Pneumatic Tire Tread Segmentation for Steering Stability
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Solution Overview
Problem
Conventional pneumatic tires with wide main grooves for improved drainage performance compromise tread rigidity, leading to reduced steering stability on both dry and wet roads.
Innovation Solution
A pneumatic tire design featuring circumferentially extending main grooves with specific width and depth ratios, combined with narrow crown sipes and chamfered portions, to enhance drainage and maintain rigidity for improved steering stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three wide main grooves are provided in the tread portion to improve drainage performance, then drainage performance is improved, but tread rigidity is reduced, leading to deteriorated steering stability on dry road and wet road
Solution Approach 1:
The tread portion is segmented into multiple functional zones with different groove configurations. The first and second crown portions have different sipe patterns, and the shoulder portions have different groove arrangements. This segmentation allows each zone to contribute differently to overall performance, maintaining rigidity in critical areas while providing drainage where needed.
Solution Approach 2:
Different regions of the tread are given different local characteristics. The first crown portion has first crown sipes with specific width and inclination, while the second crown portion has second crown sipes with different characteristics. The shoulder portions have main grooves with specific width ratios. This local differentiation optimizes both rigidity and drainage in specific areas without compromising overall tread stability.
2Reliability
If the total width of main grooves is increased to improve drainage, then drainage performance is improved, but steering stability deteriorates due to reduced tread rigidity
Solution Approach 1:
The invention optimizes specific parameters of the groove system. The total width of main grooves is controlled at 25-35% of tread width. The width of first shoulder main groove is set at 60-80% of second shoulder main groove width. Crown sipes have widths of 0.3-1.5mm with specific inclination angles of 15-30 degrees. These parameter optimizations balance drainage capability with tread rigidity maintenance.
Data Source
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AI summary
A pneumatic tire includes a tread portion (1) provided with a first shoulder main groove (3), a second shoulder main groove (4) and at least one main groove (5) to separate a first crown portion (8) and a second crown portion (9); the first crown portion (8) is provided with first crown sipes (10) with a width less than 2 mm, but is not provided with any grooves with a width equal to or more than 2 mm; the second crown portion (9) is provided with second crown sipes (11) having a width less than 2 mm, but is not provided with any grooves with a width equal to or more than 2 mm; each first crown sipe (10) extends from the crown main groove (5) to the first shoulder main groove (3) with a first inclination direction; each second crown sipe (11) extends from the crown main groove (5) to the second shoulder main groove (4) with the same first inclination direction.