Pneumatic Tire Center Blocks with Open Shallow Grooves
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Heavy-duty radial tires for trucks and buses face challenges in maintaining both heel and toe wear resistance and wet performance due to block patterns with deep circumferential main grooves, which decrease rigidity and increase susceptibility to wear.
Innovation Solution
The pneumatic tire design incorporates four or more circumferential main grooves with center land portions featuring narrow shallow grooves that remain open when the tire contacts the ground, dispersing ground contact pressure and enhancing wet performance while maintaining heel and toe wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deep circumferential main grooves are used to improve wet performance, then wet performance is improved, but block rigidity decreases making blocks susceptible to heel and toe wear
Solution Approach 1:
The center land portion is segmented into multiple center blocks by center lug grooves, and each center block is further segmented into smaller sub-blocks by narrow shallow grooves. This segmentation distributes ground contact pressure across multiple smaller contact areas, reducing the stress on individual blocks and suppressing heel and toe wear while maintaining adequate rigidity through the overall block structure
Solution Approach 2:
Different regions of the tread are given different groove characteristics: the center land portion has narrow shallow grooves that remain open to maintain edge effect for wet performance, while the shoulder land portions have deeper grooves for water evacuation. This local differentiation allows each region to optimize for its specific functional requirements without compromising overall tire performance
2Reliability
If block patterns are designed to improve braking performance on snowy road surfaces, then braking performance is improved, but heel and toe wear resistance decreases
Solution Approach 1:
The center blocks are divided into smaller sub-blocks by narrow shallow grooves, creating multiple small contact patches that maintain grip on snowy surfaces while distributing wear across all sub-blocks. This segmentation allows the tire to benefit from the biting edges of multiple small blocks for braking performance while reducing the wear rate on each individual block through pressure distribution
Solution Approach 2:
The narrow shallow grooves are designed to remain open under load, dynamically maintaining their edge effect for wet and snowy traction. The open groove structure allows the block edges to engage with the road surface for braking performance while the groove geometry prevents complete closure, sustaining the biting edge functionality throughout the tire's service life
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 configuration effectively suppresses heel and toe wear while improving wet performance by maintaining block rigidity and utilizing the edge effect of the open grooves, providing a compatible solution for both wear resistance and wet traction.
Implementation Method 1
the ground contact pressure exerted on the center blocks when the tire comes into contact with the ground is dispersed via the narrow shallow grooves
Implementation Method 2
the narrow shallow grooves remain open without closing. Thus, the narrow shallow grooves display an edge effect, improving the wet performance of the tire
Data Source
AI summary
A pneumatic tire includes at least four circumferential main grooves extending in a tire circumferential direction and at least five land portions defined by the at least four circumferential main grooves. A center land portion includes a plurality of center lug grooves extending through the center land portion in a tire lateral direction and disposed at predetermined intervals in the tire circumferential direction, and a plurality of center blocks that are defined by the plurality of center lug grooves. The center blocks each include a narrow shallow groove that extends through the center block in the tire lateral direction and that remains open when the tire comes into contact with the ground.