Vehicle Door Trim Dynamic Mounting for Impact Absorption
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Solution Overview
Problem
In vehicle side collisions, existing door trims fail to effectively absorb impact forces due to the rigid fixation of upper and lower boards, leading to inadequate deformation and potential occupant contact.
Innovation Solution
The door trim design includes a mounting boss on the upper board and a mounting flange on the lower board with a through hole and slot combination, allowing the upper board to deform relative to the lower board during a collision, thereby absorbing impact and reducing occupant contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the upper board and lower board are fixed together rigidly, then the structural strength is improved, but the ability to absorb impact in side collisions deteriorates
Solution Approach 1:
The mounting hole transitions from a fixed circular shape to an elongated slot shape, enabling dynamic movement of the upper board relative to the lower board during collision. This allows the structure to adapt its rigidity based on external forces, providing both structural strength and impact absorption capability.
Solution Approach 2:
The mounting hole's geometric parameters are changed from a circular cross-section to an elongated slot with specific dimensions (length 30-50mm, width 5-10mm). This parameter change enables controlled deformation while maintaining structural integrity, resolving the contradiction between strength and impact absorption.
2Stability of the object's composition
If the upper board and lower board are fixed together, then the structural stability is improved, but the deformation capability during collision deteriorates
Solution Approach 1:
The mounting connection transitions from a static fixed joint to a dynamic semi-fixed joint through the slot-shaped mounting hole. This allows the upper board to maintain stable positioning during normal conditions while enabling controlled deformation during collision events.
Solution Approach 2:
The mounting hole is segmented into an elongated slot portion and a circular through-hole portion, creating a hybrid connection that provides both stability and deformation capability. The slot portion allows movement while the through-hole portion maintains structural integrity.
3Object-affected harmful factors
If the upper board deforms during collision, then the impact absorption is improved, but the risk of occupant contact with the door trim increases
Solution Approach 1:
The dynamic mounting connection allows the upper board to deform in a controlled manner during collision, absorbing impact energy while the lower board remains relatively stable to prevent occupant contact. This resolves the contradiction by enabling selective deformation of different components.
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 enhances collision safety by allowing effective absorption of side collision impacts and minimizing the likelihood of occupant contact with the door trim, improving overall safety by enabling controlled deformation of the upper board while maintaining attachment to the lower board.
Implementation Method 1
The mounting boss slides into the slot portion and thus the end portion of the upper board can move relative to the mounting flange of the lower board
Data Source
AI summary
A door trim installed in a vehicle includes an upper board and a lower board. The upper board includes a mounting boss. The lower board includes a body and a mounting flange. The body defines a lower portion of the door trim. The mounting flange extends upward from an upper edge of the body and includes a mounting hole. The mounting flange is disposed behind a back face of the upper board. The mounting boss protrudes from the back face of the upper board toward the mounting hole of the mounting flange. The mounting hole includes a through hole portion and a slot portion. The mounting boss is inserted in the through hole portion. The slot portion extends from a front section of a hole edge of the through hole portion toward a front of the vehicle to communicate with the through hole portion.