WO2008010388A1 - Pneu à affaissement limité - Google Patents
Pneu à affaissement limité Download PDFInfo
- Publication number
- WO2008010388A1 WO2008010388A1 PCT/JP2007/062618 JP2007062618W WO2008010388A1 WO 2008010388 A1 WO2008010388 A1 WO 2008010388A1 JP 2007062618 W JP2007062618 W JP 2007062618W WO 2008010388 A1 WO2008010388 A1 WO 2008010388A1
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- WO
- WIPO (PCT)
- Prior art keywords
- tire
- cord
- run
- carcass
- dtex
- Prior art date
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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
- B60C9/02—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
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- 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
- B60C17/0009—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts
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- 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
- B60C9/0042—Reinforcements made of synthetic materials
Definitions
- the present invention relates to a run-flat tire, and more particularly to a run-flat tire that has improved run comfort during normal driving and reduced tire weight while maintaining run-flat durability, rough road durability, and uniformity. It is.
- a tire that can safely travel a certain distance without losing its load supporting ability even when the tire has a reduced internal pressure due to puncture for example, a so-called run flat tire
- a crescent-shaped side reinforcing rubber layer with a relatively high modularity is placed inside the carcass on the side to improve the rigidity of the side, and the load can be applied without excessively increasing the sag deformation of the side when the internal pressure decreases.
- Various types of side-reinforced run-flat tires that can be borne have been proposed (see JP 2000-264012, JP 2002-500587, JP 2002-500589 and JP 2004-306658). .
- the above-mentioned side-reinforced run-flat tire has a side reinforcing rubber layer with a crescent-shaped cross section on the side, so that the vertical panel is larger than that of a normal tire. There is a problem that it is uncomfortable.
- the above-mentioned side reinforcement type run flat tire has a side reinforcement rubber layer, the tire weight is increased as compared with a normal tire, and the weight under the panel increases, resulting in poor steering stability. There is also the problem of hesitation. Further, the side-reinforced run-flat tire has an adverse effect on the durability of the vehicle due to an increase in vehicle input due to an increase in tire weight.
- normal roads are usually used for rough roads such as road surface irregularities (protrusions and potholes), instantaneous large inputs on wavy roads, and local inputs (side cuts) to sidewalls.
- rough roads such as road surface irregularities (protrusions and potholes), instantaneous large inputs on wavy roads, and local inputs (side cuts) to sidewalls.
- durability safety (durability on rough roads) required for driving in a normal state.
- two or more carcass plies must be applied. Met.
- an object of the present invention is to solve the above-described problems of the prior art and improve ride comfort during normal driving while maintaining run-flat durability, rough road durability, and uniformity.
- the object is to provide a run-flat tire with reduced weight.
- the present inventor has used a polyketone fiber cord having a specific heat shrinkage stress and elastic modulus as a carcass reinforcing cord, At least in part, a reinforcing cord layer using polyketone fiber cords with specific heat shrinkage stress and elastic modulus is arranged to maintain run-flat durability, rough road durability, and uniformity, while maintaining normal driving. It has been found that the ride comfort can be improved and the tire weight can be reduced, and the present invention has been completed.
- the run-flat tire of the present invention includes at least one radial carcass having a toroidal shape between bead cores embedded in a pair of bead portions, and a crown of the radial carcass.
- a tread portion disposed on the outer side of the tire in the tire radial direction, a pair of buttress portions located at both ends of the tread portion, a pair of side portions connecting the buttress portion and the bead portion, A pair of crescent-shaped side reinforcing rubber layers disposed on the side portion, a bead filler disposed on the outer side in the tire radial direction of the bead core, a belt end force, a region A up to the maximum width portion of the tire side portion, and the bead core.
- a reinforcing cord layer disposed in at least a part of the region B up to the bead filler, and the cord constituting the carcass ply and the auxiliary Code constituting the cord layer is, The following formula (I) and formula ( ⁇ ):
- the reinforcing cord layer is preferably disposed on at least a part of the outer side of the side reinforcing rubber layer, and may be positioned on the outer side of the radial carcass or may be positioned on the inner side.
- the heat shrinkage stress ⁇ of the polyketone fiber cord at 177 ° C is a 5 ° C / 25 cm long fixed sample of the polyketone fiber cord before vulcanization subjected to general dipping treatment. This is the stress generated in the cord at 177 ° C when heated at a heating rate of 5 minutes, and the elastic modulus E of the above-mentioned polyketone fiber cord at 49N load at 25 ° C is SS by JIS cord tensile test. It is the elastic modulus in the unit cN / dtex where the tangential force at 49N of the curve is also calculated.
- the angle of the polycarbonate fiber cord in the reinforcing cord layer with respect to the tire radial direction is 5 ° or less.
- the polyketone fiber cord in the carcass ply and the reinforcing cord layer has an elastic modulus E at a load of 49 N at 25 ° C. of 30 to 170 cN / dtex and a heat at 177 ° C. Shrinkage stress ⁇ force S0.2 to 1.5 cN / dtex is preferable.
- a polyketone fiber cord having a specific heat shrinkage stress and elastic modulus is used as a carcass reinforcing cord, and a specific heat contraction stress and elastic modulus are provided on at least a part of the outside of the carcass.
- Reinforcement cord layer using polyketone fiber cords with a good durability for run-flat, rough road durability and uniformity while ensuring good riding comfort and reduced tire weight Run flat tires can be provided.
- FIG. 1 is a right half sectional view of an example of a run flat tire of the present invention.
- FIG. 2 is a cross-sectional view of the right half of another example of the run flat tire of the present invention.
- FIG. 3 is a cross-sectional view of the right half of another example of the run flat tire of the present invention.
- FIG. 4 is a cross-sectional view of the right half of another example of the run flat tire of the present invention.
- FIG. 5 is a cross-sectional view of the right half of another example of the run flat tire of the present invention.
- FIG. 6 is a cross-sectional view of the right half of another example of the run flat tire of the present invention.
- FIG. 7 is a cross-sectional view of the right half of another example of the run flat tire of the present invention.
- FIG. 8 is a cross-sectional view of the right half of another example of the run flat tire of the present invention.
- FIG. 9 is a partial cross-sectional view of a run-flat tire during run-flat running, which was subjected to computer analysis.
- FIG. 10 is a cross-sectional view of the right half of the tires of Comparative Example 1 and Comparative Example 2.
- FIG. 11 is a cross-sectional view of the right half of the tire of Comparative Example 3.
- FIG. 12 is a cross-sectional view of the right half of the tire of Comparative Example 4.
- FIG. 1 is a partial cross-sectional view of one embodiment of the run-flat tire of the present invention.
- FIGS. 2, 3, 4, 5, 6, 6, 7 and 8 show the run-flat tire of the present invention. It is a fragmentary sectional view of other embodiments.
- the tires shown in FIGS. 1 to 7 are radially outward from the inner side to the outer side in the tire width direction around the bead core 2 and the bead core 2 that are respectively embedded in the bead cores 2 embedded in the pair of bead parts 1.
- a radial carcass 3 having a folded-back portion, a tread portion 4 disposed outside the radial portion of the radial carcass 3 in the tire radial direction, and a pair of buttress portions positioned at both ends of the tread portion 4 5, a pair of side portions 6 that connect the buttress portion 5 and the bead portion 1, and a pair of cross-section crescent-shaped side reinforcing rubbers disposed inside the radial carcass 3 of the side portion 6 With layer 7.
- the tire shown in FIGS. 1 to 5 includes a reinforcing cord layer 8 disposed on at least a part of the outer side of the radial carcass 3, and the tire shown in FIGS. 6 to 7 includes the side reinforcing rubber layer 7.
- a reinforcing cord layer 8 is provided on the outside and at least a part of the inside of the radial carcass 3.
- a bead filler 9 is disposed between the main body portion and the folded portion of the radial carcass 3 and outside the bead core 2 in the tire radial direction.
- Two belts 10 having a belt layer force are disposed on the outer side of the radial portion of the radial carcass 3 in the tire radial direction.
- the belt reinforcing layer 11A is disposed so as to cover the entire belt 10
- a pair of belt reinforcing layers 11B are disposed so as to cover only both end portions of the belt reinforcing layer 11A.
- the belt layer is usually composed of a rubberized layer of a cord extending in an inclined manner with respect to the tire equatorial plane, preferably a rubberized layer of a steel cord, and the two belt layers constitute the belt layer.
- the belt 10 is formed by stacking the cords so that they cross each other across the tire equatorial plane.
- the belt reinforcing layers 11A and 11B usually have a rubberized layering force of cords arranged substantially parallel to the tire circumferential direction.
- the radial carcass 3 of the tire shown in FIGS. 1 to 7 has a force formed by one carcass ply.
- the number of carcass plies constituting the radial carcass 3 is limited to this.
- the structure of the radial carcass 3 is not particularly limited.For example, as shown in the tire shown in FIG. 8, the end of the radial carcass 3 is connected to a two-layer bead core. A structure sandwiched between 2 may be used.
- the belt 10 of the tire shown in Figs. 1 to 8 has a force that is a force of two belt layers.
- the number of belt layers constituting the belt 10 is not limited to this.
- the belt reinforcing layers 11A and 11B of the tire shown in FIGS. 1 to 8 are composed of one belt reinforcing layer 11A covering the entire belt 10 and one belt reinforcing layer covering only both ends of the belt reinforcing layer 11A.
- 11B which has a so-called cap layer structure, but in the present invention, the belt reinforcement layers 11A and 11B are not necessarily provided, and a belt reinforcement layer having a different number of layers is provided. You can also
- the tire shown in FIGS. 1 to 8 includes a rim guard 12 having a substantially triangular cross section on the outer side in the tire width direction of the folded portion of the radial carcass 3 in the region extending from the side portion 6 to the bead portion 1.
- a rim guard 12 having a substantially triangular cross section on the outer side in the tire width direction of the folded portion of the radial carcass 3 in the region extending from the side portion 6 to the bead portion 1.
- the maximum width portion of the tire side portion refers to the maximum width portion of the tire side portion when the rim guard 12 exerts force.
- the reinforcing cord layer 8 is disposed in the portion.
- the number of reinforcing cord layers may be one or two or more.
- the structure of the reinforcing cord layer 8 is particularly For example, as shown in FIG. 1, one reinforcing cord layer 8 is provided between the main body portion of the radial carcass 3 and the bead filler 9 along the outside of the radial carcass 3 from the end of the belt 10. After that, as shown in FIG.
- the reinforcing cord layer 8 extends from the end of the belt 10 to the end of the carcass folded portion as shown in FIG. 2, which extends to the vicinity of the bead core 2 embedded in the bead portion 1.
- An embodiment arranged outside the radial carcass 3 in the region, as shown in FIG. 3, an embodiment arranged between the main body of the radial carcass 3 and the bead filler 9, and as shown in FIG. FIG. 5 shows an arrangement of the belt 10 on the outside of the radial carcass 3 in the region from the end of the belt 10 to the end of the folded portion of the carcass and between the main body of the radial carcass 3 and the bead filler 9.
- the belt layer 8 extends to the bead portion 1 along the outer side of the radial force of the belt 10, extends between the body portion of the radial carcass 3 and the bead filler 9, and is embedded in the bead portion 1.
- the reinforcing cord layer 8 is bent from the end of the belt 10 along the inner side of the radial carcass 3 as shown in FIG.
- the reinforcing cord layer 8 is connected to the end portion of the belt 10 through the space between the layers 7 and to the vicinity of the bead core 2 embedded in the bead portion 1.
- the cord constituting the carcass ply and the cord constituting the reinforcing cord layer 8 are represented by the following formulas (I) and (II):
- the polyketone fiber cord has a characteristic that it is heat-shrinkable with a large heat-shrinkage stress at a high temperature of about 100 ° C. or higher, because it has higher rigidity than a rayon cord or the like.
- the polyketone fiber cord to be used does not satisfy the relationship of the above formula (I)
- a cord having a large heat shrinkage stress ⁇ but a low elastic modulus ⁇ is used, the tire length during run-flat running is reduced.
- a cord with a high elastic modulus ⁇ but a small thermal shrinkage stress ⁇ is used, the vertical panel of the tire during normal driving will not be sufficiently suppressed. This increases the tire comfort during normal driving.
- the cord used has a heat shrinkage stress at 177 ° C of less than ⁇ force 0.02 cN / dtex, the deflection during run-flat running will increase and run-flat durability will be insufficient.
- the polyketone fiber cord preferably has a heat shrinkage stress ⁇ at 177 ° C of 1.5 cN / dtex or less. If the heat shrinkage stress of polyketone fiber cord at 177 ° C exceeds the ⁇ force Sl.5c N / dtex, the shrinkage force during vulcanization will be too large, resulting in cord irregularities inside the tire and rubber misalignment. Cause the durability to be bad and cause the badness of the uniformity.
- the polyketone fiber cord has a heat shrinkage stress ⁇ at 177 ° C of 0.20 cN / dtex or more from the viewpoint of sufficiently suppressing deformation of the tire during run-flat running.
- the polyketone fiber cord preferably has a flatness ratio E of 30 cN / dtex or higher at 49 N load at 25 ° C, from the viewpoint of sufficiently suppressing deformation of the tire during run flat running. From the viewpoint of reliably suppressing the deformation of the tire during running, it is more preferable that the elastic modulus E at a load of 49 N is 80 cN / dtex or more.
- the above-mentioned polyketone fiber cord has a favorable fatigue resistance, preferably from an elastic modulus E force at a load of 49 N at 25 ° C of not more than 70 cN / dtex from the viewpoint of ensuring sufficient fatigue resistance. From the viewpoint, it is more preferable that the elastic modulus E at a load of 49 N is 150 cN / dtex or less.
- the bow I tension stress on the carcass ply is large during run-flat running, and the reinforcement is focused on the heel region. It is effective to arrange the code layer 8.
- the region was a region A from the belt end to the maximum width portion of the tire side portion and a region B to the bead core vicinity force bead filler. Therefore, the reinforcing cord layer 8 using polyketone fiber cords is disposed in at least part of the region A up to the belt end force and the maximum width of the tire side portion and the region B up to the bead core.
- the runflat durability of the tire can be effectively improved without increasing the tire weight.
- a carcass ply using a conventional rayon and a carcass ply is composed of one carcass ply using a polyketone fiber cord and one reinforcing cord layer using a polyketone fiber cord.
- the tire weight can be significantly reduced.
- the side reinforcing rubber layer 7 thinned until the run-flat durability is equivalent to that of the conventional product the tire weight can be further reduced, and the vertical panel of the tire can be reduced to improve the ride comfort. It is also possible to improve the performance.
- the reinforcing cord layer 8 when the reinforcing cord layer 8 is arranged in the region B up to the bead filler 9 in the vicinity of the bead core 2 as well, the pothole input and the tires with the carcass made of two carcass plies using the conventional rayon can be used. It is possible to improve the durability against a momentary heavy load input on a wavy road. And if the reinforcing cord layer is placed in both the belt end force area A up to the maximum width part of the tire side and the area B up to the bead core vicinity B, the tire strength against irregular input on rough roads is improved. And further improve the run-flat durability.
- the structure of carcass 3 has an envelope structure (carcass as shown in Fig. 11).
- This method has a problem that the joint of Carcass 3 overlaps and the tire uniformity decreases.
- the carcass 3 having an envelope structure using the conventional rayon is replaced with one carcass ply using the polyketone fiber cord and one reinforcing cord layer using the polyketone fiber cord, the carcass 3 Since the joints of the tires do not overlap, deterioration of tire uniformity can be avoided.
- the angle of the polyketone fiber cord in the reinforcing cord layer 8 with respect to the tire radial direction is preferably 5 ° or less.
- the reinforcing cord layer 8 formed with a polyketone fiber cord in the shape of a hook is provided with the polyketone fiber cord 5 in the tire radial direction. ° Arrangement so that the angle is below, it is possible to effectively reduce the bow I tension stress on the carcass 3.
- the polyketone fiber cord is preferably formed by twisting two or three filament bundles having a polyketone strength of a fineness of 500 to 2000 dtex.
- a polyketone strength of a fineness of 500 to 2000 dtex When the fineness of the filament bundle used for the polyketone fiber cord is less than 500 dtex, both the elastic modulus and the heat shrinkage stress are insufficient, and when it exceeds 2000 dtex, the cord diameter becomes thick and the driving cannot be made dense. Also, polyketone power Even if the number of filament bundles is greater than or equal to the number of filament bundles, there is no particular limitation as long as the relationship of the above formulas (I) and (II) can be satisfied.
- the polyketone fiber cord preferably has a reversibility that shrinks at a high temperature and expands when returned to room temperature.
- the polyketone fiber cord in the carcass ply and the reinforcing cord layer 8 is contracted at high temperatures, that is, when running in a run-flat state, so that the rigidity is increased and the stagnation of the side portion of the tire can be suppressed. That is, the rigidity of the polyketone fiber cord in the cord layer is reduced during normal running and the rigidity of the tire is reduced, and the tire's vertical panel is lowered.
- a reversible polyketone fiber cord with a difference in thermal shrinkage stress between 20 ° C and 177 ° C of 0.20 cN / dtex or more, preferably 0.25 cN / dtex or more, it can be used during normal running and run-flat running. The effects of can be balanced.
- the polyketone fiber cord used for the carcass ply of the run-flat tire of the present invention has the following formula (III):
- N is the number of twists (times / 10 cm)
- p is the specific gravity of the cord (g / cm 3 )
- D is the total number of decitex (dtex) of the cord (Nt ) Is preferably 0.34 or more.
- the twist coefficient (Nt) of the polyketone fiber cord used for the carcass ply is less than 0.34, the fatigue property is lowered and the durability is insufficient.
- the number of driven polyketone fiber cords is preferably in the range of 35 to 60 (lines / 50 mm).
- the number of polyketone fiber cords driven into the carcass ply is less than 35 (lines / 50 mm)
- the carcass strength is insufficient and the durability is insufficient. Even if the number of shots exceeds 60 (pieces / 50 mm), there is no particular limitation as long as the shots can be driven.
- the polyketone fiber cord used for the reinforcing cord layer 8 of the run-flat tire of the present invention preferably has a twist coefficient (Nt) defined by the above formula (III) of 0.25 or more.
- Nt twist coefficient
- the number of driven polyketone fiber cords is preferably in the range of 5 to 60 (lines / 50 mm).
- the number of polyketone fiber cords driven in the reinforcing cord layer 8 is less than the number of cores (50 / 50mm), It is not possible to sufficiently suppress stagnation of the tire during running, and there is a tendency that the run-flat durability of the tire cannot be sufficiently improved.On the other hand, if it exceeds 60 (50 / 50mm), The vertical panel of the tire during normal driving tends to increase, and the tire comfort during normal driving tends to deteriorate.
- the twist structure of the polyketone fiber cord is not particularly limited, and examples of the polyketone fiber cord include twisted filament bundles having a polyketone force, and twisted filament bundles having a polyketonker. Can be used.
- the polyketone used as a raw material for the polyketone fiber cord is represented by the following general formula (IV):
- A is a portion derived from an unsaturated compound polymerized by an unsaturated bond, and each repeating unit may be the same or different! /, And the repeating unit force represented by Preferred polyketones are preferred.
- Preferred polyketones 97 mole 0/0 on more than 1-O Kiso trimethylene the repeating units [- CH -CH-CO-] in which polyketone is preferable instrument 99 mole
- polyketone whose% is 1-oxotrimethylene more than 100%. Most preferred is a polyketone whose 1-oxotrimethylene is 100 mol%.
- the polyketone as a raw material of the polyketone fiber cord may have a partially bonded ketone group and a portion derived from an unsaturated compound, but a portion derived from an unsaturated compound and a ketone group alternately.
- the proportion of the arranged parts is preferably 90% by mass or more, more preferably 97% by mass or more, and most preferably 100% by mass.
- ethylene is most preferable as the unsaturated compound forming A, but propylene, butene, pentene, cyclopentene, hexene, cyclohexene, Unsaturated hydrocarbons other than ethylene such as heptene, otaten, nonene, decene, dodecene, styrene, acetylene, and allene, methyl acrylate, methyl methacrylate, vinyl acetate, acrylamide, hydroxyethyl methacrylate, undecenoic acid , Undecenol, 6-chlorohexene, N-butyrrolidone, sulfuryl phosphonic acid jetyl ester, sodium styrene sulfonate, sodium aryl sulfonate, bur pyrrolidone, and compounds containing unsaturated bonds such as butyl chloride There may be.
- polymerization degree of the polyketone may be represented by the following formula:
- t and T are the flow time of a viscosity tube at 25 ° C. of a diluted solution of hexafluoroisopropanol with a purity of 98% or more and a polyketone dissolved in the hexafluoroisopropanol;
- C the intrinsic viscosity [7?] Defined by the mass of the solute in the diluted solution lOOmL (g)] is preferably in the range of l to 20dL / g, in the range of 2 to 10dL / g. It is even more preferable that it is in the range of 3 to 8, which is even more preferable.
- the intrinsic viscosity is less than IdL / g, the molecular weight is too small, and it becomes difficult to obtain a high-strength polyketone fiber cord, and troubles such as fluff and yarn breakage occur frequently during spinning, drying and drawing.
- the intrinsic viscosity exceeds 20 dL / g, it takes time and cost to synthesize the polymer, and it becomes difficult to uniformly dissolve the polymer, which may adversely affect the spinnability and physical properties.
- the polyketone fiberization method includes: (i) a method in which an undrawn yarn is spun and then subjected to multistage hot drawing, and drawn at a specific temperature and magnification in the final drawing step of the multistage hot drawing. And (ii) a method in which after unspun yarn is spun, heat-stretched, and rapidly cooled while high tension is applied to the fiber after the heat-stretching is preferred.
- a desired filament suitable for the production of the polyketone fiber cord can be obtained by fiberizing the polyketone by the method (i) or (ii).
- a spinning method of the unstretched yarn of the polyketone a conventionally known method without particular limitation can be adopted, and specifically, JP-A-2-112413 and JP-A-4-228.
- a polyketone polymer is dissolved in hexafluorosolpropanol, m-taresol, etc. at a concentration of 0.25 to 20% by mass, extruded from a spinning nozzle to be fiberized, and then toluene, ethanol Unstretched yarn of polyketone can be obtained by removing the solvent in a non-solvent bath such as, isopropanol, n- hexane, isooctane, acetone, methyl ethyl ketone, and washing.
- a non-solvent bath such as, isopropanol, n- hexane, isooctane, acetone, methyl ethyl ketone, and washing.
- a polyketone polymer is dissolved in an aqueous solution of zinc salt, calcium salt, thiocyanate, iron salt or the like at a concentration of 2 to 30% by mass, and 50 to Spinning nozzle force at 130 ° C Extruded into a coagulation bath to perform gel spinning, and further desalted and dried to obtain an undrawn polyketone yarn.
- aqueous solution in which the polyketone polymer is dissolved it is preferable to use a mixture of halogenated zinc and a halogenated alkali metal salt or a halogenated alkaline earth metal salt.
- An organic solvent such as acetone or methanol can be used.
- a hot drawing method in which the undrawn yarn is heated and drawn to a temperature higher than the glass transition temperature of the undrawn yarn is preferred.
- the drawing of the yarn may be performed in a single step in the method (ii), but is preferably performed in multiple steps.
- a method of running a yarn on a heating roll or a heating plate can be employed as the method of heat stretching.
- the total stretching ratio in which the heat stretching temperature is preferably in the range of 110 ° C to (the melting point of the polyketone) is preferably 10 times or more.
- the temperature in the final drawing step of the multistage hot drawing is 110 ° C to (the drawing temperature of the drawing step one step before the final drawing step is 3 ° C). ) Is preferred, and the draw ratio in the final drawing step of multi-stage hot drawing is 1.01 to 1 A range of .5 times is preferred.
- the tension applied to the fiber after completion of hot drawing is preferably in the range of 0.5 to 4 cN / dtex, and the cooling rate in rapid cooling is 30 °. It is preferable that the temperature is C / second or more.
- the cooling end temperature in the rapid cooling is preferably 50 ° C or less.
- the rapid cooling method of the heat-stretched polyketone fiber a conventionally known method without particular limitation can be adopted, and specifically, a cooling method using a roll is preferable. Since the polyketone fiber thus obtained has a large residual elastic strain, it is usually preferable to perform relaxation heat treatment so that the fiber length is shorter than the fiber length after hot drawing.
- the temperature of the relaxation heat treatment is preferably in the range of 50 to 100 ° C, and the relaxation ratio is preferably in the range of 0.980 to 0.999 times.
- the method for producing the polyketone fiber cord is not particularly limited.
- the polyketone fiber cord is formed by twisting a plurality of filament bundles having a polyketone strength, preferably two or three strands, that is, in a double twist structure, for example, the filament bundle having the polyketone strength is twisted. Then, a plurality of these are combined, and a twisted cord is obtained by applying an upper twist in the opposite direction.
- the polyketone fiber cord is twisted with one filament bundle that also has polyketone strength, that is, if it has a single twist structure, for example, the filament bundle that also has the polyketone force is gathered and twisted in one direction. Thus, it can be obtained as a twisted cord.
- a cord / rubber composite used for the carcass ply and the reinforcing cord layer can be obtained.
- the coating rubber of the polyketone fiber cord there is no particular limitation, and the coating rubber used in the conventional cord / rubber composite for tires can be used.
- the polyketone fiber cord Prior to the coating of the polyketone fiber cord with the coating rubber, the polyketone fiber cord may be subjected to an adhesive treatment to improve the adhesion to the coating rubber.
- the run-flat tire of the present invention uses, as a carcass ply, a cord Z rubber composite formed by coating the above-mentioned polyketone fiber cord with a coating rubber, and the above-mentioned polyketone as a reinforcing cord layer 8
- a cord / rubber composite obtained by coating a fiber cord with a coating rubber can be disposed on at least a part of the outside of the carcass and manufactured by a conventional method.
- the gas filled in the tire is usually Or an inert gas such as nitrogen having a changed oxygen partial pressure or nitrogen.
- Run-flat tires for passenger cars of size 245Z50 R18 having the structures shown in Tables 1 to 4 were produced.
- Tables 1 to 4 show the elastic modulus E at 49N load at 25 ° C and the heat shrinkage stress ⁇ at 177 ° C of the polyketone fiber cord used for the carcass ply and the reinforcing cord layer.
- the run-flat durability is measured by the drum test under the conditions of a load of 635kgf and a speed of 89km / h without filling the test tire with the internal pressure. Measured and evaluated. Riding comfort was evaluated by the longitudinal panel value of a tire filled with an internal pressure of 230 kPa.
- the side cut performance is set with a tire filled with an internal pressure of 230 kPa tilted 5 ° to the pendulum side with respect to the vertical direction, and this striker convex part is attached to the above tire using a pendulum impact cutting tester.
- the impact energy was calculated and evaluated when the carcass ply was broken and the tire surface was swollen.
- the uniformity was evaluated by the magnitude of force variation (RFV) in the tire radial direction that occurs during one revolution at a constant radius.
- RMV force variation
- the evaluation index of the tire of Comparative Example 1 was set to 100, and an evaluation index for relative evaluation of the tires of Comparative Example 24 and Example 1 to L 1 was calculated.
- the evaluation results are also shown in Tables 1 to 4.
- the evaluation results in Tables 1 to 4 indicate that the run-flat durability distance and side cut performance are higher as the evaluation index is larger, and the performance is higher as other evaluation indices are lower. Show.
- Comparative example Comparative example Comparative example Comparative example 1 2 3 4 Carcass structure 2P H / L 2P H / L IP enve 1P H Power cord material Rayon Polyketone Polycane Polyketone Cord structure (dtex / piece) 1840/2 1670/2 1670/2 1670/2 Number of primary twists X Number of primary twists (times AOcm) 47 X 47 47 X 47 47 X 47 47 X 47 Twist factor 0.82 0.84 0.84 0.84 0.84
- Tire structure Fig. 10 Fig. 10 Fig. 11 Fig. 12 Run flat durability distance 100 100 100 100 100 Maximum gauge of side reinforcing rubber layer 100 86 88 102 Longitudinal spring at normal internal pressure
- Tire weight 100 100 95 93 Side cut 100 131 127 82 Uniformity 100 78 122 82 Table 2
- the carcass Since the carcass has a one-ply structure and does not have a reinforcing cord layer, the maximum gauge of the side reinforcing rubber layer is worse than that of the tire of Comparative Example 1, and the side cut property is also deteriorated. It was.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07767427A EP2042349B1 (en) | 2006-07-19 | 2007-06-22 | Run-flat tire |
CN200780031356XA CN101505977B (zh) | 2006-07-19 | 2007-06-22 | 泄气保用轮胎 |
US12/374,237 US20090320984A1 (en) | 2006-07-19 | 2007-06-22 | Run-flat tire |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006-197086 | 2006-07-19 | ||
JP2006197086A JP4849983B2 (ja) | 2006-07-19 | 2006-07-19 | ランフラットタイヤ |
Publications (1)
Publication Number | Publication Date |
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WO2008010388A1 true WO2008010388A1 (fr) | 2008-01-24 |
Family
ID=38956723
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/062618 WO2008010388A1 (fr) | 2006-07-19 | 2007-06-22 | Pneu à affaissement limité |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090320984A1 (ja) |
EP (1) | EP2042349B1 (ja) |
JP (1) | JP4849983B2 (ja) |
CN (1) | CN101505977B (ja) |
WO (1) | WO2008010388A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2935638A1 (fr) * | 2008-09-09 | 2010-03-12 | Goodyear Tire & Rubber | Bandage pneumatique avec une carcasse renforcee par une nappe a base d'alcool polyvinylique |
WO2010104139A1 (ja) * | 2009-03-11 | 2010-09-16 | 株式会社ブリヂストン | ランフラットタイヤ |
JP2010247669A (ja) * | 2009-04-15 | 2010-11-04 | Bridgestone Corp | タイヤ |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2927845B1 (fr) * | 2008-02-21 | 2010-03-19 | Michelin & Cie | Pneumatique pour roulage a plat pourvu d'une armature supplementaire de flanc. |
JP5315171B2 (ja) * | 2009-08-26 | 2013-10-16 | 株式会社ブリヂストン | ランフラットタイヤ |
US8794283B2 (en) | 2009-10-05 | 2014-08-05 | Bridgestone Corporation | Run-flat tire |
JP6268037B2 (ja) * | 2014-05-19 | 2018-01-24 | 株式会社ブリヂストン | ランフラットラジアルタイヤ |
US10086658B2 (en) * | 2014-10-29 | 2018-10-02 | Bridgestone Corporation | Run-flat tire |
JP6015798B2 (ja) * | 2015-03-26 | 2016-10-26 | 横浜ゴム株式会社 | 空気入りタイヤ |
EP3587142A4 (en) * | 2017-02-22 | 2020-12-30 | Bridgestone Corporation | PNEUMATIC BANDAGE |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2935638A1 (fr) * | 2008-09-09 | 2010-03-12 | Goodyear Tire & Rubber | Bandage pneumatique avec une carcasse renforcee par une nappe a base d'alcool polyvinylique |
WO2010104139A1 (ja) * | 2009-03-11 | 2010-09-16 | 株式会社ブリヂストン | ランフラットタイヤ |
JP2010247669A (ja) * | 2009-04-15 | 2010-11-04 | Bridgestone Corp | タイヤ |
Also Published As
Publication number | Publication date |
---|---|
JP2008024093A (ja) | 2008-02-07 |
EP2042349A4 (en) | 2010-09-01 |
CN101505977A (zh) | 2009-08-12 |
CN101505977B (zh) | 2011-03-23 |
EP2042349A1 (en) | 2009-04-01 |
US20090320984A1 (en) | 2009-12-31 |
EP2042349B1 (en) | 2013-03-13 |
JP4849983B2 (ja) | 2012-01-11 |
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