Two-Wheeled Vehicle Tire Side Surface Geometry for Stability and Absorbability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pneumatic tires for two-wheeled vehicles face challenges in achieving both stability and absorbability, as high rigidity leads to reduced absorbability and low rigidity results in compromised stability.
Innovation Solution
The tire design features a tread with side surfaces extending inward in a radial direction, beads with a core and apex, and a carcass structure that includes a band with organic fibers, where the side surfaces and apex are positioned to form specific angles and ratios to enhance stability and absorbability, allowing the tire to flex while maintaining rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the rigidity of the side part is increased to achieve good stability, then stability is improved, but absorbability deteriorates
Solution Approach 1:
The side part is divided into multiple regions with different rigidity characteristics. The upper side part (from the equator to the maximum width position) has different structural properties than the lower side part, allowing each region to contribute differently to stability and absorbability. This local differentiation enables the tire to exhibit appropriate rigidity in different zones simultaneously.
Solution Approach 2:
The side part structure is designed to dynamically adapt to different operational conditions. The specific geometric configuration (with the reference line at 45-75 degrees to the bead base line and the apex height ratio of 0.5 or more) allows the side part to flex appropriately under load while maintaining structural integrity, achieving both stability and absorbability through dynamic response rather than static rigidity.
2Reliability
If the rigidity of the side part is decreased to improve absorbability, then absorbability is improved, but stability deteriorates
Solution Approach 1:
Different regions of the side part are assigned different structural characteristics. The upper region provides flexibility for absorbability while the lower region maintains structural support for stability. This local quality differentiation resolves the contradiction by allowing each region to optimize for its primary function.
Solution Approach 2:
The side part structure dynamically responds to applied loads by flexing in controlled manner. The geometric parameters (reference line angle of 45-75 degrees, apex height ratio ≥0.5) enable the structure to transition between rigid and flexible states as needed, achieving both stability at rest and absorbability under load.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A pneumatic tire for a two-wheeled vehicle includes a tread, side walls, and beads. When the tire is on normal rim and filled to normal internal pressure, each side surface (52) has reference position (PR) corresponding to radial direction outer edge of each side surface in contact with the rim, and reference line (L1) passing through the reference position (PR) and edge (PT) of the tread surface such that the reference line (L1) is in contact with the rim at the reference position and each side surface (52) extends along the reference line (L1) between the reference position (PR) and edge (PT) of the tread surface, absolute value of angle formed by the reference line (L1) and bead base line (BBL) is from 45 to 75 degrees, and ratio of radial direction height (HA) from the reference position to outer edge (44) of the apex (40), to radial direction height (HS) from the reference position to the edge (PT) of the tread surface, is 0.5 or more.