B-Pillar Sealing Strip with Co-Molded Elastomer Halves
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Solution Overview
Problem
The existing sealing and trim strips for the B-pillar of passenger cars with frameless doors require increased installation effort and can become loose over time, leading to unsightly gaps between the decorative panel and the seal, increasing manufacturing costs and reducing visual appeal.
Innovation Solution
A combined decorative and support panel with integrated sealing halves, produced through two-component injection molding, where the sealing profiles are divided into two halves connected to the panels, simplifying assembly and eliminating the need for subsequent clipping, and using thermoplastic elastomers for optimized sliding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the seal is clipped into the groove formed between the carrier cover and decorative cover, then the seal can be installed, but the assembly effort is increased
Solution Approach 1:
The seal is integrated directly into the decorative cover through co-molding, merging two previously separate components (seal and decorative cover) into a single unified part. This eliminates the clipping operation and reduces assembly steps while maintaining the sealing function.
Solution Approach 2:
The seal is pre-formed as an integral part of the decorative cover during the molding process itself, rather than being attached separately afterward. This preliminary integration of the seal into the cover structure eliminates subsequent assembly operations.
2Productivity
If the seal is inserted or clipped into the groove, then the seal can be attached, but the assembly effort and time are increased
Solution Approach 1:
The seal and decorative cover are manufactured as a single integrated component through co-molding technology, eliminating the need for separate clipping or insertion operations. This significantly reduces both assembly time and increases production productivity.
3Ease of manufacture
If the seal is clipped into the groove, then the seal can be installed, but the complexity of the assembly process is increased
Solution Approach 1:
The sealing profile is integrated into the decorative cover as a single co-molded component, merging the seal attachment process into the manufacturing process itself. This eliminates complex clipping operations and simplifies both manufacturing and assembly processes.
4Reliability
If the seal becomes loose over time, then the seal may no longer be securely in place, but unsightly gaps appear between the B-pillar trim and the seal
Solution Approach 1:
The seal is co-molded as an integral part of the decorative cover, creating a permanent unified structure that cannot become loose or detach. This eliminates the reliability issue of seals becoming insecure while maintaining perfect visual appearance without gaps.
Solution Approach 2:
The seal is permanently formed as part of the decorative cover structure during manufacturing, ensuring it remains securely in place throughout the vehicle's lifetime. This preliminary integration prevents future loosening and maintains aesthetic appearance.
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 reduces assembly work, enhances visual quality, and lowers costs by integrating sealing profiles directly into the panels, ensuring a tight and aesthetically consistent seal without the need for complex installation processes.
Implementation Method 1
The individual sealing halves of the gasket can be joined to the decorative cover and the carrier cover in a particularly simple way using two-component injection molding
Implementation Method 2
using thermoplastic elastomers for optimized sliding properties
Implementation Method 3
both parts—the decorative bezel and the carrier bezel—can be bonded together by a material-bonded connection, for example, by ultrasonic welding
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a sealing and cover strip (8) for the B pillar (7) of a passenger vehicle, with a support cover (10) and a decorative cover (9), which covers, on at least one of their common longitudinal sides, have a sealing profile (11, 12) for a lowerable side window (4, 5). The problem addressed by the present invention is that of improving a sealing and cover strip (8) of the type mentioned at the beginning in such a manner that the outlay on assembly during production of the vehicle is reduced and also the visual appearance is improved, and therefore the sealing profile consists of two sealing halves (13, 13', 14, 14'), wherein one half (13, 13') in each case is connected to the decorative cover (9) and the other half (14, 14') in each case is connected to the support cover (10).