Window Wiper Sealing Strip With Scalable Fairing and Variable Section
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Solution Overview
Problem
Existing window wipers for motor vehicle doors face challenges in scalability, manufacturing complexity, and rigidity, particularly in achieving a varying section and shape along the longitudinal direction without increasing production costs or compromising rigidity.
Innovation Solution
A window wiper design featuring a first extruded portion and a second portion with an insert and overmolding, allowing for a varying section and improved rigidity, where the insert is clipped into the extruded portion and the overmolding covers at least part of the insert, enabling a break between the two portions for enhanced flexibility and attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional extruded weatherstrip is used, then the manufacturing process is simple, but the cross-section cannot be adjusted along the length of the weatherstrip
Solution Approach 1:
The weatherstrip is divided into a first portion (extruded) and a second portion (with insert and overmolding), allowing different sections to have different cross-sectional characteristics while maintaining manufacturing efficiency
Solution Approach 2:
The insert is placed inside the overmolding, creating a nested structure where the insert provides structural support and the overmolding provides the desired cross-sectional shape and sealing properties
2Adaptability or versatility
If bi-injection weatherstrips are used to allow section evolution, then the cross-section can vary along the weatherstrip, but the weatherstrip becomes longer and more difficult to manufacture
Solution Approach 1:
The weatherstrip is segmented into portions with different manufacturing methods, combining simple extrusion for the first portion with insert and overmolding for the second portion to achieve section variation without bi-injection complexity
Solution Approach 2:
The insert acts as an intermediary element that enables section variation by providing a core structure around which the overmolding is formed, allowing complex shapes without complex manufacturing processes
3Adaptability or versatility
If molding techniques are used to vary the section, then the cross-section can change along the longitudinal direction, but the manufacturing process becomes time-consuming and expensive
Solution Approach 1:
The weatherstrip manufacturing is segmented into efficient extrusion for the first portion and insert-overmolding for the second portion, avoiding time-consuming full-length molding while achieving section variation where needed
Solution Approach 2:
The insert and overmolding are applied only to the second portion of the weatherstrip where section variation is needed, rather than the entire length, maintaining productivity while achieving local adaptability
4Adaptability or versatility
If molding techniques are used to vary the section, then the cross-section can change along the longitudinal direction, but the rigidity of the weatherstrip may be insufficient
Solution Approach 1:
The weatherstrip combines different materials and structures - the extruded first portion and the insert-overmolding second portion - creating a composite structure that achieves both section variation and enhanced rigidity
Solution Approach 2:
The insert is nested within the overmolding, creating a reinforced structure where the insert provides internal support and the overmolding provides external shape, together delivering both variability and rigidity
Data Source
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AI summary
The invention relates to a sealing strip (10), in particular an exterior movable window sealing strip for a door (1) of a motor vehicle, comprising: a first extruded portion (11) configured to press against a movable window (1) of a door (1) of a motor vehicle, and a second portion (12) adjacent to the first portion (11) and comprising an insert (20) fixed to the first portion (11) and comprising an overmolding (30) at least partially covering said insert (20).