Bicycle Chain Axial Protuberance Shifting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bicycle chains face challenges in maintaining holding function and shifting performance between sprockets while minimizing wear, abrasion, and noise, particularly due to interference with sprocket teeth.
Innovation Solution
The bicycle chain design incorporates an axial protuberance that can be made of metallic or resin material, attached via adhesive, diffusion bonding, or integral molding, which protrudes from the inner surface of the first outer link plate, and features inclined surfaces to reduce interference with sprocket teeth, along with chamfers on the link plates to enhance shifting and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an axial protuberance is added to improve holding function, then the chain grip on sprocket teeth is enhanced, but interference with sprocket teeth during shifting increases
Solution Approach 1:
The axial protuberance is provided only on the first outer link plate and not on the second outer link plate, creating asymmetric local features that improve chain holding function while minimizing interference during shifting operations
Solution Approach 2:
The axial protuberance extends in the axial direction from the first inner surface, adding a dimensional feature that enhances grip on sprocket teeth without significantly increasing lateral interference during derailleur-mediated shifting
2Reliability
If the axial protuberance is made as a separate member to allow material selection, then wear and abrasion resistance can be improved by selecting metallic material, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The axial protuberance is designed as a separate member that can be attached to the first outer link plate, allowing independent material selection (e.g., metallic material for enhanced wear resistance) while maintaining modular assembly and reducing overall device complexity
Solution Approach 2:
The axial protuberance can be made from metallic material with different properties than the first outer link plate, creating a composite structure that optimizes wear and abrasion resistance at the contact point while maintaining the base material's properties elsewhere
3Strength
If the axial protuberance is made integrally with the first outer link plate to improve rigidity, then structural strength is enhanced, but manufacturing flexibility and material selection are reduced
Solution Approach 1:
The axial protuberance is designed as a separate attachable member rather than an integral part, enabling material selection flexibility (e.g., metallic material for wear resistance) while maintaining sufficient structural rigidity through proper attachment methods
4Reliability
If conventional chain design is used to maintain simplicity, then ease of manufacture is preserved, but holding function and shifting performance cannot be simultaneously optimized
Solution Approach 1:
The axial protuberance is designed as a separate member that can be attached via simple methods (adhesive, diffusion bonding, or caulking), maintaining ease of manufacture while improving holding function and shifting performance through optimized chain-sprocket interaction
Solution Approach 2:
The axial protuberance modifies the chain's geometric parameters at the critical contact point with sprocket teeth, improving holding function and shifting performance without fundamentally changing the overall chain structure or manufacturing process complexity
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
This design improves the holding function and shifting performance of the bicycle chain, reduces wear and abrasion, and minimizes noise and interference with sprocket teeth, while allowing for material selection and efficient production methods.
Implementation Method 1
The axial protuberance protrudes from the first inner surface of the first intermediate portion in the axial direction... it is possible to improve the holding function of the bicycle chain
Implementation Method 2
the axial protuberance is attached to the first intermediate portion via one of adhesive, diffusion bonding, and caulking
Implementation Method 3
the axial protuberance is attached to the first intermediate portion via one of adhesive, diffusion bonding, and caulking
Implementation Method 4
the axial protuberance is attached to the first intermediate portion via one of adhesive, diffusion bonding, and caulking
Data Source
AI summary
A bicycle chain comprises a first outer link plate, a second outer link plate, and an axial protuberance protruding. The first outer link plate comprises a first end portion, a second end portion, and a first intermediate portion. The second outer link plate comprises a third end portion, a fourth end portion, and a second intermediate portion. The axial protuberance protrudes from a first inner surface of the first intermediate portion in an axial direction. The second intermediate portion of the second outer link plate is free from an axial protuberance protruding from a second inner surface of the second intermediate portion in an axial direction.