Integral Cowl Side Trim With Breakage Lines for Side Impact Absorption
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Solution Overview
Problem
Existing vehicle designs lack sufficient protection for occupants during side collisions, with the cowl side being a weak area that increases damage and rigidity requirements, and conventional reinforcement methods complicate manufacturing and assembly.
Innovation Solution
An integral cowl side trim with a footrest part and breakage forming features, including ribs and notch grooves, allows for easy separation upon impact, reducing manufacturing costs and enhancing occupant protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a reinforcing material is disposed on the inner side of the cowl side to improve rigidity, then the rigidity of the body is improved, but the manufacturing complexity and assembly time increase due to welding requirements
Solution Approach 1:
The cowl side trim integrates the reinforcing material and the trim component into a single integrated structure. The trim body itself is designed with internal reinforcement features, eliminating the need for separate reinforcing materials and welding operations. This merging approach maintains the required rigidity while simplifying manufacturing and assembly processes.
2Device complexity
If structural adhesive is used instead of welding to avoid welding complexity, then the manufacturing process is simplified, but the cycle time becomes longer
Solution Approach 1:
The cowl side trim is designed with pre-formed coupling protrusions and corresponding coupling grooves that enable mechanical interlocking. This preliminary structural design allows for rapid assembly through simple insertion and clicking actions, eliminating both welding and adhesive application steps while maintaining connection strength and reducing cycle time.
3Device complexity
If the cowl side trim is made as a single integral structure, then the manufacturing process is simplified, but the ability to absorb impact energy is reduced
Solution Approach 1:
The cowl side trim is designed as an integral structure with built-in breakage lines that create segmented failure zones. These breakage lines include notch grooves and rib structures positioned to facilitate controlled fracture during side impact collisions. The integral manufacturing maintains simplicity, while the embedded segmentation features enable progressive energy absorption through controlled breaking sequences.
4Loss of energy
If the cowl side trim is designed with breakage lines for impact absorption, then the impact energy absorption is improved, but the structural strength is reduced
Solution Approach 1:
The cowl side trim employs local quality variations through strategically positioned breakage lines with different geometric features. Notch grooves provide stress concentration points for controlled initiation, while rib structures provide localized reinforcement. The breakage lines are positioned in non-critical areas, maintaining structural strength in load-bearing regions while enabling energy absorption through controlled fracture in designated zones.
Data Source
AI summary
A cowl side trim is configured to be installed on a cowl side panel on a driver side of a vehicle. The cowl side trim includes a cowl part installed on the cowl side panel at a position adjacent to a door of the vehicle, a footrest part integrally formed with the cowl part, and a breakage forming part formed along a boundary line dividing a rear surface of the cowl part and a rear surface of the footrest part.