Rollover Protective Body Deformation Cross Bar Energy Absorption

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Solution Overview

Problem

Rollover protective devices for motor vehicles lack improved mechanical properties and energy absorption capabilities in the event of a crash, which can lead to inadequate protection for vehicle occupants during rollovers.

Innovation Solution

Incorporating reinforcing bodies made of metallic or plastic materials, such as fiber-reinforced polyamide, into the hollow profile body of the deformation cross bar, which can be fixed using local hook-behind elements and designed with specific geometries and shapes to enhance mechanical stability and energy absorption, including conical penetration elements for rear window penetration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a hollow profile body deformation cross bar is used, then energy absorption is improved, but mechanical stability deteriorates

Engineering Contradiction:

Improveenergy absorptionVSAvoidmechanical stability

Core Design Contradiction:

Loss of energyVSStability of the object's composition

Solution Approach 1:

A reinforcing body is inserted into the hollow profile body of the deformation cross bar, creating a nested structure where the reinforcing body is contained within the hollow profile. This nested configuration allows the hollow profile to maintain its energy absorption capabilities through controlled deformation while the inner reinforcing body provides enhanced mechanical stability and structural integrity during crash events.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Stability of the object's composition

If the deformation cross bar structure is reinforced, then mechanical stability is improved, but energy absorption capability deteriorates

Engineering Contradiction:

Improvemechanical stabilityVSAvoidenergy absorption

Core Design Contradiction:

Stability of the object's compositionVSLoss of energy

Solution Approach 1:

The reinforcing body is strategically positioned within the hollow profile body at specific locations where structural support is most needed. This localized reinforcement approach enhances mechanical stability at critical points while allowing other regions of the deformation cross bar to maintain their energy absorption characteristics through controlled deformation, achieving both stability and energy absorption simultaneously.

Inventive Principle:

Principle #3Local quality

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 solution significantly improves the mechanical stability and energy absorption of the deformation cross bar, reducing the mechanical load on the supporting structure and increasing the deformation travel, thereby enhancing the protective capabilities during rollover events.

Implementation Method 1

the reinforcing body is capable of both increasing the mechanical stability and absorbing energy during a deformation in the event of a crash

Methodology Applied

Scientific EffectEnergy absorption: Deformation

Implementation Method 2

the deformation cross bar comprises a hollow profile body and forms a defined predetermined deformation point for a limited, defined deformation travel in the load direction

Methodology Applied

Scientific EffectDeformation: Deformation

Data Source

PatentUS10328882B2Rollover protective body for a rollover protective device of a motor vehicle

Publication Date: 2019.06.25 DR ING H C F PORSCHE AG

AI summary

A rollover protective device for a motor vehicle has a rollover protective body (1) with a top side. A deformation cross bar (2) is attached to the top side of the rollover protective body (1) and has hollow profile body (3). The deformation cross bar (2) has at least one reinforcing body (4) inserted into the hollow profile body (3).