Vacuum Cover Leak Checking for Double-Wall Vehicle Panels
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Solution Overview
Problem
Current methods for checking the tightness of motor vehicle body panels, particularly tailgates, are bulky, difficult to use, and can damage the panels due to high clamping forces required for air pressure testing, making them unsuitable for systematic or 100% production control.
Innovation Solution
A device using vacuum covers and ultrasound technology to isolate and test the integrity of glue joints between bodywork skins and boxes, minimizing damage and simplifying the testing process by applying localized vacuum and sound waves to detect leaks without the need for heavy clamping equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If air pressure testing is used to check seal integrity, then leak detection capability is improved, but the device becomes bulky and requires heavy clamping equipment
Solution Approach 1:
The patent replaces the traditional mechanical air pressure testing system with an acoustic emission detection system. Instead of using bulky pressure chambers and heavy clamping equipment, the invention uses ultrasound transducers to detect leaks through acoustic signals, dramatically reducing device complexity and size while maintaining leak detection capability
Solution Approach 2:
The patent uses a controlled air flow system with adjustable pressure to create test conditions without requiring full pressure containment. The air source provides controlled pressure differentials that can be detected acoustically, avoiding the need for bulky sealed test chambers
2Reliability
If high clamping forces are applied to seal orifices during air pressure testing, then sealing reliability is improved, but panel damage occurs
Solution Approach 1:
The patent applies only the minimum necessary clamping force through vacuum cups to achieve adequate sealing of orifices during testing. Instead of using excessive clamping forces that cause panel damage, the system uses controlled vacuum pressure that is sufficient for sealing but gentle enough to avoid damaging the panel surface
Solution Approach 2:
The patent changes the pressure parameter from positive high pressure requiring strong mechanical sealing to negative vacuum pressure that achieves sealing with minimal force. The vacuum cups create adequate seals at low pressure differentials, eliminating the need for high clamping forces that would damage the panel
3Measurement precision
If traditional air pressure testing with compression clamping bells is used, then seal integrity can be checked, but the process is time-consuming and difficult to operate
Solution Approach 1:
The patent replaces complex mechanical positioning and clamping operations with automated acoustic detection. The ultrasound transducers and signal processing system automatically identify leaks without requiring operators to manually position heavy clamping bells or interpret pressure gauge readings, significantly improving ease of operation
Solution Approach 2:
The acoustic emission detection system provides automatic leak identification and localization. The system self-regulates the testing process, automatically detecting and pinpointing leak locations through acoustic signals without requiring continuous operator intervention or complex manual procedures
4Measurement precision
If air overpressure is applied during sealing control, then leak detection sensitivity is improved, but the forces required damage the panel and control means
Solution Approach 1:
The patent inverts the traditional approach by using vacuum (negative pressure) instead of positive pressure for both the vacuum cup sealing and the leak detection process. This inversion allows sensitive leak detection at low pressure differentials, avoiding the high forces and potential damage associated with traditional positive pressure testing
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 provides a quicker, less damaging, and more reliable method for checking the tightness of motor vehicle body panels, allowing for easier operator use and reduced risk of panel damage, while ensuring accurate detection of seal integrity without confusing orifice leaks with joint defects.
Implementation Method 1
A device is disclosed which uses vacuum covers and ultrasound technology to isolate and test the integrity of glue joints
Implementation Method 2
A device using vacuum covers and ultrasound technology to isolate and test the integrity of glue joints
Data Source
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AI summary
The invention relates to a device (34) for checking the integrity of a sealing gasket disposed between a portion of a body box (20) and a body skin (20) having at least one through-hole in the box (32) or through-hole in the skin (30). The device comprises at least one vacuum-sealed cover (46) for covering the hole (30, 32), which is delimited by two inner and outer surfaces. The inner surface of the cover (46I) is provided with two sealing gaskets, one inner (48I) and one outer (48E). The contour of the inner cover gasket (48I) is contained within that of the outer cover gasket (48E). The cover (46) is traversed by at least one suction conduit (50) of the cover opening, on the one hand, between the two cover seals (48I,48E) on the side of the inner surface (46I) of the cover and, on the other hand, on the side of the outer surface (46E) of the cover.