WO2026009644A1 - Composite câblé metallique-caoutchouc et pneumatique - Google Patents

Composite câblé metallique-caoutchouc et pneumatique

Info

Publication number
WO2026009644A1
WO2026009644A1 PCT/JP2025/020749 JP2025020749W WO2026009644A1 WO 2026009644 A1 WO2026009644 A1 WO 2026009644A1 JP 2025020749 W JP2025020749 W JP 2025020749W WO 2026009644 A1 WO2026009644 A1 WO 2026009644A1
Authority
WO
WIPO (PCT)
Prior art keywords
cord
rubber
steel
rubber composite
thickness
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2025/020749
Other languages
English (en)
Japanese (ja)
Inventor
直昭 宮部
徹也 中島
映史 松岡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Publication of WO2026009644A1 publication Critical patent/WO2026009644A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—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
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core

Definitions

  • Patent Document 1 discloses a steel cord-rubber composite comprising a steel cord and a rubber coating covering the steel cord, characterized in that the rubber coating is made from a specified rubber composition for steel cord coating.
  • the cord-rubber composite of the present disclosure is a cord-rubber composite comprising multiple steel cords and rubber in which the multiple steel cords, arranged in parallel, are embedded; the steel cords have a single-twist structure; when the wire diameter of the wires contained in the steel cords is d, the strength of the wires is 4350-2000 x dMPa or greater; in a cross section of the cord-rubber composite perpendicular to the longitudinal direction of the steel cords, the ratio of the inter-cord distance, which is the distance between adjacent steel cords, to the rubber thickness, which is the thickness of the rubber arranged on the steel cords, is 1.8 or greater; and the rubber thickness is 0.175 mm or greater and 0.225 mm or less.
  • FIG. 1 is a cross-sectional view of a cord-rubber composite according to one embodiment of the present disclosure.
  • FIG. 2 is a perspective view of a steel cord having a 1 ⁇ 4 structure.
  • FIG. 3 is a cross-sectional view of a tire according to one aspect of the present disclosure.
  • FIG. 4 is an explanatory diagram of the relationship between the cord distance/rubber thickness and the member weight in the experimental example.
  • FIG. 5 is an explanatory diagram of the relationship between the cord distance/rubber thickness and adhesive strength in the experimental example.
  • the objective of this disclosure is to provide a cord-rubber composite with high component strength and reduced component weight.
  • This disclosure makes it possible to provide a cord-rubber composite with high component strength and reduced component weight.
  • a cord-rubber composite is a cord-rubber composite comprising a plurality of steel cords and rubber in which the steel cords, arranged in parallel, are embedded, the steel cords having a single-twist structure, and where the wire diameter of the wires contained in the steel cords is d (unit: mm), the strength of the wires is 4350-2000 x dMPa or greater, and in a cross section of the cord-rubber composite perpendicular to the longitudinal direction of the steel cords, the ratio of the inter-cord distance, which is the distance between adjacent steel cords, to the rubber thickness, which is the thickness of the rubber arranged on the steel cords, is 1.8 or greater, and the rubber thickness is 0.175 mm or greater and 0.225 mm or less.
  • the strength of the steel cord's wires 4350-2000 x dMPa By making the strength of the steel cord's wires 4350-2000 x dMPa or more, the strength of the steel cord is increased, thereby increasing the strength of the cord-rubber composite without excessively increasing the number of steel cords in the cord-rubber composite.
  • the ratio of the cord spacing to the rubber thickness is 1.8 or more, the adhesive strength between the steel cord and rubber is increased, improving the durability of the cord-rubber composite and tires containing the cord-rubber composite.
  • the rubber surrounding the steel cord can be made sufficiently thick, thereby particularly enhancing the adhesive strength between the steel cord and the rubber.
  • the rubber thickness 0.225 mm or less the thickness of the cord-rubber composite can be made thinner, thereby reducing the weight of the cord-rubber composite components.
  • the ratio of the distance between the cords to the rubber thickness may be 2.2 or greater.
  • the adhesive strength, particularly between the steel cord and rubber is increased, improving the durability of the cord-rubber composite and tires that include the cord-rubber composite.
  • the steel cord may have a 1xn structure, where n is 3 or more and 5 or less.
  • n 3 or greater
  • the strength of the steel cord can be particularly increased.
  • n 5 or less
  • the cord diameter of the steel cord can be reduced. This allows for a thinner component thickness, i.e., the thickness of the cord-rubber composite, which is selected so that the steel cord can be embedded, and also reduces the weight of the cord-rubber composite component.
  • the inter-cord distance may be 80% or more and 150% or less of the cord diameter of the steel cord.
  • the distance between the cords at least 80% of the cord diameter, the distance between the cords can be made sufficiently long, allowing for a sufficient amount of rubber to be placed between the steel cords. This particularly enhances the adhesive strength between the steel cords and the rubber.
  • the distance between steel cords in the cord-rubber composite can be prevented from becoming excessively large, thereby improving the punching resistance of the cord-rubber composite.
  • the wire diameter may be 0.15 mm or more and 0.30 mm or less.
  • the cord diameter of the steel cord can be made particularly small.
  • the thickness of the cord-rubber composite is selected so that the steel cord contained therein can be embedded. Therefore, by reducing the cord diameter of the steel cord, the thickness of the cord-rubber composite member using the steel cord can also be reduced, allowing for weight reduction of the cord-rubber composite and tires containing the cord-rubber composite.
  • the strength of the steel cord can be increased, and the number of steel cords required to achieve the desired component strength for the cord-rubber composite can be reduced. This allows for weight reduction in the cord-rubber composite and in tires that include the cord-rubber composite.
  • a tire according to one embodiment of the present disclosure includes the cord-rubber composite described in any one of (1) to (5).
  • the component strength of the belt layer is high, allowing for reduced component weight. Therefore, in a tire according to one aspect of the present disclosure, the tire's rigidity can be increased and rolling resistance can be reduced. In other words, a tire according to one aspect of the present disclosure can be a tire with excellent running stability, low fuel consumption, and excellent durability.
  • Figure 1 is a cross-sectional view of the cord-rubber composite of this embodiment. Note that Figure 1 is a cross-section perpendicular to the longitudinal direction of the steel cord of the cord-rubber composite 10.
  • Figure 2 is a perspective view of a 1x4 steel cord with a single twist structure.
  • the Y axis in Figures 1 and 2 is the axis along the longitudinal direction of the steel cord 11. Furthermore, the XZ plane in Figures 1 and 2 is the plane perpendicular to the longitudinal direction of the steel cord 11.
  • FIG. 1 is a cross-sectional view of the cord-rubber composite 10 of this embodiment, in which cord-rubber composite 10A and cord-rubber composite 10B are laminated together.
  • cord-rubber composite 10A and cord-rubber composite 10B have the same configuration, so unless a distinction is required, they will simply be referred to as cord-rubber composite 10.
  • the following explanation will mainly focus on the cord-rubber composite 10A.
  • the cord-rubber composite 10 of this embodiment has a plurality of steel cords 11 and rubber 12 in which the plurality of steel cords 11 are embedded.
  • the steel cords 11 contained in the cord-rubber composite 10 can be arranged parallel to one another with the longitudinal direction of each steel cord 11 aligned along the Y axis in Figure 1.
  • the plurality of steel cords 11 are embedded in the rubber 12 in a parallel aligned state.
  • the plurality of steel cords 11 can be arranged along the width of the cord-rubber composite 10 (along the X axis in Figure 1).
  • (1) Steel cord (1-1) Structure As shown in Figures 1 and 2, the steel cord 11 can be a stranded wire formed by twisting together a plurality of wires 111. Specifically, as shown in Figure 2, the steel cord 11 can be formed by twisting together the wires 111 in a spiral shape along the longitudinal direction of the steel cord 11.
  • the steel cord 11 can have a single twist structure.
  • a single-twist structure refers to a structure in which multiple wires 111 are twisted together to form a single layer (one layer).
  • a single layer refers to a structure in which, in a cross section perpendicular to the longitudinal direction of the steel cord 11, the wires 111 are arranged in a single row along the circumference of a circle.
  • a steel cord 11 with a single twist structure can be expressed as a 1xn structure, where "n” refers to the number of wires contained in the steel cord 11, and “1" refers to the number of layers formed by multiple wires, as mentioned above.
  • Figures 1 and 2 show an example of a steel cord 11 with a 1x4 structure having four wires, but the number of wires contained in the steel cord 11 is not particularly limited and can be selected as desired.
  • the steel cord 11 used in the cord-rubber composite 10 of this embodiment may have a 1 ⁇ n structure, where n is 3 or more and 5 or less.
  • n is 3 or more and 5 or less.
  • the strength of the steel cord can be particularly increased.
  • the cord diameter (outer diameter) of the steel cord 11 can be reduced. Therefore, the member thickness T10, which is the thickness of the cord-rubber composite 10 in which the steel cord 11 can be embedded, can also be reduced, and the member weight of the cord-rubber composite 10 can also be reduced.
  • the wire diameter d of the wires 111 included in the steel cord 11 of the present embodiment is not particularly limited, but may be, for example, less than 2.175 mm, 0.50 mm or less, or 0.30 mm or less.
  • the wire diameter d of the wire 111 may be 0.12 mm or more, or 0.15 mm or more.
  • the wire diameter d of the wire 111 may be 0.12 mm or more and less than 2.175 mm, 0.12 mm or more and 0.50 mm or less, or 0.15 mm or more and 0.30 mm or less.
  • the cord diameter D11 of the steel cord 11 can be reduced.
  • the cord diameter D11 of the steel cord 11 can be further reduced.
  • the cord diameter D11 of the steel cord 11 can be made especially small.
  • the thickness of the cord-rubber composite is selected so that the steel cord 11 contained therein can be embedded. Therefore, by reducing the cord diameter D11 of the steel cord 11, the thickness of the cord-rubber composite member using the steel cord 11 can also be reduced, allowing for weight reduction of the cord-rubber composite and tires including the cord-rubber composite.
  • the wires 111 of the steel cord 11 of this embodiment may be made of wire material only, or may have a brass plating film on the surface of the wire material.
  • the wire may be, for example, steel wire or high-carbon steel wire.
  • the brass plating film contains copper (Cu) and zinc (Zn).
  • the brass plating film can be arranged to cover the side (outer surface) of the wire.
  • the copper contained in the brass plating film reacts with the sulfur (S) contained in the rubber, producing an adhesive layer containing the reaction product copper sulfide (Cu 2 S) in the rubber near the interface between the wire and the rubber.
  • the resulting adhesive layer can improve the initial adhesive performance between the steel cord and rubber.
  • Initial adhesive performance refers to the adhesive performance between the steel cord and rubber immediately after vulcanization during the manufacture of a cord-rubber composite or a tire containing the cord-rubber composite.
  • the zinc contained in the brass plating film is thought to promote and control the reaction that forms the adhesive layer.
  • the brass plating film may also contain elements other than copper and zinc.
  • the brass plating film may also contain one or more elements selected from the group consisting of cobalt (Co), nickel (Ni), tin (Sn), iron (Fe), and manganese (Mn).
  • the additive elements cobalt, nickel, tin, iron, and manganese have a greater tendency to ionize than copper. Therefore, when the brass plating film contains additive elements in addition to copper and zinc, the brass plating film functions as a sacrificial corrosion protector, or the combined potential of copper and zinc can be made more noble. Therefore, when the brass plating film contains additive elements, the corrosion resistance of the steel cord 11 can be improved.
  • the wires 111 of the steel cord 11 may be corrugated wires having bent portions and non-bent portions alternately along the length. (Strength of wire)
  • the inventors of the present disclosure have conducted research into cord-rubber composites that have high component strength and reduced component weight.
  • a cord-rubber composite with high component strength and reduced component weight refers to a cord-rubber composite with component strength equal to or greater than that of the cord-rubber composite of Experimental Example 15 (see Table 2), but with a component weight lighter than that of the cord-rubber composite of Experimental Example 15.
  • the cord-rubber composite shown in Experimental Example 15 uses a steel cord made by twisting together commonly used wires with a wire strength of 3110 MPa to form a 1x4 structure, and embeds a number of steel cords in the rubber that will sufficiently increase the component strength of the cord-rubber composite.
  • the strength of the wires 111 can be 4350-2000 x dMPa or more.
  • the strength of the wires 111 of the steel cord 11 By setting the strength of the wires 111 of the steel cord 11 to 4350-2000 ⁇ dMPa or more, it is possible to ensure sufficient strength for the wires 111 according to the wire diameter, thereby increasing the strength of the steel cord 11. As a result, the strength of the cord-rubber composite 10 can be increased without excessively increasing the number of steel cords 11 in the cord-rubber composite 10.
  • the unit of "4350" in the above formula is "MPa”
  • the unit of "2000” is “MPa/mm”
  • the unit of "d” is "mm".
  • the -2000 x d in the formula 4350 - 2000 x d for the strength of the wires 111 of the steel cord 11 is a correction term used to cancel out the dependency of strength on the wire diameter.
  • the value of the correction term is -500, and the strength can be 3850 MPa or more.
  • the strength of the wires 111 of the steel cord 11 may be, for example, 5350-2000 x dMPa or less.
  • the strength of the wire 111 can be set within a predetermined range by, for example, selecting the material of the wire.
  • the strength of the wire 111 can be set within a predetermined range by selecting the amount of carbon contained in the steel used for the wire.
  • Rubber The rubber 12 of the cord-rubber composite 10 can be produced by molding a rubber composition and vulcanizing it as necessary.
  • the specific composition of the rubber is not particularly limited and can be selected depending on the intended use of the tire or other product to which the cord-rubber composite 10 is applied, as well as the required properties.
  • the rubber may contain, for example, a rubber component, sulfur, and a vulcanization accelerator.
  • the rubber component may contain at least one type selected from, for example, natural rubber (NR) and isoprene rubber (IR) in an amount of 60% by mass or more, 70% by mass or more, or even 100% by mass.
  • NR natural rubber
  • IR isoprene rubber
  • the breaking strength of the cord-rubber composite 10 and the tire can be increased.
  • Rubber components used in combination with natural rubber or isoprene rubber include, for example, one or more selected from styrene-butadiene rubber (SBR), butadiene rubber (BR), ethylene-propylene-diene rubber (EPDM), chloroprene rubber (CR), butyl rubber (IIR), and acrylonitrile-butadiene rubber (NBR).
  • SBR styrene-butadiene rubber
  • BR butadiene rubber
  • EPDM ethylene-propylene-diene rubber
  • CR chloroprene rubber
  • IIR butyl rubber
  • NBR acrylonitrile-butadiene rubber
  • sulfur used as a vulcanizing agent in the rubber industry can be used.
  • the sulfur content of the rubber is not particularly limited, but may be, for example, 5 to 8 parts by mass per 100 parts by mass of the rubber component.
  • the ratio of sulfur By setting the ratio of sulfur to 5 parts by mass or more per 100 parts by mass of the rubber component, the crosslink density of the resulting rubber can be increased, and the adhesive strength between the steel cord and the rubber can be particularly improved. Furthermore, by setting the ratio of sulfur to 8 parts by mass or less per 100 parts by mass of the rubber component, the sulfur can be dispersed particularly uniformly within the rubber, and blooming can be prevented.
  • the vulcanization accelerator is not particularly limited, but examples include sulfenamide accelerators such as N,N'-dicyclohexyl-2-benzothiazolylsulfenamide, N-cyclohexyl-2-benzothiazolylsulfenamide, N-tert-butyl-2-benzothiazolylsulfenamide, and N-oxydiethylene-2-benzothiazolylsulfenamide.
  • sulfenamide accelerators such as N,N'-dicyclohexyl-2-benzothiazolylsulfenamide, N-cyclohexyl-2-benzothiazolylsulfenamide, N-tert-butyl-2-benzothiazolylsulfenamide, and N-oxydiethylene-2-benzothiazolylsulfenamide.
  • thiazole accelerators such as 2-mercaptobenzothiazole and di-2-benzothiazolyl disulfide
  • thiuram accelerators such as tetrabenzylthiuram disulfide, tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetrakis(2-ethylhexyl)thiuram disulfide, and tetramethylthiuram monosulfide may also be used.
  • the rubber composition used in the cord-rubber composite 10 of this embodiment can be produced by kneading raw materials such as rubber components, heating them, and extruding them.
  • the rubber of the cord-rubber composite 10 of this embodiment may also contain a cobalt component, which is one or more types selected from cobalt alone and compounds containing cobalt.
  • cobalt-containing compounds examples include organic cobalt salts and inorganic cobalt salts.
  • the organic cobalt salt may be, for example, one or more selected from the group consisting of cobalt naphthenate, cobalt stearate, cobalt neodecanoate, cobalt rosinate, cobalt versatate, and cobalt tall oil salt.
  • the organic cobalt salt may also be a composite salt in which part of the organic acid is replaced with boric acid.
  • the inorganic cobalt acid may be, for example, one or more selected from cobalt chloride, cobalt sulfate, cobalt nitrate, cobalt phosphate, and cobalt chromate.
  • the rubber may also contain any optional components other than the above rubber components, sulfur, vulcanization accelerator, cobalt, etc.
  • the rubber may also contain well-known rubber additives such as reinforcing agents (carbon black, silica, etc.), wax, and antioxidants.
  • the ratio of the cord-to-cord distance L11 to the rubber thickness T12 (L11/T12) in the cord-rubber composite 10 of this embodiment can be set to 1.8 or greater.
  • the ratio of the cord-to-cord distance L11 to the rubber thickness T12 is 1.8 or greater, the adhesive strength between the steel cord 11 and the rubber 12 is increased, thereby improving the durability of the cord-rubber composite 10 and tires that include the cord-rubber composite 10.
  • the ratio of the cord distance L11 to the rubber thickness T12 may be 2.2 or greater.
  • the adhesive strength between the steel cords 11 and the rubber 12 in particular can be increased, and the durability of the cord-rubber composite 10 and a tire including the cord-rubber composite 10 can be improved.
  • the rubber thickness T12 of the cord-rubber composite body 10 of this embodiment can be set to 0.175 mm or more and 0.225 mm or less.
  • the rubber thickness 0.175 mm or more the rubber 12 surrounding the steel cord 11 can be made sufficiently thick, particularly enhancing the adhesive strength between the steel cord 11 and the rubber 12.
  • the member thickness T10 of the cord-rubber composite 10 can be made thin, and the member weight of the cord-rubber composite 10 can be reduced.
  • the inter-cord distance L11 may be, for example, 80% or more and 150% or less of the cord diameter D11 of the steel cord 11.
  • the inter-cord distance L11 can be made sufficiently long, allowing for a sufficient amount of rubber 12 to be placed between the steel cords 11. This particularly enhances the adhesive strength between the steel cords 11 and the rubber 12.
  • the distance between the steel cords 11 in the cord-rubber composite 10 can be prevented from becoming excessively large, thereby improving the punching resistance of the cord-rubber composite 10.
  • the punching resistance of the cord-rubber composite 10A refers to the ability to prevent the formation of a hole penetrating the cord-rubber composite 10A when a foreign object comes into contact with the upper surface 100 of the cord-rubber composite 10A and presses against it.
  • the cord-rubber composite 10 is often made up of multiple cord-rubber composites 10, namely, cord-rubber composite 10A and cord-rubber composite 10B, stacked together.
  • cord-rubber composite 10A and cord-rubber composite 10B When multiple cord-rubber composites 10 are stacked in this way, it may not be possible to see the boundary line 13 between the cord-rubber composite 10A and the cord-rubber composite 10B, which is the top surface 100 of the cord-rubber composite 10A.
  • the rubber thickness T12 can be measured by first measuring the thickness T11, which is the minimum thickness of the rubber 12 between the steel cords 11 arranged along the thickness of the layered cord-rubber composites 10. Then, half the value of the thickness T11 may be used as the rubber thickness T12 of the measured steel cord 11.
  • the tire of this embodiment may include a cord-rubber composite 10 according to one aspect of the present disclosure.
  • Figure 3 shows a cross-sectional view of a tire 30 according to this embodiment, taken along a plane perpendicular to the outer periphery. While Figure 3 only shows the portion to the left of the center line (CL), the same structure continues to the right of the CL, with the CL as the axis of symmetry.
  • the tire 30 has a tread portion 31, a sidewall portion 32, and a bead portion 33.
  • the tread portion 31 is the portion that comes into contact with the road surface.
  • the bead portions 33 are located closer to the inner diameter of the tire 30 than the tread portion 31.
  • the bead portions 33 are the portions that come into contact with the rim of a vehicle wheel.
  • the sidewall portions 32 connect the tread portion 31 and the bead portions 33. When the tread portion 31 receives an impact from the road surface, the sidewall portions 32 elastically deform and absorb the impact.
  • the tire 30 includes an inner liner 34, a carcass 35, a belt layer 36, and a bead wire 37.
  • the inner liner 34 contains rubber and seals the space between the tire 30 and the wheel.
  • the belt layer 36 tightens the carcass 35, increasing the rigidity of the tread portion 31.
  • the tire 30 has two belt layers 36.
  • the cord-rubber composite 10 according to one embodiment of the present disclosure can be used as the belt layer 36.
  • the cord-rubber composite 10 has already been described, so a detailed description will be omitted.
  • one cross section perpendicular to the longitudinal direction of one reference steel cord (hereinafter referred to as the "reference steel cord”) included in the cord-rubber composite was exposed.
  • the same cross section as cord-rubber composite 10A shown in Figure 1 was exposed.
  • two more cross sections 100 mm apart along the longitudinal direction of the reference steel cord were exposed.
  • steel cord 11A is considered the reference steel cord.
  • the formula 4350-2000 ⁇ d is calculated from the wire diameter d, and the calculated value is shown in the column "4350-2000 ⁇ d".
  • (Cord diameter) In one cross section, the diameters of the smallest inclusive circles were measured for steel cords 11A to 11E, which were the five steel cords 11 to be evaluated, and the average value was calculated.
  • the smallest inclusive circles of steel cords 11A to 11E are smallest inclusive circle C11A, smallest inclusive circle C11B, smallest inclusive circle C11C, smallest inclusive circle C11D, and smallest inclusive circle C11E, respectively.
  • the calculated average value was taken as the cord diameter of the steel cord 11 in the cross section where the measurements were made.
  • the cord diameters of the steel cords 11 were measured in the remaining two cross sections using the same procedure, and the average value of the cord diameters in the three cross sections was taken as the cord diameter D11 of the steel cord 11 included in the cord-rubber composite 10A. (distance between cords) In one cross section, the inter-cord distances L11A, L11B, L11C, and L11D between adjacent steel cords 11 were measured for steel cords 11A to 11E, and average values were calculated. The calculated average values were used as the inter-cord distances in the measured cross section.
  • the rubber thicknesses were calculated in the remaining two cross sections using the same procedure, and the average value of the rubber thicknesses in the three cross sections was used as the rubber thickness T12 in the cord-rubber composite 10A.
  • the thickness of the cord-rubber composite 10A was measured at one location in one cross section.
  • the thickness of the cord-rubber composite was measured at the remaining two cross sections using the same procedure, and the average value of the thicknesses of the cord-rubber composite at the three cross sections was defined as the member thickness T10 of the cord-rubber composite 10A.
  • the adhesive strength was normalized using the evaluation result for the adhesive strength evaluation specimen in Experimental Example 15 as the standard, i.e., 100, and the adhesive strength measured in each experiment was used as the index value.
  • the component weight was standardized using the evaluation result for the cord-rubber composite in Experimental Example 15 as the standard, i.e., 100, and the weight measured in each experiment was used as the index value.
  • the rubber was manufactured using a rubber composition containing a rubber component and additives.
  • the rubber composition contains 100 parts by mass of natural rubber as the rubber component.
  • the rubber composition also contains the following additives per 100 parts by mass of the rubber component: 60 parts by mass of carbon black, 7 parts by mass of sulfur, 0.5 parts by mass of a vulcanization accelerator, 8 parts by mass of zinc oxide, and 2 parts by mass of cobalt stearate as an organic cobalt acid.
  • the evaluation results are shown in Table 1.
  • the relationship between the cord distance/rubber thickness and the weight of the member is shown in FIG. 4, and the relationship between the cord distance/rubber thickness and the adhesive strength is shown in FIG.
  • Steel cords 11 were prepared by twisting together wires having the wire strength and wire diameter d shown in Table 1 to form a 1 ⁇ n structure, which is a single twist structure, shown in Table 1.
  • the cord-rubber composite and test specimen for adhesive strength evaluation were manufactured so that the inter-cord distance and rubber thickness were predetermined values. Except for the above points, the cord-rubber composite and test specimen for adhesive strength evaluation were manufactured and evaluated using the same procedures as in Experimental Example 1.
  • the evaluation results are shown in Table 1.
  • the relationship between the cord distance/rubber thickness and the weight of the member is shown in FIG. 4, and the relationship between the cord distance/rubber thickness and the adhesive strength is shown in FIG.
  • Steel cords 11 were prepared by twisting together wires having the wire strength and wire diameter d shown in Table 2 to form a 1 ⁇ n structure, which is a single twist structure, shown in Table 2.
  • the cord-rubber composite and the test specimen for adhesive strength evaluation were manufactured so that the inter-cord distance and rubber thickness were predetermined values. Except for the above points, the cord-rubber composite and the test specimen for adhesive strength evaluation were manufactured and evaluated using the same procedures as in Experimental Example 1.
  • cord-rubber composites of Experimental Examples 1 to 14 had component weight values of less than 100, confirming that the component weight had been reduced. Furthermore, the cord-rubber composites of Experimental Examples 1 to 14 also had component strengths of 100 or more, indicating that these cord-rubber composites have high component strength.
  • Figure 4 which shows the relationship between inter-cord distance/rubber thickness and component weight, confirms that the results of Experimental Examples 1 to 14 and Experimental Examples 16 to 20 show a tendency for component weight to decrease as inter-cord distance/rubber thickness increases.
  • approximation line 40 which was drawn to show the distribution trend of each measurement point shown in Figure 4, it was confirmed that there was a change in the tendency for component weight to decrease before and after dotted line A, where inter-cord distance/rubber thickness is 1.8, and dotted line B, where inter-cord distance/rubber thickness is 2.2.
  • Figure 5 which shows the relationship between inter-cord distance/rubber thickness and adhesive strength, confirms a tendency for adhesive strength to increase as inter-cord distance/rubber thickness increases in the results of Experimental Examples 1 to 14 and Experimental Examples 16 to 20. Because the rubber thickness is roughly the same in Experimental Examples 1 to 18, this means that the inter-cord distance/rubber thickness increases as the inter-cord distance increases. For this reason, it is thought that the amount of rubber placed between the steel cords increases as the inter-cord distance/rubber thickness increases, resulting in an increase in adhesive strength.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ropes Or Cables (AREA)
  • Tires In General (AREA)

Abstract

Ce composite câblé métallique-caoutchouc comprend : une pluralité de câbles d'acier, et du caoutchouc dans lequel la pluralité de câbles d'acier alignés en parallèle sont incorporés. Chaque câble en acier présente une seule structure torsadée. Lorsque le diamètre d'un fil d'élément inclus dans chacun des câbles d'acier est d (unité : mm), la résistance du fil d'élément est supérieure ou égale à 4350-2000 × dMPa. Dans une section transversale du composite câblé métallique-caoutchouc, la section transversale étant considérée perpendiculairement à la direction longitudinale des câbles d'acier, le rapport d'une distance entre câbles, qui est la distance entre des câbles d'acier adjacents, à une épaisseur de caoutchouc, qui est l'épaisseur du caoutchouc disposé sur les câbles d'acier, est de 1,8 ou plus, et l'épaisseur de caoutchouc est comprise entre 0,175 mm et 0,225 mm.
PCT/JP2025/020749 2024-07-04 2025-06-09 Composite câblé metallique-caoutchouc et pneumatique Pending WO2026009644A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10264608A (ja) * 1997-03-27 1998-10-06 Yokohama Rubber Co Ltd:The 空気入りラジアルタイヤ
WO2018142691A1 (fr) * 2017-02-01 2018-08-09 栃木住友電工株式会社 Pneu
JP2018178332A (ja) * 2017-04-20 2018-11-15 栃木住友電工株式会社 スチールコード、タイヤ
JP2020062968A (ja) * 2018-10-17 2020-04-23 株式会社ブリヂストン タイヤ
JP7367899B1 (ja) * 2023-02-24 2023-10-24 住友電気工業株式会社 スチールコード、コード－ゴム複合体、タイヤ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10264608A (ja) * 1997-03-27 1998-10-06 Yokohama Rubber Co Ltd:The 空気入りラジアルタイヤ
WO2018142691A1 (fr) * 2017-02-01 2018-08-09 栃木住友電工株式会社 Pneu
JP2018178332A (ja) * 2017-04-20 2018-11-15 栃木住友電工株式会社 スチールコード、タイヤ
JP2020062968A (ja) * 2018-10-17 2020-04-23 株式会社ブリヂストン タイヤ
JP7367899B1 (ja) * 2023-02-24 2023-10-24 住友電気工業株式会社 スチールコード、コード－ゴム複合体、タイヤ

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