Self-Pumping Vent Holes for Solid Rubber Tire Cooling
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Solution Overview
Problem
Solid rubber tires used in heavy construction equipment experience excessive heat buildup during continuous operation, leading to accelerated deterioration and premature wear due to insufficient heat dissipation.
Innovation Solution
Incorporating self-pumping vent holes with rounded cross-sectional shapes into the sidewalls of the tires, spaced to maintain all solid rubber material within 12% of the tire's diameter from any vent hole, allowing air to be pumped in and out upon rolling contact, thereby reducing heat buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If solid rubber tires are used for continuous 24-hour operation, then productivity is improved, but excessive heat buildup occurs leading to accelerated deterioration and premature wear
Solution Approach 1:
The tire is segmented with multiple vent holes distributed throughout the sidewalls, dividing the heat dissipation function across numerous small openings rather than relying on a single cooling mechanism. This segmentation allows heat to be dissipated from multiple locations simultaneously, effectively reducing overall heat buildup during continuous operation.
Solution Approach 2:
The tire incorporates a porous structure through the vent holes that allow air penetration and flow through the rubber matrix. This porous configuration enables convective heat transfer by allowing cooling air to pass through the tire structure, carrying heat away from the rubber material during rotation.
2Temperature
If vent holes are formed in the wear layer to cool the tire, then heat dissipation is improved, but uneven rolling surface is created due to significant diameter voids
Solution Approach 1:
The vent holes are positioned specifically in the sidewalls rather than in the wear layer or tread area, localizing the cooling function to regions where voids would not affect rolling surface uniformity. This spatial differentiation allows heat dissipation without compromising the integrity of the rolling surface.
Solution Approach 2:
The vent holes are given rounded cross-sectional shapes rather than sharp angular forms. This curvature minimizes the creation of uneven surfaces and reduces stress concentration points that could lead to premature failure, while still maintaining effective air flow paths for cooling.
3Temperature
If large diameter holes are used for cooling, then heat dissipation is improved, but cushioning performance deteriorates due to reduced solid rubber material
Solution Approach 1:
Instead of using a single large cooling hole that would severely compromise cushioning, the invention employs multiple smaller vent holes that provide sufficient cooling surface area while maintaining adequate solid rubber material for cushioning performance. The cumulative effect of numerous small holes achieves the required heat dissipation without excessive removal of structural material.
Solution Approach 2:
The invention changes the parameters of the cooling holes from large diameter to small diameter with increased quantity. This parameter transformation maintains the total cooling surface area while preserving the cushioning properties of the tire by keeping the solid rubber matrix intact and continuous.
4Strength
If cushioning holes are placed at small tire radii near the wheel rim, then cushioning performance is improved, but heat dissipation from the wear layer becomes insufficient
Solution Approach 1:
The cooling function is extended to a new dimension by adding vent holes in the sidewalls at multiple radial positions, not just at the traditional small radius location near the rim. This dimensional expansion of the cooling network allows heat to be dissipated from various radial zones including regions closer to the wear layer, while maintaining the beneficial cushioning holes at the rim area.
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 implementation of self-pumping vent holes effectively reduces excessive heat in the tire, prolonging its lifespan by maintaining a cooler temperature and preventing uneven wear.
Implementation Method 1
pumping of air into and out of the multiplicity of self-pumping vent holes upon rolling contact with the ground
Implementation Method 2
a solid rubber tire with a built in cooling mechanism can reduce the heat build up in the tire
Data Source
AI summary
A solid rubber tire with a multiplicity of self-pumping vent holes formed into opposed spaced apart sidewalls of the solid rubber tire. The self-pumping vent holes each extend from the side walls into the solid rubber tire about one-half the spaced apart distance and parallel to the rotation axis of the tire. Each of the multiplicity of self-pumping vent holes has a maximum cross-sectional dimension of between 0.5% and 1.5% of the maximum tire diameter. Any and all parts of the solid rubber material in the tire are at a distance of less than 12% of the original maximum diameter of the tire from any one of the multiplicity of self-pumping vent holes so that heat that may result in the solid rubber tire from its use is dissipated and temperature of the rubber in the tire is reduced by pumping of air into and out of the multiplicity of self-pumping vent holes upon rolling contact with the ground.