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
  • B60C3/00—Tyres characterised by the transverse section
  • B60C3/08—Tyres characterised by the transverse section collapsible into storage or non-use condition, e.g. space-saving spare tyres
• • 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
  • B60C15/04—Bead cores
• • 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
  • B60C5/00—Inflatable pneumatic tyres or inner tubes
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T152/00—Resilient tires and wheels
  • Y10T152/10—Tires, resilient
  • Y10T152/10495—Pneumatic tire or inner tube
  • Y10T152/10819—Characterized by the structure of the bead portion of the tire
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49481—Wheel making
  • Y10T29/49492—Land wheel

Definitions

• the invention relates to a radial carcass or cross-carcass tire for motorized two-wheeled vehicle, motorcycle type, foldable, a folding method and use for a motorized two-wheeled motorcycle type vehicle.
• a radial carcass or cross-carcass tire for motorized two-wheeled vehicle, motorcycle type, foldable, a folding method and use for a motorized two-wheeled motorcycle type vehicle.
• “Circumferential plane” a plane perpendicular to the axis of rotation of the tire
• 'Equatorial plane' means a circumferential plane passing through the middle of the running surface of the tire and
• Ring plane a plane which contains the axis of rotation of the tire
• axial direction direction parallel to the axis of rotation of the tire
• Ring direction a direction intersecting the axis of rotation of the tire and perpendicular thereto
• Croferential direction a direction tangent to the surface of the tread in the direction of rotation of the tire, - “radially inner to”: closer to the axis of rotation of the tire,
• a tire comprises a tread intended to come into contact with the ground via a rolling surface, extending radially inwardly by two sidewalls connected to two beads intended to ensure the connection of the tire. with a rim.
• a radial carcass tire for a motorized two-wheeled vehicle comprises at least one carcass reinforcement, each end of which is anchored in a bead by turning around a circumferential reinforcing element called a bead wire, and possibly a reinforcing reinforcement comprising a crown reinforcement, radially inner to the tread.
• the crossed-carcass tire of a motorized two-wheeled vehicle differs from the radial tire of two-wheeled vehicles in that the angle of the carcass ply taken in the center of the tread is less than 65 °. .
• the rod may be formed of an assembly of elementary son or cables, themselves formed of an assembly of elementary son.
• the crown reinforcement generally comprises one to two sheets conventionally designated "top sheet". These crown plies can most often be compared to a sandwich of textile cables sandwiched between two layers of rubber.
• the thickness of the crown reinforcement essentially constituted by the radial stacking of the possible crown reinforcement and the carcass reinforcement is usually between 2 and 4 mm.
• a tire sidewall for two motorized wheels generally has a thickness of between 2 and 7 mm, when the thickness of the sidewall defines the thickness of the sidewall and that of the carcass ply.
• a packaging mode currently used consists first of all to have vertically and linearly a first row of tires forming an angle of inclination with the ground so as to partially overlap. Other tires are then incorporated and driven into the part of the port left free of each tire of the first row, thus forming a second row.
• Such a mode of packaging makes it possible to add 30% more tire per m 3 compared to a storage in which the tires are arranged side by side without deformation.
• Another storage method is to store the tires vertically and connect them in groups of five.
• the invention therefore relates to a foldable tire for a motorized two-wheeled vehicle having a carcass reinforcement optionally radially mounted on the outside of an inextensible crown reinforcement, itself radially inside a tread, said armatures each consisting of at least one layer of reinforcing elements, said tread being connected to two beads via two sidewalls, said beads being intended for come into contact with a rim, each bead comprising at least one inextensible circumferential reinforcement element, called a bead wire, said bead wire defining a middle line forming a substantially circular closed curve in a circumferential plane, said flanks having a thickness of between 2 and 7 mm and said crown reinforcement having a thickness of between 2 and 3 mm.
• the thickness of the sidewall corresponds to the cumulative thickness of the sidewall and that of the carcass ply.
• the bead of each bead is flexible.
• the tire is characterized in that after folding the tire, the average line of the rod comprises at least one concave portion P c of smaller radius Rc and center of curvature C c and in that the bead wire comprises at least one cable metal, not fretted whose carbon content is between 0.5 and 0.9%.
• This range of carbon value increases the resistance of the cable and thus reduce the number of turns of cable constituting the rod.
• a bead wire is said to be flexible when flexed in its plane around a pulley of radius 10 mm, none of the rigid elements constituting it reaches a permanent deformation.
• a crown reinforcement is inextensible when the force, to deform it by 5%, is at least 40N, and a rod is inextensible when the force, to lengthen it by 1%. is at least 2500N.
• the tire according to the invention has the advantage of being able to significantly increase the number of tires per unit volume during transport and / or storage, thus resulting in a significant economic gain.
• the folding mode according to the invention allows a tire storage with a gain of 30% per m 3 with respect in particular to the chaining type conditioning mode, explained above.
• the tire according to the invention can be folded, and stored in bulk or arranged in a box.
• Another advantage of the tire of the invention is that it can be submitted and stored in different modes of folding, regardless of its size.
• the tire according to the invention can remain folded during its transport and / or storage without any negative impact on its performance.
• Another object of the invention is a method for folding a tire as defined above, which consists in: a-spreading, in a radial plane, the beads of a first half of a tire in an axial direction to an axis tangential to the center of the tread, b- to apply a force in two radial directions, parallel and of identical direction, at two points spaced from the tread of a first half (Mi) so as to bring closer the first half (Mi) of the tread spaced from a second half (M 2 ) opposite the first half (Mi) at said two points, thus forming a first and a second approach zone, while simultaneously maintaining the tread between these two points in the form of a protuberance, c- to arrange the inner portion of said protuberance on either side of a first vertical axis, fixed and simultaneously to bear on a third axis v ertical one of said approximation areas, said first axis being arranged diametrically to a second axis, said first and
• each bead is preferably formed by winding at least one wire rope, formed of filaments, saturated and not shrunk, the diameter of the cable is preferably less than 0.22mm.
• This rod is dimensioned such that the burst pressure is greater than the capacity of automatic inflation tools whose maximum pressure is between 10 and 12bar.
• the ability to bend the cable is a function of the number of metal cables laid.
• a very high strength steel cable (between 1700N and 2200N) is used in order to reduce the number of towers laid.
• This also has the advantage of reducing the mass of the folded tires, which may in certain cases be limited by their mass (the bead wire representing between 5 and 10% of the total mass of a tire) while they are limited by the volume when transported unfolded.
• the mean line of the bead wire further comprises at least two inflection points L, I 2 delimiting the concave part P c .
• the mean line of the bead wire further comprises at least two convex portions P x i ; P x2 having two smaller radii R x i, R x2 and two centers of curvature C x i, C x2 .
• straight lines Di, D 2 respectively connecting the center of curvature C c i of the concave part P c to each of the centers of curvature C x i, C x 2 of the convex portions form an angle ⁇ of between 5 and 130 °.
• the concave portion P c is defined by a center of curvature outside the closed average line of the bead wire.
• the convex portion P x is defined by a center of curvature within the closed average line of the bead wire.
• the average line of the bead wire of each bead is preferably formed by winding a wire rope, formed of filaments.
• the diameter of the cable is preferably less than 1.5mm, and is not shrunk.
• the diameter of the filaments is preferably less than 0.22 mm.
• a cable is said to be "unfrowned” when it does not have an additional filament wound helically on the outer surface of said cable.
• a hoop filament is usually chosen with a diameter smaller than that of the filaments of the cable and is wound in a reduced pitch and in a direction opposite or identical to that of the winding of the wires forming the outer surface of the cable. The primary function of a hoop is to limit the buckling of the cable.
• the diameter of the son or filaments forming the cable is less than 0.22 mm. Such diameters of the filaments will further contribute to the flexibility of the cable and limit the forces required to fold the tire.
• An advantageous embodiment of the invention provides that the tensile modulus of the cable is greater than 150 GPa.
• the cable is foldable with a radius of curvature of between 2 and 5 mm without deformation that would make the tire unusable.
• it is foldable with a radius of curvature of less than 3 mm without presenting any deformation that would render the tire unusable.
• the cable is a metal cable with layers of construction [L + M] or [L + M + N] having a first layer C1 to L son of diameter di with L ranging 1 to 4, surrounded by at least one intermediate layer C2 to M son of diameter d 2 wound together helically in a pitch p 2 with M ranging from 3 to 12, said layer C2 possibly being surrounded by an outer layer C3 N wires of diameter d 3 wound together helically in a pitch p 3 with N ranging from 8 to 20.
• the first layer forms a central core consisting of a wire of diameter di.
• the pitch p 2 and the pitch p 3 are identical.
• the cable is a 19.20 unfrowned metal cable of formula 1.22 + 6.20 + 12.20, the layers being formed with the same direction of rotation and with identical pitch.
• Such a cable allows the formation of a rod by a winding of a first round of 1 to 4 cables or 2 to 4 turns of cables to form a first layer, and so on to form n layers.
• the number n of layers can be between 1 and 4. This number of turns / cables / layers required is a function of the size of the tire and its use.
• the average line of the rod comprises a concave portion P c of smaller radius R d and center of curvature C c i.
• the bead wire also comprises two convex portions P x i, P x 2 , respectively of smaller radii R x i, R x 2 , and centers of curvature C x i, C x 2 .
• the straight lines Di, D 2 respectively connecting the center of curvature C c i of the concave part P c to each of the centers of curvature C x i, C x 2 , of the convex part P x form an angle ⁇ of between 5 and 40 ° .
• the geometric shape of the tire folded according to this first variant substantially resembles a "U" or "J" shape, depending on whether the lines D 1 and D 2 are of the same length or of different length.
• the average line of the rod comprises a concave portion P c of smaller radius R d and center of curvature C c i.
• the bead wire comprises two convex portions P x i, P x 2 , respectively smaller radii R x i, R x 2 , and centers of curvature C x i, C x 2 .
• the lines Di, D 2 respectively connecting the center of curvature C c i of the concave part P c to each of the centers of curvature C x i, C x 2 , of the convex part P x may form an angle ⁇ of between 50 and 85 °, and are preferably of different length.
• the geometric shape of the tire folded according to this second folding variant substantially resembles a spiral shape.
• the average line of the bead wire may comprise two concave portions P c i, P c 2 respectively smaller radii R d , R c2 and centers curvature C d , C c2 .
• She also comprises two convex portions P x i, P x 2 , respectively smaller radii R x i, Rx2, and centers of curvature C x i, C x2 .
• the straight lines Di, D 2 respectively connecting the center of curvature C c i of a concave portion to each of the centers of curvature C x i, C x 2 , convex portions P x i, P x 2 preferably form an angle ⁇ between 95 ° and 130 °, and are not the same length.
• the geometric shape of the tire folded according to this latter variant substantially resembles an "S".
• the range of values of the angle a allows both to ensure that the tire, for certain dimensions, does not risk any alteration when folded for a long time, but also to provide a significant gain in compaction.
• the ratio Di / D 2 can tend to zero. It is preferably between 0.15 and 1. When folded substantially into the shape of "S", the ratio Di / D 2 can tend towards an infinite value. It is preferably between 1 and 12.
• the tire according to the invention preferably occupies after folding, a volume less than 65% per m 3 with respect to the chaining conditioning mode.
• FIG. 1 shows a schematic sectional view along a radial plane of a tire for motorized two-wheeled vehicles, unfolded
• FIG. 2 represents a schematic sectional view, along a circumferential plane, of the folded tire of the invention, according to a first embodiment
• FIG. 3 represents a schematic sectional view, along a circumferential plane, of the folded tire of the invention, according to a second embodiment
• FIG. 4 represents a schematic sectional view, according to a circumferential plane of the folded tire of the invention, according to a third embodiment
• FIG. 1 represents a lightweight motorcycle tire of general reference 1, not folded, comprising a tread 2 which extends radially inwards by two sidewalls 3 connected to two beads 4, said beads 4 comprising a bead 5 (reinforcing element).
• Said crown and carcass reinforcement 6 are each constituted by at least one layer of reinforcing elements (not shown).
• the tread 2 is connected to two beads 4 by means of two sides 3.
• Each bead 4 comprises at least one bead 5.
• the bead wire is preferably made of steel, and is in the form of a non-corded cable, formed of filaments; said filaments being of a diameter equal to 0.20mm.
• the cable is a 19.20 wire rope of formula 1.22 + 6.20 + 12.20, the layers being formed with the same direction of rotation and with identical pitch equal to 10 mm.
• Such a cable allows the formation of a rod by a winding of 3 to 16 turns. The number of turns required is a function of the size of the tire and its use.
• the average thickness E F of the sidewall (which combines that of the sidewall and that of the carcass ply) of the tire according to the invention, measured at the point in the middle in the radial direction between the top point of the rod and the low point of the tire on the equatorial plane is between 2 and 7 mm.
• the average thickness E s of the crown reinforcement (which optionally comprises a crown ply), measured at the equatorial plane, is between 2 and 5 mm.
• the average line of the rod 5 (shown in dashed lines) of the tire, of commercial reference 150 / 70-14, folded according to a first mode of folding, substantially U-shaped, has a concave portion P c i, smaller radius R d equal to 45 mm and a center of curvature C c i.
• the mean line of the bead wire 5 comprises, on the one hand, two inflection points L, I 2 which delimit the concave part P c i, and, on the other hand, two convex parts P x i ; P x2 having two smaller radii R x i between 20 and 30 mm and R x2 between 20 and 30 mm and two centers of curvature C x i and C x2 .
• Two straight lines Di and D 2 which respectively connect the center of curvature C c i of the concave part P c i to each of the centers of curvature C x i and C x 2 of the convex part P x i form an angle at about 15 °.
• the straight lines Di and D 2 are, according to this folding mode, of substantially the same length, and measure 240 mm.
• the tires After being folded according to this first mode of folding, the tires may further be nested within each other, or possibly chained. Chaining maintains their compression.
• Table I collects other measurements made on the form of folding shown in Figure 2 ("U" shape).
• the folding of the tire 1, as shown in FIG. 3, differs from that of FIG. 2 in that the straight lines Di and D 2 form an angle ⁇ of between 50 ° and 85 °, and that they do not have the same length.
• the folding as shown in Figure 4 substantially resembles the shape of a spiral.
• the volume occupied by the tire is less than 85%, preferably less than 75%> with respect to the volume occupied by the tires folded according to currently known packaging modes.
• Table II gathers the measurements made on different tires according to the form of folding shown in Figure 3 (spiral shape).
• Thickness Thickness Angle Di D 2 Rcl Rxl Rx2 D J / D Î of the flank of a in (in (in (in (in (in (in (in (in pneumatic (in mm) the armature degree) mm) mm) mm) mm) mm)
• the third mode of folding of the tire 1, as shown in Figure 4, differs from that of Figure 2 in that the average line of the rod 5 comprises two concave portions P c i, P c2 .
• the concave portions P c i and P c 2 are characterized by a smaller radius.
• the mean line of the rod 3 also comprises two convex portions ⁇ , P X 2 having respectively a smaller radius R x i of between 20 and 30 mm, and R x2 of between 20 and 30 mm, and respectively a center curvature C x i, C x2 .
• the average line of the rod 3 comprises three points of inflection L, I 2 and I 3 which delimit a concave portion of a convex portion and vice versa.
• the straight lines Di and D 2 which respectively connect the center of curvature C c i of a concave portion P c i to each of the centers of curvature C x i, C x 2 of the convex portions P x i and P x2 form an angle a between 95 ° and 130 °.
• the straight lines Di and D 2 are not of the same length.
• the volume occupied by the tire is less than 80%, preferably less than 70%> with respect to the volume occupied by the bent tires according to currently known compaction modes.
• Table III gathers the measurements made on different tires according to the form of folding shown in Figure 4 (S-shaped). Dimensions Thickness Thickness Angle Di D 2 Rcl Rxl Rx2 D J / D Î of the flank of a (in (in (in (in (in (in (in (in pneumatic (in mm) the armature degree) mm) mm) mm) mm) mm) mm)
• the folding method described below, with reference to FIGS. 5A to 5F may be envisaged.
• the beads of a first half Mi of a tire are spread apart in an axial direction towards an axis tangent to the center of the tread.
• This rotating means 11 comprises a first axis 12 and a second axis 13, both vertical, diametrically opposed, and movable.
• a fixed third vertical axis 14 is disposed at a distance d2 closest to the rotary means 11.
• the distance between the first axis 12 and the second axis 13 is preferably equal to the length of the straight line D2 defined above on the folded tire.
• the direction S of rotation of the rotary means 11 is directed towards the second vertical axis 14 as mentioned in Figures 5B to 5E.
• the inner portion 10a of the protuberance 10 is then disposed "on horseback" on either side of the first vertical axis 12.
• the inner part 9a of the zone 9 of approaching the tire simultaneously bears against the vertical axis 14.
• the second half M 2 of the tire is moreover preferably maintained by any means in the pre-folded position during the steps of folding.
• the bending process of the tire thus pre-arranged operates in the following manner.
• Figure 5C shows a rotation of a quarter turn of the rotating means 11 with respect to Figure 5B.
• this rotary means 11 is rotated in the direction S directed towards the vertical axis 14, the protuberance 10 of the tire is rotated by the first vertical axis 12.
• the zone 9 is held simultaneously against the vertical axis 14 during the entire phase of rotation.
• FIG. 5D which represents a rotation of a half-turn of the rotary means 11 with respect to FIG. 5B, shows the progressive winding of the tire on itself, the zone 9 always being held in abutment against the vertical axis 14.
• Figure 5E which shows a rotation of three quarter turn of the rotary means 11 with respect to Figure 5B, shows the evolution of the winding of the tire.
• the zone 9 is always held in abutment against the vertical axis 14.
• the second vertical axis 13 makes it possible to drive and maintain the winding movement of the tire, while remaining completely radially outside the tread 2.
• Figure 5F shows the tire completely folded. Depending on the type of folded tire, it is necessary to achieve between at least one turn of rotation of the rotary means 11 to fold it. Preferably, rotate one turn for folding according to the embodiment of FIG. 2, and at least one turn and one half for folding according to the embodiment of FIG.
• the tire may possibly be kept folded by any holding means which can be set up automatically and / or manually.

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

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Citations (1)

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• 2012
  • 2012-06-27 FR FR1256127A patent/FR2992588B1/fr active Active
• 2013
  • 2013-06-19 IN IN10481DEN2014 patent/IN2014DN10481A/en unknown
  • 2013-06-19 JP JP2015518979A patent/JP6337893B2/ja not_active Expired - Fee Related
  • 2013-06-19 ES ES13730540.5T patent/ES2621222T3/es active Active
  • 2013-06-19 WO PCT/EP2013/062698 patent/WO2014001167A1/fr not_active Ceased
  • 2013-06-19 US US14/410,284 patent/US20150183269A1/en not_active Abandoned
  • 2013-06-19 RU RU2015102294A patent/RU2015102294A/ru not_active Application Discontinuation
  • 2013-06-19 BR BR112014031447A patent/BR112014031447A8/pt not_active Application Discontinuation
  • 2013-06-19 CN CN201380033450.4A patent/CN104379366B/zh not_active Expired - Fee Related
  • 2013-06-19 EP EP13730540.5A patent/EP2867033B1/fr not_active Not-in-force

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