Heavy Vehicle Tire Bead Radius of Curvature Design
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Solution Overview
Problem
Tires for heavy vehicles, particularly those used in underground mining, experience significant and uneven wear at the bead region due to high torque transmission and limited space, leading to reduced tire life and variable wear rates.
Innovation Solution
A tire design with a radial carcass reinforcement and hexagonal bead wires having a greater axial width to radial height ratio, a rounded bead profile with increased radius of curvature for easier mounting, and a specific taper angle to distribute pressure evenly, reducing the risk of deformation and improving bead seating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the tire uses conventional bead wire design with standard radius of curvature, then the tire structure is simple and manufacturing is easier, but the bead region experiences significant wear and uneven wear patterns reducing tire life
Solution Approach 1:
The patent changes the geometric parameters of the bead wire by increasing its radius of curvature to a specific range (R1 ≥ 15mm for radial tires, R1 ≥ 20mm for diagonal tires). This parameter modification reduces stress concentrations in the bead region during mounting and operation, thereby decreasing wear and extending tire life without fundamentally changing the bead structure design approach.
2Volume of moving object
If the tire uses smaller dimensions to fit limited space in underground mines, then the vehicle form is more compact, but the tire is not ideally suited to transmit the required torques
Solution Approach 1:
The patent applies local quality enhancement by concentrating structural reinforcement specifically in the bead region through the increased radius of curvature design. This localized structural optimization allows the tire to maintain overall compact dimensions while achieving sufficient torque transmission capability through enhanced local strength and stress distribution at the critical bead-mating surface.
3Reliability
If the tire uses conventional mounting design without specific radius of curvature requirements, then the manufacturing process is simpler, but the bead region experiences deformation and uneven wear during mounting and operation
Solution Approach 1:
The patent specifies precise geometric parameters for the bead wire radius of curvature (R1 ≥ 15mm for radial tires, R1 ≥ 20mm for diagonal tires) to ensure proper stress distribution during mounting and operation. This parameter control improves wear resistance and wear uniformity by preventing bead deformation, while the precision requirements remain within achievable manufacturing capabilities for steel bead wires.
Data Source
AI summary
A tire for a heavy vehicle with a radial carcass reinforcement anchored in two beads by wrapping around bead wires. In a radial plane, radially on the inside of the radially innermost point of the at least one layer of carcass reinforcement and axially on the outside of the geometric center of the bead wire, the radius of curvature at a point on the exterior surface of the bead is greater than the radius of curvature at the point of orthogonal projection of the point of the exterior surface of the bead onto the at least one layer of carcass reinforcement.