Heavy Load Tyre Belt Structure Segmentation
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Solution Overview
Problem
Heavy load vehicle tires face reduced service life due to thermal-mechanical stresses causing micro-lacerations and fatigue, leading to irregular wear and vibrations, which are exacerbated by increased load indices and travel speeds, necessitating a stronger belt structure to withstand more stress cycles and allow for tread band reconstructions.
Innovation Solution
A tire design featuring three radially innermost belt layers: a first belt layer with reinforcing elements oriented in various directions, a central belt layer with elements oriented circumferentially, and lateral reinforcing layers, along with a sheet of elastomeric material between the first and second belt layers, to distribute deformations and reduce strain on the elastomeric material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the belt structure is strengthened to withstand more stress cycles, then service life is improved, but device complexity increases due to multiple belt layers
Solution Approach 1:
The belt structure is divided into multiple functional layers: a first belt layer with circumferential reinforcing elements, a second belt layer with inclined reinforcing elements, and a third belt layer with circumferential reinforcing elements. Each layer serves a specific function in distributing different types of stresses, allowing the structure to withstand more stress cycles and extend service life while maintaining manageable complexity through functional segmentation.
Solution Approach 2:
The patent employs composite material construction by combining different types of reinforcing elements (circumferential and inclined) in multiple layers within the belt structure. This composite approach allows the belt to resist various stress components simultaneously, improving durability and service life under heavy load conditions without requiring excessive material in a single configuration.
2Strength
If the belt structure uses multiple layers to distribute deformations, then stress resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The belt structure is segmented into three distinct layers, each with specific reinforcing element orientations. The first and third layers provide circumferential strength to resist radial forces, while the second layer with inclined elements distributes shear stresses. This segmentation improves stress resistance while allowing each layer to be manufactured and positioned with clear functional requirements, simplifying the overall manufacturing process compared to a monolithic complex structure.
Solution Approach 2:
Each belt layer is designed with local quality characteristics: the first and third layers have circumferential reinforcing elements optimized for radial force resistance, while the second layer has inclined elements specifically positioned to handle shear stresses. This localized optimization of material properties and orientations in different regions of the belt structure enhances overall stress resistance while maintaining manufacturing feasibility through standardized layer construction.
3Stability of the object's composition
If the reinforcing elements are oriented in various directions, then deformation distribution is improved, but structural complexity increases
Solution Approach 1:
The belt structure segments reinforcing elements into different orientation groups across three layers: circumferential orientation in the first and third layers for radial force resistance, and inclined orientation in the second layer for shear stress distribution. This segmentation achieves comprehensive deformation distribution while maintaining structural clarity and manageability through distinct functional zones.
Solution Approach 2:
The patent employs asymmetric orientation of reinforcing elements: the first and third layers use circumferential orientation while the second layer uses inclined orientation at specific angles. This asymmetric arrangement optimizes deformation distribution by matching element orientation to the dominant stress direction in each layer, improving structural efficiency without requiring symmetric complexity throughout the entire belt structure.
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
This configuration significantly reduces fatigue cycles and strain on the tire's reinforcing elements, enhancing service life by distributing deformations and reducing heat generation, thereby improving stress resistance and reconstructability of the tire.
Implementation Method 1
a sheet of elastomeric material between the first and second belt layers, to distribute deformations and reduce strain on the elastomeric material
Implementation Method 2
thermal-mechanical stresses exerted on the belt structure of the tyre, can trigger micro-lacerations which, upon propagation, reduce the service life thereof
Data Source
Figure 1
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AI summary
A tyre (100) for heavy duty vehicle wheels comprising: - a carcass structure (101); and - a belt structure (105); and - a tread band (106), wherein the belt structure (105) comprises: - a first belt layer (105a) incorporating reinforcing elements, oriented in one or more directions, and selected from cords made of non- metallic material; - a second belt layer (105b) applied on the first belt layer (105a) and comprising: i) a pair of lateral reinforcing layers (113) positioned at axially outer ends of said second belt layer (105b), said lateral reinforcing layers (113) incorporating reinforcing elements oriented along a substantially circumferential direction, and ii) a central belt layer (114) axially interposed between said pair of lateral reinforcing layers (113) and incorporating reinforcments oriented in one or more directions; - optionally, a sheet of elastomeric material (105g) arranged between said at least a first belt layer (105a) and said second belt layer (105b) - a third belt layer (105c), radially outerside of the second belt layer (105b) and incorporating inclined reinforcing elements; and - a fourth belt layer (105d), radially outerside of the third belt layer (105c) and incorporating inclined reinforcing elements at an opposite direction with respect to that of the third belt layer (105c).