Pneumatic Tire Tread Pattern for Wet and Dry Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pneumatic tires face a challenge in achieving simultaneous good steering stability on both dry and wet road surfaces while maintaining uneven wear resistance, as increasing lug grooves enhances drainage but reduces rigidity, and decreasing them compromises wet road stability.
Innovation Solution
A tread pattern configuration featuring a zigzag center main groove, lug grooves with bent portions, and narrow grooves arranged parallel to the center main groove, which enhances steering stability on wet roads and maintains rigidity for dry roads, while preventing uneven wear through specific inclination angles and depth relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lug grooves in the tread portion is increased, then drainage performance is improved and steering stability on wet road surfaces is enhanced, but the rigidity of the tread portion decreases and steering stability on dry road surfaces declines
Solution Approach 1:
The patent divides the drainage function into two separate systems: lug grooves for wet road drainage and narrow circumferential grooves for additional water evacuation. This segmentation allows the lug grooves to be optimized for drainage without requiring excessive numbers that would compromise tread rigidity, while the narrow grooves provide supplementary drainage capacity.
Solution Approach 2:
The patent applies different groove configurations to different regions of the tread. Lug grooves are positioned in specific areas to handle lateral water flow, while narrow circumferential grooves are distributed throughout to manage longitudinal water evacuation. This local optimization allows drainage performance to be enhanced without uniformly reducing tread rigidity across the entire tread portion.
2Strength
If the number of lug grooves in the tread portion is decreased, then the rigidity of the tread portion is maintained and steering stability on dry road surfaces is preserved, but drainage performance decreases and steering stability on wet road surfaces declines
Solution Approach 1:
The patent merges the drainage functions of lug grooves and narrow circumferential grooves into a coordinated system. The lug grooves handle primary water evacuation while the narrow grooves provide secondary drainage capacity, creating a combined drainage system that achieves superior wet road performance without requiring a high density of lug grooves alone, thereby preserving tread rigidity.
3Reliability
If the tread portion is subdivided by the main grooves and the lug grooves, then drainage performance is enhanced, but the tread portion becomes susceptible to uneven wear due to nonuniform rigidity
Solution Approach 1:
The patent strategically positions narrow circumferential grooves at specific locations where rigidity uniformity is most critical for preventing uneven wear. These grooves are arranged to create a more uniform rigidity distribution in regions prone to nonuniform wear, while maintaining effective drainage performance through the coordinated action of lug grooves and narrow grooves.
Data Source
AI summary
Provided is a pneumatic tire including a tread portion, sidewall portions, and bead portions. The tread portion comprises a center main groove extending in the tire circumferential direction and a shoulder main groove located outward of the center main groove and extending in the tire circumferential direction. A land portion is defined between the center main groove and the shoulder main groove. The center main groove has a zigzag shape in the tire circumferential direction. Lug grooves extending inward from the shoulder main groove in the tire lateral direction and terminating without communicating with the center main groove are provided in the land portion. A bent portion bent toward a first side in the tire circumferential direction is formed at a terminating end of each of the lug grooves. Narrow grooves extending discontinuously in the tire circumferential direction without communicating with the bent portions are formed in the land portion.