Pneumatic Tire Sidewall Texture Layout for Thin-Gauge Styling
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Solution Overview
Problem
Thinning the gauge thickness of tire side walls to reduce weight makes it difficult to improve the appearance of the side wall portion due to reduced unevenness.
Innovation Solution
A pneumatic tire design featuring a large region on the side wall portion composed of small regions with different arithmetic average roughness, formed along both the tire circumferential and radial directions, creating a three-dimensional appearance through contrasting roughness at boundary lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the gauge thickness of the side wall portion is thinned down to reduce tire weight, then the weight of the tire is reduced, but the unevenness is not formed deeply and it becomes difficult to improve the appearance of the side wall portion
Solution Approach 1:
The patent applies local quality by creating regions with different arithmetic average roughness values (Ra1 and Ra2) at specific locations on the side wall portion. By making the roughness values different in the tire width direction, the invention enhances the three-dimensional appearance locally without requiring increased gauge thickness, thus resolving the contradiction between weight reduction and appearance improvement.
Solution Approach 2:
The patent transitions from considering only the thickness dimension to incorporating surface roughness as an additional dimension. By controlling arithmetic average roughness in the tire width direction, the invention creates visual depth and three-dimensional appearance on the thinned side wall, effectively adding a new dimension for appearance enhancement without increasing mass.
2Weight of moving object
If the gauge thickness of the side wall portion is thinned down to reduce tire weight, then the weight of the tire is reduced, but the unevenness depth decreases making appearance improvement difficult
Solution Approach 1:
The patent applies local quality by creating regions with different arithmetic average roughness values (Ra1 and Ra2) at specific locations on the side wall portion. By making the roughness values different in the tire width direction, the invention enhances the three-dimensional appearance locally without requiring increased gauge thickness, thus resolving the contradiction between weight reduction and appearance improvement.
Solution Approach 2:
The patent changes the surface roughness parameter (arithmetic average roughness) as the primary control variable instead of relying on gauge thickness. By specifying different Ra values (0.03-0.3mm for Ra1 and 0.03-0.15mm for Ra2) in different regions, the invention achieves precise control over unevenness appearance while maintaining reduced weight.
3Shape
If multiple pattern element arrays are formed on the side wall portion to improve appearance, then the appearance is enhanced, but the structure becomes more complex
Solution Approach 1:
The patent applies local quality by creating regions with different arithmetic average roughness values (Ra1 and Ra2) at specific locations on the side wall portion. By making the roughness values different in the tire width direction, the invention enhances the three-dimensional appearance locally without requiring increased gauge thickness, thus resolving the contradiction between weight reduction and appearance improvement.
Data Source
AI summary
A pneumatic tire including: a tread portion is in contact with a road surface; and a side wall portion is continuous to the tread portion and positioned inside a tire radial direction of the tread portion. A large region including a plurality of small regions having different arithmetic average roughness outside in a tire width direction is formed on outer surface of the side wall portion. A plurality of large regions are formed along a tire circumferential direction and the tire radial direction. In a boundary line of adjacent large region, small regions having different arithmetic average roughness come into contact with each other.