WO2014182265A1 - A radial aircraft tire reinforced with twisted monofilaments - Google Patents

A radial aircraft tire reinforced with twisted monofilaments Download PDF

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Publication number
WO2014182265A1
WO2014182265A1 PCT/TR2014/000155 TR2014000155W WO2014182265A1 WO 2014182265 A1 WO2014182265 A1 WO 2014182265A1 TR 2014000155 W TR2014000155 W TR 2014000155W WO 2014182265 A1 WO2014182265 A1 WO 2014182265A1
Authority
WO
WIPO (PCT)
Prior art keywords
monofilaments
twisted
aircraft tire
cords
radial
Prior art date
Application number
PCT/TR2014/000155
Other languages
French (fr)
Inventor
Sadettin Fidan
Kürşat AKSOY
Bekir Anıl MERTOL
Burak ILGUN
Original Assignee
Kordsa Global Endustriyel Iplik Ve Kord Bezi Sanayi Ve Ticaret Anonim Sirketi
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kordsa Global Endustriyel Iplik Ve Kord Bezi Sanayi Ve Ticaret Anonim Sirketi filed Critical Kordsa Global Endustriyel Iplik Ve Kord Bezi Sanayi Ve Ticaret Anonim Sirketi
Publication of WO2014182265A1 publication Critical patent/WO2014182265A1/en

Links

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
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
    • B60C9/2003—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords
    • B60C9/2009—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords comprising plies of different materials
    • 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
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/005—Reinforcements made of different materials, e.g. hybrid or composite cords
    • 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
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/0064—Reinforcements comprising monofilaments
    • 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
    • B60C2200/00—Tyres specially adapted for particular applications
    • B60C2200/02—Tyres specially adapted for particular applications for aircrafts

Definitions

  • the present invention relates to a radial aircraft tire which moves at high speed, carries heavy loads and which is inflated at relatively high pressures.
  • nylon multifilament cord fabric with high epdm end per decimeter is generally used in reinforcement of large number of carcass layers and belt layers in aircraft tires.
  • multifilament nylon cord is preferred in reinforcement for aircraft tires due to its superior fatigue resistance.
  • such cords have high level of toughness (breaking energy) and resistance against foreign object damage. That is why nylon multifilament cords are widely used in aircraft tires as carcass, belt and protection layer.
  • one problem with these reinforcements as belt and protection layer is their poor cut resistance against sharp objects.
  • the second problem related with these conventional multifilament nylon cords is loss of their breaking strength during flexing under high tensions.
  • the fretting between the interface filaments having mutually cross angles during flexing under tension gives rise to filament breaks and loss of breaking strength in carcass cords at flex zones. Under tension, the interface filaments of the mutual cord plies have contact points applying sawing effect on each other.
  • the materials having higher cut resistance such as aramide ( evlar, Twaron etc.) are not suitable for being used as reinforcement in aircraft tires due to their poor breaking energies (toughness). When used with very high twist levels in order to increase their breaking energy, this results in drastic loss in breaking strength.
  • the objective of the present invention is to provide a radial aircraft tire reinforced with twisted monofilaments used in aircrafts moving at high speeds with heavy loads.
  • Another objective of the present invention is to provide a radial aircraft tire the durability of which is improved by increasing its resistance against impacts.
  • Figure 1 is the cross-sectional view of the structure of the inventive radial aircraft tire.
  • Figure 2 2x1 is the view of the cord made of two monofilaments.
  • Figure 3 3x 1 is the view of the cord made of three monofilaments.
  • Figure 4 is the view of the cord samples with monofilaments (cross-sections)
  • Figure 5 is the view of the hybrid cord samples with different monofilaments (cross-sections)
  • the inventive radial aircraft tire reinforced with twisted monofilaments (1 ), which is suitable to be used in a vehicle moving at high speeds with heavy loads, has at least one radial carcass (2); tread (3); at least one protective layer (4); at least one belt layer (5); a crown reinforcement(belt package including protective layer) (7) comprising layers or strips reinforced by cords (6) oriented relative to the equatorial plane of the tire at an angle of between 0° and 35° and wherein at least one layer or layer made of strips has cords (6) made of twisted polymeric monofilaments ( Figure 1 ).
  • the cords (6) made of twisted monofilaments can also be used in carcass, belt and/or protection layer in the aircraft tire.
  • These monofilaments which are used are defined as "the polymer fibers having diameter equal or higher than 0.050mm". It is known that the filament diameters of cords currently used as tire reinforcement vary between 0.010 and 0.030 mm.
  • monofilaments are manufactured from nylon 6.6.
  • monofilaments are manufactured from nylon 6 (polycaprolactam).
  • monofilaments are manufactured from PET (polyethylene terephthalate).
  • the twisted cords (6) are in hybrid cord structure comprised of different monofilaments with high modulus (H) and low modulus (L).
  • the diameters of the monofilaments are between 0.050mm and 1.00mm.
  • the cords obtained with these monofilaments comprise minimum 2 and maximum 21 monofilaments.
  • the twist levels of the cords made of monofilaments are between 20tpm and 300 tpm (turns per meter).
  • the twist directions can be Z or S, or combination of these.
  • the strip width of the belt reinforcements is between 5mm and 30mm.
  • the cord density of the monofilament cord fabric or the monofilament cord strip is minimum 25 and maximum 150 epdm (ends per decimeter).
  • the material used as monofilament is preferably nylon 6.6.
  • PET polyethylene terephthalate
  • Hybrid cords comprising nylon 6.6 and PET monofilaments can also be used as reinforcements in carcass (2), belt (5) and protective (4) layers.
  • cords (6) made of filaments are similar to the construction of steel cords well known in tire technology.
  • Some examples of cord constructions can be given as follows: 2x1 , 3x1 , 4x1 , 5x1 , 6x1 , 7xl(or 1 +6), 8x1 , 9x1 , 10x1 , l lxl , 12x1 , 1+2, 1+3, 1+4, 1+5, 1+6, 1+7, 2+2, 2+3, 2+4, 2+5, 3+1 , 3+2, 3+3, 3+4, 3+9 etc.
  • the twist directions can be Z or S, or combination of these.
  • the cord twist can change from 20 to 300 tpm (turns per meter), and the diameters of the monofilaments can change from 0.050 to 1.0mm.
  • Carcass (2) and belt (5) have at least two layers. All or some of the belt layers (5) can be spirally wound in belt package as strip (0° to 5° angle with equatorial plane).
  • the cords (6) made of monofilaments can be used as fabric or strip in their applications. In case of strips, strip width can change from 5mm to 30mm.
  • the cord densities (epdm: ends per decimeter) in fabrics and strips can change from 25 to 150 cord/dm.

Abstract

The present invention relates to a radial aircraft tire reinforced with twisted monofilaments (6) which is used in a vehicle moving at high speed and carrying heavy loads such as plane and which is inflated at relatively high pressures.

Description

DESCRIPTION
A RADIAL AIRCRAFT TIRE REINFORCED WITH TWISTED
MONOFILAMENTS Field of the Invention
The present invention relates to a radial aircraft tire which moves at high speed, carries heavy loads and which is inflated at relatively high pressures.
Background of the Invention
Aircraft tires are subjected to high centrifugal forces and heavy loads on takeoff, and high sudden impact forces during landing. In order to meet the required performance, nylon multifilament cord fabric with high epdm (end per decimeter) is generally used in reinforcement of large number of carcass layers and belt layers in aircraft tires.
In the prior art, multifilament nylon cord is preferred in reinforcement for aircraft tires due to its superior fatigue resistance. At the same time such cords have high level of toughness (breaking energy) and resistance against foreign object damage. That is why nylon multifilament cords are widely used in aircraft tires as carcass, belt and protection layer. However one problem with these reinforcements as belt and protection layer is their poor cut resistance against sharp objects. The second problem related with these conventional multifilament nylon cords is loss of their breaking strength during flexing under high tensions. The fretting between the interface filaments having mutually cross angles during flexing under tension gives rise to filament breaks and loss of breaking strength in carcass cords at flex zones. Under tension, the interface filaments of the mutual cord plies have contact points applying sawing effect on each other. The materials having higher cut resistance such as aramide ( evlar, Twaron etc.) are not suitable for being used as reinforcement in aircraft tires due to their poor breaking energies (toughness). When used with very high twist levels in order to increase their breaking energy, this results in drastic loss in breaking strength.
Summary of the Invention
The objective of the present invention is to provide a radial aircraft tire reinforced with twisted monofilaments used in aircrafts moving at high speeds with heavy loads.
Another objective of the present invention is to provide a radial aircraft tire the durability of which is improved by increasing its resistance against impacts.
Detailed Description of the Invention
"A radial aircraft tire reinforced with twisted monofilaments" developed to fulfill the objective of the present invention is illustrated in the accompanying figures wherein,
Figure 1 is the cross-sectional view of the structure of the inventive radial aircraft tire.
Figure 2 2x1 is the view of the cord made of two monofilaments.
Figure 3 3x 1 is the view of the cord made of three monofilaments.
Figure 4 is the view of the cord samples with monofilaments (cross-sections)
Figure 5 is the view of the hybrid cord samples with different monofilaments (cross-sections)
The components shown in the figures are each given reference numbers as follows:
1. Reinforced radial aircraft tire
2. Radial carcass
3. Tread
4. Protective layer
5. Belt layers
6. Twisted cords 7. Crown reinforcement
H. High modulus monofilament
L. Low modulus monofilament The inventive radial aircraft tire reinforced with twisted monofilaments (1 ), which is suitable to be used in a vehicle moving at high speeds with heavy loads, has at least one radial carcass (2); tread (3); at least one protective layer (4); at least one belt layer (5); a crown reinforcement(belt package including protective layer) (7) comprising layers or strips reinforced by cords (6) oriented relative to the equatorial plane of the tire at an angle of between 0° and 35° and wherein at least one layer or layer made of strips has cords (6) made of twisted polymeric monofilaments (Figure 1 ).
In the preferred embodiment of the invention, the cords (6) made of twisted monofilaments can also be used in carcass, belt and/or protection layer in the aircraft tire. These monofilaments which are used are defined as "the polymer fibers having diameter equal or higher than 0.050mm". It is known that the filament diameters of cords currently used as tire reinforcement vary between 0.010 and 0.030 mm.
In the preferred embodiment of the invention, monofilaments are manufactured from nylon 6.6.
In another embodiment of the invention, monofilaments are manufactured from nylon 6 (polycaprolactam).
In another embodiment of the invention, monofilaments are manufactured from PET (polyethylene terephthalate). In the preferred embodiment of the invention, the twisted cords (6) are in hybrid cord structure comprised of different monofilaments with high modulus (H) and low modulus (L). The diameters of the monofilaments are between 0.050mm and 1.00mm. The cords obtained with these monofilaments comprise minimum 2 and maximum 21 monofilaments. The twist levels of the cords made of monofilaments are between 20tpm and 300 tpm (turns per meter). The twist directions can be Z or S, or combination of these.
In the preferred embodiment of the invention, the strip width of the belt reinforcements is between 5mm and 30mm.
In the preferred embodiment of the invention, the cord density of the monofilament cord fabric or the monofilament cord strip is minimum 25 and maximum 150 epdm (ends per decimeter).
In the invention, the material used as monofilament is preferably nylon 6.6. However, PET (polyethylene terephthalate) can also be used. Hybrid cords comprising nylon 6.6 and PET monofilaments can also be used as reinforcements in carcass (2), belt (5) and protective (4) layers.
The construction of cords (6) made of filaments are similar to the construction of steel cords well known in tire technology. Some examples of cord constructions can be given as follows: 2x1 , 3x1 , 4x1 , 5x1 , 6x1 , 7xl(or 1 +6), 8x1 , 9x1 , 10x1 , l lxl , 12x1 , 1+2, 1+3, 1+4, 1+5, 1+6, 1+7, 2+2, 2+3, 2+4, 2+5, 3+1 , 3+2, 3+3, 3+4, 3+9 etc. The twist directions can be Z or S, or combination of these.
The cord twist can change from 20 to 300 tpm (turns per meter), and the diameters of the monofilaments can change from 0.050 to 1.0mm. Carcass (2) and belt (5) have at least two layers. All or some of the belt layers (5) can be spirally wound in belt package as strip (0° to 5° angle with equatorial plane). The cords (6) made of monofilaments can be used as fabric or strip in their applications. In case of strips, strip width can change from 5mm to 30mm. The cord densities (epdm: ends per decimeter) in fabrics and strips can change from 25 to 150 cord/dm.

Claims

1. A radial aircraft tire reinforced with twisted monofilaments (1) which is suitable to be used in an aircraft moving at high speeds with heavy loads; and characterized in that it
has at least one radial carcass layer (2); one tread (3); at least one protective belt layer (4); at least one belt layer (5); a crown reinforcement (7) comprising two or more layers or layers made of strips reinforced by cords (6) oriented relative to the equatorial plane of the tire at an angle of between 0° and 35° and wherein at least one layer or layer made of strips has cords (6) made of twisted polymeric monofilaments.
2. A radial aircraft tire reinforced with twisted monofilaments (1) according to claim 1 , characterized by cords (6) which are made of twisted monofilaments that can also be used in carcass (2), belt (5) and/or belt protective layer (4) in the aircraft tire.
3. A radial aircraft tire reinforced with twisted monofilaments (1 ) according to claim 1 or 2 characterized by monofilaments which are produced from nylon 6.6
4. A radial aircraft tire reinforced with twisted monofilaments (1) according to claim 1 or 2 characterized by monofilaments which are produced from nylon 6 (polycaprolactam).
5. A radial aircraft tire reinforced with twisted monofilaments ( 1) according to claim 1 or 2 characterized by monofilaments which are produced from PET (polyethylene terephthalate).
6. A radial aircraft tire reinforced with twisted monofilaments (1 ) according to any one of the preceding claims, characterized by cords (6) which have hybrid cord structure comprised of different monofilaments with high modulus (H) and low modulus (L).
7. A radial aircraft tire reinforced with twisted monofilaments (1 ) according to any one of the preceding claims, characterized by monofilaments the diameters of which are 0.050mm to 1.00mm.
8. A radial aircraft tire reinforced with twisted monofilaments (1) according to any one of the preceding claims, characterized by twisted cords (6) which comprise minimum 2 and maximum 21 monofilaments.
9. A radial aircraft tire reinforced with twisted monofilaments (1) according to any one of the preceding claims, characterized by twisted cords (6) the twist levels of which are 20tpm to 300tpm (turns per meter).
10. A radial aircraft tire reinforced with twisted monofilaments (1 ) according to any one of the preceding claims, characterized by twisted cords (6) which are twisted in Z or S twist directions, or their combination.
11. A radial aircraft tire reinforced with twisted monofilaments (1) according to any one of the preceding claims, characterized by monofilament cord strip or monofilament cord fabric the cord density of which is minimum 25 and maximum 150 epdm (ends per decimeter).
12. A radial aircraft tire reinforced with twisted monofilaments (1) according to any one of the claims 2 to 1 1 , characterized by belt reinforcement layers made of strips, the strip width of which is 5 mm to 30mm.
PCT/TR2014/000155 2013-05-07 2014-05-07 A radial aircraft tire reinforced with twisted monofilaments WO2014182265A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2013/05442 2013-05-07
TR201305442 2013-05-07

Publications (1)

Publication Number Publication Date
WO2014182265A1 true WO2014182265A1 (en) 2014-11-13

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3006229A4 (en) * 2013-06-04 2016-04-27 Bridgestone Corp Pneumatic tire for aircraft
EP3254871A1 (en) 2016-06-09 2017-12-13 Continental Reifen Deutschland GmbH Reinforcing ply for objects made of elastomer material, preferably for pneumatic vehicle tires and pneumatic vehicle tires as same
EP3254870A1 (en) 2016-06-09 2017-12-13 Continental Reifen Deutschland GmbH Reinforcing ply for objects made of elastomer material, preferably for pneumatic vehicle tires and pneumatic vehicle tires as same
EP3269562A1 (en) 2016-07-15 2018-01-17 Continental Reifen Deutschland GmbH Method for producing a strip-shaped rubber strip reinforced with a strengthening support

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0312038A2 (en) * 1987-10-13 1989-04-19 E.I. Du Pont De Nemours And Company Radial tires containing polyamide monofilament
EP0448901A1 (en) * 1990-03-22 1991-10-02 The Goodyear Tire & Rubber Company Bias ply aircraft tire
DE102008045506A1 (en) * 2008-09-03 2010-03-04 Continental Reifen Deutschland Gmbh Reinforced carrier is made up of two monofilaments, where monofilaments are twisted or interlaced with one another, and monofilaments consist of non-metallic material
WO2012026123A1 (en) * 2010-08-27 2012-03-01 株式会社ブリヂストン Pneumatic radial aircraft tire

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0312038A2 (en) * 1987-10-13 1989-04-19 E.I. Du Pont De Nemours And Company Radial tires containing polyamide monofilament
EP0448901A1 (en) * 1990-03-22 1991-10-02 The Goodyear Tire & Rubber Company Bias ply aircraft tire
DE102008045506A1 (en) * 2008-09-03 2010-03-04 Continental Reifen Deutschland Gmbh Reinforced carrier is made up of two monofilaments, where monofilaments are twisted or interlaced with one another, and monofilaments consist of non-metallic material
WO2012026123A1 (en) * 2010-08-27 2012-03-01 株式会社ブリヂストン Pneumatic radial aircraft tire
EP2610074A1 (en) * 2010-08-27 2013-07-03 Bridgestone Corporation Pneumatic radial aircraft tire

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3006229A4 (en) * 2013-06-04 2016-04-27 Bridgestone Corp Pneumatic tire for aircraft
US10500899B2 (en) 2013-06-04 2019-12-10 Bridgestone Corporation Aircraft pneumatic tire
EP3254871A1 (en) 2016-06-09 2017-12-13 Continental Reifen Deutschland GmbH Reinforcing ply for objects made of elastomer material, preferably for pneumatic vehicle tires and pneumatic vehicle tires as same
EP3254870A1 (en) 2016-06-09 2017-12-13 Continental Reifen Deutschland GmbH Reinforcing ply for objects made of elastomer material, preferably for pneumatic vehicle tires and pneumatic vehicle tires as same
WO2017211518A1 (en) 2016-06-09 2017-12-14 Continental Reifen Deutschland Gmbh Reinforcing ply for articles made of an elastomeric material, preferably for pneumatic vehicle tyres, and pneumatic vehicle tyre
EP3269562A1 (en) 2016-07-15 2018-01-17 Continental Reifen Deutschland GmbH Method for producing a strip-shaped rubber strip reinforced with a strengthening support
DE102016212943A1 (en) 2016-07-15 2018-01-18 Continental Reifen Deutschland Gmbh Method of making a tape-like, strength-enhanced rubber strip

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