Tire Sipe Interval Optimization for Ice Braking and Dry Wear
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Solution Overview
Problem
Conventional studless tires face challenges in balancing performance on ice and snow roads with dry roads, as increasing sipe density improves ice performance but deteriorates dry road wear resistance and block rigidity, leading to reduced traction and shortened tire life.
Innovation Solution
The tire design features a specific configuration with varying sipe intervals and pitch lengths to enhance block rigidity and ground contact area, increasing the edge effect and wear resistance by optimizing the relationship between sipe intervals and pitch lengths, particularly using foamed rubber for improved flexibility and friction on ice surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of sipes formed in the land portion block is increased, then the edge component that scratches the road surface is increased and braking performance on ice road is improved, but the block rigidity is deteriorated and wear resistant performance on dry road surface is largely deteriorated
Solution Approach 1:
The patent applies local quality by differentiating sipe intervals between center portion blocks and shoulder land portion blocks. Center portion blocks have smaller sipe intervals to maximize edge effect for braking, while shoulder blocks have larger sipe intervals to maintain block rigidity and wear resistance. This localized differentiation resolves the contradiction between improving ice braking performance and maintaining dry road wear resistance.
2Reliability
If the number of sipes formed in the land portion block is increased, then the on-ice performance is improved, but the tire lifetime is shortened due to increased wear
Solution Approach 1:
The patent implements local quality by setting different sipe intervals for different tire regions. The center portion blocks (where braking force is primarily applied) have smaller sipe intervals for superior ice braking, while shoulder land portion blocks (which bear more wear during acceleration and cornering) have larger sipe intervals to maintain structural integrity and extend tire life. This spatial differentiation simultaneously optimizes both on-ice performance and tire lifetime.
3Strength
If the pitch length defined by a repeating unit of the tread pattern is made long, then the block rigidity is increased and ground contact area is increased, but the sipe density in the land portion block reaches its limit and block rigidity deteriorates when the land portion block is finely divided by sipes
Solution Approach 1:
The patent resolves this contradiction by applying local quality through differentiated sipe intervals. In center portion blocks where edge effect is critical for braking, smaller sipe intervals are used despite the long pitch length. In shoulder land portion blocks, larger sipe intervals are used to maintain block rigidity. This localized approach allows the long pitch length to provide overall structural stability while local regions maintain sufficient sipe density for edge effect.
Data Source
AI summary
In a pneumatic tire 10 according to the present invention, as an average sipe interval hc defined by an average interval of sipes adjacent to each other in a tire circumferential direction in a center portion block, which is a block arranged at a position including a tire equatorial line, and an average sipe interval hs is defined in a shoulder portion block, which is a block located at an ground contact end in a tire width direction, a relation of 1.05≤(hs/hc)≤4.00 is fulfilled.