Composite Wheel Safety Insert for Heavy-Vehicle Tire Collapse

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Solution Overview

Problem

Existing wheel safety systems fail to provide sufficient support for heavy vehicles like trucks during tire collapse, as they lack the necessary resistance while maintaining low weight and cost.

Innovation Solution

A wheel safety system with a safety means comprising a central element and lateral elements made of different materials, including a tire-like structure with a central portion and pouch-like lateral elements, which are inflated using a closed-loop control system to occupy the space between the tire and rim, providing enhanced support by expanding polyurethane foam and adhering to the tire.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If existing air bag systems are used to support the vehicle in case of tire collapse, then the driver can safely stop the vehicle, but the structure cannot achieve sufficient resistance to support the loads of heavy vehicles such as trucks

Engineering Contradiction:
Improvesupport capacityVSAvoidsafety
Core Design Contradiction:
StrengthVSReliability

Solution Approach 1:

The safety means comprises a central element and lateral elements made of different materials. The central element includes a core element (12a) made of polyurethane foam surrounded by an elastic casing (12b), while the lateral elements are made of rigid material. This composite structure provides both the strength needed to support heavy vehicle loads and the reliability for safe stopping, resolving the contradiction between support capacity and safety.

Inventive Principle:
Principle #40Composite materials

2Strength

If a stronger safety structure is provided to support heavy vehicle loads, then the support capacity increases, but the weight and cost increase

Engineering Contradiction:
Improvesupport capacityVSAvoidweight
Core Design Contradiction:
StrengthVSWeight of moving object

Solution Approach 1:

Different parts of the safety means have different material properties optimized for their specific functions. The core element (12a) uses lightweight polyurethane foam for buoyancy and basic support, the elastic casing (12b) provides flexible containment, and only the lateral elements use rigid material where structural strength is critically needed. This localized differentiation achieves high support capacity for heavy vehicles while minimizing overall weight.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The safety means is divided into multiple functional segments: a central element (11) for primary support, lateral elements (12) for structural reinforcement, and an elastic casing (12b) for containment. This segmentation allows each component to be optimized independently, using materials and designs appropriate to its specific mechanical requirements, thereby achieving high strength-to-weight ratio.

Inventive Principle:
Principle #1Segmentation

3Strength

If a more complex safety system is designed to provide sufficient resistance, then the support capacity improves, but the manufacturing cost increases

Engineering Contradiction:
Improvesupport capacityVSAvoidmanufacturing cost
Core Design Contradiction:
StrengthVSEase of manufacture

Solution Approach 1:

The safety means is segmented into modular components (central element 11, lateral elements 12, elastic casing 12b) that can be manufactured separately and assembled. The core element (12a) can be produced using standard foam molding techniques, the elastic casing (12b) using conventional rubber molding, and the lateral elements using rigid material forming. This modularity simplifies manufacturing processes and reduces tooling costs compared to producing a single complex integrated structure.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Each component is manufactured using the most cost-effective process appropriate to its material and function: foam injection molding for the core element, elastic molding for the casing, and standard forming for rigid lateral elements. This avoids using expensive manufacturing processes throughout the entire structure, reducing overall production cost while maintaining the required support capacity.

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 system offers a stronger, more effective load support similar to a real tire, allowing safe stopping for heavy vehicles, while being lightweight and cost-effective, and can be integrated into various wheel typologies without modifying existing profiles.

Implementation Method 1

a safety means 8, advantageously housed in the seat 6 and configured to be inflated to occupy all the closed space 7

Methodology Applied
Scientific EffectPressurisation: Pressurisation

Implementation Method 2

the core element 12a comprises polyurethane foam while the casing 12b is realized in elastic material

Methodology Applied
Scientific EffectFoam expansion: Foam

Data Source

PatentEP3878668B1Wheel for a vehicle comprising an improved safety system
Publication Date: 2023.12.20 CNH IND ITALIA SPA
  • EP3878668B1 patent drawingFigure 1
  • EP3878668B1 patent drawingFigure 2
  • EP3878668B1 patent drawingFigure 3

AI summary

Wheel (3) for a vehicle (1) comprising a rim (5) configured to be coupled to a hub of the vehicle and a tire (4) cooperating at contact with the rim (5) to define a closed space (7) and safety means (8) housed into the closed space (7) and configured to be inflated when the pressure in the closed space (7) decreases below a preset threshold, the safety means (8) comprises a central element (11) and a first and a second lateral elements (12) respectively interposed forward and rearward to the central element (11), the central element (11) and said lateral elements (12) being realized in different materials, the central element (11) being configured to be inflated when the pressure in the closed space (7) decreases below a preset threshold, and carry the lateral elements (12) till they contact the tire (4) .