Insulating Element with Siphon Drain for Vehicle Cavity Sealing
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Solution Overview
Problem
Existing systems for sealing and reinforcing cavities in motor vehicle structural elements face challenges such as moisture and dirt ingress, corrosion, noise transmission, and issues with wax-based sealing materials that can liquefy and accumulate, particularly in wheel housings, where traditional solutions are inefficient and costly.
Innovation Solution
A method involving an insulating element with expandable material and a siphon-drain configuration, allowing for pre-installation before dip-coating, where the expandable material expands to close drains and only the siphon remains for wax flow, ensuring reliable sealing and noise reduction, with the wax solidifying to seal the siphon at normal temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing elements are used to seal cavities against moisture and dirt, then protection against corrosion is improved, but the complexity of the sealing system increases and installation becomes more difficult
Solution Approach 1:
The patent combines the sealing function and reinforcing function into a single insulating element. The element has a U-shaped cross-section that seals against the structural element while the protruding portion reinforces the cavity structure, eliminating the need for separate sealing elements and reinforcing elements.
Solution Approach 2:
The insulating element performs multiple functions simultaneously: it seals the cavity against moisture and dirt, reinforces the structural element, provides acoustic insulation, and prevents wax accumulation. This multi-functionality reduces the overall complexity of the sealing system.
2Strength
If reinforcing elements are used to strengthen cavities, then structural strength is improved, but the difficulty of installation in narrow openings increases
Solution Approach 1:
The insulating element is designed with a specific geometry where the protruding portion can be inserted through narrow openings first, and then the main body is positioned to engage with the cavity structure. This segmentation of the insertion sequence facilitates installation through limited access.
Solution Approach 2:
The element is designed to be pre-positioned in the cavity before final assembly steps. The protruding portion is inserted through the opening, and then the main body is engaged, performing the reinforcement function before the component is fully assembled.
3Reliability
If traditional sealing elements are used in wheel housings, then sealing against dirt and water is improved, but wax accumulation problems occur when sealing materials liquefy
Solution Approach 1:
The patent extracts the wax drainage function from the sealing element by providing a dedicated drainage passage through the insulating element. This allows liquid wax to be removed from the cavity while the sealing function is maintained by the expandable material that can seal around the drainage passage.
Solution Approach 2:
The drainage passage acts as an intermediary channel that allows liquid wax to pass through the insulating element to a collection area, preventing accumulation while maintaining the sealing function. The expandable material seals around this passage, allowing liquid flow but preventing vapor or gas passage.
4Weight of moving object
If cavities are left unsealed to maintain lightweight construction, then weight is reduced, but noise transmission and corrosion risk increase
Solution Approach 1:
The insulating element uses an expandable material that can deform and conform to the cavity geometry, creating a flexible seal that blocks noise transmission and moisture ingress while adding minimal weight. The expandable nature allows it to adapt to irregular cavity shapes.
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
This solution simplifies handling and reduces costs by allowing pre-installation of the insulating element, ensuring efficient sealing against liquids and noise, with the wax flowing through the siphon when melted and solidifying to maintain a reliable seal.
Implementation Method 1
Heating, whereby the expandable material expands and thereby closes the at least one outlet
Implementation Method 2
WO 02/062648 A2 proposes providing a closure element in the structural element which has a passage in the form of a siphon. This siphon allows the liquid wax to flow through the closure element
Implementation Method 3
the insulating element being designed and/or arranged in the structural element in such a way that there is at least one drain in addition to the siphon; Coating the inner walls of the structural element with a paint, the paint being able to flow off through the at least one drain; and Heating, whereby the expandable material expands
Data Source
Figure 1~2b
Figure 2c~2e
Figure 3a~3c
AI summary
A system (1) in a motor vehicle comprises a structural element (12, 14) which forms a cavity and an insulating element (16). The insulating element has a support (11) and an expandable material (13) arranged thereon, and the insulating element also has at least one siphon (3). The insulating element is arranged in the cavity of the structural element. The insulating element is designed and/or arranged in the structural element such that, in addition to the siphon, at least one drain (4) exists when the expandable material (13) is in an unexpanded state, and that the at least one drain (4) is closed when the expandable material is in an expanded state.