WO2017073772A1 - Coil spring wire rod and coil spring - Google Patents

Coil spring wire rod and coil spring Download PDF

Info

Publication number
WO2017073772A1
WO2017073772A1 PCT/JP2016/082173 JP2016082173W WO2017073772A1 WO 2017073772 A1 WO2017073772 A1 WO 2017073772A1 JP 2016082173 W JP2016082173 W JP 2016082173W WO 2017073772 A1 WO2017073772 A1 WO 2017073772A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil spring
wire
core material
winding
core
Prior art date
Application number
PCT/JP2016/082173
Other languages
French (fr)
Japanese (ja)
Inventor
和彦 許斐
勝 今村
孝充 佐野
Original Assignee
日本発條株式会社
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 日本発條株式会社 filed Critical 日本発條株式会社
Publication of WO2017073772A1 publication Critical patent/WO2017073772A1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/04—Wound springs
    • F16F1/06—Wound springs with turns lying in cylindrical surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/366—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers made of fibre-reinforced plastics, i.e. characterised by their special construction from such materials

Definitions

  • the present invention relates to a coil spring wire and a coil spring using the coil spring wire.
  • Patent Document 1 discloses a flexible core wire, a reinforcing fiber layer wound so that the angle of the core wire with respect to the axial direction is 15 ° to 80 °, or ⁇ 80 ° to ⁇ 15 °, and a core wire.
  • a coil spring using a wire for an elastic member made of a thermosetting resin matrix that joins a reinforcing fiber layer is described.
  • the wire for elastic members disclosed in Patent Document 1 uses a solid metal for the core, the weight reduction rate is small.
  • Patent Document 2 discloses a wire for an elastic member in which fibers are wound around a core material at a predetermined angle with respect to the axial direction of the core material.
  • Patent Document 2 An example of the wire for elastic member disclosed in Patent Document 2 is described for a small coil spring.
  • a wire diameter and a coil size that can handle a large load resistance are large for use in a suspension spring for an automobile.
  • a coil spring is required, and the damage due to the diameter reduction of the wire rod caused by the torsional load that is applied when the coil spring is compressed is not considered, and depending on the core material, the diameter is reduced and the strength and rigidity are low. It did not have the characteristics that could be used.
  • This invention is made in view of the above, Comprising: It aims at providing the wire material for coil springs and coil spring which can improve intensity
  • a coil spring wire according to the present invention is a coil spring wire for producing a coil spring, and is a spiral formed using a long member. And a reinforcing fiber formed by winding the core material, and an FRP layer covering the outer surface of the core material.
  • the core material and the reinforcing fiber have a winding direction.
  • the coil spring wires are opposite to each other with respect to the central axis.
  • the reinforcing fiber is a load applied from the outside in a direction in which at least the reinforcing fiber on the outer surface is wound around the core material. It is a direction along the direction of the tensile load applied to the coil spring wire according to the load that applies torsional stress to the coil spring wire.
  • the coil spring wire according to the present invention is characterized in that, in the above-mentioned invention, the core material has a constant angle between a winding central axis and a winding direction.
  • the core is formed by spirally winding a band-shaped member, and an interval formed along the longitudinal direction is larger than a width of the band-shaped member. It is small.
  • the wire for a coil spring according to the present invention is characterized in that, in the above invention, the core is formed using a steel material, an alloy containing aluminum, magnesium or titanium as a main component, or FRP. And
  • the wire for a coil spring according to the present invention is the above-described invention, wherein the core formed using the long member has a rectangular shape, a circle, an ellipse formed by an outer periphery viewed from the longitudinal direction of the core material. It is characterized by having a shape or a polygonal shape.
  • the coil spring wire according to the present invention is characterized in that, in the above invention, the long member has a rectangular, circular, elliptical or polygonal cross section perpendicular to the longitudinal direction.
  • the wire material for a coil spring according to the present invention is characterized in that, in the above-mentioned invention, the wire material is mainly composed of a resin and is provided inside the core material.
  • the coil spring wire according to the present invention is characterized in that, in the above-described invention, an electrolytic corrosion prevention portion provided between the core material and the reinforcing fiber is provided.
  • the FRP layer includes a thermosetting resin that fixes the reinforcing fibers to each other, and the core material includes the thermosetting resin on an outer surface. The surface treatment which improves the adhesiveness of this is performed.
  • the wire for a coil spring according to the present invention is characterized in that, in the above invention, the reinforcing fibers are continuous along a circumferential direction with respect to the core material.
  • the coil spring according to the present invention is characterized in that the coil spring wire according to the present invention is wound.
  • the coil spring according to the present invention is a compression coil spring in the above invention.
  • the coil spring according to the present invention is a suspension spring for automobiles in the above invention.
  • the coil spring manufactured using the coil spring wire has the effect of improving the strength while reducing the weight.
  • FIG. 1 is a schematic diagram showing a configuration of a coil spring according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram illustrating a configuration of a main part of the coil spring according to the embodiment of the present invention.
  • FIG. 3 is a schematic diagram illustrating the configuration of the main part of the coil spring according to the embodiment of the present invention.
  • FIG. 4A is a schematic diagram illustrating a configuration of a main part of the coil spring according to the embodiment of the present invention.
  • FIG. 4B is a schematic diagram illustrating a configuration of a main part of the coil spring according to the embodiment of the present invention.
  • FIG. 5 is a schematic diagram showing a configuration of a coil spring wire according to an embodiment of the present invention.
  • FIG. 6 is a diagram for explaining a method of manufacturing a coil spring wire according to an embodiment of the present invention.
  • FIG. 7 is a diagram for explaining a method of manufacturing a coil spring wire according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram showing a configuration of a coil spring according to a modification of the embodiment of the present invention.
  • FIG. 9 is a schematic diagram for explaining the porosity according to the embodiment of the present invention.
  • FIG. 1 is a schematic diagram showing a configuration of a coil spring according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram showing a configuration of a main part of the coil spring according to the embodiment of the present invention.
  • FIG. 3 is a schematic diagram showing the configuration of the main part of the coil spring according to the embodiment of the present invention, and is a plan view seen from the central axis direction of the wire.
  • the coil spring 1 is manufactured by winding a wire formed by winding a fiber around a core material in a spiral shape.
  • the coil spring 1 is compressed in a predetermined direction (for example, a winding direction).
  • the coil spring 1 is used, for example, as a suspension spring for an automobile suspension.
  • the coil spring 1 includes a core material 10 formed using a metal, an alloy, or a fiber reinforced plastic (FRP), and a plurality of reinforcing fibers 12 wound around the core material 10, and covers the core material 10. It has an FRP layer 11 and has a spiral shape.
  • the coil spring 1 preferably has a strength of 10 GPa or more and a static torsional strength of 500 MPa or more as strength when used as a suspension spring.
  • the core material 10 is a spiral tube formed by winding a long belt-like member in a spiral shape.
  • the core material 10 is made of, for example, a lightweight alloy such as an alloy mainly composed of aluminum, magnesium, or titanium, or FRP. More specifically, examples of the aluminum alloy include 2000 series, 5000 series, 6000 series, and 7000 series aluminum alloys.
  • As the reinforcing fiber used for FRP at least one fiber selected from carbon fiber, glass fiber, aramid fiber which is an aromatic polyamide fiber, and basalt fiber which is a basalt fiber is used, and the strength as the core material 10 is increased. It is preferable that they are carbon fiber and glass fiber at the point to provide.
  • the spiral tube is lighter than the solid core, a heavy metal such as a steel material or a hard steel wire can be used.
  • the cross-section (cross-section perpendicular to the extending direction) of the band-shaped member constituting the core material 10 is described as being rectangular (rectangular).
  • the cross-shaped member is circular, elliptical, polygonal (square) May be included).
  • the long band-shaped member is described as a rectangular (rectangular) cross section orthogonal to the longitudinal direction.
  • the long band-shaped member has a circular shape, an elliptical shape, or a polygonal shape (including a square shape). It may be a member.
  • the shape of the core material 10 will be described later.
  • the core material 10 When the core material 10 is formed using a steel material or a light alloy such as a hard steel wire, an alloy mainly composed of aluminum, magnesium, or titanium, the core material 10 is from a direction orthogonal to the central axis N1.
  • the spiral tube is wound so that the winding angle is in the range of 20 ° to 85 ° upward with respect to the central axis N1, or in the range of ⁇ 85 ° to ⁇ 20 ° downward.
  • the core material 10 when the core material 10 is formed using FRP, the core material 10 has a spiral tube winding angle of 45 ° to 80 ° upward with respect to the central axis N1, or ⁇ 80 when downward.
  • the core material 10 is described as having a circular shape on the outer periphery when viewed from the direction of the central axis N1 of winding, the core material 10 may be rectangular, elliptical, or polygonal.
  • “upward” and “downward” refer to the direction in which the member extends by winding with respect to the central axis N1 extending in a predetermined direction, for example.
  • the central axis is actually spiral along the coil spring wire constituting the coil spring 1.
  • the core material 10 may be partially wound at an angle in the winding direction with respect to the central axis N1, but is preferably wound at a certain angle.
  • the “certain angle” here includes an error of a winding angle in manufacturing.
  • the core material 10 may be subjected to rust prevention treatment inside. Specifically, a rust prevention treatment is performed by applying a rust inhibitor on the inner side of the core material 10.
  • the outer periphery may have the coating layer which consists of resin which consists of insulating materials, or FRP.
  • the core material 10 may be provided with a resin core inside, may be filled with resin inside, or may be provided with a lid for closing the openings at both ends. Thereby, the penetration
  • Coil spring 1 forms the diameter of the circumference of the forming diameter (outer diameter) of R 1, FRP layer 11 of the outer periphery of the core member 10, i.e., a coil constituting the coil spring 1
  • R 1 / R 2 satisfy 0 ⁇ R 1 / R 2 ⁇ 0.8 in terms of reducing the weight and improving the strength of the coil spring 1.
  • the FRP layer 11 is a layer formed by winding a plurality of reinforcing fibers 12 around the core material 10.
  • the reinforcing fiber 12 at least one fiber selected from carbon fiber, glass fiber, an aramid fiber that is an aromatic polyamide fiber, and a basalt fiber that is a basalt fiber is used.
  • the FRP layer 11 At least some of the reinforcing fibers 12 (adjacent reinforcing fibers) are fixed to each other with a thermosetting resin. That is, the FRP layer 11 includes the plurality of reinforcing fibers 12 described above and a thermosetting resin that fixes the reinforcing fibers 12 to each other.
  • the thermosetting resin include a resin that is cured by heat at a temperature lower than the melting point of the core material 10 and the reinforcing fiber 12, such as an epoxy resin.
  • a thermoplastic resin may be used instead of the thermosetting resin.
  • the reinforcing fiber 12 in the FRP layer 11 may be one in which fibers are wound around the core material 10 one by one, or a plurality of fibers are bundled and a plurality of bundles are wound around the core material 10. In any winding, the winding direction of each fiber is aligned. In addition, a fiber bundle in which a plurality of fibers form a sheet shape may be provided on the outer surface of the core material 10 with the longitudinal direction of the fibers aligned. One or more reinforcing fibers are wound around the radial direction of the wire.
  • the reinforcing fiber 12 is continuous from one end to the other end of the wire extending in a spiral shape in terms of improving the strength of the coil spring 1 (FRP layer 11).
  • the reinforcing fiber 12 is discontinuous, a load applied from the outside cannot be borne by the entire wire, and stress concentrates on the discontinuous portion and tends to be a starting point of the wire.
  • each reinforcing fiber 12 extends spirally from one end to the other end of the wire and is continuous along the circumferential direction with respect to the core material 10.
  • a reinforced fiber as a material which comprises the core material 10
  • the winding direction in which the reinforcing fibers 12 are wound around the core material 10 is, for example, that the winding angle of the core material 10 is 20 ° or more and 85.
  • the reinforcing fiber 12 is wound so that the winding direction of the reinforcing fiber 12 is any angle in the range of greater than ⁇ 90 ° and less than 0 °, preferably around ⁇ 45 °.
  • the winding direction of the reinforcing fiber 12 is any angle in the range of greater than 0 ° and less than 90 °, It is preferably wound around + 45 °.
  • the reinforcing fiber 12 is a direction along the direction of the tensile load among the tensile load and the compressive load that is a load applied to the wire when at least the winding direction Y1 of the reinforcing fiber 12 on the outer surface is loaded from the outside.
  • 4A and 4B are schematic views showing the configuration of the main part of the coil spring wire according to one embodiment of the present invention, and when torsional stress is applied to the coil spring wire, It is a figure explaining the applied load.
  • shear stress ⁇ 11 , ⁇ 12 , ⁇ 21 , ⁇ 22 shown in FIG. 4A is applied to the fine region M.
  • shear stress ⁇ 11 , ⁇ 12 , ⁇ 21 , ⁇ 22 is applied to the wire, in other words, a tensile load F T and a compressive load F C as shown in FIG. 4B are applied to the fine region M. .
  • Coil springs 1 which pulsating stress direction of the torsion by compression is in one direction is applied, tensile load F T becomes only one direction.
  • those Reversed stress such as torsion bars to be applied, since the applied reverse rotation of torsional stress to the load F 1, F 2, and the load F T pull, the tensile load perpendicular to the tensile load F T two Directional tensile load will be applied.
  • the winding direction of the core material 10 is wound along the direction opposite to the tensile load, and the winding direction of the reinforcing fiber 12 is wound along the direction of the tensile load. It is preferable.
  • the reinforcing fibers 12 are all wound along a predetermined direction (so as to have a predetermined winding angle).
  • the reinforcing fibers 12 may be partially wound at different winding angles, but are preferably wound around the core member 10 at a constant winding angle.
  • the “constant winding angle” includes an error in the winding angle in manufacturing.
  • the coil spring 1 has a rigidity of 10 GPa or more and 50 GPa or less and / or a static torsional strength of 500 MPa from the viewpoint of improving the fatigue strength of the wire and ensuring the strength of the coil spring used for the suspension or the like. It is preferable that it is 2000 MPa or less.
  • the winding direction is opposite to the central axis N1 of the coil spring 1, for example, if one is + 45 °. They cross each other so that the other is ⁇ 45 °. If that core 10 and reinforcing fibers 12 intersect one another, winding direction Y1 of the reinforcing fibers 12, when a direction along the direction of the tensile load, the load F T tensile reinforcing fibers 12 is applied, above As described above, the load in the direction of reducing the diameter is applied to the FRP layer 11. However, since the winding direction of the core material 10 is opposite to that of the reinforcing fiber 12, the core material 10 tends to be deformed in the direction of increasing the diameter. . Thereby, the diameter reduction of the FRP layer 11 can be suppressed.
  • FIG. 5 is a cross-sectional view showing a configuration of a coil spring wire that is a wire for producing the coil spring 1.
  • a coil spring wire rod 100 (hereinafter, simply referred to as “wire rod 100”) shown in FIG. 1 is made of the same material as the core member 10 and has a cylindrical core member 110 that is a spiral tube formed by winding a belt-like member, and a reinforcing member.
  • a cylindrical structure having a two-layer structure including an FRP layer 111 formed by winding reinforcing fibers 112 made of the same fibers as the fibers 12 around the outer periphery of the core material 110 is formed.
  • the reinforcing fibers 112 wound around the core material 110 may be impregnated with a liquid thermosetting resin in advance, or may be impregnated with a thermosetting resin after each winding.
  • the winding direction Y10 (winding angle ⁇ ) of the reinforcing fiber 112 is the same as the winding direction Y1 described above.
  • FIG. 6 and FIG. 6 and 7 are views for explaining a method of manufacturing a coil spring wire according to an embodiment of the present invention.
  • the core material 110 is a spiral tube formed by winding a belt-like member.
  • the interval formed along the longitudinal direction is zero (thickly wound) or smaller than the width of the belt-shaped member.
  • the distance between the band-shaped members is preferably smaller than the width of the band-shaped member from the viewpoint of improving the strength of the core member 10.
  • the core material 110 is subjected to a surface treatment for improving the adhesion with the thermosetting resin on the outer surface in terms of improving the adhesion between the core material 110 and the FRP layer 111.
  • a surface treatment for improving the adhesion with the thermosetting resin on the outer surface in terms of improving the adhesion between the core material 110 and the FRP layer 111.
  • the surface treatment include surface treatment by a physical method such as chemicals or blasting, surface coating treatment by a primer or a coupling agent, purification by plasma or ultraviolet rays, activation treatment, and the like.
  • the core material 110 is subjected to a treatment for applying a residual stress from the viewpoint of improving the strength of the core material 110.
  • a treatment for applying a residual stress examples include a quenching process and a tempering process as a process for changing material characteristics such as a shot peening process.
  • the reinforcing fiber 112 previously impregnated with a liquid thermosetting resin is wound around the core 110 (see FIG. 7).
  • the winding direction Y21 of the core 110 with respect to the central axis N10 and the winding direction Y22 of the reinforcing fibers 112 are different from each other and are opposite to each other with respect to the central axis N10.
  • the winding direction Y21 is the same as the winding direction Y10 described above.
  • the wire After winding the reinforcing fiber 112, the wire is heated at a temperature higher than the temperature at which the thermosetting resin of the reinforcing fiber 112 is cured and lower than the melting point of the core material 110 and the reinforcing fiber 112.
  • the thermosetting resin is cured by heating, the adjacent reinforcing fibers 112 are fixed to each other.
  • the core material 110 that is a spiral tube, the FRP layer 111 including a plurality of reinforcing fibers 112 and a thermosetting resin that fixes the reinforcing fibers 112 to each other are formed, and the wire shown in FIG. 100 can be obtained.
  • the core material 110 is a hollow hollow member, it is possible to remove the air bubbles taken into the FRP layer 111 from the inside of the wire material, reducing the porosity of the wire material and reducing the strength. It is possible to reduce the remaining of the bubbles that cause
  • a filament winding method may be mentioned.
  • the fiber bundle in which the some fiber has comprised the sheet form it can also be formed by the sheet
  • the coil spring 1 described above can be manufactured by winding the wire 100 into a coil shape.
  • the wire 100 can also be used as an elastic member to which a one-way swing (the above-described tensile load) is applied.
  • the core material 10 is a spiral tube formed by winding a belt-shaped member, and the reinforcing fibers 12 are provided.
  • the coil spring is wound so as to intersect with the core material 10, so that the coil spring is wound by the core material 10 that is wound in the direction opposite to the winding direction of the reinforcing fiber 12 while reducing the weight by making it hollow.
  • the strength against shear fracture of the FRP layer 11 due to the reduced diameter of the wire rod can be improved.
  • the core member 10 is a spiral tube formed by winding a belt-like member, the coil spring 1 can be easily bent as compared with a solid bar member or a pipe.
  • the moldability of can be improved.
  • it is a solid metal core, it is difficult to bend because it is difficult to bend, and once it is plastically deformed, it will remain slack, and even if it is hollow, it will be bent at the time of molding, resulting in poor molding.
  • FIG. 8 is a schematic diagram showing a configuration of a coil spring according to a modification of the present embodiment. In the coil spring 1 a shown in FIG. 8, an electrolytic corrosion prevention layer 13 made of an insulating material is provided between the core material 10 and the FRP layer 11.
  • the electrolytic corrosion prevention layer 13 is formed of an insulating oxide film such as an insulating GFRP layer or an alumite layer.
  • the thickness of the electric corrosion prevention layer 13 (the thickness in the radial direction of the core material 10) may be sufficient if insulating properties can be ensured.
  • the GFRP layer has a sufficient effect even if it is about 0.1 mm.
  • the galvanic corrosion prevention layer 13 the core material 10 can be prevented from being deteriorated by galvanic corrosion. Further, the formation of the electrolytic corrosion prevention layer 13 can provide a rust prevention effect.
  • Torsion strength test A strain gauge was affixed to the wire for characteristic measurement, and a torsion test was conducted at a rotational speed around the central axis of the wire of 0.3 ° / second. The static torsional strength of the coil spring wire (carbon fiber) was determined by this torsional strength test.
  • FIG. 9 is a schematic diagram for explaining the porosity according to the embodiment of the present invention.
  • the porosity of the region R 3 is measured as the inner porosity of the inner layer, which is the layer closer to the core of the coil spring wire, and the outer pores of the outer layer of the coil spring wire are measured.
  • the porosity of the region R 4 was measured.
  • Example 1 As a mandrel, a hard steel wire having a thickness of 1 mm was wound along the longitudinal direction to produce a spiral tube having an outer diameter of ⁇ 7 mm. As the hard steel wire, a hard steel wire with a diameter of 3 mm was rolled to a thickness of 1 mm. At this time, the angle formed between the winding central axis of the spiral tube and the winding direction was about -70 °. This was cut into a length of 3000 mm to obtain a core material of Example 1.
  • an FRP layer was formed on the core material.
  • a fiber bundle of carbon fibers impregnated with a mixed solution of an epoxy resin, which is a thermosetting resin, and a crosslinking agent the fiber bundle stretching direction is + 45 ° with respect to the longitudinal direction of the core material.
  • an uncured carbon fiber reinforced plastic (CFRP) wire having a uniform outer diameter of about 18 mm is used as a wire for a coil spring.
  • CFRP carbon fiber reinforced plastic
  • an uncured CFRP wire having an outer diameter of about 14 mm was formed as a wire for measuring characteristics. Thereafter, the wire was heated at 100 ° while applying a tensile load ⁇ 500 grams to the wire in an oven and then cured by heating at 150 °.
  • the coil spring of Example 1 and a coil spring wire for characteristic measurement were obtained.
  • Table 1 shows the configuration and test results of the coil spring and the wire for characteristic measurement according to Example 1. The torsional strength test, rigidity, and porosity (inside and outside) were measured using a coil spring wire for measuring the characteristics of ⁇ 14 mm.
  • Example 2 A wire material for a coil spring of Example 2 was obtained in the same manner as in Example 1 except that the angle formed between the central axis of winding of the spiral tube and the winding direction was about ⁇ 50 °. Table 1 shows the configuration and test results of the coil spring wire according to Example 2.
  • Example 3 A coil spring is formed when a coil spring is formed by winding a coil spring wire rod around a spirally grooved mold in place of an epoxy resin which is a thermosetting resin of the FRP layer instead of a thermoplastic resin.
  • the wire for the coil spring of Example 3 was obtained in the same manner as in Example 1 except that the wire was heated in advance at a temperature at which the resin was softened at a constant temperature (about 150 ° C.). Table 1 shows the configuration and test results of the coil spring wire according to Example 3.
  • Example 4 A coil spring is formed when a coil spring is formed by winding a coil spring wire rod around a spirally grooved mold in place of an epoxy resin which is a thermosetting resin of the FRP layer instead of a thermoplastic resin.
  • the wire for the coil spring of Example 4 was obtained in the same manner as in Example 2 except that the wire was heated in advance at a temperature at which the resin was softened at a constant temperature (about 150 ° C.).
  • Table 1 shows the configuration and test results of the coil spring wire according to Example 4.
  • Example 5 As a mandrel to be attached to a filament winding machine, a spiral tube with an outer diameter of ⁇ 7 mm is prepared by winding a carbon reinforced fiber plastic (CFRP) with a thickness of 1 mm along the longitudinal direction, and cut into a length of 3000 mm to obtain a core material.
  • a coil spring wire of Example 5 was obtained in the same manner as Example 1 except that. At this time, the angle formed by the winding axis of the spiral tube and the winding direction was about ⁇ 60 °. Table 1 shows the configuration and test results of the coil spring wire according to Example 5.
  • CFRP carbon reinforced fiber plastic
  • Example 6 The coil spring wire of Example 6 was obtained by inserting a polypropylene (PP) resin core into the coil spring wire prepared in Example 5 to prevent foreign material from entering the coil spring.
  • Table 1 shows the configuration and test results of the coil spring wire according to Example 6.
  • Comparative Example 1 A round bar made of a 5000 series aluminum material having an outer diameter of 7 mm was used as a mandrel as a core material. Other conditions were the same as in Example 1, and the wire for a coil spring of Comparative Example 1 was obtained. Table 1 shows the configuration and characteristics of the coil spring wire according to Comparative Example 1.
  • Comparative Example 2 A round bar made of a pure aluminum material having an outer diameter of 7 mm was used as a mandrel as a core material. Other conditions were the same as in Example 1, and the wire for a coil spring of Comparative Example 2 was obtained. Table 1 shows the configuration and characteristics of the coil spring wire according to Comparative Example 2.
  • Comparative Example 3 A round bar made of a 5000 series aluminum material having an outer diameter of 7 mm was used as a mandrel as a core material. Other conditions were the same as in Example 3, and the wire for a coil spring of Comparative Example 3 was obtained. Table 1 shows the configuration and characteristics of the coil spring wire according to Comparative Example 3.
  • Comparative Example 4 A round bar made of a pure aluminum material having an outer diameter of 7 mm was used as a mandrel as a core material. Other conditions were the same as in Example 4, and the wire for a coil spring of Comparative Example 4 was obtained. Table 1 shows the configuration and characteristics of the coil spring wire according to Comparative Example 4.
  • Comparative Example 5 A cylindrical pipe made of pure aluminum material having an outer diameter of 7 mm and a thickness of 1 mm was used as a mandrel as a core material. Other conditions were the same as in Example 1, and the wire for a coil spring of Comparative Example 5 was obtained. Table 1 shows the configuration and characteristics of the coil spring wire according to Comparative Example 5.
  • Comparative Example 6 A round bar made of polypropylene (PP) having an outer diameter of 7 mm was used as a mandrel as a core material. Other conditions were the same as in Example 1, and the wire for a coil spring of Comparative Example 6 was obtained. Table 1 shows the configuration and characteristics of the coil spring wire according to Comparative Example 6.
  • Comparative Example 7 A cylindrical polypropylene (PP) pipe having an outer diameter of 7 mm and a thickness of 1 mm was used as a mandrel as a core material. Other conditions were the same as in Example 1, and the wire for a coil spring of Comparative Example 7 was obtained. Table 1 shows the configuration and characteristics of the coil spring wire according to Comparative Example 7.
  • PP polypropylene
  • the wire rods for coil springs according to Examples 1 to 4 have substantially the same torsional strength and rigidity as compared with those using a round bar made of an aluminum material as a core (Comparative Examples 1 to 4). It can be said that the strength is high. Further, the coiling property was good and the wire could be easily wound.
  • the wires of Comparative Examples 1 to 4 using a round bar made of an aluminum material were difficult to deform and difficult to wind.
  • the coiling property of Comparative Example 6 using a PP round bar as a core was good, but the rigidity and torsional strength of the wire were low.
  • the present invention can include various embodiments not described herein, and various design changes and the like can be made without departing from the technical idea specified by the claims. Is possible.
  • the wire for a coil spring and the coil spring according to the present invention are suitable for improving the strength while reducing the weight.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Textile Engineering (AREA)
  • Springs (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

This coil spring wire rod is used for producing a coil spring, said coil spring wire rod comprising a helical core rod that is formed using a long member, and an FRP layer that is obtained by winding reinforcement fibers around the core rod and that covers the outer surface of the core rod, wherein the winding directions of the core rod and the reinforcement fibers are directions opposite one another with respect to the center axis of the coil spring wire rod.

Description

コイルばね用線材およびコイルばねCoil spring wire and coil spring
　本発明は、コイルばね用線材およびこのコイルばね用線材を用いたコイルばねに関する。 The present invention relates to a coil spring wire and a coil spring using the coil spring wire.
　従来、自動車の燃費向上を実現するための一つの方策として、各種部品の軽量化が追求されている。例えば、エンジンブロックの材料として、鋳鉄の代わりにアルミニウム合金が使われ、エンジンカバーやオイルパンの材料として、鋼の代わりにマグネシウム合金が使われるとともに、フレームやボディの材料として、ＣＦＲＰ（Carbon　Fiber　Reinforced　Plastics）の採用が始まりつつある。 Conventionally, weight reduction of various parts has been pursued as one measure for improving the fuel efficiency of automobiles. For example, aluminum alloy is used instead of cast iron as the material for the engine block, magnesium alloy is used instead of steel as the material for the engine cover and oil pan, and CFRP (Carbon Fiber Reinforced) as the material for the frame and body. The adoption of Plastics) is starting.
　近年、自動車の軽量化という観点から、例えばサスペンション用の懸架ばねなどのコイルばねを軽量化することが検討されている。コイルばねなどの弾性部材を軽量化することが可能な弾性部材用線材として、中空の線材や、比重の軽いチタン線材、前述の線材と比して軽量効果が高い炭素繊維などの強化繊維を用いて形成されている繊維強化プラスチックを用いた弾性部材用線材が挙げられる（例えば、特許文献１，２を参照）。 In recent years, from the viewpoint of reducing the weight of automobiles, it has been studied to reduce the weight of coil springs such as suspension springs for suspension. As a wire material for elastic members that can reduce the weight of elastic members such as coil springs, hollow wires, titanium wires with a low specific gravity, and reinforced fibers such as carbon fibers that have a lighter weight effect than the aforementioned wires are used. For example, a wire for an elastic member using a fiber reinforced plastic formed in this manner (see, for example, Patent Documents 1 and 2).
　特許文献１には、可撓性を有する芯線と、芯線の軸方向に対する角度が１５°～８０°、または－８０°～－１５°となるように巻回されてなる補強繊維層と、芯線と補強繊維層とを結合する熱硬化性樹脂マトリックスからなる弾性部材用線材を用いたコイルばねが記載されている。しかしながら、特許文献１が開示する弾性部材用線材は、芯材に中実の金属を用いているため、軽量化率は小さかった。 Patent Document 1 discloses a flexible core wire, a reinforcing fiber layer wound so that the angle of the core wire with respect to the axial direction is 15 ° to 80 °, or −80 ° to −15 °, and a core wire. A coil spring using a wire for an elastic member made of a thermosetting resin matrix that joins a reinforcing fiber layer is described. However, since the wire for elastic members disclosed in Patent Document 1 uses a solid metal for the core, the weight reduction rate is small.
　これに対し、ねじり応力に対する強度を向上させる技術として、特許文献２には、芯材の軸心方向に対して所定の角度で繊維を芯材に巻き付けた弾性部材用線材が開示されている。 On the other hand, as a technique for improving the strength against torsional stress, Patent Document 2 discloses a wire for an elastic member in which fibers are wound around a core material at a predetermined angle with respect to the axial direction of the core material.
特開昭５８－２８０２９号公報JP 58-28029 A 特開２００６－２２６３２７号公報JP 2006-226327 A
　特許文献２が開示する弾性部材用線材は、小さなコイルばねについて実施例が記載されているが、例えば、自動車用の懸架ばねなどに用いるには大きな耐荷重に対応できる線材径もコイル寸法も大きなコイルばねが必要となり、コイルばねが圧縮されて加わるねじり荷重によっておこる線材の縮径による破壊については考慮されておらず、芯材の材質によっては縮径し強度も剛性率も低いものとなって使用できる特性を有するものとはならなかった。 An example of the wire for elastic member disclosed in Patent Document 2 is described for a small coil spring. For example, a wire diameter and a coil size that can handle a large load resistance are large for use in a suspension spring for an automobile. A coil spring is required, and the damage due to the diameter reduction of the wire rod caused by the torsional load that is applied when the coil spring is compressed is not considered, and depending on the core material, the diameter is reduced and the strength and rigidity are low. It did not have the characteristics that could be used.
　本発明は、上記に鑑みてなされたものであって、軽量化しつつ、強度を向上することができるコイルばね用線材およびコイルばねを提供することを目的とする。 This invention is made in view of the above, Comprising: It aims at providing the wire material for coil springs and coil spring which can improve intensity | strength, reducing in weight.
　上述した課題を解決し、目的を達成するために、本発明に係るコイルばね用線材は、コイルばねを作製するためのコイルばね用線材であって、長尺の部材を用いて形成された螺旋状をなす芯材と、前記芯材に巻回してなる強化繊維を有し、前記芯材の外表面を覆うＦＲＰ層と、を備え、前記芯材および前記強化繊維は、巻回する方向が、当該コイルばね用線材の中心軸に対して互いに反対方向であることを特徴とする。 In order to solve the above-described problems and achieve the object, a coil spring wire according to the present invention is a coil spring wire for producing a coil spring, and is a spiral formed using a long member. And a reinforcing fiber formed by winding the core material, and an FRP layer covering the outer surface of the core material. The core material and the reinforcing fiber have a winding direction. The coil spring wires are opposite to each other with respect to the central axis.
　また、本発明に係るコイルばね用線材は、上記の発明において、前記強化繊維は、少なくとも外表面の前記強化繊維の前記芯材に対して巻回する方向が、外部から加わる荷重であって当該コイルばね用線材にねじり応力を加える荷重に応じて当該コイルばね用線材に印加される引張り荷重の方向に沿った方向であることを特徴とする。 In the coil spring wire according to the present invention, in the above invention, the reinforcing fiber is a load applied from the outside in a direction in which at least the reinforcing fiber on the outer surface is wound around the core material. It is a direction along the direction of the tensile load applied to the coil spring wire according to the load that applies torsional stress to the coil spring wire.
　また、本発明に係るコイルばね用線材は、上記の発明において、前記芯材は、巻回の中心軸と巻回方向とのなす角度が一定であることを特徴とする。 Further, the coil spring wire according to the present invention is characterized in that, in the above-mentioned invention, the core material has a constant angle between a winding central axis and a winding direction.
　また、本発明に係るコイルばね用線材は、上記の発明において、前記芯材は、帯状部材を螺旋状に巻回してなり、長手方向に沿って形成される間隔が、前記帯状部材の幅より小さいことを特徴とする。 In the coil spring wire according to the present invention, in the above invention, the core is formed by spirally winding a band-shaped member, and an interval formed along the longitudinal direction is larger than a width of the band-shaped member. It is small.
　また、本発明に係るコイルばね用線材は、上記の発明において、前記芯材は、鉄鋼材、またはアルミニウム、マグネシウムもしくはチタンを主成分とする合金、またはＦＲＰを用いて形成されていることを特徴とする。 The wire for a coil spring according to the present invention is characterized in that, in the above invention, the core is formed using a steel material, an alloy containing aluminum, magnesium or titanium as a main component, or FRP. And
　また、本発明に係るコイルばね用線材は、上記の発明において、前記長尺の部材を用いて形成された芯材は、該芯材の長手方向からみた外周のなす形状が矩形、円、楕円状または多角形状をなすことを特徴とする。 Further, the wire for a coil spring according to the present invention is the above-described invention, wherein the core formed using the long member has a rectangular shape, a circle, an ellipse formed by an outer periphery viewed from the longitudinal direction of the core material. It is characterized by having a shape or a polygonal shape.
　また、本発明に係るコイルばね用線材は、上記の発明において、前記長尺の部材は、長手方向と直交する断面が矩形、円、楕円状または多角形状をなすことを特徴とする。 The coil spring wire according to the present invention is characterized in that, in the above invention, the long member has a rectangular, circular, elliptical or polygonal cross section perpendicular to the longitudinal direction.
　また、本発明に係るコイルばね用線材は、上記の発明において、樹脂を主成分とし、前記芯材の内部に設けられてなる充填材を備えたことを特徴とする。 Further, the wire material for a coil spring according to the present invention is characterized in that, in the above-mentioned invention, the wire material is mainly composed of a resin and is provided inside the core material.
　また、本発明に係るコイルばね用線材は、上記の発明において、前記芯材と前記強化繊維との間に設けられた電蝕防止部を備えたことを特徴とする。 Further, the coil spring wire according to the present invention is characterized in that, in the above-described invention, an electrolytic corrosion prevention portion provided between the core material and the reinforcing fiber is provided.
　また、本発明に係るコイルばね用線材は、上記の発明において、前記ＦＲＰ層は、前記強化繊維同士を固定する熱硬化性樹脂を含み、前記芯材は、外表面に前記熱硬化性樹脂との接着性を向上させる表面処理が施されていることを特徴とする。 In the coil spring wire according to the present invention, in the above invention, the FRP layer includes a thermosetting resin that fixes the reinforcing fibers to each other, and the core material includes the thermosetting resin on an outer surface. The surface treatment which improves the adhesiveness of this is performed.
　また、本発明に係るコイルばね用線材は、上記の発明において、前記強化繊維は、前記芯材に対する周回方向に沿って連続していることを特徴とする。 In addition, the wire for a coil spring according to the present invention is characterized in that, in the above invention, the reinforcing fibers are continuous along a circumferential direction with respect to the core material.
　また、本発明に係るコイルばねは、上記の発明に係るコイルばね用線材を巻回してなることを特徴とする。 Further, the coil spring according to the present invention is characterized in that the coil spring wire according to the present invention is wound.
　また、本発明に係るコイルばねは、上記の発明において、圧縮コイルばねであることを特徴とする。 The coil spring according to the present invention is a compression coil spring in the above invention.
　また、本発明に係るコイルばねは、上記の発明において、自動車用の懸架ばねであることを特徴とする。 The coil spring according to the present invention is a suspension spring for automobiles in the above invention.
　本発明によれば、コイルばね用線材を用いて作製したコイルばねにおいて、軽量化しつつ、強度を向上することができるという効果を奏する。 According to the present invention, the coil spring manufactured using the coil spring wire has the effect of improving the strength while reducing the weight.
図１は、本発明の一実施の形態に係るコイルばねの構成を示す模式図である。FIG. 1 is a schematic diagram showing a configuration of a coil spring according to an embodiment of the present invention. 図２は、本発明の一実施の形態に係るコイルばねの要部の構成を説明する模式図である。FIG. 2 is a schematic diagram illustrating a configuration of a main part of the coil spring according to the embodiment of the present invention. 図３は、本発明の一実施の形態に係るコイルばねの要部の構成を説明する模式図である。FIG. 3 is a schematic diagram illustrating the configuration of the main part of the coil spring according to the embodiment of the present invention. 図４Ａは、本発明の一実施の形態に係るコイルばねの要部の構成を示す模式図である。FIG. 4A is a schematic diagram illustrating a configuration of a main part of the coil spring according to the embodiment of the present invention. 図４Ｂは、本発明の一実施の形態に係るコイルばねの要部の構成を示す模式図である。FIG. 4B is a schematic diagram illustrating a configuration of a main part of the coil spring according to the embodiment of the present invention. 図５は、本発明の一実施の形態に係るコイルばね用線材の構成を示す模式図である。FIG. 5 is a schematic diagram showing a configuration of a coil spring wire according to an embodiment of the present invention. 図６は、本発明の一実施の形態に係るコイルばね用線材の製造方法を説明する図である。FIG. 6 is a diagram for explaining a method of manufacturing a coil spring wire according to an embodiment of the present invention. 図７は、本発明の一実施の形態に係るコイルばね用線材の製造方法を説明する図である。FIG. 7 is a diagram for explaining a method of manufacturing a coil spring wire according to an embodiment of the present invention. 図８は、本発明の実施の形態の変形例に係るコイルばねの構成を示す模式図である。FIG. 8 is a schematic diagram showing a configuration of a coil spring according to a modification of the embodiment of the present invention. 図９は、本発明の実施例に係る気孔率について説明する模式図である。FIG. 9 is a schematic diagram for explaining the porosity according to the embodiment of the present invention.
　以下、添付図面を参照して本発明を実施するための形態（以下、「実施の形態」という）を説明する。なお、図面は模式的なものであって、各部分の厚みと幅との関係、それぞれの部分の厚みの比率などは現実のものとは異なる場合があり、図面の相互間においても互いの寸法の関係や比率が異なる部分が含まれる場合がある。 Hereinafter, modes for carrying out the present invention (hereinafter referred to as “embodiments”) will be described with reference to the accompanying drawings. The drawings are schematic, and the relationship between the thickness and width of each part, the ratio of the thickness of each part, and the like may be different from the actual ones, and the mutual dimensions between the drawings. There may be cases where the relationship and ratio of are different.
　図１は、本発明の一実施の形態に係るコイルばねの構成を示す模式図である。図２は、本発明の一実施の形態に係るコイルばねの要部の構成を示す模式図である。図３は、本発明の一実施の形態に係るコイルばねの要部の構成を示す模式図であって、線材の中心軸方向からみた平面図である。コイルばね１は、芯材に繊維を巻き付けてなる線材を螺旋状に巻くことによって作製される。コイルばね１は、所定の方向（例えば、巻回する方向）に圧縮されるものである。コイルばね１は、例えば、自動車のサスペンション用の懸架ばねとして用いられる。 FIG. 1 is a schematic diagram showing a configuration of a coil spring according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing a configuration of a main part of the coil spring according to the embodiment of the present invention. FIG. 3 is a schematic diagram showing the configuration of the main part of the coil spring according to the embodiment of the present invention, and is a plan view seen from the central axis direction of the wire. The coil spring 1 is manufactured by winding a wire formed by winding a fiber around a core material in a spiral shape. The coil spring 1 is compressed in a predetermined direction (for example, a winding direction). The coil spring 1 is used, for example, as a suspension spring for an automobile suspension.
　コイルばね１は、金属、合金または繊維強化プラスチック（Fiber　Reinforced　Plastics：ＦＲＰ）を用いて形成された芯材１０と、芯材１０に巻き付けられる複数の強化繊維１２を含み、該芯材１０を覆うＦＲＰ層１１とを有し、螺旋状をなす。コイルばね１は、懸架ばねとして用いる場合の強度として、その線材の剛性率が１０ＧＰａ以上であり、静的ねじり強度が５００ＭＰａ以上であることが好ましい。 The coil spring 1 includes a core material 10 formed using a metal, an alloy, or a fiber reinforced plastic (FRP), and a plurality of reinforcing fibers 12 wound around the core material 10, and covers the core material 10. It has an FRP layer 11 and has a spiral shape. The coil spring 1 preferably has a strength of 10 GPa or more and a static torsional strength of 500 MPa or more as strength when used as a suspension spring.
　芯材１０は、長尺の帯状部材を螺旋状に巻回してなるスパイラルチューブである。芯材１０は、例えば、アルミニウム、マグネシウムまたはチタンを主成分とする合金などの軽量な合金、ＦＲＰで形成される。より具体的に、例えば、アルミニウム合金としては、２０００系、５０００系、６０００系、７０００系のアルミニウム合金がある。ＦＲＰに用いられる強化繊維としては、炭素繊維、ガラス繊維、芳香族ポリアミド繊維であるアラミド繊維、および玄武岩繊維であるバサルト繊維から選択される少なくとも一つの繊維が用いられ、芯材１０としての強度を付与する点で炭素繊維およびガラス繊維であることが好ましい。また、スパイラルチューブは中実芯よりも軽量であるため、鉄鋼材や、硬鋼線のように重量の大きな金属も使用できる。本実施の形態では、芯材１０を構成する帯状部材の断面（延伸方向と直交する断面）が矩形（長方形）をなすものとして説明するが、円をなすものや、楕円状、多角形状（正方形を含む）をなすものであってもよい。換言すれば、長尺の帯状部材は、長手方向と直交する断面が矩形（長方形）をなすものとして説明するが、円をなすものや、楕円状、多角形状（正方形を含む）をなす長尺の部材であってもよい。芯材１０の形状については後述する。 The core material 10 is a spiral tube formed by winding a long belt-like member in a spiral shape. The core material 10 is made of, for example, a lightweight alloy such as an alloy mainly composed of aluminum, magnesium, or titanium, or FRP. More specifically, examples of the aluminum alloy include 2000 series, 5000 series, 6000 series, and 7000 series aluminum alloys. As the reinforcing fiber used for FRP, at least one fiber selected from carbon fiber, glass fiber, aramid fiber which is an aromatic polyamide fiber, and basalt fiber which is a basalt fiber is used, and the strength as the core material 10 is increased. It is preferable that they are carbon fiber and glass fiber at the point to provide. Further, since the spiral tube is lighter than the solid core, a heavy metal such as a steel material or a hard steel wire can be used. In the present embodiment, the cross-section (cross-section perpendicular to the extending direction) of the band-shaped member constituting the core material 10 is described as being rectangular (rectangular). However, the cross-shaped member is circular, elliptical, polygonal (square) May be included). In other words, the long band-shaped member is described as a rectangular (rectangular) cross section orthogonal to the longitudinal direction. However, the long band-shaped member has a circular shape, an elliptical shape, or a polygonal shape (including a square shape). It may be a member. The shape of the core material 10 will be described later.
　芯材１０が鉄鋼材や、硬鋼線、アルミニウム、マグネシウムまたはチタンを主成分とする合金などの軽量な合金を用いて形成されている場合、芯材１０は、中心軸Ｎ１と直交する方向からみて、スパイラルチューブの巻回角度が中心軸Ｎ１に対して上向きでは２０°以上８５°以下、または下向きでは－８５°以上－２０°以下の範囲のいずれかの角度となるように巻回されている。また、例えば、芯材１０がＦＲＰを用いて形成されている場合、芯材１０は、スパイラルチューブの巻回角度が中心軸Ｎ１に対して上向きでは４５°以上８０°以下、または下向きでは－８０°以上－４５°以下の範囲のいずれかの角度となるように巻回されている。芯材１０は、巻回の中心軸Ｎ１方向からみて外周のなす形状が円をなすものとして説明するが、矩形、楕円状または多角形状をなすものであってもよい。ここでいう「上向き」、「下向き」とは、例えば、所定の方向に延びる中心軸Ｎ１に対して、巻回により部材が延びる向きを指している。この中心軸は、実際にはコイルばね１を構成するコイルばね用線材に沿って螺旋状をなしている。 When the core material 10 is formed using a steel material or a light alloy such as a hard steel wire, an alloy mainly composed of aluminum, magnesium, or titanium, the core material 10 is from a direction orthogonal to the central axis N1. Thus, the spiral tube is wound so that the winding angle is in the range of 20 ° to 85 ° upward with respect to the central axis N1, or in the range of −85 ° to −20 ° downward. Yes. Further, for example, when the core material 10 is formed using FRP, the core material 10 has a spiral tube winding angle of 45 ° to 80 ° upward with respect to the central axis N1, or −80 when downward. It is wound to have an angle in the range of not less than ° and not more than -45 °. Although the core material 10 is described as having a circular shape on the outer periphery when viewed from the direction of the central axis N1 of winding, the core material 10 may be rectangular, elliptical, or polygonal. Here, “upward” and “downward” refer to the direction in which the member extends by winding with respect to the central axis N1 extending in a predetermined direction, for example. The central axis is actually spiral along the coil spring wire constituting the coil spring 1.
　なお、芯材１０は、部分的に中心軸Ｎ１に対する巻回方向の角度が異なっていてもよいが、一定の角度で巻回されることが好ましい。ここでいう「一定の角度」とは、製造上における巻付け角度の誤差を含んでいる。 The core material 10 may be partially wound at an angle in the winding direction with respect to the central axis N1, but is preferably wound at a certain angle. The “certain angle” here includes an error of a winding angle in manufacturing.
　また、芯材１０は、内部において、防錆処理が施されていてもよい。具体的には、芯材１０の内部側に防錆剤を塗布することにより防錆処理が施される。また、芯材１０は、外周が、絶縁材料からなる樹脂またはＦＲＰからなる被覆層を有していてもよい。 Further, the core material 10 may be subjected to rust prevention treatment inside. Specifically, a rust prevention treatment is performed by applying a rust inhibitor on the inner side of the core material 10. Moreover, as for the core material 10, the outer periphery may have the coating layer which consists of resin which consists of insulating materials, or FRP.
　また、芯材１０は、内部に樹脂製の芯が設けられていてもよいし、内部に樹脂が充填されていてもよいし、両端の開口を塞ぐ蓋が設けられていてもよい。これにより、芯材１０の内部への異物の侵入を防止することができる。 Further, the core material 10 may be provided with a resin core inside, may be filled with resin inside, or may be provided with a lid for closing the openings at both ends. Thereby, the penetration | invasion of the foreign material to the inside of the core material 10 can be prevented.
　本実施の形態に係るコイルばね１は、図３に示すように、芯材１０の外周のなす径（外径）をＲ1、ＦＲＰ層１１の外周のなす径、すなわちコイルばね１をなすコイルばね用線材の外径をＲ2としたとき、Ｒ1／Ｒ2が、０＜Ｒ1／Ｒ2＜０．８を満たすことが、コイルばね１を軽量化と強度を向上させる点で好ましい。 Coil spring 1 according to this embodiment, as shown in FIG. 3 forms the diameter of the circumference of the forming diameter (outer diameter) of R 1, FRP layer 11 of the outer periphery of the core member 10, i.e., a coil constituting the coil spring 1 When the outer diameter of the spring wire is R 2 , it is preferable that R 1 / R 2 satisfy 0 <R 1 / R 2 <0.8 in terms of reducing the weight and improving the strength of the coil spring 1. .
　ＦＲＰ層１１は、複数の強化繊維１２を芯材１０に巻き付けることによって形成された層をなす。強化繊維１２としては、炭素繊維、ガラス繊維、芳香族ポリアミド繊維であるアラミド繊維、および玄武岩繊維であるバサルト繊維から選択される少なくとも一つの繊維が用いられる。 The FRP layer 11 is a layer formed by winding a plurality of reinforcing fibers 12 around the core material 10. As the reinforcing fiber 12, at least one fiber selected from carbon fiber, glass fiber, an aramid fiber that is an aromatic polyamide fiber, and a basalt fiber that is a basalt fiber is used.
　ＦＲＰ層１１において、少なくとも一部の強化繊維１２（隣り合う強化繊維）同士は、熱硬化性樹脂により互いに固着されている。すなわち、ＦＲＰ層１１は、上述した複数の強化繊維１２と、該強化繊維１２同士を固定する熱硬化性樹脂とを含んでいる。熱硬化性樹脂としては、芯材１０および強化繊維１２の融点より低い温度の熱により硬化する樹脂、例えばエポキシ樹脂が挙げられる。なお、熱硬化性樹脂に代えて、熱可塑性樹脂を用いてもよい。 In the FRP layer 11, at least some of the reinforcing fibers 12 (adjacent reinforcing fibers) are fixed to each other with a thermosetting resin. That is, the FRP layer 11 includes the plurality of reinforcing fibers 12 described above and a thermosetting resin that fixes the reinforcing fibers 12 to each other. Examples of the thermosetting resin include a resin that is cured by heat at a temperature lower than the melting point of the core material 10 and the reinforcing fiber 12, such as an epoxy resin. A thermoplastic resin may be used instead of the thermosetting resin.
　ＦＲＰ層１１における強化繊維１２は、繊維を一本ずつ芯材１０に巻き付けるものであってもよいし、複数の繊維を束にして、複数束を芯材１０に巻き付けるものであってもよい。いずれの巻き付けにおいても、各繊維の巻付け方向は揃っている。また、複数の繊維がシート状をなす繊維束を、繊維の長手方向を揃えて芯材１０の外表面に設けるようにしてもよい。また、線材の径方向には、一本または複数本の強化繊維が巻き付けられている。 The reinforcing fiber 12 in the FRP layer 11 may be one in which fibers are wound around the core material 10 one by one, or a plurality of fibers are bundled and a plurality of bundles are wound around the core material 10. In any winding, the winding direction of each fiber is aligned. In addition, a fiber bundle in which a plurality of fibers form a sheet shape may be provided on the outer surface of the core material 10 with the longitudinal direction of the fibers aligned. One or more reinforcing fibers are wound around the radial direction of the wire.
　また、強化繊維１２が、螺旋状に延びる線材の一端から他端にかけて連続していることが、コイルばね１（ＦＲＰ層１１）の強度を向上させる点で好ましい。強化繊維１２が不連続の場合、外部から加わる荷重を線材全体で負担できず、不連続部分に応力が集中して線材の破壊の起点となりやすい。強化繊維１２が線材の一端から他端にかけて連続する場合、各強化繊維１２が、線材の一端から他端にかけて螺旋状に延び、芯材１０に対する周回方向に沿って連続していることになる。なお、芯材１０を構成する材料として強化繊維を用いる場合も同様に、線材の一端から他端にかけて連続していることが好ましい。 Further, it is preferable that the reinforcing fiber 12 is continuous from one end to the other end of the wire extending in a spiral shape in terms of improving the strength of the coil spring 1 (FRP layer 11). When the reinforcing fiber 12 is discontinuous, a load applied from the outside cannot be borne by the entire wire, and stress concentrates on the discontinuous portion and tends to be a starting point of the wire. When the reinforcing fibers 12 are continuous from one end to the other end of the wire, each reinforcing fiber 12 extends spirally from one end to the other end of the wire and is continuous along the circumferential direction with respect to the core material 10. In addition, when using a reinforced fiber as a material which comprises the core material 10, it is preferable similarly from the one end of a wire to the other end.
　また、強化繊維１２が芯材１０に巻き付けられた巻付け方向（強化繊維１２が巻回する方向：図２の巻付け方向Ｙ１）は、例えば、芯材１０の巻回角度が２０°以上８５°以下の範囲の角度である場合、強化繊維１２の巻付け方向が、－９０°より大きく０°より小さい範囲のいずれかの角度、望ましくは－４５°近傍となるように巻き付けられている。これに対し、芯材１０の角度が－８５°以上－２０°以下の範囲の角度である場合、強化繊維１２の巻付け方向が、０°より大きく９０°より小さい範囲のいずれかの角度、望ましくは＋４５°近傍となるように巻き付けられている。 The winding direction in which the reinforcing fibers 12 are wound around the core material 10 (direction in which the reinforcing fibers 12 are wound: the winding direction Y1 in FIG. 2) is, for example, that the winding angle of the core material 10 is 20 ° or more and 85. When the angle is in the range of less than or equal to 0 °, the reinforcing fiber 12 is wound so that the winding direction of the reinforcing fiber 12 is any angle in the range of greater than −90 ° and less than 0 °, preferably around −45 °. On the other hand, when the angle of the core material 10 is in the range of −85 ° or more and −20 ° or less, the winding direction of the reinforcing fiber 12 is any angle in the range of greater than 0 ° and less than 90 °, It is preferably wound around + 45 °.
　強化繊維１２は、少なくとも外表面の強化繊維１２の巻付け方向Ｙ１が、外部から荷重が加わった際に、線材に加わる荷重である引張り荷重および圧縮荷重のうち、引張り荷重の方向に沿った方向であることが好ましい。図４Ａおよび図４Ｂは、本発明の一実施の形態に係るコイルばね用線材の要部の構成を示す模式図であって、コイルばね用線材にねじり応力が加わった際に、線材の表面に加わる荷重を説明する図である。コイルばね用線材に対し、該コイルばね用線材の中心軸のまわりの荷重であって、互いに反対まわりの荷重Ｆ1，Ｆ2によるねじり応力が加わった場合、コイルばね用線材の表面における矩形の微細領域Ｍでみると、該微細領域Ｍには、図４Ａに示すせん断応力τ11，τ12，τ21，τ22が加わる。線材にせん断応力τ11，τ12，τ21，τ22が加わることは、換言すれば、図４Ｂに示すような引張り荷重ＦTと、圧縮荷重ＦCとが微細領域Ｍに加わることになる。コイルばね１は、圧縮によりねじりの方向が一方向である片振り応力が加わるものであり、引張り荷重ＦTは、一方向のみとなる。これに対し、トーションバーなどの両振り応力が加わるものは、荷重Ｆ1，Ｆ2とは逆回りのねじり応力も加わるため、引張り荷重ＦTと、引張り荷重ＦTと直交する引張り荷重の二方向の引張り荷重が加わることとなる。 The reinforcing fiber 12 is a direction along the direction of the tensile load among the tensile load and the compressive load that is a load applied to the wire when at least the winding direction Y1 of the reinforcing fiber 12 on the outer surface is loaded from the outside. It is preferable that 4A and 4B are schematic views showing the configuration of the main part of the coil spring wire according to one embodiment of the present invention, and when torsional stress is applied to the coil spring wire, It is a figure explaining the applied load. When a torsional stress due to loads F 1 and F 2 that are loads around the central axis of the coil spring wire is applied to the coil spring wire, a rectangular shape on the surface of the coil spring wire Looking at the fine region M, shear stress τ 11 , τ 12 , τ 21 , τ 22 shown in FIG. 4A is applied to the fine region M. When the shear stress τ 11 , τ 12 , τ 21 , τ 22 is applied to the wire, in other words, a tensile load F T and a compressive load F C as shown in FIG. 4B are applied to the fine region M. . Coil springs 1, which pulsating stress direction of the torsion by compression is in one direction is applied, tensile load F T becomes only one direction. In contrast, those Reversed stress such as torsion bars to be applied, since the applied reverse rotation of torsional stress to the load F 1, F 2, and the load F T pull, the tensile load perpendicular to the tensile load F T two Directional tensile load will be applied.
　本実施の形態に係るコイルばね１は、芯材１０の巻回方向が引張り荷重とは反対方向に沿って巻回され、強化繊維１２の巻回方向が引張り荷重の方向に沿って巻回されていることが好ましい。強化繊維１２は、すべてが所定の方向に沿って（所定の巻回角度となるように）巻き付けられている。なお、強化繊維１２は、部分的に巻付け角度が異なっていてもよいが、一定の巻付け角度で芯材１０に巻き付けられることが好ましい。ここでいう「一定の巻付け角度」とは、製造上における巻付け角度の誤差を含んでいる。 In the coil spring 1 according to the present embodiment, the winding direction of the core material 10 is wound along the direction opposite to the tensile load, and the winding direction of the reinforcing fiber 12 is wound along the direction of the tensile load. It is preferable. The reinforcing fibers 12 are all wound along a predetermined direction (so as to have a predetermined winding angle). The reinforcing fibers 12 may be partially wound at different winding angles, but are preferably wound around the core member 10 at a constant winding angle. Here, the “constant winding angle” includes an error in the winding angle in manufacturing.
　また、コイルばね１は、線材の疲労強度を向上してサスペンションなどに用いるコイルばねの強度を確保するという観点で、その線材の剛性率が１０ＧＰａ以上５０ＧＰａ以下、および／または静的ねじり強度が５００ＭＰａ以上２０００ＭＰａ以下であることが好ましい。 Further, the coil spring 1 has a rigidity of 10 GPa or more and 50 GPa or less and / or a static torsional strength of 500 MPa from the viewpoint of improving the fatigue strength of the wire and ensuring the strength of the coil spring used for the suspension or the like. It is preferable that it is 2000 MPa or less.
　本実施の形態に係るコイルばね１は、芯材１０および強化繊維１２において、巻回する方向が、コイルばね１の中心軸Ｎ１に対して互いに反対方向である、例えば一方が＋４５°であれば他方が－４５°となるように、互いに交差している。芯材１０および強化繊維１２が互いに交差することで、強化繊維１２の巻付け方向Ｙ１が、引張り荷重の方向に沿った方向である場合、強化繊維１２に引張り荷重ＦTが加わった場合、上述したようにＦＲＰ層１１は縮径する方向の荷重が加わることとなるが、芯材１０は巻回方向が強化繊維１２と逆であるため、芯材１０が拡径する方向に変形しようとする。これにより、ＦＲＰ層１１の縮径を抑制することができる。 In the coil spring 1 according to the present embodiment, in the core material 10 and the reinforcing fiber 12, the winding direction is opposite to the central axis N1 of the coil spring 1, for example, if one is + 45 °. They cross each other so that the other is −45 °. If that core 10 and reinforcing fibers 12 intersect one another, winding direction Y1 of the reinforcing fibers 12, when a direction along the direction of the tensile load, the load F T tensile reinforcing fibers 12 is applied, above As described above, the load in the direction of reducing the diameter is applied to the FRP layer 11. However, since the winding direction of the core material 10 is opposite to that of the reinforcing fiber 12, the core material 10 tends to be deformed in the direction of increasing the diameter. . Thereby, the diameter reduction of the FRP layer 11 can be suppressed.
　図５は、コイルばね１を作製するための線材であるコイルばね用線材の構成を示す断面図である。同図に示すコイルばね用線材１００（以下、単に「線材１００」という）は、芯材１０と同じ材料からなり、帯状部材を巻回してなるスパイラルチューブである円柱状の芯材１１０と、強化繊維１２と同じ繊維からなる強化繊維１１２を芯材１１０の外周に巻き付けてなるＦＲＰ層１１１とを備えた２層構造の円柱状をなす。芯材１１０に巻き付ける強化繊維１１２は、予め液状の熱硬化性樹脂を含浸していてもよいし、各々巻き付けた後に熱硬化性樹脂を含浸してもよい。強化繊維１１２の巻回方向Ｙ１０（巻回角度θ）は、上述した巻付け方向Ｙ１と同じである。 FIG. 5 is a cross-sectional view showing a configuration of a coil spring wire that is a wire for producing the coil spring 1. A coil spring wire rod 100 (hereinafter, simply referred to as “wire rod 100”) shown in FIG. 1 is made of the same material as the core member 10 and has a cylindrical core member 110 that is a spiral tube formed by winding a belt-like member, and a reinforcing member. A cylindrical structure having a two-layer structure including an FRP layer 111 formed by winding reinforcing fibers 112 made of the same fibers as the fibers 12 around the outer periphery of the core material 110 is formed. The reinforcing fibers 112 wound around the core material 110 may be impregnated with a liquid thermosetting resin in advance, or may be impregnated with a thermosetting resin after each winding. The winding direction Y10 (winding angle θ) of the reinforcing fiber 112 is the same as the winding direction Y1 described above.
　続いて、本実施の形態に係る線材１００の製造方法について、図６および図７を参照して説明する。図６および図７は、本発明の一実施の形態に係るコイルばね用線材の製造方法を説明する図である。 Then, the manufacturing method of the wire 100 which concerns on this Embodiment is demonstrated with reference to FIG. 6 and FIG. 6 and 7 are views for explaining a method of manufacturing a coil spring wire according to an embodiment of the present invention.
　まず、芯材１１０について説明する。図６に示すように、芯材１１０は、帯状部材を巻回してなるスパイラルチューブである。芯材１１０は、長手方向（巻回の中心軸方向）に沿って形成される間隔が、ゼロ（密に巻回されたもの）か、帯状部材の幅より小さい。帯状部材同士の間隔は、芯材１０の強度を向上させるという観点で、帯状部材の幅より小さいことが好ましい。 First, the core material 110 will be described. As shown in FIG. 6, the core material 110 is a spiral tube formed by winding a belt-like member. In the core material 110, the interval formed along the longitudinal direction (direction of the central axis of the winding) is zero (thickly wound) or smaller than the width of the belt-shaped member. The distance between the band-shaped members is preferably smaller than the width of the band-shaped member from the viewpoint of improving the strength of the core member 10.
　また、芯材１１０には、外表面が熱硬化性樹脂との接着性を向上させるための表面処理が施されていることが、芯材１１０とＦＲＰ層１１１との接着性を向上させる点で好ましい。この表面処理としては、薬品やブラストなどの物理的な方法による表面処理、プライマーやカップリング剤などによる表面被覆処理、プラズマや紫外線などによる浄化、活性化処理などが挙げられる。 In addition, the core material 110 is subjected to a surface treatment for improving the adhesion with the thermosetting resin on the outer surface in terms of improving the adhesion between the core material 110 and the FRP layer 111. preferable. Examples of the surface treatment include surface treatment by a physical method such as chemicals or blasting, surface coating treatment by a primer or a coupling agent, purification by plasma or ultraviolet rays, activation treatment, and the like.
　また、芯材１１０には、残留応力を付与する処理が施されていることが、芯材１１０の強度を向上させる点で好ましい。この残留応力を付与する処理としては、ショットピーニング処理など、材料特性を変化させる処理としては、焼き入れ処理、焼き戻し処理などが挙げられる。 Further, it is preferable that the core material 110 is subjected to a treatment for applying a residual stress from the viewpoint of improving the strength of the core material 110. Examples of the process for imparting the residual stress include a quenching process and a tempering process as a process for changing material characteristics such as a shot peening process.
　その後、予め液状の熱硬化性樹脂を含浸した強化繊維１１２を芯材１１０に巻き付ける（図７参照）。この際、中心軸Ｎ１０に対する芯材１１０の巻回方向Ｙ２１と、強化繊維１１２の巻回方向Ｙ２２とは、互いに異なっており、中心軸Ｎ１０に対して互いに反対方向となっている。巻回方向Ｙ２１は、上述した巻回方向Ｙ１０と同じである。 Thereafter, the reinforcing fiber 112 previously impregnated with a liquid thermosetting resin is wound around the core 110 (see FIG. 7). At this time, the winding direction Y21 of the core 110 with respect to the central axis N10 and the winding direction Y22 of the reinforcing fibers 112 are different from each other and are opposite to each other with respect to the central axis N10. The winding direction Y21 is the same as the winding direction Y10 described above.
　強化繊維１１２を巻回後、この線材を、強化繊維１１２の熱硬化性樹脂が硬化する温度以上であって、芯材１１０および強化繊維１１２の融点より低い温度で加熱する。加熱により熱硬化性樹脂が硬化することによって、隣り合う強化繊維１１２同士が固着される。 After winding the reinforcing fiber 112, the wire is heated at a temperature higher than the temperature at which the thermosetting resin of the reinforcing fiber 112 is cured and lower than the melting point of the core material 110 and the reinforcing fiber 112. When the thermosetting resin is cured by heating, the adjacent reinforcing fibers 112 are fixed to each other.
　上述した処理によって、スパイラルチューブである芯材１１０と、複数の強化繊維１１２、および該強化繊維１１２同士を固着する熱硬化性樹脂とを含むＦＲＰ層１１１と、が形成され、図５に示す線材１００を得ることができる。 By the processing described above, the core material 110 that is a spiral tube, the FRP layer 111 including a plurality of reinforcing fibers 112 and a thermosetting resin that fixes the reinforcing fibers 112 to each other are formed, and the wire shown in FIG. 100 can be obtained.
　また、芯材１１０が螺旋状をなす中空の部材であるため、ＦＲＰ層１１１に取り込まれた気泡を線材の内側からも除去することが可能であり、線材の気孔率を低減して、強度低下を引き起こす気泡の残存を少なくすることができる。 Moreover, since the core material 110 is a hollow hollow member, it is possible to remove the air bubbles taken into the FRP layer 111 from the inside of the wire material, reducing the porosity of the wire material and reducing the strength. It is possible to reduce the remaining of the bubbles that cause
　なお、強化繊維１１２を芯材１１０に巻き付ける方法として、例えば、フィラメントワインディング（Filament　Winding）法が挙げられる。なお、複数の繊維がシート状をなしている繊維束を用いる場合は、シートワインディング（Sheet　Winding）法により形成することも可能といえる。 In addition, as a method of winding the reinforcing fiber 112 around the core material 110, for example, a filament winding method may be mentioned. In addition, when using the fiber bundle in which the some fiber has comprised the sheet form, it can also be formed by the sheet | seat winding (Sheet Winding) method.
　この線材１００をコイル形状に巻回することによって、上述したコイルばね１を作製することができる。この線材１００は、上述したコイルばね１のほか、片振りの荷重（上述した引張り荷重）が加わる弾性部材として使用することも可能である。 The coil spring 1 described above can be manufactured by winding the wire 100 into a coil shape. In addition to the coil spring 1 described above, the wire 100 can also be used as an elastic member to which a one-way swing (the above-described tensile load) is applied.
　以上説明した本発明の一実施の形態によれば、芯材１０とＦＲＰ層１１を備えたコイルばね１において、芯材１０が、帯状部材を巻回してなるスパイラルチューブであり、強化繊維１２が、芯材１０と交差するように巻回されるようにしたので、中空とすることで軽量化しつつ、強化繊維１２の巻回方向とは反対方向に巻回されてなる芯材１０によりコイルばね用線材の縮径によるＦＲＰ層１１のせん断破壊に対する強度を向上することができる。また、本実施の形態によれば、芯材１０を、帯状部材を巻回してなるスパイラルチューブとしたので、中実の棒材や、パイプと比して容易に屈曲させられるためにコイルばね１の成形性を向上させることができる。一方、中実金属芯であると、曲げにくいため成形しにくく、いったん塑性変形するとへたったままになってしまい、中空でも同様に、成形時に折れ曲がり、成形不良となってしまう。 According to the embodiment of the present invention described above, in the coil spring 1 including the core material 10 and the FRP layer 11, the core material 10 is a spiral tube formed by winding a belt-shaped member, and the reinforcing fibers 12 are provided. The coil spring is wound so as to intersect with the core material 10, so that the coil spring is wound by the core material 10 that is wound in the direction opposite to the winding direction of the reinforcing fiber 12 while reducing the weight by making it hollow. The strength against shear fracture of the FRP layer 11 due to the reduced diameter of the wire rod can be improved. In addition, according to the present embodiment, since the core member 10 is a spiral tube formed by winding a belt-like member, the coil spring 1 can be easily bent as compared with a solid bar member or a pipe. The moldability of can be improved. On the other hand, if it is a solid metal core, it is difficult to bend because it is difficult to bend, and once it is plastically deformed, it will remain slack, and even if it is hollow, it will be bent at the time of molding, resulting in poor molding.
（実施の形態の変形例）
　なお、ＦＲＰ層１１を形成する強化繊維１２がその一部でも導電性の繊維を含み、芯材１０が金属製である場合、芯材１０とＦＲＰ層１１との間に、絶縁性材料、例えば絶縁性のガラス繊維強化プラスチック（ＧＦＲＰ）層や、芯材１０の表面に形成した絶縁性の酸化被膜からなる電蝕防止層（電蝕防止部）を設けてもよい。図８は、本実施の形態の変形例に係るコイルばねの構成を示す模式図である。図８に示すコイルばね１ａは、芯材１０とＦＲＰ層１１との間に、絶縁性材料からなる電蝕防止層１３が設けられている。電蝕防止層１３は、例えば、絶縁性のＧＦＲＰ層、アルマイト層などの絶縁性の酸化被膜で形成される。電蝕防止層１３の厚さ（芯材１０の径方向の厚さ）は絶縁性が確保できればよく、例えばＧＦＲＰ層では０．１ｍｍ程度でも十分効果が得られる。電蝕防止層１３の形成により、芯材１０の電蝕による劣化を防止することができる。さらに、電蝕防止層１３の形成により防錆効果を得ることができる。 (Modification of the embodiment)
In addition, when the reinforcing fiber 12 forming the FRP layer 11 includes a part of the conductive fiber and the core material 10 is made of metal, an insulating material, for example, between the core material 10 and the FRP layer 11 is used. An insulating glass fiber reinforced plastic (GFRP) layer or an electrolytic corrosion preventing layer (electrolytic corrosion preventing portion) made of an insulating oxide film formed on the surface of the core member 10 may be provided. FIG. 8 is a schematic diagram showing a configuration of a coil spring according to a modification of the present embodiment. In the coil spring 1 a shown in FIG. 8, an electrolytic corrosion prevention layer 13 made of an insulating material is provided between the core material 10 and the FRP layer 11. The electrolytic corrosion prevention layer 13 is formed of an insulating oxide film such as an insulating GFRP layer or an alumite layer. The thickness of the electric corrosion prevention layer 13 (the thickness in the radial direction of the core material 10) may be sufficient if insulating properties can be ensured. For example, the GFRP layer has a sufficient effect even if it is about 0.1 mm. By forming the galvanic corrosion prevention layer 13, the core material 10 can be prevented from being deteriorated by galvanic corrosion. Further, the formation of the electrolytic corrosion prevention layer 13 can provide a rust prevention effect.
　以下、本発明に係るコイルばね用線材およびコイルばねの実施例について説明する。なお、本発明は、これらの実施例に限定されるものではない。まず、本実施例に係る試験内容について説明する。 Examples of the coil spring wire and coil spring according to the present invention will be described below. The present invention is not limited to these examples. First, the test content according to the present embodiment will be described.
（ねじり強度試験）
　特性測定用の線材にひずみゲージを貼付し、線材の中心軸のまわりの回転速度を０．３°／秒としてねじり試験を行った。本ねじり強度試験により、コイルばね用線材（炭素繊維）の静的ねじり強度を求めた。 (Torsion strength test)
A strain gauge was affixed to the wire for characteristic measurement, and a torsion test was conducted at a rotational speed around the central axis of the wire of 0.3 ° / second. The static torsional strength of the coil spring wire (carbon fiber) was determined by this torsional strength test.
（剛性率）
　上述したねじり強度試験により得られた応力－ひずみ線図の傾きをもとに、コイルばね用線材の剛性率を算出した。 (Rigidity)
Based on the slope of the stress-strain diagram obtained by the torsional strength test described above, the rigidity of the coil spring wire was calculated.
（気孔率）
　拡大鏡を用いてコイルばね用線材の断面を撮影し、ＦＲＰ層の気孔率を測定した。図９は、本発明の実施例に係る気孔率について説明する模式図である。図９に示すように、コイルばね用線材の芯材に近い側の層である内側層の内側気孔率として領域Ｒ3の気孔率を測定し、コイルばね用線材の外周側の層の外側気孔率として領域Ｒ4の気孔率を測定した。 (Porosity)
A cross section of the coil spring wire was photographed using a magnifying glass, and the porosity of the FRP layer was measured. FIG. 9 is a schematic diagram for explaining the porosity according to the embodiment of the present invention. As shown in FIG. 9, the porosity of the region R 3 is measured as the inner porosity of the inner layer, which is the layer closer to the core of the coil spring wire, and the outer pores of the outer layer of the coil spring wire are measured. As a rate, the porosity of the region R 4 was measured.
（コイリング性）
　コイルばね用線材のコイリング（巻回）のしやすさ、断面形状および巻径の安定性を以下のように評価した。
　　◎：容易にコイリングでき、かつ樹脂硬化／脱型後のコイルばね用線材の線材断面形状が一定
　　○：コイリング時に若干抵抗があり、かつ樹脂硬化／脱型後のコイルばね用線材の線材断面形状が一定
　　△：コイリング時に抵抗があり、かつ樹脂硬化／脱型後のコイルばね用線材の線材断面形状が一定
　　×：コイリング時に抵抗があり、かつ樹脂硬化／脱型後のコイルばね用線材の線材断面形状が変形または拡大 (Coiling)
The ease of coiling (winding), the cross-sectional shape and the stability of the winding diameter of the coil spring wire were evaluated as follows.
◎: Coiled easily, and the wire cross-sectional shape of the coil spring wire after resin curing / demolding is constant ○: Slight resistance during coiling, and the wire cross-sectional shape of the coil spring wire after resin curing / demolding △: There is resistance during coiling, and the wire cross-sectional shape of the coil spring wire after resin curing / demolding is constant. X: Wire resistance of the coil spring wire after coiling / resining and resin curing / demolding Cross-sectional shape is deformed or enlarged
（圧縮後のへたり評価）
　コイルばねの線材同士が密着するまで圧縮し、開放時に元の高さまで戻るかを確認することでへたり評価を行った。 (Sagging evaluation after compression)
The coil springs were compressed until they were brought into close contact with each other, and evaluation was made by checking whether the coil springs returned to their original height when opened.
　続いて、本実施例に係るコイルばね用線材の製造方法および構成について説明する。 Subsequently, the manufacturing method and configuration of the coil spring wire according to the present embodiment will be described.
（実施例１）
　マンドレルとして、厚さが１ｍｍの硬鋼線を、長手方向に沿って巻いて外径φ７ｍｍのスパイラルチューブを作製した。この硬鋼線は、φ３ｍｍの硬鋼線材を圧延して厚さを１ｍｍとしたものを用いた。この際、スパイラルチューブの巻回の中心軸と巻回方向とのなす角度は約－７０°とした。これを長さ３０００ｍｍに切断し実施例１の芯材とした。 Example 1
As a mandrel, a hard steel wire having a thickness of 1 mm was wound along the longitudinal direction to produce a spiral tube having an outer diameter of φ7 mm. As the hard steel wire, a hard steel wire with a diameter of 3 mm was rolled to a thickness of 1 mm. At this time, the angle formed between the winding central axis of the spiral tube and the winding direction was about -70 °. This was cut into a length of 3000 mm to obtain a core material of Example 1.
　次に、この芯材に対しＦＲＰ層を形成した。具体的には、熱硬化性樹脂であるエポキシ樹脂と、架橋剤との混合液を含浸させた炭素繊維の繊維束を、繊維束の延伸方向が芯材の長手方向に対して＋４５°をなす状態を維持しながら、芯材の一方の端部から他方の端部まで隙間なく巻き付けていき、コイルばね用線材として外径が均一な約φ１８ｍｍの未硬化の炭素繊維強化プラスチック（ＣＦＲＰ）線材を成形した。次にφ１８ｍｍのコイルばね用線材を螺旋状に溝がほられた型に巻回してコイルばねを成形した。また、これとは別に、特性測定用の線材として外径約φ１４ｍｍの未硬化のＣＦＲＰ線材を成形した。その後、オーブンで線材に引張り荷重≒５００グラムを加えながら１００°で加熱した後１５０°で加熱硬化させた。これにより本実施例１のコイルばねと特性測定用のコイルばね用線材を得た。表１に、実施例１に係るコイルばねと特性測定用の線材との構成および試験結果を示す。なお、ねじり強度試験、剛性率、気孔率（内側、外側）は、φ１４ｍｍの特性測定用のコイルばね用線材を用いて測定を行った。
Figure JPOXMLDOC01-appb-T000001
 Next, an FRP layer was formed on the core material. Specifically, a fiber bundle of carbon fibers impregnated with a mixed solution of an epoxy resin, which is a thermosetting resin, and a crosslinking agent, the fiber bundle stretching direction is + 45 ° with respect to the longitudinal direction of the core material. While maintaining the state, the core material is wound without gaps from one end to the other, and an uncured carbon fiber reinforced plastic (CFRP) wire having a uniform outer diameter of about 18 mm is used as a wire for a coil spring. Molded. Next, a coil spring was formed by winding a wire rod for a coil spring of φ18 mm around a spirally grooved mold. Separately, an uncured CFRP wire having an outer diameter of about 14 mm was formed as a wire for measuring characteristics. Thereafter, the wire was heated at 100 ° while applying a tensile load ≈500 grams to the wire in an oven and then cured by heating at 150 °. Thus, the coil spring of Example 1 and a coil spring wire for characteristic measurement were obtained. Table 1 shows the configuration and test results of the coil spring and the wire for characteristic measurement according to Example 1. The torsional strength test, rigidity, and porosity (inside and outside) were measured using a coil spring wire for measuring the characteristics of φ14 mm.
Figure JPOXMLDOC01-appb-T000001
（実施例２）
　スパイラルチューブの巻回の中心軸と巻回方向とのなす角度を約－５０°とした以外は実施例１と同様にして実施例２のコイルばね用線材を得た。表１に、実施例２に係るコイルばね用線材の構成および試験結果を示す。 (Example 2)
A wire material for a coil spring of Example 2 was obtained in the same manner as in Example 1 except that the angle formed between the central axis of winding of the spiral tube and the winding direction was about −50 °. Table 1 shows the configuration and test results of the coil spring wire according to Example 2.
（実施例３）
　ＦＲＰ層の熱硬化性樹脂であるエポキシ樹脂に代えて熱可塑性樹脂であるポリプロピレン樹脂とし、コイルばね用線材を螺旋状に溝がほられた型に巻回してコイルばねを成形する際にコイルばね用線材は予め樹脂が軟化する温度を一定の温度（約１５０℃）にして加熱した以外は実施例１と同様にして実施例３のコイルばね用線材を得た。表１に、実施例３に係るコイルばね用線材の構成および試験結果を示す。 (Example 3)
A coil spring is formed when a coil spring is formed by winding a coil spring wire rod around a spirally grooved mold in place of an epoxy resin which is a thermosetting resin of the FRP layer instead of a thermoplastic resin. The wire for the coil spring of Example 3 was obtained in the same manner as in Example 1 except that the wire was heated in advance at a temperature at which the resin was softened at a constant temperature (about 150 ° C.). Table 1 shows the configuration and test results of the coil spring wire according to Example 3.
（実施例４）
　ＦＲＰ層の熱硬化性樹脂であるエポキシ樹脂に代えて熱可塑性樹脂であるポリプロピレン樹脂とし、コイルばね用線材を螺旋状に溝がほられた型に巻回してコイルばねを成形する際にコイルばね用線材は予め樹脂が軟化する温度を一定の温度（約１５０℃）にして加熱した以外は実施例２と同様にして実施例４のコイルばね用線材を得た。表１に、実施例４に係るコイルばね用線材の構成および試験結果を示す。 Example 4
A coil spring is formed when a coil spring is formed by winding a coil spring wire rod around a spirally grooved mold in place of an epoxy resin which is a thermosetting resin of the FRP layer instead of a thermoplastic resin. The wire for the coil spring of Example 4 was obtained in the same manner as in Example 2 except that the wire was heated in advance at a temperature at which the resin was softened at a constant temperature (about 150 ° C.). Table 1 shows the configuration and test results of the coil spring wire according to Example 4.
（実施例５）
　フィラメントワインディング機に取り付けるマンドレルとして、厚さが１ｍｍの炭素強化繊維プラスチック（ＣＦＲＰ）を、長手方向に沿って巻いてなる外径φ７ｍｍのスパイラルチューブを作製し、長さ３０００ｍｍに切断して芯材とした以外は実施例１と同様にして実施例５のコイルばね用線材を得た。この際、スパイラルチューブの巻回の中心軸と巻回方向とのなす角度は約－６０°とした。表１に、実施例５に係るコイルばね用線材の構成および試験結果を示す。 (Example 5)
As a mandrel to be attached to a filament winding machine, a spiral tube with an outer diameter of φ7 mm is prepared by winding a carbon reinforced fiber plastic (CFRP) with a thickness of 1 mm along the longitudinal direction, and cut into a length of 3000 mm to obtain a core material. A coil spring wire of Example 5 was obtained in the same manner as Example 1 except that. At this time, the angle formed by the winding axis of the spiral tube and the winding direction was about −60 °. Table 1 shows the configuration and test results of the coil spring wire according to Example 5.
（実施例６）
　実施例５で作製したコイルばね用線材に対し、内部に異物侵入防止用にポリプロピレン（ＰＰ）製の樹脂芯を挿入して実施例６のコイルばね用線材を得た。表１に、実施例６に係るコイルばね用線材の構成および試験結果を示す。 (Example 6)
The coil spring wire of Example 6 was obtained by inserting a polypropylene (PP) resin core into the coil spring wire prepared in Example 5 to prevent foreign material from entering the coil spring. Table 1 shows the configuration and test results of the coil spring wire according to Example 6.
（比較例１）
　マンドレルとして外径φ７ｍｍの５０００系アルミニウム材料製の丸棒を芯材として用いた。その他の条件は、実施例１と同様にして、比較例１のコイルばね用線材を得た。表１に、比較例１に係るコイルばね用線材の構成および特性を示す。 (Comparative Example 1)
A round bar made of a 5000 series aluminum material having an outer diameter of 7 mm was used as a mandrel as a core material. Other conditions were the same as in Example 1, and the wire for a coil spring of Comparative Example 1 was obtained. Table 1 shows the configuration and characteristics of the coil spring wire according to Comparative Example 1.
（比較例２）
　マンドレルとして外径φ７ｍｍの純アルミニウム材料製の丸棒を芯材として用いた。その他の条件は、実施例１と同様にして、比較例２のコイルばね用線材を得た。表１に、比較例２に係るコイルばね用線材の構成および特性を示す。 (Comparative Example 2)
A round bar made of a pure aluminum material having an outer diameter of 7 mm was used as a mandrel as a core material. Other conditions were the same as in Example 1, and the wire for a coil spring of Comparative Example 2 was obtained. Table 1 shows the configuration and characteristics of the coil spring wire according to Comparative Example 2.
（比較例３）
　マンドレルとして外径φ７ｍｍの５０００系アルミニウム材料製の丸棒を芯材として用いた。その他の条件は、実施例３と同様にして、比較例３のコイルばね用線材を得た。表１に、比較例３に係るコイルばね用線材の構成および特性を示す。 (Comparative Example 3)
A round bar made of a 5000 series aluminum material having an outer diameter of 7 mm was used as a mandrel as a core material. Other conditions were the same as in Example 3, and the wire for a coil spring of Comparative Example 3 was obtained. Table 1 shows the configuration and characteristics of the coil spring wire according to Comparative Example 3.
（比較例４）
　マンドレルとして外径φ７ｍｍの純アルミニウム材料製の丸棒を芯材として用いた。その他の条件は、実施例４と同様にして、比較例４のコイルばね用線材を得た。表１に、比較例４に係るコイルばね用線材の構成および特性を示す。 (Comparative Example 4)
A round bar made of a pure aluminum material having an outer diameter of 7 mm was used as a mandrel as a core material. Other conditions were the same as in Example 4, and the wire for a coil spring of Comparative Example 4 was obtained. Table 1 shows the configuration and characteristics of the coil spring wire according to Comparative Example 4.
（比較例５）
　マンドレルとして外径φ７ｍｍ、厚さ１ｍｍの筒状の純アルミニウム材料製のパイプを芯材として用いた。その他の条件は、実施例１と同様にして、比較例５のコイルばね用線材を得た。表１に、比較例５に係るコイルばね用線材の構成および特性を示す。 (Comparative Example 5)
A cylindrical pipe made of pure aluminum material having an outer diameter of 7 mm and a thickness of 1 mm was used as a mandrel as a core material. Other conditions were the same as in Example 1, and the wire for a coil spring of Comparative Example 5 was obtained. Table 1 shows the configuration and characteristics of the coil spring wire according to Comparative Example 5.
（比較例６）
　マンドレルとして外径φ７ｍｍのポリプロピレン（ＰＰ）製の丸棒を芯材として用いた。その他の条件は、実施例１と同様にして、比較例６のコイルばね用線材を得た。表１に、比較例６に係るコイルばね用線材の構成および特性を示す。 (Comparative Example 6)
A round bar made of polypropylene (PP) having an outer diameter of 7 mm was used as a mandrel as a core material. Other conditions were the same as in Example 1, and the wire for a coil spring of Comparative Example 6 was obtained. Table 1 shows the configuration and characteristics of the coil spring wire according to Comparative Example 6.
（比較例７）
　マンドレルとして外径φ７ｍｍ、厚さ１ｍｍの筒状のポリプロピレン（ＰＰ）製のパイプを芯材として用いた。その他の条件は、実施例１と同様にして、比較例７のコイルばね用線材を得た。表１に、比較例７に係るコイルばね用線材の構成および特性を示す。 (Comparative Example 7)
A cylindrical polypropylene (PP) pipe having an outer diameter of 7 mm and a thickness of 1 mm was used as a mandrel as a core material. Other conditions were the same as in Example 1, and the wire for a coil spring of Comparative Example 7 was obtained. Table 1 shows the configuration and characteristics of the coil spring wire according to Comparative Example 7.
　次に、本実施例に係るコイルばね用線材の特性について説明する。実施例１～４に係るコイルばね用線材は、アルミニウム材料からなる丸棒を芯材としたもの（比較例１～４）と比して、ねじり強度および剛性率がそれぞれほぼ同等であり、線材として高強度であるといえる。また、コイリング性は良好で容易に巻回が可能で、アルミニウム材料製の丸棒を用いた比較例１～４の線材は変形しにくく巻回が困難であった。一方、ＰＰ丸棒を芯材とした比較例６のコイリング性は良好であるが線材の剛性率及びねじり強度は低い値を示した。また、パイプ状の芯を用いたもの（比較例５，７）はコイリング時に線材が折れ曲がり整形不良となった。さらに、実施例１～６の気孔率は、内側気孔率、外側気孔率ともに比較例１～４，６よりも低く、スパイラルチューブを芯材として用いることで、気泡の残存を低減することができた。 Next, the characteristics of the coil spring wire according to this embodiment will be described. The wire rods for coil springs according to Examples 1 to 4 have substantially the same torsional strength and rigidity as compared with those using a round bar made of an aluminum material as a core (Comparative Examples 1 to 4). It can be said that the strength is high. Further, the coiling property was good and the wire could be easily wound. The wires of Comparative Examples 1 to 4 using a round bar made of an aluminum material were difficult to deform and difficult to wind. On the other hand, the coiling property of Comparative Example 6 using a PP round bar as a core was good, but the rigidity and torsional strength of the wire were low. Further, in the case of using a pipe-shaped core (Comparative Examples 5 and 7), the wire was bent during coiling, resulting in poor shaping. Furthermore, the porosity of Examples 1 to 6 is lower than that of Comparative Examples 1 to 4 and 6 for both the inner and outer porosity, and the use of a spiral tube as the core material can reduce the remaining of bubbles. It was.
　このように、本発明はここでは記載していない様々な実施の形態等を含みうるものであり、請求の範囲により特定される技術的思想を逸脱しない範囲内において種々の設計変更等を施すことが可能である。 As described above, the present invention can include various embodiments not described herein, and various design changes and the like can be made without departing from the technical idea specified by the claims. Is possible.
　以上のように、本発明に係るコイルばね用線材およびコイルばねは、軽量化しつつ、強度を向上するのに好適である。 As described above, the wire for a coil spring and the coil spring according to the present invention are suitable for improving the strength while reducing the weight.
　１　コイルばね
　１０　芯材
　１１　繊維強化プラスチック（ＦＲＰ）層
　１２　強化繊維
　１３　電蝕防止層
　１００　コイルばね用線材 DESCRIPTION OF SYMBOLS 1 Coil spring 10 Core material 11 Fiber reinforced plastic (FRP) layer 12 Reinforcement fiber 13 Electric corrosion prevention layer 100 Wire material for coil springs

Claims (14)

  1. 　コイルばねを作製するためのコイルばね用線材であって、
    　長尺の部材を用いて形成された螺旋状をなす芯材と、
    　前記芯材に巻回してなる強化繊維を有し、前記芯材の外表面を覆うＦＲＰ層と、
    　を備え、
    　前記芯材および前記強化繊維は、巻回する方向が、当該コイルばね用線材の中心軸に対して互いに反対方向である
    　ことを特徴とするコイルばね用線材。     A coil spring wire for producing a coil spring,
    A spiral core formed using a long member;
    Having a reinforcing fiber wound around the core material, and an FRP layer covering the outer surface of the core material;
    With
    A coil spring wire, wherein the core material and the reinforcing fiber are wound in directions opposite to each other with respect to a central axis of the coil spring wire.
  2. 　前記強化繊維は、少なくとも外表面の前記強化繊維の前記芯材に対して巻回する方向が、外部から加わる荷重であって当該コイルばね用線材にねじり応力を加える荷重に応じて当該コイルばね用線材に印加される引張り荷重の方向に沿った方向である
    　ことを特徴とする請求項１に記載のコイルばね用線材。     The reinforcing fiber is used for the coil spring according to a load applied from the outside in a direction in which at least the reinforcing fiber on the outer surface is wound around the core material and applying a torsional stress to the coil spring wire. It is a direction along the direction of the tensile load applied to a wire, The wire for coil springs of Claim 1 characterized by the above-mentioned.
  3. 　前記芯材は、巻回の中心軸と巻回方向とのなす角度が一定である
    　ことを特徴とする請求項１または２に記載のコイルばね用線材。     The wire material for a coil spring according to claim 1 or 2, wherein the core member has a constant angle between a winding central axis and a winding direction.
  4. 　前記芯材は、帯状部材を螺旋状に巻回してなり、
    　長手方向に沿って形成される間隔が、前記帯状部材の幅より小さい
    　ことを特徴とする請求項１～３のいずれか一つに記載のコイルばね用線材。     The core material is formed by spirally winding a band-shaped member,
    The wire for a coil spring according to any one of claims 1 to 3, wherein an interval formed along the longitudinal direction is smaller than a width of the strip-shaped member.
  5. 　前記芯材は、鉄鋼材、またはアルミニウム、マグネシウムもしくはチタンを主成分とする合金、またはＦＲＰを用いて形成されている
    　ことを特徴とする請求項１～４のいずれか一つに記載のコイルばね用線材。     The coil spring according to any one of claims 1 to 4, wherein the core material is formed using a steel material, an alloy mainly composed of aluminum, magnesium or titanium, or FRP. Wire rod.
  6. 　前記長尺の部材を用いて形成された芯材は、該芯材の長手方向からみた外周のなす形状が矩形、円、楕円状または多角形状をなす
    　ことを特徴とする請求項１～５のいずれか一つに記載のコイルばね用線材。     The core material formed using the long member has a rectangular shape, a circular shape, an elliptical shape, or a polygonal shape formed by the outer periphery of the core material as viewed from the longitudinal direction. The wire material for coil springs as described in any one.
  7. 　前記長尺の部材は、長手方向と直交する断面が矩形、円、楕円状または多角形状をなす
    　ことを特徴とする請求項１～６のいずれか一つに記載のコイルばね用線材。     The coil spring wire according to any one of claims 1 to 6, wherein the elongated member has a rectangular, circular, elliptical, or polygonal cross section perpendicular to the longitudinal direction.
  8. 　樹脂を主成分とし、前記芯材の内部に設けられてなる充填材を備えたことを特徴とする請求項１～７のいずれか一つに記載のコイルばね用線材。 The coil spring wire according to any one of claims 1 to 7, further comprising a filler comprising resin as a main component and provided inside the core member.
  9. 　絶縁性材料を用いて形成され、前記芯材と前記強化繊維との間に設けられた電蝕防止部
    　を備えたことを特徴とする請求項１～８のいずれか一つに記載のコイルばね用線材。     The coil spring according to any one of claims 1 to 8, further comprising an electrolytic corrosion prevention portion that is formed using an insulating material and is provided between the core material and the reinforcing fiber. Wire rod.
  10. 　前記ＦＲＰ層は、前記強化繊維同士を固定する熱硬化性樹脂を含み、
    　前記芯材は、外表面に前記熱硬化性樹脂との接着性を向上させる表面処理が施されている
    　ことを特徴とする請求項１～９のいずれか一つに記載のコイルばね用線材。     The FRP layer includes a thermosetting resin that fixes the reinforcing fibers,
    The wire material for a coil spring according to any one of claims 1 to 9, wherein the core material is subjected to a surface treatment for improving adhesion to the thermosetting resin on an outer surface.
  11. 　前記強化繊維は、前記芯材に対する周回方向に沿って連続している
    　ことを特徴とする請求項１～１０のいずれか一つに記載のコイルばね用線材。     The coil spring wire according to any one of claims 1 to 10, wherein the reinforcing fibers are continuous along a circumferential direction with respect to the core member.
  12. 　請求項１～１１のいずれか一つに記載のコイルばね用線材を巻回してなることを特徴とするコイルばね。 A coil spring obtained by winding the coil spring wire according to any one of claims 1 to 11.
  13. 　圧縮コイルばねであることを特徴とする請求項１２に記載のコイルばね。 The coil spring according to claim 12, wherein the coil spring is a compression coil spring.
  14. 　自動車用の懸架ばねであることを特徴とする請求項１２に記載のコイルばね。 The coil spring according to claim 12, which is a suspension spring for an automobile.
PCT/JP2016/082173 2015-10-29 2016-10-28 Coil spring wire rod and coil spring WO2017073772A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015213502A JP2017082967A (en) 2015-10-29 2015-10-29 Wire for coil spring and coil spring
JP2015-213502 2015-10-29

Publications (1)

Publication Number Publication Date
WO2017073772A1 true WO2017073772A1 (en) 2017-05-04

Family

ID=58630424

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/082173 WO2017073772A1 (en) 2015-10-29 2016-10-28 Coil spring wire rod and coil spring

Country Status (2)

Country Link
JP (1) JP2017082967A (en)
WO (1) WO2017073772A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107322948A (en) * 2017-08-11 2017-11-07 南京诺尔泰复合材料设备制造有限公司 A kind of spiral forming device and method of work suitable for continuous fiber composite material

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102198668B1 (en) * 2019-11-01 2021-01-05 주식회사 현대폴리텍 Method for manufacturing composite coil springs and the composite coil springs thereof
CN111331877B (en) * 2020-02-17 2022-05-17 浙江理工大学 Preparation method of variable-stiffness composite material spiral spring

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4473217A (en) * 1982-01-07 1984-09-25 Kato Hatsujo Kaisha, Limited Fiber-reinforced resin coil spring and method of manufacturing the same
JPH01269736A (en) * 1988-04-22 1989-10-27 Mitsubishi Heavy Ind Ltd Helical spring
JPH0319140U (en) * 1979-07-12 1991-02-25
JPH0742778A (en) * 1993-08-04 1995-02-10 Toho Rayon Co Ltd Carbon fiber reinforced plastic coil spring

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0319140U (en) * 1979-07-12 1991-02-25
US4473217A (en) * 1982-01-07 1984-09-25 Kato Hatsujo Kaisha, Limited Fiber-reinforced resin coil spring and method of manufacturing the same
JPH01269736A (en) * 1988-04-22 1989-10-27 Mitsubishi Heavy Ind Ltd Helical spring
JPH0742778A (en) * 1993-08-04 1995-02-10 Toho Rayon Co Ltd Carbon fiber reinforced plastic coil spring

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107322948A (en) * 2017-08-11 2017-11-07 南京诺尔泰复合材料设备制造有限公司 A kind of spiral forming device and method of work suitable for continuous fiber composite material
CN107322948B (en) * 2017-08-11 2023-09-29 南京诺尔泰复合材料设备制造有限公司 Spiral forming device suitable for continuous fiber composite material and working method

Also Published As

Publication number Publication date
JP2017082967A (en) 2017-05-18

Similar Documents

Publication Publication Date Title
US10240654B2 (en) Hybrid spring device
US7857294B2 (en) Composite springs and methods of manufacture
US6612556B2 (en) Multihelical composite spring
US9982734B2 (en) Composite coil spring
US20170274603A1 (en) Fiber-reinforced member and method for manufacturing same
WO2010084809A1 (en) Method for producing frp cylinder and frp cylinder
JP6440847B2 (en) Wire for elastic member and elastic member
WO2017073772A1 (en) Coil spring wire rod and coil spring
KR102640878B1 (en) Coil spring and its manufacturing method
EP3017226B1 (en) Hose with optimised steel wire reinforcement layers
JPH0258493B2 (en)
WO2017163860A1 (en) Coil spring
WO2017073771A1 (en) Wire rod for elastic member, and elastic member
GB2280889A (en) Hollow elongated or tubular bodies and their manufacture
CN108350968B (en) Wire material for elastic member and elastic member
US20070235913A1 (en) Methods and manufacturing of a composite shock-absorbing structure thereof
JP6922393B2 (en) Pressure vessel
US20190366617A1 (en) Strand profile and process for producing a strand profile
JPS5828029A (en) Fiber reinforced plastic coil spring and its manufacture
KR101704038B1 (en) Propeller shaft for vehicle and manufacturing method thereof
WO2017043654A1 (en) Method for producing wire rod for elastic members, wire rod for elastic members, and elastic member

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16860000

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16860000

Country of ref document: EP

Kind code of ref document: A1