Tire Tread Sipe Configuration for Steering Stability and Snow Grip
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Solution Overview
Problem
Conventional tires with circumferentially extending main grooves and sipes improve snow performance but compromise steering stability on dry road surfaces due to reduced tread rigidity.
Innovation Solution
A tire design featuring circumferentially and continuously extending shoulder main grooves, crown main grooves, and strategically placed longitudinal and middle sipes, with varying depths and orientations to enhance both steering stability and snow performance by maintaining tread rigidity and generating sufficient friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If circumferential grooves and sipes are added to improve snow performance, then snow performance is improved, but tread rigidity is reduced and steering stability on dry road surfaces deteriorates
Solution Approach 1:
The tread is segmented into multiple functional zones: shoulder portions with circumferential grooves for snow performance, crown portions with longitudinal grooves for steering stability, and middle portions with specifically designed sipes. This segmentation allows each zone to optimize for its specific function without compromising overall tread rigidity.
Solution Approach 2:
Different regions of the tread are given different structural qualities: the shoulder portions have deeper grooves and more sipes for snow traction, while the crown portions have fewer, shallower grooves to maintain rigidity for steering stability. The middle portions use asymmetric sipe configurations (more outer middle sipes than inner middle sipes) to balance both requirements.
2Force
If more sipes and grooves are introduced to enhance snow performance, then friction on snow is increased, but the structural integrity and rigidity of the tread are compromised
Solution Approach 1:
The sipes are designed with varying depths and orientations to dynamically adapt to different operating conditions. The inner middle sipes and outer middle sipes have different configurations that allow the tread to maintain rigidity during steering while providing sufficient flexibility and friction during snow contact.
Solution Approach 2:
The patent varies multiple parameters of the sipes and grooves including depth, width, orientation, and spacing. The outer middle sipes have different characteristics than the inner middle sipes, and both differ from the longitudinal grooves. These parameter variations enable the tread to achieve both high friction on snow and maintain structural integrity.
Data Source
AI summary
A tire includes a tread portion being provided with a pair of circumferentially and continuously extending shoulder main grooves and at least one crown main groove between the shoulder main grooves to form a pair of middle portions each of which is between adjacent one crown main groove and one shoulder main groove. Each of the middle portions is provided with a circumferentially and continuously extending longitudinal sipe, a plurality of inner middle sipes extending axially outwardly from the crown main groove and terminating without reaching the longitudinal sipe and a plurality of outer middle sipe extending axially inwardly from the shoulder main groove and terminating without reaching the longitudinal sipe. The number of the outer middle sipes is greater than the number of the inner middle sipes.