Pneumatic Tire Lug Grooves Notch Width Optimization
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Solution Overview
Problem
Existing pneumatic tires face challenges in reducing pattern noise and maintaining wet performance, as designs that suppress air column resonance often compromise drainage performance and increase noise emission.
Innovation Solution
The pneumatic tire features main grooves and lug grooves with varying widths and notch portions that gradually increase in width towards the main grooves, optimizing groove dimensions to reduce noise emission and enhance drainage, while ensuring wet performance by adjusting notch widths and depths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the constriction groove portion communicates with the circumferential groove to reduce air column resonance, then pattern noise is reduced, but drainage performance deteriorates and wet performance worsens
Solution Approach 1:
The patent applies local quality by creating a notch portion only at specific locations (opening edges of lug grooves) rather than uniformly modifying the entire groove structure. This localized modification allows drainage enhancement at critical water ejection points while maintaining the noise-reducing communication between constriction groove portions and circumferential grooves. The notch portions are strategically positioned to intercept water flow and redirect it toward main grooves without compromising the Helmholtz resonator functionality for noise reduction.
2Object-generated harmful factors
If the groove width is reduced to suppress noise emission, then pattern noise decreases, but drainage performance deteriorates
Solution Approach 1:
The patent applies dynamics by making the groove width variable rather than constant. The groove width gradually increases from the constriction groove portion toward the notch portion, creating a dynamic transition in cross-sectional area. This gradual expansion allows the groove to maintain narrow dimensions (suppressing noise) for most of its length while expanding at the drainage-critical notch region to facilitate water ejection. The dynamic width variation resolves the contradiction between noise suppression and drainage performance.
3Reliability
If the lug groove width is increased to improve drainage, then wet performance improves, but noise emission increases
Solution Approach 1:
The patent applies segmentation by dividing the lug groove structure into distinct functional zones: a narrow constriction groove portion for noise suppression, a gradual expansion zone for transition, and a wider notch portion for drainage. This segmentation allows each zone to optimize for its specific function - the constriction portion minimizes noise by maintaining narrow dimensions, while the notch portion maximizes drainage without significantly impacting overall noise emission. The segmented structure resolves the contradiction by localizing the wide opening only where drainage is critical.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively reduces pattern noise and maintains wet performance by balancing noise suppression and drainage enhancement, with specific relationships between groove and notch dimensions ensuring improved wear resistance and braking performance on wet surfaces.
Implementation Method 1
a Helmholtz type resonator including the air chamber portion and the constriction groove portion is provided to reduce air column resonance
Implementation Method 2
the notch portion has a notch width that increases from a position of the maximum groove width of the lug grooves to the main grooves. This allows the drainage performance in the lug groove to be increased
Data Source
AI summary
A pneumatic tire includes lug grooves arranged in a circumferential direction in a tread surface of a land portion defined by two main grooves adjacent in a lateral direction, the lug grooves each crossing the circumferential direction and communicating at both ends with the main grooves, defining the land portion in the circumferential direction. A notch portion is formed on an opening edge of the lug grooves. The notch portion is cutout from the tread surface inward in a radial direction. The lug grooves have a maximum groove width at a position from 30% to 70% of a lateral direction dimension of the land portion from one of the main grooves and a groove width that decreases from the maximum groove width to the main grooves. The notch portion has a notch width that increases from a position of the maximum groove width of the lug grooves to the main grooves.