Exhaust Coupler Braid Cover Axial Growth Constraint
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Solution Overview
Problem
Automotive exhaust couplers face challenges in absorbing vibrations and misalignment due to limited flexibility and compressibility, leading to potential damage from excessive extension or compression, which results in premature failure.
Innovation Solution
The coupler design incorporates a flexible bellows member with an axially extendable and contractible interlock member and a braid cover that constrains radial expansion or contraction, limiting excessive extension or compression, while an inner braid member provides additional resistance to compression, ensuring the coupler's components are not overstretched or compressed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the coupler is designed with high flexibility and compressibility to absorb vibrations and misalignment, then the coupler can better accommodate movement and thermal changes, but the interlock hose member may become broken or damaged due to excessive extension or compression
Solution Approach 1:
The braid cover's geometric parameters are specifically designed so that its circumference constricts radially as its length extends axially. This parameter relationship creates a self-limiting mechanism where the cover becomes constricted against the bellows member at maximum extension, preventing excessive stretching that would damage the interlock hose member while maintaining the needed flexibility for normal operation
Solution Approach 2:
The braid cover acts as a preventive constraint that limits the range of motion before damage can occur. By designing the cover with specific braid angles and wire filament configurations, the system pre-establishes mechanical limits that cushion against over-extension and over-compression, protecting the interlock hose member from premature failure
2Reliability
If the outer braid cover is designed to limit axial extension by radial constriction, then the interlock member is protected from over-extension, but the coupler's overall flexibility is reduced
Solution Approach 1:
The braid cover exhibits different mechanical properties in different directions: it provides strong radial constriction when subjected to axial extension (protecting against over-stretching), while maintaining sufficient axial flexibility for normal compression and vibration absorption. The local geometric configuration of the braided wires creates direction-dependent behavior that simultaneously achieves protection and flexibility
Solution Approach 2:
The braid cover's mechanical response is dynamic rather than static. Under normal operating conditions, the cover allows flexible compression and vibration absorption. When extension approaches the limit, the radial constriction mechanism activates dynamically to prevent over-extension, creating a progressive response that adapts to the applied loads
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 enhances the coupler's flexibility and compressibility, preventing premature failure by restricting axial growth and compression, thereby maintaining the integrity of the interlock and bellows members during vehicle movement and thermal changes.
Implementation Method 1
the outer braid cover, by its nature, cannot extend or compress without changing diameter. The outer braid cover includes a cross-sectional circumference and an axial length and is constructed such that its circumference constricts radially as its length is extended axially.
Implementation Method 2
When the coupler is compressed in length axially, the inner braid member expands radially and becomes pressed against the interior of the interlock member.
Data Source
AI summary
An exhaust connection coupler and a method for manufacturing the same are provided. The coupler may include a bellows member, an interlock member disposed within the bellows member and an outer braid cover surrounding the bellows member. The braid cover is designed such that it provides resistance limiting axial growth of the coupler, so that the interlock member is not extended to an excessive length, while enabling maximized compression and angular flexibility. The outer braid cover may be constructed of intertwined bundles of wire filaments disposed at a specified angle from a central axis of the coupler. As assembled, the interlock member is at a nearly fully extended length when the bellows member is at an uncompressed and unextended length in order to maximize the amount in which the coupler may be compressed and/or flexed during installation and use.