Compensating Bulkhead Carrier for Stable Cavity Sealing
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Solution Overview
Problem
The use of bulkhead parts with expansion materials in the automotive industry leads to visual flaws such as dents or bulges on vehicle outer skins due to the expansion and contraction of these materials, which are difficult to control and result in inconsistent sealing and supporting performance.
Innovation Solution
A bulkhead part design featuring a carrier with a compensating element that allows flexible change in the effective sealing surface and a limiting element with a shock-absorbing abutment edge to manage forces caused by expansion and contraction, preventing deformation of adjacent components by maintaining a constant sealed area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If expansion material is used to seal and support cavities, then sealing performance is improved, but visual defects such as dents or bulges occur on outer skins
Solution Approach 1:
The carrier is designed with a movable section that can dynamically adjust its position in response to forces from expansion material. This dynamic adaptation allows the carrier to maintain constant contact pressure for effective sealing while accommodating the expansion and contraction of the expansion material without transmitting excessive forces to the outer skin, thereby preventing dents or bulges.
Solution Approach 2:
The invention changes the parameter of the carrier's effective sealing surface area, allowing it to vary as the movable section shifts position. This parameter change enables the sealing surface to adapt to the expansion material's volume changes while maintaining constant contact pressure, resolving the contradiction between sealing effectiveness and prevention of visual defects.
2Manufacturing precision
If the effective sealing surface of the carrier is made variable, then control over expansion forces is improved, but device complexity increases
Solution Approach 1:
The carrier is segmented into a fixed section and a movable section that can independently move relative to each other. This segmentation allows the movable section to adjust the effective sealing surface area in response to expansion forces while the fixed section maintains structural stability. The simple hinge connection between sections adds minimal complexity while achieving precise control over expansion forces.
3Weight of moving object
If thinner sheet metal is used to reduce vehicle weight, then weight is reduced, but susceptibility to bulging or denting from expansion material increases
Solution Approach 1:
The carrier acts as an intermediary element between the expansion material and the thin outer skin. It absorbs and distributes the expansion forces through its movable section mechanism, preventing direct transmission of concentrated forces to the thin sheet metal. This protective intermediary function allows the use of thinner, lighter sheet metal without compromising resistance to bulging or denting.
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
Ensures effective sealing against noise, moisture, and structural integrity while preventing bulging or indentation of components, allowing for more flexible material selection and improved manufacturing ease.
Implementation Method 1
The expansion material is characterized by the fact that, when the bulkhead is installed, it can be converted from an initial state to an expanded state by activation
Implementation Method 2
After expansion, the expansion material cools down again and contracts, at least partially
Data Source
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AI summary
The invention relates to a bulkhead part (1) for sealing and/or supporting a cavity, comprising a support (2) and an expansion material (3) arranged on the support (2), which can be transformed from an initial state into an expanded state by activation, wherein the support (2) comprises at least one compensating element (4) by which a variability of the effective sealing surface (5) of the support (2) is given, such that a change in the effective sealing surface (5) of the support (2) can be effected by a force acting on the support (2), wherein a limiting element (6) is provided by which a movement of at least one section of the support (2) associated with the change in the effective sealing surface (5) is limited.