Pneumatic Tire Tread Block Pattern for Ice Grip and Drainage
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Solution Overview
Problem
Conventional pneumatic tires with block patterns suffer from block collapse during ground contact, leading to inadequate ground contact area, braking, traction, and cornering performance on icy roads, and enhancing on-ice performance compromises drainage performance.
Innovation Solution
A pneumatic tire design featuring a tread with circumferential main grooves, narrow grooves, and auxiliary grooves that increase in width outward, ensuring a block area of 100 mm2 to 200 mm2, and a grid pattern with inclined grooves to enhance drainage and rigidity, while maintaining ground contact area and improving on-ice performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If block size is increased to improve rigidity and ground contact performance, then on-ice performance improves, but drainage performance becomes insufficient
Solution Approach 1:
The tread is divided into multiple blocks of specific area (100-200 mm²) with various groove patterns (circumferential main grooves, narrow grooves, auxiliary grooves) to achieve both rigidity and drainage. The segmentation creates optimal balance between contact area and water evacuation pathways.
Solution Approach 2:
Different groove widths and patterns are applied to different regions of the tread. The auxiliary grooves have varying widths (narrower near circumferential main groove, wider toward outer edge) to optimize both structural support and drainage in different zones.
2Object-generated harmful factors
If block size is decreased to improve drainage performance, then drainage performance improves, but ground contact area is reduced and on-ice performance worsens
Solution Approach 1:
The tread pattern is segmented into blocks with specifically controlled areas (100-200 mm²) that maintain sufficient ground contact while incorporating multiple groove systems for effective drainage, resolving the trade-off between contact area and drainage capability.
Solution Approach 2:
Drainage is achieved not only through block size reduction but by adding multiple groove dimensions (circumferential main grooves, narrow grooves, auxiliary grooves) that provide drainage pathways without significantly reducing ground contact area.
3Object-generated harmful factors
If conventional block pattern is used with multiple sipes, then edge effect on icy roads improves, but blocks collapse during ground contact
Solution Approach 1:
Sipes are selectively placed and configured in specific blocks rather than uniformly across all blocks. The groove patterns vary by region to provide edge effect where needed while maintaining block stability in load-bearing areas.
Solution Approach 2:
The block structure combines multiple groove types (circumferential main grooves, narrow grooves, auxiliary grooves) with controlled block areas to create a composite tread pattern that provides both edge effect and structural stability.
Data Source
AI summary
By adopting an appropriate block pattern, a pneumatic tire guarantees the tire ground contact area without impairing drainage performance and enhances on-ice performance. On the tread are formed land portions (5a, 5b) defined by at least one circumferential main groove (3) extending in the tire circumferential direction and blocks (11) in a shoulder land portion (5b) located outermost in the tire width direction among the land portions (5a, 5b), the blocks (11) being defined by narrow grooves (7a, 7b) with a groove width narrower than that of the circumferential main groove (3) and by at least one auxiliary groove (9) with a groove width that increases outward in the tire width direction at least in a region not adjacent to the circumferential main groove. The area of the tread surface of each of the blocks (11) is in a range of 100 mm2 to 200 mm2.