GB1574425A - Flexible reinforcing structures - Google Patents

Flexible reinforcing structures Download PDF

Info

Publication number
GB1574425A
GB1574425A GB11059/76A GB1105976A GB1574425A GB 1574425 A GB1574425 A GB 1574425A GB 11059/76 A GB11059/76 A GB 11059/76A GB 1105976 A GB1105976 A GB 1105976A GB 1574425 A GB1574425 A GB 1574425A
Authority
GB
United Kingdom
Prior art keywords
cords
glass
reinforcing structure
materials
steel
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.)
Expired
Application number
GB11059/76A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dunlop Ltd
Original Assignee
Dunlop Ltd
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 Dunlop Ltd filed Critical Dunlop Ltd
Priority to GB11059/76A priority Critical patent/GB1574425A/en
Priority to FI770798A priority patent/FI770798A/fi
Priority to SE7703070A priority patent/SE7703070L/en
Priority to DE19772712033 priority patent/DE2712033A1/en
Priority to JP3025477A priority patent/JPS52112679A/en
Priority to AU23418/77A priority patent/AU509626B2/en
Priority to FR7708354A priority patent/FR2344412A1/en
Publication of GB1574425A publication Critical patent/GB1574425A/en
Expired legal-status Critical Current

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
    • B60C9/18—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
    • B60C2009/2012—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers
    • B60C2009/2029—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers with different cords in the same layer, i.e. cords with different materials or dimensions

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
  • Reinforced Plastic Materials (AREA)
  • Tyre Moulding (AREA)
  • Laminated Bodies (AREA)
  • Ropes Or Cables (AREA)

Description

(54) IMPROVEMENTS IN AND RELATING TO FLEXIBLE REINFORCING STRUCTURES (71) We DUNLOP LLMITED, a British Company of Dunlop House, Ryder Street, St. James's, London SW.1, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to a flexible reinforcing structure and in particular, though not exclusively, to a reinforcing structure for a radial ply tyre.
A radial ply tyre commonly comprises a flexible reinforcement extending circumferentially around the tyre in the form of a substantially inextensible reinforcing belt to restrain extension of the tyre in its circumferential direction. Reinforcing belts for this application conventionally are formed from a plurality of substantially parallel reinforcing cords embedded in flexible polymeric material, and the belts so formed are applied to a partly built tyre such that in the final assembly of the tyre the reinforcing cords extend at a small angle to the circumferential direction of the tyre.
Various reinforcing cord materials such as cotton, rayon, man-made fibres including polyvinyl, alcohol, aramids, and steel, and glass fibres have been proposed and have specific advantages for certain applications.
However, associated with each of these materials are certain disadvantages and it has not hereto been possible to provide a reinforcing belt which overcomes the disadvantages of certain reinforcing materials without introducing further disadvantages.
Thus, organic fibres such as cotton and rayon have the disadvantage of being difficult to handle especially under certain humidity conditions. whilst glass fibres which are not prone to humidity difficulties and are relatively easily handleabfe have a poor compression resistance. Other materials such as steel and like metals do not suffer the problems associated with organic fibres and glass fibres as aforementioned but are relatively expensive. They are also of a high weight in terms of density and this results in the quality of a wire reinforced tyre being very dependent on the uniformity with which the wires are positioned in the tyre.
One object of the present invention is to provide an improved flexible reinforcing structure.
According to the present invention there is provided a flexible reinforcing structure comprising reinforcing cords embedded with mutually parallel alignment in a flexible polymeric material, said cords being individually one or the other of two materials, one of which materials is glass and the other of which materials is metallic, said cords being arranged so that in plan view two or more cords of a first of said two materials alternate with one or more cords of the second of said two materials.
Embodiments of the invention will now be described by way of example only with reference to the accompanying drawings in which: Figure 1 is a cross-section of a tyre; Figure 2 is an enlarged view of part of the tyre with portions of the tyre removed for clarity; Figure 3 is a view similar to Figure 2 showing a further embodiment.
Referring now to Figure 1, a tyre 10 includes one pair of beads 12, 14 and a carcass 16 extending between the beads.
A breaker assembly 18 is positioned on the carcass 16 and extends circumferentially below a tread portion 20 moulded on the tyre.
As can best be seen in Figure 2 the breaker assembly comprises a plurality of cords 22 embedded in a layer of polymeric material 24. The cords 22 extend circum ferentially around the tyre and traverse the equatorial plane at an angle of 20 . The cords 22 are formed individually from one or the other of two materials, one of which materials is metallic and the other of which materials is glass. The metallic cords are designated 22s and the glass cords are designated 22g. The cords 22 are arranged in a single layer in which a pair of glass cords 22g alternate with a single steel cord 22s.
In the embodiment of Figure 3 the cords 22 are arranged in two layers with the glass cords 22g above the steel cords 22s. The glass cords 22g are arranged in pairs above but between a pair of steel cords 22s. Thus when viewed in plan, i.e. in the direction of arrow A of Figure 1, the pair of glass cords 22g alternate with a single steel cord 22s.
The use of glass cords in the reinforcing structure reduces the weight and cost of the structure as compared with one formed wholly from cords of a metal such as steel whilst the presence of some metal, preferably steel, cords enables adequate reinforcing strength to be obtained without the use of an otherwise large number of glass or other cords which would increase the bulk of the reinforcing structure. Accordingly, the number of metal cords used in relation to the number of glass cords is to be selected depending on the required strength to weight and strength to volume ratios of the reinforcing structure.
It has been found that a particularly suitable reinforcing structure for use as a reinforcing belt of a radial ply tyre can be formed by a weftless construction of 1 X 4 x 0.25 mm steel cords each alternating with two ECG 75-510 glass filament cords embedded in a rubber-like material such as resorcinol/formaldehyde latex composition arranged in the form of two layers embedded in styrene butadiene rubber.
In the designation ECG 75-5/0 (as supplied by Pittsburg Plate Glass) for the glass filament cords, E indicates that the glass composition is electrical C indicates that filaments are continuous G indicates a filament diameter in the range 0.00035 to 0.00040 75 indicates a spun yarn linear density or count of 7,500 yards/lb.
-5 indicates that the cord comprises 5 strands twisted together /0 indicates that the cord is a simple bunch of 5 strands.
WHAT WE CLAIM IS: 1. A flexible reinforcing structure comprising reinforcing cords embedded with mutually parallel alignment in a flexible polymeric material, said cords being individually one or the other of two materials, one of which materials is glass and the other of which materials is metallic, said cords being arranged so that in plan view two or more cords of a first of said two materials alternate with one or more cords of the second of said two materials.
2. A flexible reinforcing structure according to claim 1 wherein said reinforcing cords are arranged in two layers, the cords of one of said layers being of metallic material and the cords of the other of said layers being of glass.
3. A flexible reinforcing structure according to claim 1 wherein said cords are arranged in a single layer.
4. A flexible reinforcing structure according to any preceding claim wherein equal numbers of cords of the first of said materials alternate with an equal number of cords of the second of said materials.
5. A flexible reinforcing structure according to any preceding claim wherein said glass cords are formed from a plurality of filaments.
6. A flexible reinforcing structure according to any preceding claim wherein said metallic material is steel.
7. A flexible reinforcing structure according to claim 6 wherein each of said steel cords are formed from a single cord having four strands each of 0.25 mm diameter.
8. A flexible reinforcing structure according to claim 7 wherein for each steel cord there is provided a pair of glass cords.
9. A flexible reinforcing structure according to claim 8 when claims 4, 5, or 6 are directly or indirectly dependent on claim 1 or claim 2, wherein said steel cords are arranged in one layer and said glass cords are arranged in another layer.
10. A reinforcing structure according to any preceding claim wherein said polymeric material is a styrene butadiene rubber.
11. A breaker including a reinforcing structure as claimed in any one of claims 1 to 10.
12. A tyre including a breaker according to claim 11.
13. A tyre constructed and arranged substantially as herein described with reference to the - accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (13)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    ferentially around the tyre and traverse the equatorial plane at an angle of 20 . The cords 22 are formed individually from one or the other of two materials, one of which materials is metallic and the other of which materials is glass. The metallic cords are designated 22s and the glass cords are designated 22g. The cords 22 are arranged in a single layer in which a pair of glass cords 22g alternate with a single steel cord 22s.
    In the embodiment of Figure 3 the cords 22 are arranged in two layers with the glass cords 22g above the steel cords 22s. The glass cords 22g are arranged in pairs above but between a pair of steel cords 22s. Thus when viewed in plan, i.e. in the direction of arrow A of Figure 1, the pair of glass cords 22g alternate with a single steel cord 22s.
    The use of glass cords in the reinforcing structure reduces the weight and cost of the structure as compared with one formed wholly from cords of a metal such as steel whilst the presence of some metal, preferably steel, cords enables adequate reinforcing strength to be obtained without the use of an otherwise large number of glass or other cords which would increase the bulk of the reinforcing structure. Accordingly, the number of metal cords used in relation to the number of glass cords is to be selected depending on the required strength to weight and strength to volume ratios of the reinforcing structure.
    It has been found that a particularly suitable reinforcing structure for use as a reinforcing belt of a radial ply tyre can be formed by a weftless construction of 1 X 4 x 0.25 mm steel cords each alternating with two ECG 75-510 glass filament cords embedded in a rubber-like material such as resorcinol/formaldehyde latex composition arranged in the form of two layers embedded in styrene butadiene rubber.
    In the designation ECG 75-5/0 (as supplied by Pittsburg Plate Glass) for the glass filament cords, E indicates that the glass composition is electrical C indicates that filaments are continuous G indicates a filament diameter in the range 0.00035 to 0.00040
    75 indicates a spun yarn linear density or count of 7,500 yards/lb.
    -5 indicates that the cord comprises 5 strands twisted together /0 indicates that the cord is a simple bunch of 5 strands.
    WHAT WE CLAIM IS: 1. A flexible reinforcing structure comprising reinforcing cords embedded with mutually parallel alignment in a flexible polymeric material, said cords being individually one or the other of two materials, one of which materials is glass and the other of which materials is metallic, said cords being arranged so that in plan view two or more cords of a first of said two materials alternate with one or more cords of the second of said two materials.
  2. 2. A flexible reinforcing structure according to claim 1 wherein said reinforcing cords are arranged in two layers, the cords of one of said layers being of metallic material and the cords of the other of said layers being of glass.
  3. 3. A flexible reinforcing structure according to claim 1 wherein said cords are arranged in a single layer.
  4. 4. A flexible reinforcing structure according to any preceding claim wherein equal numbers of cords of the first of said materials alternate with an equal number of cords of the second of said materials.
  5. 5. A flexible reinforcing structure according to any preceding claim wherein said glass cords are formed from a plurality of filaments.
  6. 6. A flexible reinforcing structure according to any preceding claim wherein said metallic material is steel.
  7. 7. A flexible reinforcing structure according to claim 6 wherein each of said steel cords are formed from a single cord having four strands each of 0.25 mm diameter.
  8. 8. A flexible reinforcing structure according to claim 7 wherein for each steel cord there is provided a pair of glass cords.
  9. 9. A flexible reinforcing structure according to claim 8 when claims 4, 5, or 6 are directly or indirectly dependent on claim 1 or claim 2, wherein said steel cords are arranged in one layer and said glass cords are arranged in another layer.
  10. 10. A reinforcing structure according to any preceding claim wherein said polymeric material is a styrene butadiene rubber.
  11. 11. A breaker including a reinforcing structure as claimed in any one of claims 1 to 10.
  12. 12. A tyre including a breaker according to claim 11.
  13. 13. A tyre constructed and arranged substantially as herein described with reference to the - accompanying drawings.
GB11059/76A 1976-03-19 1976-03-19 Flexible reinforcing structures Expired GB1574425A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
GB11059/76A GB1574425A (en) 1976-03-19 1976-03-19 Flexible reinforcing structures
FI770798A FI770798A (en) 1976-03-19 1977-03-14
SE7703070A SE7703070L (en) 1976-03-19 1977-03-17 FLEXIBLE REINFORCEMENT OR REINFORCEMENT STRUCTURE, SPECIFIC FOR PNEUMATIC DECK
DE19772712033 DE2712033A1 (en) 1976-03-19 1977-03-18 FLEXIBLE REINFORCEMENT STRUCTURE
JP3025477A JPS52112679A (en) 1976-03-19 1977-03-18 Flexible reinforced struture and breaker
AU23418/77A AU509626B2 (en) 1976-03-19 1977-03-18 Tyre breaker
FR7708354A FR2344412A1 (en) 1976-03-19 1977-03-21 FLEXIBLE REINFORCEMENT STRUCTURE, ESPECIALLY FOR TIRES WITH RADIAL BLADES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB11059/76A GB1574425A (en) 1976-03-19 1976-03-19 Flexible reinforcing structures

Publications (1)

Publication Number Publication Date
GB1574425A true GB1574425A (en) 1980-09-10

Family

ID=9979257

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11059/76A Expired GB1574425A (en) 1976-03-19 1976-03-19 Flexible reinforcing structures

Country Status (7)

Country Link
JP (1) JPS52112679A (en)
AU (1) AU509626B2 (en)
DE (1) DE2712033A1 (en)
FI (1) FI770798A (en)
FR (1) FR2344412A1 (en)
GB (1) GB1574425A (en)
SE (1) SE7703070L (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989004245A1 (en) * 1987-11-13 1989-05-18 Holroyd Associates Limited A flexible reinforced polymeric material and a method of forming such a material
US5695578A (en) * 1995-02-27 1997-12-09 Pirelli Coordinamento Pneumatici Tire with a reinforced belt band of alternating first and second cords

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2734764A1 (en) * 1995-05-30 1996-12-06 Michelin & Cie TIRE WITH A REINFORCING TAPE WITH CIRCUMFERENTIAL ELEMENTS.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989004245A1 (en) * 1987-11-13 1989-05-18 Holroyd Associates Limited A flexible reinforced polymeric material and a method of forming such a material
US5098768A (en) * 1987-11-13 1992-03-24 Bridgestone/Firestone Inc. Flexible reinforced polymeric material and a method of forming such a material
US5695578A (en) * 1995-02-27 1997-12-09 Pirelli Coordinamento Pneumatici Tire with a reinforced belt band of alternating first and second cords

Also Published As

Publication number Publication date
AU2341877A (en) 1978-09-21
FI770798A (en) 1977-09-20
SE7703070L (en) 1977-09-20
FR2344412A1 (en) 1977-10-14
FR2344412B1 (en) 1978-10-20
AU509626B2 (en) 1980-05-22
DE2712033A1 (en) 1978-01-19
JPS52112679A (en) 1977-09-21

Similar Documents

Publication Publication Date Title
US4284117A (en) Steel belted radial ply tires with cap plies employing single yarn reinforcing elements
US2826233A (en) Pneumatic tires
US3390714A (en) Tire reinforcing system
US3612139A (en) Novel bead structure for pneumatic tires
US4262726A (en) Radial tire with a low angle carcass overlay ply
US4363346A (en) Pneumatic tire including gas absorbing cords
KR930700293A (en) Tires with high strength reinforcement
KR20120030958A (en) Pneumatic tire and method for making a pneumatic tire
EP0288987B1 (en) Improvements in the reinforcing armouring of tyres for vehicle wheels
ES8203728A1 (en) Reinforcing cord for elastomeric articles, shaped articles of reinforced elastomeric material, more particularly pneumatic tyres for vehicles, and a process for the manufacture of reinforcing cord.
US4407347A (en) Pneumatic tire
EP0016114B1 (en) A composite reinforcement cord for reinforcing elastomeric articles and method of making a highly stretchable radial tire
GB1008397A (en) Airplane tire and retreading same
GB1534689A (en) Pneumatic tyres for off-road vehicles
US3516465A (en) Reinforced tire
EP1256652B1 (en) Metallic cord
US3794097A (en) Pneumatic tire
GB1534690A (en) Pneumatic tyres for off-road vehicles
RU2003134957A (en) CROWN REINFORCEMENT FOR PNEUMATIC TIRES
US4098316A (en) Bead structure for pneumatic tires
GB1574425A (en) Flexible reinforcing structures
US3874982A (en) Tire construction with improved reinforcement
US3708007A (en) Pneumatic tire including belt cables
US6041839A (en) Metallic 4+3 cord for the reinforcement of elastomers
US2532395A (en) Cord

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee