Pneumatic Tyre Bead Durability via Side Protector Geometry
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pneumatic tires with thick side protectors enhance stiffness in the radially outer sidewall region, leading to concentrated strain on the bead portion, resulting in durability deterioration.
Innovation Solution
The tire design includes a tread portion with inwardly extending sidewall portions, where at least one sidewall portion is equipped with a side protector that protrudes outwardly, and bead portions with specific dimensions and structures, such as bead apex rubber and carcass plies, to distribute strain uniformly and improve durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If thick side protectors are provided on the sidewall portion, then cut resistance is improved, but strain concentrates on the bead portion resulting in durability deterioration
Solution Approach 1:
The patent applies local quality by providing side protectors with specific dimensional constraints (inner end located outwardly of tyre-maximum-width position, length ratio between tyre inner region and tyre outer region between 0.8-1.2) to achieve different functional requirements in different regions: cut resistance protection on the outer sidewall while maintaining durability in the bead region through controlled strain distribution
2Reliability
If side protectors are positioned with specific dimensions, then strain distribution is improved, but structural complexity increases
Solution Approach 1:
The patent uses parameter changes by defining specific dimensional parameters for the side protectors (inner end position relative to tyre-maximum-width position, length ratio between 0.8-1.2 times) to optimize strain distribution and durability without requiring complex structural modifications to the overall tire design
Data Source
AI summary
A pneumatic tyre includes a tread portion, two axially spaced sidewall portions extending radially inwardly from the tread portion, at least one of the sidewall portions being provided with a side protector that protrudes axially outwardly and having an inner end located radially outwardly of a tyre-maximum-width position, and two axially spaced bead portions connected to radially inward of the respective sidewall portions. Each bead portion includes a bead apex rubber having an outer end in the tyre radial direction being located radially inwardly of the tyre-maximum-width position. A radial length of a tyre inner region from a bead baseline to the outer end of each bead apex rubber is in a range of from 0.8 to 1.2 times a radial length of a tyre outer region from a radially outermost position of the tread portion to the inner end of the side protector.