Pneumatic Tire Bead Back Surface Rim Flange Contact
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In existing pneumatic tires, the bead part deformation under load can lead to strong pressure contact with the rim flange, affecting comfort and uniformity, with room for improvement in both force distribution and precision positioning.
Innovation Solution
The pneumatic tire design features a back surface part arranged closer to the inner side of the rim flange in the tire width direction, with a flat surface connecting to the heel part, and inclined surfaces on the base surface part to distribute forces evenly and prevent pressure contact, ensuring precise positioning and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the back surface part is positioned closer to the rim flange part, then the bead part is better supported, but large forces act on the tire from the rim when the tire receives a load
Solution Approach 1:
The back surface part is designed with a curved surface that gradually approaches the rim flange part from the inner side in the tire radial direction, rather than being flat or abruptly positioned. This curvature allows the contact area to increase gradually under load, distributing the force more evenly and preventing sudden large forces from acting on the tire while maintaining adequate support strength.
2Strength
If the back surface part is positioned closer to the rim flange part, then support is improved, but uniformity of the tire is compromised
Solution Approach 1:
The back surface part employs different surface characteristics in different regions: a first curved surface portion that gradually approaches the rim flange part and a second curved surface portion that connects to the heel part. This local differentiation allows the tire to achieve both strong support where needed and uniform positioning where required, resolving the contradiction between support strength and manufacturing precision.
Data Source
AI summary
A back surface part (13) is arranged on an inner surface (35) facing an inner side of a rim flange part (32) in a tire width direction (H) or arranged closer to the inner side in the tire width direction (H) than the inner surface (35), in a no-load reference state where a pneumatic tire (10) is mounted on an applied rim (30) and the internal pressure of the pneumatic tire (10) is set to atmospheric pressure, and a flat surface part (20) extending linearly along a tire radial direction (R) in the reference state is formed in a connecting portion of the back surface part (13) connected with a heel part (14), thereby making it possible to prevent a large force from acting thereon from the applied rim (30) and to improve uniformity.