Pneumatic Tire Inboard Groove Placement for Wet Grip and Stability
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Solution Overview
Problem
Conventional pneumatic tires face challenges in achieving balanced wet performance, uneven wear resistance, and steering stability in cornering, particularly due to poor design features such as inadequate groove placement and lack of rigidity in tread patterns.
Innovation Solution
The pneumatic tire design incorporates a tread portion with an inboard portion featuring circumferentially extending main grooves and lateral grooves, optimized for water drainage and rigidity, while the outboard portion lacks main grooves but includes second lateral grooves for improved heat radiation and grip, ensuring balanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inboard portion is provided with circumferentially and continuously extending main grooves for water drainage, then wet performance is improved, but steering stability in cornering deteriorates due to reduced tread rigidity
Solution Approach 1:
The tread portion is segmented into an inboard portion with main grooves for water drainage and an outboard portion without main grooves for steering stability. This spatial segmentation allows each region to fulfill its specific function independently, resolving the contradiction between wet performance and steering stability
Solution Approach 2:
Different groove configurations are applied to different regions of the tread. The inboard portion has circumferential main grooves optimized for water evacuation, while the outboard portion maintains a smoother surface for cornering grip, achieving local optimization of both wet performance and steering stability
2Reliability
If the outboard portion is provided with circumferential main grooves for water drainage, then wet performance is improved, but uneven wear resistance deteriorates
Solution Approach 1:
The tread is divided into functional zones where circumferential main grooves are restricted to the inboard portion only. The outboard portion lacks these grooves, preventing the heel-and-toe wear pattern that would otherwise occur, thereby extending tire life while maintaining wet performance through the inboard groove configuration
Solution Approach 2:
Instead of providing circumferential grooves across the entire tread width, the invention inverts the approach by concentrating grooves only in the inboard portion and leaving the outboard portion groove-free, thereby achieving both wet performance and uniform wear characteristics
3Reliability
If the second main groove is positioned too close to the tire equator, then wet performance is improved through better water drainage, but steering stability deteriorates due to reduced tread rigidity in the critical cornering region
Solution Approach 1:
The axial position of the second main groove is optimized within a specific range (0.35 to 0.75 times the inboard portion width from the equator) to balance water drainage efficiency with tread rigidity requirements, achieving parameter optimization that satisfies both wet performance and steering stability
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 exhibits enhanced wet performance, improved uneven wear resistance, and increased steering stability in cornering, as demonstrated by test results showing improved hydroplaning resistance and reduced wear patterns.
Implementation Method 1
The inboard portion is provided with a circumferentially and continuously extending first main groove and a circumferentially and continuously extending second main groove arranged between the first main groove and the inboard tread edge
Data Source
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AI summary
A pneumatic tire (1) including a tread portion (2) having an outboard tread edge (Te2), an inboard tread edge (Te1), an inboard portion (5) defined between the inboard tread edge (Te1) and a tire equator (C) and an outboard portion (6) defined between the outboard tread edge (Te2) and the tire equator (C), wherein the inboard portion (5) is provided with a circumferentially and continuously extending first main groove (11) and a circumferentially and continuously extending second main groove (12) arranged between the first main groove (11) and the inboard tread edge (Te1), an axial distance from the tire equator (C) to a centerline of the second main groove (12) is in a range of from 0.35 to 0.75 times of a width (W1) of the inboard portion (5) and the outboard portion (6) is not provided with any circumferentially and continuously extending main grooves.