WO1998002320A1 - Pneu - Google Patents

Pneu Download PDF

Info

Publication number
WO1998002320A1
WO1998002320A1 PCT/GB1997/001878 GB9701878W WO9802320A1 WO 1998002320 A1 WO1998002320 A1 WO 1998002320A1 GB 9701878 W GB9701878 W GB 9701878W WO 9802320 A1 WO9802320 A1 WO 9802320A1
Authority
WO
WIPO (PCT)
Prior art keywords
tire
sidewalls
restrictor
distance
reinforcing material
Prior art date
Application number
PCT/GB1997/001878
Other languages
English (en)
Inventor
Brian Carpenter
Original Assignee
Cooper Tire & Rubber Company
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 Cooper Tire & Rubber Company filed Critical Cooper Tire & Rubber Company
Publication of WO1998002320A1 publication Critical patent/WO1998002320A1/fr

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
    • 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

Definitions

  • the present invention relates to a tire, more specifically to a tire of the type having a circumferential restrictor to resist radial distortion of the tire.
  • the invention is particularly, although not exclusively, applicable to tires for motor cycles.
  • Known restrictors generally take the form of a band of reinforcing material wrapped circumferentially around the casing of the tire and extending between the tire shoulders beneath the tread.
  • the reinforcing material used is steel or an aramid cord.
  • Fig. 1 shows an example of such a known tire construction.
  • This known tire 1 includes a tread portion 2 and sidewalls 3 formed of a vulcanised rubber and supported on a casing 4 on the interior of the tire 1. Respective beads 5 are provided to reinforce the lower edges of the sidewalls 3 and a layer of tubeless lining rubber 6 covers the inside surface of the tire 1.
  • An aramid cord 7 is wound around the outside circumference of the casing to provide a uniform band of reinforcing material extending between the tire shoulders 8. This wrap of reinforcing material helps to resist radial deformation of the tire 1 under load.
  • tire performance can be improved by varying the resistance to radial distortion of the tire provided by the restrictor across the width of the tire. This is achieved by varying the amount or type of restriction material across the tire.
  • the resistance provided by the restrictor can be optimised in relation to the differing characteristics required from the tire under different load conditions.
  • the invention may be particularly, but not exclusively, useful in the field of motor cycle tires which undergo a wide range of operating load conditions, from upright straight line running to leaned cornering.
  • the invention may also be applicable to other types of tires such as car tires.
  • the invention is applicable to both cross-ply and radial tires.
  • the present invention can provide a tire having a circumferential restrictor extending across at least a portion of the tires width to resist radial distortion of the tire, wherein the amount or type of the restrictor material varies across the tire, thereby to vary the resistance to radial distortion of the tire provided by the restrictor across the width of the tire.
  • the material of the restrictor may be in the form of one or more layers across the width of the tire, the invention is not limited to such an arrangement.
  • the restrictor may take the form of a series of spaced apart bands of reinforcing material or, more preferably, one or more helically wound cords of reinforcing material.
  • the variation across the width of the tire of the reinforcing property of the restrictor can be achieved in many different ways.
  • Examples of arrangements to provide this variation include: the use of different reinforcing materials in different regions across the width of the tire, which varies the type of material; using bands, cords or the like with varying cross sectional areas across the width of the tire (varying the amount of material) ; using multiple layers of the reinforcing material with a different number of layers in different regions across the width of the tire (varying the amount of material) ; and varying the spacing of bands, cords or the like across the width of the tire (again, varying the amount), the more densely packed these elements, the greater the resistance to distortion provided. It is also possible to use a combination of two or more of these arrangements to achieve the desired effect.
  • one particularly preferred arrangement for achieving the variation in resistance is to vary the density (i.e. spacing) of the windings across the width of the tire.
  • the variation across the width of the tire of resistance to radial distortion may be continuous or, alternatively, incremental, or a combination of the two.
  • the resistance provided, and hence the change in amount or type of material is symmetrical about the centre line of the tire and for typical applications will be greatest at the centre line and will reduce towards the sidewalls of the tire.
  • the restrictor need not extend across the whole width of the tire, from shoulder to shoulder, it is preferable that it does. Since in use, the tire will typically be revolving about its axis, it is desirable that the change in tire characteristics is limited to the lateral direction of the tire and does not change in the circumferential direction. Accordingly, it is particularly preferred that the properties of the restrictor in any one vertical plane perpendicular to the axis of rotation of the tire are for practical purposes constant, that is to say no more than about 10% variation.
  • the resistance at the edge of the restrictor is preferably 70% - 30% that at the centre line.
  • the cross-sectional area of reinforcing material in the edge portions of the restrictor may be between 30% - 70% less than that in a central portion of the tire, or the reinforcing materials can be selected so that the material used in the edge portions has an elastic modulus between 30% - 70% less than that of the material used in the central portion.
  • the density of the windings can be made between 30% - 70% less at the edge portions than it is at the central portion.
  • the desired variation in resistance may be achieved by a combination of these various factors.
  • the actual variation across the width of the tire of the resistance to radial distortion can be selected for a particular application with a view to the loading that the tire is likely to undergo.
  • a reduction in resistance between the centre line of the tire and respective edges of 50% is, however, thought to provide a good all round performance improvement over conventional tires.
  • the resistance may reduce to zero at the tire shoulder, or even at a point spaced inwardly from the shoulder.
  • a variation of less than 10% i.e. the resistance at the edge of the restrictor being more than 90% of that at the centre line
  • any suitable material may be used as the material of the restrictor, for example any of the standard cords used for known restrictors would suffice, and steel, glass fibre, rayon and polyamide fibre (e.g. KEVLAR or TWARON) are also possibilities.
  • Fig. 1 shows schematically a cross-section of a known tire construction
  • Fig. 2 shows schematically a cross-section of a tire according to an embodiment of the present invention.
  • Fig. 3 is a part of Fig. 2 on an enlarged scale.
  • Fig. 2 shows in cross-section one half of a tire 10 according to an embodiment of the present invention. It should be noted that the tire 10 is symmetrical about its centre line A and a description of the other half of the tire is therefore unnecessary.
  • the tire 10 of Fig. 2 includes a tread portion 12 having the desired tread pattern formed therein, and having respective sidewalls 13 depending from opposite ends thereof, the region at the junction between the tread portion 12 and the sidewall 13 being termed the "shoulder" 14 of the tire 10.
  • the tread portion 12 and sidewalls 13 are formed of vulcanised rubber as is known.
  • a casing 15 underlies the tread portion 12 and sidewalls 13 and beads 16 are provided to reinforce the lower edge of each sidewall 13 in the conventional way, these beads 16 being held in place by a filler 17.
  • the inside surface of the tire 10 is lined with a tubeless lining rubber 18.
  • a restrictor 19 in the form of a helically wound cord, is wrapped around the casing 15 beneath the tread portion 12, to increase resistance to radial deformation of the tire 10 under load.
  • the restrictor 19 extends from one shoulder 14 of the tire 10 to the other shoulder, but in contrast to the prior art arrangements, the spacing of the windings of the restrictor 19, and hence the resistance to radial deformation, is not constant across the width of the tire 10.
  • Fig. 3 which shows part of the tread portion 12 and the underlying structure of the tire on an enlarged scale
  • the windings 19a towards the centre line of the tire 10 are denser (i.e. more closely spaced) than the windings 19b towards edge of the restrictor at the shoulder 14.
  • the variation in the spacing between the inner windings 19a and the outer windings 19b can be selected to provide the desired variation in resistance to radial distortion of the tire across its width for instance to optimise the performance of a motor cycle tire in relation to the different loads it experiences between upright straight line running and leaned cornering.
  • the density of the windings 19a at the central portion of the tire is about 60 ends per decimeter and this density reduces to a value of about 30 ends per decimeter for the windings 19b at the edge of the restrictor, in the shoulder region 14 of the tire.
  • This 50% reduction in winding density between the centre line and the edge of the restrictor at the shoulder 14 of the tire 10 has been found to give an improvement in performance over the known arrangement having a constant winding density across the width of the tire. Improvements have also been found with 70 ends per decimeter at the centre line and 40 ends per decimeter at the edge of the restrictor (i.e. about 40% reduction)
  • the spacing of the windings of the restrictor 19 reduces gradually from its edge at respective shoulders 14 towards the centre line of the tire 10. It is possible however to reduce the spacing of the windings in a stepped manner.
  • the method of production of the tire shown in Figs. 2 and 3 can be very similar to the known manufacturing process.
  • the only necessary change to this conventional process is in the step of winding the cord around the tire casing 15, in the tire of Figs. 2 and 3 the spacing of the windings being varied during the winding process, rather than being kept constant .
  • This can be achieved using the conventional apparatus, for example, by manually controlling the pitch of the windings and the rotation of the tire casing as the cord is wound around it.

Landscapes

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

Abstract

L'invention porte sur un pneu (10) ayant une bande de roulement (12), une paroi latérale (13) de chaque côté de la bande de roulement (12), une carcasse (15) portant les parois latérales (13) et la bande de roulement (12). Le pneu comporte aussi un restricteur circulaire (19) sur la circonférence extérieure de la carcasse (15). Le restricteur circulaire (19) s'étend sur au moins une partie de la distance qui sépare les parois latérales (13) et résiste à la distortion radiale du pneu (16). Le matériau constituant le restricteur circulaire (19) varie en quantité ou en nature sur la largeur du pneu, pour opposer une résistance variable à la distortion radiale du pneu. Le restricteur circulaire (19) peut être un câblé d'un matériau de renforcement enroulé en hélice autour de la circonférence extérieure de la carcasse. La résistance variable à la distortion radiale peut résulter de l'espacement inégal entre les enroulements du câblé sur la distance qui sépare les parois latérales. La résistance à la déformation radiale sur les bords du restricteur circulaire est de 30 % à 70 % par rapport à la résistance à la déformation radiale sur le plan de roulement entre les parois latérales (13).
PCT/GB1997/001878 1996-07-12 1997-07-11 Pneu WO1998002320A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9614716.0 1996-07-12
GBGB9614716.0A GB9614716D0 (en) 1996-07-12 1996-07-12 Tyre

Publications (1)

Publication Number Publication Date
WO1998002320A1 true WO1998002320A1 (fr) 1998-01-22

Family

ID=10796834

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/001878 WO1998002320A1 (fr) 1996-07-12 1997-07-11 Pneu

Country Status (2)

Country Link
GB (1) GB9614716D0 (fr)
WO (1) WO1998002320A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003095242A1 (fr) 2002-05-10 2003-11-20 Societe De Technologie Michelin Pneumatique pour deux roues
JPWO2006008876A1 (ja) * 2004-07-16 2008-05-01 株式会社ブリヂストン 二輪自動車用タイヤ
FR2939723A1 (fr) * 2008-12-17 2010-06-18 Michelin Soc Tech Pneumatique pour vehicules comportant une couche d'elements de renforcement circonferentiels
JP2016141209A (ja) * 2015-01-30 2016-08-08 株式会社ブリヂストン 自動二輪車用空気入りタイヤ
CN111251786A (zh) * 2020-03-17 2020-06-09 中策橡胶集团有限公司 一种0度可变缠绕密度带束层的摩托车或电动车轮胎

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR792853A (fr) * 1934-07-23 1936-01-11 Matador Gummiwerke Ag Bandage pneumatique pour véhicules et analogues
DE1012838B (de) * 1956-05-18 1957-07-25 Phoenix Gummiwerke Ag Kraftfahrzeugluftreifen mit in drei Richtungen liegenden Einlagen
DE2829452A1 (de) * 1978-07-05 1980-01-17 Euteco Spa Reifen
EP0455453A2 (fr) * 1990-05-02 1991-11-06 Sumitomo Rubber Industries Limited Pneumatique radial pour motos
EP0540202A1 (fr) * 1991-10-14 1993-05-05 Sumitomo Rubber Industries Limited Pneumatique pour motocyclettes
EP0565339A1 (fr) * 1992-04-06 1993-10-13 Sumitomo Rubber Industries Limited Bandage pneumatique pour moto
JPH05319019A (ja) * 1992-05-25 1993-12-03 Sumitomo Rubber Ind Ltd 自動二輪車用ラジアルタイヤ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR792853A (fr) * 1934-07-23 1936-01-11 Matador Gummiwerke Ag Bandage pneumatique pour véhicules et analogues
DE1012838B (de) * 1956-05-18 1957-07-25 Phoenix Gummiwerke Ag Kraftfahrzeugluftreifen mit in drei Richtungen liegenden Einlagen
DE2829452A1 (de) * 1978-07-05 1980-01-17 Euteco Spa Reifen
EP0455453A2 (fr) * 1990-05-02 1991-11-06 Sumitomo Rubber Industries Limited Pneumatique radial pour motos
EP0540202A1 (fr) * 1991-10-14 1993-05-05 Sumitomo Rubber Industries Limited Pneumatique pour motocyclettes
EP0565339A1 (fr) * 1992-04-06 1993-10-13 Sumitomo Rubber Industries Limited Bandage pneumatique pour moto
JPH05319019A (ja) * 1992-05-25 1993-12-03 Sumitomo Rubber Ind Ltd 自動二輪車用ラジアルタイヤ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 133 (M - 1571) 4 March 1994 (1994-03-04) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003095242A1 (fr) 2002-05-10 2003-11-20 Societe De Technologie Michelin Pneumatique pour deux roues
US6994138B2 (en) 2002-05-10 2006-02-07 Michelin Recherche Et Technique S.A. Tire for two-wheeled vehicle
CN1652950B (zh) * 2002-05-10 2011-09-14 米其林技术公司 两轮车辆的轮胎
JPWO2006008876A1 (ja) * 2004-07-16 2008-05-01 株式会社ブリヂストン 二輪自動車用タイヤ
JP4558733B2 (ja) * 2004-07-16 2010-10-06 株式会社ブリヂストン 二輪自動車用タイヤ
FR2939723A1 (fr) * 2008-12-17 2010-06-18 Michelin Soc Tech Pneumatique pour vehicules comportant une couche d'elements de renforcement circonferentiels
WO2010069887A1 (fr) * 2008-12-17 2010-06-24 Societe De Technologie Michelin Pneumatique pour vehicules comportant une couche d'elements de renforcement circonferentiels
US9902205B2 (en) 2008-12-17 2018-02-27 Compagnie Generale Des Etablissements Michelin Vehicle tire comprising a layer of circumferential reinforcing elements
JP2016141209A (ja) * 2015-01-30 2016-08-08 株式会社ブリヂストン 自動二輪車用空気入りタイヤ
CN111251786A (zh) * 2020-03-17 2020-06-09 中策橡胶集团有限公司 一种0度可变缠绕密度带束层的摩托车或电动车轮胎

Also Published As

Publication number Publication date
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