WO2012066840A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2012066840A1 WO2012066840A1 PCT/JP2011/070103 JP2011070103W WO2012066840A1 WO 2012066840 A1 WO2012066840 A1 WO 2012066840A1 JP 2011070103 W JP2011070103 W JP 2011070103W WO 2012066840 A1 WO2012066840 A1 WO 2012066840A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tire
- bead
- radial direction
- layer
- bead filler
- Prior art date
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Classifications
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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
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
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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
- 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
- B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
- B60C5/142—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre provided partially, i.e. not covering the whole inner wall
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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
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0008—Compositions of the inner liner
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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
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
- B60C15/0603—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead characterised by features of the bead filler or apex
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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
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/28—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers characterised by the belt or breaker dimensions or curvature relative to carcass
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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
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C2013/005—Physical properties of the sidewall rubber
- B60C2013/007—Thickness
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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
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
- B60C2015/009—Height of the carcass terminal portion defined in terms of a numerical value or ratio in proportion to section height
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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
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
- B60C15/0603—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead characterised by features of the bead filler or apex
- B60C2015/061—Dimensions of the bead filler in terms of numerical values or ratio in proportion to section height
Definitions
- the present invention relates to a pneumatic tire, and more particularly, to a pneumatic tire that is highly compatible with weight reduction and steering stability of the tire.
- both ends of the carcass layer are folded back to a position exceeding the maximum tire width, the height of the bead filler from the bead heel is 15 to 30% of the tire cross-sectional height, and the rubber thickness of the sidewall portion
- the weight of the tire can be reduced by forming the inner liner from a thermoplastic resin or a thermoplastic elastomer composition having a Young's modulus of 5 to 50 MPa and a thickness of 0.05 to 0.25 mm. It proposes to achieve both control and handling stability. However, even with a tire configured in this way, the effects of reducing the weight of the tire and improving the steering stability are not always sufficient, and further improvements are required.
- An object of the present invention is to solve the above-described problems, and to provide a pneumatic tire that is highly compatible with weight reduction and steering stability of the tire.
- a pneumatic tire according to the present invention includes a carcass layer mounted between a pair of bead portions, the carcass layer is wound around a bead core embedded in each bead portion, and the bead core is placed on the bead core.
- the height H of the bead filler from a bead heel is set to 10 to 30 mm, and the inner liner layer has a Young's modulus of 70.
- thermoplastic resin having a thickness of 0.05 to 0.25 mm or a thermoplastic elastomer composition obtained by blending a thermoplastic resin component and an elastomer component, and an end portion of the inner liner layer is the bead filler.
- the tire is located on the inner side in the tire radial direction from the outer end in the tire radial direction. That.
- the height H of the bead filler from the bead heel is 10 to 30 mm to reduce the weight of the tire
- the inner liner layer disposed inside the carcass layer has a Young's modulus of 70 to 1500 MPa and a thickness of 0.
- the inner liner layer end portion is arranged on the inner side in the tire radial direction from the outer end portion in the tire radial direction of the bead filler so that the inner liner layer overlaps with the bead filler, the outer end portion in the tire radial direction of the bead filler It is possible to improve the steering stability by reducing the rigidity fluctuation in the engine.
- the carcass layer has a single-layer structure, and the rolled-up end of the carcass layer is disposed on the tire radial inner side from the tire maximum width position and on the tire radial outer side of the bead filler in the tire radial outer end.
- the winding end of the carcass layer is separated from the tire maximum width position by 10 mm or more inward in the tire radial direction, and at least 10 mm away from the tire radial direction outer end of the bead filler in the tire radial direction outside.
- the cross-sectional area of the bead filler in the meridian cross section is 20 to 90 mm 2 and that the bead filler is tapered toward the outer end in the tire radial direction. Thereby, the weight of the tire can be further reduced.
- the end of the inner liner layer is preferably disposed at a position 5 to 20 mm apart from the outer end of the bead filler in the tire radial direction.
- the average rubber thickness of the side rubber layer forming the sidewall portion is 2.0 to 3.5 mm. Thereby, the weight of the tire can be further reduced while maintaining the side cut property of the tire.
- the bead core has a single-winding structure in which one bead wire is wound in an annular shape a plurality of times, and the interval between the bead wires in the meridian section of the bead core is 0.3 mm or less.
- the bending rigidity of a bead part can be made high and steering stability can be improved.
- a reinforcing layer made of a composite material of steel cord or organic fiber cord and rubber on the outer side of the bead filler in the tire width direction and on the inner side of the carcass layer in the tire width direction.
- the tan ⁇ at 60 ° C. of the rubber part including the tire maximum width position of the side rubber layer forming the sidewall part is preferably in the range of 0.02 to 0.10.
- the relationship between the tire cross-sectional width SW and the tire maximum belt width BW is preferably 0.68 ⁇ BW / SW ⁇ 0.80. Thereby, steering stability can be improved more.
- 1 and 2 each show a pneumatic tire according to an embodiment of the present invention.
- a carcass layer 4 is mounted between the pair of left and right bead portions 3 and 3.
- the carcass layer 4 includes a plurality of reinforcing cords extending in the tire radial direction, and is wound up around the bead core 5 disposed in each bead portion 3 from the tire inner side to the outer side.
- a bead filler 6 is disposed on the outer periphery of the bead core 5, and the bead filler 6 is wrapped by the main body portion and the rolled-up portion of the carcass layer 4.
- Layer 10 is provided.
- the height H of the bead filler 6 from the bead heel 3a is set to 10 to 30 mm.
- the quantity of the bead filler 6 can be reduced and a tire can be reduced in weight. If the height H of the bead filler 6 is smaller than 10 mm, an appearance defect that occurs during vulcanization tends to occur, which is problematic from the viewpoint of manufacturing. If the height H of the bead filler 6 is greater than 30 mm, the tire cannot be reduced in weight sufficiently, and rolling resistance decreases.
- the inner liner layer 9 disposed on the inner side of the carcass layer 4 is a thermoplastic resin having a Young's modulus of 70 to 1500 MPa and a thickness of 0.05 to 0.25 mm, or a heat blended with a thermoplastic resin component and an elastomer component. It consists of a plastic elastomer composition. Since the inner liner layer 9 is lightweight, the steering stability can be maintained at a high level by supplementing the circumferential rigidity of the tire without increasing the tire weight.
- the Young's modulus of the inner liner layer 9 is smaller than 70 MPa, the steering stability cannot be maintained at a high level.
- the Young's modulus of the inner liner layer 9 is greater than 1500 MPa, the adhesiveness is insufficient and the durability is lowered.
- the Young's modulus of the inner liner layer 9 is preferably 100 to 1300 MPa, more preferably 200 to 300 MPa.
- the thickness of the inner liner layer 9 is smaller than 0.05 mm, sufficient air permeation preventive properties cannot be obtained. If the thickness of the inner liner layer 9 is larger than 0.25 mm, the rigidity in the tire radial direction becomes too large, and the riding comfort is lowered.
- the thickness of the inner liner layer 9 is preferably 0.10 to 0.20 mm.
- the end portion 9a of the inner liner layer 9 is disposed on the inner side in the tire radial direction from the outer end portion 6a in the tire radial direction of the bead filler 6.
- the end portion 9a of the inner liner layer 9 is preferably disposed at a position 5 to 20 mm away from the tire radial direction outer end portion 6a of the bead filler 6 in the tire radial direction inner side. That is, the overlapping amount in the tire radial direction between the inner liner layer 9 and the bead filler 6 is preferably 5 to 20 mm.
- the overlapping amount of the inner liner layer 9 and the bead filler 6 is smaller than 5 mm, the inner liner layer 9 is easily peeled off and the durability of the tire is lowered.
- the amount of overlap between the inner liner layer 9 and the bead filler 6 is greater than 20 mm, the variation in manufacturing increases, so that the position of the end of the inner liner layer 9 is not stable, and soot and blisters are likely to occur during vulcanization.
- the carcass layer 4 has a single-layer structure, and the winding end 4a of the carcass layer 4 is located on the inner side in the tire radial direction from the tire maximum width position P and on the outer side in the tire radial direction from the tire radial direction outer end portion 6a of the bead filler 6. Has been placed.
- the carcass layer 4 By making the carcass layer 4 into a single layer structure, the tire can be further reduced in weight.
- the winding end 4a of the carcass layer 4 at the above-described position, it is possible to achieve both high weight reduction and steering stability. If the position of the winding end 4a of the carcass layer 4 is disposed outside the tire maximum width position P, the tire cannot be reduced in weight sufficiently.
- the winding end 4a of the carcass layer 4 is separated from the tire maximum width position P by 10 mm or more inward in the tire radial direction, and is separated from the tire radial direction outer end 6a of the bead filler 6 by 10 mm or more in the tire radial direction outside.
- the separation distance from the tire maximum width position P of the winding end 4a of the carcass layer 4 is smaller than 10 mm, the amount of the carcass layer 4 increases, and the tire cannot be sufficiently reduced in weight. If the separation distance from the tire radial direction outer end portion 6a of the bead filler 6 at the winding end 4a of the carcass layer 4 is less than 10 mm, the tire durability is deteriorated.
- the cross-sectional area of the bead filler 6 in the meridian direction cross section is preferably 20 to 90 mm 2 .
- the cross-sectional area of the bead filler 6 is smaller than 20 mm 2, appearance defects that occur during vulcanization are likely to occur.
- the cross-sectional area of the bead filler 6 is larger than 90 mm 2 , the bead filler 6 is too large, so that the tire cannot be sufficiently reduced in weight, and the rolling resistance is reduced.
- the cross-sectional shape of the bead filler 6 is tapered toward the outer end 6a in the tire radial direction.
- the amount of the bead filler 6 can be reduced and the tire can be reduced in weight.
- the shape is not particularly limited as long as it is a tapered shape, but preferably the thickness in the tire width direction at the tire radial direction outer end 6a is 0.3 to 2.0 mm, and the thickness in the tire width direction on the bead core 5 side. It is preferably 4.5 to 10.0 mm.
- the thickness of the bead filler 6 at the outer end 6a in the tire radial direction is smaller than 0.3 mm, the outer end 6a in the tire radial direction of the bead filler 6 becomes too thin and the durability is lowered. If the thickness of the bead filler 6 at the outer end 6a in the radial direction of the tire is larger than 2.0 mm, the amount of the bead filler 6 increases, so that the tire cannot be reduced in weight. If the thickness of the bead filler 6 on the side of the bead core 5 is smaller than 4.5 mm, appearance defects that occur during vulcanization are likely to occur. If the thickness of the bead filler 6 on the bead core 5 side is larger than 10.0 mm, the amount of the bead filler 6 increases, so that the weight of the tire cannot be sufficiently reduced.
- the bead filler 6 preferably has a hardness of 80 to 95. If the hardness of the bead filler is less than 80, the steering stability is lowered. If the hardness of the bead filler is greater than 95, the ride comfort is reduced.
- the hardness of the bead filler is a hardness measured using a type A durometer at 20 ° C. in accordance with a durometer hardness test specified in JIS K6253.
- the average rubber thickness of the side rubber layer forming the sidewall portion 2 is 2.0 to 3.5 mm. If the average rubber thickness of the sidewall portion 2 is less than 2.0 mm, the side cut resistance is insufficient and the durability of the tire is lowered. If the average rubber thickness of the sidewall portion 2 is greater than 3.5 mm, the tire cannot be sufficiently reduced in weight.
- the average rubber thickness of the side rubber layer forming the sidewall portion 2 means an average rubber thickness in a range of 20 to 75% of the tire cross-section height SH, and is as follows. Ask. As shown in FIG. 3, the surface of the sidewall portion 2 is divided into 10 equal parts along the radial direction, and the minimum values g 1 to g 10 of the rubber thickness in each divided section are measured. In this case, if the concave portion 11 of dimple or the like on the surface of the sidewall portion 2 is formed to measure the minimum value of the rubber thickness including the recess 11 in each divided section (see g 1 in FIG. 3). An average value G of the ten measured values g 1 to g 10 measured in this way is obtained.
- this average value G is obtained at any four locations on the circumference of the tire, and the average value of the average values G 1 to G 4 at these four locations is defined as the average rubber thickness of the side rubber layer forming the sidewall portion 2.
- the tire cross-section height SH is set to a value that is 1 ⁇ 2 of the difference between the tire outer diameter and the rim diameter measured according to JATMA Yearbook.
- the structure of the bead core 5 is not particularly limited.
- the bead core 5 has a single-winding structure formed by winding a single bead wire 5a in a ring shape, and the circumference of the bead wire 5a in the meridional section of the bead core 5 Is preferably set to 0.3 mm or less.
- surroundings part of the bead wire 5a should just be 0.3 mm or less, and you may contact partially on a tire periphery. If the mutual interval between the circumferential portions of the bead wires 5a is larger than 0.3 mm, the effect of improving the steering stability becomes insufficient.
- a steel wire having a diameter of 1.2 to 1.4 mm is used as the bead core 5 and the circumferential portion thereof is arranged in 4 to 6 rows in the tire width direction, and 3 to 5 layers are stacked in the tire radial direction.
- the tire can be reduced in weight while maintaining high durability and steering stability of the tire. If the diameter of the steel wire is smaller than 1.2 mm, the effect of improving the steering stability becomes insufficient. If the diameter of the steel wire is larger than 1.4 mm, the effect of reducing the weight becomes insufficient.
- a reinforcing layer 10 made of a composite material of steel cord or organic fiber cord and rubber is provided on the outer side in the tire width direction of the bead filler 6 and on the inner side in the tire width direction of the carcass layer 4 as shown in FIG. preferable.
- the circumferential rigidity of the tire can be improved and the steering stability can be improved.
- the weight of the tire is slightly increased, but the weight of the tire can be sufficiently reduced with respect to a conventional tire having a large bead filler.
- the height h of the reinforcing layer 10 from the bead heel of the tire radial direction outer end portion 10a is preferably 20 to 35 mm. If the height h of the reinforcing layer 10 is smaller than 20 mm, the steering stability cannot be sufficiently improved. When the height h of the reinforcing layer 10 is larger than 35 mm, the rolling resistance is deteriorated.
- the organic fiber cord forming the reinforcing layer an aramid fiber cord, a nylon cord, a rayon cord or the like can be preferably used as the organic fiber cord forming the reinforcing layer.
- the reinforcing cord of the reinforcing layer 10 is preferably inclined by 10 to 30 ° with respect to the tire radial direction. If the inclination angle of the reinforcing cord is smaller than 10 °, it is difficult to manufacture the tire. If the inclination angle of the reinforcing cord exceeds 30 °, the steering stability cannot be improved sufficiently.
- the tan ⁇ at 60 ° C. of the rubber portion including the tire maximum width position of the side rubber layer forming the sidewall portion 2 is preferably in the range of 0.02 to 0.10.
- tan ⁇ at 60 ° C. of the side rubber layer is preferably in the range of 0.02 to 0.10.
- heat generation of the side wall portion 2 can be suppressed and rolling resistance can be reduced.
- tan ⁇ is greater than 0.10, the effect of suppressing the heat generation of the sidewall portion 2 cannot be sufficiently obtained. If this tan ⁇ is smaller than 0.02, the durability of the tire is deteriorated.
- tan ⁇ at 60 ° C. of the side rubber layer can be appropriately adjusted depending on the blending amount of the rubber constituting the side rubber layer and carbon black. For example, by blending 75 parts by weight of natural rubber, 25 parts by weight of butadiene rubber, and 25 parts by weight of carbon black, a rubber composition having a tan ⁇ at 60 ° C. of 0.02 can be obtained. By blending 45 parts by weight of natural rubber, 55 parts by weight of butadiene rubber, and 35 parts by weight of carbon black, a rubber composition having a tan ⁇ of 0.06 at 60 ° C. can be obtained.
- a rubber composition having a tan ⁇ of 0.10 at 60 ° C. can be obtained. In this way, tan ⁇ at 60 ° C. of the side rubber layer can be determined.
- the relationship between the tire cross-sectional width SW and the tire maximum belt width BW is 0.68 ⁇ BW / SW ⁇ 0.80. If BW / SW is smaller than 0.68, the effect of improving the steering stability cannot be sufficiently obtained. When BW / SW is larger than 0.80, rolling resistance is deteriorated.
- FIG. 4 is an enlarged view of a part of the sidewall portion 2 in the pneumatic tire of the present invention.
- the rigidity of the inner liner layer 9 made of a thermoplastic resin or a thermoplastic elastomer composition is used to supplement the steering stability.
- the rigidity increasing effect based on the inner liner layer 9 is maximized.
- D is preferably 1/5 to 1/3.
- thermoplastic resin constituting the inner liner layer 9 in the present invention examples include polyamide resins [for example, nylon 6 (N6), nylon 66 (N66), nylon 46 (N46), nylon 11 (N11), nylon 12 (N12), nylon 610 (N610), nylon 612 (N612), nylon 6/66 copolymer (N6 / 66), nylon 6/66/610 copolymer (N6 / 66/610), nylon MXD6 (MXD6 ), Nylon 6T, nylon 6 / 6T copolymer, nylon 66 / PP copolymer, nylon 66 / PPS copolymer] and their N-alkoxyalkylated products (for example, methoxymethylated products of nylon 6, nylon 6 / 610 copolymer methoxymethylated product, nylon 612 methoxymethylated product], poly Ester resin [for example, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene isophthalate (PEI),
- thermoplastic elastomer composition constituting the inner liner layer 9 can be constituted by blending the above-described thermoplastic resin and elastomer.
- elastomer constituting the thermoplastic elastomer composition examples include diene rubbers and hydrogenated products thereof [eg, natural rubber (NR), isoprene rubber (IR), epoxidized natural rubber, styrene butadiene rubber (SBR), butadiene] Rubber (BR, high cis BR and low cis BR), nitrile rubber (NBR), hydrogenated NBR, hydrogenated SBR], olefin rubber [for example, ethylene propylene rubber (EPDM, EPM), maleic acid modified ethylene propylene rubber ( M-EPM), butyl rubber (IIR), isobutylene and aromatic vinyl or diene monomer copolymer, acrylic rubber (ACM), ionomer], halogen-containing rubber [eg, Br-IIR, Cl-IIR, isobutylene paramethylstyrene Copolymer bromide (Br-IPMS), Loprene rubber (CR), hydrin rubber (CHR), chloro
- the composition ratio between the specific thermoplastic resin and the elastomer is not particularly limited, and is appropriately determined so as to have a structure in which the elastomer is dispersed as a discontinuous phase in the thermoplastic resin matrix.
- a preferred range is a weight ratio of 10/90 to 90/10, more preferably 20/80 to 85/15.
- the thermoplastic elastomer composition can have sufficient flexibility and rigidity for the inner liner by adopting a form in which the thermoplastic resin forms a continuous phase (matrix) and the elastomer becomes a dispersed phase (domain). At the same time, molding processability equivalent to that of a thermoplastic resin can be obtained during molding regardless of the amount of elastomer.
- compatibilizing agent a thermoplastic resin and an elastomer, a copolymer having one or both structures, or an epoxy group, a carbonyl group, a halogen group, an amino group, an oxazoline group, a hydroxyl group, etc. that can react with the thermoplastic resin or elastomer It can assume the structure of a copolymer having These may be selected depending on the type of thermoplastic resin and elastomer to be mixed.
- the blending amount of such a compatibilizing agent is not particularly limited, but is preferably 0.5 to 10 parts by weight with respect to 100 parts by weight of the polymer component (the total of the thermoplastic resin and the elastomer).
- a thermoplastic resin or a thermoplastic elastomer composition generally includes a filler (calcium carbonate, titanium oxide, alumina, etc.), a reinforcing agent such as carbon black and white carbon, a softener, a plasticizer, etc.
- a filler calcium carbonate, titanium oxide, alumina, etc.
- a reinforcing agent such as carbon black and white carbon
- a softener such as a softener
- plasticizer a plasticizer
- Agents, processing aids, pigments, dyes, anti-aging agents, and the like can be arbitrarily added as long as the necessary properties as an inner liner are not impaired.
- the tire size is the same for 195 / 65R15, the Young's modulus of the inner liner layer, the thickness of the inner liner layer, the height H of the bead filler from the bead heel, the cross-sectional area of the bead filler, the shape of the bead filler, the tire at the end of the carcass Separation distance from large position, separation distance from bead filler end of carcass end, overlap amount of inner liner layer and bead filler, average rubber thickness of side wall, bead core wire spacing, bead filler and carcass layer
- Conventional example 1 comparative example 1 in which the presence / absence of a reinforcing layer between them, the tan ⁇ of rubber in the sidewall portion, and the ratio BW / SW of the tire cross-sectional width SW and the tire maximum belt width BW were set as shown in Tables 1 to 4, respectively. 21 types of tires of Examples 1 to 19 were manufactured.
- the separation distance from the tire maximum width position at the carcass end is shown with the separation distance to the inside in the tire radial direction being positive and the separation distance to the outside in the tire radial direction being negative.
- the carcass end is wound up from the tire maximum width position to the outside in the tire radial direction, and therefore, the separation distance from the tire maximum width position of the carcass end is set to a negative value.
- the test tire is assembled to a wheel with a rim size of 15 x 6 J, the front tire pressure is 230 kPa, the rear tire pressure is 220 kPa, and it is installed on a domestic hybrid vehicle with a displacement of 1.8 L.
- Five test drivers test Feeling evaluation of the handling stability when going around the course, and the average value was obtained. The evaluation results are shown as an index with Conventional Example 1 as 100. The larger the index value, the better the steering stability.
- Rolling resistance The rolling resistance of the test tire was measured under the conditions of an air pressure of 210 kPa, a load of 4.82 kN, and a speed of 80 km / h using a drum testing machine having a drum diameter of 1707.6 mm in accordance with ISO28580.
- the evaluation results are shown as an index with the conventional example 1 as 100, using the reciprocal of the measured value. It means that rolling resistance is so low that this index value is large.
- Tire Weight The weight of the test tire was measured. The evaluation results are shown as an index with the conventional example 1 as 100, using the reciprocal of the measured value. A larger index value means a lighter tire weight.
- Comparative Example 1 having a low Young's modulus of the inner liner layer was able to reduce rolling resistance and tire weight, but the steering stability was deteriorated.
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Abstract
Description
試験タイヤをリムサイズ15×6Jのホイールに組み付けて、フロントタイヤの空気圧を230kPa、リアタイヤの空気圧を220kPaにし、排気量1.8Lクラスの国産ハイブリット車に取り付け、5名のテストドライバーがテストコースを周回する際の操縦安定性をフィーリング評価し、その平均値を求めた。評価結果は、従来例1を100とする指数にて示した。この指数値が大きいほど操縦安定性が優れていることを意味する。
試験タイヤを、ISO28580に準拠して、ドラム径1707.6mmのドラム試験機を用い、空気圧210kPa、荷重4.82kN、速度80km/hの条件で転がり抵抗を測定した。評価結果は、測定値の逆数を用い、従来例1を100とする指数にて示した。この指数値が大きいほど転がり抵抗が低いことを意味する。
試験タイヤの重量を測定した。評価結果は測定値の逆数を用い、従来例1を100とする指数にて示した。この指数値が大きいほどタイヤ重量が軽量であることを意味する。
2 サイドウォール部
3 ビード部
3a ビードヒール
4 カーカス層
4a 巻き上げ端
5 ビードコア
6 ビードフィラー
6a タイヤ径方向端部
7 ベルト層
8 ベルト補強層
9 インナーライナー層
9a 端部
10 補強層
P タイヤ最大幅位置
SH タイヤ断面高さ
SW タイヤ断面幅
BW タイヤ最大ベルト幅
Claims (10)
- 一対のビード部間にカーカス層を装架し、該カーカス層を各ビード部に埋設されたビードコアの周りに巻き上げ、該ビードコア上にビードフィラーを配置すると共に、前記カーカス層の内側にインナーライナー層を配置した空気入りタイヤにおいて、
前記ビードフィラーのビードヒールからの高さHを10~30mmにすると共に、前記インナーライナー層をヤング率が70~1500MPaで、厚さが0.05~0.25mmの熱可塑性樹脂又は熱可塑性樹脂成分とエラストマー成分とをブレンドした熱可塑性エラストマー組成物により構成し、前記インナーライナー層の端部が前記ビードフィラーのタイヤ径方向外側端部よりタイヤ径方向内側に位置するようにしたことを特徴とする空気入りタイヤ。 - 前記カーカス層を単層構造とすると共に、前記カーカス層の巻き上げ端をタイヤ最大幅位置よりタイヤ径方向内側かつ前記ビードフィラーのタイヤ径方向外側端部よりタイヤ径方向外側に配置したことを特徴とする請求項1に記載の空気入りタイヤ。
- 前記カーカス層の巻き上げ端をタイヤ最大幅位置からタイヤ径方向内側に10mm以上離間させると共に、前記ビードフィラーのタイヤ径方向外側端部からタイヤ径方向外側に10mm以上離間させたことを特徴とする請求項2に記載の空気入りタイヤ。
- 前記ビードフィラーの子午線方向断面における断面積を20~90mm2 にすると共に、前記ビードフィラーの形状をタイヤ径方向外側端部に向かい先細りの形状にしたことを特徴とする請求項1,2又は3に記載の空気入りタイヤ。
- 前記インナーライナー層の端部を前記ビードフィラーのタイヤ径方向外側端部からタイヤ径方向内側に5~20mm離間した位置に配置したことを特徴とする請求項1~4のいずれかに記載の空気入りタイヤ。
- サイドウォール部を形成するサイドゴム層の平均ゴム厚さを2.0~3.5mmにしたことを特徴とする請求項1~5のいずれかに記載の空気入りタイヤ。
- 前記ビードコアを1本のビードワイヤを環状に複数回巻回してなる1本巻き構造にすると共に、前記ビードコアの子午線方向断面における前記ビードワイヤの周回部分の相互間隔を0.3mm以下にしたことを特徴とする請求項1~6のいずれかに記載の空気入りタイヤ。
- 前記ビードフィラーのタイヤ幅方向外側かつ前記カーカス層のタイヤ幅方向内側に、スチールコード又は有機繊維コードとゴムの複合材からなる補強層を設けたことを特徴とする請求項1~7のいずれかに記載の空気入りタイヤ。
- サイドウォール部を形成するサイドゴム層のタイヤ最大幅位置を含むゴム部分の60℃におけるtanδを0.02~0.10の範囲にしたことを特徴とする請求項1~8のいずれかに記載の空気入りタイヤ。
- タイヤ断面幅SWとタイヤ最大ベルト幅BWとの関係が0.68≦BW/SW≦0.80であることを特徴とする請求項1~9のいずれかに記載の空気入りタイヤ。
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DE112011103798T DE112011103798T9 (de) | 2010-11-17 | 2011-09-05 | Luftreifen |
US13/885,997 US20130240107A1 (en) | 2010-11-17 | 2011-09-05 | Pneumatic Tire |
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JP2010257182A JP4915471B1 (ja) | 2010-11-17 | 2010-11-17 | 空気入りタイヤ |
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WO2018193700A1 (ja) * | 2017-04-17 | 2018-10-25 | 横浜ゴム株式会社 | 空気入りタイヤ |
CN109982864A (zh) * | 2016-11-22 | 2019-07-05 | 横滨橡胶株式会社 | 充气轮胎 |
WO2019159892A1 (ja) * | 2018-02-14 | 2019-08-22 | 横浜ゴム株式会社 | 空気入りタイヤ |
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WO2013088570A1 (ja) * | 2011-12-16 | 2013-06-20 | コンパニー ゼネラール デ エタブリッスマン ミシュラン | 空気入りタイヤ用トレッド |
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JP7163119B2 (ja) * | 2018-09-21 | 2022-10-31 | 横浜ゴム株式会社 | タイヤ用インナーライナーおよび空気入りタイヤ |
JP7163118B2 (ja) * | 2018-09-21 | 2022-10-31 | 横浜ゴム株式会社 | タイヤ用インナーライナーおよび空気入りタイヤ |
JP7135940B2 (ja) * | 2019-02-28 | 2022-09-13 | 横浜ゴム株式会社 | 空気入りタイヤ |
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FR3107205B1 (fr) * | 2020-02-19 | 2022-02-11 | Michelin & Cie | Pneumatique a faible hauteur de flanc |
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DE112011103798T5 (de) | 2013-08-14 |
DE112011103798T9 (de) | 2013-12-24 |
JP2012106625A (ja) | 2012-06-07 |
JP4915471B1 (ja) | 2012-04-11 |
CN103221233A (zh) | 2013-07-24 |
US20130240107A1 (en) | 2013-09-19 |
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