WO2022145122A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
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- WO2022145122A1 WO2022145122A1 PCT/JP2021/039505 JP2021039505W WO2022145122A1 WO 2022145122 A1 WO2022145122 A1 WO 2022145122A1 JP 2021039505 W JP2021039505 W JP 2021039505W WO 2022145122 A1 WO2022145122 A1 WO 2022145122A1
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- Prior art keywords
- tire
- less
- mass
- belt layer
- equation
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- RJGHQTVXGKYATR-UHFFFAOYSA-L dibutyl(dichloro)stannane Chemical compound CCCC[Sn](Cl)(Cl)CCCC RJGHQTVXGKYATR-UHFFFAOYSA-L 0.000 description 1
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- NVVRVXMUPKBCEO-UHFFFAOYSA-N dimethoxy-methyl-(3-trimethylsilylsulfanylpropyl)silane Chemical compound CO[Si](C)(OC)CCCS[Si](C)(C)C NVVRVXMUPKBCEO-UHFFFAOYSA-N 0.000 description 1
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- OYWALDPIZVWXIM-UHFFFAOYSA-N dimethyl-[3-(oxiran-2-ylmethoxy)propyl]-trimethylsilyloxysilane Chemical compound C[Si](C)(C)O[Si](C)(C)CCCOCC1CO1 OYWALDPIZVWXIM-UHFFFAOYSA-N 0.000 description 1
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 1
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- ACXIAEKDVUJRSK-UHFFFAOYSA-N methyl(silyloxy)silane Chemical compound C[SiH2]O[SiH3] ACXIAEKDVUJRSK-UHFFFAOYSA-N 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
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- JAYXSROKFZAHRQ-UHFFFAOYSA-N n,n-bis(oxiran-2-ylmethyl)aniline Chemical compound C1OC1CN(C=1C=CC=CC=1)CC1CO1 JAYXSROKFZAHRQ-UHFFFAOYSA-N 0.000 description 1
- BSDJDVJJSQFGOW-UHFFFAOYSA-N n,n-diethyl-2-triethoxysilylethanamine Chemical compound CCO[Si](OCC)(OCC)CCN(CC)CC BSDJDVJJSQFGOW-UHFFFAOYSA-N 0.000 description 1
- BVBBZEKOMUDXMZ-UHFFFAOYSA-N n,n-diethyl-3-triethoxysilylpropan-1-amine Chemical compound CCO[Si](OCC)(OCC)CCCN(CC)CC BVBBZEKOMUDXMZ-UHFFFAOYSA-N 0.000 description 1
- ZLDHYRXZZNDOKU-UHFFFAOYSA-N n,n-diethyl-3-trimethoxysilylpropan-1-amine Chemical compound CCN(CC)CCC[Si](OC)(OC)OC ZLDHYRXZZNDOKU-UHFFFAOYSA-N 0.000 description 1
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- RKOBOSOXEJGFTF-UHFFFAOYSA-N n,n-dimethyl-2-trimethoxysilylethanamine Chemical compound CO[Si](OC)(OC)CCN(C)C RKOBOSOXEJGFTF-UHFFFAOYSA-N 0.000 description 1
- AQIQPUUNTCVHBS-UHFFFAOYSA-N n,n-dimethyl-3-triethoxysilylpropan-1-amine Chemical compound CCO[Si](OCC)(OCC)CCCN(C)C AQIQPUUNTCVHBS-UHFFFAOYSA-N 0.000 description 1
- QIOYHIUHPGORLS-UHFFFAOYSA-N n,n-dimethyl-3-trimethoxysilylpropan-1-amine Chemical compound CO[Si](OC)(OC)CCCN(C)C QIOYHIUHPGORLS-UHFFFAOYSA-N 0.000 description 1
- GEMHFKXPOCTAIP-UHFFFAOYSA-N n,n-dimethyl-n'-phenylcarbamimidoyl chloride Chemical compound CN(C)C(Cl)=NC1=CC=CC=C1 GEMHFKXPOCTAIP-UHFFFAOYSA-N 0.000 description 1
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- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
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- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- XACWJIQLDLUFSR-UHFFFAOYSA-N pyrrolidine-1-carbonyl chloride Chemical compound ClC(=O)N1CCCC1 XACWJIQLDLUFSR-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 125000004469 siloxy group Chemical group [SiH3]O* 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
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- QAZLUNIWYYOJPC-UHFFFAOYSA-M sulfenamide Chemical compound [Cl-].COC1=C(C)C=[N+]2C3=NC4=CC=C(OC)C=C4N3SCC2=C1C QAZLUNIWYYOJPC-UHFFFAOYSA-M 0.000 description 1
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- 230000001629 suppression Effects 0.000 description 1
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- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- WBVCLUDHJDTUAU-UHFFFAOYSA-N tetrabenzylstannane Chemical compound C=1C=CC=CC=1C[Sn](CC=1C=CC=CC=1)(CC=1C=CC=CC=1)CC1=CC=CC=C1 WBVCLUDHJDTUAU-UHFFFAOYSA-N 0.000 description 1
- XJPKDRJZNZMJQM-UHFFFAOYSA-N tetrakis(prop-2-enyl)stannane Chemical compound C=CC[Sn](CC=C)(CC=C)CC=C XJPKDRJZNZMJQM-UHFFFAOYSA-N 0.000 description 1
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- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 1
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- 238000012546 transfer Methods 0.000 description 1
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- FPBXRRDHCADTAL-UHFFFAOYSA-N triethoxy(3-nitropropyl)silane Chemical compound CCO[Si](OCC)(OCC)CCC[N+]([O-])=O FPBXRRDHCADTAL-UHFFFAOYSA-N 0.000 description 1
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- FJXRKYLOOJTENP-UHFFFAOYSA-N triethoxy-[2-(2-triethoxysilylethyldisulfanyl)ethyl]silane Chemical compound CCO[Si](OCC)(OCC)CCSSCC[Si](OCC)(OCC)OCC FJXRKYLOOJTENP-UHFFFAOYSA-N 0.000 description 1
- ASAOXGWSIOQTDI-UHFFFAOYSA-N triethoxy-[2-(2-triethoxysilylethyltetrasulfanyl)ethyl]silane Chemical compound CCO[Si](OCC)(OCC)CCSSSSCC[Si](OCC)(OCC)OCC ASAOXGWSIOQTDI-UHFFFAOYSA-N 0.000 description 1
- URIYERBJSDIUTC-UHFFFAOYSA-N triethoxy-[2-(2-triethoxysilylethyltrisulfanyl)ethyl]silane Chemical compound CCO[Si](OCC)(OCC)CCSSSCC[Si](OCC)(OCC)OCC URIYERBJSDIUTC-UHFFFAOYSA-N 0.000 description 1
- FBBATURSCRIBHN-UHFFFAOYSA-N triethoxy-[3-(3-triethoxysilylpropyldisulfanyl)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCSSCCC[Si](OCC)(OCC)OCC FBBATURSCRIBHN-UHFFFAOYSA-N 0.000 description 1
- VTHOKNTVYKTUPI-UHFFFAOYSA-N triethoxy-[3-(3-triethoxysilylpropyltetrasulfanyl)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCSSSSCCC[Si](OCC)(OCC)OCC VTHOKNTVYKTUPI-UHFFFAOYSA-N 0.000 description 1
- JXUKBNICSRJFAP-UHFFFAOYSA-N triethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCOCC1CO1 JXUKBNICSRJFAP-UHFFFAOYSA-N 0.000 description 1
- PTRSAJDNBVXVMV-UHFFFAOYSA-N triethoxy-[4-(4-triethoxysilylbutyldisulfanyl)butyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCCSSCCCC[Si](OCC)(OCC)OCC PTRSAJDNBVXVMV-UHFFFAOYSA-N 0.000 description 1
- NOPBHRUFGGDSAD-UHFFFAOYSA-N triethoxy-[4-(4-triethoxysilylbutyltetrasulfanyl)butyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCCSSSSCCCC[Si](OCC)(OCC)OCC NOPBHRUFGGDSAD-UHFFFAOYSA-N 0.000 description 1
- QPPXVBLDIDEHBA-UHFFFAOYSA-N trimethoxy(3-nitropropyl)silane Chemical compound CO[Si](OC)(OC)CCC[N+]([O-])=O QPPXVBLDIDEHBA-UHFFFAOYSA-N 0.000 description 1
- PMXKHNVLACXGAZ-UHFFFAOYSA-N trimethoxy(3-trimethylsilylsulfanylpropyl)silane Chemical compound CO[Si](OC)(OC)CCCS[Si](C)(C)C PMXKHNVLACXGAZ-UHFFFAOYSA-N 0.000 description 1
- JSXKIRYGYMKWSK-UHFFFAOYSA-N trimethoxy-[2-(2-trimethoxysilylethyltetrasulfanyl)ethyl]silane Chemical compound CO[Si](OC)(OC)CCSSSSCC[Si](OC)(OC)OC JSXKIRYGYMKWSK-UHFFFAOYSA-N 0.000 description 1
- NQRACKNXKKOCJY-UHFFFAOYSA-N trimethoxy-[3-(3-trimethoxysilylpropyldisulfanyl)propyl]silane Chemical compound CO[Si](OC)(OC)CCCSSCCC[Si](OC)(OC)OC NQRACKNXKKOCJY-UHFFFAOYSA-N 0.000 description 1
- JTTSZDBCLAKKAY-UHFFFAOYSA-N trimethoxy-[3-(3-trimethoxysilylpropyltetrasulfanyl)propyl]silane Chemical compound CO[Si](OC)(OC)CCCSSSSCCC[Si](OC)(OC)OC JTTSZDBCLAKKAY-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- BNBXBRPOAJZBNB-UHFFFAOYSA-N trimethoxy-[4-(4-trimethoxysilylbutyldisulfanyl)butyl]silane Chemical compound CO[Si](OC)(OC)CCCCSSCCCC[Si](OC)(OC)OC BNBXBRPOAJZBNB-UHFFFAOYSA-N 0.000 description 1
- GSZUEPNJCPXEGU-UHFFFAOYSA-N trimethoxy-[4-(4-trimethoxysilylbutyltrisulfanyl)butyl]silane Chemical compound CO[Si](OC)(OC)CCCCSSSCCCC[Si](OC)(OC)OC GSZUEPNJCPXEGU-UHFFFAOYSA-N 0.000 description 1
- LQBHRPIAMBRGHZ-UHFFFAOYSA-N trimethyl(3-tripropoxysilylpropylsulfanyl)silane Chemical compound CCCO[Si](OCCC)(OCCC)CCCS[Si](C)(C)C LQBHRPIAMBRGHZ-UHFFFAOYSA-N 0.000 description 1
- OCOGNADUEMUKHC-UHFFFAOYSA-N trimethyl-[3-[methyl(dipropoxy)silyl]propylsulfanyl]silane Chemical compound CCCO[Si](C)(OCCC)CCCS[Si](C)(C)C OCOGNADUEMUKHC-UHFFFAOYSA-N 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
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- 239000001993 wax Substances 0.000 description 1
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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
- B60C3/00—Tyres characterised by the transverse section
- B60C3/04—Tyres characterised by the transverse section characterised by the relative dimensions of the section, e.g. low profile
-
- 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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0327—Tread patterns characterised by special properties of the tread pattern
- B60C11/033—Tread patterns characterised by special properties of the tread pattern by the void or net-to-gross ratios of the patterns
-
- 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
- B60C9/0007—Reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal
-
- 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
- B60C9/1821—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers comprising discrete fibres or filaments
-
- 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
-
- 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
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C2001/0066—Compositions of the belt layers
-
- 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
- B60C2009/2061—Physical properties or dimensions of the belt coating rubber
-
- 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
-
- 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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential grooves
-
- 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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential grooves
- B60C2011/0353—Circumferential grooves characterised by width
-
- 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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Definitions
- This disclosure relates to pneumatic tires, more specifically to pneumatic tires with a belt layer.
- the fuel efficiency of a tire can be evaluated by rolling resistance, and it is known that the smaller the rolling resistance, the better the fuel efficiency of the tire.
- Patent Documents 1 to 4 it has been proposed to reduce the rolling resistance by devising the composition of the rubber composition constituting the tread portion of the tire.
- Japanese Unexamined Patent Publication No. 2018-178034 Japanese Unexamined Patent Publication No. 2019-089911 WO2018 / 186367 Gazette Japanese Unexamined Patent Publication No. 2019-206643
- This disclosure is Pneumatic tire with tread and belt layer
- a monofilament cord is used as a reinforcing cord for the belt layer.
- the number of arrangements e (lines / 5 cm) of the monofilament cords per 5 cm in the tire width direction in the tire radial cross section of the belt layer, and the tire cross section width Wt (mm) when incorporated into the regular rim and the internal pressure is 250 kPa.
- Equation 1 e / (0.31Wt + 56.45) ⁇ 1 ...
- Equation 2 Equation 2
- the tire according to the present disclosure is a pneumatic tire provided with a tread portion and a belt layer, and the belt layer uses a monofilament cord as a reinforcing cord. Then, in the tire radial cross section of the belt layer, the number of arrangements of monofilament cords per 5 cm in the tire width direction (hereinafter, also referred to as “ends”) e (lines / 5 cm) and the number of monofilament cords incorporated into the regular rim were set to 250 kPa.
- the tire cross-sectional width Wt is the linear distance between the sidewalls including all the patterns and letters on the side surface of the tire in the state where the tire is assembled to the regular rim and the internal pressure is 250 kPa to make no load. It is the width excluding the pattern and letters on the side of the tire from (total width of the tire).
- the above-mentioned "regular rim” is a rim defined for each tire in the standard system including the standard on which the tire is based.
- JATTA the standard on which the tire is based.
- Standard rims for applicable sizes "Measuring Rim” described in “STANDARDS MANUAL” for ETRTO (The European Tire and Rim Technical Organization), TRA (The Tire and Rim) for TRA (The Tire And Rim Ass) Refers to "DesignRim” described in "BOOK”.
- the rim that can be assembled and can maintain internal pressure that is, the rim that does not cause air leakage from between the rim and the tire, has the smallest rim diameter, and then the rim. Refers to the one with the narrowest width.
- the number of monofilament cords arranged (ends) per 5 cm in the tire width direction is the number of monofilament cords measured in the range of ⁇ 2.5 to 5.0 cm for the equatorial plane of the tire cross section per 5 cm. It can be converted and shown.
- Mechanism of effect manifestation in tires according to the present disclosure The mechanism of effect manifestation in tires according to the present disclosure, that is, a mechanism that sufficiently achieves both low rolling resistance and noise performance at high speeds, is as follows. Guessed.
- the monofilament cord has no twist, it is considered difficult to absorb the vibration in the monofilament cord, and when the monofilament cord is closely arranged in a tire with a narrow tread width, resonance between adjacent monofilament cords also occurs. Since it is likely to occur and the distance between the monofilament cords is shortened, resonance at high frequencies is also likely to occur, so that there is a concern that noise performance may be deteriorated especially at high speeds.
- the specific e / (0.31 Wt + 14.35) is preferably 1.01 or more, more preferably 1.04 or more, still more preferably 1.05 or more.
- 1.07 or more is further preferable, 1.09 or more is further preferable, 1.12 or more is further preferable, 1.19 or more is further preferable, and 1.21 or more is further preferable.
- 1.23 or more is further preferable, 1.24 or more is further preferable, 1.30 or more is further preferable, 1.41 or more is further preferable, and 1.42 or more is further preferable. ..
- the specific e / (0.31 Wt + 56.45) is preferably 0.95 or less, more preferably 0.94 or less, further preferably 0.80 or less, and 0.79.
- the following is more preferable, 0.75 or less is further preferable, 0.69 or less is further preferable, 0.68 or less is further preferable, 0.67 or less is further preferable, and 0.66.
- the following is more preferable, 0.65 or less is further preferable, 0.64 or less is further preferable, and 0.63 or less is further preferable.
- the specific e / (0.1924 Wt + 37.88) is preferably 1.01 or more, more preferably 1.02 or more, still more preferably 1.03 or more. It is more preferably 1.05 or more, further preferably 1.16 or more, and further preferably 1.22 or more. Further, the specific e / (0.1335Wt + 49.644)> 1 is preferably 1.01 or more, more preferably 1.03 or more, still more preferably 1.15 or more, and 1 It is more preferably .19 or more.
- the lower limit of the tire cross-sectional width Wt is not particularly limited, but considering that it is an automobile tire, it is preferably 125 mm or more, and more preferably 175 mm or more.
- the upper limit is not particularly limited, but is preferably 300 mm or less, and more preferably 250 mm or less.
- the number e (lines / 5 cm) of the monofilament cords arranged per 5 cm in the tire width direction is also not particularly limited, but is preferably 80 lines / 5 cm or more, more preferably 82 lines / 5 cm or more, and 85 lines. It is more preferably / 5 cm or more, and further preferably 95/5 cm or more. On the other hand, it is preferably less than 150 lines / 5 cm, and more preferably 120 lines / 5 cm or less.
- the cord outer diameter d (mm) of the monofilament cord is not particularly limited, but is preferably 0.1 mm or more, and more preferably 0.2 mm or more. On the other hand, it is preferably 0.5 mm or less, and more preferably 0.4 mm or less.
- the "cord outer diameter” in the above description refers to the outer diameter of the cord in the direction parallel to the tire width direction of the monofilament cord of the belt layer in the cross section of the tire, and the above-mentioned end e (book / 5 cm) is calculated. It is possible to use the average value of the outer diameter of the cord in the direction parallel to the tire width direction of the cord measured at that time.
- the present disclosure has focused on the loss tangent tan ⁇ of the rubber composition coated on the reinforcing cord as a parameter for suppressing the occurrence of such resonance between the monofilament cords. That is, the loss tangent tan ⁇ is a parameter indicating the energy absorption performance, and it is considered that the larger the value, the more energy can be absorbed. Therefore, the distance between the monofilament cords is shortened and resonance occurs at a high frequency. Even so, it is considered that the rubber composition absorbs the vibration energy, so that the deterioration of the noise performance at the time of high-speed running can be suppressed.
- the tan ⁇ of the rubber composition can be measured using, for example, a viscoelasticity measuring device such as “Iplexer (registered trademark)” manufactured by GABO.
- the average distance L (mm) between two adjacent monofilament cords can be obtained from the following equation based on the cord outer diameter d (mm) and the end e (book / 5 cm) of the monofilament cord.
- L ⁇ 50- (d ⁇ e) ⁇ / (e-1)
- the specific L ⁇ tan ⁇ is preferably 0.018 or more, more preferably 0.020 or more, further preferably 0.022 or more, and 0.026 or more. It is more preferably 0.027 or more, further preferably 0.028 or more, and even more preferably 0.029 or more.
- the angle between the reinforcing cord (monofilament cord) of the belt layer and the straight line parallel to the tire circumferential direction is preferably 10 ° or more, more preferably 15 ° or more. It is more preferably 20 ° or more, and even more preferably 23 ° or more. On the other hand, it is preferably 35 ° or less, more preferably 33 ° or less, and even more preferably 30 ° or less.
- the distance D (mm) is preferably 0.5 mm or less, more preferably 0.45 mm or less, and further preferably 0.22 mm or less.
- the belt layers can cooperate with each other to restrain the tread portion and suppress the amount of deformation of the tread portion, so that the tread portion can be deformed at high speed. It is possible to achieve both low rolling resistance and noise performance.
- the "average distance D between the belt layers” is the average distance between the monofilament cords of the belt layers, and is the inner surface of the monofilament cords of the belt layer on the surface side of the two overlapping belt layers on the equatorial plane. And the outer surface of the monofilament cord of the inner belt layer.
- At least one belt layer may satisfy the above-mentioned relationship for the above-mentioned "L ⁇ tan ⁇ ".
- belt Reinforcement Layer In the present disclosure, if a belt reinforcement layer is provided on the radial side of the tire from the belt layer, deformation of the tread portion is further suppressed, and both low rolling resistance and noise performance at high speeds are achieved. Can be more sufficiently planned, which is preferable. At this time, the average distance between the monofilament cord in the belt layer and the cord in the belt reinforcing layer is preferably 0.1 mm or more and 0.5 mm or less.
- the tire according to the present disclosure has a circumferential groove in the tread portion that extends continuously in the tire circumferential direction, and the circumferential groove with respect to the groove width L 0 of the circumferential groove on the ground contact surface of the tread portion.
- the ratio of the groove width L 80 (L 80 / L 0 ) at a depth of 80% of the maximum depth is preferably 0.3 or more and 0.7 or less.
- L 80 / L 0 is more preferably 0.35 or more, and further preferably 0.40 or more. It is more preferably 0.65 or less, and further preferably 0.60 or less.
- L 0 and L 80 are the linear distance (L 0 ) of the groove end portion of the tread circumferential groove of the tire in which the internal pressure is 250 kPa and the tire is in a no-load state, and the groove. It refers to the minimum distance (L 80 ) of the groove wall at a depth of 80%.
- the rim width is between the bead parts of the section where the tire is cut out in the radial direction with a width of 2 to 4 cm. It can be obtained by pressing them together.
- the tread portion has a plurality of circumferential grooves and the total cross-sectional area of the plurality of circumferential grooves is 10% or more and 30% or less of the cross-sectional area of the tread portion.
- the total cross-sectional area of the plurality of circumferential grooves is 10% or more and 30% or less of the cross-sectional area of the tread portion.
- It is more preferably 15% or more, and further preferably 18% or more.
- it is more preferably 27% or less, and further preferably 25% or less.
- the cross-sectional area of the above-mentioned circumferential groove is the area composed of a straight line connecting the ends of the tread circumferential groove and a groove wall in a tire mounted on a regular rim and having an internal pressure of 250 kPa and in a no-load state. It refers to the total value of, and can be simply obtained by pressing the bead portion of the section cut out in the radial direction of the tire with a width of 2 to 4 cm according to the rim width.
- the cross-sectional area of the tread portion is formed by the straight line connecting the circumferential groove ends of the tread portion and the tread surface in the radial cross section of the tire mounted on the regular rim and having an internal pressure of 250 kPa and in a no-load state.
- the belt reinforcing layer using organic fibers and / or steel cords is provided on the outer side in the radial direction of the tire from the belt layer, it refers to the area on the outer side in the radial direction from the belt reinforcing layer.
- the tread portion has a plurality of lateral grooves extending in the tire axial direction, and the total volume of the plurality of lateral grooves is 2.0% or more and 5.0% or less of the volume of the tread portion. Is preferable. As a result, it is possible to suppress the movement of the tread portion and achieve both low rolling resistance and noise performance at high speeds. It is more preferably 2.2% or more, further preferably 2.5% or more, and particularly preferably 2.7% or more. On the other hand, it is more preferably 4.0% or less, further preferably 3.5% or less, and particularly preferably 3.0% or less.
- the above-mentioned volume of the lateral groove refers to the total volume of the volume composed of the surface connecting the ends of the lateral groove and the groove wall in a tire mounted on a regular rim and having an internal pressure of 250 kPa and in a no-load state.
- the volume of each lateral groove can be calculated and calculated from the total value.
- the volume of the tread portion can be calculated by calculating the area of the tread portion from the section and multiplying it by the outer diameter, and obtaining the difference from the volume of the lateral groove.
- the rubber composition coated with the monofilament cord can be obtained from the rubber component described below and other blending materials. can.
- the rubber component is not particularly limited, and isoprene-based rubber, butadiene rubber (BR), styrene-butadiene rubber (SBR), diene-based rubber such as nitrile rubber (NBR), butyl rubber, and the like.
- Rubber (polymer) generally used in the manufacture of tires, such as butyl rubber, can be used.
- isoprene-based rubber is preferable, and NR is preferable because the cis structure of polyisoprene is close to 100% and the tensile strength is superior to other rubber components.
- BR and SBR may be used together.
- the content (total content) of isoprene-based rubber in 100 parts by mass of the rubber component is preferably 60 parts by mass or more, more preferably 80 parts by mass or more, and 90 parts by mass or more. Is more preferable.
- isoprene-based rubber examples include natural rubber (NR), isoprene rubber (IR), modified NR, modified NR, modified IR, etc., but NR is preferable from the viewpoint of excellent strength.
- NR for example, SIR20, RSS # 3, TSR20, etc., which are common in the tire industry, can be used.
- the IR is not particularly limited, and for example, an IR 2200 or the like, which is common in the tire industry, can be used.
- Modified NR includes deproteinized natural rubber (DPNR), high-purity natural rubber (UPNR), etc.
- modified NR includes epoxidized natural rubber (ENR), hydrogenated natural rubber (HNR), grafted natural rubber, etc.
- Examples of the modified IR include epoxidized isoprene rubber, hydrogenated isoprene rubber, grafted isoprene rubber and the like. These may be used alone or in combination of two or more.
- (B) BR In the present embodiment, as the rubber component, BR of 5 parts by mass or more and 25 parts by mass or less may be used together with NR, if necessary.
- the weight average molecular weight of BR is, for example, more than 100,000 and less than 2 million.
- the vinyl bond amount (1,2-bonded butadiene unit amount) of BR is, for example, more than 1% by mass and less than 30% by mass.
- the cis content of BR is, for example, more than 1% by mass and 98% by mass or less.
- the trans content of BR is, for example, more than 1% by weight and less than 60% by weight.
- the cis content can be measured by infrared absorption spectrum analysis.
- the BR is not particularly limited, and BR having a high cis content (cis content of 90% or more), BR having a low cis content, BR containing syndiotactic polybutadiene crystals, and the like can be used.
- the BR may be either a non-modified BR or a modified BR, and as the modified BR, for example, an S-modified BR modified with a compound (modifying agent) represented by the following formula can be used.
- R 1 , R 2 and R 3 are the same or different, and contain an alkyl group, an alkoxy group, a silyloxy group, an acetal group, a carboxyl group (-COOH), a mercapto group (-SH) or a derivative thereof.
- R 4 and R 5 represent the same or different hydrogen atoms or alkyl groups. R 4 and R 5 may be combined to form a ring structure with nitrogen atoms.
- n represents an integer.
- modified BR modified by the compound (modifying agent) represented by the above formula examples include BR having the polymerization terminal (active terminal) modified by the compound represented by the above formula.
- Alkoxy groups are suitable for R 1 , R 2 and R 3 (preferably an alkoxy group having 1 to 8 carbon atoms, and more preferably an alkoxy group having 1 to 4 carbon atoms).
- Alkyl groups (preferably alkyl groups having 1 to 3 carbon atoms) are suitable as R 4 and R 5 .
- n is preferably 1 to 5, more preferably 2 to 4, and even more preferably 3.
- R 4 and R 5 are bonded to form a ring structure together with a nitrogen atom, a 4- to 8-membered ring is preferable.
- the alkoxy group also includes a cycloalkoxy group (cyclohexyloxy group, etc.) and an aryloxy group (phenoxy group, benzyloxy group, etc.).
- the above modifier include 2-dimethylaminoethyltrimethoxysilane, 3-dimethylaminopropyltrimethoxysilane, 2-dimethylaminoethyltriethoxysilane, 3-dimethylaminopropyltriethoxysilane, and 2-diethylaminoethyltri.
- Examples thereof include methoxysilane, 3-diethylaminopropyltrimethoxysilane, 2-diethylaminoethyltriethoxysilane, and 3-diethylaminopropyltriethoxysilane. These may be used alone or in combination of two or more.
- modified BR a modified BR modified with the following compound (modifying agent) can also be used.
- the modifier include polyglycidyl ethers of polyhydric alcohols such as ethylene glycol diglycidyl ether, glycerin triglycidyl ether, trimethylolethanetriglycidyl ether, and trimethylolpropane triglycidyl ether; and two or more diglycidylated bisphenol A.
- Tetraglycidylaminodiphenylmethane tetraglycidyl-p-phenylenediamine, diglycidylaminomethylcyclohexane, tetraglycidyl-1,3-bisaminomethylcyclohexane and other diglycidylamino compounds; bis- (1-methylpropyl) carbamate chloride, Amino group-containing acid chlorides such as 4-morpholincarbonyl chloride, 1-pyrrolidincarbonyl chloride, N, N-dimethylcarbamide acid chloride, N, N-diethylcarbamide acid chloride; 1,3-bis- (glycidyloxypropyl) -tetra Epoxy group-containing silane compounds such as methyldisiloxane, (3-glycidyloxypropyl) -pentamethyldisiloxane; (trimethylsilyl) [3- (trimethoxysilyl) propyl] sulfide, (trimethyl
- silane compound Containing silane compound; N-substituted aziridine compound such as ethyleneimine and propyleneimine; methyltrietoki Sisilane, N, N-bis (trimethylsilyl) -3-aminopropyltrimethoxysilane, N, N-bis (trimethylsilyl) -3-aminopropyltriethoxysilane, N, N-bis (trimethylsilyl) aminoethyltrimethoxysilane, Alkoxysilanes such as N, N-bis (trimethylsilyl) aminoethyltriethoxysilane; 4-N, N-dimethylaminobenzophenone, 4-N, N-di-t-butylaminobenzophenone, 4-N, N-diphenylamino Benzophenone, 4,4'-bis (dimethylamino) benzophenone, 4,4'-bis (diethylamino) benzophenone, 4,4
- Benzaldehyde compounds having an amino group and / or a substituted amino group such as benzaldehyde; N-methyl-2-pyrrolidone, N-vinyl-2-pyrrolidone, N-phenyl-2-pyrrolidone, Nt-butyl-2-pyrrolidone, N-substituted pyrrolidone such as N-methyl-5-methyl-2-pyrrolidone; N-substituted piperidone such as N-methyl-2-piperidone, N-vinyl-2-piperidone, N-phenyl-2-piperidone; N- Methyl- ⁇ -caprolactam, N-phenyl- ⁇ -caprolactam, N-methyl- ⁇ -laurilolactum, N-vinyl- ⁇ -laurilolactum, N-methyl- ⁇ -propiolactam, N-phenyl- ⁇ - In addition to N-substituted lactams such as propiolactam,
- tin-modified BR can also be used.
- the tin-modified BR is obtained by polymerizing 1,3-butadiene with a lithium initiator and then adding a tin compound, and the terminal of the tin-modified BR molecule is further bonded by a tin-carbon bond. The one is preferable.
- lithium initiator examples include lithium-based compounds such as alkyllithium, aryllithium, vinyllithium, organic tin lithium, and organic nitrogen lithium compounds, and lithium metals.
- the lithium initiator as an initiator for tin-modified BR, a tin-modified BR having a high vinyl content and a low cis content can be produced.
- tin compounds include tin tetrachloride, butyltin trichloride, dibutyltin dichloride, dioctyltin dichloride, tributyltin chloride, triphenyltin chloride, diphenyldibutyltin, triphenyltinethoxydo, diphenyldimethyltin, ditrilltinchloride, and diphenyltindioctano.
- examples thereof include ate, divinyldiethyl tin, tetrabenzyltin, dibutyltin distearate, tetraallyl tin, p-tributyltin styrene and the like.
- the content of tin atoms in the tin-modified BR is preferably 50 ppm or more, more preferably 60 ppm or more. On the other hand, 3000 ppm or less is preferable, 2500 ppm or less is more preferable, and 250 ppm or less is further preferable.
- the molecular weight distribution (Mw / Mn) of the tin-modified BR is preferably 2 or less, more preferably 1.5 or less.
- the vinyl bond amount in the tin-modified BR is preferably 5% by mass or more, more preferably 7% by mass or more.
- the vinyl bond amount of the tin-modified BR is preferably 50% by mass or less, more preferably 20% by mass or less.
- S-modified BR and tin-modified BR may be used alone or in combination of two or more.
- BR for example, products such as Ube Kosan Co., Ltd., JSR Co., Ltd., Asahi Kasei Co., Ltd., and Nippon Zeon Co., Ltd. can be used.
- (C) SBR Further, in the present embodiment, as the rubber component, 5 to 25 parts by mass of SBR may be used together with NR, or may be used in combination with the above-mentioned BR, if necessary.
- the weight average molecular weight of SBR is, for example, more than 100,000 and less than 2 million.
- the styrene content of SBR is, for example, preferably more than 5% by mass, more preferably more than 10% by mass, still more preferably more than 20% by mass. On the other hand, less than 50% by mass is preferable, less than 40% by mass is more preferable, and less than 35% by mass is further preferable.
- the vinyl bond amount of SBR is preferably more than 5% by mass and less than 70% by mass, for example.
- the structure identification of SBR (measurement of styrene content and vinyl bond amount) can be performed using, for example, an apparatus of the JNM-ECA series manufactured by JEOL Ltd.
- the SBR is not particularly limited, and for example, emulsion-polymerized styrene-butadiene rubber (E-SBR), solution-polymerized styrene-butadiene rubber (S-SBR), and the like can be used.
- E-SBR emulsion-polymerized styrene-butadiene rubber
- S-SBR solution-polymerized styrene-butadiene rubber
- the SBR may be either a non-modified SBR or a modified SBR, and these may be used alone or in combination of two or more.
- the modified SBR may be any SBR having a functional group that interacts with a filler such as silica.
- at least one end of the SBR is modified with a compound having the above functional group (modifying agent).
- SBR terminal modified SBR having the above functional group at the terminal
- main chain modified SBR having the functional group in the main chain
- main chain terminal modified SBR having the functional group at the main chain and the terminal (for example, to the main chain).
- Main chain terminal modified SBR having the above functional group and having at least one end modified with the above modifying agent or a polyfunctional compound having two or more epoxy groups in the molecule, which is modified (coupled) and has a hydroxyl group.
- SBR for example, SBR manufactured and sold by Sumitomo Chemical Co., Ltd., JSR Corporation, Asahi Kasei Co., Ltd., Nippon Zeon Co., Ltd., etc. can be used.
- the SBR may be used alone or in combination of two or more.
- rubber (polymer) generally used in the production of tires such as nitrile rubber (NBR) may be contained, if necessary.
- NBR nitrile rubber
- the rubber composition preferably contains a filler.
- the filler include carbon black, silica, graphite, calcium carbonate, talc, alumina, clay, aluminum hydroxide, mica and the like, and among these, carbon black can be preferably used as a reinforcing agent. .. Further, if necessary, silica is preferably used as a reinforcing agent, but in this case, it is preferable to use it in combination with a silane coupling agent.
- Carbon black The rubber composition preferably contains carbon black.
- the content of carbon black is preferably, for example, 10 parts by mass or more and 100 parts by mass or less, more preferably 40 parts by mass or more and 70 parts by mass or less, and 50 parts by mass with respect to 100 parts by mass of the rubber component. It is more preferably more than parts and 60 parts by mass or less.
- the carbon black is not particularly limited, and furnace black (furness carbon black) such as SAF, ISAF, HAF, MAF, FEF, SRF, GPF, APF, FF, CF, SCF and ECF; acetylene black (acetylene carbon black).
- furnace black furness carbon black
- thermal black thermal carbon black
- FT and MT channel black
- EPC EPC
- MPC MPC and CC
- the nitrogen adsorption specific surface area (N 2 SA) of carbon black is, for example, more than 30 m 2 / g and less than 250 m 2 / g.
- the amount of dibutyl phthalate (DBP) absorbed by carbon black is, for example, more than 50 ml / 100 g and less than 250 ml / 100 g.
- the nitrogen adsorption specific surface area of carbon black is measured according to ASTM D4820-93, and the amount of DBP absorbed is measured according to ASTM D2414-93.
- Specific carbon black is not particularly limited, and examples thereof include N134, N110, N220, N234, N219, N339, N330, N326, N351, N550, and N762.
- Commercially available products include, for example, Asahi Carbon Co., Ltd., Cabot Japan Co., Ltd., Tokai Carbon Co., Ltd., Mitsubishi Chemical Corporation, Lion Corporation, Shin Nikka Carbon Co., Ltd., Columbia Carbon Co., Ltd., etc. Can be used. These may be used alone or in combination of two or more.
- the rubber composition preferably further contains silica, if necessary.
- the BET specific surface area of silica is preferably more than 140 m 2 / g, more preferably more than 160 m 2 / g, from the viewpoint of obtaining good durability performance. On the other hand, from the viewpoint of obtaining good low rolling resistance, it is preferably less than 250 m 2 / g, and more preferably less than 220 m 2 / g.
- the content of the silica with respect to 100 parts by mass of the rubber component is preferably 3 parts by mass or more, more preferably 5 parts by mass or more when not used in combination with a silane coupling agent.
- 25 parts by mass or less is preferable, and 15 parts by mass or less is more preferable.
- 25 parts by mass or more is preferable.
- 50 parts by mass or less is preferable, 40 parts by mass or less is more preferable, and 30 parts by mass or less is further preferable.
- the above-mentioned BET specific surface area is the value of N 2 SA measured by the BET method according to ASTM D3037-93.
- silica examples include dry method silica (anhydrous silica) and wet method silica (hydrous silica). Of these, wet silica is preferable because it has a large number of silanol groups.
- silica for example, products such as Degussa, Rhodia, Tosoh Silica Co., Ltd., Solvay Japan Co., Ltd., Tokuyama Corporation can be used.
- silane coupling agent is not particularly limited, and for example, bis (3-triethoxysilylpropyl) tetrasulfide, bis (2-triethoxysilylethyl) tetrasulfide, bis (4-triethoxysilylbutyl) tetrasulfide, and the like.
- silane coupling agent for example, products such as Degussa, Momentive, Shinetsu Silicone Co., Ltd., Tokyo Chemical Industry Co., Ltd., Azumax Co., Ltd., Toray Dow Corning Co., Ltd. can be used.
- the content of the silane coupling agent is, for example, more than 3 parts by mass and less than 15 parts by mass with respect to 100 parts by mass of silica.
- the rubber composition is commonly used in the tire industry, for example, graphite, calcium carbonate, talc, alumina, clay and aluminum hydroxide. , Mica and the like may be further contained. These contents are, for example, more than 0.1 part by mass and less than 200 parts by mass with respect to 100 parts by mass of the rubber component.
- the rubber composition preferably contains a curable resin component such as a modified resorcin resin or a modified phenol resin.
- a curable resin component such as a modified resorcin resin or a modified phenol resin.
- modified resorcin resin examples include Sumicanol 620 (modified resorcin resin) manufactured by Taoka Chemical Industry Co., Ltd., and examples of the modified phenol resin include PR12686 (cashew oil) manufactured by Sumitomo Bakelite Co., Ltd. Modified phenol resin) and the like.
- the content of the curable resin component is preferably 1 part by mass or more, and more preferably 2 parts by mass or more, with respect to 100 parts by mass of the rubber component, for example, from the viewpoint of obtaining a large reaction force at the time of deformation.
- 10 parts by mass or less is preferable, and 8 parts by mass or less is more preferable.
- the modified resorcin resin it is preferable to also contain a methylene donor as a curing agent.
- a methylene donor include hexamethylenetetramine (HMT), hexamethoxymethylol melamine (HMMM), hexamethylol melamine pentamethyl ether (HMMPME), and the like, and examples thereof include 100 parts by mass of the curable resin component. It is preferably contained in an amount of 5 parts by mass or more and about 15 parts by mass. If it is too small, a sufficient complex elastic modulus may not be obtained. On the other hand, if the amount is too large, the viscosity of the rubber may increase and the workability may deteriorate.
- HMT hexamethylenetetramine
- HMMM hexamethoxymethylol melamine
- HMMPME hexamethylol melamine pentamethyl ether
- methylene donor for example, Sumikanol 507 manufactured by Taoka Chemical Industry Co., Ltd. can be used.
- the rubber composition preferably contains a resin component, if necessary, from the viewpoint of processability (imparting adhesiveness).
- the resin component may be solid or liquid at room temperature, and specific resin components include, for example, rosin-based resin, styrene-based resin, kumaron-based resin, terpene-based resin, C5 resin, and C9 resin. , C5C9 resin, acrylic resin and other resins, and two or more of them may be used in combination.
- the content of the resin component is more than 2 parts by mass, preferably less than 45 parts by mass, and more preferably less than 30 parts by mass with respect to 100 parts by mass of the rubber component.
- the rosin-based resin is a resin containing rosin acid as a main component, which is obtained by processing pine fat.
- This rosin-based resin (rosins) can be classified according to the presence or absence of modification, and can be classified into non-modified rosin (unmodified rosin) and rosin-modified form (rosin derivative).
- Non-modified rosins include tall rosins (also known as tall oil rosins), gum rosins, wood rosins, asymmetric rosins, polymerized rosins, hydrogenated rosins, and other chemically modified rosins.
- the rosin-modified form is a modified form of unmodified rosin, and examples thereof include rosin esters, unsaturated carboxylic acid-modified rosins, unsaturated carboxylic acid-modified rosin esters, rosin amide compounds, and rosin amine salts.
- the styrene-based resin is a polymer using a styrene-based monomer as a constituent monomer, and examples thereof include a polymer obtained by polymerizing a styrene-based monomer as a main component (50% by mass or more).
- styrene-based monomers styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, ⁇ -methylstyrene, p-methoxystyrene, p-tert-butylstyrene, p-phenylstyrene, o-Chlorostyrene, m-chlorostyrene, p-chlorostyrene, etc.
- styrene-based monomers are individually polymerized, and in addition to copolymers obtained by copolymerizing two or more styrene-based monomers, styrene-based monomers And other monomer copolymers that can be copolymerized with this.
- Examples of the other monomers include acrylonitriles such as acrylonitrile and methacrylate, unsaturated carboxylic acids such as acrylics and methacrylic acid, unsaturated carboxylic acid esters such as methyl acrylate and methyl methacrylate, chloroprene and butadiene.
- Examples thereof include dienes such as isoprene, olefins such as 1-butene and 1-pentene; ⁇ , ⁇ -unsaturated carboxylic acids such as maleic anhydride or acid anhydrides thereof.
- the kumaron inden resin is a resin containing kumaron and inden as monomer components constituting the skeleton (main chain) of the resin.
- Examples of the monomer component contained in the skeleton other than kumaron and indene include styrene, ⁇ -methylstyrene, methylindene, vinyltoluene and the like.
- the content of the Kumaron indene resin is, for example, more than 1.0 part by mass and less than 50.0 parts by mass with respect to 100 parts by mass of the rubber component.
- the hydroxyl value (OH value) of the Kumaron indene resin is, for example, more than 15 mgKOH / g and less than 150 mgKOH / g.
- the OH value is the amount of potassium hydroxide required to neutralize the acetic acid bonded to the hydroxyl group when acetylating 1 g of the resin in milligrams, and is represented by the potential difference titration method (JIS K 0070: It is a value measured by 1992).
- the softening point of the Kumaron inden resin is, for example, more than 30 ° C and less than 160 ° C.
- the softening point is the temperature at which the ball drops when the softening point defined in JIS K 6220-1: 2001 is measured by a ring-ball type softening point measuring device.
- terpene-based resin examples include polyterpenes, terpene phenols, aromatic-modified terpene resins and the like.
- Polyterpene is a resin obtained by polymerizing a terpene compound and a hydrogenated additive thereof.
- the terpene compound is a hydrocarbon having a composition of ( C 5 H 8 ) n and an oxygen - containing derivative thereof .
- Etc. which are compounds having a terpene as a basic skeleton, for example, ⁇ -pinene, ⁇ -pinene, dipentene, limonene, milsen, aloocimen, osimene, ⁇ -ferandrene, ⁇ -terpinene, ⁇ -terpinene, terpinene. , 1,8-Cineol, 1,4-Cineol, ⁇ -terpineol, ⁇ -terpineol, ⁇ -terpineol and the like.
- polyterpene examples include terpene resins such as ⁇ -pinene resin, ⁇ -pinene resin, limonene resin, dipentene resin, and ⁇ -pinene / limonene resin made from the above-mentioned terpene compound, as well as hydrogen obtained by hydrogenating the terpene resin.
- Additive terpene resin can also be mentioned.
- the terpene phenol include a resin obtained by copolymerizing the above-mentioned terpene compound and the phenol-based compound, and a resin obtained by hydrogenating the resin. Specifically, the above-mentioned terpene compound, the phenol-based compound and the formalin are condensed. Resin is mentioned.
- Examples of the phenolic compound include phenol, bisphenol A, cresol, xylenol and the like.
- examples of the aromatic-modified terpene resin include a resin obtained by modifying a terpene resin with an aromatic compound, and a resin obtained by hydrogenating the resin.
- the aromatic compound is not particularly limited as long as it is a compound having an aromatic ring, and for example, phenol compounds such as phenol, alkylphenol, alkoxyphenol, and unsaturated hydrocarbon group-containing phenol; naphthol, alkylnaphthol, alkoxynaphthol, and the like.
- Naftor compounds such as unsaturated hydrocarbon group-containing naphthol; styrene derivatives such as styrene, alkylstyrene, alkoxystyrene, and unsaturated hydrocarbon group-containing styrene; kumaron, inden and the like can be mentioned.
- C5 resin refers to a resin obtained by polymerizing a C5 fraction.
- the C5 fraction include petroleum distillates having 4 to 5 carbon atoms such as cyclopentadiene, pentene, pentadiene, and isoprene.
- a dicyclopentadiene resin DCPD resin
- DCPD resin dicyclopentadiene resin
- the "C9 resin” refers to a resin obtained by polymerizing a C9 fraction, and may be hydrogenated or modified.
- the C9 fraction include petroleum fractions having 8 to 10 carbon atoms such as vinyltoluene, alkylstyrene, indene, and methyl indene.
- a kumaron indene resin, a kumaron resin, an indene resin, and an aromatic vinyl-based resin are preferably used.
- aromatic vinyl-based resin a homopolymer of ⁇ -methylstyrene or styrene or a copolymer of ⁇ -methylstyrene and styrene is preferable because it is economical, easy to process, and excellent in heat generation. , A polymer of ⁇ -methylstyrene and styrene is more preferred.
- aromatic vinyl-based resin for example, those commercially available from Clayton, Eastman Chemical, etc. can be used.
- C5C9 resin refers to a resin obtained by copolymerizing the C5 fraction and the C9 fraction, and may be hydrogenated or modified.
- Examples of the C5 fraction and the C9 fraction include the above-mentioned petroleum fraction.
- As the C5C9 resin for example, those commercially available from Tosoh Corporation, LUHUA, etc. can be used.
- the acrylic resin is not particularly limited, but for example, a solvent-free acrylic resin can be used.
- the solvent-free acrylic resin is a high-temperature continuous polymerization method (high-temperature continuous lump polymerization method) (US Pat. No. 4,414,370) without using polymerization initiators, chain transfer agents, organic solvents, etc. as auxiliary raw materials as much as possible.
- Examples thereof include a (meth) acrylic resin (polymer) synthesized by the method described in ⁇ 45 and the like).
- (meth) acrylic means methacrylic and acrylic.
- Examples of the monomer component constituting the acrylic resin include (meth) acrylic acid, (meth) acrylic acid ester (alkyl ester, aryl ester, aralkyl ester, etc.), (meth) acrylamide, and (meth) acrylamide derivative.
- (Meta) acrylic acid derivatives such as.
- acrylic resin styrene, ⁇ -methylstyrene, vinyltoluene, vinylnaphthalene, divinylbenzene, trivinylbenzene, divinylnaphthalene, etc., together with (meth) acrylic acid and (meth) acrylic acid derivative, etc.
- Aromatic vinyl may be used as the monomer component constituting the acrylic resin.
- the acrylic resin may be a resin composed of only a (meth) acrylic component or a resin having a component other than the (meth) acrylic component as a component. Further, the acrylic resin may have a hydroxyl group, a carboxyl group, a silanol group, or the like.
- the resin component examples include Maruzen Petrochemical Co., Ltd., Sumitomo Bakelite Co., Ltd., Yasuhara Chemical Co., Ltd., Toso Co., Ltd., Rutgers Chemicals Co., Ltd., BASF Co., Ltd., Arizona Chemical Co., Ltd., Nikko Chemical Co., Ltd., Co., Ltd. ) Products such as Nippon Catalyst, JX Energy Co., Ltd., Arakawa Chemical Industry Co., Ltd., Taoka Chemical Industry Co., Ltd. can be used.
- the rubber composition preferably contains cobalt organic acid. Since cobalt organic acid serves to crosslink the cord and the rubber, the adhesiveness between the cord and the rubber can be improved by blending this component.
- organic cobalt acid examples include cobalt stearate, cobalt naphthenate, cobalt neodecanoate, and boron tricobalt neodecanoate.
- the content of the cobalt organic acid is preferably 500 ppm or more, more preferably 700 ppm or more, and further preferably 900 ppm or more as the cobalt concentration in the rubber composition. On the other hand, it is preferably 1500 ppm or less, and more preferably 1300 ppm or less. If the amount is too small, the adhesiveness between the plating layer of the steel cord and the rubber may not be sufficiently ensured. On the other hand, if the amount is too large, the oxidative deterioration of the rubber becomes remarkable, and the breaking characteristics may be deteriorated.
- the rubber composition preferably contains a reversion (vulcanization return) inhibitor, if necessary. As a result, reversion is suppressed and durability is improved.
- the content of the anti-reversion agent is preferably 0.1 part by mass or more and 3 parts by mass or less, and more preferably 0.2 parts by mass or more and 2.5 parts by mass or less with respect to 100 parts by mass of the rubber component. , 0.3 parts by mass or more, more preferably 2 parts by mass or less.
- a specific anti-version agent for example, Parkalink 900 (1,3-bis (citraconimidemethyl) benzene) manufactured by Flexis can be used.
- the rubber composition preferably contains an anti-aging agent.
- the content of the anti-aging agent is, for example, more than 1 part by mass and less than 10 parts by mass with respect to 100 parts by mass of the rubber component.
- antiaging agent examples include naphthylamine-based antiaging agents such as phenyl- ⁇ -naphthylamine; diphenylamine-based antiaging agents such as octylated diphenylamine and 4,4'-bis ( ⁇ , ⁇ '-dimethylbenzyl) diphenylamine; N. -Isopropyl-N'-phenyl-p-phenylenediamine, N- (1,3-dimethylbutyl) -N'-phenyl-p-phenylenediamine, N, N'-di-2-naphthyl-p-phenylenediamine, etc.
- P-Phenylenediamine-based antioxidants P-Phenylenediamine-based antioxidants; quinoline-based antioxidants such as polymers of 2,2,4-trimethyl-1,2-dihydroquinolin; 2,6-di-t-butyl-4-methylphenol, Monophenolic antioxidants such as styrenated phenol; tetrakis- [methylene-3- (3', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] bis, tris, polyphenolic aging such as methane Examples include preventive agents. These may be used alone or in combination of two or more.
- anti-aging agent for example, products of Seiko Chemical Co., Ltd., Sumitomo Chemical Co., Ltd., Ouchi Shinko Chemical Industry Co., Ltd., Flexis Co., Ltd., etc. can be used.
- the rubber composition may contain stearic acid.
- the content of stearic acid is, for example, more than 0.5 parts by mass and less than 10.0 parts by mass with respect to 100 parts by mass of the rubber component.
- stearic acid conventionally known ones can be used, and for example, products such as NOF Corporation, NOF Corporation, Kao Corporation, Wako Pure Chemical Industries, Ltd., and Chiba Fatty Acid Co., Ltd. can be used.
- the rubber composition may contain zinc oxide.
- the content of zinc oxide is, for example, more than 0.5 parts by mass and less than 15 parts by mass with respect to 100 parts by mass of the rubber component.
- conventionally known products can be used, for example, products of Mitsui Metal Mining Co., Ltd., Toho Zinc Co., Ltd., Hakusui Tech Co., Ltd., Shodo Chemical Industry Co., Ltd., Sakai Chemical Industry Co., Ltd., etc. Can be used.
- the rubber composition preferably contains a crosslinking agent such as sulfur.
- the content of the cross-linking agent is, for example, more than 0.1 part by mass and less than 10.0 parts by mass with respect to 100 parts by mass of the rubber component.
- sulfur examples include powdered sulfur, precipitated sulfur, colloidal sulfur, insoluble sulfur, highly dispersible sulfur, and soluble sulfur, which are generally used in the rubber industry. These may be used alone or in combination of two or more.
- sulfur for example, products such as Tsurumi Chemical Industry Co., Ltd., Karuizawa Sulfur Co., Ltd., Shikoku Chemicals Corporation, Flexis Co., Ltd., Nippon Kanryo Kogyo Co., Ltd., Hosoi Chemical Industry Co., Ltd. can be used. ..
- cross-linking agent other than sulfur examples include Tackilol V200 manufactured by Taoka Chemical Industry Co., Ltd., Duralink HTS (1,6-hexamethylene-sodium dithiosulfate / dihydrate) manufactured by Flexis, and Rankses.
- examples thereof include a sulfurizing agent containing a sulfur atom such as KA9188 (1,6-bis (N, N'-dibenzylthiocarbamoyldithio) hexane) and an organic peroxide such as dicumyl peroxide.
- the rubber composition preferably contains a vulcanization accelerator.
- the content of the vulcanization accelerator is, for example, more than 0.3 parts by mass and less than 10.0 parts by mass with respect to 100 parts by mass of the rubber component.
- vulcanization accelerator examples include thiazole-based vulcanization accelerators such as 2-mercaptobenzothiazole, di-2-benzothiazolyl disulfide, and N-cyclohexyl-2-benzothiadylsulfenamide; tetramethylthiuram disulfide (TMTD).
- thiazole-based vulcanization accelerators such as 2-mercaptobenzothiazole, di-2-benzothiazolyl disulfide, and N-cyclohexyl-2-benzothiadylsulfenamide
- TMTD tetramethylthiuram disulfide
- TzTD Tetrabenzyltiuram disulfide
- TOT-N tetrakis (2-ethylhexyl) thiuram disulfide
- other thiuram-based vulcanization accelerators N-cyclohexyl-2-benzothiazolesulfenamide, Nt-butyl- 2-benzothiazolyl sulfenamide, N-oxyethylene-2-benzothiazolesulfenamide, N-oxyethylene-2-benzothiazolesulfenamide, N, N'-diisopropyl-2-benzothiazolesulfenamide, etc.
- Sulfenamide-based vulcanization accelerator Sulfenamide-based vulcanization accelerator
- guanidine-based vulcanization accelerators such as diphenylguanidine, dioltotrilguanidine, orthotrilviguanidine can be mentioned. These may be used alone or in combination of two or more.
- additives generally used in the tire industry such as fatty acid metal salts, carboxylic acid metal salts, and organic peroxides, may be further added to the rubber composition. good.
- the content of these additives is, for example, more than 0.1 part by mass and less than 200 parts by mass with respect to 100 parts by mass of the rubber component.
- the rubber composition is obtained by a general method, for example, a base kneading step of kneading a rubber component and a filler such as carbon black, and a cross-linking with the kneaded product obtained in the base kneading step. It is produced by a manufacturing method including a finishing kneading step of kneading with an agent.
- Kneading can be performed using a known (sealed) kneader such as a Banbury mixer, a kneader, or an open roll.
- a known (sealed) kneader such as a Banbury mixer, a kneader, or an open roll.
- the kneading temperature of the base kneading step is, for example, more than 50 ° C. and less than 200 ° C.
- the kneading time is, for example, more than 30 seconds and less than 30 minutes.
- compounding agents conventionally used in the rubber industry such as softeners such as oil, stearic acid, zinc oxide, antiaging agents, waxes, vulcanization accelerators, etc., are used as needed. May be added and kneaded as appropriate.
- the finish kneading step the kneaded product obtained in the base kneading step and the cross-linking agent are kneaded.
- the kneading temperature of the finish kneading step is, for example, above room temperature and less than 80 ° C.
- the kneading time is, for example, more than 1 minute and less than 15 minutes.
- a vulcanization accelerator, zinc oxide and the like may be appropriately added and kneaded as needed.
- the belt member is manufactured by topping the obtained rubber composition on both sides of a reinforcing cord (monofilament cord such as a steel cord) arranged in parallel (50 lines / 5 cm or more) at predetermined intervals. can do.
- a reinforcing cord monofilament cord such as a steel cord
- the tire of the present disclosure can be manufactured as an unvulcanized tire by molding the belt member obtained above together with other tire members by a usual method on a tire molding machine.
- the inner liner as a member to ensure the airtightness of the tire
- the carcass as a member to withstand the load, impact, and filling air pressure received by the tire
- the carcass as a member to withstand the filling air pressure
- a belt member or the like as a member to be raised is wound, both ends of the carcass are fixed to both side edges, and a bead part as a member for fixing the tire to the rim is arranged to form a tread shape, and then the outer circumference is formed.
- An unvulcanized tire is manufactured by attaching a tread to the central portion and a sidewall to the outside in the radial direction to form a side portion.
- the belt layer may be provided with a plurality of layers from the viewpoint of increasing the binding force on the running tread and facilitating the suppression of the growth of the outer diameter.
- the average distance D (mm) between the cords of the belt layers of each other in the tread portion is preferably 0.5 mm or less.
- the angle formed by the monofilament cord in the tread portion with the straight line parallel to the tire circumferential direction is 10 ° or more and 35 ° or less, and the cords of the adjacent belt layers may be arranged so as to intersect each other. preferable.
- the angle of the steel cord is the angle of the steel cord with respect to the tire circumferential direction when the tire is not filled with air, and can be confirmed by peeling the tread portion from the outside in the radial direction of the tire. ..
- the vulcanization step can be carried out by applying a known vulcanization means.
- the vulcanization temperature is, for example, more than 120 ° C. and less than 200 ° C.
- the vulcanization time is, for example, more than 5 minutes and less than 15 minutes.
- the tire is incorporated into a regular rim and is molded so as to satisfy the above (formula 1) and (formula 2) when the internal pressure is 250 kPa.
- Specific tires to which the present disclosure is preferably applied include, for example, 145 / 60R18, 145 / 60R19, 155 / 55R18, 155 / 55R19, 155 / 70R17, 155 / 70R19, 165 / 55R20, 165 / 55R21, and the like.
- Tires with size notation such as 165 / 60R19, 165 / 65R19, 165 / 70R18, 175 / 55R19, 175 / 55R20, 175 / 55R22, 175 / 60R18, 185 / 55R19, 185 / 60R20, 195 / 50R20, 195 / 55R20 Can be mentioned.
- the present embodiment can be used for various tires classified into passenger car tires, truck / bus tires, two-wheeled vehicle tires, etc., and among the tires that can satisfy (Equation 1) and (Equation 2).
- passenger car tires that is, tires that are mounted on automobiles traveling on four wheels and have a maximum load capacity of 1000 kg or less, and by satisfying (Equation 1) and (Equation 2), high-speed running Achieving both low rolling resistance and noise performance at times can more preferably contribute to solving the problem in the present disclosure of providing a sufficiently well-designed pneumatic tire.
- the maximum load capacity described above is not particularly limited as long as it is 1000 kg or less, but generally, as the maximum load capacity increases, the tire weight tends to increase and the impact transmitted to the tire tends to increase, so that the maximum load capacity tends to increase to 900 kg or less. It is preferably 800 kg or less, more preferably 700 kg or less, and further preferably 700 kg or less.
- the tire weight is preferably 20 kg or less, more preferably 15 kg or less, and further preferably 12 kg or less, 10 kg or less, and 8 kg or less from the viewpoint of softening the impact transmitted to the tire.
- the tire weight referred to here is the weight of the entire tire, and is the weight including the sealant, the sponge, the three-dimensional network structure, the electronic parts, and the like when the tire cavity surface is provided. Further, the tire weight can be appropriately adjusted by the thickness and width of each member constituting the tire, the specific weight of the rubber composition, the number of steel cords arranged in the belt reinforcing layer, the configuration of the bead wire, and the like.
- Blending materials First, each blending material shown below was prepared.
- (B) Blending materials other than rubber components (a) Carbon black-1: Show black N326 manufactured by Cabot Japan Co., Ltd. (N 2 SA: 78m 2 / g) (B) Carbon Black-2: Show Black N550 manufactured by Cabot Japan Co., Ltd. (N 2 SA: 42m 2 / g) (C) Curable resin component-1: PR12686 manufactured by Sumitomo Bakelite Co., Ltd. (Cashew oil modified phenolic resin) (D) Curable resin component-2: Sumikanol 620 manufactured by Taoka Chemical Industry Co., Ltd. (Modified resorcin resin) (E) Hardener: Sumikanol 507 manufactured by Taoka Chemical Industry Co., Ltd.
- Stearic acid Stearic acid "Camellia” manufactured by NOF CORPORATION
- Cross-linking agent, vulcanization accelerator, cross-linking aid Sulfur Powdered sulfur manufactured by Tsurumi Chemical Industry Co., Ltd.
- Vulcanization accelerator Noxeller NS-P (NS) manufactured by Ouchi Shinko Chemical Industry Co., Ltd.
- N-tert-butyl-2-benzothiazolyl sulphenamide Crosslinking aid: Duralink HTS manufactured by Flexis
- the belt members are laminated in two layers so that the steel cords in the belt member intersect each other at the angles shown in Tables 1 to 4 with respect to the straight line parallel to the tire circumferential direction.
- the unvulcanized tires were formed and press-vulcanized under the condition of 170 ° C. for 10 minutes to produce test tires of the sizes and weights shown in Tables 1 to 4.
- Tables 1 and 2 tires having a tire cross-sectional width Wt of more than 200 mm (Example 1-1 to Example 1-12 and Comparative Example 1-1 to Comparative Example 1-7), Table 3 and Table.
- No. 4 describes tires having a tire cross-sectional width Wt of 200 mm or less (Examples 2-1 to 2-12 and Comparative Examples 2-1 to 2-7).
- the above-mentioned (L 80 / L 0 ) is 0.5
- the total cross-sectional area of the circumferential groove is 22% of the cross-sectional area of the tread portion
- the groove width / groove depth is 0.
- the total volume of the lateral grooves including the lateral grooves of 65 was set to 3.5% of the volume of the tread portion.
- a rubber composition was cut out from the belt layers of each test tire to prepare a rubber test piece for viscoelasticity measurement having a length of 40 mm and a width of 4 mm. Tan ⁇ was measured under the conditions of ° C., initial strain: 5%, dynamic strain: ⁇ 1%, frequency: 10 Hz, and deformation mode: tension. The distance between the cords of the band and the belt and the results between the belts are shown in Tables 1 to 4. For those using the same rubber composition, the results of measuring the viscoelasticity of the rubber composition from each specification and obtaining the average value are shown.
- the present disclosure (1) is Pneumatic tire with tread and belt layer A monofilament cord is used as a reinforcing cord for the belt layer.
- the number of arrangements e (lines / 5 cm) of the monofilament cords per 5 cm in the tire width direction in the tire radial cross section of the belt layer, and the tire cross section width Wt (mm) when incorporated into the regular rim and the internal pressure is 250 kPa.
- Equation 1 e / (0.31Wt + 56.45) ⁇ 1 ...
- Equation 2 Equation 2
- This disclosure (2) is based on The pneumatic tire according to the present disclosure (1), characterized in that the tire cross-sectional width Wt is less than 200 mm and the following (Equation 3) is satisfied. e / (0.1924Wt + 37.88)> 1 ... (Equation 3)
- This disclosure (3) is The pneumatic tire according to the present disclosure (1) or (2), characterized in that the tire cross-sectional width Wt is less than 200 mm and the following (formula 4) is satisfied. e / (0.1335Wt + 49.644)> 1 ... (Equation 4)
- the present disclosure (4) is The number e (line / 5 cm) of the monofilament cords arranged per 5 cm in the tire width direction is more than 80 lines / 5 cm, and is an arbitrary combination with any of the disclosures (1) to (3). It is a pneumatic tire.
- the present disclosure (5) is In the belt layer, the rubber composition covering the reinforcing cord was measured under the conditions of temperature: 70 ° C., initial strain: 5%, kinetic strain: ⁇ 1%, frequency: 10 Hz, and deformation mode: tension.
- the present disclosure is characterized in that the loss tangent (tan ⁇ ) at the time and the average distance L (mm) between two monofilament cords adjacent to each other in the width direction in the tread portion satisfy the following (Equation 5).
- Equation 5 Pneumatic tires in any combination with any of (1) to (4).
- the present disclosure (6) is The angle between the reinforcing cord of the belt layer and the straight line parallel to the tire circumferential direction is 10 ° or more and 35 ° or less, which is optional from any of the present disclosures (1) to (5). It is a combination of pneumatic tires.
- the present disclosure (7) is At least two belt layers are provided, and the belt layer is provided. Any one of the present disclosures (1) to (6) is characterized in that at least one set of belt layers adjacent to each other in the radial direction of the tire is arranged at a distance of 0.5 mm or less. A combination of pneumatic tires.
- the present disclosure (8) is The monofilament cord is characterized in that the outer diameter of the cord is 0.1 mm or more and 0.5 mm or less, and is a pneumatic tire in any combination with any of the present disclosures (1) to (7).
- the present disclosure (9) is The tread has a circumferential groove that extends continuously in the tire circumferential direction.
- the ratio (L 80 / L 0 ) of the groove width L 80 at a depth of 80% of the maximum depth of the circumferential groove to the groove width L 0 of the circumferential groove on the ground plane of the tread portion is 0. It is a pneumatic tire of any combination with any of the present disclosures (1) to (8), characterized in that it is 3 or more and 0.7 or less.
- the present disclosure (10) is The tread section has multiple circumferential grooves that extend continuously in the tire circumferential direction.
- the total cross-sectional area of the plurality of circumferential grooves is 10% or more and 30% or less of the cross-sectional area of the tread portion, and is any of the present disclosures (1) to (9).
- the present disclosure (11) is The tread has multiple lateral grooves extending in the tire axis direction.
- the total volume of the plurality of lateral grooves is 2.0% or more and 5.0% or less of the volume of the tread portion, and is arbitrary from any of the present disclosures (1) to (10).
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Abstract
Description
トレッド部およびベルト層を備えた空気入りタイヤであって、
前記ベルト層は、補強コードとして、モノフィラメントコードが使用されており、
前記ベルト層のタイヤ半径方向断面における、タイヤ幅方向5cmあたりの前記モノフィラメントコードの配列本数e(本/5cm)と、正規リムに組み込まれ、内圧を250kPaとした際のタイヤ断面幅Wt(mm)とが、下記(式1)および(式2)を満足することを特徴とする空気入りタイヤである。
e/(0.31Wt+14.35)>1・・・・・・・(式1)
e/(0.31Wt+56.45)<1・・・・・・・(式2)
最初に、本開示に係る空気入りタイヤ(以下、単に「タイヤ」ともいう)の特徴について説明する。
本開示に係るタイヤは、トレッド部およびベルト層を備えた空気入りタイヤであり、ベルト層は、補強コードとして、モノフィラメントコードが使用されている。そして、ベルト層のタイヤ半径方向断面における、タイヤ幅方向5cmあたりのモノフィラメントコードの配列本数(以下、「エンズ」ともいう)e(本/5cm)と、正規リムに組み込まれ、内圧を250kPaとした際のタイヤ断面幅Wt(mm)とが、e/(0.31Wt+14.35)>1(式1)およびe/(0.31Wt+56.45)<1(式2)を満足している。
本開示に係るタイヤにおける効果発現のメカニズム、即ち、低転がり抵抗性と高速走行時のノイズ性能の両立が、十分に図られるメカニズムについては、以下のように推測される。
本開示に係るタイヤは、以下の態様を取ることにより、さらに大きな効果を得ることができる。
前記したように、モノフィラメントコード間の距離が短くなると、高周波数での共振も発生しやすくなり、高速走行時におけるノイズ性能の悪化が懸念される。
L={50-(d×e)}/(e-1)
ベルト層の補強コード(モノフィラメントコード)と、タイヤ周方向に平行な直線とのなす角度は、10°以上であることが好ましく、15°以上であるとより好ましく、20°以上であるとさらに好ましく、23°以上であるとさらに好ましい。一方、35°以下であることが好ましく、33°以下であるとより好ましく、30°以下であるとさらに好ましい。
本開示において、ベルト層は少なくとも2層設けられて多層化されており、タイヤ半径方向に隣り合う1組のベルト層の少なくとも1組において、トレッド部における互いのベルト層間の平均距離D(mm)は、0.5mm以下であることが好ましく、0.45mm以下であるとより好ましく、0.22mm以下であるとさらに好ましい。
本開示において、ベルト層よりもタイヤの径方向外側にベルト補強層が設けられていると、トレッド部の変形をさらに抑制して、高速走行時における低転がり抵抗性およびノイズ性能の両立を、より十分に図ることができ、好ましい。なお、このとき、ベルト層内のモノフィラメントコードとベルト補強層内のコードとの平均距離は、0.1mm以上、0.5mm以下とすることが好ましい。
本開示に係るタイヤは、タイヤ周方向に連続して延びる周方向溝をトレッド部に有しており、トレッド部の接地面における周方向溝の溝幅L0に対する周方向溝の最大の深さの80%の深さにおける溝幅L80の比(L80/L0)が、0.3以上、0.7以下であることが好ましい。これにより、トレッド部の陸部の底面で陸部全体の動きを抑制して、高速走行時における低転がり抵抗性とノイズ性能を両立させることができる。L80/L0は0.35以上であるとより好ましく、0.40以上であるとさらに好ましい。0.65以下であるとより好ましく、0.60以下であるとさらに好ましい。
以下、実施の形態に基づいて、本開示を具体的に説明する。
(1)配合材料
本開示に係るタイヤのベルト層において、モノフィラメントコードに被覆されるゴム組成物は、以下に記載するゴム成分、およびその他の配合材料から得ることができる。
本実施の形態において、ゴム成分としては特に限定されず、イソプレン系ゴム、ブタジエンゴム(BR)、スチレンブタジエンゴム(SBR)、ニトリルゴム(NBR)などのジエン系ゴム、ブチルゴムなどのブチル系ゴムなど、タイヤの製造に一般的に用いられるゴム(ポリマー)を用いることができる。これらの内でも、イソプレン系ゴムが好ましく、ポリイソプレンのシス構造が100%に近く、引張り強さが他のゴム成分より優れているという点で、NRを用いることが好ましい。なお、必要に応じて、BRやSBRを併せて使用してもよい。
ゴム成分100質量部中のイソプレン系ゴムの含有量(合計含有量)は、60質量部以上であることが好ましく、80質量部以上であるとより好ましく、90質量部以上であるとさらに好ましい。
本実施の形態において、ゴム成分には、必要に応じて、NRと共に、5質量部以上、25質量部以下のBRを使用してもよい。
また、本実施の形態において、ゴム成分には、必要に応じて、NRと共に、5~25質量部のSBRを使用してもよく、上記したBRと併用してもよい。
また、その他のゴム成分として、必要に応じて、ニトリルゴム(NBR)などのタイヤの製造に一般的に用いられるゴム(ポリマー)を含んでもよい。
(イ)充填剤
本実施の形態において、ゴム組成物は、充填剤を含有することが好ましい。具体的な充填剤としては、例えば、カーボンブラック、シリカ、グラファイト、炭酸カルシウム、タルク、アルミナ、クレー、水酸化アルミニウム、マイカなどが挙げられ、この内でも、カーボンブラックが、補強剤として好ましく使用できる。また、必要に応じて、補強剤として、シリカを使用することも好ましいが、この場合には、シランカップリング剤と併用することが好ましい。
ゴム組成物は、カーボンブラックを含むことが好ましい。カーボンブラックの含有量は、ゴム成分100質量部に対して、例えば、10質量部以上、100質量部以下であることが好ましく、40質量部以上、70質量部以下であるとより好ましく、50質量部以上、60質量部以下であるとさらに好ましい。
ゴム組成物は、必要に応じて、さらに、シリカを含むことが好ましい。シリカのBET比表面積は、良好な耐久性能が得られる観点から140m2/g超が好ましく、160m2/g超がより好ましい。一方、良好な低転がり抵抗性が得られる観点からは250m2/g未満が好ましく、220m2/g未満であることがより好ましい。
前記したように、シリカの使用に際しては、シランカップリング剤を併用することも可能である。シランカップリング剤としては、特に限定されず、例えば、ビス(3-トリエトキシシリルプロピル)テトラスルフィド、ビス(2-トリエトキシシリルエチル)テトラスルフィド、ビス(4-トリエトキシシリルブチル)テトラスルフィド、ビス(3-トリメトキシシリルプロピル)テトラスルフィド、ビス(2-トリメトキシシリルエチル)テトラスルフィド、ビス(2-トリエトキシシリルエチル)トリスルフィド、ビス(4-トリメトキシシリルブチル)トリスルフィド、ビス(3-トリエトキシシリルプロピル)ジスルフィド、ビス(2-トリエトキシシリルエチル)ジスルフィド、ビス(4-トリエトキシシリルブチル)ジスルフィド、ビス(3-トリメトキシシリルプロピル)ジスルフィド、ビス(2-トリメトキシシリルエチル)ジスルフィド、ビス(4-トリメトキシシリルブチル)ジスルフィド、3-トリメトキシシリルプロピル-N,N-ジメチルチオカルバモイルテトラスルフィド、2-トリエトキシシリルエチル-N,N-ジメチルチオカルバモイルテトラスルフィド、3-トリエトキシシリルプロピルメタクリレートモノスルフィド、などのスルフィド系、3-メルカプトプロピルトリメトキシシラン、2-メルカプトエチルトリエトキシシラン、Momentive社製のNXT、NXT-Zなどのメルカプト系、ビニルトリエトキシシラン、ビニルトリメトキシシランなどのビニル系、3-アミノプロピルトリエトキシシラン、3-アミノプロピルトリメトキシシランなどのアミノ系、γ-グリシドキシプロピルトリエトキシシラン、γ-グリシドキシプロピルトリメトキシシランなどのグリシドキシ系、3-ニトロプロピルトリメトキシシラン、3-ニトロプロピルトリエトキシシランなどのニトロ系、3-クロロプロピルトリメトキシシラン、3-クロロプロピルトリエトキシシランなどのクロロ系などがあげられる。これらは、単独で用いてもよく、2種以上を併用してもよい。
ゴム組成物には、上記したカーボンブラック、シリカの他に、タイヤ工業において一般的に用いられている、例えば、グラファイト、炭酸カルシウム、タルク、アルミナ、クレー、水酸化アルミニウム、マイカ等の充填剤をさらに含有してもよい。これらの含有量は、ゴム成分100質量部に対して、例えば、0.1質量部超、200質量部未満である。
ゴム組成物は、変性レゾルシン樹脂、変性フェノール樹脂などの硬化性樹脂成分を含有することが好ましい。これにより、発熱性、破断時伸びを大きく悪化させることなく、スチールコードとの接着性を向上させ、ゴム、モノフィラメントコード(例えば、スチールコード)で大きな反力を発生させ易くすることができる。
ゴム組成物は、加工性(粘着性付与)の観点から、必要に応じて、樹脂成分を含有することが好ましい。樹脂成分は、常温で固体であっても、液体であってもよく、具体的な樹脂成分としては、例えば、ロジン系樹脂、スチレン系樹脂、クマロン系樹脂、テルペン系樹脂、C5樹脂、C9樹脂、C5C9樹脂、アクリル系樹脂などの樹脂が挙げられ、2種以上を併用しても良い。樹脂成分の含有量は、ゴム成分100質量部に対して、2質量部超で、45質量部未満が好ましく、30質量部未満がより好ましい。
ゴム組成物は、有機酸コバルトを含有することが好ましい。有機酸コバルトは、コードとゴムとを架橋する役目を果たすため、この成分を配合することにより、コードとゴムとの接着性を向上させることができる。
ゴム組成物は、必要に応じて、リバージョン(加硫戻り)防止剤を含有していることが好ましい。これにより、リバージョンが抑制されて、耐久性が向上する。リバージョン防止剤の含有量は、ゴム成分100質量部に対して、0.1質量部以上、3質量部以下が好ましく、0.2質量部以上、2.5質量部以下であるとより好ましく、0.3質量部以上、2質量部以下であるとさらに好ましい。なお、具体的なリバージョン防止剤としては、例えばフレクシス社製のパーカリンク900(1,3-ビス(シトラコンイミドメチル)ベンゼン)などを使用できる。
ゴム組成物は、老化防止剤を含むことが好ましい。老化防止剤の含有量は、ゴム成分100質量部に対して、例えば、1質量部超、10質量部未満である。
ゴム組成物は、ステアリン酸を含んでもよい。ステアリン酸の含有量は、ゴム成分100質量部に対して、例えば、0.5質量部超、10.0質量部未満である。ステアリン酸としては、従来公知のものを使用でき、例えば、日油(株)、NOF社、花王(株)、富士フイルム和光純薬(株)、千葉脂肪酸(株)等の製品を使用できる。
ゴム組成物は、酸化亜鉛を含んでもよい。酸化亜鉛の含有量は、ゴム成分100質量部に対して、例えば、0.5質量部超、15質量部未満である。酸化亜鉛としては、従来公知のものを使用でき、例えば、三井金属鉱業(株)、東邦亜鉛(株)、ハクスイテック(株)、正同化学工業(株)、堺化学工業(株)等の製品を使用できる。
ゴム組成物は、硫黄等の架橋剤を含むことが好ましい。架橋剤の含有量は、ゴム成分100質量部に対して、例えば、0.1質量部超、10.0質量部未満である。
ゴム組成物には、前記成分の他、タイヤ工業において一般的に用いられている添加剤、例えば、脂肪酸金属塩、カルボン酸金属塩、有機過酸化物等を更に配合してもよい。これらの添加剤の含有量は、ゴム成分100質量部に対して、例えば、0.1質量部超、200質量部未満である。
前記ゴム組成物は、一般的な方法、例えば、ゴム成分とカーボンブラック等のフィラーとを混練するベース練り工程と、前記ベース練り工程で得られた混練物と架橋剤とを混練する仕上げ練り工程とを含む製造方法により作製される。
ベルト部材は、得られたゴム組成物を、所定の間隔で並列に配置(50本/5cm以上)された補強コード(スチールコードなどのモノフィラメントコード)の両面にトッピングすることにより製造することができる。
本開示のタイヤは、上記で得られたベルト部材を他のタイヤ部材と共に、タイヤ成型機上にて通常の方法で成形することにより、未加硫タイヤとして作製することができる。
V(mm3)={(Dt/2)2-(Dt/2-Ht)2}×π×Wt
WL(kg)=0.000011×V+175
最初に、ベルト用ゴム組成物の製造を行った。
まず、以下に示す各配合材料を準備した。
NR:RSS3
(イ)カーボンブラック-1:キャボットジャパン(株)製のショウブラックN326
(N2SA:78m2/g)
(ロ)カーボンブラック-2:キャボットジャパン(株)製のショウブラックN550
(N2SA:42m2/g)
(ハ)硬化性樹脂成分-1:住友ベークライト(株)製のPR12686
(カシューオイル変性フェノール樹脂)
(ニ)硬化性樹脂成分-2:田岡化学工業(株)製のスミカノール620
(変性レゾルシン樹脂)
(ホ)硬化剤:田岡化学工業(株)製のスミカノール507
(メチレン供与体)
(ヘ)有機酸コバルト:DIC(株)製のDICNATE NBC-2
(ネオデカン酸ホウ素コバルト、コバルト含有量22.5質量%)
(ト)酸化亜鉛:三井金属鉱業(株)製の亜鉛華1号
(チ)老化防止剤-1:大内新興化学工業(株)製のノクラック6C
(N-フェニル-N′-(1,3-ジメチルブチル)-p-フェニレンジアミン)
(リ)老化防止剤-2:川口化学工業(株)製のアンテージRD
(2,2,4-トリメチル-1,2-ジヒドロキノリン)
(ヌ)ステアリン酸:日油(株)製のステアリン酸「椿」
(ル)架橋剤および加硫促進剤、架橋助剤
硫黄:鶴見化学工業(株)製の粉末硫黄
加硫促進剤:大内新興化学工業(株)製のノクセラー NS-P(NS)
(N-tert-ブチル-2-ベンゾチアゾリルスルフェンアミド)
架橋助剤:フレクシス社製のデュラリンクHTS
表1~表4に示す各配合内容に従い、バンバリーミキサーを用いて、硬化剤、硫黄および加硫促進剤以外の材料を150℃の条件下で5分間混練りして、混練物を得た。なお、各配合量は、質量部である。
まず、表1~表4に示す構成およびコード外径(mm)のスチールコードを、表1~表4に示すエンズ(本/5cm)で配列させた後、先に得られたベルト用ゴム組成物をその両面に被覆してベルト部材を作製した。このとき、ベルト部材の厚さ方向中央にスチールコードが配されるように、上下に同量のゴムをトッピングすると共に、加硫後のタイヤにおいて、1組のベルト層間でスチールコードが、表1~4に示す平均距離D(mm)となる様に、厚さを適宜調整した。
その後、各試験用タイヤの断面幅Wt(mm)を求め、「0.31Wt+14.35」、「0.31Wt+56.45」を算出した。そして、隣り合う2本のスチールコードのコード外径(mm)およびエンズe(本/5cm)に基づいて、隣り合う2本のスチールコード間の平均距離L(mm)を算出した。
(1)高速走行時の転がり抵抗の評価
各試験用タイヤを車両(国産のFF車、排気量2000cc)の全輪に装着させて、内圧が250kPaとなるように空気を充填した後、乾燥路面のテストコース上を、100km/hの速度で10km周回した後、アクセルを離し、アクセルをオフにしてから車両が止まるまでの距離を、転がり抵抗として計測した。
転がり抵抗=
[(試験用タイヤの結果)/(比較例1-7または比較例2-7の結果)]
×100
各試験用タイヤを車両(国産のFF車、排気量2000cc)の全輪に装着させて、乾燥路面のテストコース上を、100km/hの速度で走行し、ドライバーが窓際でノイズについて、5段階で官能検査した。
ノイズ性能=
[(比較例1-4または比較例2-4の結果)/(試験用タイヤの結果)]
×100
上記(1)、(2)の評価結果を合計して総合評価とした。
各評価の結果を、表1~表4に示す。
トレッド部およびベルト層を備えた空気入りタイヤであって、
前記ベルト層は、補強コードとして、モノフィラメントコードが使用されており、
前記ベルト層のタイヤ半径方向断面における、タイヤ幅方向5cmあたりの前記モノフィラメントコードの配列本数e(本/5cm)と、正規リムに組み込まれ、内圧を250kPaとした際のタイヤ断面幅Wt(mm)とが、下記(式1)および(式2)を満足することを特徴とする空気入りタイヤである。
e/(0.31Wt+14.35)>1・・・・・・・(式1)
e/(0.31Wt+56.45)<1・・・・・・・(式2)
前記タイヤ断面幅Wtが、200mm未満であり、下記(式3)を満足することを特徴とし、本開示(1)に記載の空気入りタイヤである。
e/(0.1924Wt+37.88)>1・・・・・(式3)
前記タイヤ断面幅Wtが200mm未満であり、下記(式4)を満足することを特徴とし、本開示(1)または(2)に記載の空気入りタイヤである。
e/(0.1335Wt+49.644)>1・・・・(式4)
前記タイヤ幅方向5cmあたりの前記モノフィラメントコードの配列本数e(本/5cm)が、80本/5cmよりも多いことを特徴とし、本開示(1)から(3)のいずれかとの任意の組合せの空気入りタイヤである。
前記ベルト層において、前記補強コードを被覆しているゴム組成物を、温度:70℃、初期歪:5%、動歪:±1%、周波数:10Hz、変形モード:引張の条件下で測定したときの損失正接(tanδ)と、前記トレッド部における幅方向に隣り合う2本の前記モノフィラメントコード間の平均距離L(mm)とが、下記(式5)を満足することを特徴とし、本開示(1)から(4)のいずれかとの任意の組合せの空気入りタイヤである。
L×tanδ>0.017・・・・・(式5)
前記ベルト層の前記補強コードと、タイヤ周方向に平行な直線とのなす角度が、10°以上、35°以下であることを特徴とし、本開示(1)から(5)のいずれかとの任意の組合せの空気入りタイヤである。
前記ベルト層が少なくとも2層設けられており、
タイヤ半径方向に隣り合う1組のベルト層の少なくとも1組が、0.5mm以下の距離を隔てて配置されていることを特徴とし、本開示(1)から(6)のいずれかとの任意の組合せの空気入りタイヤである。
前記モノフィラメントコードのコード外径が、0.1mm以上、0.5mm以下であることを特徴とし、本開示(1)から(7)のいずれかとの任意の組合せの空気入りタイヤである。
タイヤ周方向に連続して延びる周方向溝をトレッド部に有しており、
前記トレッド部の接地面における前記周方向溝の溝幅L0に対する前記周方向溝の最大の深さの80%の深さにおける溝幅L80の比(L80/L0)が、0.3以上、0.7以下であることを特徴とし、本開示(1)から(8)のいずれかとの任意の組合せの空気入りタイヤである。
タイヤ周方向に連続して延びる複数本の周方向溝をトレッド部に有しており、
前記複数本の周方向溝の断面積の合計が、前記トレッド部の断面積の10%以上、30%以下であることを特徴とし、本開示(1)から(9)のいずれかとの任意の組合せの空気入りタイヤである。
タイヤ軸方向に延びる複数本の横溝をトレッド部に有しており、
前記複数本の横溝の容積の合計が、前記トレッド部の体積の2.0%以上、5.0%以下であることを特徴とし、本開示(1)から(10)のいずれかとの任意の組合せの空気入りタイヤである。
Claims (11)
- トレッド部およびベルト層を備えた空気入りタイヤであって、
前記ベルト層は、補強コードとして、モノフィラメントコードが使用されており、
前記ベルト層のタイヤ半径方向断面における、タイヤ幅方向5cmあたりの前記モノフィラメントコードの配列本数e(本/5cm)と、正規リムに組み込まれ、内圧を250kPaとした際のタイヤ断面幅Wt(mm)とが、下記(式1)および(式2)を満足することを特徴とする空気入りタイヤ。
e/(0.31Wt+14.35)>1・・・・・(式1)
e/(0.31Wt+56.45)<1・・・・・(式2) - 前記タイヤ断面幅Wtが、200mm未満であり、下記(式3)を満足することを特徴とする請求項1に記載の空気入りタイヤ。
e/(0.1924Wt+37.88)>1・・・・・(式3) - 前記タイヤ断面幅Wtが200mm未満であり、下記(式4)を満足することを特徴とする請求項1または請求項2に記載の空気入りタイヤ。
e/(0.1335Wt+49.644)>1・・・・・(式4) - 前記タイヤ幅方向5cmあたりの前記モノフィラメントコードの配列本数e(本/5cm)が、80本/5cmよりも多いことを特徴とする請求項1ないし請求項3のいずれか1項に記載の空気入りタイヤ。
- 前記ベルト層において、前記補強コードを被覆しているゴム組成物を、温度:70℃、初期歪:5%、動歪:±1%、周波数:10Hz、変形モード:引張の条件下で測定したときの損失正接(tanδ)と、前記トレッド部における幅方向に隣り合う2本の前記モノフィラメントコード間の平均距離L(mm)とが、下記(式5)を満足することを特徴とする請求項1ないし請求項4のいずれか1項に記載の空気入りタイヤ。
L×tanδ>0.017・・・・・(式5) - 前記ベルト層の前記補強コードと、タイヤ周方向に平行な直線とのなす角度が、10°以上、35°以下であることを特徴とする請求項1ないし請求項5のいずれか1項に記載の空気入りタイヤ。
- 前記ベルト層が少なくとも2層設けられており、
タイヤ半径方向に隣り合う1組のベルト層の少なくとも1組が、0.5mm以下の距離を隔てて配置されていることを特徴とする請求項1ないし請求項6のいずれか1項に記載の空気入りタイヤ。 - 前記モノフィラメントコードのコード外径が、0.1mm以上、0.5mm以下であることを特徴とする請求項1ないし請求項7のいずれか1項に記載の空気入りタイヤ。
- タイヤ周方向に連続して延びる周方向溝をトレッド部に有しており、
前記トレッド部の接地面における前記周方向溝の溝幅L0に対する前記周方向溝の最大の深さの80%の深さにおける溝幅L80の比(L80/L0)が、0.3以上、0.7以下であることを特徴とする請求項1ないし請求項8のいずれか1項に記載の空気入りタイヤ。 - タイヤ周方向に連続して延びる複数本の周方向溝をトレッド部に有しており、
前記複数本の周方向溝の断面積の合計が、前記トレッド部の断面積の10%以上、30%以下であることを特徴とする請求項1ないし請求項9のいずれか1項に記載の空気入りタイヤ。 - タイヤ軸方向に延びる複数本の横溝をトレッド部に有しており、
前記複数本の横溝の容積の合計が、前記トレッド部の体積の2.0%以上、5.0%以下であることを特徴とする請求項1ないし請求項10のいずれか1項に記載の空気入りタイヤ。
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JP2010126123A (ja) * | 2008-12-01 | 2010-06-10 | Bridgestone Corp | 空気入りタイヤ |
JP2012254668A (ja) * | 2011-06-07 | 2012-12-27 | Yokohama Rubber Co Ltd:The | 乗用車用空気入りラジアルタイヤ |
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JP6769573B1 (ja) * | 2020-02-28 | 2020-10-14 | 住友ゴム工業株式会社 | タイヤ |
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