GB2423751A - Pneumatic tyre protection system - Google Patents
Pneumatic tyre protection system Download PDFInfo
- Publication number
- GB2423751A GB2423751A GB0504449A GB0504449A GB2423751A GB 2423751 A GB2423751 A GB 2423751A GB 0504449 A GB0504449 A GB 0504449A GB 0504449 A GB0504449 A GB 0504449A GB 2423751 A GB2423751 A GB 2423751A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tyre
- nitrogen
- lyre
- valve
- oxygen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 15
- 238000010926 purge Methods 0.000 claims abstract 2
- 238000004880 explosion Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 claims description 2
- 238000006731 degradation reaction Methods 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 16
- 239000001301 oxygen Substances 0.000 description 16
- 229910052760 oxygen Inorganic materials 0.000 description 16
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- QFXZANXYUCUTQH-UHFFFAOYSA-N ethynol Chemical group OC#C QFXZANXYUCUTQH-UHFFFAOYSA-N 0.000 description 1
- 229940110728 nitrogen / oxygen Drugs 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C5/00—Inflatable pneumatic tyres or inner tubes
- B60C5/001—Inflatable pneumatic tyres or inner tubes filled with gas other than air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C29/00—Arrangements of tyre-inflating valves to tyres or rims; Accessories for tyre-inflating valves, not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
A second tyre valve is fitted in a rim of a wheel assembly; with the valve core removed from the second tyre valve, air is purged from a tyre at atmospheric pressure with> 95% Nitrogen entering the tyre through the existing tyre valve to leave an atmosphere of> 95% Nitrogen in the tyre. After replacing the valve core in the second tyre valve, the tyre is then inflated with the same gas mixture as that used for purging, which can be produced simply and economically on site from the same compressed air feed previously used for tyre inflation.
Description
Pneumatic Tyre Protection System
Description
Definitions "Tyre" means "pneumatic tyre" which typically is inflated with air or Nitrogen.
"Air" comprises 78% Nitrogen, 20.9% Oxygen, 1% Argon, 0.1% trace gases and variable amounts of Water Vapour.
"Nitrogen" includes Argon, which is more inert than Nitrogen and has an even slower permeation rate.
"Active Oxygen" is that % of the 20.9% of Oxygen in the air, which will permeate readily to atmosphere through a lyre carcass.
">"means "greater than" and "<"means "less than".
"OTR" means "Off the road" and covers those tyres used on earth moving equipment and the like.
2. Background - Safety
It is a world wide mandatory requirement that all aircraft tyres fitted with brakes are inflated with Nitrogen containing less than 5% Oxygen.
Typically this is achieved by inflating an aircraft lyre, which already has an atmospheric bar of air (containing 20.9% Oxygen) in the tyre cavity, to 5 bar gauge (6 bar absolute) with 99.9% Nitrogen and then delating the lyre to atmospheric pressure. This means that the Oxygen content of the residual atmospheric bar, prior to inflation with 99.9% Nitrogen, is: 20.9+(5xO.1)2j,4 =3.6%Oxygen When the brakes are used on an aircraft in an aborted take-off an enormous amount of energy / heat is absorbed by the brakes. The brakes can then heat the tyres to a level that the tyres give off flammable gases, which when combined with Oxygen in the tyre cavity can cause an explosion if the tyres are inflated with compressed air.
Combustion of the gases, that can be produced from the excessive heating of any lyre will not take place so long as there is less than 5% Oxygen in the lyre cavity.
The excessive heating of tyres also occurs with OTR tyres and over the years there have been a number of OTR lyre explosions, which could have been prevented if the lyre cavity had contained less than 5% Oxygen.
The heat sources causing OTR lyre explosions were listed in an article in the January 1994 issue of Quarry Management as: "- vehicle contact with a power line - welding or oxyacetylene heat application to wheel components - brake, wheel motor or wheel hub overheating - lightening strike to vehicle - tyre fire (usually initiated by one of the above)" Pneumatic Tyre Protection System
Description (continued)
3. Background - Tyre Life
If a lyre is inflated with air, then the active Oxygen in the air in accordance with Dalton's Law of Partial Pressures, will leave the lyre cavity permeating through the lyre carcass at a very much faster rate than the Nitrogen content of the air.
This theoretical difference in permeation rates have been confirmed in tests carried out on car tyres inflated with air, which prove that that the active Oxygen starts permeating through the lyre carcass immediately after inflation. Car tyres inflated with air, which have started with 20. 9% Oxygen, have been recorded with Oxygen levels as low as 10% at the end of a tyre's legal life.
Oxygen escaping from the tyre cavity will oxidise and thereby cause accelerated degradation of the lyre carcass.
If there is water vapour present in the lyre cavity, then Oxygen will also cause rusting of any exposed or uncoated steel reinforcement in the lyre carcass, as both gases permeate to atmosphere.
The varying quantities of Water / Water Vapour that are present in compressed air, will cause varying pressure losses in each lyre on a vehicle.
If a lyre is inflated with the correct dry Nitrogen/Oxygen mixture taking into account the Law of Partial Pressures, then it will in every instance retain pressure better than a lyre inflated with dry compressed air and even better still than a lyre inflated with wet compressed air.
4. Statement of Invention
A second tyre valve is fitted in the tyre wheel rim. With the lyre valve core removed from the second tyre valve, the air in the lyre can be purged at atmospheric pressure to leave an atmospheric bar of Nitrogen of the required purity in the lyre.
The lyre valve core is then replaced in the second lyre valve the lyre can then be inflated with the required purity of Nitrogen.
This invention allows the use of > 95% Nitrogen / <5% Oxygen gas mixtures, which can be produced easily on site wherever tyres are inflated with compressed air.
Claims (2)
- Pneumatic Tyre Protection System Claims The Invention makes it possible touse> 95% Nitrogen for purging, whereas previously the desired purity level could only be achieved by using Nitrogen of much higher purity.With > 95% Nitrogen in the tyre cavity, not only can tyre explosions be prevented but lyre life can be extended by minimising: 1. Tyre pressure loss and resulting heat build-up
- 2. Oxidisation and resulting degradation of the tyre carcass 5. Rusting of any steel reinforcement in the tyre 6. Rusting of the steel wheel flange interface with the tyre
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0504449A GB2423751A (en) | 2005-03-03 | 2005-03-03 | Pneumatic tyre protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0504449A GB2423751A (en) | 2005-03-03 | 2005-03-03 | Pneumatic tyre protection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0504449D0 GB0504449D0 (en) | 2005-04-06 |
| GB2423751A true GB2423751A (en) | 2006-09-06 |
Family
ID=34430601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0504449A Withdrawn GB2423751A (en) | 2005-03-03 | 2005-03-03 | Pneumatic tyre protection system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2423751A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4197895A (en) * | 1978-10-02 | 1980-04-15 | Reyes Jose V | Traction device for motor vehicles |
| GB2047638A (en) * | 1979-02-17 | 1980-12-03 | Continental Gummi Werke Ag | Gas for inflating tyres |
| WO2001064458A1 (en) * | 2000-03-02 | 2001-09-07 | Martin Diaz Garcia | Improved tire |
| GB2398043A (en) * | 2003-02-08 | 2004-08-11 | Ricci Walker | Tyre inflating device using nitrogen |
-
2005
- 2005-03-03 GB GB0504449A patent/GB2423751A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4197895A (en) * | 1978-10-02 | 1980-04-15 | Reyes Jose V | Traction device for motor vehicles |
| GB2047638A (en) * | 1979-02-17 | 1980-12-03 | Continental Gummi Werke Ag | Gas for inflating tyres |
| WO2001064458A1 (en) * | 2000-03-02 | 2001-09-07 | Martin Diaz Garcia | Improved tire |
| GB2398043A (en) * | 2003-02-08 | 2004-08-11 | Ricci Walker | Tyre inflating device using nitrogen |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0504449D0 (en) | 2005-04-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |