Pneumatic Tire Crown Rib Cooling Slots and Holes
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Solution Overview
Problem
High-performance tires for high-speed running face challenges in maintaining high-speed durability and steering stability while preventing thermal deterioration due to heat generation in the crown rib, which is exacerbated by the use of sipes that compromise wear resistance.
Innovation Solution
An asymmetrical tread pattern with crown circumferential grooves, a central narrow circumferential groove, cooling slots, and cooling holes is employed to manage temperature rise without reducing rib rigidity, combining these features to enhance durability, stability, and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If sipes are employed in the crown rib to reduce heat generation, then the heat generation is reduced, but the steering stability is deteriorated due to deficiency of the rigidity of the crown rib
Solution Approach 1:
The crown rib is segmented into multiple regions by providing cooling slots and cooling holes, dividing it into a first crown-rib portion and a second crown-rib portion. This segmentation allows heat to be dissipated from specific areas without compromising the overall structural integrity and rigidity of the crown rib, thereby reducing heat generation while maintaining steering stability.
Solution Approach 2:
Cooling slots are provided in the first crown-rib portion and cooling holes are provided in the second crown-rib portion, creating different local cooling structures in different regions of the crown rib. This local quality approach allows optimized heat dissipation in each region while maintaining the necessary rigidity distribution, resolving the contradiction between heat reduction and steering stability.
2Stability of the object's composition
If the rigidity of the crown rib is increased to provide good steering stability, then the steering stability is improved, but heat generation is increased due to relatively higher ground pressure
Solution Approach 1:
By segmenting the crown rib into multiple portions with cooling slots and cooling holes, the structure maintains high rigidity for steering stability while creating pathways for heat dissipation. The segmentation allows the crown rib to be stiff where needed for stability but incorporates cooling features to manage heat generation from ground pressure.
Solution Approach 2:
The cooling slots and cooling holes, which create voids in the crown rib structure, are designed to convert the potential harm of heat generation into a benefit by facilitating heat dissipation. The ground pressure that generates heat also forces air through these cooling features, turning the harmful heat into a controlled thermal management system that maintains steering stability while preventing overheating.
3Temperature
If cooling slots are provided to reduce temperature raise, then the cooling effect is improved, but the rib rigidity is reduced
Solution Approach 1:
The cooling structure is segmented into two types: cooling slots in the first crown-rib portion and cooling holes in the second crown-rib portion. This segmentation distributes the cooling function across different structures with different impacts on rigidity, allowing effective heat dissipation while minimizing the overall reduction in rib rigidity.
Solution Approach 2:
Different cooling structures are applied to different portions of the crown rib based on local requirements. The cooling slots and cooling holes are positioned in specific regions where heat dissipation is most needed, while maintaining the rigidity of other portions. This local quality approach optimizes the balance between cooling effectiveness and rigidity preservation.
4Temperature
If sipes are employed to adjust rigidity and reduce heat generation, then the heat generation is reduced, but the wear resistance of the tread portion is deteriorated
Solution Approach 1:
Instead of using traditional sipes that compromise wear resistance, the crown rib is segmented into multiple portions with cooling slots and cooling holes. This segmentation provides heat dissipation pathways without creating the surface disruptions that sipes create, thereby maintaining wear resistance while still reducing heat generation.
Solution Approach 2:
The cooling slots and cooling holes provide a more durable solution for heat management compared to sipes. While sipes are surface-level features that wear down and compromise tread integrity, the cooling slots and holes are integrated into the crown rib structure itself, providing long-term heat dissipation without sacrificing wear resistance.
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
The described tread pattern effectively controls temperature rise during high-speed running, maintaining high levels of high-speed durability, steering stability, and wear resistance by balancing cooling effectiveness with rib rigidity.
Implementation Method 1
cooling holes disposed in a ground contacting surface of the crown-rib outside portion
Data Source
AI summary
A pneumatic tire comprises a tread portion provided with an asymmetrical tread pattern comprising a pair of crown circumferential grooves defining a crown rib therebetween. The crown rib is provided with: a central narrow circumferential groove subdividing the crown rib into a crown-rib outside portion and a crown-rib inside portion; cooling slots extending from the crown circumferential grooves; and cooling holes.