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
  • B60C15/02—Seating or securing beads on rims
  • B60C15/0209—Supplementary means for securing the bead
  • B60C15/023—Supplementary means for securing the bead the bead being secured by bead extensions which extend over and wrap around the rim flange
• • 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
  • B60C15/0209—Supplementary means for securing the bead
  • B60C15/0213—Supplementary means for securing the bead the bead being clamped by rings, cables, rim flanges or other parts of the rim
• • 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
  • B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
  • B60C17/01—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional inflatable supports which become load-supporting in emergency
• • 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
  • B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
  • B60C5/16—Sealing means between beads and rims, e.g. bands
• • 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
  • Y10T152/10855—Characterized by the carcass, carcass material, or physical arrangement of the carcass materials
  • Y10T152/10864—Sidewall stiffening or reinforcing means other than main carcass plies or foldups thereof about beads

Definitions

• the present invention relates to a mounted assembly comprising a rim and a tire, intended to equip a heavy vehicle or civil engineering type, said tire comprising at least one carcass reinforcement radially surmounted by a tread.
• the invention also relates to a tire and to a method for limiting the bending of the sidewalls of such a tire.
• the invention will be more particularly described with reference to tires for vehicle of the dumper type and having an axial width greater than 37 inches.
• the reinforcement or reinforcement of tires and in particular of civil engineering tires is currently - and most often - constituted by stacking one or more plies conventionally designated "carcass plies", "plies summit ", etc.
• This way of designating the reinforcing reinforcements comes from the manufacturing process, consisting in producing a series of semi-finished products in the form of plies, provided with often longitudinal wire reinforcements, which are then assembled or stacked in order to make a blank of pneumatic.
• the sheets are made flat, with large dimensions, and are then cut according to the dimensions of a given product.
• the plies are also assembled, initially, substantially flat.
• the blank thus produced is then shaped to adopt the toroidal profile typical of tires.
• the semi-finished products called "finishing" are then applied to the blank, to obtain a product ready for vulcanization.
• Such a “conventional” type of process involves, in particular for the manufacturing phase of the tire blank, the use of an anchoring element (generally a bead wire), used to anchor or maintain the frame of carcass in the tire bead area.
• an anchoring element generally a bead wire
• a portion of all the plies making up the carcass reinforcement is turned around a bead wire disposed in the bead of the tire. This creates an anchoring of the carcass reinforcement in the bead.
• the reinforcing elements of the various reinforcing structures are applied directly to the adjacent layers of rubber mixtures, the whole being applied in successive layers to a toroidal core whose shape allows a profile similar to the profile to be obtained directly. end of the tire during manufacture.
• a toroidal core whose shape allows a profile similar to the profile to be obtained directly. end of the tire during manufacture.
• the basic products such as rubber mixes and reinforcing elements in the form of threads or filaments are applied directly to the core.
• This core being of toroidal shape, we no longer have to form the blank to pass from a flat profile to a profile in the form of a torus.
• the tires described in this document do not have the "traditional" reversal of the carcass ply around a bead wire.
• This type of anchoring is replaced by an arrangement in which there is disposed adjacent to said flank reinforcement structure of the circumferential wires, the whole being embedded in a rubbery mixture of anchoring or binding.
• assembly processes on a toroidal core using semi-finished products specially adapted for rapid, efficient and simple installation on a central core.
• a composite comprising both certain semi-finished products to achieve certain architectural aspects (such as tablecloths, rods, etc.), while others are made from the direct application of mixtures and / or reinforcing elements.
• the conventional terms such as “tablecloths”, “rods”, etc.
• the term “carcass-type reinforcement” or “sidewall reinforcement” is valid for designating the reinforcing elements of a carcass ply in the conventional process, and the corresponding reinforcing elements, generally applied at the sidewalls, d 'a, tire produced using a semi-finished process.
• the term “anchoring zone” for its part, can designate just as much the "traditional" turning of the carcass ply around a rod of a conventional process, as the assembly formed by the circumferential reinforcing elements, the rubbery mixture and the adjacent flank reinforcement portions of a lower zone produced with a method with application to a toroidal core.
• the carcass reinforcement, anchored in each bead is composed of at least one layer of metallic reinforcing elements, the said elements being substantially parallel to each other in the layer and may be substantially radial.
• the carcass reinforcement is usually surmounted by a crown reinforcement composed of at least two working crown layers of metallic reinforcing elements, but crossed from one layer to the next, making angles with the circumferential direction.
• the crown reinforcement is itself surmounted by a tread.
• the term "axial" means a direction parallel to the axis of rotation of the tire and by "radial” a direction intersecting the axis of rotation of the tire and perpendicular thereto.
• the axis of rotation of the tire is the axis around which it rotates in normal use.
• a circumferential plane or circumferential cutting plane is a plane perpendicular to the axis of rotation of the tire.
• the equatorial plane or median plane circumferential is the circumferential plane passing through the center or top of the tread and which divides the tire into two halves.
• a radial plane is a plane which contains the axis of rotation of the tire.
• the longitudinal direction of the tire is the corresponding direction. in a periphery of the tire and defined by the rolling direction of the tire.
• the tires for civil engineering vehicles as described above, are usually subjected to a pressure of between 6 and 10 bars for usual loads and dimensions.
• the carcass of radial tires, and more particularly with regard to very large tires is subjected to large radial deformations leading to significant bending, in particular due to the load carried by the tire.
• the difficulties of access and the performance requirements lead the manufacturers of these vehicles to increase their carrying capacity. It follows that the vehicles are getting larger and therefore themselves heavier and heavier and can carry an increasingly large load.
• the deflection of a tire is defined by the radial deformation of the tire, or variation in the radial height, when the latter passes from an unloaded state to a static loaded state, under nominal load and pressure conditions. It is expressed in the form of a relative arrow, defined by the ratio of this variation in the radial height of the tire to half the difference between the outside diameter of the tire and the maximum diameter of the rim measured on the hook.
• the outside diameter of the tire is measured statically in an unloaded state at nominal pressure. These arrows lead in the area of the tire contact area on the ground to a support of the lower part of the sidewalls on the rim hooks.
• the tire thus undergoes radial stresses in this zone. These are combined with longitudinal constraints due in particular to the derialization of the tire in the area of the contact area. The combination of these constraints is reflected in particular by friction of the tire on the loose hooks. These stresses borne by the tires thus generate cracks in the rubber mixtures, cracks which propagate in said mixtures and which penalize the endurance of the tire. These constraints also result in premature wear of the rubber mixtures in contact with the rim hooks.
• patent application WO 00/71365 describes a technique making it possible to simplify the mounting of tires those being mounted directly on the hub, then acting as a rim. Independent rings then play the role of the rim seats and are held in place by locking rings which join to the hub due in particular to complementary profiles.
• the inventors have thus given themselves the mission of improving the endurance and the resistance to wear of tires, in particular under the effect of the radial and longitudinal stresses described above and experienced by the tire.
• an assembly mounted for heavy vehicle inflated to its nominal pressure, consisting of a rim and a tire, the tire comprising a radial carcass reinforcement anchored to two beads, surmounted by a crown reinforcement, itself surmounted by a tread connected to the beads by .
• sidewalls and the rim being provided with two seats extended by rim hooks and intended to receive the beads of the tire, at least one device external to the tire and to the rim coming to bear by applying pressure to at least one annular part of a sidewall, said device being simultaneously supported on a rim hook, the device being of toroidal shape and defining an internal cavity.
• a toroidal device means a device similar to a tire, that is to say a device defined by any section which generates the surface of the device by rotation around an axis located in the plan of the said section and not passing through its center.
• This toroidal shape must also be understood in the sense of the invention as encompassing a surface having a periodic variation in its section, that is to say a surface formed by the repetition of an elementary pattern of said surface. This is in particular a pattern conferring an undulation of the surface of the device.
• rim includes the rim of a wheel whether it is of the monobloc type or in several parts as well as the case of a rim formed by a part of a hub associated with several rings as described in document WO 00/71365. •
• the assembled assembly thus described comprising a device interposed between the part of the tire usually coming to bear on the rim hook and said rim hook and said device coming into abutment by exerting pressure on the tire makes it possible to limit the radial deformations or bending of the sidewalls of the tire.
• the deflection of the tires in the area of contact with the ground is less than 30%.
• the mounted assembly comprises two similar devices each associated with one of the rim hooks in particular to ensure symmetry in the deformation of the tire.
• the device advantageously chosen with low longitudinal rigidity, interposed between the rim hook and the sidewall of the tire makes it possible to absorb at least part of the longitudinal stresses in particular due to the derialization of the tire at the entry and exit of the tire contact area on the ground. This effect is further reinforced in the case of a surface having a periodic variation in its section such as an undulation of said surface, the device then having almost no longer any longitudinal rigidity.
• the section of the device varies over its periphery.
• the device combines a function of limiting the bending and a function of carrying the sidewalls, by further improving the endurance of the tire.
• the device consists of at least one layer of polymer conferring in particular the longitudinal deformation absorbing the deformations of the tire due to its derialization.
• the device is preferably made up of at least one layer of polymer comprising reinforcing elements and the reinforcing elements are preferably arranged in an orientation. radial.
• the radial orientation of the reinforcing elements makes it possible in particular to. maintain the low longitudinal rigidity of the device and therefore the possibility of better compensating for the phenomena of derialization of the tire in the area of the contact area.
• Alternative embodiments also provide for the presence of reinforcing elements in only part of the polymer layer.
• the device can advantageously be produced according to a manufacturing process similar to that of a tire and more exactly for example by curing and / or vulcanization in a mold of a complex combining a rubber mixture and reinforcing elements. .
• the device can for example be assimilated to a simple carcass-type structure.
• the reinforcing elements of this structure will advantageously be anchored in each of the ends of the structure by association with circumferential reinforcing elements arranged adjacent to said reinforcing elements of the structure.
• This type of assembly was presented previously in the introduction during the recall on tires.
• the device can be an open toroidal envelope or a closed toroidal envelope; the closure can for example be obtained after cooking by bringing the free ends together and then hot or cold bonding according to all types of techniques known to those skilled in the art.
• the device forming an open or closed envelope defines an internal cavity. According to a more particularly advantageous embodiment and in particular making it possible to limit the risks of rapid wear of the.
• the device has a surface with a low coefficient of friction at least in its part coming into contact with the tire.
• This surface with low coefficient of friction can be obtained by the choice of the material constituting the device and for example of the polymeric mixture in the case of a polymeric layer. It can also be obtained by coating the surface of the device with a product with a low coefficient of friction such as products based on Teflon.
• the surface with low coefficient of friction can be obtained by producing a structured surface, for example during molding in the case of a polymeric layer, which makes it possible to contain a lubricating fluid substance which is gradually released by wear. Such a substance can be incorporated by any means known to those skilled in the art over depths of between 1 and 4 millimeters.
• the device extends at least to the bead of the tire.
• the device is found after inflation of the assembly mounted integral with the latter and completely blocked due to the pressure which brings the bead of the tire against the lashing hook via said device.
• the device can also extend to the axially inner part of the bead of the tire. The device is then present under the bead. It is also also possible to provide an end of the device which goes beyond the axially inner end of the bead, in particular to facilitate the industrial production of the assembly of the device and the tire.
• the device is of pneumatic type and said device is inflated to a pressure substantially equivalent to that of the tire and preferably equal to that of the tire.
• the reaction of the device on the sidewall of the tire by bearing on the rim hook makes it possible, as previously stated, to limit the deformation of the sidewall part in contact with the device in the area of the contact area and also absorbs part of the surface deformation of the tire due to the derialization of said tire in the area of the contact area due to its deformation and its low longitudinal rigidity.
• the pneumatic type device forms at least one cavity advantageously delimited internally by a layer of a material having an air tightness, such as a butyl layer.
• the device can advantageously include several longitudinal cavities; such an embodiment allows in particular to keep the function of the device if one of the cavities is accidentally degraded.
• the device according to the invention is pressurized by any means known to those skilled in the art.
• the device is connected to the tire cavity.
• Such an embodiment ensures identical pressures.
• each of them is advantageously connected to the tire cavity.
• the seal is no longer produced between the rim seat and the bead of the tire but the latter is effected on the one hand between the device and the rim hook with which it is in contact and between the device and the bead and / or the sidewall of the tire on the other hand.
• said device advantageously comprises a system making it possible to drain the air, said system being at least present under the bead of the tire.
• the invention also advantageously provides that the part of the device which comes under the bead of the tire and in contact with the seat of the rim comprises oriented reinforcing elements. circumferentially to improve the distribution of pressures on the seat of the rim.
• the air intake in the device according to the invention is done by a capillary type system so as to limit the flow rate. Such a system will lead to increased inflation times of the device according to the invention, but will have the advantage of being able to increase the deflation time of the assembled assembly in the opposite direction in the event of degradation or puncture of the device according to the invention.
• Such an embodiment can in particular allow the vehicle to be returned to a repair area in the event of an accident.
• the supply of air into the device according to the invention can also be advantageously obtained by a high-flow system comprising a closure device actuated by a pressure difference between the device and the tire cavity.
• the implementation of the shutter device can for example be obtained by a valve and spring system or any other means known to those skilled in the art.
• the inflation times of the device are then not increased and in the event of degradation of the device, the pressure of the tire is not affected.
• the invention advantageously provides, according to this first alternative embodiment, that the walls of the internal cavity or cavities of the device have surfaces with low coefficient of friction.
• the device forms at least one cavity filled with an incompressible product.
• the reaction of the device on the sidewall of the tire by bearing on the rim hook makes it possible to limit the deformation of the sidewall part in contact with the device in the area of the contact area and moreover compensates for the derialization of the tire in the area of the contact area due to its deformation and its low longitudinal rigidity.
• the adequate deformation of the device according to the invention making it possible to limit the deformation of the sidewall part of the tire is obtained by a choice of volume of the product introduced into the device; the choice of this volume combined with the inflation of the tire and its use results in the desired pressure resultant which is exerted on a part of the sidewall of the tire.
• the incompressible product according to this variant embodiment can be any type of fluid such as water, oil.
• the device then forms at least one cavity advantageously delimited internally by a layer of material which is stable vis-à-vis the fluid such as nitriles or polyurethane.
• the dynamic viscosity of the incompressible product is greater than 10 poises.
• the realization of this type of device according to the invention allows, due to the choice of the viscosity of the product, to obtain a longitudinal propagation of the deformation of the device slower during the rotation of the tire in use and thus impart a damping effect.
• the incompressible product according to this variant embodiment can be any product known to those skilled in the art, such as oils, silicone gels or polyurethane.
• said incompressible product can also be a crosslinked polymer preferably having a penetration rate of between 50 and 500 tenths of a millimeter, the measurement being carried out by penetrometry according to ASTM D217. More preferably, the crosslinked polymer has a shore hardness less than 20; these are for example silicone gels.
• the choice of such a crosslinked polymer confers properties of deformation and stability which, in particular according to the invention, provides a function of limiting bending and a function of carrying the sidewalls and also makes it possible to absorb at least part of the stresses. longitudinal in particular due to the derialization of the tire; in addition, the choice of such a crosslinked polymer can authorize operation of the device in the event of partial degradation of said device.
• the device forms a cavity comprising at least one annular pocket filled with an incompressible product and an elastic annular zone.
• the reaction of the device on the sidewall of the tire by resting on the rim hook makes it possible to limit the deformation of the sidewall part in contact with the device in the area of the contact area and also compensates for the derialization of the tire in the area of the area of contact. contact due to its deformation and its low longitudinal rigidity.
• the elastic axial deformation of the device allows the deformation of the sidewalls of the tire to be limited, regardless of the volume of the product.
• a preferred embodiment of this third alternative embodiment of the invention provides for the device to form a cavity comprising at least two annular pockets each filled with an incompressible product, said two annular pockets being separated by an elastic annular zone.
• the device is compartmentalized in the circumferential direction to form a series of circumferentially contiguous cells.
• the device comprises cells or compartments separated from each other by partitions preferably made of polymeric material in the case of a polymer device.
• Such an embodiment also makes it possible to limit the risks of immobilization of a vehicle in the event of degradation of the device according to the invention since such degradation will be localized on a limited number of cells but will not affect the entire device. It can also allow you to continue driving normally as soon as. only isolated cells are degraded, the device no longer being as effective but still bringing an advantage in terms of endurance. More preferably still according to this type of embodiment of the device according to the invention, two contiguous cells communicate with each other. An appropriate choice of the diameter of the means authorizing the communication or else the choice of products with high dynamic viscosity will make it possible to create a damping function of the device.
• the device is circumferentially discontinuous to form elementary structures.
• the device is formed by a set of elementary structures independent of each other and separated from each other in the circumferential direction.
• the elementary structures are linked to each other to form a unitary device of toroidal shape whose handling and installation will be simplified compared to elementary structures independent of each other.
• the invention advantageously proposes to limit the height of said reversals to the contact zone between the sidewall and the device according to the invention.
• the device according to the invention external to the tire and to the rim, can be proposed as an independent element inserted during assembly of the mounted assembly.
• the invention also provides alternative embodiments according to which the device is linked beforehand to a rim hook, in particular in the case of multi-part wheels as is usually the case for large tires for engineering vehicles. -civil or in the case of the technique as described in document WO 00/71365.
• the device according to the invention can be made integral with a rim hook before mounting the tire. • It is also possible according to the invention to provide a tire associated, prior to its mounting on a rim, with at least one device according to the invention, as described above, by any means known to those skilled in the art such as hot or cold bonding.
• the invention thus also proposes a tire for heavy vehicle, comprising a radial carcass reinforcement anchored to two beads, surmounted by a crown reinforcement, itself surmounted by a tread connected to the beads by sidewalls, at least an external device secured to the tire coming to bear on at least part of a sidewall and said device being of the toroidal type.
• the invention also proposes a method for limiting the bending of the sidewalls of a tire, comprising a radial carcass reinforcement anchored to two beads, surmounted by a crown reinforcement, itself surmounted by a tread connected to the beads by sidewalls, forming an assembly mounted for heavy vehicle by association with a rim, provided with two seats extended by hooks and intended to receive the beads of the tire, at least one device external to the tire and to the rim applying equivalent pressure at the inflation pressure on at least part of a sidewall while also taking support on a lashing hook.
• FIGS. 1 to 4 represent: FIG.
• FIG. 1 a diagram seen in radial section of a tire of Civil Engineering according to the invention, Figure 2, a schematic representation seen in radial section of a first embodiment of the invention, - Figure 3, a schematic representation seen in radial section of a second embodiment of the invention, Figure 4, a schematic representation in radial section of a third embodiment of the invention.
• the figures are not shown to scale to simplify understanding. The figures represent only half of the architectures which extend symmetrically with respect to the axis XX 'which represents the circumferential median plane of a tire.
• FIG. 1 is shown schematically a radial section of a tire 1 usually used for civil engineering vehicles.
• This tire 1 is a large tire with an aspect ratio H / S of 0.80, H being the height of the tire on the rim and S the maximum axial width of the tire, when the latter is mounted on its service rim and inflated to, its recommended pressure.
• This tire 1 comprises a carcass reinforcement 2 composed of a sheet of inextensible steel cables made of steel, anchored in each bead to a bead wire 3 to form a reversal 4.
• the carcass reinforcement 2 is radially surmounted by a crown reinforcement 5.
• Said crown reinforcement 5 usually consists on the one hand of two plies, called working plies, and on the other hand of two protective plies.
• the working plies are themselves made up of inextensible steel cables, mutually parallel in each ply and crossed from one ply to the next, making angles with the circumferential direction which may be between 15 ° and 45 °.
• the protective plies generally consist of elastic steel metallic cables, mutually parallel in each ply and crossed between them from one ply to the next, also making angles which may be between 15 and 45 °.
• the cables of the radially outer working ply are usually crossed with the cables of the radially inner protective ply.
• the detail of the crown reinforcement is not shown in the figures.
• the crown reinforcement is finally surmounted by a tread 6 which is joined to the two beads 7 by the two sidewalls 8.
• the tire is shown mounted on a rim hook 9 whose axial width is greater than the usual width of wheel rim hook intended for this type of application.
• the invention also advantageously provides a rim hook whose axially outer diameter is less than the maximum diameter of said hook; in other words the rim hook can advantageously be made with a slope by relative to the axial direction, the slope being directed towards the axis of rotation when one is oriented axially outward.
• a device 10 of toroidal shape is interposed between the bottom of the sidewall 8 and the hook 9 of the rim.
• the device 10 consists of a polymer layer comprising reinforcing elements oriented radially.
• the device 10 is inserted between the lower region of the sidewall 8 and the rim hook 9 makes it possible to limit the bending of the sidewalls of the tire around the wheel in the area of contact air.
• the radial orientation of the reinforcing elements gives the device low longitudinal rigidity and therefore the possibility of at least partially compensating for the phenomena of deradialization of the tire in the area of the contact area.
• the reduction in the stresses borne by the tire due to these deformations makes it possible to significantly improve the performance of the tire in terms of endurance and wear.
• the problems linked to compression of the carcass ply reversals are also reduced.
• the device 102 is integral with the tire 12 and fixed to the lower part of the sidewall 82.
• the device 102 can be of the pneumatic type and it is inflated to a pressure substantially equivalent to that of the pneumatic.
• a preferred embodiment of the invention provides that the pressure is identical to that of the tire; the internal volume of the device 102 is then advantageously linked to that of the tire.
• a drain 112 is taken between the two ends 122, 132 of the device 102. The use of the drain 112 will delay the inflation of the device 102 but will, in the event of an incident, delay the deflation of the tire and thus allow the return of the vehicle to allow repair.
• the tire then comprises, under the lower surface 72 of the bead, elements in relief, not shown in the figure, to allow the passage of air from the tire to the device 102 when the tire is mounted on the seats of a rim.
• the device 102 forms a cavity which can be filled with an incompressible product whose dynamic viscosity is advantageously greater than 10 poises to confer a damping function. They may, for example, be silicone gels.
• the damping function of the device according to the invention is more particularly advantageous in the case of a loader type vehicle which have a natural tendency to create oscillations of the vehicle as soon as it moves with a loaded shovel. The device can then make it possible to attenuate this phenomenon of oscillations.
• FIG. 3 illustrates a schematic representation seen in radial section of another exemplary embodiment of the invention. This embodiment differs from that of FIG. 2 in that the device 103 is extended to the axially inner end 73 of the bead of the tire.
• the device 103 also includes a drain
• the reaction of the device 10, 102, 103 on the sidewall of the tire 1, 12, 13 while resting on the rim hook 9 makes it possible to limit the deformation of the part of the sidewall in contact with the device in the area of the contact area.
• the device 10, 102, 103 also makes it possible to partially absorb the deformation of the tire due to the derialization of the tire in the area of the contact area due to the low longitudinal rigidity of the device 10, 102, 103.
• FIG. 4 illustrates a schematic representation seen in radial section of a third embodiment of the invention.
• the device 104 forms a cavity comprising two annular pockets 144, 154 each filled with an incompressible product, said two annular pockets being separated by an elastic annular zone 164.
• the elastic deformation of the device 104 when the tire is pressurized makes it possible to obtain the desired reaction pressure of the device on the sidewall, regardless of the volume of the product.
• the choice of a product with high dynamic viscosity makes it possible to provide a damping function as described above.

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

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• 2004
  • 2004-05-19 FR FR0405552A patent/FR2870481B1/fr not_active Expired - Fee Related
• 2005
  • 2005-05-13 US US11/597,193 patent/US20070246143A1/en not_active Abandoned
  • 2005-05-13 JP JP2007517053A patent/JP2007537918A/ja not_active Abandoned
  • 2005-05-13 WO PCT/EP2005/005276 patent/WO2005110779A1/fr not_active Ceased

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