Tire Carcass Cord Angle Layout for Shoulder Wear Reduction
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Solution Overview
Problem
Existing tire designs suffer from uneven wear in the shoulder region due to tire internal structure strain, particularly caused by carcass and belt cord deformations during manufacturing and inflation, which propagates to the tread.
Innovation Solution
The tire design includes a carcass layer with improved inclination angles of the outermost carcass layer and specific belt layers, where the inclination angles of the carcass cord relative to the tire width direction are optimized to reduce strain propagation to the tread, using a tire X-ray device to determine these angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inclination angle of the second and third belt plies is optimized, then wear resistance performance is improved, but tire internal structure strain from carcass cord deformation is not adequately addressed
Solution Approach 1:
The patent optimizes the inclination angle parameter of the outermost carcass layer cord to be -3° or more relative to the tire width direction, which directly addresses the carcass cord deformation issue while maintaining wear resistance performance
Solution Approach 2:
The patent specifically targets the outermost carcass layer adjacent to the belt layer for angle optimization, applying a localized quality improvement to the specific region where strain propagation to the tread occurs most significantly
Data Source
AI summary
In a tire, an inclination angle of a cord included in a second belt layer with respect to a tire width direction is defined as a positive inclination angle in a tire see-through plan view, an intersection point between a perpendicular line drawn from an end portion of a belt layer having a maximum belt width in the tire width direction to a carcass and a cord of an outermost carcass layer in a tire radial direction is defined as a first reference point in a tire meridian cross-sectional view, and an inclination angle of the cord with respect to the tire width direction at the first reference point is −3° or more in the tire see-through plan view.