Chain Guide Assembly with Segmented Resistance Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional bicycle derailleurs experience decreased transmission efficiency and chain slippage when riding on bumpy roads due to unwanted chain guide pivoting, which can lead to the chain falling off the sprocket.
Innovation Solution
A chain guide assembly with a resistance applying assembly that includes a shaft seat, first and second engagement components, and a control component, allowing unidirectional engagement and detachment to prevent unwanted pivoting, utilizing a torsion spring for tension maintenance and smooth shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resistance applying component is added to prevent unwanted chain guide pivoting, then chain stability is improved, but device complexity increases
Solution Approach 1:
The resistance applying component is segmented into multiple independent elements: a first engagement component (ratchet wheel) with teeth, second engagement components (pawls) that engage with the teeth, and a control component. This segmentation allows each element to perform a specific function while collectively providing bidirectional resistance control.
Solution Approach 2:
The resistance applying component transitions from a static structure to a dynamic system where the control component can move between engaged and disengaged positions. This allows the resistance to be applied or released based on operational needs, enabling adaptive control of chain guide pivoting resistance during different riding conditions.
2Reliability
If unidirectional engagement is used to prevent chain slippage, then chain tension is maintained, but shifting smoothness may be compromised
Solution Approach 1:
The engagement components are designed to engage and disengage periodically during chain shifting operations. The control component moves between engaged and disengaged states in a periodic manner, allowing the chain guide to be restrained during normal operation and freely movable during shifting, creating a rhythmic engagement pattern that maintains both tension and smoothness.
Solution Approach 2:
The second engagement components (pawls) act as intermediaries between the control component and the first engagement component (ratchet wheel). These intermediary elements transmit the control component's movement to engage or disengage the resistance, providing a mechanical mediation that smooths the transition between engaged and disengaged states.
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
Prevents chain slippage and maintains smooth shifting by providing controlled resistance to counteract external forces, ensuring the chain remains tensioned and securely on the sprocket during bumpy rides.
Implementation Method 1
there is a torsion spring disposed between the movable member and the chain guide for keeping the tension in the bicycle chain
Data Source
AI summary
The disclosure provides a chain guide assembly including a movable member, a chain guide and a resistance applying assembly. The chain guide is pivotably disposed on the movable member. The resistance applying assembly includes a shaft seat, a first engagement component, a control component and a second engagement component. The shaft seat includes a seat portion and a flange portion. The seat portion is fixed on the chain guide. The flange portion is located at a side of the seat portion away from the chain guide and protrudes from the seat portion. The seat portion is disposed through the first engagement component. The first engagement component is clamped by the flange portion and the chain guide. The control component is disposed on the movable member. The second engagement component is pivotably disposed on the movable member and movable with the control component.