Pneumatic Tire Tread Rubber Distribution for Ride Comfort
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Solution Overview
Problem
Heavy-duty tires with low aspect ratios and circumferential reinforcing layers in the belt layer face reduced ride comfort due to increased tread rigidity, leading to deformation and reduced envelopment when in contact with the ground.
Innovation Solution
A pneumatic tire design featuring a carcass layer, a belt layer with cross belts and a circumferential reinforcing layer, where the belt layer is formed by layering cross belts with varying angles and a circumferential reinforcing layer with a specific angle range, ensuring a high Gsh/Gcc ratio for a flat tread shape and adequate tread rubber volume, and a Gs/Ge ratio for appropriate shoulder rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a circumferential reinforcing layer is disposed in the belt layer with a low aspect ratio, then the tread shape is maintained, but the ride comfort performance deteriorates due to increased tread rigidity
Solution Approach 1:
The patent applies local quality by creating asymmetric tread rubber distribution where the shoulder portion has greater rubber volume (Gsh/Gcc ≥ 1.10) compared to the center portion. This local variation in rubber thickness allows the shoulder area to deform more easily for ride comfort while the center maintains structural integrity for tread shape stability.
Solution Approach 2:
The patent changes the geometric parameters of the tread rubber distribution by defining specific ratio relationships (Gsh/Gcc ≥ 1.10 and Gs/Ge ≥ 1.00) that control the volume and position of tread rubber at different locations. These parameter adjustments enable the tire to achieve both shape maintenance and improved ride comfort.
2Reliability
If the tread rubber volume at the shoulder portion is increased to improve envelopment, then the deformation level is reduced, but the device complexity increases due to precise geometric constraints
Solution Approach 1:
The patent simplifies the design complexity by establishing clear parameter thresholds (Gsh/Gcc ≥ 1.10 and Gs/Ge ≥ 1.00) that define the required tread rubber distribution. These quantitative parameters provide straightforward design guidelines for achieving proper envelopment without requiring complex geometric calculations or multiple iterative designs.
Data Source
AI summary
A pneumatic tire is provided with a carcass layer, a belt layer disposed on the outer side of the carcass layer in a radial direction of the tire, and tread rubber disposed on the outer side of the belt layer in the radial direction of the tire. The belt layer is formed by layering a pair of cross belts having belt angles with absolute values from 10° to 45° inclusive and opposite signs, and a circumferential reinforcing layer having a belt angle within a range of ±5° with respect to the circumferential direction of the tire. A distance (Gcc) from a tread profile to an inner circumferential surface of the tire along a tire equatorial plane and a distance (Gsh) from a tread end (p) to the inner circumferential surface of the tire have a relationship such that 1.10≤Gsh/Gcc.