Hexagonal Tire Blocks with Shifted Sipes for Traction and Wear
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Solution Overview
Problem
Pneumatic tires with block patterns face a trade-off between traction performance and uneven wear resistance due to the degradation of block rigidity caused by sipes in circumferential grooves, where sipes enhance traction but reduce rigidity, and terminating sipes in blocks decreases traction effects.
Innovation Solution
A pneumatic tire design featuring three zigzag-shaped circumferential grooves, first and second transverse grooves forming hexagonal blocks with a sipe terminated within the block, positioned shifted from the diagonal extension line and between transverse groove wall surfaces, to maintain block rigidity while improving traction and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sipes are opened in the circumferential grooves to enhance traction performance, then traction performance is improved, but block rigidity is degraded causing uneven wear
Solution Approach 1:
The sipe configuration is optimized locally within each block by positioning it at a shifted position from the diagonal extension line and within specific regions bounded by transverse groove wall surfaces. This local optimization allows the sipe to provide traction enhancement while minimizing its impact on overall block rigidity, thereby reducing uneven wear.
Solution Approach 2:
The sipe is configured to extend partially through the block thickness rather than completely opening into the circumferential groove. This partial action provides sufficient traction benefit while maintaining adequate block rigidity to prevent excessive collapse and uneven wear.
2Strength
If sipes are terminated in the block to reduce degradation of block rigidity, then block rigidity is maintained, but traction effects achieved by the sipes decrease
Solution Approach 1:
The sipe geometry parameters are optimized by controlling its position (shifted from diagonal extension line), orientation (extending in tire-width direction), and boundaries (within regions interposed between transverse groove wall surfaces). These parameter changes enable the sipe to achieve effective traction enhancement while maintaining block rigidity.
3Reliability
If blocks are provided with sipes to improve wet road traction, then traction performance is enhanced, but uneven wear resistance decreases due to block collapse
Solution Approach 1:
The sipe is positioned locally within specific regions of the block (interposed between planes formed by extending transverse groove wall surfaces) rather than uniformly distributed. This localized configuration provides traction enhancement at critical areas while preserving overall block structural integrity for uniform wear characteristics.
Solution Approach 2:
The sipe configuration uses partial penetration into the circumferential groove space (terminated within block or partially opened) rather than full opening. This partial action provides sufficient wet traction improvement while maintaining adequate block rigidity to prevent excessive collapse and ensure uniform wear over time.
Data Source
AI summary
A pneumatic tire includes a tread portion that is provided with two block rows formed of three circumferential grooves and a plurality of first transverse grooves. A block that configures the block rows has a hexagonal shape, and has a diagonal extension line passing through a pair of vertices positioned in the central portion in the tire-circumferential direction, the diagonal extension line overlapping, in the tire-circumferential direction, the first transverse groove of the adjacent block rows. The block has a first sipe that is terminated within a block extending in the tire-width direction. The first sipe is provided at a position shifted from the diagonal extension line in the tire-circumferential direction and in a region interposed between planes that are formed by extending, in a direction in which the first transverse groove extends, from a pair of groove wall surfaces of the first transverse groove of the adjacent block rows.