GB2063185A - Tyre crown reinforcements - Google Patents

Tyre crown reinforcements Download PDF

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Publication number
GB2063185A
GB2063185A GB8029332A GB8029332A GB2063185A GB 2063185 A GB2063185 A GB 2063185A GB 8029332 A GB8029332 A GB 8029332A GB 8029332 A GB8029332 A GB 8029332A GB 2063185 A GB2063185 A GB 2063185A
Authority
GB
United Kingdom
Prior art keywords
belt
reinforcing members
tyre
heat
edges
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.)
Granted
Application number
GB8029332A
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GB2063185B (en
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.)
Continental AG
Original Assignee
Continental Gummi Werke AG
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 Continental Gummi Werke AG filed Critical Continental Gummi Werke AG
Publication of GB2063185A publication Critical patent/GB2063185A/en
Application granted granted Critical
Publication of GB2063185B publication Critical patent/GB2063185B/en
Expired legal-status Critical Current

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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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

A pneumatic tyre has a crown- reinforcing belt (6) comprising two superposed cord fabric plies (7, 8), the reinforcing cords (9) thereof being formed from a non- or substantially non-heat shrinkable material, e.g. steel wire, whilst the reinforcing cords (10) thereof are formed from a heat shrinkable plastics material, e.g. a polyester or polyamide. During vulcanization of the tyre, the reinforcing cords (10) shrink in length and thereby provide edge regions R of the belt which have a reduced cord density and thus greater pliability. <IMAGE>

Description

SPECIFICATION Pneumatic vehicle tyre The present invention relates to a pneumatic vehicle tyre having a belt provided with filamentary reinforcing members arranged in cord ply, which belt at its edges has a reduced filament density and is adapted to be substantially inextensible in the circumferential direction of the tyre and extends substantially over the width of the tread strip region of the tyre.
Belted tyres are known which are serrated at their edges in order to reduce the filament density, so that the belt in the region of its edges has greater pliability imparted thereto.
A belt structure so made requires subsequent treatment of the individual belt strips, in that a suitable mechanical treatment is employed to carry out zig-zag or the like cutting movement in the region of the belt edges.
It is an object of the present invention to produce a belt which at its edges has a reduced filament density without having to perform subsequent mechanical treatment.
According to the present invention there is provided a pneumatic vehicle tyre having a belt comprised of filamentary reinforcing members arranged in cord ply, which belt at its edges has a reduced filament density, in which the reinforcing members comprise members formed from non- or substantially non-heat shrinkable material and members formed from heat-shrinkable plastics material, the reinforcing members formed of heat-shrinkable plastics material being located between the reinforcing members formed of non- or substantially nonheat shrinkable material.
The advantage of such a belt construction is that a belt or belted strip assembled from reinforcing plies comprising the aforesaid reinforcing members only requires the edges of the belt to receive a straight cutting edge during severing. The belt so produced, is then processed in conventional manner during tyre manufacture. During vulcanization, the belt is subjected to a heat treatment which leads to shrinkage of the plastics material reinforcing members, whilst the steel or the like wires or cords substantially retain their length. After heat treatment the ends of the plastics material reinforcing members have moved inward relative to the cut edges of the steel cords or wires, so that the filament density in the region of the belt edges has been reduced to the required manner.By this arrangement the resilience of the belt is increased in the region of its edges during manufacture of the tyre.
The present invention will be further illustrated, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a radial part section through a pneumatic vehicle tyre formed as a belted tyre; and Figure 2 is a partial plan view of the belt of the tyre of Figure 1.
A tyre body 1 is comprised substantially of rubber or rubber-like material and has a substantially U-shaped cross-section. The tyre body 1 has a carcase reinforcement which is comprised offila- ments 2, in the form of wires, cords or the like, extending radially of the tyre. The filaments 2 are anchored in tyre beads 4 by being looped around bead cores 3. The tyre body 1 also has a tread strip 5.
A belt 6, substantially inextensible in the circumferential direction of the tyre, is provided between the carcase and the tread strip 5 of the pneumatic tyre.
The belt 6 extends substantially over the width of the tread strip 5 and according to the illustrated embodiment is comprised of two superposed cord fabric plies 7 and 8. Whilst the reinforcing members 9 and 10 of the fabric plies 7 and 8 extend parallel to one another in each ply, the reinforcing members of one ply intersect those of the other ply. Preferably, a symmetrical arrangement is provided in such a manner that the reinforcing members 9 and 10 each extend at an angle of substantially 15 to 25 to the circumferential direction of the tyre.
Edge region R of the belt is of importance, the width of such region being about from 5 to 10% of the total width of the belt. In this edge region R there are only the free ends of the reinforcing members 9 extending in a straight line which are comprised of steel or the like material or a material which by the heat treatment has not been or substantially not subjected to a change in length. The reinforcing members 10 located between the reinforcing members 9 are heat-shrinkable. The reinforcing members 10 are made of a polyester or a polyamide, and thus of such material that, during vulcanization, each filament is subjected to a shrinkage about twice the dimension R. If desired, it is possible to arrange two or even three reinforcing members having heatshrinkable properties which in turn are distinguished by varying heat shrinkage between steel reinforcing members.It is also possible to provide two reinforcing members 9 made of steel between two successive reinforcing members 10 in the circumferential direction of the tyre, although the resilience in the region of the belt edges is best influenced in that the reinforcing members 9 of steel are utilised only individually.
1. A pneumatic vehicle tyre having a belt comprised of filamentary reinforcing members arranged in cord ply, which belt at its edges has a reduced filament density, in which the reinforcing members comprise members formed from non- or substantially non-heat shrinkable material and members formed from heat-shrinkable plastics material, the reinforcing members formed of heat-shrinkable plastics material being located between the reinforcing members formed of non- or substantially nonheat shrinkable material.
2. A pneumatic vehicle tyre as claimed in claim 1, in which, seen in the circumferential direction of the tyre, a reinforcing member formed of non- or substantially non-heat shrinkable material is followed by a reinforcing member formed of a heatshrinkable plastics material.
3. A pneumatic vehicle tyre as claimed in claim 1, in which, two or more reinforcing members formed
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Pneumatic vehicle tyre The present invention relates to a pneumatic vehicle tyre having a belt provided with filamentary reinforcing members arranged in cord ply, which belt at its edges has a reduced filament density and is adapted to be substantially inextensible in the circumferential direction of the tyre and extends substantially over the width of the tread strip region of the tyre. Belted tyres are known which are serrated at their edges in order to reduce the filament density, so that the belt in the region of its edges has greater pliability imparted thereto. A belt structure so made requires subsequent treatment of the individual belt strips, in that a suitable mechanical treatment is employed to carry out zig-zag or the like cutting movement in the region of the belt edges. It is an object of the present invention to produce a belt which at its edges has a reduced filament density without having to perform subsequent mechanical treatment. According to the present invention there is provided a pneumatic vehicle tyre having a belt comprised of filamentary reinforcing members arranged in cord ply, which belt at its edges has a reduced filament density, in which the reinforcing members comprise members formed from non- or substantially non-heat shrinkable material and members formed from heat-shrinkable plastics material, the reinforcing members formed of heat-shrinkable plastics material being located between the reinforcing members formed of non- or substantially nonheat shrinkable material. The advantage of such a belt construction is that a belt or belted strip assembled from reinforcing plies comprising the aforesaid reinforcing members only requires the edges of the belt to receive a straight cutting edge during severing. The belt so produced, is then processed in conventional manner during tyre manufacture. During vulcanization, the belt is subjected to a heat treatment which leads to shrinkage of the plastics material reinforcing members, whilst the steel or the like wires or cords substantially retain their length. After heat treatment the ends of the plastics material reinforcing members have moved inward relative to the cut edges of the steel cords or wires, so that the filament density in the region of the belt edges has been reduced to the required manner.By this arrangement the resilience of the belt is increased in the region of its edges during manufacture of the tyre. The present invention will be further illustrated, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a radial part section through a pneumatic vehicle tyre formed as a belted tyre; and Figure 2 is a partial plan view of the belt of the tyre of Figure 1. A tyre body 1 is comprised substantially of rubber or rubber-like material and has a substantially U-shaped cross-section. The tyre body 1 has a carcase reinforcement which is comprised offila- ments 2, in the form of wires, cords or the like, extending radially of the tyre. The filaments 2 are anchored in tyre beads 4 by being looped around bead cores 3. The tyre body 1 also has a tread strip 5. A belt 6, substantially inextensible in the circumferential direction of the tyre, is provided between the carcase and the tread strip 5 of the pneumatic tyre. The belt 6 extends substantially over the width of the tread strip 5 and according to the illustrated embodiment is comprised of two superposed cord fabric plies 7 and 8. Whilst the reinforcing members 9 and 10 of the fabric plies 7 and 8 extend parallel to one another in each ply, the reinforcing members of one ply intersect those of the other ply. Preferably, a symmetrical arrangement is provided in such a manner that the reinforcing members 9 and 10 each extend at an angle of substantially 15 to 25 to the circumferential direction of the tyre. Edge region R of the belt is of importance, the width of such region being about from 5 to 10% of the total width of the belt. In this edge region R there are only the free ends of the reinforcing members 9 extending in a straight line which are comprised of steel or the like material or a material which by the heat treatment has not been or substantially not subjected to a change in length. The reinforcing members 10 located between the reinforcing members 9 are heat-shrinkable. The reinforcing members 10 are made of a polyester or a polyamide, and thus of such material that, during vulcanization, each filament is subjected to a shrinkage about twice the dimension R. If desired, it is possible to arrange two or even three reinforcing members having heatshrinkable properties which in turn are distinguished by varying heat shrinkage between steel reinforcing members.It is also possible to provide two reinforcing members 9 made of steel between two successive reinforcing members 10 in the circumferential direction of the tyre, although the resilience in the region of the belt edges is best influenced in that the reinforcing members 9 of steel are utilised only individually. CLAIMS
1. A pneumatic vehicle tyre having a belt comprised of filamentary reinforcing members arranged in cord ply, which belt at its edges has a reduced filament density, in which the reinforcing members comprise members formed from non- or substantially non-heat shrinkable material and members formed from heat-shrinkable plastics material, the reinforcing members formed of heat-shrinkable plastics material being located between the reinforcing members formed of non- or substantially nonheat shrinkable material.
2. A pneumatic vehicle tyre as claimed in claim 1, in which, seen in the circumferential direction of the tyre, a reinforcing member formed of non- or substantially non-heat shrinkable material is followed by a reinforcing member formed of a heatshrinkable plastics material.
3. A pneumatic vehicle tyre as claimed in claim 1, in which, two or more reinforcing members formed of heat-shrinkable plastics material are arranged between two successive reinforced members formed of non- or substantially non-heat shrinkable material, seen in the circumferential direction of the tyre.
4. A pneumatic vehicle tyre as claimed in claim 3, in which the reinforcing members of heat-shrinkable plastics material are each comprised of plastics material of varying heat shrinkage.
5. A pneumtic vehicle tyre as claimed in any preceding claims in which the non- or substantially non-heat shrinkable reinforcing members are formed of steel wires or cords.
6. A pneumatic vehicle tyre as claimed in any preceding claim in which the heat-shrinkable reinforcing members are formed of a polyamide or a polyester.
7. A pneumatic vehicle tyre, substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
GB8029332A 1979-10-12 1980-09-11 Tyre crown reinforcements Expired GB2063185B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792941397 DE2941397A1 (en) 1979-10-12 1979-10-12 VEHICLE AIR TIRE WITH A GOOD

Publications (2)

Publication Number Publication Date
GB2063185A true GB2063185A (en) 1981-06-03
GB2063185B GB2063185B (en) 1983-09-01

Family

ID=6083362

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8029332A Expired GB2063185B (en) 1979-10-12 1980-09-11 Tyre crown reinforcements

Country Status (3)

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DE (1) DE2941397A1 (en)
FR (1) FR2467091A1 (en)
GB (1) GB2063185B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5351735A (en) * 1991-02-05 1994-10-04 Sumitomo Rubber Industries, Ltd. Pneumatic tire with belt ply including both steel cords and aromatic polyamide cords
US5695578A (en) * 1995-02-27 1997-12-09 Pirelli Coordinamento Pneumatici Tire with a reinforced belt band of alternating first and second cords
US6513561B1 (en) * 2000-01-27 2003-02-04 Bridgestone/Firestone North American Tire, Llc Pneumatic tire having multiple modulus body cord to reduce rolling resistance
US7431063B2 (en) * 2001-11-27 2008-10-07 Pirelli Pneumatici S.P.A. Method for producing a belt structure for a vehicle tyre and vehicle tyre including the belt structure
US20120103499A1 (en) * 2009-05-12 2012-05-03 Michelin Recherche Et Technique S.A. Reinforcement comprising two reinforcing materials and tire comprising such a reinforcement
EP3377336A4 (en) * 2015-11-19 2019-06-19 Bridgestone Americas Tire Operations, LLC Fiber belt including ferrous element for magnetic manipulation

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10333282A1 (en) * 2003-07-18 2005-02-03 Continental Aktiengesellschaft Pneumatic tires for motor vehicle wheels
JP4761858B2 (en) * 2005-07-11 2011-08-31 株式会社ブリヂストン Pneumatic tire
JP4761866B2 (en) * 2005-07-25 2011-08-31 株式会社ブリヂストン Pneumatic tire
FR3038546A1 (en) * 2015-07-10 2017-01-13 Michelin & Cie PNEUMATIC COMPRISING ELASTOMERIC MIXTURES WITH LOW SULFUR CONTENT

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1310491A (en) * 1961-03-15 1962-11-30 Kleber Colombes Improvements to tire casings
FR1296859A (en) * 1961-08-02 1962-06-22 Dunlop Rubber Co Improvements made to the reinforcements of the treads of pneumatic tires
CA1046914A (en) * 1974-03-14 1979-01-23 Claude H. Allard Tire cord fabrics for belts of belted pneumatic tires

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5351735A (en) * 1991-02-05 1994-10-04 Sumitomo Rubber Industries, Ltd. Pneumatic tire with belt ply including both steel cords and aromatic polyamide cords
US5695578A (en) * 1995-02-27 1997-12-09 Pirelli Coordinamento Pneumatici Tire with a reinforced belt band of alternating first and second cords
US6513561B1 (en) * 2000-01-27 2003-02-04 Bridgestone/Firestone North American Tire, Llc Pneumatic tire having multiple modulus body cord to reduce rolling resistance
US7431063B2 (en) * 2001-11-27 2008-10-07 Pirelli Pneumatici S.P.A. Method for producing a belt structure for a vehicle tyre and vehicle tyre including the belt structure
US20120103499A1 (en) * 2009-05-12 2012-05-03 Michelin Recherche Et Technique S.A. Reinforcement comprising two reinforcing materials and tire comprising such a reinforcement
JP2012526692A (en) * 2009-05-12 2012-11-01 コンパニー ゼネラール デ エタブリッスマン ミシュラン Reinforcing material comprising two reinforcing materials and tire having such a reinforcing material
US8763664B2 (en) * 2009-05-12 2014-07-01 Societe De Technologie Michelin Reinforcement comprising two reinforcing materials and tire comprising such a reinforcement
EP3377336A4 (en) * 2015-11-19 2019-06-19 Bridgestone Americas Tire Operations, LLC Fiber belt including ferrous element for magnetic manipulation

Also Published As

Publication number Publication date
DE2941397A1 (en) 1981-04-30
GB2063185B (en) 1983-09-01
FR2467091A1 (en) 1981-04-17

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PCNP Patent ceased through non-payment of renewal fee