Bicycle Chainstay Protector with Segmented Peaks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bicycle chainstay protectors often produce an undesirable loud slapping sound due to chain oscillation over uneven terrain, which can cause damage and is not effectively mitigated by existing designs.
Innovation Solution
A chainstay protector with an upper surface featuring a valley and multiple peaks, where the first and second contact surfaces are positioned to absorb the chain's kinetic energy, with a gap between them that is significantly larger than the first height, and made from a combination of materials for enhanced resilience and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a chainstay protector is used to protect the chainstay from damage, then the chainstay is protected from damage, but a loud slapping sound is generated when the chain contacts the protector
Solution Approach 1:
The upper surface of the chainstay protector is segmented into multiple peaks and valleys rather than being flat. This segmentation allows the chain to contact different peaks at different times during oscillation, distributing the impact and reducing the loud slapping sound while maintaining protection functionality
Solution Approach 2:
The peaks are designed with rounded tops and the material is made resilient to provide cushioning before the chain makes full contact. This beforehand cushioning reduces the impact force and the resulting noise while still protecting the chainstay from damage
2Reliability
If the chain contacts the chainstay protector during vertical oscillation, then damage to the chainstay is prevented, but the contact generates undesirable noise
Solution Approach 1:
The protector uses material with specific resilient properties and designs peaks with specific height and spacing parameters. By optimizing these parameters, the protector maintains reliable damage prevention while the material's resilience and the peak geometry reduce noise during chain contact
3Object-generated harmful factors
If a resilient material is used to reduce noise, then noise is reduced, but the structural integrity may be compromised
Solution Approach 1:
The chainstay protector is made from a composite material or a material with composite structure that combines resilience for noise reduction with sufficient strength for structural integrity. The material properties are engineered to provide both noise damping and the necessary mechanical strength to protect the chainstay
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 design effectively reduces the noise generated by the chain impacting the chainstay protector by dissipating kinetic energy, thereby minimizing damage and noise, while maintaining structural integrity and aesthetic appeal.
Implementation Method 1
an upper portion secured to the base portion and defining part of the upper surface. The upper portion comprises a second material that is more resilient than the first material
Implementation Method 2
The upper portion comprises a second material that is more resilient than the first material
Data Source
AI summary
A bicycle includes a chainstay protector having an upper surface including a valley, a first peak, and a second peak. The first peak extends upwardly from the valley toward the chain and has a first contact surface positioned to contact the chain a first height above the valley. The second peak extends upwardly from the valley toward the chain and has a second contact surface positioned to contact the chain a second height above the valley. The first contact surface is spaced from the second contact surface by a gap that is at least 5 times the first height. Each of the first and second contact surfaces has a length that is less than the length of the gap and less than two times a pitch of the chain.