Compression Limiter with Drain for Mixed-Material Joints
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Solution Overview
Problem
Typical corrosion protection methods for mixed-material joints, such as electrodeposited paint, are inadequate in preventing galvanic corrosion between dissimilar materials, and additional coatings or sealers may increase weight, cycle time, and cost, making them impractical for complex or recessed areas.
Innovation Solution
A compression limiter with a drain is used between two joined body panels of different materials, configured to reduce joining stress and oriented to drain moisture from the interface, preventing galvanic corrosion by eliminating electrolytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional coatings or sealers are implemented to mitigate galvanic corrosion effects, then corrosion protection is improved, but weight, cycle time and cost increase
Solution Approach 1:
The invention extracts and removes moisture from the joint interface between dissimilar materials using a drain feature, eliminating the electrolyte that causes galvanic corrosion without adding protective coatings or sealers. This approach addresses corrosion protection by removing the harmful element (moisture) rather than adding a protective layer.
Solution Approach 2:
The compression limiter incorporates a porous or absorbent material that can wick and absorb moisture from the joint interface. This porous structure allows the material to actively draw moisture away from the dissimilar material joint, preventing galvanic corrosion without requiring additional coatings.
2Reliability
If additional coatings or sealers are implemented to mitigate galvanic corrosion effects, then corrosion protection is improved, but cycle time and cost increase
Solution Approach 1:
The invention merges the corrosion protection function into the compression limiter itself by incorporating a drain feature or porous material. This integration eliminates the need for separate coating or sealing steps, reducing cycle time while maintaining corrosion protection effectiveness.
Solution Approach 2:
By extracting moisture from the joint interface through the compression limiter's drain feature, the invention provides corrosion protection without requiring additional coating processes, thereby reducing manufacturing cycle time and cost.
3Reliability
If additional coatings or sealers are implemented to mitigate galvanic corrosion effects, then corrosion protection is improved, but device complexity increases
Solution Approach 1:
The compression limiter serves multiple functions: it provides mechanical compression to reduce joining stress and simultaneously provides corrosion protection through its integrated drain feature or porous material. This multi-functionality eliminates the need for separate corrosion protection components, reducing overall device complexity.
Solution Approach 2:
The invention combines the corrosion protection function with the compression limiter by integrating a drain feature or porous material into the same component. This merging reduces the number of separate parts and simplifies the overall assembly process.
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 compression limiter effectively reduces stress on the joint and prevents galvanic corrosion by removing moisture, allowing for multi-material constructions that enhance structural rigidity and reduce vehicle weight while avoiding the drawbacks of traditional corrosion protection methods.
Implementation Method 1
The drain is configured to provide a fluid passageway through the sleeve, and oriented such that moisture is wicked from between the first and second panels
Data Source
AI summary
A vehicle includes a body panel assembly including first and second panels. Each panel defines different materials, and the first and second panels are fastened at a joint using a fastener. A compression limiter is disposed at the joint and configured to reduce stress on the first and second panels due to the fastener. The compression limiter has a first ring to contact the first panel and a second ring to contact the second panel. The first ring defines a drain extending through the first ring to the second ring on an outer periphery of the first ring, and is oriented such that moisture between the first and second panels is wicked through the drain and removed from the panel assembly.