WO2014203908A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2014203908A1 WO2014203908A1 PCT/JP2014/066066 JP2014066066W WO2014203908A1 WO 2014203908 A1 WO2014203908 A1 WO 2014203908A1 JP 2014066066 W JP2014066066 W JP 2014066066W WO 2014203908 A1 WO2014203908 A1 WO 2014203908A1
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- WO
- WIPO (PCT)
- Prior art keywords
- belt
- belt ply
- pneumatic tire
- ply
- outermost layer
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/04—Bead cores
-
- 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
- B60C9/02—Carcasses
-
- 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
- B60C2009/0071—Reinforcements or ply arrangement of pneumatic tyres characterised by special physical properties of the reinforcements
-
- 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
- B60C2009/1871—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers with flat cushions or shear layers between 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
- B60C2009/2012—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers
- B60C2009/2016—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers comprising cords at an angle of 10 to 30 degrees to the circumferential direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2048—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 special physical properties of the belt plies
- B60C2009/2051—Modulus of the ply
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- 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
- B60C2009/2064—Modulus; Hardness; Loss modulus or "tangens delta"
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—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
- B60C2009/2067—Thickness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- 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
- B60C2009/2093—Elongation of the reinforcements at break point
-
- 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
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/06—Tyres specially adapted for particular applications for heavy duty vehicles
Definitions
- the present invention relates to a pneumatic tire, and more particularly to a pneumatic tire that can improve durability.
- Patent Document 1 the technique described in Patent Document 1 is known as a conventional radial tire for construction vehicles.
- An object of the present invention is to provide a pneumatic tire capable of improving durability performance.
- a pneumatic tire according to the present invention includes a pair of bead cores, a carcass layer spanned between the pair of bead cores, and a steel belt cord covered with a coat rubber.
- a pneumatic tire configured by laminating a belt ply and having a belt layer disposed on the outer side in the tire radial direction of the carcass layer, wherein the belt ply disposed on the outermost side in the tire radial direction is the outermost layer.
- the belt ply is called an adjacent belt ply and is adjacent to the outermost belt ply
- the belt ply is disposed between the outermost belt ply and the adjacent belt ply.
- the inter-cord distance Ga is outside the belt cord in the outermost layer belt ply and the adjacent belt ply.
- the maximum value [phi] max and characterized by having a relation of 0.80 ⁇ Ga / ⁇ max ⁇ 1.80.
- FIG. 1 is a sectional view in the tire meridian direction showing a pneumatic tire according to an embodiment of the present invention.
- FIG. 2 is an explanatory view showing a belt layer of the pneumatic tire shown in FIG.
- FIG. 3 is an explanatory view showing a belt layer of the pneumatic tire shown in FIG. 1.
- FIG. 4 is an explanatory diagram illustrating a belt layer of the pneumatic tire illustrated in FIG. 1.
- FIG. 5 is an explanatory view showing a modified example of the pneumatic tire shown in FIG. 1.
- FIG. 6 is an explanatory view showing a modified example of the pneumatic tire shown in FIG. 1.
- FIG. 7 is a chart showing the results of the performance test of the pneumatic tire according to the embodiment of the present invention.
- FIG. 1 is a sectional view in the tire meridian direction showing a pneumatic tire according to an embodiment of the present invention. This figure shows one side region of a sectional view in the tire radial direction. In addition, this figure shows a radial tire for construction vehicles called an OR tire (Off the Road Tire) as an example of a pneumatic tire.
- an OR tire Off the Road Tire
- the cross section in the tire meridian direction means a cross section when the tire is cut along a plane including the tire rotation axis (not shown).
- Reference sign CL denotes a tire equator plane, which is a plane that passes through the center point of the tire in the tire rotation axis direction and is perpendicular to the tire rotation axis.
- the tire width direction means a direction parallel to the tire rotation axis
- the tire radial direction means a direction perpendicular to the tire rotation axis.
- the pneumatic tire 1 has an annular structure centered on the tire rotation axis, and includes a pair of bead cores 11, a pair of bead fillers 12, 12, a carcass layer 13, a belt layer 14, and a tread rubber 15. And a pair of sidewall rubbers 16 and 16 and a pair of rim cushion rubbers 17 and 17 (see FIG. 1).
- the boundaries of the bead filler 12, the tread rubber 15, the side wall rubber 16, and the rim cushion rubber 17 are omitted.
- the pair of bead cores 11 and 11 is an annular member formed by bundling a plurality of bead wires, and constitutes the core of the left and right bead portions.
- the pair of bead fillers 12 and 12 are disposed on the outer periphery in the tire radial direction of the pair of bead cores 11 and 11 to reinforce the bead portion.
- the carcass layer 13 is bridged in a toroidal shape between the left and right bead cores 11 and 11 to form a tire skeleton. Further, both ends of the carcass layer 13 are wound and locked from the inner side in the tire width direction to the outer side in the tire width direction so as to wrap the bead core 11 and the bead filler 12.
- the carcass layer 13 is formed by coating a plurality of carcass cords made of steel with a coating rubber and rolling the carcass cord, and a carcass angle of 85 [deg] or more and 95 [deg] or less in absolute value (carcass cord with respect to the tire circumferential direction). Of the fiber direction).
- the belt layer 14 is formed by laminating at least four belt plies 141 to 144, and is arranged around the outer periphery of the carcass layer 13. In a general OR tire, 4 to 8 belt plies are laminated to form a belt layer 14 (not shown). The structure of the belt layer 14 will be described later.
- the tread rubber 15 is disposed on the outer circumference in the tire radial direction of the carcass layer 13 and the belt layer 14 to constitute a tread portion of the tire.
- the pair of side wall rubbers 16 and 16 are respectively arranged on the outer side in the tire width direction of the carcass layer 13 to constitute left and right side wall portions.
- the pair of rim cushion rubbers 17, 17 are respectively disposed on the inner side in the tire radial direction of the wound portions of the left and right bead cores 11, 11 and the carcass layer 13, and constitute the contact surfaces of the left and right bead portions with respect to the rim flange.
- FIG. 2 and 3 are explanatory views showing a belt layer of the pneumatic tire shown in FIG.
- FIG. 2 shows an enlarged view of the end region of the belt layer 14.
- FIG. 3 shows a laminated structure of the belt layer 14.
- hatching described in each of the belt plies 141 to 144 schematically shows the arrangement configuration of the belt cords.
- the belt layer 14 is composed of four laminated belt plies 141 to 144, and is arranged around the outer periphery of the carcass layer 13.
- these belt plies 141 to 144 are referred to as a first belt 141, a second belt 142, a third belt 143, and a fourth belt 144 in order from the inner side in the tire radial direction.
- the belt ply arranged on the outermost side in the tire radial direction is called an outermost layer belt ply
- the belt ply arranged adjacent to the outermost layer belt ply in the tire radial direction is called an adjacent belt ply.
- the fourth belt 144 is the outermost belt ply
- the third belt 143 is the adjacent belt ply.
- Each belt ply 141 to 144 is a member formed by rolling a steel cord covered with a coat rubber (see FIG. 3).
- the belt angle of the outermost layer belt ply 144 is the smallest among the belt angles of all the belt plies 141 to 144. At this time, the belt angle of the outermost layer belt ply 144 may be the same as the belt angle of any other belt ply.
- the belt angle of the outermost layer belt ply 144 is preferably in the range of 16 [deg] or more and 20 [deg] or less in absolute value.
- the difference in absolute value between the belt angle of the outermost layer belt ply 144 and the belt angle of the adjacent belt ply 143 is 3 [deg] or more.
- the belt plies 141 to 144 have different belt angles with respect to the adjacent belt plies, and are laminated with the inclination direction of the belt cords alternately and horizontally reversed. Thereby, a cross-ply structure is formed, and the structural strength of the belt layer 14 is increased.
- the outer diameter ⁇ of the belt cords of the belt plies 141 to 144 is in the range of 1.50 [mm] ⁇ ⁇ ⁇ 6.00 [mm].
- the belt cords of the belt plies 141 to 144 may have the same outer diameter ⁇ or may have different outer diameters ⁇ .
- the outer diameter of the belt cord is measured as the diameter of a circumscribed circle in a sectional view in the radial direction of the belt cord in a configuration including a plurality of cords in which the belt cord is wound.
- the breaking elongation E of the belt cords of the belt plies 141 to 144 is in the range of 270 [%] ⁇ E ⁇ 410 [%].
- the elongation at break is measured by a tensile test at a tensile speed of 2 [mm / min] using a tensile tester (INSTRON 5585H, manufactured by Instron) according to JIS-K7161.
- the modulus Mb when the coated rubber of the belt plies 141 to 144 is 100% stretched is in the range of 3.0 [MPa] ⁇ Mb ⁇ 4.5 [MPa].
- the modulus is measured by a tensile test at room temperature according to JIS-K6251 (using No. 3 dumbbell).
- the second belt 142 has the widest structure
- the fourth belt 144 which is the outermost layer belt ply has the narrowest structure.
- the first belt 141 has a narrower structure than the second belt 142.
- the third belt 143 has a structure that is narrower than the second belt 142 and wider than the fourth belt 144.
- belt edge cushions 19 and 19 are sandwiched between the left and right ends of the first belt 141 and the second belt 142 and between the left and right ends of the third belt 143 and the second belt 142, respectively. Are arranged. Therefore, the end portion of the first belt 141 and the end portion of the third belt 143 are arranged apart from the second belt 142. Further, the modulus Mc of the belt edge cushion 19 preferably has a relationship of Mc ⁇ Mb and more preferably has a relationship of Mc ⁇ Mb with respect to the modulus Mb of the coat rubber of the adjacent belt ply. Thereby, the stress concentration at the end of the belt ply is relaxed, and the occurrence of separation is suppressed.
- FIG. 4 is an explanatory diagram illustrating a belt layer of the pneumatic tire illustrated in FIG. 1. This figure schematically shows the arrangement structure of belt cords and coat rubbers constituting the belt plies 141 to 144.
- this pneumatic tire 1 has the following bead structure in order to improve the durability performance (see FIG. 4).
- an inter-cord distance Ga between the fourth belt 144 that is the outermost belt ply and the third belt 143 that is the adjacent belt ply is defined.
- the distance between cords is the thickness of the rubber material between belt cords in adjacent belt plies, and is measured in a no-load state in which a tire is mounted on a prescribed rim and filled with a prescribed internal pressure.
- a single tire is applied to a virtual line of a tire profile measured by a laser profiler and fixed with a tape or the like.
- Etc. and the numerical value is taken as the distance between codes.
- the laser profiler for example, a tire profile measuring device (manufactured by Matsuo Corporation) is used.
- Specified rim means “Applied rim” defined in JATMA, “Design Rim” defined in TRA, or “Measuring Rim” defined in ETRTO.
- the specified internal pressure means “maximum air pressure” specified by JATMA, the maximum value of “TIRE LOAD LIMITS AT VARIOUS COLD INFLATIONLPRESSURES” specified by TRA, or “INFLATION PRESSURES” specified by ETRTO.
- the specified load means the “maximum load capacity” defined by JATMA, the maximum value of “TIRE LOAD LIMITS AT VARIOUS COLD INFUREATION PRESSURES” prescribed by TRA, or “LOAD CAPACITY” prescribed by ETRTO.
- the specified internal pressure is air pressure 180 [kPa]
- the specified load is 88 [%] of the maximum load capacity.
- the maximum value ⁇ max of the outer diameter of the belt cord in the outermost layer belt ply and the adjacent belt ply is defined. Therefore, in the configuration of FIG. 4, the outer diameter ⁇ 4 of the belt cord 1441 of the fourth belt 144 is compared with the outer diameter ⁇ 3 of the belt cord 1431 of the third belt 143, and the larger one is selected as the maximum value ⁇ max. .
- the inter-cord distance Ga between the outermost layer belt ply 144 and the adjacent belt ply 143 and the maximum value ⁇ max of the outer diameter of the belt cord have a relationship of 0.80 ⁇ Ga / ⁇ max ⁇ 1.80.
- the ratio Ga / ⁇ max is preferably in the range of 1.30 ⁇ Ga / ⁇ max ⁇ 1.80.
- a cord distance (not shown) between the adjacent belt plies 141 and 142 (142 and 143) of another set and a belt of a pair of belt plies 141 and 142 (142 and 143) forming the distance between the cords.
- the ratio with the maximum value of the outer diameter of the cord is preferably in the range of 0.3 to 0.7. Therefore, the ratio between the cord distance between adjacent belt plies and the maximum value of the outer diameter of the belt cord is set to be the largest between the outermost belt ply 144 and the adjacent belt ply 143.
- the inter-cord distance Ga between the outermost belt ply 144 and the adjacent belt ply 143 is substantially constant in the region where the outermost belt ply 144 is disposed. It has become. For this reason, the ratio Ga / ⁇ max is set in the above-mentioned range in the entire arrangement region of the outermost layer belt ply 144.
- the present invention is not limited to this, and the inter-cord distance Ga and the ratio Ga / ⁇ max between the outermost belt ply 144 and the adjacent belt ply 143 are set within the above ranges at least at both ends of the outermost belt ply 144. It should be. Thereby, the separation at the end of the outermost layer belt ply 144 that is particularly likely to occur can be effectively suppressed.
- the belt layer 14 includes a buffer rubber 146.
- the buffer rubber 146 is a member that is disposed between the outermost layer belt ply 144 and the adjacent belt ply 143 to adjust the inter-cord distance Ga.
- the modulus Md of the buffer rubber 146 preferably has a relationship of Md ⁇ Mb with respect to the modulus Mb of the coat rubber 1442 of the outermost layer belt ply 144, and more preferably has a relationship of Md ⁇ Mb. preferable.
- the modulus Md of the buffer rubber 146 is preferably in the range of 3.0 [MPa] ⁇ Md ⁇ 4.0 [MPa].
- the gauge Ga ′ (not shown) of the buffer rubber 146 is 0.45 ⁇ Ga ′ / ⁇ max ⁇ 1. With respect to the maximum value ⁇ max of the outer diameter of the belt cord in the outermost layer belt ply 144 and the adjacent belt ply 143. It is preferable to have a relationship of 00.
- the buffer rubber 146 is wider than the outermost belt ply 144 and narrower than the adjacent belt ply 143, and is arranged over the entire area of the outermost belt ply 144. Further, the buffer rubber 146 has a single structure and has a uniform gauge Ga '.
- FIG. 5 and 6 are explanatory views showing a modification of the pneumatic tire shown in FIG.
- FIG. 5 shows an enlarged view of the end region of the belt layer 14.
- FIG. 6 schematically shows an arrangement structure of belt cords and coat rubbers constituting the belt plies 141 to 144.
- the belt layer 14 may have a protective layer 147 as shown in FIG.
- the protective layer 147 is disposed so as to cover the outer side of the outermost layer belt ply 144 in the tire radial direction, and protects the other belt plies 141 to 144. Further, the protective layer 147 is formed by coating a steel cord with a coat rubber and rolling it, and as shown in FIG. 5, is disposed so as to cover the entire belt width of the other belt plies 141 to 144 constituting the strength member.
- the protective layer 147 is different from the other belt plies 141 to 144 in that it is a steel cord belt ply having a breaking elongation of 3% or more.
- the belt layer 14 is provided between the outermost layer belt ply 144 and the adjacent belt ply 143 and includes the buffer rubber 146 for adjusting the inter-cord distance Ga. ing.
- Such a configuration is preferable in that the inter-cord distance Ga can be easily adjusted.
- the present invention is not limited to this, and as shown in FIG. 6, even if the inter-cord distance Ga is adjusted by omitting the buffer rubber 146 and increasing the thicknesses of the coating rubbers 1442 and 1432 of the belt plies 144 and 143, good.
- the pneumatic tire 1 includes at least a pair of bead cores 11 and 11, a carcass layer 13 spanned between the pair of bead cores 11 and 11, and a steel belt cord covered with a coat rubber.
- the belt layer 14 is configured by laminating four belt plies 141 to 144 and disposed on the outer side in the tire radial direction of the carcass layer 13 (see FIGS. 1 to 3).
- the inter-cord distance Ga between the outermost layer belt ply (fourth belt 144) and the adjacent belt ply (third belt 143) is such that the outermost belt ply 144 and the adjacent belt ply 143 are outside the belt cords 1431 and 1441.
- the maximum value ⁇ max of the diameters ⁇ 3 and ⁇ 4 has a relationship of 0.80 ⁇ Ga / ⁇ max ⁇ 1.80 (see FIG. 4).
- the maximum values ⁇ max of the outer diameters ⁇ 4 and ⁇ 3 of the belt cords 1441 and 1431 are preferably in the range of 1.50 [mm] ⁇ ⁇ max ⁇ 6.00, and 1.55 [ mm] ⁇ ⁇ max ⁇ 5.00 [mm] is more preferable (see FIG. 4). Accordingly, there is an advantage that the outer diameters ⁇ 4 and ⁇ 3 of the belt cords 1441 and 1431 are optimized.
- the modulus Mb when the coat rubber 1442 of the outermost belt ply 144 is 100% elongated is preferably in the range of 3.0 [MPa] ⁇ Mb ⁇ 4.5 [MPa] It is more preferable to be in the range of 3.3 [MPa] ⁇ Mb ⁇ 4.3 [MPa].
- the breaking elongation E of the belt cord 1441 of the outermost layer belt ply 144 is preferably in the range of 270 [%] ⁇ E ⁇ 410 [%], and 290 [%] ⁇ E ⁇ . More preferably, it is in the range of 390 [%].
- the belt angle ⁇ 4 (not shown) of the outermost layer belt ply 144 is the smallest among the belt angles ⁇ of all the belt plies 141 to 144. Therefore, the outermost layer belt has the lowest angle, and no belt has the same angle. Thereby, there exists an advantage which can obtain the tag effect by outermost layer belt ply 144 effectively.
- the belt angle ⁇ 4 of the outermost layer belt ply 144 is in the range of 16 [deg] or more and 20 [deg] or less in absolute value.
- the belt angle ⁇ 4 of the outermost layer belt ply 144 is optimized. That is, when the belt angle ⁇ 4 is 16 [deg] or more, the tagging effect by the outermost layer belt ply 144 is ensured. Further, when the belt angle ⁇ 4 is 20 [deg] or less, the strength of the outermost layer belt ply 144 is appropriately secured.
- the outermost layer belt ply 144 and the adjacent belt ply 143 have belt angles ⁇ 4 and ⁇ 3 (not shown) having mutually different signs (see FIG. 3). Thereby, a cross-ply structure is formed, and there is an advantage that the strength of the belt layer 14 is improved.
- the pneumatic tire 1 includes a buffer rubber 146 that is disposed between the outermost belt ply 144 and the adjacent belt ply 143 and adjusts the inter-cord distance Ga (see FIGS. 2 to 4).
- a buffer rubber 146 that is disposed between the outermost belt ply 144 and the adjacent belt ply 143 and adjusts the inter-cord distance Ga (see FIGS. 2 to 4).
- the modulus Md when the buffer rubber 146 is stretched 100% has a relationship of Md ⁇ Mb with respect to the modulus Mb when the coat rubber 1442 of the outermost layer belt ply 144 is stretched 100%.
- the gauge Ga ′ of the buffer rubber 146 is 0. 0 with respect to the maximum values ⁇ max of the outer diameters ⁇ 4 and ⁇ 3 of the belt cords 1441 and 1431 in the outermost layer belt ply 144 and the adjacent belt ply 143. 45 ⁇ Ga ′ / ⁇ max ⁇ 1.00.
- the difference in absolute value between the belt angle ⁇ 4 of the outermost layer belt ply 144 and the belt angle ⁇ 3 of the adjacent belt ply 143 is 3 [deg] or more. Accordingly, there is an advantage that the mutual relationship between the belt angle ⁇ 4 of the outermost layer belt ply 144 and the belt angle ⁇ 3 of the adjacent belt ply 143 is optimized.
- of the belt angles ⁇ of all the belt plies 141 to 144 is in the range of 16 [deg] ⁇
- the pneumatic tire 1 includes a protective layer 147 disposed on the outer side in the tire radial direction of the outermost layer belt ply 144 (see FIG. 5). Thereby, there exists an advantage by which the belt layer 14 is protected.
- the pneumatic tire 1 is preferably a radial tire for construction vehicles.
- Radial tires for construction vehicles are tires attached to construction vehicles that run on rough terrain such as civil engineering construction sites, and are attached to construction vehicles such as large dump trucks, tire rollers, scrapers, graders, cranes, and wheel loaders. .
- the present invention is not limited to this, and the pneumatic tire 1 may be applied to a heavy duty radial tire mounted on a truck, a bus, or the like (not shown).
- FIG. 7 is a chart showing the results of the performance test of the pneumatic tire according to the embodiment of the present invention.
- test tire having a tire size of 3300R51 E * 2 is assembled to a specified TRA rim, and the specified TRA pneumatic pressure and TRA standard load are applied to the test tire. Further, the test tire is mounted on all wheels of a dump truck having a maximum loading capacity of 150 [t], which is a test vehicle.
- index evaluation is performed with the conventional example as a reference (100). This evaluation is preferably as the numerical value is larger, and if it is 110 or more, it can be said that there is a sufficiently superior effect.
- the test tire of Example 1 has the structure shown in FIGS.
- the belt angle of the first belt 141 is 22 [deg]
- the belt angle of the second belt 142 is 24 [deg]
- the belt angle ⁇ 3 of the third belt 143 is 22 [deg]
- the fourth belt The belt angle ⁇ 4 of the belt 144 is 18 [deg].
- the belt plies 141 to 144 are laminated while the belt cord inclination directions (belt angle signs) are alternately reversed.
- the modulus Mb at the time of 100% extension of the coat rubber 1442 of the outermost layer belt ply 144 is 4.0 [MPa], and the breaking elongation E of the belt cord 1441 is 330 [%].
- test tires of Examples 2 to 5 are modifications of the test tire of Example 1.
- the belt layer 14 does not include the buffer rubber 146 in the structure shown in FIGS. For this reason, the ratio Ga / ⁇ max is small.
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Abstract
Description
図1は、この発明の実施の形態にかかる空気入りタイヤを示すタイヤ子午線方向の断面図である。同図は、タイヤ径方向の断面図の片側領域を示している。また、同図は、空気入りタイヤの一例として、ORタイヤ(Off the Road Tire)と呼ばれる建設車両用ラジアルタイヤを示している。
図2および図3は、図1に記載した空気入りタイヤのベルト層を示す説明図である。これらの図において、図2は、ベルト層14の端部領域の拡大図を示している。また、図3は、ベルト層14の積層構造を示している。なお、図3では、各ベルトプライ141~144に記載されたハッチングが、ベルトコードの配置構成を模式的に示している。
図4は、図1に記載した空気入りタイヤのベルト層を示す説明図である。同図は、各ベルトプライ141~144を構成するベルトコードおよびコートゴムの配置構造を模式的に示している。
この空気入りタイヤ1では、図2~図4に示すように、ベルト層14が、緩衝ゴム146を備える。この緩衝ゴム146は、最外層ベルトプライ144と隣接ベルトプライ143との間に配置されてコード間距離Gaを調整する部材である。
図5および図6は、図1に記載した空気入りタイヤの変形例を示す説明図である。これらの図において、図5は、ベルト層14の端部領域の拡大図を示している。また、図6は、各ベルトプライ141~144を構成するベルトコードおよびコートゴムの配置構造を模式的に示している。
以上説明したように、この空気入りタイヤ1は、一対のビードコア11、11と、一対のビードコア11、11間に架け渡されるカーカス層13と、スチール製のベルトコードをコートゴムで被覆して成る少なくとも4枚のベルトプライ141~144を積層して構成されると共にカーカス層13のタイヤ径方向外側に配置されるベルト層14とを備える(図1~図3参照)。また、最外層ベルトプライ(4番ベルト144)と隣接ベルトプライ(3番ベルト143)との間のコード間距離Gaが、最外層ベルトプライ144および隣接ベルトプライ143におけるベルトコード1431、1441の外径φ3、φ4の最大値φmaxに対して、0.80≦Ga/φmax≦1.80の関係を有する(図4参照)。
この空気入りタイヤ1は、建設車両用ラジアルタイヤを適用対象とすることが好ましい。建設車両用ラジアルタイヤは、土木建設現場などの不整地を走行する建設車両に装着されるタイヤであり、大型ダンプ車、タイヤローラ、スクレーパ、グレーダ、クレーン、ホイールローダ等の建設車両に装着される。
Claims (14)
- 一対のビードコアと、前記一対のビードコア間に架け渡されるカーカス層と、スチール製のベルトコードをコートゴムで被覆して成る少なくとも4枚のベルトプライを積層して構成されると共に前記カーカス層のタイヤ径方向外側に配置されるベルト層とを備える空気入りタイヤであって、
タイヤ径方向の最も外側に配置される前記ベルトプライを最外層ベルトプライと呼ぶと共に、前記最外層ベルトプライに対してタイヤ径方向内側に配置されて隣り合う前記ベルトプライを隣接ベルトプライと呼ぶときに、
前記最外層ベルトプライと前記隣接ベルトプライとの間のコード間距離Gaが、前記最外層ベルトプライおよび前記隣接ベルトプライにおける前記ベルトコードの外径の最大値φmaxに対して、0.80≦Ga/φmax≦1.80の関係を有することを特徴とする空気入りタイヤ。 - 前記ベルトコードの外径の最大値φmaxが、1.50[mm]≦φmax≦6.00[mm]の範囲にある請求項1に記載の空気入りタイヤ。
- 前記最外層ベルトプライの前記コートゴムの100%伸張時のモジュラスMbが、3.0[MPa]≦Mb≦4.5[MPa]の範囲にある請求項1または2に記載の空気入りタイヤ。
- 前記最外層ベルトプライのベルトコードの破断伸びEが、270[%]≦E≦410[%]の範囲にある請求項1~3のいずれか一つに記載の空気入りタイヤ。
- すべての前記ベルトプライのベルト角度のうち前記最外層ベルトプライのベルト角度が、単独で最も小さい請求項1~4のいずれか一つに記載の空気入りタイヤ。
- 前記最外層ベルトプライのベルト角度が、絶対値で16[deg]以上20[deg]以下の範囲にある請求項5に記載の空気入りタイヤ。
- 前記最外層ベルトプライと前記隣接ベルトプライとが、相互に異符号のベルト角度を有する請求項1~6のいずれか一つに記載の空気入りタイヤ。
- 前記最外層ベルトプライと前記隣接ベルトプライとの間に配置されてコード間距離Gaを調整する緩衝ゴムを備える請求項1~7のいずれか一つに記載の空気入りタイヤ。
- 前記緩衝ゴムの100%伸張時のモジュラスMdが、前記最外層ベルトプライの前記コートゴムの100%伸張時のモジュラスMbに対してMd<Mbの関係を有する請求項8に記載の空気入りタイヤ。
- 前記緩衝ゴムのゲージGa’が、前記最外層ベルトプライおよび前記隣接ベルトプライにおける前記ベルトコードの外径の最大値φmaxに対して、0.45≦Ga’/φmax≦1.00の関係を有する請求項8または9に記載の空気入りタイヤ。
- 前記最外層ベルトプライのベルト角度と前記隣接ベルトプライのベルト角度との絶対値の差が、3[deg]以上である請求項1~10のいずれか一つに記載の空気入りタイヤ。
- 前記最外層ベルトプライのタイヤ径方向外側に配置される保護層を備える請求項1~11のいずれか一つに記載の空気入りタイヤ。
- すべての前記ベルトプライのベルト角度αの絶対値が、16[deg]≦|α|≦28[deg]の範囲にある請求項1~12のいずれか一つに記載の空気入りタイヤ。
- 建設車両用ラジアルタイヤを適用対象とする請求項1~13のいずれか一つに記載の空気入りタイヤ。
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AU2014282221A AU2014282221B2 (en) | 2013-06-21 | 2014-06-17 | Pneumatic tire |
RU2016101389A RU2644494C2 (ru) | 2013-06-21 | 2014-06-17 | Пневматическая шина |
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WO2016184753A1 (fr) * | 2015-05-18 | 2016-11-24 | Compagnie Generale Des Etablissements Michelin | Pneumatique comportant des couches de travail constituees de fils unitaires |
WO2016184757A1 (fr) * | 2015-05-18 | 2016-11-24 | Compagnie Generale Des Etablissements Michelin | Pneumatique comportant des couches de travail constituees de fils unitaires |
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