WO2002094583A1 - Pneumatique avec rigidite laterale optimisee - Google Patents
Pneumatique avec rigidite laterale optimisee Download PDFInfo
- Publication number
- WO2002094583A1 WO2002094583A1 PCT/EP2002/005478 EP0205478W WO02094583A1 WO 2002094583 A1 WO2002094583 A1 WO 2002094583A1 EP 0205478 W EP0205478 W EP 0205478W WO 02094583 A1 WO02094583 A1 WO 02094583A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- anchoring
- zone
- rubber
- mixture
- tire
- Prior art date
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
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
- B60C15/0018—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion not folded around the bead core, e.g. floating or down ply
-
- 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
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
-
- 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
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/02—Seating or securing beads on rims
- B60C15/024—Bead contour, e.g. lips, grooves, or ribs
-
- 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
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
-
- 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
- B60C9/02—Carcasses
- B60C9/04—Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship
- B60C9/08—Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship the cords extend transversely from bead to bead, i.e. radial ply
- B60C9/09—Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship the cords extend transversely from bead to bead, i.e. radial ply combined with other carcass plies having cords extending diagonally from bead to bead, i.e. combined radial ply and bias angle ply
Definitions
- the present invention relates to tires. More particularly, it relates to a tire comprising wire windings in the sidewalls.
- the carcass reinforcement of tires is currently constituted by one or more plies, most often radial, turned around around one or more bead wires arranged in the beads.
- the beads constitute the means for fixing the tire on the rim.
- the rigidity of the bead thus formed is very great.
- the inverted portion of the carcass, most often returned axially and radially outward, provides a protective effect against the most diverse external impacts and stresses that the tire is liable to undergo in current use.
- the height, or radial distance, of this reversal is limited, which limits the protection to a restricted area.
- the invention provides a tire comprising at least one carcass-type reinforcement structure anchored on each side of the tire in a bead, the base of which is intended to be mounted on a rim seat, each bead extending radially outwards by a sidewall, the sides joining radially outward a tread, the carcass-type reinforcement structure extending circumferentially from the bead towards said flank, a crown reinforcement, each of the beadings furthermore comprising a main anchoring zone allowing the maintenance of the reinforcing structure and comprising a plurality of circumferential wire windings cooperating with the adjacent portion of structure reinforcement by means of a rubber anchoring mixture, said tire also comprising at least one secondary anchoring zone disposed radially outside said main anchoring zone and comprising a plurality of circumferential wire windings cooperating with the portion reinforcement structure adjacent via a m lange anchoring rubber.
- Such an architecture contributes to the separation of rigidities. It is therefore possible, in this way, to increase the transverse rigidity while keeping the radial rigidity substantially unchanged.
- the rubber mixture of the secondary anchoring zone is similar to that of the main anchoring zone.
- the design and manufacture of the tire are thus simplified. Homogeneity of certain properties is also obtained.
- At least one of the anchoring zones comprises or generally consists of a rubber mixture of high modulus of elasticity.
- This mixture can for example be provided on one side of the wire alignments.
- a high modulus contributes to ensuring optimal anchoring.
- the modulus of elasticity of such a mixture can reach or even exceed 15 Mpa, and even in certain cases reach, or even exceed 40 Mpa.
- the rubber anchoring mixture extends along the reinforcing structure from the primary anchoring zone to the secondary anchoring zone.
- the wire alignments of the secondary zone are advantageously similar in nature to those of the primary zone.
- the secondary zone comprises several types of son. They may be metallic, textile or hybrid type threads.
- the tire comprises a rim protector provided with a rubber spout extending axially outwardly with respect to the sidewall, at least a portion of said secondary anchoring zone being substantially aligned radially with said rim protector.
- the rim protector provides a fulcrum extending axially beyond the rim: in the event of impact or friction against an aggressive element such as a sidewalk, the rim protector avoids contact with the rim.
- a slight deterioration of the rim protector such as a scratch or scratch, is generally not very visible, and especially without any impact on the durability of the tire, than a deterioration of the rim which would often be more easily visible.
- the presence of the secondary anchoring zone contributes to stiffening the rim protector, increasing its robustness and durability.
- An alignment can include one or more wires.
- the wire alignments can also be arranged and fabricated in several ways.
- an alignment can advantageously consist of a single wire wound (substantially at zero degrees) in a spiral over several turns, preferably from the smallest diameter to the largest diameter. It can also be made up of several concentric wires placed one inside the other, so that rings of progressively increasing diameters are superimposed. It is not necessary to add a rubber mixture to ensure the impregnation of the wire or circumferential windings of wire.
- the wires can also be discontinuous along the circumferential course.
- certain wires are of the substantially elastic type.
- the elastic threads are preferably arranged in the radially outer portion of the mechanical connection means.
- This type of wire provides a behavior adapted to possible compression zones which are liable to form during operation, for example when the flank is pushed inwards.
- Part or all of the yarns in the alignment are advantageously non-metallic, and preferably of the textile type, such as yarns based on aramid, aromatic polyester, or other types of yarns with lower modules such yarns based on PET, nylon, rayon, etc.
- These wires advantageously have a lower elastic modulus than that of the metal wires of the anchoring zone.
- the wire alignments are arranged so as to be in contact with at least one mixture of high modulus rubber.
- the alignments are surrounded on a first side by a first mixture and on the other side by a second mixture.
- the alignments are arranged on one side of the tire. It is then preferably on the outside, intended to be mounted towards the outside of the vehicle.
- the structure remains simple and therefore less expensive than with alignments on both sides, while providing effective protection for the most stressed side. All the details of construction are given in the description which follows, supplemented by FIGS. 1 to 8 where:
- FIG. 1 is a radial section essentially showing a sidewall and a bead of a first embodiment of a tire according to the invention
- Figure 2 is a radial section essentially showing a sidewall and a bead of a variant of the embodiment of Figure 1;
- FIG. 3 is a radial section essentially showing a sidewall and a bead of a second embodiment of a tire according to the invention
- Figure 4 is a radial section essentially showing a sidewall and a bead of a variant of the example of Figure 3;
- FIG. 5 is a radial section essentially showing a sidewall and a bead of a third embodiment of a tire according to the invention.
- FIG. 6 is a radial section essentially showing a sidewall and a bead of a fourth embodiment of a tire according to the invention.
- Figure 7 is a radial section essentially showing a sidewall and a bead of a variant of the embodiment of Figure 6;
- FIG. 8 is a radial section essentially showing a sidewall and a bead of a fifth embodiment of a tire according to the invention.
- thread generally designates both monofilaments and multifilaments, or assemblies such as cables, twists or even any equivalent type of assembly, and this, whatever the material and the treatment of these threads, for example surface treatment or coating or pre-sizing to promote adhesion to the rubber.
- a carcass-type reinforcing or reinforcing structure will be said to be radial when its wires are arranged at 90 °, but also, according to the terminology in use, at an angle close to 90 °.
- the characteristics of the wire mean, for example, its dimensions, its composition, its mechanical characteristics and properties (in particular the module), its chemical characteristics and properties, etc.
- FIG. 1 illustrates the lower zone, in particular the bead 1 of a first embodiment of the tire according to the invention.
- the bead 1 has an axially external portion 2 provided and shaped so as to be placed against the rim of a rim.
- the upper or radially external portion of the portion 2 forms a portion 5 adapted to the rim hook. This portion is often curved axially outwards, as illustrated in FIGS. 1 and 2.
- the portion 2 ends radially and axially inwards by a bead seat 4, adapted to be placed against a rim seat.
- the bead also comprises an axially internal portion 3, extending substantially radially from the seat 4 towards the sidewall 6.
- the tire also includes a reinforcement 10 or carcass-type reinforcement structure provided with reinforcements advantageously configured in a substantially radial arrangement.
- This structure can be arranged continuously from one bead to the other, passing through the sidewalls and the top of the tire, or it can comprise two or more parts, arranged for example along the sidewalls, without covering the entire summit.
- These wires are preferably metallic, and possibly brass-plated. In each stack, the wires are advantageously substantially concentric and superimposed.
- a laminated composite bead is produced inside the bead 1, between the wire alignments of the reinforcing structure, the wires 21 are arranged circumferentially. These are arranged in a stack 22 as in the figures, or in several adjacent stacks, or in bundles, or in any suitable arrangement, depending on the type of tire and / or the characteristics sought.
- the radially internal end portions of the reinforcing structure 10 cooperate with the wire windings. This creates an anchoring of these portions in said beads.
- the space between the circumferential wires and the reinforcing structure is occupied by a rubber mixture 60 for bonding or anchoring.
- a rubber mixture 60 for bonding or anchoring.
- the modulus of elasticity of such a mixture can reach or even exceed 15 Mpa, and even in certain cases reach, or even exceed 40 Mpa.
- a stack can advantageously consist of a single wire wound (substantially at zero degrees) in a spiral over several turns, preferably from the smallest diameter to the largest diameter.
- a stack can also be made up of several concentric wires placed one inside the other, so that rings of progressively increasing diameter are superimposed. It is not necessary to add a rubber mixture to ensure the impregnation of the reinforcing wire, or circumferential windings of wire.
- the bead on each side of the reinforcement structure, comprises an arrangement of anchoring wires constituted by stacks of wires juxtaposed and arranged on either side of the reinforcement structure 10. They are advantageously arranged in the immediate vicinity of the reinforcing structure.
- the structure illustrated in Figure 1 is particularly simplified and simple to produce. Certain forces from the reinforcing structure are transmitted to the windings at zero degrees via the mixture 60.
- a zone 25 of protective mixture, the modulus of elasticity of which is lower than that of the mixture of the anchoring zone, is advantageously provided along the external contour of the bead, for example in order to promote contact with the rim and protect the anchoring area.
- the tire also has a secondary anchoring zone 30.
- the secondary anchoring zone takes the form of one or more wired alignments or alignments of reinforcing wires 31.
- the arrangement of wires 31 is arranged in the axially external portion 2 of the bead, along the reinforcement structure 10.
- the arrangement can advantageously consist of a single wound wire (substantially zero degrees) in a spiral, preferably from the smallest diameter to the largest diameter.
- a pile can also consist of several concentric wires laid one inside the other.
- the arrangement 30 of wires 31 can extend substantially radially along the sidewall or a portion of it.
- the number of windings, the radial spacing, and the radial position of the arrangement can vary according to an infinite number of possibilities. These characteristics are defined as a function of the qualities sought at the level of the tire, such as rigidity, resistance to wear, endurance, etc.
- the arrangement 30 of wires 31 extends substantially radially from the base of the reinforcement structure 10.
- the wires are preferably metallic.
- Various variants advantageously provide for yarns of a textile nature, such as, for example, aramid, nylon, PET, PEN, or hybrid.
- FIG. 2 illustrates a variant of the embodiment illustrated in FIG. 1. This variant differs in that the secondary anchoring zone 30 and the main anchoring zone 20 extend towards each other by so as to form a substantially continuous zone extending from the bead towards the side.
- FIGS. 3 and 4 represent another embodiment in which the secondary anchoring zone 30 comprises wires or wire windings of which at least one characteristic differs from those of the main anchoring zone 20. It may be the wire diameter, type of material, or characteristics of the winding itself, such as the pitch or spacing between the wires.
- the windings also extend from the main anchoring zone, to the secondary area. At the bead, the wires 31 are juxtaposed with the wires 21 of the main anchoring zone.
- FIG. 4 illustrates a variant in which the wire windings 31 extend radially outwardly beyond the rubber mixing zone of anchoring 60, as for example in a side mixing zone 62.
- FIG. 5 illustrates another embodiment in which the wire windings 31 cooperate only partially with the rubber anchoring or connecting mixture 60.
- the wires are arranged immediately adjacent to the mixture 60 so that that at least a portion of the profile of at least part of the windings cooperates with this mixture.
- FIG. 6 illustrates another embodiment, very similar to the example of FIG. 1, but also comprising a rim protector 70.
- the latter consists of a circumferential strip axially external to the sidewall and situated substantially radially external to the bead 1
- This rim protector plays a protective role by preventing any contact between the rim disposed on this same wheel and any external object or obstacle liable to damage said rim. It is a very useful element for vehicles fitted with alloy rims such as aluminum. They also greatly contribute to the visual aspect of the vehicle.
- the secondary anchoring zone is at least partially aligned radially with the rim protector of the tire.
- FIG. 7 differs from FIG. 4 by the fact that the sidewall includes a rim protector 70, similar to that previously described in FIG. 6.
- FIG. 8 illustrates an exemplary embodiment similar to that of FIG. 3, but with two substantially neighboring reinforcement structures 10. Furthermore, the flank is provided with a second series of wire windings 31 which may be of the same type or different from neighboring wires. In this example, the wires of this second series are provided in a mixing zone with a lower modulus of elasticity than that of zone 60.
- the mixtures used in zones 20 and 30 may or may not be identical.
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- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR01/07201 | 2001-05-21 | ||
FR0107201 | 2001-05-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002094583A1 true WO2002094583A1 (fr) | 2002-11-28 |
Family
ID=8863864
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/005478 WO2002094583A1 (fr) | 2001-05-21 | 2002-05-17 | Pneumatique avec rigidite laterale optimisee |
Country Status (1)
Country | Link |
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WO (1) | WO2002094583A1 (fr) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2055988A5 (fr) * | 1969-08-14 | 1971-05-14 | Dunlop Ltd | |
US5660656A (en) * | 1992-08-05 | 1997-08-26 | Sedepro | Tire with anchored carcass |
WO2000026043A1 (fr) * | 1998-10-30 | 2000-05-11 | Pirelli Pneumatici S.P.A. | Structure de carcasse pour pneumatiques de roues de vehicule et son procede de fabrication |
WO2001036219A1 (fr) * | 1999-11-18 | 2001-05-25 | Société de Technologie Michelin | Pneumatique avec zone basse comportant une concentration de fils |
-
2002
- 2002-05-17 WO PCT/EP2002/005478 patent/WO2002094583A1/fr not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2055988A5 (fr) * | 1969-08-14 | 1971-05-14 | Dunlop Ltd | |
US5660656A (en) * | 1992-08-05 | 1997-08-26 | Sedepro | Tire with anchored carcass |
WO2000026043A1 (fr) * | 1998-10-30 | 2000-05-11 | Pirelli Pneumatici S.P.A. | Structure de carcasse pour pneumatiques de roues de vehicule et son procede de fabrication |
WO2001036219A1 (fr) * | 1999-11-18 | 2001-05-25 | Société de Technologie Michelin | Pneumatique avec zone basse comportant une concentration de fils |
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