Sealing Lip Length Variation in Commercial Vehicle Seals

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Solution Overview

Problem

Existing sealing arrangements in commercial vehicle bodies, particularly in refrigerated boxes, suffer from leakage in corner areas due to excessive deformation of sealing lips, which compromises the sealing effectiveness and allows heat exchange and contamination.

Innovation Solution

A sealing arrangement with a sealing lip that has a shorter extension in the corner area compared to other areas, reducing deformation and ensuring complete contact with the edge of the opening, combined with multiple sealing lips and a dust lip for enhanced sealing and protection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If sealing lips are made longer to ensure complete coverage of the opening edge, then sealing effectiveness is improved, but deformation and folding in corner areas increases causing leakage

Engineering Contradiction:

Improvesealing effectivenessVSAvoiddeformation of sealing lip

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The sealing lip is designed with varying lengths in different areas: longer in straight sections to ensure complete coverage and sealing effectiveness, and shorter in corner areas to reduce deformation and folding. This local differentiation resolves the contradiction by optimizing each area's sealing lip length according to its specific functional requirements.

Inventive Principle:

Principle #3Local quality

2Shape

If sealing lips are shortened in corner areas to reduce deformation, then leakage in corners is reduced, but sealing coverage in those areas may be insufficient

Engineering Contradiction:

Improvedeformation of sealing lipVSAvoidsealing effectiveness

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The sealing lip configuration uses local quality by making corner area sealing lips shorter to minimize deformation while maintaining adequate coverage, and straight section sealing lips longer to ensure complete edge coverage. This localized optimization resolves the contradiction between reducing deformation and maintaining sealing effectiveness in different areas.

Inventive Principle:

Principle #3Local quality

3Reliability

If multiple sealing lips are used to improve sealing, then sealing effectiveness is enhanced, but device complexity increases

Engineering Contradiction:

Improvesealing effectivenessVSAvoidsealing arrangement structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The sealing arrangement is segmented into multiple sealing lips that are distributed around the opening perimeter, with each lip independently configured according to its local requirements (longer in straight sections, shorter in corners). This segmentation approach enhances sealing effectiveness while keeping each individual lip simple in structure.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP3647095B1Commercial vehicle structure and sealing assembly for use in a commercial vehicle structure

Publication Date: 2021.03.10 FAHRZEUGWERK BERNARD KRONE GMBH & CO KG

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AI summary

The object of the invention is to provide a commercial vehicle body and a sealing arrangement for use in a commercial vehicle body that achieve an improved sealing effect in a simple and cost-effective manner. According to the invention, this is achieved by the sealing lip (14) of a sealing arrangement (10) having a smaller extension away from the base body (12) of the sealing arrangement (10) in a corner region (16) than in at least one region of the sealing arrangement (10) located outside the corner region (16).