Pneumatic Tire Tread Grooves for Off-Road Traction and Lower Noise
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Solution Overview
Problem
Pneumatic tires designed for unpaved roads face challenges in balancing traction performance with noise reduction, as tires with large groove areas for traction tend to have inferior noise performance, and those optimized for paved roads lack traction on unpaved surfaces.
Innovation Solution
A pneumatic tire design featuring a tread with complexly bent main grooves and varied block arrangements, including shoulder and center blocks, with specific groove shapes and orientations to enhance edge effect and reduce noise transmission, while maintaining traction on unpaved roads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large groove area is used to improve traction on unpaved roads, then driving performance on unpaved roads is improved, but noise performance deteriorates
Solution Approach 1:
The main grooves are designed with complex curved patterns including zigzag shapes and inclined portions rather than straight lines. This curvature disrupts the regularity of the tread pattern, reducing pattern noise generation while maintaining the groove area necessary for traction on unpaved roads.
Solution Approach 2:
The tread pattern incorporates asymmetric groove configurations with varying widths, depths, and orientations. The main grooves have different characteristics on different sides of the tire, creating irregular noise patterns that cancel each other out while preserving effective traction surfaces for off-road performance.
2Productivity
If blocks with large edge components are used to enhance traction on unpaved roads, then driving performance on unpaved roads is improved, but noise performance deteriorates
Solution Approach 1:
The tread blocks are segmented into multiple smaller sub-blocks and edge components rather than large monolithic blocks. This segmentation creates numerous small biting edges for improved traction while the scattered arrangement reduces the coherence of noise patterns, lowering overall noise levels.
Solution Approach 2:
Different regions of the tread pattern have locally optimized characteristics - shoulder blocks have specific edge configurations for lateral traction, while center blocks have different patterns for longitudinal grip. This local differentiation allows each region to contribute to traction while the overall irregular pattern suppresses noise.
3Object-generated harmful factors
If a tread pattern optimized for paved roads is used, then noise performance is improved, but driving performance on unpaved roads deteriorates
Solution Approach 1:
The tread pattern is designed with multi-functional characteristics that enable it to perform effectively on both paved and unpaved surfaces. The combination of main grooves, sipes, and varied block configurations provides noise reduction suitable for paved roads while maintaining sufficient edge components and groove volume for traction on unpaved roads.
Solution Approach 2:
The tread pattern incorporates flexible elements such as sipes and variable groove widths that can adapt their effective configuration based on road conditions. On paved surfaces, the pattern naturally favors noise reduction, while on unpaved surfaces, the same elements provide enhanced traction through increased edge engagement.
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
The tire achieves improved driving performance on unpaved roads by optimizing groove shape and block arrangement, reducing pattern noise and air column resonance, thus enhancing both traction and noise performance.
Implementation Method 1
since the main groove is bent in a complex manner, air column resonance can be suppressed, noise transmission can be suppressed, and noise performance can be enhanced
Data Source
AI summary
A pair of main grooves disposed on both sides of a tire equator of a pneumatic tire and extending along a tire circumferential direction is configured so that a series of bent elements formed by connecting at least five linear groove portions via bend points are continuously and repeatedly arranged in the tire circumferential direction, and the at least five linear groove portions included in each of the bent elements have three or more types of inclination angles with respect to the tire circumferential direction and have five or more types of lengths.