Carbon-Fiber Suspension Fork Assembly With Precise Bonded Alignment
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Solution Overview
Problem
Existing suspension fork assemblies for bicycles lack enhanced mechanical and aerodynamic performance, particularly when made from carbon fiber materials, and require improved methods for assembling and adjusting piston assemblies.
Innovation Solution
A method for assembling a suspension fork assembly using carbon fiber components, involving adhesive bonding of steer tubes, cap inserts, and insert assemblies within a fixture to ensure precise alignment and attachment, along with an aerodynamic profile for the spring and damper assembly tubes to reduce drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional suspension fork assemblies are made from carbon fiber materials, then weight is reduced, but manufacturing complexity and assembly precision requirements increase
Solution Approach 1:
The patent employs preliminary action by pre-aligning components (steer tube, cap inserts, insert assemblies) within a fixture before the adhesive bonding process. This ensures that all components are positioned with the required precision before the adhesive sets, addressing the high assembly precision requirements of carbon fiber suspension forks while maintaining weight reduction benefits
Solution Approach 2:
The patent uses adhesive as an intermediary bonding mechanism to join carbon fiber components. The adhesive allows for precise alignment to be maintained during assembly, while the fixture serves as an intermediary tool to hold components in the correct position during the bonding process, thereby managing the increased manufacturing precision requirements
2Object-affected harmful factors
If aerodynamic profiles are added to spring and damper assembly tubes, then aerodynamic performance is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by implementing aerodynamic profiles specifically on the spring assembly tube and damper assembly tube that are exposed to airflow, while other components maintain their functional designs. This targeted approach reduces aerodynamic drag on the bicycle without unnecessarily complicating the entire suspension fork assembly
Solution Approach 2:
The aerodynamic profiles on the tubes feature asymmetric cross-sections optimized for airflow characteristics, with different shapes at different locations along the tubes. This asymmetric design reduces drag more effectively than symmetric profiles would, while the complexity is managed by applying these profiles only where aerodynamic benefits are most significant
3Strength
If adhesive bonding is used to assemble carbon fiber components, then structural integrity is improved, but assembly time and curing duration increase
Solution Approach 1:
The patent uses preliminary action by preparing the adhesive surfaces and positioning all components within the fixture before applying the adhesive. This pre-positioning ensures that when bonding occurs, the components are already aligned correctly, reducing the overall assembly time while maintaining the structural integrity benefits of adhesive bonding
Solution Approach 2:
The patent replaces traditional mechanical fastening systems (bolts, screws, clips) with adhesive bonding for joining carbon fiber components. This substitution provides superior structural integrity and a cleaner appearance, while the use of fixtures and pre-positioning techniques compensates for the curing time requirement by streamlining the overall assembly process
4Manufacturing precision
If fixtures are used to align components during assembly, then alignment precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent designs the fixture to serve multiple functions: holding the steer tube, cap inserts, and insert assemblies in correct alignment; maintaining precise spacing between components; and facilitating the adhesive bonding process. This multi-functionality reduces the need for multiple specialized fixtures, thereby managing complexity while achieving high alignment precision
Solution Approach 2:
The fixture incorporates precision-machined reference surfaces and alignment features that replicate the desired final geometry of the assembled components. By copying the target configuration into the fixture design, the system achieves high alignment precision without requiring overly complex adjustment mechanisms during assembly
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 method provides a suspension fork assembly with improved mechanical performance, reduced aerodynamic drag, and efficient assembly processes, enhancing the overall functionality and efficiency of the bicycle suspension system.
Implementation Method 1
preparing each insert assembly for bonding with an adhesive bond; applying adhesive to each insert assembly to provide the adhesive bond; installing each insert assembly for the fork
Implementation Method 2
an aerodynamic profile for the spring and damper assembly tubes to reduce drag
Implementation Method 3
the fork may comprise a composite material; the fork and the steer tube comprise a carbon fiber material
Data Source
AI summary
A suspension fork assembly may comprise a fork comprising a steer tube and a spring assembly tube with a cap insert and an insert assembly and a damper assembly tube with a cap insert and an insert assembly and a leg for a spring assembly configured to be fit within the spring assembly tube of the fork and a leg for a damper assembly configured to be fit within the damper assembly tube of the fork; the fork may comprise a composite material such as a carbon-fiber material with components attached by an adhesive bond. The suspension fork assembly may be assembled by a process comprising the step of aligning at least two of the components. The suspension fork assembly may comprise an inverted fork with the leg for the spring assembly inserted within the spring assembly tube and the leg for the damper assembly inserted within the damper assembly tube.