Ballistic Resilient Run-Flat Tire Polyurethane Coating
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Solution Overview
Problem
Conventional run-flat tires are not adequately resilient to ballistic damage, such as rifle shots and improvised explosive devices, which can lead to immediate disablement of combat or law enforcement vehicles, making it difficult for them to escape danger zones.
Innovation Solution
A ballistic resilient run-flat tire design featuring a tire carcass with a polyurethane inner coating and an optional antiballistic panel, incorporating a central tire inflation system, liquid sealant, and a thermally cured polyurethane liner to maintain pressure and support the vehicle's load even after puncture, allowing for extended travel without air pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional pneumatic tires are used, then comfort and ride quality are improved, but the tires are prone to becoming flat from punctures or wear
Solution Approach 1:
The tire system is segmented into multiple functional layers: an inner polyurethane run-flat layer that provides puncture resistance and load support, and an outer pneumatic tire layer that provides comfort and traction. This segmentation allows each layer to specialize in its function without compromising the other.
Solution Approach 2:
The invention uses composite material construction combining polyurethane rubber for the run-flat inner layer with traditional pneumatic tire materials for the outer layer. This composite structure integrates the puncture resistance and load-bearing capabilities of polyurethane with the comfort and traction properties of pneumatic tires.
2Reliability
If solid polyurethane tires are used, then puncture resistance is improved, but cushioning and handling characteristics deteriorate
Solution Approach 1:
The tire is divided into functional segments where the solid polyurethane inner layer handles puncture resistance and load support, while the outer pneumatic tire layer handles cushioning and handling characteristics. This segmentation allows each material to optimize its strengths without being constrained by the weaknesses of the other.
Solution Approach 2:
By combining solid polyurethane with pneumatic tire materials in a composite structure, the invention achieves both puncture resistance from the polyurethane and desirable handling characteristics from the pneumatic outer layer, eliminating the need to choose between the two.
3Reliability
If solid polyurethane tires are used, then run-flat capability is improved, but internal heat build-up increases
Solution Approach 1:
The tire structure segments the heat management function to the pneumatic outer layer which can dissipate heat through its air-filled structure, while the polyurethane inner layer focuses on providing run-flat capability. This segmentation prevents heat accumulation in the polyurethane layer.
Solution Approach 2:
The composite material structure combines polyurethane's run-flat capabilities with pneumatic materials' superior heat dissipation properties, allowing the system to maintain run-flat functionality without suffering from the excessive heat build-up that plagues solid polyurethane tires.
4Duration of action of moving object
If run-flat tire structures are added, then run-flat distance is improved, but device complexity increases
Solution Approach 1:
The tire is segmented into distinct functional layers with the polyurethane run-flat layer positioned internally and the pneumatic tire externally. This clear segmentation allows for modular manufacturing and assembly, reducing overall system complexity despite the enhanced run-flat capabilities.
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 tire maintains pneumatic characteristics and supports vehicle load for an extended distance (at least 30 miles) after being compromised, providing a safe escape route from ballistic incidents while maintaining comfort and preventing overheating.
Implementation Method 1
a polyurethane inner coating inside the tire carcass that defines a hollow pressurized chamber within the ballistic resilient run-flat tire
Implementation Method 2
When the puncture occurs the liquid is pressed by air pressure into the hole and it forms a matrix of fiber and particles to seal it
Implementation Method 3
a thermally cured polyurethane liner to maintain pressure and support the vehicle's load even after puncture
Implementation Method 4
providing a safe escape route from ballistic incidents while maintaining comfort and preventing overheating
Data Source
AI summary
A ballistic resilient run-flat tire device, kit and method for manufacturing the same are presented for providing a vehicle a capability of traveling for at least 30 miles at 30 miles per hour, after the device has been compromised as of result of exposure due to ballistic ordinance rifle shots such as 7.62×39 mm and 7.62×54R or air loss from road hazard punctures. The device includes a tire carcass and a polyurethane inner coating inside the tire carcass that defines an inflatable hollow chamber within the ballistic resilient run-flat tire. The tire carcass has an annular tread, sidewalls, and beads. The polyurethane inner coating inside the tire carcass defining a hollow chamber provides additional protection along the sidewalls and tread of the tire carcass. The kit includes the un-interconnected elements of the device. The method includes the steps of curing, discharging, filling, injecting, introducing, mounting, obtaining, and preparing.