Alternating Crown Block Tire Tread for Sideslip and Wear Resistance
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Solution Overview
Problem
Existing tires face challenges in reducing sideslip while maintaining wear resistance, particularly in off-road conditions.
Innovation Solution
The tire design features a tread portion with a pair of shoulder block rows and a plurality of crown blocks, including first and second crown blocks with specific tread surface elongations and orientations, which alternate in the tire circumferential direction to enhance stiffness and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If middle blocks with length in tire circumferential direction greater than length in tire axial direction are used, then wear resistance is enhanced, but sideslip reduction is insufficient
Solution Approach 1:
The crown region is segmented into two types of crown blocks: first crown blocks with laterally elongated tread surfaces (maximum length in tire circumferential direction is less than maximum width in tire axial direction) and second crown blocks with longitudinally elongated tread surfaces (maximum length in tire circumferential direction is greater than maximum width in tire axial direction). This segmentation allows different block configurations to address different performance requirements simultaneously.
Solution Approach 2:
Different regions of the tread are assigned different block characteristics: first crown blocks with lateral elongation are positioned to reduce sideslip, while second crown blocks with longitudinal elongation are positioned to enhance wear resistance. Each local region optimizes for its specific function through tailored block geometry.
2Duration of action of stationary object
If blocks with high stiffness in tire circumferential direction are used, then wear resistance is enhanced, but sideslip is increased
Solution Approach 1:
The tread pattern employs asymmetric block orientations: first crown blocks have tread surfaces where the maximum dimension is in the tire axial direction (laterally elongated), while second crown blocks have tread surfaces where the maximum dimension is in the tire circumferential direction (longitudinally elongated). This asymmetry in block orientation creates complementary stiffness characteristics that simultaneously reduce sideslip and enhance wear resistance.
Solution Approach 2:
The alternating arrangement of first and second crown blocks creates a dynamic stiffness distribution across the tread. The first crown blocks provide stiffness in the tire axial direction to resist sideslip, while the second crown blocks provide stiffness in the tire circumferential direction to resist wear, creating a balanced dynamic response to different operational stresses.
Data Source
AI summary
A tire 1 includes a pair of shoulder block rows 4, 4 and a plurality of crown blocks 5. The crown blocks 5 include a plurality of first crown blocks 7 and a plurality of second crown blocks 8 which are disposed such that a second crown block pair 9 having the two second crown blocks 8 disposed adjacent to each other in the tire axial direction repeatedly appears in the tire circumferential direction. Each first crown block 7 is disposed one by one between the second crown block pairs 9 adjacent to each other in the tire circumferential direction. The first crown block 7 has a laterally elongated tread surface 7a in which the maximum length L1 is less than the maximum width W1. The second crown block 8 has a longitudinally elongated tread surface 8a in which the maximum length L2 is greater than the maximum width W2.