WO2011099635A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2011099635A1 WO2011099635A1 PCT/JP2011/053184 JP2011053184W WO2011099635A1 WO 2011099635 A1 WO2011099635 A1 WO 2011099635A1 JP 2011053184 W JP2011053184 W JP 2011053184W WO 2011099635 A1 WO2011099635 A1 WO 2011099635A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- belt layer
- cord
- pneumatic tire
- circumferential
- cords
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 63
- 239000010959 steel Substances 0.000 claims abstract description 63
- 239000011324 bead Substances 0.000 claims abstract description 14
- 230000002093 peripheral effect Effects 0.000 claims abstract description 13
- 239000010410 layer Substances 0.000 abstract description 74
- 239000000446 fuel Substances 0.000 abstract description 15
- 239000002356 single layer Substances 0.000 abstract description 3
- 239000002184 metal Substances 0.000 description 9
- 239000013585 weight reducing agent Substances 0.000 description 9
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 239000004760 aramid Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 239000012783 reinforcing fiber Substances 0.000 description 2
- 229920000271 Kevlar® Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000004761 kevlar Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
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
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
- B60C9/2204—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre obtained by circumferentially narrow strip winding
-
- 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
- B60C9/0064—Reinforcements comprising monofilaments
-
- 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
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/2003—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords
- B60C9/2006—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords consisting of steel cord plies only
-
- 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
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/2003—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords
- B60C9/2009—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords comprising plies of different materials
-
- 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
-
- 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
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2074—Physical properties or dimension of the belt cord
- B60C2009/2077—Diameters of the cords; Linear density thereof
-
- 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
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2074—Physical properties or dimension of the belt cord
- B60C2009/2083—Density in width direction
- B60C2009/2087—Density in width direction with variable density in the same layer
-
- 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
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
- B60C2009/2252—Physical properties or dimension of the zero degree ply cords
- B60C2009/2257—Diameters of the cords; Linear density thereof
-
- 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
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
- B60C2009/2252—Physical properties or dimension of the zero degree ply cords
- B60C2009/2266—Density of the cords in width direction
-
- 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
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
- B60C2009/2252—Physical properties or dimension of the zero degree ply cords
- B60C2009/2285—Twist structures
Definitions
- the present invention relates to a pneumatic tire (hereinafter, also simply referred to as “tire”), and more particularly, to a pneumatic tire capable of achieving weight reduction and fuel saving while ensuring durability.
- Patent Documents 1 to 5 disclose that a single inclined steel belt layer is used as a tire that is easy to manufacture because of its simple structure, is lightweight, and has low rolling resistance.
- a pneumatic radial tire is disclosed that includes at least one circumferential steel belt layer disposed on the inclined steel belt layer and in which a plurality of cords are arranged substantially parallel to the circumferential direction of the tire.
- Patent Document 6 for the purpose of improving fuel consumption and riding comfort, a bundle of four or five metal filaments (monofilaments) arranged in the width direction of the belt without being twisted and aligned is used as a unit.
- a pneumatic radial tire provided with an embedded belt has been proposed.
- Patent Document 7 a metal monofilament of the belt layer is predetermined in the belt ply width direction in order to meet the needs for weight reduction of tires and to solve problems such as a decrease in durability due to breakage of metal wires.
- a pneumatic radial tire composed of three belt plies arranged under conditions and embedded in a coated rubber has been proposed.
- Patent Documents 8 and 9 disclose belt structures in which metal monofilament cords are arranged in parallel.
- JP 2002-019414 A Japanese Patent No. 3071808 (Japanese Patent Laid-Open No. 4-78602, claims, etc.) JP 2001-206010 A (Claims etc.) Japanese Patent No. 4054072 (Japanese Patent Laid-Open No. 8-318706, claims, etc.) JP 2007-161026 (Claims etc.) Japanese Patent No. 2713806 (Japanese Patent Laid-Open No. 4-95505, Examples) JP 2002-283809 A (Claims etc.) JP-A-2005-349999 (Claims etc.) JP 2007-302203 A (Claims etc.)
- an object of the present invention is to provide a pneumatic tire capable of achieving weight reduction and fuel saving while ensuring durability.
- the pneumatic tire of the present invention has a carcass extending in a toroidal shape across a pair of bead cores embedded in a pair of left and right bead portions, and is disposed on the outer peripheral side of the crown portion of the carcass.
- a single inclined steel belt layer formed by arranging a plurality of cords extending obliquely with respect to the tire circumferential direction, and disposed on the outer peripheral side of the inclined steel belt layer, and substantially parallel to the tire circumferential direction
- a pneumatic tire provided with one circumferential belt layer formed by arranging a plurality of cords in
- the cords of the inclined steel belt layer are juxtaposed in the belt width direction with a bundle of a plurality of steel filaments arranged as a unit, and the cord of the circumferential belt layer twists a plurality of filaments to form a belt width. It is characterized by being juxtaposed in the direction.
- the wire diameter D1 of the filament constituting the cord of the circumferential belt layer and the wire diameter D2 of the steel filament constituting the cord of the inclined steel belt layer are expressed by the following formula (1), D1 ⁇ D2 (1) It is preferable to satisfy the relationship represented by:
- the cord of the circumferential belt layer is preferably composed of 5 to 15 filaments.
- an interval A1 between the cords of the inclined steel belt layer and an interval A2 between the cords of the circumferential belt layer are expressed by the following formula (2), A1> A2 (2)
- the inclined angle of the inclined steel belt layer is preferably 40 to 60 ° with respect to the circumferential direction.
- a width B1 of the circumferential belt layer in the belt width direction and a width B2 of the inclined steel belt layer in the belt width direction are expressed by the following formula (3): 0.8 ⁇ B2 ⁇ B1 ⁇ 0.95 ⁇ B2 (3) It is preferable to satisfy the relationship represented by: Furthermore, the cord of the inclined steel belt layer is preferably composed of 3 to 6 steel filaments.
- FIG. 1 is a half sectional view of a pneumatic tire according to an embodiment of the present invention. It is a top view which shows the reinforcement structure of the tread part of the pneumatic tire of this invention. It is an expanded sectional view of the tread part of the pneumatic tire of the present invention. It is a schematic sectional drawing which shows the cord structure of the circumferential belt layer which can be used suitably for this invention.
- FIG. 1 is a half sectional view of a pneumatic tire according to an embodiment of the present invention.
- the illustrated pneumatic tire 10 has a carcass 2 extending in a toroidal shape across a pair of bead cores 1 embedded in a pair of left and right bead portions 11, and is disposed on the outer peripheral side of the crown portion of the carcass 2.
- a circumferential belt layer 4 having a plurality of cords arranged in parallel to each other.
- the reinforcement structure of the tread part 13 in the pneumatic tire of this invention is extracted and shown.
- the conventional belt reinforcing layer becomes unnecessary, and by using the inclined steel belt layer 3 and the circumferential belt layer 4 as two layers.
- the weight of the tire can be significantly reduced.
- the belt structure is simplified, fuel consumption can be reduced.
- FIG. 3 is an enlarged cross-sectional view of the tread portion 13 of the pneumatic tire of the present invention.
- the cords 5 of the inclined steel belt layer 3 are juxtaposed in the belt width direction with a bundle of a plurality of steel filaments (five in the illustrated example) arranged together, and It is important that the cord 6 of the directional belt layer 4 is formed by twisting a plurality of filaments (five in the illustrated example) and juxtaposing them in the belt width direction.
- the cords 5 of the inclined steel belt layer 3 are juxtaposed in the belt width direction in units of a bundle in which a plurality of steel filaments are aligned, so that the coating rubber gauge of the inclined steel belt layer 3 can be made thin. As a result, further weight reduction of the tire can be realized.
- the number of cords 5 driven in the inclined steel belt layer 3 is preferably 15 to 30 bundles / 50 mm from the viewpoint of reinforcing performance and the like.
- the cord 6 of the circumferential belt layer 4 is not particularly limited as long as it is formed by twisting a plurality of filaments.
- the circumferential belt layer 4 needs to expand and contract with respect to internal pressure growth and deformation due to load. If the cord 6 of the circumferential belt layer 4 cannot expand and contract, the filament may be cut by compression. Therefore, the cord 6 of the circumferential belt layer 4 needs to be a twisted cord. From the viewpoint of manufacturability and strength of the twisted cord, the cord 6 of the circumferential belt layer 4 is preferably composed of 5 to 15 filaments.
- the cord 6 of the circumferential belt layer 4 is preferably formed by twisting a plurality of steel filaments having a tensile strength of 2700 N / mm 2 or more and viewed from a cross section in the tire width direction as shown in FIG. It is preferable that the cross-sectional shape of the cord 6 of the circumferential belt layer 4 at the time exhibits a C shape having an opening 8 in a part between the steel filaments 7.
- the use of the twisted cord 6 having a cross-sectional shape having a gap in a part between the steel filaments 7 for the circumferential belt layer 4 increases the belt cord deformation tolerance with respect to compression and tensile deformation, and the tire ground contact. Even when compression is applied in the tire circumferential direction, the belt cord does not buckle, and a tagging effect can be generated. Further, in the case of a cord having no gap between the steel filaments 7, since there is little deformation allowance of the cord at the time of tire molding (at the time of shaping), there is a high possibility of molding defects such as separation on the belt joining surface.
- the cord as shown in FIG. 4 has a large deformation tolerance, it can be formed without reducing the number of the cords, and the tire can be manufactured without reducing the durability of the tire. Therefore, by making the cord structure of the circumferential belt layer 4 as described above, it is possible to obtain a pneumatic tire that is not easily broken during compression, has good initial elongation, and has good tensile strength and manufacturability. it can.
- the cord center angle ⁇ of the opening 8 is preferably 30 to 100 °. If the cord center angle ⁇ of the opening 8 is too small, that is, if the opening 8 is too narrow, the initial elongation may be reduced. On the other hand, if the cord center angle ⁇ of the opening 8 is too large, that is, if the opening 8 is too wide, the twisted cord is likely to be cut and tire durability may be reduced.
- the diameter D3 of the cord 6 of the circumferential belt layer 4 is preferably 4 to 8 times the wire diameter D1 of the steel filament 7.
- the diameter D3 of the cord 6 is too small, that is, when the steel filament 7 is twisted too tightly, the cord is easily broken by compression, and the initial elongation is also reduced.
- the diameter D3 of the cord 6 is too large, that is, if the steel filament 7 is twisted too loosely, the steel filament 7 tends to fall apart, and the tensile strength of the cord decreases.
- the circumferential belt layer 4 is usually formed by spirally winding a belt-like belt member in the tire circumferential direction, and therefore has a slight inclination angle with respect to the tire equator line.
- the number of cords 6 driven in the circumferential belt layer 4 is preferably 25 to 45/50 mm from the viewpoint of reinforcement.
- a steel filament can be used, but is not limited thereto, and a high tension organic fiber may be used.
- the high-strength organic fibers include organic fibers such as polyamide (nylon (registered trademark)) and aramid fibers (Kevlar (registered trademark)).
- the filament diameter D1 constituting the cord 6 of the circumferential belt layer 4 and the filament diameter D2 constituting the cord 5 of the inclined steel belt layer 3 are expressed by the following formula (1), D1 ⁇ D2 (1) Is preferably satisfied (see FIG. 3). This is because the cord 6 of the circumferential belt layer 4 twists a plurality of filaments, so that the effect of the present invention can be obtained even if the wire diameter per filament is small.
- the wire diameter D1 is 0.13 to 0.25 mm, and D2 is 0.18 to 0.35 mm.
- an interval A1 between the cords 5 of the inclined steel belt layer 4 and an interval A2 between the cords 6 of the circumferential belt layer 4 are expressed by the following formula (2), A1> A2 (2) Is preferably satisfied (see FIG. 3). This is because in order to ensure the circumferential rigidity, it is preferable to make the number of driving of the circumferential belt layer 4 dense.
- A1 is 1.0 to 2.0 mm
- A2 is 0.5 to 1.2 mm.
- the inclined steel belt layer 3 preferably has an inclination angle of 40 to 60 ° with respect to the circumferential direction.
- the amount of shear deformation is minimized when the angle of the reinforcing fibers is 54 °. That is, when the belt angle is 54 ° with respect to the circumferential direction, the inclined steel belt layer 3 has the smallest shrinkage and the rolling resistance can be reduced, and thus the above range is preferable.
- the width B1 of the circumferential belt layer 4 in the belt width direction and the width B2 of the inclined steel belt layer 3 in the belt width direction are expressed by the following formula (3): 0.8 ⁇ B2 ⁇ B1 ⁇ 0.95 ⁇ B2 (3) Is preferably satisfied (see FIG. 2). This is because the circumferential belt layer 4 is preferably narrower in order to ensure high-speed durability of the belt portion.
- the cord 5 of the inclined steel belt layer 3 is preferably composed of 3 to 6 steel filaments.
- the cord 5 of the inclined steel belt layer 3 is juxtaposed in the belt width direction with a bundle of a plurality of steel filaments aligned
- the cord 6 of the circumferential belt layer 4 is a plurality of cords. It is important that the filaments are twisted and juxtaposed in the belt width direction, and other details of the tire configuration can be appropriately configured according to a conventional method, and are not particularly limited.
- the tire shown in FIG. 1 includes a tread portion 13 and a pair of sidewall portions 12 and bead portions 11 that are continuous on both sides thereof.
- the carcass 2 includes a pair of these portions embedded in the bead portion 11.
- the bead core 1 is reinforced.
- cords of various organic fibers such as nylon, polyester, rayon or aromatic polyamide can be used.
- the carcass 2 needs to be arranged in at least one layer, but may be arranged in two or more layers, and is usually folded around the bead core 1 from the inside of the tire to the outside and locked.
- a tread pattern is appropriately formed on the surface of the tread portion, and an inner liner (not shown) is formed on the innermost layer.
- an inert gas such as nitrogen can be used as the gas filled in the tire.
- the pneumatic tire of the present invention is improved in weight reduction and fuel saving while ensuring durability.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
前記傾斜スチールベルト層のコードが、スチールフィラメントの複数本を引き揃えた束を単位としてベルト幅方向に並置され、かつ、前記周方向ベルト層のコードが、複数本のフィラメントを撚り合わせてベルト幅方向に並置されてなることを特徴とするものである。
D1<D2 (1)
で表わされる関係を満足することが好ましい。また、前記周方向ベルト層のコードは、5~15本のフィラメントからなることが好ましい。さらに、前記傾斜スチールベルト層のコード同士の間隔A1と、前記周方向ベルト層のコード同士の間隔A2とが下記式(2)、
A1>A2 (2)
で表わされる関係を満足することが好ましい。さらにまた、前記傾斜スチールベルト層の傾斜角度は、周方向に対して40~60°であることが好ましい。さらにまた、前記周方向ベルト層のベルト幅方向の幅B1と、前記傾斜スチールベルト層のベルト幅方向の幅B2とが下記式(3)、
0.8×B2<B1<0.95×B2 (3)
で表わされる関係を満足することが好ましい。さらにまた、前記傾斜スチールベルト層のコードは、3~6本のスチールフィラメントからなることが好ましい。
図1は、本発明の一実施の形態に係る空気入りタイヤの片側断面図である。図示する空気入りタイヤ10は、左右一対のビード部11にそれぞれ埋設された一対のビードコア1間に跨ってトロイド状に延在するカーカス2を骨格とし、カーカス2のクラウン部の外周側に配設され、タイヤ周方向に対し傾斜して延びる複数本のコードを配列してなる1層の傾斜スチールベルト層3と、傾斜スチールベルト層3の外周側に配設され、タイヤ周方向に対し実質的に平行に複数本のコードを配列してなる1層の周方向ベルト層4と、を備える。図2に、本発明の空気入りタイヤにおけるトレッド部13の補強構造を抜き出して示す。傾斜スチールベルト層3と周方向ベルト層4とからなる補強構造を用いることで、従来のベルト補強層が不要となり、また、傾斜スチールベルト層3と周方向ベルト層4の2層とすることにより、さらに大幅にタイヤの軽量化が可能となる。さらに、ベルト構造が簡素化されるため、省燃費化を図ることができる。
D1<D2 (1)
で表わされる関係を満足することが好ましい(図3参照)。周方向ベルト層4のコード6はフィラメント複数本を撚り合わせるため、フィラメント1本当たりの線径は細くても、本発明の効果を得ることができるためである。好ましくは、線径D1は0.13~0.25mm、D2は0.18~0.35mmである。
A1>A2 (2)
で表わされる関係を満足することが好ましい(図3参照)。周方向剛性を確保するためには周方向ベルト層4の打ち込み数を密にする方が好ましいためである。好ましくは、A1は1.0~2.0mm、A2は0.5~1.2mmである。
0.8×B2<B1<0.95×B2 (3)
で表わされる関係を満足することが好ましい(図2参照)。ベルト部の高速耐久性を確保するためには、周方向ベルト層4の方が狭い方が好ましいためである。
(比較例1、2および実施例1~4)
図1に示すような、1層のカーカス2のクラウン部の外周側に順次、第1ベルト層3と、第2ベルト層4とを備える空気入りタイヤを、タイヤサイズ195/65R15にて作製した。ベルト構造の詳細を下記表1に示す。得られた各供試タイヤにつき、下記に従い評価を行った。
各供試タイヤをJATMAで規定する正規リムに組み付け、280kPaの内圧を充填し、ドラムにタイヤを任意の力で押し付けて、ドラムの任意の周速から段階的に速度を増加しつつ、各速度を任意の時間維持した場合の故障発生速度を記録し、比較例1のタイヤの故障時の速度を基準として、速度差を算出した。得られた結果を表1に併記する。
各供試タイヤの重量をそれぞれ測定し、比較例1のタイヤの重量を基準として、タイヤの重量差を算出した。得られた結果を表1に併記する。
各供試タイヤの省燃費性の指標として、SAE J 1269に準拠して、低転がり抵抗を転動抵抗試験機を用いて測定した。比較例1を基準として、それよりも極めて優れている場合を◎、優れている場合を○、同等の場合を△、劣っている場合を×として評価した。得られた結果を表1に併記する。
各供試タイヤの総合評価として、比較例1を基準として、それよりも極めて良好である場合を◎、良好である場合を○、同等である場合を△、劣っている場合を×として評価した。得られた結果を表1に併記する。
2 カーカス
3 傾斜スチールベルト層
4 周方向ベルト層
5 傾斜スチールベルト層のコード
6 周方向ベルト層のコード
7 スチールフィラメント
8 開口部
10 空気入りタイヤ
11 ビード部
12 サイドウォール部
13 トレッド部
Claims (7)
- 左右一対のビード部にそれぞれ埋設された一対のビードコア間に跨ってトロイド状に延在するカーカスを骨格とし、該カーカスのクラウン部の外周側に配設され、タイヤ周方向に対し傾斜して延びる複数本のコードを配列してなる1層の傾斜スチールベルト層と、該傾斜スチールベルト層の外周側に配設され、タイヤ周方向に対し実質的に平行に複数本のコードを配列してなる1層の周方向ベルト層と、を備える空気入りタイヤにおいて、
前記傾斜スチールベルト層のコードが、スチールフィラメントの複数本を引き揃えた束を単位としてベルト幅方向に並置され、かつ、前記周方向ベルト層のコードが、複数本のフィラメントを撚り合わせてベルト幅方向に並置されてなることを特徴とする空気入りタイヤ。 - 前記周方向ベルト層のコードを構成するフィラメントの線径D1と、前記傾斜スチールベルト層のコードを構成するスチールフィラメントの線径D2とが下記式(1)、
D1<D2 (1)
で表わされる関係を満足する請求項1記載の空気入りタイヤ。 - 前記周方向ベルト層のコードが、5~15本のフィラメントからなる請求項1記載の空気入りタイヤ。
- 前記傾斜スチールベルト層のコード同士の間隔A1と、前記周方向ベルト層のコード同士の間隔A2とが下記式(2)、
A1>A2 (2)
で表わされる関係を満足する請求項1記載の空気入りタイヤ。 - 前記傾斜スチールベルト層の傾斜角度が、周方向に対して40~60°である請求項1記載の空気入りタイヤ。
- 前記周方向ベルト層のベルト幅方向の幅B1と、前記傾斜スチールベルト層のベルト幅方向の幅B2とが下記式(3)、
0.8×B2<B1<0.95×B2 (3)
で表わされる関係を満足する請求項1記載の空気入りタイヤ。 - 前記傾斜スチールベルト層のコードが、3~6本のスチールフィラメントからなる請求項1記載の空気入りタイヤ。
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EP11742374.9A EP2537686B1 (en) | 2010-02-15 | 2011-02-15 | Pneumatic tire |
CN201180009593.2A CN102762390B (zh) | 2010-02-15 | 2011-02-15 | 充气轮胎 |
US13/578,881 US20120305158A1 (en) | 2010-02-15 | 2011-02-15 | Pneumatic tire |
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EP (1) | EP2537686B1 (ja) |
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Cited By (1)
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FR2977829A1 (fr) * | 2011-07-12 | 2013-01-18 | Michelin Soc Tech | Pneumatique pour vehicule leger. |
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DE102012105846A1 (de) * | 2012-07-02 | 2014-01-02 | Continental Reifen Deutschland Gmbh | Fahrzeugluftreifen |
FR3035025B1 (fr) * | 2015-04-17 | 2017-03-31 | Michelin & Cie | Armature de renforcement de pneumatique |
FR3035026B1 (fr) * | 2015-04-17 | 2017-03-31 | Michelin & Cie | Armature de renforcement de pneumatique |
FR3042738B1 (fr) | 2015-10-27 | 2017-11-24 | Michelin & Cie | Pneumatique a couches de travail comprenant des monofilaments et a bande de roulement rainuree |
FR3042739B1 (fr) | 2015-10-27 | 2017-11-24 | Michelin & Cie | Pneumatique a couches de travail comprenant des monofilaments et a bande de roulement rainuree |
FR3042740B1 (fr) | 2015-10-27 | 2017-11-24 | Michelin & Cie | Pneumatique a couches de travail comprenant des monofilaments et a bande de roulement rainuree |
FR3042737B1 (fr) | 2015-10-27 | 2017-11-24 | Michelin & Cie | Pneumatique a couches de travail comprenant des monofilaments et a bande de roulement incisee |
FR3054805B1 (fr) | 2016-08-03 | 2018-07-27 | Michelin & Cie | Pneumatique a couches de travail comprenant des monofilaments et a bande de roulement rainuree |
JP6683570B2 (ja) * | 2016-08-05 | 2020-04-22 | 株式会社ブリヂストン | 空気入りタイヤ |
JP6717702B2 (ja) * | 2016-08-05 | 2020-07-01 | 株式会社ブリヂストン | 空気入りタイヤ |
FR3066144A1 (fr) | 2017-05-11 | 2018-11-16 | Compagnie Generale Des Etablissements Michelin | Pneumatique a sommet et bande de roulement optimises |
FR3066145A1 (fr) | 2017-05-11 | 2018-11-16 | Compagnie Generale Des Etablissements Michelin | Pneumatique a architecture et bande de roulement optimisees |
WO2020080441A1 (ja) * | 2018-10-17 | 2020-04-23 | 株式会社ブリヂストン | エラストマー-金属コード複合体およびこれを用いたタイヤ |
JP7305991B2 (ja) * | 2019-03-13 | 2023-07-11 | 横浜ゴム株式会社 | 空気入りタイヤ |
KR102187804B1 (ko) * | 2019-04-15 | 2020-12-09 | 한국타이어앤테크놀로지 주식회사 | 블록형 보강 구성을 구비하는 비공기입 타이어 |
CN110667315A (zh) * | 2019-10-10 | 2020-01-10 | 江苏通用科技股份有限公司 | 一种曲线高伸张带束层结构 |
JP2022084351A (ja) * | 2020-11-26 | 2022-06-07 | 栃木住友電工株式会社 | ベルト、タイヤ |
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EP2537686A4 (en) | 2015-04-22 |
US20120305158A1 (en) | 2012-12-06 |
CN102762390B (zh) | 2016-08-10 |
EP2537686B1 (en) | 2017-03-29 |
EP2537686A1 (en) | 2012-12-26 |
JP2011162166A (ja) | 2011-08-25 |
CN102762390A (zh) | 2012-10-31 |
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