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
  • B60C25/00—Apparatus or tools adapted for mounting, removing or inspecting tyres
  • B60C25/14—Apparatus or tools for spreading or locating tyre beads

Definitions

• the invention relates to a foldable tire, a folding method and a use for a passenger vehicle.
• 'Equatorial plane' means a circumferential plane passing through the middle of the running surface of the tire and
• Axial plane a plane which contains the axis of rotation of the tire
• Croferential direction a direction tangent to the surface of the tread in the direction 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 tire more particularly comprises a reinforcing reinforcement comprising a crown reinforcement, radially inner to the reinforcement strip. rolling, and a radial carcass reinforcement, radially inside the crown reinforcement.
• the carcass reinforcement usually comprises at least one layer of reinforcing elements consisting of wires substantially parallel to each other and usually forming, with the circumferential direction, an angle of between 85 ° and 95 °.
• the carcass reinforcement winds in most of the tires in each bead from the inside to the outside of the tire, around a circumferential reinforcing element, called a bead wire, to form a reversal.
• 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 several layers of crown reinforcement. These layers are most often made of metal reinforcing elements embedded in an elastomeric material.
• the thickness of the crown reinforcement essentially constituted by the radial stacking of the crown reinforcement and the carcass reinforcement is usually between 2. and 7mm.
• a tire sidewall for a passenger vehicle generally has a thickness of between 2.6 and 7 mm.
• the cross-carcass tire is distinguished from a radial technology tire by the presence of at least two crossed carcass plies whose angle is different from 90 ° with respect to the circumferential direction of the tire.
• Tablecloths are said to be “crossed” because the angles are of opposite signs from one tablecloth to another.
• WO10 / 100088 a foldable tire for a bicycle comprising a carcass reinforcement, each end is anchored in two beads by turning around a reinforcing member, called rod. Each bead is extended radially by flanks joining a tread.
• This pneumatic device comprises a rod formed by winding a saturated and unfrowned metal cable formed of filaments.
• a foldable tire mounted on rim, for vehicles, such as automobiles.
• This tire comprises a substantially annular tread centrally located, and sidewalls extending the tread and ending in inextensible beads, that is to say whose bead has a high circumferential rigidity.
• the sidewalls When the tire is deflated, the sidewalls may be folded inwardly toward each other so as to be substantially flattened within the tire with respect to the tread.
• a mode of packaging 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% of tire per m 3 in addition to a storage in which the tires are arranged side by side without deformation.
• the invention relates to a foldable tire for a vehicle comprising at least one carcass reinforcement possibly associated with an inextensible crown reinforcement, itself radially inside a tread, said reinforcement being each constituted at least one layer of reinforcing elements, said tread being connected to two bead by means of two sidewalls, said beads being intended to come into contact with a rim, each bead comprising at least one reinforcing element circumferential inextensible, called rod, said rod defining an average line forming a substantially circular closed curve in a circumferential plane, said flanks having a thickness between 2.6 and 7 mm and said crown reinforcement having a thickness between 2 and 7mm.
• the tire is characterized in that the bead of each bead is flexible, and in that after bending of the tire the average line of the bead wire simultaneously defines a first bend defined in the equatorial plane having a first pitch of a helix.
• 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 equal to 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 method of the invention enables a pneumatic storage with a gain of 30 to 50% per m 3 relative including chaining type of packaging 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 kept folded, regardless of its size. Finally, 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 in the form of a tendril, as defined above, which consists in: simultaneously grasping the tire at a first and a second end of an axis passing through the diameter of the tire, and making, according to said axis, a first rotation having a first angle of rotation of the first end and, optionally, performing a second rotation having a second angle of rotation of the second end, said rotations being done in opposite directions, either hold the second end fixed.
• the absolute value of the addition of the first angle and the possible second angle of rotation is preferably between 300 ° and 360 °. This is equivalent to a variation between 5/6 and 6/6 of the first and / or second helix pitch.
• the first and second helical pitch of said first and second curvatures are identical or different.
• the first and second propeller pitch may be between 75 and 125% of the tire diameter. These percentage values are preferably obtained at the average line of the bead wire.
• the tire according to the invention comprises a holding means in the folded position.
• the folding method is to further apply at least one holding means in the folded position, which is preferably applied to the center of the tire.
• This means can be constituted by a strap or a strapping strap.
• FIG. 1 represents a schematic three-dimensional view of an unfolded tire
• FIG. 2 represents a schematic three-dimensional view of a tire whose folding has been initiated
• Figure 3 shows a schematic three-dimensional view of a folded tire
• FIG. 4 represents a schematic view of a folded tire according to FIG. 3 with different axial planes perpendicular to the axis XX ', and
• FIG. 5 represents a schematic view of the two-dimensional space requirement of a folded tire according to FIG.
• FIG. 1 represents a passenger vehicle tire of general reference 1, not folded, comprising a tread 2 which extends radially inwards by two flanks 3 connected to two beads 4, said beads 4 comprising a bead wire (reinforcing element) (not shown).
• a bead wire Radially inside said tread 2 are successively an inextensible crown reinforcement and a carcass reinforcement (not shown).
• Each bead 4 comprises at least one bead wire.
• This rod which defines a mean line forming a substantially circular closed curve in a circumferential plane, is inextensible and flexible.
• the bead wire is preferably made of steel, and is in the form of a saturated cable and not fretted, formed of filaments; said filaments being of a diameter equal to 0.18mm.
• the cable is a 19.18 metal cable of formula (1 + 6 + 12), 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 of the tire according to the invention measured at the point situated in the middle in the radial direction between the high point of the bead wire and the low point of the tire on the equatorial plane, is between 2.6 and 7mm.
• the average thickness E s of the crown reinforcement 4, measured at the equatorial plane, is between 2 and 7 mm.
• Figure 2 shows a tire, for example commercial reference 185/65 R 14, the folding was initiated, and Figure 3 shows the same tire after folding.
• the folding of the tire is carried out by first grasping two ends, comprising a portion of the tread 2 and a portion of the sidewalls 3, said ends being diametrically opposite and located on the axis XX ', said corresponding axis XX' to the tire diameter and passing through its center. Two rotations are then made, in opposite directions, at these two points around said axis XX '.
• the first rotation has a first angle and the second rotation has a second angle.
• the addition of the absolute values of the first and second angles is preferably 300 °.
• the average line of the rod (reinforcing element) present in the bead 4 then simultaneously defines a first curvature, of general reference 5 defined in the equatorial plane, with a first pitch of 61cm rotating propeller in the triginometric direction in the axial plane, and a second curvature, of general reference 6 defined in the equatorial plane, with a second helical pitch of 65 cm rotating in the antitriginometric direction in the axial plane.
• the axial planes A and C are, respectively, substantially disposed at the first curvature 5 and the second curvature 6, and are perpendicular to the axis XX '.
• the axial plane B, perpendicular to the axis XX ', is substantially disposed at the level of the third curvature 7.
• each of the axial planes A, B and C makes it possible to define a two-dimensional space of the tire after its folding according to the invention.
• This size is defined by projecting on each axial plane A, B and C the entire corresponding footprint at the location of said plane of the folded tire. From these impressions are extracted only all the convex parts relating to the folded tire.
• Figure 5 shows the two-dimensional space of all the convex portions extracted and projected on each axial plane A, B and C of the folded tire. As can be seen in this figure, this size has a substantially rectangular shape.

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

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (9)

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Citations (4)

Family Cites Families (15)

• 2012
  • 2012-05-24 FR FR1254735A patent/FR2990897B1/fr not_active Expired - Fee Related
• 2013
  • 2013-05-15 WO PCT/EP2013/060008 patent/WO2013174687A1/fr not_active Ceased
  • 2013-05-15 JP JP2015513091A patent/JP6261013B2/ja not_active Expired - Fee Related
  • 2013-05-15 CN CN201380026371.0A patent/CN104321203B/zh not_active Expired - Fee Related
  • 2013-05-15 RU RU2014152269A patent/RU2014152269A/ru unknown
  • 2013-05-15 US US14/402,785 patent/US9889704B2/en not_active Expired - Fee Related
  • 2013-05-15 EP EP13723116.3A patent/EP2855168B1/fr not_active Not-in-force
  • 2013-05-15 BR BR112014029292A patent/BR112014029292A2/pt not_active Application Discontinuation
  • 2013-05-15 IN IN9566DEN2014 patent/IN2014DN09566A/en unknown

Patent Citations (4)

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