Side Door Retention Reinforcer for Impact Safety
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Solution Overview
Problem
In motor vehicles, side impacts can cause unintended door opening due to the deformation of the vehicle structure, compromising occupant safety as the exterior opening control moves closer to the lock, potentially disengaging the bolt and opening the door unexpectedly.
Innovation Solution
A retention reinforcement structure is integrated into the side door, featuring a geometric design with a concave portion and hollow shape to absorb impact forces, limiting the movement of the exterior opening control and lock rod, and is easily adaptable to conventional side doors without redesigning the external opening control or belt reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the exterior opening control is allowed to move freely during side impact, then the door can open in normal operation, but the door may open unexpectedly during side impact compromising occupant safety
Solution Approach 1:
The door structure is segmented into multiple functional zones: the exterior opening control assembly, the lock mechanism, and the retention reinforcement structure. The retention reinforcement acts as a separate structural element that specifically manages impact forces without interfering with normal opening operations.
Solution Approach 2:
The retention reinforcement structure is pre-installed in the door panel to provide protective cushioning during side impacts. The concave portion and hollow shape are designed in advance to absorb and distribute impact forces before they can reach the exterior opening control and lock mechanism, preventing unexpected door opening while preserving normal operation.
2Reliability
If a retention reinforcement structure is added to prevent door opening during impact, then occupant safety is improved, but the door structure complexity increases
Solution Approach 1:
The retention reinforcement structure is merged with the existing door panel and belt reinforcement. The reinforcement integrates into the door's structural framework, sharing load paths and structural functions with existing components, thereby adding safety functionality without proportionally increasing overall structural complexity.
Solution Approach 2:
The retention reinforcement structure serves multiple functions: it reinforces the door panel against side impacts, protects the exterior opening control mechanism, and maintains door retention. This multi-functionality reduces the need for separate dedicated components for each protective function.
3Strength
If the retention reinforcement is designed with complex geometry to absorb impact forces, then impact resistance is improved, but manufacturing difficulty increases
Solution Approach 1:
The retention reinforcement utilizes a thin-walled hollow structure with concave portions that can be formed through stamping or extrusion processes. This thin-walled geometry provides high strength-to-weight ratio and excellent impact absorption through controlled deformation, while remaining compatible with standard metal forming manufacturing processes.
Solution Approach 2:
The retention reinforcement incorporates curved surfaces and hollow shapes that are optimized for absorbing impact forces. These curved geometries distribute stress more effectively than flat surfaces and can be efficiently manufactured using conventional forming processes, balancing impact resistance with manufacturing ease.
Data Source
Figure 1~2
Figure 3a~3b
Figure 4~5
AI summary
This is an automotive vehicle structure (10) comprising a first lock element, a side access opening (11) and a side door (20) which uncovers and closes said side access opening (11). The side door (20) has an inside facing toward the vehicle interior, and an opposite outside. It comprises: a hollow door panel (24), a waist rail (31) housed in the door panel (24) and extending along it, a second lock element (53) engaging reversibly in the first lock element, a control (51) for opening the door (20) from the outside, accessible on said outside of the door panel (24), a linkage (54) for actuating the second lock element (53), the linkage being fitted between this second lock element and the control (51) for opening from the outside. The structure (10) further comprises a connecting member forming a retaining reinforcer (60), housed in the door panel (24), defining a stiff mechanical connection between the waist rail (31) and the control (51) for opening from the outside.