Composite Door Weather Strip for Stable Sealing Contact
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Solution Overview
Problem
Conventional door weather strips made of sponge rubber suffer from deflection and deformation during extrusion molding, leading to reduced attachment work efficiency and seal performance due to differences in shrinkage and foaming ratios between solid and sponge rubber components, resulting in insufficient press contact force and compromised sealing.
Innovation Solution
Incorporating hard rubber into the interior of the attachment base part, hollow seal part, and connection part of the door weather strip to enhance rigidity, thereby suppressing deflection and deformation, ensuring stable attachment and improved sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sponge rubber is used for the hollow seal part and connection part, then sealing flexibility is improved, but deflection and deformation occur during molding and after time lapse
Solution Approach 1:
The patent applies composite materials by combining sponge rubber and solid rubber within the same component. The hollow seal part contains solid rubber particles dispersed in the sponge rubber matrix, creating a composite structure that maintains the flexibility of sponge rubber while gaining the dimensional stability of solid rubber, thereby preventing deflection and deformation during molding and over time.
Solution Approach 2:
The patent applies local quality by creating regions with different material properties within the same component. The hollow seal part has a composite structure where solid rubber particles are concentrated in specific areas to provide localized rigidity and shape stability, while the surrounding sponge rubber maintains flexibility for sealing functionality.
2Strength
If solid rubber is used for the attachment base part, then rigidity is improved, but attachment work efficiency deteriorates due to deformation
Solution Approach 1:
The attachment base part uses a composite structure with solid rubber particles embedded in sponge rubber. This provides sufficient rigidity for stable attachment while maintaining the flexibility and ease of deformation needed for efficient manual attachment work, resolving the contradiction between rigidity and attachment efficiency.
3Reliability
If different rubber materials are used for different parts, then functional performance is improved, but manufacturing precision deteriorates due to different shrinkage
Solution Approach 1:
The patent uses composite materials with solid rubber particles dispersed in sponge rubber throughout the hollow seal part and connection part. This allows the component to be molded as a single piece with uniform shrinkage characteristics, ensuring high dimensional accuracy while maintaining the functional benefits of different rubber properties in different regions.
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 integration of hard rubber within the door weather strip components maintains structural integrity, enhancing attachment efficiency and sealing performance by maintaining press contact force and preventing deformation, thus improving door closure and appearance.
Implementation Method 1
a hard rubber is buried to each of insides of a base bottom portion 23a of the hollow seal part 23 and the connection part 24
Implementation Method 2
comes in elastic contact with a vehicle body panel so as to be deflected and deformed in a door closed state
Data Source
AI summary
A door weather strip includes an attachment base part attached to a door sash part. The attachment base part has at least a part made of a hard rubber. The door weather strip includes a hollow seal part made of a soft rubber. The hollow seal part has a base bottom portion disposed so as to come in contact with the outer surface of a door inner panel, and comes in contact with a body outer panel so as to be deflected and deformed in a door closed state. The door weather strip includes a connection part made of soft rubber connecting the base bottom portion of the hollow seal part with the attachment base part and hard rubber buried inside the base bottom portion and connection part.