Bonded Vehicle Window Frame for Edge Sealing Without Outer Overlap
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Solution Overview
Problem
Conventional window assemblies for vehicles, particularly large side windows, are expensive to encapsulate due to the need for large tools and molds, and there is a desire for a frame that can be bonded to the inner surface of the window panel without encroaching on the outer surface.
Innovation Solution
A vehicular window assembly with a perimeter frame comprising an inner plastic frame portion and an overmolded polymeric outer frame portion, adhesively bonded to the inner surface of the window panel, which seals against the perimeter edge, allowing separate formation and attachment to the window panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional encapsulation molding is used around the periphery of the glass window panel, then the window assembly is sealed and protected, but the manufacturing cost increases due to the need for large tools and molds
Solution Approach 1:
The frame is divided into an inner frame portion and an outer frame portion that can be manufactured separately and then assembled. The inner frame portion is adhesively bonded to the window panel while the outer frame portion is overmolded onto it, eliminating the need for a single large encapsulation mold and reducing manufacturing costs while maintaining sealing effectiveness
Solution Approach 2:
The attachment approach is moved from the outer surface to the inner surface of the window panel. The inner frame portion is bonded to the inner surface, allowing the outer frame portion to overlap and seal the perimeter edge from the outside, achieving both cost reduction and aesthetic appearance
2Reliability
If the frame overlaps the outer surface of the window panel, then the seal is enhanced, but the appearance is compromised with visible frame material on the glass surface
Solution Approach 1:
The sealing function is relocated to the outer frame portion that overlaps the perimeter edge from the exterior side, while the attachment function is performed by the inner frame portion bonded to the inner surface. This spatial separation allows the seal to be effective without compromising the aesthetic appearance of the outer surface
Solution Approach 2:
The attachment function is extracted from the outer frame portion and assigned to the inner frame portion. This allows the outer frame portion to focus solely on sealing and aesthetic functions, overlapping only where necessary at the perimeter edge while maintaining a clean appearance
3Device complexity
If a single-piece frame is used, then the structure is simple, but the manufacturing cost increases and flexibility is reduced
Solution Approach 1:
The frame is segmented into an inner frame portion for attachment and an outer frame portion for sealing and aesthetics. This segmentation allows each component to be manufactured using optimized processes and assembled separately, reducing overall manufacturing cost while maintaining structural integrity
Solution Approach 2:
The inner and outer frame portions are combined through overmolding, where the outer frame portion is molded over the inner frame portion. This creates a unified, integrated frame structure with improved functionality while avoiding the need for complex single-piece manufacturing
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
Enables cost-effective assembly of large windows by forming the frame separately and bonding it to the inner surface, maintaining a seamless appearance and providing a robust seal without overlapping the outer surface.
Implementation Method 1
The outer frame portion comprises a polymeric portion that is overmolded at an outer surface of the inner frame portion
Implementation Method 2
The inner frame portion comprises an attaching element that is adhesively bonded at the inner side of the window panel to attach the perimeter frame to the window panel
Data Source
AI summary
A method for manufacturing a vehicular window assembly includes providing a window panel having an inner side and an outer side separated by a thickness of the window panel and having a perimeter edge that spans between the inner side and the outer side. A plastic inner frame portion of a perimeter frame is molded. A polymeric outer frame portion of the perimeter frame is overmolded at a first side of the inner frame portion. The inner frame portion includes a first material and the outer frame portion includes a second material different from the first material. An attachment element of the inner frame portion is adhesively bonded at the inner side of the window panel to attach the perimeter frame to the window panel. With the attachment element adhesively bonded at the inner side, the outer frame portion receives and seals against the perimeter edge of the window panel.