Tire Belt Layer Layout for Steering Stability and Durability
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Solution Overview
Problem
Tires with a belt layer, while achieving noise and fuel efficiency, face challenges in enhancing steering stability and durability to meet modern vehicle performance standards and infrastructure demands.
Innovation Solution
A tire design incorporating a belt layer with densely arranged non-twisted single steel wire belt cords and a band layer, optimized in terms of cord density, thickness, and arrangement to improve rigidity and reaction force generation, thereby enhancing steering stability and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a belt layer with conventional cord arrangement is used, then noise performance and low fuel consumption are achieved, but steering stability and durability are insufficient
Solution Approach 1:
The belt layer is divided into multiple belt plies (first belt ply and second belt ply) with different cord arrangements. Each ply is further segmented into regions with different cord orientations (diagonal cords at 30-45 degrees in one region, circumferential cords in another region). This segmentation allows each segment to perform specific functions for optimizing both steering stability and durability without excessive overall complexity.
Solution Approach 2:
Different regions of the belt layer are assigned different cord arrangements based on local performance requirements. The diagonal cord region provides enhanced steering stability and shoulder durability, while the circumferential cord region optimizes for low fuel consumption and noise performance. This local quality differentiation resolves the contradiction by addressing specific performance needs in specific areas rather than uniform design.
2Reliability
If belt cords are densely arranged to improve rigidity, then steering stability improves, but heat generation increases
Solution Approach 1:
The invention optimizes the density and arrangement parameters of belt cords to achieve the desired balance. By specifying precise cord angles (30-45 degrees for diagonal cords) and regional distribution patterns, the design achieves improved steering stability through optimized rigidity while controlling heat generation through appropriate cord spacing and orientation that reduces friction and stress concentration.
Data Source
Figure 1
Figure 2
AI summary
Provided is a tire having improved steering stability and durability. The tire 1 includes a belt layer 7 disposed inward of a tread portion 2 in a tire radial direction a. The belt layer 7 includes a first belt ply 7A. The first belt ply 7A includes belt cords 7a each formed of a single steel wire. A number N1 of belt cords 7a that are arranged per ply width of 5 cm in the first belt ply 7A is 102 to 187, in a cross section orthogonal to a longitudinal direction of the belt cords 7a.