Energy Store Fastening with Controlled Release in Vehicle Floor Crashes
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Solution Overview
Problem
Existing fastening arrangements of energy stores on motor vehicle body floors face challenges in achieving a satisfactory accident behavior without incurring high costs and excessive weight, particularly when a central tunnel-shaped member is present, which prevents a continuous transverse load path for accident forces.
Innovation Solution
A fastening arrangement that allows selective release of the energy store's connection to the floor during an accident, using retention and connection elements with predetermined failure points, enabling the energy store to move relative to the tunnel-shaped member and absorb deformation energy, thus ensuring safety and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the energy store is rigidly fixed to the floor, then structural integrity is maintained, but accident energy cannot be effectively absorbed and the risk of damage increases
Solution Approach 1:
The fastening arrangement transitions from a static rigid connection to a dynamic system with controlled movement. The energy store can move relative to the floor during accidents through the failure of retention elements, allowing the system to adapt to impact forces dynamically rather than resisting them rigidly throughout.
Solution Approach 2:
The retention elements are designed with predetermined failure points that will fail at controlled locations during accidents. This beforehand design of failure modes allows the system to cushion impact energy through controlled deformation and movement, preventing uncontrolled damage to critical components.
2Ease of manufacture
If continuous fastening elements are used, then manufacturing simplicity is maintained, but selective release during accidents cannot be achieved
Solution Approach 1:
The continuous fastening element is divided into multiple discrete segments: retention elements with predetermined failure points and connection elements. This segmentation allows different portions of the fastening system to perform different functions - some parts fail selectively during accidents while others maintain the connection, enabling both manufacturing simplicity and accident adaptability.
Solution Approach 2:
Different portions of the fastening system have different properties - retention elements are designed to fail at specific locations during accidents, while connection elements maintain the structural connection. This local differentiation of properties allows the system to provide both ease of manufacture and selective release capability.
3Object-affected harmful factors
If the energy store is allowed to move freely during accidents, then accident energy absorption is improved, but structural stability during normal operation deteriorates
Solution Approach 1:
The system provides rigid stability during normal operation through the intact retention and connection elements, then transitions to controlled movement during accidents when retention elements fail. This dynamic behavior allows the system to maintain structural stability when needed and absorb energy when required.
Solution Approach 2:
The retention elements are pre-configured with predetermined failure points that will activate under specific accident conditions. This preliminary design ensures that the energy store remains stable during normal operation but will move controllably during accidents to absorb energy, preventing uncontrolled damage.
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 effectively converts accident energy into deformation energy, maintaining safety and structural integrity while avoiding excessive weight and cost, by allowing the energy store to detach selectively and deform the tunnel-shaped member, thereby reducing the risk of damage.
Implementation Method 1
the retention element has at least one desired failure location, at which the retention element selectively fails as a result of the accident-related force application
Implementation Method 2
the connection element has at least one desired failure location, at which the connection element selectively fails as a result of the accident-related force application
Implementation Method 3
the at least one storage device can be displaced inwardly relative to the floor in a transverse vehicle direction... whereby, for example, the central tunnel-shaped member or the exhaust gas system becomes deformed... accident energy can be converted into deformation energy
Data Source
AI summary
A fastening arrangement of an energy store on a floor of a body for a motor vehicle is provided. The energy store is fastened to the floor of the body, wherein the floor has a central tunnel in which at least a partial region of an exhaust gas system for the motor vehicle runs. A respective storage device of the energy store is arranged on each side of the central tunnel and of the exhaust gas system in the transverse direction of the vehicle. The respective storage device of the energy store is fastened to the floor by means of at least one respective fixing device in such a manner that, as a result of an accident-induced application of force running in the transverse direction of the vehicle, the fastening of at least one of the storage devices is releasable in a targeted manner and the at least one storage device is thereby shiftable inwards in the transverse direction of the vehicle relative to the floor.