Variable Cross-Section Door Frame Weather Strip Fixing

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Solution Overview

Problem

In frame door-type vehicles, applying a door frame molding with a variable cross-section is challenging due to the difficulty in manufacturing an opening weather strip with a corresponding variable shape, leading to gaps between the door frame and vehicle body, allowing dust and rain to enter, and increasing manufacturing costs and failure rates.

Innovation Solution

A fixing structure comprising a door frame molding with a variable cross-section and an opening weather strip fixing molding that adjusts its height to match the door frame's varying width, using a resin portion with hooks and protrusions to secure the weather strip, allowing a uniform cross-section weather strip to be used effectively, sealing the gap between the door frame and vehicle body.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If an opening weather strip with a variable cross-section is manufactured by injection molding to match the door frame molding, then the door frame molding with variable cross-section can be applied to the entire door, but the manufacturing cost is significantly increased and the failure rate is increased

Engineering Contradiction:

Improveadaptability of door frame moldingVSAvoidreliability of opening weather strip

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The opening weather strip is divided into two separate components: a first opening weather strip with a fixed cross-section and a second opening weather strip with a variable cross-section. This segmentation allows each component to be optimized independently - the first part can be manufactured by extrusion for high reliability, while the second part can be injection-molded to match the variable door frame molding geometry

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different sections of the opening weather strip have different cross-sectional characteristics. The first opening weather strip maintains a uniform cross-section suitable for extrusion manufacturing, while the second opening weather strip has a variable cross-section that matches the door frame molding. This local differentiation resolves the contradiction by applying different manufacturing approaches to different functional requirements

Inventive Principle:

Principle #3Local quality

2Reliability

If an opening weather strip with a uniform cross-section is used to maintain excellent quality, then the manufacturing cost is reduced, but gaps are formed between the door frame and vehicle body, allowing dust and rain to enter

Engineering Contradiction:

Improvequality of opening weather stripVSAvoiddust and rain penetration

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The opening weather strip is segmented into two parts: the first opening weather strip with uniform cross-section that maintains excellent quality and is manufactured by extrusion, and the second opening weather strip with variable cross-section that ensures proper sealing against the vehicle body. This segmentation allows both quality and sealing performance to be achieved simultaneously

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first opening weather strip has a uniform cross-section optimized for extrusion manufacturing and quality, while the second opening weather strip has a variable cross-section optimized for sealing against the variable door frame molding. This local quality differentiation resolves the contradiction between manufacturing quality and sealing effectiveness

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If the opening weather strip is formed with a variable shape to match the door frame molding, then the sealing portion matches the vehicle body, but the manufacturing complexity increases and quality decreases

Engineering Contradiction:

Improvesealing performanceVSAvoidquality of opening weather strip

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The opening weather strip is divided into a first section with uniform cross-section manufactured by extrusion for high quality, and a second section with variable cross-section manufactured by injection molding for proper sealing. This segmentation allows the sealing function to be achieved without compromising the overall quality of the weather strip

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different sections of the opening weather strip have different cross-sectional characteristics tailored to their specific functions. The first section maintains uniform dimensions for high-quality extrusion manufacturing, while the second section varies in cross-section to match the door frame molding and ensure sealing. This local quality approach resolves the contradiction between sealing performance and manufacturing quality

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS8302350B2Fixing structure of opening weather strip for vehicle

Publication Date: 2012.11.06 KIA CORPORATION

AI summary

A fixing structure of an opening weather strip for a vehicle may include a door frame molding having a variable cross-sectional width and installed at a front end portion of a door frame, an opening weather strip fixing molding having a cross-sectional height, which varies according to the variable width of the door frame molding and installed at a top end portion of the door frame, and the opening weather strip mounted between the opening weather strip fixing molding and the door frame molding and supported upwards by the opening weather strip fixing molding with a predetermined height to match a vehicle body, thus sealing a space between the vehicle body and the door frame.