Pneumatic Tire Tie Bar Dimples for Wear Resistance
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Solution Overview
Problem
Pneumatic tires with tie bars connecting notches in the tread portion experience uneven wear due to excessive rigidity, which current designs fail to adequately address, leading to reduced wear resistance.
Innovation Solution
Incorporating dimples in the notch internal regions of tie bars, arranged away from the concave side wall surfaces, to balance rigidity and reduce wear, along with strategically placing notches and tie bars to equalize tread surface rigidity across the tire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If tie bars connect between paired notches in land portions, then traction is improved, but rigidity of notch portions becomes too high causing uneven wear
Solution Approach 1:
The patent applies local quality by creating dimples at specific locations (notch internal regions) of the tie bars rather than uniformly modifying the entire structure. This localized modification reduces rigidity only where needed (at the notch portions) while preserving the structural integrity and traction-enhancing properties of the tie bars in other regions. The dimples create local flexibility zones that balance the overall rigidity distribution.
Solution Approach 2:
The tie bar structure is segmented by introducing dimples that divide the continuous tie bar into regions of different rigidity. The dimples create distinct segments along the tie bar length, allowing the notch internal regions to have reduced rigidity while other portions maintain higher rigidity for structural support. This segmentation enables differential rigidity control to prevent uneven wear.
2Reliability
If notches are formed in land portions for traction improvement, then edge energy difference is reduced, but excessive rigidity in notch portions causes uneven wear
Solution Approach 1:
The dimples are strategically positioned in the notch internal regions of the tie bars, creating local quality variations. This localized rigidity reduction at the notch portions (where wear occurs) while maintaining rigidity in other tie bar regions addresses the uneven wear problem without compromising the overall structural strength and wear resistance of the tread portion.
3Reliability
If dimples are arranged in notch internal regions of tie bars, then rigidity is balanced and wear resistance is improved, but structural complexity increases
Solution Approach 1:
The dimple configuration applies local quality by modifying only specific regions (notch internal regions) of the tie bars rather than the entire structure. This targeted approach improves wear resistance through localized rigidity adjustment while minimizing the overall structural complexity. The dimples are simple geometric features that can be integrated into existing mold designs without fundamentally redesigning the entire tire tread structure.
Data Source
AI summary
The pneumatic tire has main grooves; land portions which are sectioned by the main grooves; paired notches which face to each other as well as being open to a tread surface; the notches being concave portions which are formed in side surfaces of two land portions which are adjacent across the main grooves; tie bars which protrudes at a predetermined height from groove bottoms of the main grooves and connect between the paired notches; and dimples which are provided in the middle in a width direction of the tie bars. The dimples are arranged at least in a notch internal region which is surrounded by wall surfaces of the notches among the tie bars.