Pneumatic Tyre Tread with Asymmetric Diagonal Grooves
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Solution Overview
Problem
Existing pneumatic vehicle tire tread profiles with arrowed grooves suffer from noise issues due to uneven profile positives and water drainage inefficiencies, particularly under winter driving conditions, as a result of mirror-symmetrical groove arrangements and varying groove lengths across the tread.
Innovation Solution
The tire tread profile features diagonal grooves positioned symmetrically with respect to the tire equator, with equal widths and angles, and varying lengths to maintain even profile stiffness, combined with increasing groove widths from the center to the edges, and transverse grooves inclined to enhance water drainage and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If diagonal grooves are offset in the circumferential direction to improve aquaplaning behavior, then water drainage capability is improved, but profile positives become uneven causing noise and wear problems
Solution Approach 1:
The patent applies asymmetry by offsetting the diagonal grooves in the circumferential direction relative to the tire equator. This asymmetric arrangement creates an arrow-like pattern that directs water flow more effectively toward the center, improving aquaplaning resistance while maintaining uniform profile positives through careful design of the groove positions and dimensions.
2Productivity
If diagonal grooves extend beyond the tire equator into the other half of the tread, then aquaplaning behavior is improved, but profile positive height differences occur causing belt bandage rippling
Solution Approach 1:
The patent applies local quality by varying the groove dimensions and positions in different regions of the tread. The diagonal grooves are designed with specific widths and angles that change locally to maintain uniform profile positive heights while still achieving effective water drainage and improved aquaplaning behavior in the critical equatorial region.
3Productivity
If mirror-symmetrical groove arrangement is used, then water drainage is improved, but rolling noise increases due to simultaneous running in of grooves
Solution Approach 1:
The patent breaks the mirror-symmetry by introducing a circumferential offset of the diagonal grooves relative to the tire equator. This asymmetric, arrow-like arrangement maintains effective water drainage pathways while creating a more favorable noise profile by avoiding the simultaneous running-in of grooves that occurs with mirror-symmetrical designs.
Data Source
Figure 1
Figure 2
AI summary
The tire has a profile block (7a) and profile positive (7b) formed by diagonal grooves (5), which are displaced in one of running strip halves against other running strip halves in a circumferential direction. A shoulder block comprises shoulder block series (2) with an adjacent transverse groove (4) and the diagonal grooves and forms pitches, which are provided in two different circumferential lengths. The diagonal grooves run along a pitch limit such that the diagonal grooves associated to the pitches exhibit coincidence width and run under same large angle to a tire equator (A-A).