Pneumatic Tire Recess Geometry for Stone Ejection and Heat Dissipation
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Solution Overview
Problem
Existing pneumatic tire designs face challenges in reducing stone trapping while maintaining heat dissipation and extending tire life, particularly in heavy-duty vehicles like construction vehicles.
Innovation Solution
The tire features circumferential and widthwise grooves with a recess on the groove wall surface of the circumferential groove, inclined towards the widthwise groove, and a curved surface connecting to the bottom, optimizing wind flow for heat dissipation and stone ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a recess is formed on the groove wall surface to increase heat dissipation, then heat dissipation performance is improved, but stone trapping increases
Solution Approach 1:
The recess wall surface incorporates a curved surface with a center of curvature on the widthwise groove side, creating a smooth rounded transition that prevents stone accumulation while maintaining heat dissipation effectiveness. The curved geometry eliminates sharp corners where stones could become trapped.
Solution Approach 2:
The recess is positioned asymmetrically on the groove wall surface opposite to the widthwise groove, with the curved surface oriented toward the widthwise groove. This asymmetric configuration optimizes both heat dissipation flow patterns and stone ejection characteristics.
2Object-affected harmful factors
If the connection point between inclined surface and curved surface is positioned further inward, then stone ejection is improved, but heat dissipation may be reduced
Solution Approach 1:
The position of the connection point between the inclined surface and curved surface is optimized as a critical parameter. By positioning it further inward in the tire radial direction at locations where the recess width is smaller, the design achieves improved stone ejection while maintaining adequate heat dissipation through the balanced geometric configuration.
Solution Approach 2:
Different portions of the recess wall surface have different geometric qualities - the inclined surface provides a steep angle for stone ejection, while the curved surface provides a smooth transition. The connection point position is locally optimized to balance these competing requirements.
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
This design effectively reduces stone trapping while ensuring heat dissipation, leading to an extended tire life by improving airflow and stone ejection mechanisms.
Implementation Method 1
wind flows into the groove efficiently, thereby increasing heat dissipation of the tread rubber
Implementation Method 2
a pneumatic tire that reduces stone trapping while guaranteeing heat dissipation in the tread portion
Data Source
AI summary
A pneumatic tire includes a recess formed on a groove wall surface of a circumferential groove opposite to a widthwise groove. A wall surface defined by the recess includes an inclined surface inclined towards the widthwise groove from a tire radial direction outer side towards a tire radial direction inner side and a curved surface connecting a tire radial direction inner end of the inclined surface to a bottom defined by the recess, the curved surface having a center of curvature on the side of the widthwise groove. As a connection point between the inclined surface and the curved surface is at a position in the tire circumferential direction at which a width W of the recess in the tire width direction is smaller, the connection point is located further inward in the tire radial direction.