Vehicle Outer Belt Molding with Compliant Sealing Arms
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Solution Overview
Problem
Existing outer belt moldings for automotive vehicles fail to effectively seal the gap between the vehicle door and window pane, particularly in preventing water ingress and ensuring structural rigidity, especially in cold weather conditions.
Innovation Solution
The outer belt molding features a body portion with a cap and anti-rattle bumper, a compliantly coupled window sealing arm forming an acute angle, and a body sealing arm that articulates to enhance sealing, along with a metallic carrier for structural rigidity and polymeric materials with varying durometer hardness for optimal contact and sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid structure is used for the outer belt molding body, then structural rigidity is improved, but sealing effectiveness against water ingress deteriorates
Solution Approach 1:
The outer belt molding is divided into a rigid body portion and separate compliant sealing arms (window sealing arm and body sealing arm). The rigid body provides structural strength while the compliant arms provide sealing effectiveness, resolving the contradiction between rigidity and sealing.
Solution Approach 2:
Different parts of the molding have different material properties: the body portion uses a harder polymeric material for rigidity, while the sealing arms use a softer polymeric material with lower durometer hardness for compliance and sealing. This local differentiation resolves the contradiction between overall structural rigidity and localized sealing effectiveness.
2Ease of manufacture
If a single rigid material is used for the entire outer belt molding, then manufacturing simplicity is improved, but adaptability to window movement and sealing performance deteriorates
Solution Approach 1:
The molding uses polymeric materials with varying durometer hardness in different locations - the body portion has higher hardness for structural integrity, while the sealing arms have lower hardness for compliance. This allows the structure to adapt to window movement while maintaining manufacturability through injection molding of multi-durometer materials.
Solution Approach 2:
The sealing arms are designed to be compliant and articulable, allowing them to dynamically adjust their position and shape in response to window movement and installation variations. This dynamic compliance provides adaptability while the overall structure remains manufacturable as a single integrated component.
3Reliability
If the window sealing arm is made from a softer polymeric material, then sealing compliance is improved, but structural strength of the arm deteriorates
Solution Approach 1:
The window sealing arm uses a polymeric material with lower durometer hardness than the body portion, providing compliance for effective sealing contact. The metallic carrier disposed within the body portion and extending into the sealing arm provides additional structural reinforcement, allowing the softer material to maintain both compliance and sufficient strength.
Solution Approach 2:
The sealing arm is formed as a composite structure combining a softer polymeric material for compliance with a metallic carrier for structural reinforcement. This composite approach allows the arm to achieve both sealing compliance and structural strength simultaneously.
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
The solution provides a robust and effective water-resistant seal, ensuring structural integrity and preventing water ingress while allowing for smooth window operation, even in cold weather, by utilizing a combination of compliant articulation and metallic reinforcement.
Implementation Method 1
The window sealing arm is compliantly coupled to the body portion at a location between the cap and the anti-rattle bumper, and forms an acute angle with the first end of the body portion. The window sealing arm is articulable between a first position and a second position relative to the body portion
Implementation Method 2
a body sealing arm is compliantly coupled to the window sealing arm and extends toward the body portion. Contact between the body sealing arm and the body portion may be configured to urge the body sealing arm to articulate towards the window sealing arm
Implementation Method 3
A metallic carrier may be disposed within the body portion of the outer belt molding to provide further structural rigidity. The metallic carrier may further extend into at least one of the cap and the anti-rattle bumper of the outer belt molding
Implementation Method 4
the polymeric material of the window sealing arm may have a lower durometer hardness than the polymeric material of the body portion
Data Source
AI summary
An outer belt molding for a vehicle includes a body portion having a first end and a second end. A cap is disposed at the first end of the body portion, and an anti-rattle bumper is disposed at the second end of the body portion. A window sealing arm is compliantly coupled to the body portion at a location between the cap and the anti-rattle bumper, and forms an acute angle with the first end of the body portion. Additionally, a body sealing arm is compliantly coupled to the window sealing arm and extends toward the body portion.