Vehicle Pillar Trim Module Airbag Deployment
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Solution Overview
Problem
In motor vehicles, particularly in the region of the A-pillar, existing trim modules fail to ensure a safe and unhindered deployment of curtain airbags by allowing trim parts to obstruct or be damaged during airbag inflation, and often require additional retaining means like catch straps to prevent uncontrolled entry into the vehicle interior.
Innovation Solution
A trim module comprising a trim body with a pivot portion, a bearing portion, and a support portion, connected via a latch and jointed connection, which allows the airbag to unlatch the latch and pivot the trim body, creating a passage for the airbag while directing forces through the support portion to prevent damage and uncontrolled flinging of trim parts, thus ensuring quick and safe airbag deployment without direct impact on the jointed connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the trim part is firmly retained on the pillar using retaining clamps, retaining clips, or catch straps, then the trim part is prevented from uncontrolled entry into the vehicle interior, but the trim part obstructs the airbag deployment and may be damaged during inflation
Solution Approach 1:
The trim part is designed with a dynamic retention system where the latch can transition from a locked state (preventing uncontrolled entry) to an unlocked state (allowing airbag deployment). The retention force is not static but can be released when triggered by the airbag inflation force, resolving the contradiction between firm retention and unobstructed deployment.
Solution Approach 2:
The retention mechanism changes its holding parameter (latch engagement) based on the deployment condition. During normal operation, the latch maintains strong engagement to prevent trim entry. During airbag deployment, the force from inflation changes the parameter state, causing the latch to release and allowing the trim to pivot open.
2Object-affected harmful factors
If the trim part is designed to pivot open during airbag deployment, then the airbag can deploy unhindered, but the trim part may be flung into the vehicle interior in an uncontrolled manner
Solution Approach 1:
The jointed connection acts as an intermediary element between the pivot portion and the basic body. It controls the pivot movement, allowing the trim to open for airbag deployment while guiding the motion in a controlled manner. This intermediary mechanism prevents uncontrolled flinging by constraining the pivot trajectory.
Solution Approach 2:
The catch strap, which would otherwise be needed to prevent uncontrolled trim entry, is extracted from the design. The jointed connection with controlled pivot movement inherently prevents uncontrolled flinging without requiring additional retaining means, simplifying the overall system.
3Reliability
If additional retaining means like catch straps are used to prevent uncontrolled trim entry, then the trim part is securely retained, but the device complexity increases
Solution Approach 1:
The retention function and the pivot hinge function are merged into a single integrated structure. The jointed connection serves both as the retention mechanism (replacing the latch) and as the pivot hinge, eliminating the need for separate catch straps or retaining clips. This consolidation reduces device complexity while maintaining secure retention.
Solution Approach 2:
The jointed connection performs multiple functions: it acts as the retention mechanism holding the trim closed, serves as the pivot hinge enabling controlled opening, and provides the structural connection between trim parts. This multi-functionality eliminates the need for separate specialized components for each function.
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
The trim module enables brisk and safe opening of the trim part covering the airbag, preventing obstruction and damage, ensuring unhindered airbag deployment and protecting the jointed connection from direct force impact, potentially eliminating the need for additional retaining means like catch straps.
Implementation Method 1
an inflatable airbag (11) arranged in a first receiving region formed by the pivot portion (6), the bearing portion (8) and the support portion (9)
Data Source
AI summary
A trim module is disclosed for a pillar of a motor vehicle, in particular for an A-pillar of a motor car. The trim module includes a trim body, a basic body configured to connect to the pillar, a latch and a jointed connection. The trim body includes a pivot portion pivotable about the jointed connection and facing the interior of the motor vehicle. The basic body includes a connecting portion, a bearing portion and a support portion. The support portion is formed in the direction of the pivot portion. The pivot portion, the bearing portion and the support portion form a first receiving region for an inflatable airbag. The pivot portion and the bearing portion are detachably connected to one another by the latch and the jointed connection is formed on the side of the support portion facing away from the first receiving region.