Vehicle Door Sash and Weatherstripping for Corner Seal Stability

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing vehicle doors with weatherstripping attached by double-faced adhesive tape exhibit low followability and may not allow for a reduced sectional area of the sash, leading to potential displacement and reduced sealability, especially at corners.

Innovation Solution

A vehicle door design featuring a sash with a first member formed through roll forming and a second member through press forming, combined with a weatherstripping that includes movable linear sections and clips to prevent displacement, ensuring satisfactory followability and increased sealability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the weatherstripping is attached to the vehicle door with double-faced adhesive tape, then the weatherstripping is fixed to the door, but the followability is low and displacement occurs

Engineering Contradiction:

ImprovesealabilityVSAvoidfollowability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The weatherstripping is designed with movable linear sections that can dynamically adjust along the sash members during door operation. This allows the weatherstripping to maintain contact with the vehicle body while accommodating movements and deformations, significantly improving followability compared to fixed adhesive attachment

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The weatherstripping is divided into multiple linear sections (first linear section, second linear section) that can move independently along the sash members. This segmentation allows each section to adapt to local conditions and movements, enhancing overall followability and sealability

Inventive Principle:

Principle #1Segmentation

2Strength

If the sash is obtained through press forming to include the corner, then the structural strength is improved, but the sectional area is larger

Engineering Contradiction:

Improvestructural strengthVSAvoidsash sectional area

Core Design Contradiction:

StrengthVSArea of moving object

Solution Approach 1:

Different portions of the sash are formed using different methods: the first member (roof section) is obtained through roll forming with a smaller sectional area, while the second member (pillar section including corner) is obtained through press forming to provide structural strength where needed. This local differentiation optimizes both area and strength

Inventive Principle:

Principle #3Local quality

3Stability of the object's composition

If the weatherstripping is restrained excessively, then the position is fixed, but the followability is low

Engineering Contradiction:

Improveposition stabilityVSAvoidfollowability

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The attachment mechanism allows the weatherstripping to change its positional parameters dynamically - it can move along the elongate direction of the sash members while maintaining attachment. This parameter flexibility enables both stability and followability

Inventive Principle:

Principle #35Parameter changes

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 design enhances weatherstripping followability and sealability, reducing the likelihood of displacement and water ingress, while allowing for a reduced sash sectional area and increased design freedom at corners.

Implementation Method 1

The first member is obtained through roll forming

Methodology Applied

Scientific EffectRoll forming:

Implementation Method 2

The second member is obtained through press forming in such a manner as to include the corner

Methodology Applied

Scientific EffectPress forming:

Implementation Method 3

The weatherstripping is made of an elastic material such as rubber and is to seal between the vehicle body and the vehicle door

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS12528345B2Vehicle door

Publication Date: 2026.01.20 SUBARU CORP

AI summary

A vehicle door provided with a weatherstripping includes a sash. The sash includes a first member designed to extend along a roof of a vehicle body, and a second member designed to extend along a pillar of the vehicle body. The weatherstripping includes a first linear section designed to extend along the roof, a second linear section designed to extend along the pillar, and a corner section coupling the first linear section and the second linear section to each other. The first member is obtained through roll forming. The second member is obtained through press forming in such a manner as to include the corner. The second linear section and the corner section lie on the second member. The first linear section and the second linear section are each provided on a side near the corner section with a movement preventing member configured to prevent the weatherstripping from moving.