CFK Fastening Device with Adhesive Bushing
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Solution Overview
Problem
Connecting structural parts made of carbon fiber-reinforced plastic to vehicle components, such as chassis components, is challenging due to settlement behavior under pressure, which compromises the safety and strength of the connection.
Innovation Solution
A fastening device is designed with a first connecting element affixed to the structural part using an adhesive layer, featuring a protruding bush that prevents clamping forces and allows for high-strength, detachable screw connections, and optionally includes additional adhesive bonding to the component for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon fiber-reinforced plastic structural parts are connected using conventional clamping methods, then mechanical strength can be achieved, but settlement behavior occurs under pressure that compromises connection safety
Solution Approach 1:
The connection system is divided into separate functional elements: a first connecting element with adhesive bonding for the CFK part, and a second connecting element (bushing) that provides the mechanical connection point. This segmentation allows the CFK part to be bonded without direct clamping, preventing settlement while maintaining strength.
Solution Approach 2:
The first connecting element acts as an intermediary between the CFK structural part and the second connecting element. It transfers loads from the CFK part through adhesive bonding to the bushing, which then handles the mechanical connection to the component, eliminating direct clamping of the CFK part.
2Reliability
If adhesive bonding is used to connect the first connecting element to the structural part, then settlement behavior is prevented, but connection strength may be insufficient for high-load applications
Solution Approach 1:
The solution combines multiple connection methods: adhesive bonding between the first connecting element and CFK part, and mechanical threading between the first and second connecting elements. This hybrid approach merges the settlement-prevention benefit of adhesive with the high-strength capability of mechanical fastening.
3Strength
If direct screw connections are made to carbon fiber-reinforced plastic, then high-strength connections can be achieved, but the settlement behavior under pressure compromises the connection
Solution Approach 1:
The harmful clamping action is extracted and removed from the connection system. Instead of directly clamping the CFK part with screws, the invention uses adhesive bonding to attach a connecting element that provides the screw connection interface, thereby eliminating the settlement-causing clamping while preserving mechanical strength.
4Ease of manufacture
If conventional fastening methods are used, then manufacturing simplicity is maintained, but production costs increase for high-piece-number manufacturing
Solution Approach 1:
The first connecting element is pre-affixed to the CFK structural part using adhesive bonding before final assembly. This preliminary action simplifies the main assembly process and enables efficient high-volume production, as the adhesive-bonded connecting element serves as a ready-made connection interface.
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 solution provides a safe, high-strength, and cost-effective connection that transmits tensile, lateral, and pressure forces while preventing settlement behavior, facilitating easy setup and detachment.
Implementation Method 1
The first connecting element is connected to the structural part by an adhesive layer
Data Source
AI summary
A fastening device is provided for fastening a structural part consisting of a carbon-fiber reinforced plastic, in particular a cell of a vehicle, to a component, in particular a chassis component of a vehicle. In order to provide a fastening device which ensures a secure fastening of structural parts consisting of a carbon fiber-reinforced plastic to other vehicle components, a first connecting element is mounted on the structural part, on which first connecting element a second connecting element can be mounted. The first connecting element is connected to the structural part by an adhesive layer and has a protruding bush which passes through a bore in the structural part and which projects with its free end beyond the structural part.