Bicycle Rear Derailleur Fixing Assembly Vibration Control
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Solution Overview
Problem
Bicycle rear derailleurs experience unwanted gear shifting and chain displacement due to vibration and shaking while riding on bumpy roads, leading to inefficiencies in gear switching and potential chain loss from the rear cassette.
Innovation Solution
A fixing assembly for bicycle rear derailleurs that includes a mount seat, fastener, and resistance applying components, where a resistance controlling component is used to adjust the position of the resistance applying components to increase rotational resistance, thereby stabilizing the derailleur and preventing unwanted gear shifts and chain loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rear derailleur is mounted on the bicycle frame without resistance control, then the mounting structure is simple and easy to assemble, but the derailleur experiences vibration and shaking on bumpy roads causing unwanted gear shifting and chain displacement
Solution Approach 1:
The mounting structure transitions from a static fixed position to a dynamic adjustable position. The resistance applying component can be moved along the fastener to adjust the resistance force, allowing the system to adapt to different road conditions and derailleur positions, thereby improving stability without excessive complexity
Solution Approach 2:
The resistance force parameter is made adjustable through the resistance controlling component. By changing the position of the resistance applying component along the fastener, the resistance force can be optimized to different values, allowing the derailleur to maintain stable gear shifting under varying vibration conditions
2Object-affected harmful factors
If resistance applying components are added to the mounting structure, then vibration and shaking are reduced preventing unwanted gear shifts, but the device complexity increases
Solution Approach 1:
The resistance applying component acts as an intermediary between the fastener and the derailleur mounting. It provides a controlled resistance force that dampens vibration and shaking without requiring a completely complex mounting structure. The component is movably disposed on the fastener, adding minimal complexity while effectively reducing harmful vibrations
Solution Approach 2:
Instead of making the entire mounting structure complex, the resistance applying component is localized at specific positions along the fastener. The component can be positioned at different locations to provide resistance force where it is most needed, reducing vibration at critical points without adding complexity throughout the entire structure
3Reliability
If the resistance applying component is positioned to increase resistance force, then the derailleur is stabilized against vibration, but the ease of operation for angle adjustments and wheel removal decreases
Solution Approach 1:
The resistance force is made dynamically adjustable rather than fixed. The resistance applying component can be moved along the fastener to different positions, allowing the user to increase resistance for stability during riding, and decrease resistance when angle adjustments or wheel removal is needed, thus resolving the contradiction between stability and ease of operation
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 reduces vibration and shaking of the bicycle rear derailleur, preventing unwanted gear shifts and chain displacement, while allowing for easier angle adjustments and rear wheel removal.
Implementation Method 1
the resistance controlling component is movable towards the threaded portion of the fastener along an axial direction of the fastener so as to force the resistance applying component to radially move outwards to press against the annular inner surface of the mount seat
Data Source
AI summary
The disclosure provides a fixing assembly for a bicycle rear derailleur including a mount seat, a fastener, a resistance applying component and a resistance controlling component. The mount seat has a through hole and an annular inner surface forming the through hole. The fastener is disposed through the through hole. The fastener has a threaded portion and a recess. The threaded portion is configured to be screwed into a bicycle frame to fix the mount seat. The resistance applying component is disposed on the fastener and located between the annular inner surface and the recess. The resistance controlling component is disposed on the recess of the fastener, and the resistance controlling component is movable towards the threaded portion along an axial direction of the fastener so as to force the resistance applying component to radially move outwards to press against the annular inner surface of the mount seat.