SYSTEM AND METHOD FOR EXTENDING THE RANGE OF RUN-FLAT TIRES

• US 20080077293A1
• Filed: 09/05/2007
• Published: 03/27/2008
• Est. Priority Date: 05/09/2006
• Status: Abandoned Application

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Fitzgibbons, Patrick
• Application Number:
  US11/850,385
• Publication Number:
  US 20080077293A1
• Time in Patent Office: Days
• US Class Current: 701/37
• CPC Class Codes: B60C 17/00 Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
• CPC Class Codes: B60G 17/0185 for failure detection
• CPC Class Codes: B60G 2400/52 in tyre
• CPC Class Codes: B60G 2500/20 Spring action or springs
• CPC Class Codes: B60G 2500/32 of only one vehicle part or side
• CPC Class Codes: B60G 2800/214 by varying the load distribution
• CPC Class Codes: B60G 2800/80 Detection or control after a system or component failure

Abstract

A method and system for extending the range of run-flat tires by providing ride height control. When the vehicle has a damaged tire or tires the ride height of an appropriate suspension system(s) is capable of being adjusted to achieve a level attitude for the vehicle thus preventing destructive loads from being placed on the damaged run-flat tire(s).

Claims

1. A method for extending the operating range of a deflated run-flat tire on a vehicle having a plurality of adjustable wheel supports, comprising the steps of:

determining that a run-flat tire on the vehicle is deflated; and

adjusting at least one of a plurality of adjustable wheel supports to change the vehicle attitude to prevent additional weight and side loads from being placed on at least one deflated run-flat tire.

2. The method of claim 1, wherein the step of adjusting includes adjusting one or more of the plurality of adjustable wheel supports by a distance substantially equal to a difference in rolling radius between an inflated run-flat tire and a deflated run-flat tire.

3. The method of claim 1, wherein the vehicle includes a pair of parallel wheels with separate run-flat tires having separate wheels located opposite each other on opposite sides of the vehicle and mounted on respective suspension components attached to a chassis of the vehicle, the plurality of adjustable wheel supports includes a separate adjustable height support located to provide a suspension height adjustment between each respective wheel and the chassis, and the step of adjusting includes adjusting at least one of the plurality of adjustable wheel supports to compensate for tilting of the vehicle caused by the at least one deflated run-flat tire.

4. The method of claim 3, wherein the step of adjusting includes contracting at least one adjustable wheel support corresponding to a run-flat tire that is still inflated to compensate for tilting of the vehicle caused by the at least one deflated run-flat tire.

5. The method of claim 4, wherein the step of determining that a run-flat tire is deflated includes monitoring air pressure in at least one run-flat tire of the vehicle.

6. The method of claim 5, wherein the step of adjusting includes monitoring vehicle tilt.

7. The method of claim 3, wherein the step of adjusting includes extending an adjustable wheel support corresponding to a run-flat tire that is deflated to compensate for tilting of the vehicle caused by the at least one deflated run-flat tire.

8. The method of claim 7, wherein the step of determining that a tire is deflated includes monitoring air pressure in the at least one run-flat tire of the vehicle.

9. The method of claim 8, wherein the step of adjusting includes monitoring vehicle tilt.

22. The method of claim 1 wherein the step of adjusting includes contracting at least one of the wheel supports corresponding to a run-flat tire that is still inflated to compensate for tilting of the vehicle caused by the at least one deflated run-flat tire.

23. The method of claim 1 wherein the step of adjusting includes extending an adjustable wheel support corresponding to a run-flat tire that is deflated to compensate for tilting of the vehicle caused by the at least one deflated run-flat tire.

10. A system for extending the operating range of a deflated run-flat tire on a vehicle having a plurality of adjustable wheel supports, the system comprising:

means for detecting at least one deflated run-flat tire on the vehicle; and

means for adjusting at least one of a plurality of adjustable wheel supports to change the vehicle attitude to prevent additional weight and side loads from being placed on the at least one deflated run-flat tire.

11. The system of claim 10, wherein the means for adjusting is adapted to adjust at least one of the plurality of adjustable wheel supports by a distance substantially equal to a difference in rolling radius between an inflated run-flat tire and a deflated run-flat tire.

12. The system of claim 11, wherein the vehicle includes a pair of parallel wheels having separate wheels located opposite each other on opposite sides of the vehicle and mounted on respective suspension components attached to a vehicle chassis, the plurality of adjustable wheel supports including a separate adjustable height support located to provide a suspension height adjustment between each respective wheel and the chassis.

13. The system of claim 12 wherein the vehicle includes a second pair of parallel wheels having separate wheels located opposite each other on opposite sides of the vehicle and mounted on respective suspension components attached to the chassis, said second pair of parallel wheels being longitudinally separated along the vehicle chassis from the first recited pair of parallel wheels;

and

the plurality of adjustable tire supports including a separate adjustable support located to provide a suspension height adjustment between the chassis and each respective wheel of the second pair of parallel wheels.

14. The system of claim 13, wherein the means for adjusting is adapted to compensate for tilting in a longitudinal and/or lateral direction of the vehicle.

15. The system of claim 13, wherein the means for adjusting is adapted to use compressed air or pressurized liquid to control the plurality of adjustable tire supports.

16. The system of claim 13, wherein the vehicle is a military tactical vehicle.

17. In a system for extending the operating range of a deflated run-flat tire on a military tactical vehicle having a plurality of adjustable wheel supports, the improvement comprising:

means for detecting at least one deflated run-flat tire on the vehicle; and

means for adjusting at least one of a plurality of adjustable wheel supports to change the vehicle attitude to prevent additional weight and side loads from being placed on the at least one deflated run-flat tire.

18. The system of claim 17, wherein the means for adjusting is adapted to adjust at least one of the plurality of adjustable wheel supports by a distance substantially equal to a difference in rolling radius between an inflated run-flat tire and a deflated run-flat tire.

19. The system of claim 17, wherein the vehicle includes a pair of parallel wheels having separate wheels located on opposite sides of the vehicle and mounted on respective suspension components attached to a vehicle chassis, and the plurality of adjustable wheel supports includes a separate adjustable height support located to provide a suspension height adjustment between each respective wheel and the chassis.

20. The system of claim 17, wherein the vehicle includes a second pair of parallel wheels having separate wheels located on opposite sides of the vehicle and mounted on respective suspension components attached to a vehicle chassis, said second pair of parallel wheels being longitudinally separated along the vehicle chassis from the first recited pair of parallel wheels;

and

the plurality of adjustable wheel supports include a separate adjustable height support located to provide a suspension height adjustment between the chassis and each respective wheel of the second pair of parallel wheels.

21. The system of claim 20, wherein the means for adjusting is adapted to compensate for tilting in a longitudinal and/or lateral direction of the vehicle.