Switchable Adhesion Joint for Non-Destructive Component Detachment
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Solution Overview
Problem
Existing connection systems for motor vehicle components often require destructive detachment, making it difficult to replace damaged parts and recycle components, and they may have visible screw heads or complex assembly processes.
Innovation Solution
A connection system with a switchable adhesion surface using a shape memory alloy that can adjust its adhesiveness, allowing for easy assembly and non-destructive detachment by varying the adhesion properties with external influencing variables like temperature, electromagnetic radiation, or electric fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a screw connection or welded connection is used to ensure secure connection, then connection strength is improved, but ease of detachment deteriorates (destructive detachment required)
Solution Approach 1:
The connection unit employs a shape memory alloy that can dynamically change its mechanical properties (adhesion strength) in response to temperature changes. At assembly temperature, the alloy has low adhesion allowing easy connection, and at detachment temperature, it exhibits high adhesion for secure connection, enabling non-destructive detachment while maintaining strong connection when needed.
Solution Approach 2:
The invention changes the physical parameter of the connection unit (adhesion strength) by varying temperature. The shape memory alloy transitions between different adhesion states based on temperature, allowing the connection to be easily made at lower temperatures and securely held at higher temperatures, resolving the contradiction between easy detachment and strong connection.
2Shape
If adhesive connection is used to avoid visible screws, then appearance quality is improved, but ease of detachment deteriorates (difficult to detach)
Solution Approach 1:
The shape memory alloy connection unit dynamically adjusts its adhesion properties through temperature control. During assembly, the alloy is in a low-adhesion state allowing clean adhesive-free connection. During detachment, heating the alloy to its transformation temperature activates high adhesion, enabling easy separation without damaging the adhesive surface or components, thus maintaining appearance quality while enabling easy detachment.
3Strength
If high adhesion is maintained during assembly, then connection strength is improved, but positioning precision deteriorates (difficult to position exactly)
Solution Approach 1:
The connection system uses the dynamic adhesion properties of the shape memory alloy to provide low adhesion during the positioning phase, allowing components to be easily positioned and adjusted. Once positioned, heating the connection unit activates high adhesion, securing the precise positioning. This dynamic adjustment resolves the contradiction between strong connection and precise positioning.
4Ease of repair
If non-destructive detachment is enabled, then ease of repair is improved, but connection strength deteriorates (weaker connection)
Solution Approach 1:
The invention uses temperature as a control parameter to switch the shape memory alloy between low-adhesion and high-adhesion states. During normal operation at elevated temperature, the alloy provides strong connection strength. For repair and replacement, cooling the alloy reduces adhesion, enabling non-destructive detachment without compromising the strength of the connection during service.
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
Enables secure and permanent connections without visible screws, simplifies assembly and replacement of components, and allows for flexible connection adjustments based on driving modes or acoustic behavior, improving driving dynamics and noise reduction.
Implementation Method 1
A connection system with a switchable adhesion surface using a shape memory alloy that can adjust its adhesiveness, allowing for easy assembly and non-destructive detachment by varying the adhesion properties with external influencing variables like temperature
Data Source
Figure 1~2
AI summary
The invention relates to a connection (4) between at least two components (2, 3), in particular of a motor vehicle, comprising at least one connection unit (6) which is arranged and/or formed on one of the components (3) and provides at least one connection surface (5) for the connection (4). In order to provide an improved non-destructive connection (4) between components (2, 3), at least one characteristic of the connection unit (6) according to the invention can be deliberately changed in such a way that an adhesion capability of the connection surface (5) is adjustable.