Vehicle Door Reinforcement Bar Dynamic Connection
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Solution Overview
Problem
The existing methods for fixing the headband reinforcement bar to the door frame in motor vehicle doors often fail due to the impossibility of performing spot welds at the front end, leading to potential displacement during a frontal impact, which compromises the efficiency of securing the vehicle's survival cell.
Innovation Solution
The implementation of dynamic connection means, including a longitudinal stop stamped into the joint reinforcement, which opposes transverse displacement of the headband reinforcement bar during a frontal impact, and a design that allows energy absorption by the door frame before connecting to the vehicle's uprights, ensuring secure retention of the bar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding is used to fix the headband reinforcement bar to the door frame, then static connection is achieved, but the front end cannot be welded due to mirror reinforcement overlap, causing potential displacement during impact
Solution Approach 1:
A longitudinal stop is introduced as an intermediary element between the headband reinforcement bar and the door frame. This stop is integrated into the joint reinforcement structure and provides a bearing surface for the front end of the bar, enabling force transmission without requiring welding at the inaccessible front end position.
Solution Approach 2:
The connection function is segmented into two parts: the main body of the headband reinforcement bar is welded to the door frame at accessible positions, while the front end is supported by the longitudinal stop integrated in the joint reinforcement, separating the welding operation from the force transmission function at the front end.
2Stability of the object's composition
If the headband reinforcement bar is rigidly fixed at the front end, then displacement resistance is improved, but the door frame cannot absorb impact energy before connection, increasing localized deformation risk
Solution Approach 1:
The connection system transitions from a purely rigid fixed connection to a dynamic connection that allows controlled movement. The longitudinal stop provides initial support while permitting the door frame to deform and absorb energy during impact, with the bar becoming firmly connected as the frame deforms, thus balancing position stability with energy absorption capability.
Solution Approach 2:
The door frame is designed to absorb impact energy before the headband reinforcement bar becomes fully engaged with the uprights. The longitudinal stop is positioned to allow initial frame deformation, cushioning the impact force before it reaches the bar, thereby preventing localized deformation while maintaining eventual position stability.
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 solution enhances the resistance to deformation and maintains the headband reinforcement bar's connection during impacts, improving the structural integrity and reducing the risk of localized deformation, thus ensuring better protection for vehicle occupants.
Implementation Method 1
a longitudinal stop s extending opposite the front end portion of the bar in order to oppose its transverse displacement during a frontal impact
Implementation Method 2
in the event of a frontal impact, the door frame absorbs a quantity of energy before the headband reinforcement bar puts in mechanical connection two vertical uprights
Data Source
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AI summary
The invention relates to a motor vehicle door (1) with a reinforcing strip bar (2), comprising a door frame (3), and static connecting means (4, 5) for connecting the bar to the frame in an initial configuration. More particularly, the door includes dynamic connecting means (6) for connecting the bar to the frame in a deformed configuration of the door frame, said dynamic connecting means comprising at least one longitudinal stop (7) extending from the front end portion (20) of the bar to resist its transverse displacement during a frontal impact. The invention also relates to a vehicle having such a door.