Vehicle Trim Fastening Mechanism with Bias Element
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Solution Overview
Problem
Vehicle trim assemblies are prone to damage or breakage when excessive force is applied to deployed parts, such as during accidents or when inserting containers, leading to potential damage to the support and the need for part replacement.
Innovation Solution
Incorporating a bias element into the fastening device that biases the first and second fastening elements into the assembly position, allowing them to separate when a force exceeding a predetermined level is applied, preventing rupture and damage by enabling reversible separation of the assembly from the support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a permanent fastening device is used to mount the first part on the support, then the connection strength is improved, but the damage risk when excessive force is applied increases
Solution Approach 1:
The fastening device transitions from a static permanent connection to a dynamic system that can adapt its state. The bias element (spring) allows the fastening elements to move relative to each other, enabling the connection to flex under normal conditions and disconnect when excessive force is applied, thus resolving the contradiction between strong connection and damage resistance
Solution Approach 2:
The fastening device changes its mechanical parameters (position, force) in response to applied loads. Under normal conditions, the bias element maintains strong engagement. When force exceeds the predetermined threshold, the system changes state by allowing the fastening elements to separate, transforming the connection strength parameter dynamically to prevent damage
2Stability of the object's composition
If the first part is permanently fastened to the support, then the structural integrity is improved, but the replacement cost when damage occurs increases
Solution Approach 1:
The fastening system is segmented into separate replaceable components (first fastening element, second fastening element, bias element) rather than being a monolithic permanent connection. This allows the first part to be easily separated and replaced from the support without damaging either component, reducing repair costs while maintaining structural integrity during normal use
Solution Approach 2:
The fastening device is designed as a sacrificial protection mechanism where the bias element and fastening elements can be easily replaced if they fail to protect the first part. The system accepts that the fastening components may need replacement occasionally, but this is much cheaper than replacing the entire first part or support
3Object-affected harmful factors
If a bias element is added to allow separation under excessive force, then the damage prevention is improved, but the device complexity increases
Solution Approach 1:
The bias element (spring) creates a self-regulating fastening system that automatically responds to applied forces. When force exceeds the predetermined threshold, the system self-activates by allowing the fastening elements to separate without requiring external control mechanisms, sensors, or complex control systems, thus preventing damage while minimizing added complexity
Solution Approach 2:
The bias element acts as an intermediary mechanical element between the first and second fastening elements. It mediates the force transmission, allowing normal operational forces to be absorbed while automatically disengaging the connection when excessive force is applied, providing damage prevention through a simple intermediary component rather than complex control systems
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
Prevents damage to the trim assembly by allowing separation instead of breakage under excessive force, eliminating the need for part replacement and supporting safe deployment functions without compromising the assembly's integrity.
Implementation Method 1
the bias element is formed by a spring exerting a bias force on the second fastening element so as to push it against the first fastening element in the assembly position
Data Source
AI summary
A vehicle trim assembly having a support, a first fastening part fastened to the support by a fastening device that includes a first fastening element secured to the first part and a second fastening element secured to the support and a second part movable in a deployment direction relative to the first part. The fastening device has a bias element biasing the first and second fastening elements in the assembly position, the bias element being arranged such that the first and second fastening elements move toward the disassembly position when a force (F) exceeding a predetermined force is exerted in the deployment direction on the second part.