Vehicle Door Glass Run Corner Molding Against Flange Deformation
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Solution Overview
Problem
Existing glass runs for vehicle doors suffer from flexural deformation when attaching the die molding portion to the window frame, leading to positional displacement and a compromised external appearance due to the low rigidity of the thin ribs.
Innovation Solution
Incorporating a supporting portion within the die molding portion that acts as a stopper to resist the pressing force, preventing excessive deformation by abutting against the end flange portion of the outer panel, and optionally providing reinforcing ribs or varying thicknesses in the supporting portion for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer peripheral portion is pressed down to attach the die molding portion to the window frame, then the glass run can be fixed to the window frame, but the outer peripheral portion undergoes flexural deformation causing positional displacement
Solution Approach 1:
The patent changes the physical parameters of the die molding portion by adding a supporting portion with increased thickness (greater than 3mm) and higher rigidity. This structural parameter change allows the outer peripheral portion to resist flexural deformation during attachment while maintaining positioning precision of the glass run on the window frame.
Solution Approach 2:
The patent segments the die molding portion into functionally distinct regions: the outer peripheral portion for positioning, the supporting portion for structural reinforcement, and the holding portion for attachment. This segmentation allows each part to perform its specific function optimally without interfering with others.
2Quantity of substance
If the ribs are made thin to reduce material usage, then manufacturing cost decreases, but the rigidity becomes insufficient to resist pressing force
Solution Approach 1:
The patent applies local quality by making the supporting portion thicker (greater than 3mm) only where structural reinforcement is needed, while keeping other portions thinner to reduce overall material usage. This localized thickness increase provides the necessary rigidity to resist pressing force during attachment without significantly increasing total material consumption.
Solution Approach 2:
The patent creates a composite structural design within the die molding portion, combining thin-walled sections for material efficiency with a thickened supporting portion for structural strength. This composite approach optimizes the balance between material usage and rigidity.
3Ease of operation
If the outer peripheral portion is pressed down for attachment, then the glass run can be installed on the window frame, but the external appearance deteriorates due to deformation
Solution Approach 1:
The patent incorporates the supporting portion in advance during manufacturing, before installation. This preliminary structural reinforcement ensures that when pressing force is applied during installation, the outer peripheral portion maintains its shape and does not deform, thus preserving external appearance while allowing easy installation.
4Strength
If the supporting portion is made thicker to increase rigidity, then flexural deformation is suppressed, but manufacturing complexity increases
Solution Approach 1:
The patent merges the supporting portion with the outer peripheral portion and holding portion into a single integrated die molding portion. This combination allows the thickened supporting structure to be manufactured in one piece using standard die molding processes, avoiding the need for separate components or complex assembly operations.
Data Source
AI summary
A corner die-molding portion of a glass run includes an outer peripheral portion to cover an end flange portion of an outer panel of a door, a holding portion having one end portion connected to an inner surface of the outer peripheral portion, and a supporting portion provided between the holding portion and the inner surface of the outer peripheral portion. An inner space and its opening are provided between the outer peripheral portion and the holding portion such that, when the glass run is attached to a window frame, the end flange portion of the outer panel is inserted into the inner space from the opening, and then the supporting portion is brought into abutment against a tip end of the end flange portion of the outer panel. It is possible to suppress flexural deformation of the outer peripheral portion, thereby improving the glass run in external appearance.