Pneumatic Tire Asymmetric Side Block Segmentation
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Solution Overview
Problem
Existing pneumatic tires designed for unpaved roads face challenges in achieving a balance between noise performance and running performance, with large groove area tires excelling in traction but degrading in noise, and small groove area tires performing poorly on unpaved surfaces.
Innovation Solution
A pneumatic tire design featuring a tread portion with a segmented structure, including side blocks in both inner and outer regions, where the number and size of side blocks are strategically varied to enhance noise reduction and cut resistance, ensuring balanced performance on unpaved roads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large groove area is adopted to improve running performance on unpaved roads, then traction performance is improved, but noise performance degrades
Solution Approach 1:
The patent applies local quality by differentiating the groove structure between the inner side region and outer side region of the tread. The outer side region has a first groove structure optimized for noise reduction, while the inner side region has a second groove structure optimized for traction on unpaved roads. This localized differentiation allows each region to perform its specific function optimally without compromising the other.
2Object-affected harmful factors
If a small groove area is adopted to improve noise performance, then wind noise is reduced, but running performance on unpaved roads deteriorates
Solution Approach 1:
The patent segments the groove structure into distinct regions: the outer side region with first grooves extending in the tire width direction, and the inner side region with second grooves extending in the tire circumferential direction. This segmentation allows the tire to have different groove characteristics in different areas, enabling simultaneous optimization for noise reduction and unpaved road performance.
3Strength
If side blocks with large individual blocks are provided to improve cut resistance, then running performance on unpaved roads is improved, but noise performance degrades
Solution Approach 1:
The patent applies local quality by providing different block structures in different regions. The inner side region has larger side blocks that provide cut resistance and traction on unpaved roads, while the outer side region has smaller side blocks that reduce wind noise. This localized differentiation resolves the contradiction between cut resistance and noise performance.
4Object-affected harmful factors
If side blocks with small individual blocks are provided to improve noise performance, then wind noise is reduced, but cut resistance deteriorates
Solution Approach 1:
The patent segments the side block structure into two regions: the outer side region with smaller side blocks for noise reduction, and the inner side region with larger side blocks for cut resistance. This segmentation allows the tire to achieve both noise reduction and adequate cut resistance by assigning different block sizes to appropriate regions.
Data Source
AI summary
To provide a pneumatic tire that provides improved noise performance and running performance on unpaved roads. A plurality of side blocks rising from an outer surface of a sidewall portion and defined by a segmentation element are provided in each of side regions adjacent to an outer side in a tire width direction of an outermost end portion in the tire width direction of a tread portion. The number Nin of the side blocks provided in an inner side region that is an inner side with respect to a vehicle when a tire is mounted on the vehicle is smaller than the number Nout of the side blocks provided in an outer side region that is an outer side with respect to the vehicle when the tire is mounted on the vehicle.