Expandable-Hinge Bulkhead Part for Watertight Cavity Sealing
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Solution Overview
Problem
Existing bulkhead parts for sealing cavities in the automotive sector face limitations in load-carrying capacity and watertightness due to brittle film hinges, which restrict mobility and have limited durability and sealing effectiveness.
Innovation Solution
A bulkhead part with a hinge comprising multiple components, where at least one hinge component contains an expansion material that transforms into a sealant upon activation, providing high load-carrying capacity and watertightness, produced using a two-component injection molding process with a carrier material and expansion material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a film hinge is used to connect structural components, then the bulkhead part can be made with a simple structure, but the load-carrying capacity is limited and the hinge may break or crack due to brittleness and material fatigue
Solution Approach 1:
The hinge is produced as a two-component system combining a carrier material (providing structural framework and mechanical strength) with an expansion material (providing flexibility and sealing capability). This composite structure resolves the contradiction by integrating both strength and flexibility in a single hinge component, preventing brittle failure while maintaining simplicity.
Solution Approach 2:
The expansion material undergoes a parameter change from a compact initial state to an expanded state, transforming the hinge's physical properties. This allows the hinge to adapt its characteristics - being flexible during movement and providing sealing when expanded - thereby improving reliability without increasing structural complexity.
2Ease of manufacture
If a film hinge is used to connect structural components, then the manufacturing process is simple, but the freedom of movement is restricted compared to multi-component hinges
Solution Approach 1:
The two-component hinge combines carrier material for structural support with expansion material for flexibility. This composite construction enables greater freedom of movement than traditional film hinges while maintaining the advantage of integrated manufacturing, as the hinge is produced in a single two-component injection molding process.
Solution Approach 2:
The hinge incorporates dynamic characteristics through the expansion material, which can change its physical state. The hinge transitions between different operational states - compact for storage and expanded for sealing - enabling adaptive movement capabilities that improve ease of operation while keeping manufacturing simple.
3Ease of operation
If traditional hinges are used to connect structural components, then the freedom of movement is high, but watertightness in the hinge region is not provided
Solution Approach 1:
The expansion material component provides sealing capability by expanding to fill gaps and crevices in the hinge region. This composite structure maintains the freedom of movement provided by the multi-component design while adding the critical watertightness function that traditional hinges lack.
Solution Approach 2:
The expansion material undergoes a state change from compact to expanded form, transforming the hinge from a non-sealing structure to a watertight connection. This parameter change enables the hinge to provide both freedom of movement and sealing protection against moisture and noise, resolving the contradiction between operational freedom and environmental protection.
4Object-affected harmful factors
If expansion material is added to the hinge component, then sealing capability is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The hinge is designed as a two-component composite from the outset, with the carrier material providing structure and the expansion material providing sealing. This integrated composite design avoids the complexity of assembling separate sealing components, as both materials are molded together in a single two-component injection molding process.
Solution Approach 2:
The manufacturing process merges the formation of both hinge components into a single two-component injection molding operation. This combining of materials and processes achieves superior sealing capability without increasing manufacturing complexity, as the expansion material is integrated into the hinge structure during the molding process itself.
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 solution enables a robust, movable bulkhead part with enhanced sealing capabilities against noise and moisture, maintaining structural integrity and flexibility during installation and operation.
Implementation Method 1
it being possible to convert the expansion material 8 from an initial state into an expanded state by activation
Implementation Method 2
molding the structural components and portions of the hinge components not consisting of expansion material from the carrier material in an injection mold using an injection molding process
Implementation Method 3
overmolding the structural components with the expansion material in the injection molding process
Data Source
AI summary
A cavity sealing bulkhead part is provided comprising a first structural component, a second structural component and a hinge for producing a movable connection between the first structural component and the second structural component; the hinge comprising a first hinge component assigned to the first structural component and a second hinge component assigned to the second structural component, the first hinge component and the second hinge component being movable relative to one another about a shaft, at least one of the two hinge components comprising an expansion material that is convertible from an initial state into an expanded state by activation, and in the expanded state acting as a sealant between the first and second hinge components; and the bulkhead part being produced in a two-component injection molding process using a carrier material and the expansion material; also provided are methods for producing the bulkhead part.