance to counteract the effects of bumps and shocks.
Implementation Method 1
a resistance applying element that applies resistance to rotational movement of the chain guide
Data Source
AI summary
A bicycle derailleur comprises a base member adapted to be mounted to a bicycle, a movable member movably coupled to the base member, a chain guide coupled to the movable member for rotation around a rotational axis, a resistance applying element that applies resistance to rotational movement of the chain guide, and a resistance control element. The resistance control element applies a force to the resistance applying element in a direction that is non-parallel with the rotational axis, without any manual operations, to prevent a reduction in the resistance to rotational movement of the chain guide applied by the resistance applying element.