Inflatable C-Pillar Sealing Insert for Vehicle Body Gaps
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Solution Overview
Problem
Existing sealing methods for the lower C-pillar of motor vehicle doors, which involve a paint bead, fail to balance the need for minimal gaps for stress relief with the requirement for effective sealing against noise, dust, and water ingress, particularly in electric vehicles.
Innovation Solution
A motor vehicle design incorporating an inflatable insert that extends into gaps between the passenger compartment wall and wing lining to provide dual sealing at the lower C-pillar and clip tab, eliminating the need for a paint bead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a paint bead is used for sealing the lower C-pillar, then sealing effectiveness is improved, but the gap between metal sheets must be reduced which conflicts with stress relief requirements
Solution Approach 1:
An inflatable sealing insert is introduced as an intermediary element between the quarter panel liner and the passenger compartment wall. This insert can be inflated to fill gaps and provide effective sealing without requiring the metal sheets to be in direct contact or have minimal gaps, thus resolving the conflict between sealing effectiveness and stress relief gap requirements
Solution Approach 2:
The sealing solution changes from a static paint bead to a dynamically adjustable inflatable insert. By changing the inflation parameter (volume/pressure) of the insert, the system can adapt to varying gap sizes while maintaining effective sealing, eliminating the need to reduce the gap between metal sheets for sealing purposes
2Reliability
If an expanding insert and paint bead are used for sealing, then sealing coverage is improved, but manufacturing complexity increases
Solution Approach 1:
The invention merges the sealing functions into a single inflatable insert that simultaneously seals both the lower C-pillar area and the stapling tab area. This consolidation eliminates the need for separate expanding inserts and paint bead application processes, thereby reducing manufacturing complexity while maintaining comprehensive sealing coverage
Solution Approach 2:
The inflatable insert serves multiple sealing functions in different locations (lower C-pillar and stapling tab) with a single component. This multi-functional approach simplifies the manufacturing process by reducing the number of separate sealing operations and components required
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
Simplifies vehicle manufacturing by ensuring effective sealing without the need for a paint bead, balancing gap requirements for stress relief and sealing, thus streamlining production.
Implementation Method 1
an inflating insert extending into gaps between the passenger compartment wall and the wing lining on an external side of the upper space with reference to the lateral axis, towards the inner side member on an internal side of the lower space with reference to the lateral axis, so as to seal the upper and lower spaces below the stapling tab with reference to the vertical axis
Data Source
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AI summary
The invention relates to a motor vehicle comprising a body including a quarter panel liner (DC) resting on an inner side member (LI), comprising a clip (PA) retaining said liner (DC), the assembly being covered by an outer passenger compartment wall, delimiting an upper and a lower space with respect to the vertical axis (Z), delimited by a rear fender liner (DAR), characterized in that the body further comprises an inflatable insert extending into gaps between the passenger compartment wall and the fender liner (DAR) on an outer side of the upper space, towards the inner side member (LI) on an inner side of the lower space, so as to seal the upper and lower spaces below the clip (PA) with respect to the vertical axis (Z). The invention also relates to a method of manufacturing such a vehicle.