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GB2283215A - Motor-cycle radial tyre - Google Patents

Motor-cycle radial tyre Download PDF

Info

Publication number
GB2283215A
GB2283215A GB9322263A GB9322263A GB2283215A GB 2283215 A GB2283215 A GB 2283215A GB 9322263 A GB9322263 A GB 9322263A GB 9322263 A GB9322263 A GB 9322263A GB 2283215 A GB2283215 A GB 2283215A
Authority
GB
United Kingdom
Prior art keywords
tyre
motor
bandage
breaker
cycle
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
GB9322263A
Other versions
GB2283215B (en
GB9322263D0 (en
Inventor
David Robert Watkins
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.)
Sumitomo Rubber Industries Ltd
Original Assignee
Sumitomo Rubber Industries 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 Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Priority to GB9322263A priority Critical patent/GB2283215B/en
Publication of GB9322263D0 publication Critical patent/GB9322263D0/en
Publication of GB2283215A publication Critical patent/GB2283215A/en
Application granted granted Critical
Publication of GB2283215B publication Critical patent/GB2283215B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
    • B60C9/2204—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre obtained by circumferentially narrow strip winding
    • 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
    • B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
    • 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
    • B60C2200/10—Tyres specially adapted for particular applications for motorcycles, scooters or the like

Landscapes

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

Abstract

A radial motor-cycle tyre (1) reinforced by a breaker assembly (5, 7) and a bandage (6) and having in its normally inflated condition a camber value C/L of between 0.5 and 0.7 has a carcass ply (14) of radially disposed cords radially inward of the breaker assembly and is characterised in that the breaker assembly comprises two breaker plies (5, 7) comprising aromatic polyamide cords oppositely inclined at between 16 and 30 degrees to the circumferential direction of the tyre and the bandage (6) comprises nylon cord reinforced material, eg up to 8 nylon cords side by side, and is formed radially outside and adjacent to the breaker assembly and is inclined at less than 5 degrees to the circumferential direction. <IMAGE>

Description

MOTOR-CYCLE RADIAL TYRE This invention relates to radial motor-cycle tyres and in particular but not exclusively to high performance or race motor-cycle tyres.
Such tyres utilise very wide treads which in transverse cross-section are sharply curved to provide good contact with the road surface when the motor-cycle is steeply banked in cornering.
Maintenance of a consistent ground contact area or 'tyre footprint' under all conditions is a major problem in determining general vehicle handling.
Of particular importance in race motorcycle tyres of radial construction is the provision of high cornering power with the good stability to maximise cornering speeds under race conditions.
Present radial motor-cycle race tyres have short sidewalls which extend to the tread edges radially and axially outwardly from the tyre beads. The beads provide engagement to the wheelrim on tapered bead seats. The sidewalls are reinforced by radial carcass plies which when tensioned by the inflation pressure act together with sidewall geometry to provide location of the curved tread regions to withstand cornering forces.
The sharply curved tread region of the tyre is specially reinforced by a reinforcing breaker to give the required structural rigidity to allow for banking over of the motorcycle when cornering whilst giving sufficient flexibility to allow localised tread flattening in the ground contact patch for good road grip.
An object of the present invention is to improve the properties of such tyres.
According to one aspect of the present invention a radial motor-cycle tyre comprises a tread reinforced between its edges by a breaker assembly and a bandage and having in its normally inflated fitted condition a camber value CIL of between 0.5 and 0.7, a reinforcing carcass ply of radially disposed cords extending radially inside the breaker assembly and between two bead regions and wrapped in each bead region around an annular bead core from the axial inside to the outside to form carcass ply turn-ups and between the tread edges and bead regions, tyre sidewalls characterised in that the breaker assembly comprises two breaker plies comprising aromatic polyamide cords oppositely inclined with respect to the circumferential direction of the tyre and the bandage comprises nylon cord reinforced material and is formed radially outside and adjacent to the breaker assembly.
By camber value is meant the ratio OIL between the radial distance C from the centre to the edge of the tyre tread and the axial distance L between the centre and edge of the tread.
Preferably the cords of the breaker plies are inclined at between 16 and 30 degrees and the cord reinforcement of the bandage is inclined at less than 50 to the circumferential direction of the tyre.
The bandage may comprise a single nylon cord spirally wound around the tyre across the breaker assembly or it may comprise a plurality of between 2 and 8 cords formed side by side in a tape and wound spirally around the tyre. the nylon cord or cords are preferably embedded in a rubber compound.
Also preferably the nylon cord is a low extensibility cord having an elongation of less than 8% at 210C under load of one third of the cord breaking load.
Further aspects of the present invention will become apparent from the description of the following embodiments in conjunction with the attached diagrammatic drawing in which: Figure 1 shows in cross-section a 185/55 R17 radial motor-cycle tyre intended for high speed racing.
The tyre 1 of Figure 1 comprises a pair of sidewalls 8 and 9 terminating in bead regions 10 and 11. Each bead region is reinforced by an inextensible annular bead core 12 and 13.
Extending between each bead region is a tyre carcass reinforcement ply 14 which is anchored in each bead region by being turned around the respective bead core 12,13 laterally from the inside to the outside to form a ply turn-up 15,16.
The carcass reinforcement ply 14 comprises a single ply of nylon tyre fabric laid with the cords substantially radially. Each bead region 10,11 further comprises a hard rubber apex member 17,18 which is anchored to each respective bead core 12,13 and extends taperingly radially outwardly.
The tyre 1 has a camber value of 0.6 and comprises a convex tread region 2, having tread edges 3,4, reinforced by a breaker assembly. The breaker assembly comprises two breaker plies 6 and 7 each of which comprises Kevlar (Registered Trade Mark) aramid cord tyre fabric each of 2/165 TEX. The cords in each of the breaker plies 6 and 7 are oppositely inclined to each other at an angle of 250 to the circumferential direction of the tyre.
The radially inner breaker ply 7 is narrower than the radially outer breaker ply 5.
Radially outside and immediately adjacent to the breaker assembly is a bandage comprising a rubber covered single nylon cord of 2/94 TEX. This cord had been subjected to heat stretching by 2% such that the elongation of the cord under a load of one-third of the cord breaking load was 9.2%. The bandage was formed by winding the cord in a spiral manner around the tyre circumference and across the full width of the breaker assembly overlapping the ends of the outermost wider ply 7 by a small amount. Formed in this manner the cord of the bandage lies at substantially 0 to the circumferential direction of the tyre.
In a second embodiment of the present invention the tyre construction was as above except that the bandage was formed from a nylon cord of 2/140TEX.
This cord had been heat stretched by 8% and consequently had a lower elongation of only 6.3t when tested at 210C under a load of one-third of the cornering power.
The resultant tyres have been found to have improved cornering power and stability under all conditions and improved grip. This construction has also been shown to give superior fatigue life.
Whilst the above-described embodiments have a bandage formed by a single rubber coated nylon cord spirally wound around the tyre the bandage may be formed from a spirally wound tape comprising between 2 and 8 cords laid side by side and embedded in rubber.

Claims (9)

1. A radial motor-cycle tyre (1) comprising a tread (2) reinforced between its edges (3,4) by a breaker assembly and a bandage (6) and having in its normally inflated fitted condition a camber value C/L of between 0.5 and 0.7, a reinforcing carcass ply (14) of radially disposed cords extending radially inside the breaker assembly and between two bead regions (10,11) and wrapped in each bead region around an annular bead core (12,13) from the axial inside to the outside to form carcass ply turn-ups (15,16) and between the tread edges (3,4) and bead regions (10,11), tyre sidewalls (8,9) characterised in that the breaker assembly comprises two breaker plies (5,7) comprising aromatic polyamide cords oppositely inclined with respect to the circumferential direction of the tyre and the bandage (6) comprises nylon cord reinforced material and is formed radially outside and adjacent to the breaker assembly.
2. A motor-cycle radial tyre according to claim 1 wherein the cords of the breaker plies (5,7) are inclined at 16 to 30 degrees with respect to the circumferential direction of the tyre.
3. A motor-cycle radial tyre according to either of claims 1 or 2 wherein the nylon cord reinforcement of the bandage is at less than 50 to the circumferential direction of the tyre.
4. A motor-cycle radial tyre according to any of claims 1 to 3 wherein the bandage (6) comprises a single cord spirally wrapped around the circumference of the tyre.
5. A motor-cycle radial tyre according to any of claims 1 to 3 wherein the bandage comprises a plurality of between 2 and 8 nylon cords laid side by side in the form of a tape which is spirally wound around the tyre.
6. A motor-cycle radial tyre according to any of claims 1 to 5 wherein the bandage comprises low extensibility nylon cord having an elongation of less than 8% under a load of one-third of the cord breaking load.
7. A motor-cycle radial tyre according to any of claims 1 to 6 wherein the bandage (6) extends across the full width of the widest breaker ply (5,7).
8. A motor-cycle radial tyre according to any of claims 1 to 7 wherein the radially outermost breaker ply (5) is wider than the radially innermost breaker ply (7).
9. A motor-cycle radial tyre according to any of claims 1 to 8 wherein the bandage comprises nylon cord reinforcement embedded in rubber.
GB9322263A 1993-10-29 1993-10-29 Motor-cycle radial tyre Expired - Fee Related GB2283215B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9322263A GB2283215B (en) 1993-10-29 1993-10-29 Motor-cycle radial tyre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9322263A GB2283215B (en) 1993-10-29 1993-10-29 Motor-cycle radial tyre

Publications (3)

Publication Number Publication Date
GB9322263D0 GB9322263D0 (en) 1993-12-15
GB2283215A true GB2283215A (en) 1995-05-03
GB2283215B GB2283215B (en) 1997-07-23

Family

ID=10744282

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9322263A Expired - Fee Related GB2283215B (en) 1993-10-29 1993-10-29 Motor-cycle radial tyre

Country Status (1)

Country Link
GB (1) GB2283215B (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5529102A (en) * 1994-02-19 1996-06-25 Sumitomo Rubber Industries, Ltd. Motorcycle radial tire with supplementary breaker ply
EP0756949A1 (en) * 1995-08-01 1997-02-05 PIRELLI COORDINAMENTO PNEUMATICI S.p.A. High-transverse-curvature tyre, in particular for a two-wheeled vehicle
EP0808730A1 (en) * 1996-05-22 1997-11-26 PIRELLI COORDINAMENTO PNEUMATICI S.p.A. Pair of high-transverse-curvature tyres, in particular for two-wheeled vehicles, method of controlling the behaviour of such vehicles on a bend and front tyre of said pair
EP0820883A1 (en) * 1996-07-25 1998-01-28 Sumitomo Rubber Industries Limited Motor-cycle radial tyre
EP0822103A1 (en) * 1996-07-29 1998-02-04 PIRELLI COORDINAMENTO PNEUMATICI S.p.A. High-transverse-curvature tire, in particular for use in front wheels of motor-vehicles
EP0928703A1 (en) * 1997-12-29 1999-07-14 PIRELLI PNEUMATICI S.p.A. High transverse curvature tire for two-wheeled vehicles and method for its manufacture
US6397911B1 (en) 1997-12-29 2002-06-04 Pirelli Pneumatici S.P.A. High transverse-curvature motor-bike tire
US6412533B1 (en) 1997-12-29 2002-07-02 Pirelli Pneumatici S.P.A. High transverse-curvature tire for two-wheeled vehicles including specified belt structure
FR2834932A1 (en) * 2002-01-23 2003-07-25 Continental Ag TIRE FOR VEHICLES, ESPECIALLY FOR MOTORCYCLES
KR100637851B1 (en) * 1996-07-29 2007-04-04 피렐리 뉴아티씨 소시에떼 퍼 아찌오니 High-transverse-curvature tire, in particular for use in rear wheels of motor-vehicles

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0157617A2 (en) * 1984-04-06 1985-10-09 Sumitomo Rubber Industries Limited Tyre for motor cycle
GB2157239A (en) * 1984-03-23 1985-10-23 Metzeler Kautschuk Tyres

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2157239A (en) * 1984-03-23 1985-10-23 Metzeler Kautschuk Tyres
EP0157617A2 (en) * 1984-04-06 1985-10-09 Sumitomo Rubber Industries Limited Tyre for motor cycle

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5651845A (en) * 1994-02-19 1997-07-29 Sumitomo Rubber Industries Motorcycle radial tire with supplementary breaker fly
US5529102A (en) * 1994-02-19 1996-06-25 Sumitomo Rubber Industries, Ltd. Motorcycle radial tire with supplementary breaker ply
EP1127714A3 (en) * 1995-08-01 2003-07-02 PIRELLI PNEUMATICI S.p.A. High-transverse-curvature tyre, in particular for a two-wheeled vehicle
EP1127714A2 (en) * 1995-08-01 2001-08-29 PIRELLI PNEUMATICI S.p.A. High-transverse-curvature tyre, in particular for a two-wheeled vehicle
EP0756949A1 (en) * 1995-08-01 1997-02-05 PIRELLI COORDINAMENTO PNEUMATICI S.p.A. High-transverse-curvature tyre, in particular for a two-wheeled vehicle
US6530408B1 (en) 1995-08-01 2003-03-11 Pirelli Coordinamento Pneumatici S.P.A. High-transverse-curvature tire, in particular for a two-wheeled vehicle
US5902425A (en) * 1995-08-01 1999-05-11 Pirelli Coordinamento Pneumatici Spa High-transverse-curvature tire, in particular for a two-wheeled vehicle
US6415841B1 (en) 1996-05-22 2002-07-09 Pirelli Coordinamento Pneumatici S.P.A. Pair of high-transverse-curvature tires for two-wheeled vehicles having different belt structures and method of controlling the behavior of such vehicles on a bend
US5975175A (en) * 1996-05-22 1999-11-02 Pirelli Coordinamento Pneumatici S.P.A. Pair of high-tranverse-curvature tires for two-wheeled vehicles having different belt structures and method of controlling the behavior of such vehicles on a bend
EP0808730A1 (en) * 1996-05-22 1997-11-26 PIRELLI COORDINAMENTO PNEUMATICI S.p.A. Pair of high-transverse-curvature tyres, in particular for two-wheeled vehicles, method of controlling the behaviour of such vehicles on a bend and front tyre of said pair
EP0820883A1 (en) * 1996-07-25 1998-01-28 Sumitomo Rubber Industries Limited Motor-cycle radial tyre
US6755227B2 (en) 1996-07-29 2004-06-29 Pirelli Coordinamento Pneumatici S.P.A. High-transverse-curvature tire, in particular for use in front wheels of motor-vehicles
US6070631A (en) * 1996-07-29 2000-06-06 Pirelli Coordinamento Pneumatici Spa High-transverse-curvature tire, in particular for front wheels of motor-vehicles
KR100637851B1 (en) * 1996-07-29 2007-04-04 피렐리 뉴아티씨 소시에떼 퍼 아찌오니 High-transverse-curvature tire, in particular for use in rear wheels of motor-vehicles
KR100552390B1 (en) * 1996-07-29 2006-06-23 피렐리 뉴아티씨 소시에떼 퍼 아찌오니 High-transverse-curvature tire, in particular for use in front wheels of motor-vehicles
EP0822103A1 (en) * 1996-07-29 1998-02-04 PIRELLI COORDINAMENTO PNEUMATICI S.p.A. High-transverse-curvature tire, in particular for use in front wheels of motor-vehicles
US6397911B1 (en) 1997-12-29 2002-06-04 Pirelli Pneumatici S.P.A. High transverse-curvature motor-bike tire
US6691755B2 (en) 1997-12-29 2004-02-17 Pirelli Pneumatici S.P.A. High transverse-curvature tire for two-wheeled vehicles including specified belt structure
US6699343B2 (en) 1997-12-29 2004-03-02 Pirelli Pneumatici S.P.A. Method of manufacturing a high transverse-curvature motor-bike tire
US6412533B1 (en) 1997-12-29 2002-07-02 Pirelli Pneumatici S.P.A. High transverse-curvature tire for two-wheeled vehicles including specified belt structure
EP0928703A1 (en) * 1997-12-29 1999-07-14 PIRELLI PNEUMATICI S.p.A. High transverse curvature tire for two-wheeled vehicles and method for its manufacture
FR2834932A1 (en) * 2002-01-23 2003-07-25 Continental Ag TIRE FOR VEHICLES, ESPECIALLY FOR MOTORCYCLES
US6953072B2 (en) 2002-01-23 2005-10-11 Continental Aktiengesellschaft Tire for vehicles, in particular for motorcycles

Also Published As

Publication number Publication date
GB2283215B (en) 1997-07-23
GB9322263D0 (en) 1993-12-15

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Legal Events

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PCNP Patent ceased through non-payment of renewal fee