JP2016037061A - Vehicular wheel - Google Patents

Abstract

Even when a lightweight member is used, it is possible to obtain excellent mechanical strength characteristics without causing separation or rapid breakage between members, and to achieve both weight reduction and designability. Provide a possible vehicle wheel. A metal wheel base portion (wheel base portion (A)) in which a wheel fixing portion and a rim portion are connected by a spoke body constituting a disc portion, and a disc reinforcing member made of fiber reinforced resin. 3 (disc reinforcing member (B)) is bonded through an adhesive (C) having a tensile elongation at break of 1% or more. [Selection] Figure 1

Description

  The present invention relates to a vehicle wheel used for mounting a tire on an automobile.

  In general, a vehicle wheel for mounting a tire for an automobile is made of steel or a light metal alloy such as aluminum or magnesium. In recent years, with increasing interest in environmental issues, attention has been focused on improving fuel economy by reducing the weight of automobiles. Vehicle wheels manufactured using lighter aluminum alloys are the mainstream. It has become. As such a vehicle wheel, for example, a vehicle wheel 200 shown in FIG. 6 is made of a light metal alloy, and the wheel fixing portion 201 and the rim portion 203 are connected by a disk portion made of a spoke body 202. Things. The vehicle wheel 200 is formed in a plurality such that the spokes 202 of the disk portion extend radially in the radial direction, and a window 202D is formed between the spokes 202.

  Recently, for the purpose of further promoting the weight reduction of vehicle wheels, development of vehicle wheels using lighter materials has been studied, for example, FRP skins on both sides of a low density core material. There has been proposed a vehicle wheel having a structure in which a disc integrated with a rim is joined to a rim with a bolt (see, for example, Patent Document 1). However, in the configuration of the vehicle wheel described in Patent Document 1, when the metal rim and the disk integrated with the FRP skin are joined with only the bolt, the wheel temperature is changed by the heat generated from the brake. However, there is a problem that the bolt is loosened due to the difference in the thermal expansion coefficient of each member.

  In addition, for example, a vehicle wheel is proposed in which at least one of a wheel including a disk portion and a rim portion is formed as a laminated integrated structure of FRP (Fiber Reinforced Plastics) and metal (for example, , See Patent Document 2). However, when the FRP and the metal are integrally formed as in the vehicle wheel described in Patent Document 2, there is a problem in that peeling is likely to occur because the joint strength cannot be sufficiently obtained.

  On the other hand, recently, a vehicle wheel in which almost the entire wheel is made of FRP has also been proposed, and a part of the wheel has already been commercialized. However, when almost the entire vehicle wheel is made of FRP, it requires a huge number of man-hours for molding, increases the size of the mold, and significantly increases the manufacturing cost.

JP 59-195403 A JP-A-63-134302

  The present invention has been made in view of the above circumstances, and even when a lightweight member is used, exfoliation or rapid breakage between members does not occur, and excellent mechanical strength characteristics are obtained. An object of the present invention is to provide a vehicle wheel capable of achieving both weight reduction and design.

As a result of intensive studies in order to achieve the above object, the present inventors have found that a metal wheel base and a disk reinforcing member made of a fiber reinforced resin have an adhesive having a tensile elongation at break of 1% or more. The wheel base and the disk reinforcing member are firmly bonded to each other, and the mechanical strength of the entire wheel is improved, thereby reducing the weight of the metal wheel base. However, it has been found that it is possible to maintain the excellent mechanical strength characteristics of the entire wheel without causing abrupt destruction. Furthermore, as the wheel base can be reduced in weight, the design freedom in design is also improved, and it has been found that the entire wheel can also have excellent design properties, and the present invention has been completed. I came to let you.
That is, this invention includes the following aspects.

[1] A metal wheel base (A) in which a wheel fixing part and a rim part are connected by a disk part, and a disk reinforcing member (B) made of a fiber reinforced resin have a tensile elongation at break of 1% or more. A vehicle wheel that is bonded via an adhesive (C).
[2] The vehicle wheel according to [1], wherein the adhesive (C) has a tensile modulus of 200 to 2000 MPa.
[3] The vehicle according to [1] or [2], wherein an anodized film (D) is formed on at least a surface of the wheel base (A) to be bonded to the disk reinforcing member (B). wheel.
[4] In any one of the above [1] to [3], the surface to be bonded to the disk reinforcing member (B) of the wheel base (A) is treated with a primer (E). The vehicle wheel described.
[5] The vehicle wheel according to any one of [1] to [4], wherein the adhesive (C) is an acrylic adhesive.
[6] The disk portion of the wheel base portion (A) has a shape in which a plurality of spoke bodies extend radially from the wheel fixing portion toward the rim portion, and the disk reinforcing member (B) Is formed such that the center portion and the outer peripheral portion are connected by the disc portion so as to correspond to the wheel fixing portion, the rim portion and the disc portion provided in the wheel base portion (A), The disk portion provided in the disk reinforcing member (B) is formed in a spoke-like shape extending radially so as to correspond to the spoke body forming the disk portion of the wheel base (A). The vehicle wheel according to any one of [1] to [5] above.
[7] The spoke body forming the disk portion of the wheel base (A) has an edge portion with respect to the wheel fixing portion, an edge portion with respect to window portions on both sides of the spoke body, and an edge portion with respect to the rim portion. The vehicle wheel according to the above [6], which has a shape that is left as a thick part and is thinned.
[8] A plurality of the disk portions provided in the disk reinforcing member (B) are radially extended and formed in a spoke shape so that the respective disk portions of the wheel base (A) form the disk portions. The vehicle according to [6], wherein the vehicle is disposed so as to correspond to a shape in which two adjacent spoke bodies and a space portion of the disk portion between the two adjacent spoke bodies are combined. Wheel.

  According to the vehicle wheel of the present invention, as described above, the metal wheel base (A) and the disk reinforcing member (B) made of fiber reinforced resin have an adhesive having a tensile elongation at break of 1% or more. By adopting the structure bonded via (C), the wheel base (A) and the disk reinforcing member (B) are firmly bonded, and the strength of the entire wheel is improved. It does not occur and excellent mechanical strength characteristics can be obtained. Moreover, even when the metal volume of the metal wheel base (A) is reduced, the high mechanical strength characteristics of the entire wheel can be maintained, so that the weight can be effectively reduced. Furthermore, as the weight can be reduced, the design freedom on the design surface is also improved, so that the entire wheel can be given excellent design properties. Therefore, it is possible to provide a vehicle wheel that is excellent in mechanical strength characteristics and can achieve both weight reduction and design.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which illustrates typically the vehicle wheel which is the 1st Embodiment of this invention, Fig.1 (a) is a perspective view which shows the vehicle wheel whole, FIG.1 (b) is a wheel base part and a disk reinforcement member. FIG. 1C is a perspective view showing the wheel base as a single unit. FIG. 2 is a diagram schematically illustrating a vehicle wheel according to a second embodiment of the present invention, in which FIG. 2A is a perspective view showing the entire vehicle wheel, and FIG. 2B is a wheel base and a disk reinforcing member. It is an assembly perspective view which shows the procedure which adhere | attaches. FIGS. 3A and 3B are diagrams schematically illustrating a vehicle wheel according to a third embodiment of the present invention, FIG. 3A is a perspective view showing the entire vehicle wheel, and FIG. 3B is a wheel base and a disk reinforcing member. It is an assembly perspective view which shows the procedure which adhere | attaches. FIG. 4 is a diagram schematically illustrating a vehicle wheel according to a fourth embodiment of the present invention, in which FIG. 4A is a perspective view showing the entire vehicle wheel, and FIG. 4B is a wheel base and a disk reinforcing member. It is an assembly perspective view which shows the procedure which adhere | attaches. FIG. 5 is a diagram schematically illustrating a vehicle wheel according to a fifth embodiment of the present invention, in which FIG. 5A is a perspective view showing the entire vehicle wheel, and FIG. 5B is a wheel base and a disk reinforcing member. It is an assembly perspective view which shows the procedure which adhere | attaches. It is a perspective view which shows the conventional vehicle wheel.

  Hereinafter, the vehicle wheel of the present invention will be described in detail with reference to FIGS. In addition, each drawing used in the following description may show the characteristic part in an enlarged manner for convenience in order to make the feature easy to understand, and the dimensional ratio of each component is different from the actual case. There is. In addition, the materials, dimensions, and the like exemplified in the following description are examples, and the present invention is not limited to them, and can be appropriately changed and implemented without changing the gist thereof.

<First Embodiment>
A vehicle wheel 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1A to 1C as appropriate (some will be described with reference to the conventional diagram of FIG. 6 as appropriate). Here, FIG. 1A is a perspective view showing the entire vehicle wheel 1 of the present embodiment, and FIG. 1B is an assembled perspective view showing a procedure for bonding the wheel base 2 and the disk reinforcing member 3. FIG.1 (c) is a perspective view which shows the wheel base 2 alone.

  As shown in FIGS. 1A to 1C, the vehicle wheel 1 according to this embodiment is made of a metal in which a wheel fixing portion 21 and a rim portion 23 are connected by a spoke body 22 constituting a disc portion. An unillustrated adhesive (C) in which the wheel base (wheel base (A)) 2 and the disk reinforcing member (disk reinforcing member (B)) 3 made of fiber reinforced resin have a tensile elongation at break of 1% or more. It is set as the structure adhere | attached through this.

[Vehicle wheel structure]
First, the structure of the vehicle wheel 1 of the present embodiment will be described.
As shown in the illustrated example, the vehicle wheel 1 has a disk reinforcing member 3 attached only to the front side surface 2A side of the wheel base 2 that is disposed on the outside of the vehicle when attached to a vehicle (not shown). In addition, the disc reinforcing member 3 is not attached to the back side surface 2B side disposed on the inner side when viewed from the vehicle.
Further, the vehicle wheel 1 in the illustrated example is provided with a total of five hub bolt holes 25 and is generally used in a vehicle having a relatively high engine output.

  The wheel base 2 is provided as a base in the vehicle wheel 1 of the present embodiment. As shown in FIG. 1 (c), the wheel base 2 is attached to the axle at the center when the wheel base 2 is viewed from the front side. A portion 21 is provided, and a hub hole 26 is formed at the center thereof. Further, in the illustrated wheel base portion 2, a disk portion provided between the wheel fixing portion 21 and a rim portion 23 on which a not-shown tire is mounted is formed between the spoke body 22 and the spoke body 22. The window portion 22D is provided. Each spoke body 22 has a thick portion 22A and a thick portion 22B at the edges with respect to the window portion 22D on both sides, and a part of the portion between the thick portion 22A and the thick portion 22B. Is formed as a thinned portion 22C.

  The wheel fixing portion 21 is provided with the hub bolt hole portions 25 described above at a total of five locations at equal intervals so as to surround the hub hole 26. Furthermore, screw holes 24 for screwing the disk reinforcing member 3 with the mounting screws 4 are arranged in the wheel fixing portion 21 at a total of five locations at equal intervals so as to surround the hub hole 26.

  Further, the wheel base 2 in the example shown in FIGS. 1A to 1C has a disk portion in which a plurality of spoke bodies 22 are radially extended from the wheel fixing portion 21 toward the rim portion 23. ing. The spoke body 22 is an elongated portion provided at a total of five locations, and the rim portion 23 on the radial side is formed radially between each of the five hub bolt hole portions 25 formed in the wheel fixing portion 21. It is extended toward. That is, in the illustrated example, the hub bolt hole portions 25 are provided at five locations, and one spoke body 22 is arranged so as to correspond between each of the hub bolt hole portions 25. The number of the spoke bodies 22 is determined in consideration of, for example, the number of hub bolt holes on the vehicle side, the rigidity and strength of the entire wheel, and the like. Further, the dimensions of the width and thickness of the spoke body 22 are appropriately determined in consideration of the above-described rigidity, strength, etc., although there are restrictions such as casting or forging conditions.

  The disk reinforcing member 3 is made of a fiber reinforced resin, and is bonded to the wheel base 2 via an adhesive (C), thereby increasing the mechanical strength of the vehicle wheel 1 as a whole. The disc reinforcing member 3 shown in FIGS. 1A and 1B has a shape corresponding to the wheel fixing portion 21, the rim portion 23, and the spoke body 22 provided in the wheel base portion 2 to which the disc reinforcing member 3 is attached. The center portion 31 in which the hub hole 31 a is formed, the five spoke-shaped disk portions 32 radially extending from the center portion 31, and the center portion 31 and the disk portion 32 are connected to each other. And an outer peripheral portion 33.

  With the above configuration, the disc reinforcing member 3 is arranged so that the center portion 31 corresponds to the wheel fixing portion 21 of the wheel base portion 2, and the disc portion 32 is arranged corresponding to the spoke body 22 of the wheel base portion 2, Further, the outer peripheral portion 33 is arranged corresponding to the rim portion 23 of the wheel base portion 2. In addition, the disk portion 32 can cover the pair of thick portions 22A and 22B and the thinned portion 22C constituting the spoke body 22 of the wheel base portion 2 with one spoke-like disk portion 32. It is configured. Further, the disc reinforcing member 3 is provided with a plurality of through holes 34, and the mounting screws 4 are inserted into the through holes 34 and screwed into the plurality of screw holes 24 provided in the wheel base 2. The wheel base 2 and the disk reinforcing member 3 are fixed by screwing and are bonded via an adhesive (C) (not shown).

  In the present embodiment, as shown in the illustrated example, at least a part of the disk portion, that is, a portion other than the spoke body 22 formed in an elongated shape is formed as a window portion 22D which is a penetrating portion. However, it is configured as a material weight reduction area for reducing the amount of material used to reduce weight. In the present embodiment, as described above, the volume of the metal material can be reduced when at least a part of the wheel base 2 is the window part 22D or when a part of the wheel base part 2 is thin and used as a material weight loss region. The wheel base 2 and thus the entire vehicle wheel 1 can be reduced in weight. Here, in the vehicle wheel 200 having a configuration used conventionally as shown in FIG. 6, only the window portion 202 </ b> D is provided between the spoke-like disc portions 202. In the wheel base portion 2 of the present embodiment shown in FIG. 1 (c), the lightening portion 22C is further provided in each of the spoke bodies 22, thereby further reducing the weight. According to the vehicle wheel 1 having such a configuration, the weight is further significantly reduced as compared with a general metal wheel.

  On the other hand, when the metal wheel base 2 is provided with the window portion 22D as a penetrating portion as described above or a thin portion at many locations, the mechanical strength characteristics of the wheel base portion 2 may be slightly reduced. . On the other hand, in the vehicle wheel 1 of the present embodiment, the mechanical strength characteristic of the entire vehicle wheel 1 is obtained by attaching and attaching the disk reinforcing member 3 to the wheel base 2 via the adhesive (C). It is possible to maintain and improve.

  In the vehicle wheel 1 of the present embodiment, as described above, a plurality of spoke-shaped spokes formed radially so that the disk reinforcing member 3 corresponds to the spoke body 22 constituting the disk part of the wheel base 2. It is preferable to have a configuration in which the disc portion 32 is arranged and the space between them is bonded via an adhesive (C). By adopting such a configuration, a spoke body having a hollow cross section having a high section modulus is formed. Therefore, both of the weight reduction of the vehicle wheel 1 as described above and the maintenance and improvement of mechanical strength characteristics are both achieved. The effect is obtained more remarkably. In the present embodiment, priority is given to the effect of weight reduction, and the thickness of the lightening portion 22C is taken as deeply as possible, so that, for example, the lightening portion 22C is a window that penetrates the spoke body 22. It is also possible to configure as a part (space part). Also in such a case, the spoke-like member provided in the disk reinforcing member 3 so as to correspond to the shape of each spoke member 22 provided in the wheel base portion 2 and the window portion penetrating the spoke member 22. What is necessary is just to set it as the structure by which each part of the disc part 32 was extended in multiple numbers radially.

  In the vehicle wheel 1 of the present embodiment, it is more preferable that an anodic oxide coating (D) (not shown) is formed on the surface of the wheel base 2 to be bonded to at least the disk reinforcing member 3. Thus, the effect of improving the corrosion resistance when the wheel base 2 is made of an aluminum material is obtained by forming the anodized film (D) on the surface to be bonded to the disk reinforcing member 3 in the wheel base 2. .

  Furthermore, in this embodiment, although illustration is abbreviate | omitted, it is more preferable that the to-be-adhered surface with the disc reinforcement member 3 of the wheel base 2 is processed by the primer (E). Thus, by processing the surface to be bonded to the disk reinforcing member 3 in the wheel base 2 with the primer (E), the wheel base 2 and the disk reinforcing member 3 are bonded through the adhesive (C). An effect of improving the adhesive strength is obtained.

  Generally, when a vehicle wheel is mounted on the vehicle and travels, stress is generated in each part of the vehicle wheel due to a load that the vehicle wheel takes. At this time, although depending on the wheel shape, it is generally known that a large stress is likely to be generated near the front and back surfaces of the disk portion in the vehicle wheel. In the present embodiment, as in the above configuration, a part of the disk portion where a large stress is generated is replaced with a disk reinforcing member 3 made of a high-strength and high-rigidity fiber-reinforced composite material (fiber-reinforced resin), which will be described in detail later By applying a large stress to the disk reinforcing member 3 side, it is possible to relieve the stress generated on the spoke body 22 side forming the disk portion of the wheel base portion 2 made of a light metal alloy.

  Furthermore, in the vehicle wheel, the design is differentiated mainly in the disk portion. However, depending on the planned design (design), the shape may be disadvantageous in terms of strength. In addition, in a vehicle wheel made of a single light metal alloy, the limit of strength is limited by the properties of the light metal alloy, so there is no significant impact on the design in order to improve the strength disadvantage. In many cases, measures are taken by increasing the volume of the cross section of the spoke (disk part), but in this case, the wheel weight increases. On the other hand, in this embodiment, as described above, the surface portion (either the front side surface or the back side surface or both surfaces) of the disk portion of the vehicle wheel made of a light metal alloy or the like is fiber reinforced. By adopting a composite structure of metal (light metal alloy) and fiber reinforced resin instead of resin, a structure is adopted in which stress is borne on the fiber reinforced resin side having higher strength than the light metal alloy. As a result, although depending on the design specifications, for example, the shape of the disk part has a hollow structure in which the inside of the spoke is largely hollowed out, so there is a problem in strength while reducing the volume on the light metal alloy side. It becomes possible to make the shape which does not occur.

  As described above, by adopting a configuration in which a fiber reinforced composite material having characteristics of high strength, high rigidity and low specific gravity compared to a light metal alloy is combined with a part of a vehicle wheel made of a light metal alloy, Higher stresses are allowed than for vehicle wheels formed from a single light metal alloy. By appropriately reflecting such characteristics in the design and reducing the volume of the light metal alloy part, it is possible to reduce the weight while providing sufficient strength as a vehicle wheel. That is, as will be described in the present embodiment, the metal wheel base 2 in which the wheel fixing portion 21 and the rim portion 23 are connected by the disc portion, and the disc reinforcing member 3 made of fiber reinforced resin are tensile-ruptured. By adopting a structure bonded via an adhesive (C) having an elongation of 1% or more, the vehicle wheel is excellent in mechanical strength characteristics and can achieve both weight reduction and design. 1 can be realized.

[Material and Manufacturing Method of Each Member Constructing Vehicle Wheel]
Next, a metal wheel base (wheel base (A)) 2, a disk reinforcing member (disk reinforcing member (B)) 3 made of fiber reinforced resin, and an adhesive (C) constituting the vehicle wheel 1 of the present embodiment. ), The material of the anodic oxide coating (D), the primer (E), the production / coating method, etc. are described in detail below.

(Wheel base (A))
As a material of the metal wheel base 2 constituting the vehicle wheel 1 of the present embodiment, for example, various materials such as steel, aluminum alloy, and magnesium alloy can be used. However, strength, weight reduction, and durability are possible. From this point of view, it is preferable to use an aluminum alloy.

  Moreover, as a manufacturing method of the metal wheel base 2, as in a general aluminum wheel manufacturing method, a molten metal such as an aluminum alloy is poured into a mold and solidified to form a wheel shape. And a forging method in which a solid metal such as an aluminum alloy is put into a mold and pressed at a pressure of thousands of tons. As the metal wheel base 2 in the present embodiment, one manufactured by any of these methods may be adopted, but from the viewpoint of mechanical strength and weight reduction, it is manufactured by a forging method. It is more preferable to use one.

  When the wheel base 2 is manufactured by a casting method, AC4CH or the like can be used as an aluminum alloy for casting. Further, when the wheel base 2 is manufactured by a forging method, a wrought alloy such as 2000 series, 6000 series or 7000 series can be used as the forging aluminum alloy, among which A6061 and A7075 are used. It is more preferable.

  In general, vehicle wheels are manufactured by casting and forging. In any case, after producing a wheel material that has a rough wheel shape, heat treatment suitable for each material is performed, and then the final shape is finished. Cutting is performed. The same applies to the case of manufacturing the metal wheel base 2 in the present embodiment.

  In the cutting process for finishing the final shape as the wheel base 2 as described above, for example, turning to the entire surface of the wheel material using a lathe or a part thereof, and a machining center or the like were used. Cutting to a predetermined shape is performed by milling or the like, and the edge is rounded by deburring so as not to generate an edge portion. Alternatively, instead of the above deburring process, a process of rounding the edge may be performed by a milling process using a machining center.

  Thereafter, the surface of the wheel base 2 is coated. Before the coating, polishing finish with the surface of the wheel base 2 as a bright surface may be performed as necessary.

  In the coating process, before the coating film is formed, first, degreasing and pickling are performed for the purpose of improving the corrosion resistance, and a pretreatment by a chemical conversion treatment is performed. As this chemical conversion treatment, for example, a chromate treatment using chromic acid or chromium phosphate as a chemical conversion treatment liquid, or a non-chromium chemical conversion treatment using titanic acid or zirconium acid can be employed.

  Then, except when it is desired to leave the gloss of the metal by the polishing finish on the surface of the wheel base 2, as an undercoat, a powder coating that can provide a smooth and strong coating film is applied using an electrostatic coating apparatus or the like, After the baking treatment, a colored solvent resin coating is applied using an air spray or an electrostatic coating device. Further, a clear paint is applied on the colored solvent resin paint, and a strong coating film can be obtained by baking.

(Disk reinforcement member (B))
In the present embodiment, the fiber used for the fiber reinforced resin constituting the disk reinforcing member 3 is not particularly limited. For example, metal fibers such as aluminum, brass, and stainless steel, PAN-based, rayon-based, lignin-based, pitch-based Carbon fiber, graphite fiber, glass fiber, and the like. Moreover, as a fiber used for fiber reinforced resin, surface treatment may be given to said fiber. Examples of such surface treatment include metal deposition treatment, and treatment additive adhesion treatment with a coupling agent or sizing agent. Furthermore, as a fiber used for fiber reinforced resin, you may use together 2 or more types of said fiber, Preferably using PAN and a pitch-type carbon fiber together is mentioned.

  As said carbon fiber, the strand strength measured according to JISR7601 (1986), for example, is in the range of 1.0 to 9.0 GPa, and the strand tensile elastic modulus is preferably in the range of 150 to 1000 GPa. Moreover, it is preferable that the diameter of carbon fiber is about 6-12 micrometers, More preferably, it is the range of 6-8 micrometers.

  Further, the resin material used for the fiber reinforced resin constituting the disk reinforcing member 3 is not particularly limited. For example, epoxy resin, phenol resin, bismaleimide resin, polyimide resin, unsaturated polyester resin, vinyl ester resin, urea Examples thereof include resins, alkyd resins, and benzoxazine resins. It is more preferable to employ an epoxy resin as the resin material used for the fiber reinforced resin.

  Further, the fiber reinforced resin constituting the disk reinforcing member 3 includes the carbon fiber and the thermosetting resin as described above, and the elastic modulus in the radial direction of the disk reinforcing member 3 is 20 to 150 GPa. Is more preferable. The mechanical strength when the disk reinforcing member 3 is made of the above-mentioned materials and the elastic modulus in the radial direction is within the above range to adhere to the metal wheel base 2 to form the vehicle wheel 1. Is sufficiently improved.

  The method for molding the disk reinforcing member 3 made of fiber reinforced resin is not particularly limited. For example, an autoclave molding method, a press molding method, a hand layup method, an RTM (resin transfer molding) method, an SMC (sheet molding compound). The method conventionally used for molding fiber reinforced resin, such as the method), can be employed without any limitation. Among the methods described above, the autoclave method or the press molding method is particularly suitable as the method for forming the disk reinforcing member 3.

  A preferable thickness of the disk reinforcing member 3 used in the present embodiment is in the range of 0.5 to 10 mm, and more preferably in the range of 1 to 5 mm. If the thickness of the disk reinforcing member 3 is less than 0.5 mm, the mechanical strength may be insufficient. If the thickness exceeds 10 mm, the cost increases in terms of material costs, which is not economically preferable.

  In addition, a coating layer, a gel coat layer, or the like may be formed on the surface of the disk reinforcing member 3 made of fiber reinforced resin as necessary in order to provide weather resistance and chemical resistance. Examples of the paint used at this time include a phenol resin paint, an epoxy resin paint, a polyurethane resin paint, a silicone resin paint, an acrylic resin paint, and a fluororesin paint. Examples of the gel coat include an epoxy resin, a vinyl ester resin, and an unsaturated polyester resin.

(Adhesive (C))
In the present embodiment, the adhesive (C) (not shown) for bonding the wheel base 2 and the disk reinforcing member 3 is not particularly limited as long as it has a tensile elongation at break of 1% or more after curing. For example, various adhesives such as acrylic, urethane, and epoxy can be used without any limitation.

  As a tensile elasticity modulus of an adhesive agent (C), the range of 200-2000 MPa is preferable, and it is more preferable that it is the range of 300-1500 MPa. In general, a material having a tensile elastic modulus of less than 200 MPa tends to have low heat resistance, and a material having a tensile modulus of more than 2000 MPa tends to have a low tensile elongation at break.

  The tensile elongation at break of the adhesive (C) is specified to be 1% or more. When the tensile elongation at break of the adhesive (C) is less than 1%, the adhesive (C) is used in the radial load endurance test and the rotational bending fatigue test (JIS D4103 “Automobile parts—disc wheel—performance and indication”). It becomes easy to produce a crack and peeling in the layer which becomes. The upper limit of the tensile breaking elongation of the adhesive (C) is not particularly defined, but generally, a material having a tensile breaking elongation exceeding 200% tends to have a low elastic modulus.

  Note that the tensile elongation at break (%) and the tensile modulus of elasticity defined in the present invention are, for example, injecting an adhesive into a mold that has been subjected to an appropriate release treatment, and at a predetermined temperature according to the adhesive. A plate-shaped cured product having a predetermined thickness was prepared by curing for a predetermined time, and then a 1B-type dumbbell test piece was prepared from the cured product according to the method described in JIS K7162, and the test speed was 1 mm / min. It is measured by carrying out a tensile test.

  The thickness of the layer made of the adhesive (C) is preferably in the range of 0.1 to 10 mm, more preferably in the range of 0.2 to 2 mm. If the thickness of the layer made of the adhesive (C) is less than 0.1 mm, the adhesive strength is insufficient, and if it exceeds 10 mm, the stress propagates mainly to the metal wheel base 2, and the disk reinforcing member There is a possibility that the load borne by (B) is reduced, and sufficient strength as a vehicle wheel cannot be exhibited.

  The type (component) of the adhesive (C) is not particularly limited, but examples of the adhesive having high adhesive strength and high durability include acrylic adhesives, urethane adhesives, and epoxy adhesives. Agents and the like. Specific examples of these adhesives include, for example, acrylic adhesives manufactured by ITW PERFRMANCE POLYMERS, PLEXUS (registered trademark) MA310, MA425, and the like, and urethane adhesives such as those manufactured by Etec Corporation. Examples of the MIGHTYGRIP (registered trademark) 5000 and epoxy adhesive include Huntsman's Araldite (registered trademark) AW4858 / Hardner HW4858. Among these, it is preferable to use an acrylic adhesive as the adhesive (C) from the viewpoint of excellent elongation characteristics.

(Anodized film (D))
In the present embodiment, when a not-illustrated anodic oxide coating (D) is provided on at least a surface to be bonded to the disk reinforcing member 3 among the surfaces of the wheel base 2, a conventionally known method can be employed. . For example, an aluminum alloy material forming the wheel base 2 is used as an anode, and electrolysis is performed in an electrolytic solution containing one or more of an inorganic acid such as sulfuric acid and phosphoric acid, or an organic acid such as oxalic acid. A method of forming an anodized film (D) on the surface of the alloy material can be employed. In addition, the anodizing treatment conditions at this time may be appropriately selected according to an ordinary method according to the type and concentration of the electrolytic solution. Usually, the voltage is 10 to 60 V, and the current density is 0.1 to 1000 A / m. ² , treatment time: 5 to 60 minutes, temperature: 10 to 70 ° C.

The thickness of the anodized film (D) is preferably in the range of 0.1 to 50 μm, more preferably in the range of 5 to 25 μm. If the thickness of the anodic oxide coating (D) is less than 0.1 μm, the adhesion is insufficient, and if it exceeds 50 μm, the production cost increases and the economy is impaired.
In the present embodiment, when an anodized film (D) is provided on the surface to be bonded to the disk reinforcing member 3 of the wheel base 2, the anodized film (D) may be porous, Alternatively, sealing treatment may be performed.

(Primer (E))
In this embodiment, when adopting a configuration in which the surface to be bonded to the disk reinforcing member 3 on the surface of the wheel base 2 is treated with the primer (E), the primer (E) is, for example, phosphite. Examples thereof include epoxy compounds, epoxy resins, mixtures of polyethylene imides and polyepoxy derivatives, and acrylic copolymers. Among these, as the primer (E), it is preferable to use a phosphite-based compound or an epoxy-based resin from the viewpoint of showing good adhesion and excellent corrosion resistance.

The primer (E) can be treated by, for example, applying it uniformly to the surface of the metal material that has been ground-treated as necessary, forming the wheel base 2 using a spray, a brush, a roller, or the like. .
In addition, as a primer (E) having improved adhesion strength between the wheel base 2 and the disk reinforcing member 3 by the adhesive (C) and having excellent durability, specifically, manufactured by ITW PERFORMANCE POLYMERS -PLEXUS (registered trademark) PC-120 and the like.

<Second Embodiment>
A vehicle wheel 5 according to a second embodiment of the present invention will be described with reference to FIGS. 2 (a) and 2 (b) as appropriate. Here, FIG. 2A is a perspective view showing the entire vehicle wheel 5 of the present embodiment, and FIG. 2B is an assembled perspective view showing a procedure for bonding the wheel base 2 and the disk reinforcing member 50 together. is there. In the present embodiment, the components common to the vehicle wheel 1 of the first embodiment described above are described with the same reference numerals, and detailed description thereof is omitted.

  In the vehicle wheel 5 of the present embodiment, as shown in the drawing, the disk reinforcing member 50 made of the same material as the fiber reinforced resin described in the first embodiment is disposed on the front side surface 2A side of the wheel base portion 2 substantially. It is different from the vehicle wheel 1 of the first embodiment shown in FIGS. 1A to 1C in that it is configured to be completely covered. On the other hand, in the vehicle wheel 5 of the present embodiment, a metal wheel base 2 having the same configuration as that of the first embodiment is used. As in the case of the first embodiment, the wheel base 2 is used. And the disk reinforcing member 50 are bonded via an adhesive (C) (not shown).

  As shown in FIGS. 2 (a) and 2 (b), the disc reinforcing member 50 used in the vehicle wheel 5 of the present embodiment is formed in a substantially disc shape, and a center portion in which the hub hole 51a is formed. 51, a flat disk portion 52 extending in the radial direction from the center portion 51, and an outer peripheral portion 53 disposed on the radially outer side of the disk portion 52. Further, the disc reinforcing member 50 has a plurality of through holes 54, and the mounting screws 4 are inserted into the through holes 54 and screwed into the plurality of screw holes 24 provided in the wheel base portion 2. The wheel base 2 and the disk reinforcing member 50 are fixed by screwing and are bonded via an adhesive (C) (not shown). Further, the center portion 51 of the disk reinforcing member 50 is provided with a total of five bolt insertion holes 51 b so as to correspond to the hub bolt holes 25 provided in the wheel base 2. Further, in this embodiment, in order to mount the air valve, a notch (not shown) is provided in a part of the outer peripheral portion 53 of the disk reinforcing member 50 or a hole ( (Not shown) can be provided.

  In the illustrated example, the disk reinforcing member 50 is arranged so that the center portion 51 corresponds to the wheel fixing portion 21 of the wheel base portion 2 and the disk portion 52 corresponds to the disk portion of the wheel base portion 2 according to the above configuration. Further, the outer peripheral portion 53 is arranged corresponding to the rim portion 23 of the wheel base portion 2. And the said disk part 52 is comprised so that the several spoke body 22 which comprises the disk part of the wheel base part 2 can be covered completely with window part 22D.

  In the present embodiment, as described above, the metal wheel base 2 and the disk reinforcing member 50 made of fiber reinforced resin are bonded via an adhesive (C) (not shown). As in the case of the first embodiment, even when the amount of the material used for the wheel base 2 is reduced, it is possible to ensure sufficient mechanical strength of the entire wheel. Therefore, according to the vehicle wheel 5 of the present embodiment, the mechanical strength characteristics are excellent, and it is possible to achieve both weight reduction and design.

<Third Embodiment>
A vehicle wheel 6 according to a third embodiment of the present invention will be described with reference to FIGS. 3A and 3B as appropriate. Here, FIG. 3A is a perspective view showing the entire vehicle wheel 6 of the present embodiment, and FIG. 3B is an assembled perspective view showing a procedure for bonding the wheel base portion 2 and the disk reinforcing member 60. is there. In the present embodiment, the same reference numerals are used to describe the configurations common to the vehicle wheels of the first and second embodiments described above, and detailed descriptions thereof are omitted.

  As shown in the illustrated example, the vehicle wheel 6 of the present embodiment has a plurality of disk reinforcing members 60 made of fiber reinforced resin similar to those of the first embodiment, each formed in a substantially strip shape. In the present embodiment, a plurality of substantially strip-shaped disc reinforcing members 60 are provided so as to cover the respective spoke bodies 22 forming the disc portion of the wheel base portion 2. This is different from the vehicle wheels 1 and 5 of the first and second embodiments shown in FIG. On the other hand, in the vehicle wheel 6 of the present embodiment, the same metal wheel base 2 as in the first and second embodiments is used, and the wheel base 2 and the disk reinforcing member 60 are the same as described above. It is bonded via an adhesive (C) (not shown).

  As shown in FIGS. 3A and 3B, the plurality of disk reinforcing members 60 used in the vehicle wheel 6 of the present embodiment are formed in a substantially strip shape and are bonded to the wheel base 2. A center portion 61 disposed corresponding to the wheel fixing portion 21, a disk portion 62 extending from the center portion 61, and an outer edge portion 63 disposed in communication with the disk portion 62. Similarly to the above, a plurality of through holes 64 are formed in the disk reinforcing member 60, and the mounting screws 4 are inserted into the through holes 64 and screwed into the plurality of screw holes 24 provided in the wheel base 2. Thus, the wheel base 2 and the plurality of disk reinforcing members 60 are screwed and fixed and are bonded via an adhesive (C) (not shown).

  In the illustrated example of the disk reinforcing member 60, the center portion 61 is disposed corresponding to the wheel fixing portion 21 of the wheel base portion 2 and the disk portion 62 corresponds to the spoke body 22 of the disk portion of the wheel base portion 2 due to the above configuration. Further, the outer edge portion 63 is disposed corresponding to the rim portion 23 of the wheel base portion 2. The plurality of disc reinforcing members 60 formed in a substantially strip shape cover the pair of thick portions 22A and 22B forming the spokes 22 of the disc portion of the wheel base 2 together with the thinned portions 22C. Is provided.

  In the present embodiment, as described above, the metal wheel base 2 and the plurality of disk reinforcing members 60 made of fiber reinforced resin are bonded via an unillustrated adhesive (C). As in the case of the first and second embodiments, sufficient mechanical strength of the entire wheel can be ensured even when the amount of material used for the wheel base 2 is reduced. Therefore, according to the vehicle wheel 6 of the present embodiment, the mechanical strength characteristics are excellent, and it is possible to achieve both weight reduction and design.

<Fourth Embodiment>
A vehicle wheel 7 according to a fourth embodiment of the present invention will be described with reference to FIGS. 4 (a) and 4 (b) as appropriate. Here, FIG. 4A is a perspective view showing the entire vehicle wheel 7 of this embodiment, and FIG. 4B is an assembled perspective view showing a procedure for bonding the wheel base 2 and the disk reinforcing members 70 and 170 together. FIG. Also in this embodiment, detailed description of the configuration similar to the vehicle wheel of the first to third embodiments described above may be omitted.

  The vehicle wheel 7 of the present embodiment is provided with two disk reinforcing members 70 and 170 made of fiber reinforced resin as in the illustrated example, and therefore the vehicle wheel 1 and 5 shown in FIGS. , 6 is different. Further, the vehicle wheel 7 of the present embodiment is the same as the vehicle wheels 1, 5, 6 shown in FIGS. 1 to 3 in that the wheel base 40 is provided with a total of five spoke bodies 42. However, it is provided with a thick portion that forms an edge with respect to the window portions on both sides, and a thinned portion between the thick portions, in that each spoke body 42 is configured to be thin. This is different from the vehicle wheels 1, 5, and 6 shown in FIG.

  The wheel base 40 used in the present embodiment has a disk portion in which a plurality of spoke bodies 42 are radially extended from the wheel fixing portion 41 toward the rim portion 43. In the example shown in FIGS. 4A and 4B, the spoke bodies 42 are provided at a total of five locations, and five hub bolt hole portions 45 formed around the hub hole 46 of the wheel fixing portion 41. These are extended radially from the vicinity of each of them toward the rim portion 43 on the radial direction side.

  One disk reinforcing member 70 is made of a fiber reinforced resin as described above, and has a shape corresponding to the front side surface 40A of the wheel base 40 to which the disk reinforcing member 70 is attached. That is, the disc reinforcing member 70 includes a center portion 71 in which a hub hole 71a is formed, five spoke-like disc portions 72 radially extending from the center portion 71, a center portion 71 and a disc And an outer peripheral portion 73 connected by the portion 72. The center portion 71 of the disk reinforcing member 70 is provided with five bolt insertion holes 71 b at positions corresponding to the five hub bolt hole portions 45 provided in the wheel base 40.

  The other disk reinforcing member 170 is also made of the above-described fiber reinforced resin, and is configured to correspond to the back side surface 40B of the wheel base 40 to which the disk reinforcing member 170 is attached. That is, the disk reinforcing member 170 is configured in a substantially short cylindrical shape in the illustrated example, and the spoke-shaped disk portions 172 are evenly spaced from the outer peripheral portion 173 on the front side surface 170A of the cylindrical portion 170C at a total of five locations. It extends toward the radial center. Further, the tip 171 of the disk portion 172 is configured to be disposed in the vicinity of the wheel fixing portion 41 of the wheel base 40 when attached to the wheel base 40.

  In the vehicle wheel 7 of the present embodiment, one disk reinforcing member 70 is bonded to the front side surface 40A side of the wheel base 40 via an adhesive (C). At this time, the spoke-like disc portion 72 provided in the disc reinforcing member 70 is bonded so as to cover the spoke body 42 provided in the wheel base portion 40.

  Further, the other disk reinforcing member 170 is inserted from the front side surface 170A to the back side surface 170B so as to be fitted into the internal space from the opening on the back side surface 40B side of the wheel base 40. At this time, the cylindrical portion 170C of the disk reinforcing member 170 is bonded via the adhesive (C) so as to be overlapped with the inner surface side of the rim portion 43 of the wheel base portion 40, and spokes provided at five locations. A disk-shaped disc portion 72 is superposed on the back side of the five spoke bodies 42 of the wheel base portion 40 and is bonded via an adhesive (C).

  As described above, the vehicle wheel 7 of the present embodiment includes the two disk reinforcing members 70 and 170 made of fiber reinforced resin, and one disk reinforcing member 70 is provided on the front side surface 40A of the metal wheel base 40. Is bonded via an adhesive (C) (not shown), and the other disk reinforcing member 170 is inserted from the back side surface 40B of the wheel base 40, and bonded inside the wheel base 40 via the adhesive (C). It is set as the structure. As a result, as in the case of the above-described embodiments, even when the amount of material used for the wheel base 40 is reduced, it is possible to ensure sufficient mechanical strength of the entire wheel. Therefore, according to the vehicle wheel 7, it is possible to achieve both a reduction in weight and design as well as excellent mechanical strength characteristics.

<Fifth Embodiment>
A vehicle wheel 8 according to a fifth embodiment of the present invention will be described with reference to FIGS. 5A and 5B as appropriate. Here, FIG. 5A is a perspective view showing the entire vehicle wheel 8 of the present embodiment, and FIG. 5B is an assembled perspective view showing a procedure for bonding the wheel base 2 and the disk reinforcing members 70 and 80 together. FIG. In the present embodiment, the same or similar configurations as those of the vehicle wheel of the fourth embodiment described above are described with the same reference numerals, and detailed description thereof may be omitted.

  The vehicle wheel 8 of the present embodiment is provided with two disk reinforcing members 70 and 80 made of fiber reinforced resin as shown in the figure, and the other disk reinforcing member 80 is the same as the one disk reinforcing member 70. It is different from the vehicle wheel 7 of the fourth embodiment described above in that it is configured as a thin member. On the other hand, in the vehicle wheel 8 of the present embodiment, a metal wheel base 40 and a disk reinforcing member 70 having the same configuration as in the fourth embodiment are used, and the same as in the above embodiments. The wheel base 40 and the two disk reinforcing members 70 and 80 are bonded together via an adhesive (C) not shown.

  The other disk reinforcing member 80 used in the present embodiment is made of the above-described fiber reinforced resin, and corresponds to the back side surface 42B of the spoke body 42 constituting the disk portion of the wheel base 40 to which the disk reinforcing member 80 is attached. It is configured. In the disk reinforcing member 80, spoke-shaped disk portions 82 are arranged at a total distance of five from a substantially short cylindrical outer peripheral portion 83 and extend toward the center in the radial direction. Further, the distal end portion 81 of the disc portion 82 is configured to be disposed in the vicinity of the wheel fixing portion 41 of the wheel base portion 40 when attached to the wheel base portion 40. That is, the disc reinforcing member 80 has a cylindrical portion in contact with the inner surface of the rim portion 43 of the wheel base portion 40 with respect to the disc reinforcing member 170 shown in FIGS. The only difference is that the vehicle-side portion is removed from the cylindrical portion.

  And as for the vehicle wheel 8 of this embodiment, one disk reinforcement member 70 is adhere | attached on the front side surface 40A side of the wheel base 40 via an adhesive agent (C) similarly to the case of 4th Embodiment. . The other disk reinforcing member 80 is inserted into the inner space from the opening on the back side surface 40B side of the wheel base 40, and the spoke-like disk portions 82 provided at five locations are the five disk portions of the wheel base 40. It adhere | attaches via an adhesive agent (C) so that it may overlap with the back side surface 42B of the spoke body 42 of a location.

  As in the case of the fourth embodiment, the vehicle wheel 8 of the present embodiment is provided with two disk reinforcing members 70 and 80 made of fiber reinforced resin, and the disk side surface 40A of the metal wheel base 40 is disk reinforced. The member 70 is bonded via an adhesive (C) (not shown), and a disk reinforcing member 80 is inserted from the back side surface 40B of the wheel base 40, and the disk portion of the wheel base 40 is attached inside the wheel base 40. It is set as the structure adhere | attached through the adhesive agent (C) on the back side surface 42B of the spoke body 42 to comprise. Thereby, since the vehicle wheel 8 can secure sufficient mechanical strength of the entire wheel even when the amount of the material used for the wheel base 40 is reduced as described above, the vehicle wheel 8 is excellent in mechanical strength characteristics. At the same time, it is possible to achieve both weight reduction and design.

<Effect>
According to the vehicle wheels 1, 5, 6, 7, and 8 of the present embodiment, as described above, the metal wheel base (A) and the disk reinforcing member (B) made of fiber reinforced resin are tensioned. By adopting a structure in which the breaking elongation is bonded via an adhesive (C) having a strength of 1% or more, the wheel base (A) and the disk reinforcing member (B) are firmly bonded, and the entire wheel machine Since the mechanical strength is improved, an excellent mechanical strength characteristic can be obtained without causing abrupt destruction. Moreover, even when the metal volume of the metal wheel base (A) is reduced, the high mechanical strength characteristics of the entire wheel can be maintained, so that the weight can be effectively reduced. Furthermore, as the weight can be reduced, the design freedom on the design surface is also improved, so that the entire wheel can be given excellent design properties. Therefore, it is possible to provide the vehicle wheels 1, 5, 6, 7, and 8 that are excellent in mechanical strength characteristics and can achieve both weight reduction and design.

EXAMPLES Hereinafter, although an Example is given and the vehicle wheel of this invention is demonstrated more concretely, this invention is not limited to these examples.
In the following examples, “%” represents “mass%”.

[Example 1]
(Manufacture of metal wheel base (A1))
First, an aluminum alloy (A6061) was formed into a rough wheel shape by die forging to obtain a wheel material. After that, the wheel material is cut to finish the outer shape equivalent to the wheel product by cutting the surface and the end. Wheel size: 19 inch × 8.5 J, inset: 50 mm, mounting hole P. C. D. : Φ130 mm, 5-hole metal wheel base (A1) shaped part was obtained. At this time, as a schematic shape of the shaped part, as shown in FIG. 1 (c), the disk portion is formed in a spoke shape, the penetrating window portion is large, and furthermore, a hollow portion is formed in each spoke body Provided shape with reduced material usage.

  Then, the surface of the resulting shaped part is subjected to pretreatment by alkali degreasing and chemical conversion treatment, undercoating with a powder coating and color coating with a solvent coating, and then applying a clear coating as a top coating. A metal wheel base (A1) as shown in 1 (a) to (c) was obtained.

(Manufacture of disk reinforcing member (B1) made of fiber reinforced resin)
In manufacturing the disk reinforcing member (B1) made of fiber reinforced resin, first, a prepreg 1 having a predetermined shape (manufactured by Mitsubishi Rayon Co., Ltd .; trade name: TR3523-366G; twill weave, resin content 40%) is used as a warp fiber. 10 plies are laminated so that the direction is [0 ° / 72 ° / 144 ° / 216 ° / 288 °] _2, and each of the spoke-like disc portions of the disc reinforcing member (B1) is moved from the hub hole to the rim portion. The base material which the direction extended to (1) corresponds with each fiber direction was obtained. A preform was prepared by heating and pressurizing the substrate using a preform apparatus. Then, this preform is placed in a lower mold made of a metal made of an upper mold and a lower mold, the temperature of which is adjusted in advance to 140 ° C., and then the upper mold and the lower mold are closed, and the mold temperature The pressure was molded under the conditions of molding pressure: 8 MPa and molding time: 10 minutes. Thereafter, the mold was opened to obtain a molded product of fiber reinforced resin having a thickness of 2 mm.

Next, the obtained molded product was processed into a predetermined shape by cutting.
Subsequently, the back surface was subjected to sandblasting using # 80 carborundum sand for the fiber reinforced resin molded product processed into a predetermined shape.
Further, the surface of the above-mentioned fiber reinforced resin molded product was washed with water, degreased with isopropyl alcohol, an acrylic paint was applied thereon by a spray coating method, and set at room temperature for 5 minutes. Thereafter, a surface layer having a film thickness of 25 μm is formed by curing at 80 ° C. for 40 minutes, and a disk reinforcing member (B1) made of a fiber reinforced resin as shown in FIGS. 1 (a) and 1 (b). Got.

(Join of wheel base (A1) and disc reinforcing member (B1))
Next, the adhesive (C1) (product name: PLEXUS MA310; registered trademark) manufactured by ITW PERFORMANCE POLYMERS is applied to the adherend surface of the metal wheel base (A1) obtained as described above in a thickness of 0.2 mm. Then, it was bonded to a disk reinforcing member (B1) made of fiber reinforced resin. Further, using M7 bolts (seat surface diameter: φ12.5 mm) and fastening with a fastening force of 15.0 N · m to obtain a vehicle wheel of Example 1 as shown in FIG. Left for 1 day. And while examining the adhesive strength by an adhesive agent (C) with the following method, the rotation bending fatigue test, the radial direction load endurance test, and the impact test were implemented on each condition shown below.

(Measurement of tensile elongation at break and tensile modulus of adhesive)
As an appropriate release agent, an adhesive is poured into a mold treated with Chemlease 70-90 (registered trademark) manufactured by Chem Lease Co., Ltd., cured at room temperature for 24 hours, and a plate having a thickness of 2 mm. A cured product was prepared. And from this hardened | cured material, the 1B-type dumbbell test piece was produced according to the method of JISK7162, and the tensile breaking point elongation and the tensile elasticity modulus were measured by performing a tensile test at a test speed of 1 mm / min.

(Adhesive strength test)
The adhesive strength between the wheel base (A1) and the disk reinforcing member (B1) bonded via the adhesive (C) in the above procedure is obtained by processing equivalent to the adherend surface of the wheel base (A1). JIS K6850 “Adhesive-Rigidity” using a flat plate of aluminum alloy and a flat plate of fiber reinforced resin equivalent to the disc reinforcing member (B1) and surface treatment equivalent to the adherend surface of the disc reinforcing member The measurement was performed according to the method prescribed in “Testing method of tensile shear bond strength of adhesive”, and the results are shown in Table 1 below.

(Rotating bending fatigue test)
The vehicle wheel obtained by the above procedure was subjected to a rotational bending fatigue test in accordance with the rotational bending endurance test defined in JIS D4103 “Automobile Parts—Disk Wheel—Performance and Display”. At this time, a predetermined load is applied to the vehicle wheel, and after 100,000 rotations, a crack (inspection by a dye penetrant flaw detection method), a remarkable deformation, and an abnormal loosening of a fastening nut or bolt are set as “O”, The results are shown in Table 1 below.

(Radial load endurance test)
The vehicle wheel obtained by the above procedure was subjected to this test according to the radial load endurance test defined in the above JIS D4103. At this time, a predetermined load is applied to the vehicle wheel, and after 500,000 revolutions, a crack (inspection by dye penetrant flaw detection method), a significant deformation, and an abnormal loosening of a fastening nut or bolt are set as “O”, The results are shown in Table 1 below.

(Impact test)
The vehicle wheel obtained by the above procedure was subjected to an impact test in accordance with the passenger vehicle impact test defined in JIS D4103. Then, after the impact test, those having no wheel penetration crack (inspected by a dye penetrant flaw detection method), splitting of the rim and the disk, and no air leakage were designated as “◯”, and the results are shown in Table 1 below.

[Example 2]
The shape part of the wheel base made of aluminum alloy obtained by the same method as in Example 1 was subjected to a voltage of 20 V, a current density of 60 A / m ² , and a treatment time at 25 ° C. using an 18% dilute sulfuric acid solution. By treating in 60 minutes, an anodized film treatment of about 10 μm was formed on the surface to obtain a metal wheel base (A2).

In addition, prepreg 1 and prepreg 2 having a predetermined shape (manufactured by Mitsubishi Rayon Co., Ltd .; trade name: TR3110-360GMP; plain weave, resin content 40%), and the fiber direction of warp [0 ° / 72 ° / 144 ° / 216 ° / 288 °] to be _2, except that to obtain the most surface layer 1 ply as prepreg 2, a prepreg 1 and the remaining 9 ply laminate substrate, in the same manner as in example 1, fiber reinforced resin A disk reinforcing member (B2) comprising:

Thereafter, the obtained metal wheel base (A2) and the disk reinforcing member (B2) made of fiber reinforced resin were joined in the same manner as in Example 1 to obtain the vehicle wheel of Example 2. .
The obtained vehicle wheel was subjected to an evaluation test in the same manner as in Example 1, and the results are shown in Table 1 below.

[Example 3]
The surface of the metal wheel base (A2) obtained in the same manner as in Example 2 was impregnated with a primer (D1) (ITW PERFORMANCE POLYMERS, product name: PLEXUS PC-120; registered trademark) in a cloth. After application, the excess primer was wiped off with a dry cloth and dried at room temperature for 2 minutes to obtain a metal wheel base (A3).

Thereafter, the obtained metal wheel base (A3) and the disk reinforcing member (B2) made of fiber reinforced resin were joined in the same manner as in Example 1 to obtain the vehicle wheel of Example 3. .
The obtained vehicle wheel was subjected to an evaluation test in the same manner as in Example 1, and the results are shown in Table 1 below.

[Example 4]
The vehicle of Example 4 is the same as Example 3 except that instead of the adhesive (C1), the adhesive (C2) (product name: PLEXUS MA425; registered trademark) manufactured by ITW PERFORMANCE POLYMERS is used. Got a wheel for.
The obtained vehicle wheel was subjected to an evaluation test in the same manner as in Example 1, and the results are shown in Table 1 below.

[Example 5]
(Manufacture of metal wheel base (A4))
First, an aluminum alloy (AC4CH) is melted and poured into a mold to obtain a wheel material formed into a rough wheel shape. And finished to the same outer shape as the wheel product, the same shape as the wheel base (A1) used in Example 1, wheel size: 19 inch × 8.5 J, inset: 50 mm, mounting hole P. C. D. : Φ130 mm, 5-hole metal wheel base shape part was obtained.

  Next, the surface of the resulting shaped part is subjected to pretreatment by alkali degreasing and chemical conversion treatment, undercoating with a powder coating, and color coating with a solvent coating, and then applying a clear coating as a top coating, A metal wheel base (A4) was obtained.

Thereafter, the metal wheel base (A4) obtained above and the disk reinforcing member (B2) made of fiber reinforced resin were bonded to an adhesive (C3) (manufactured by Huntsman; trade name: Araldite AW4858 / Hardner 4858; registration). The vehicle wheel of Example 5 was obtained.
The obtained vehicle wheel was subjected to an evaluation test in the same manner as in Example 1, and the results are shown in Table 1 below.

[Example 6]
Prepreg 2 and prepreg 3 (trade name: TR366E250S UD; resin content 40%, manufactured by Mitsubishi Rayon Co., Ltd.) having a predetermined shape, the fiber direction is [0 ° / 72 ° / 144 ° / 216 ° / 288 °] ₂ Thus, except that the base layer was obtained by laminating 1 ply with the outermost layer being the prepreg 2 and the remaining 9 plies of the prepreg 3, the disk reinforcing member (B3) made of fiber reinforced resin was prepared in the same manner as in Example 1. Produced.

Thereafter, the metal wheel base (A3) and the disk reinforcing member (B3) made of fiber reinforced resin were joined in the same manner as in Example 1 using the adhesive (C1). The vehicle wheel was obtained.
The obtained vehicle wheel was subjected to an evaluation test in the same manner as in Example 1, and the results are shown in Table 1 below.

[Example 7]
A vehicle wheel of Example 7 was obtained by the same method as Example 3 except that the disk reinforcing member (B4) was used instead of the disk reinforcing member (B2).
The disc reinforcing member (B4) has a shape that almost completely covers the front side surface of the wheel base (A2) as shown in FIG. 2, and the disc is made of the same material, laminated structure and molding method as the disc reinforcing member (B2). In each portion corresponding to the spoke body 22 of the reinforcing member (B4), a molded product in which the direction extending from the hub hole to the rim portion coincided with each fiber direction.
The obtained vehicle wheel was subjected to an evaluation test in the same manner as in Example 1, and the results are shown in Table 1 below.

[Comparative Example 1]
A metal wheel base (A1) obtained by the same method as in Example 1 and a disk reinforcing member (B2) made of a fiber reinforced resin obtained by the same method as in Example 2 were combined with an adhesive (C4). ) Was used in the same manner as in Example 1 to obtain a vehicle wheel of Comparative Example 1.
The obtained vehicle wheel was subjected to an evaluation test in the same manner as in Example 1, and the results are shown in Table 1 below.

[Comparative Example 2]
A vehicle wheel of Comparative Example 2 was obtained in the same manner as Comparative Example 1 except that the adhesive (C5) was used instead of the adhesive (C4).
The obtained vehicle wheel was subjected to an evaluation test in the same manner as in Example 1, and the results are shown in Table 1 below.

[Comparative Example 3]
A vehicle wheel made of a single metal material is produced only with a metal wheel base (A1) obtained by the same method as in Example 1, and an evaluation test is carried out in the same manner as in Example 1. The results are shown in Table 1 below.

In Table 1, each symbol indicating an adhesive and a primer represents the following various adhesives or primers.
(1) Adhesive C1: Acrylic adhesive
Made by ITW PERFORMANCE POLYMERS
PLEXUS (registered trademark) MA310
Tensile elongation at break: 10%
Tensile modulus: 1100 MPa
(2) Adhesive C2: Acrylic adhesive
Made by ITW PERFORMANCE POLYMERS
PLEXUS (registered trademark) MA425
Tensile elongation at break: 90%
Tensile modulus: 410 MPa
(3) Adhesive C3: Epoxy adhesive
Huntsman
Araldite (registered trademark) AW4858
/ Hardner 4858
Tensile elongation at break: 7%
Tensile modulus: 1600 MPa
(4) Adhesive C4: Epoxy adhesive
Araldite (registered trademark) 2014-1 manufactured by Huntsman
Tensile elongation at break: <1%
Tensile elastic modulus: 4000 MPa
(5) Adhesive C5: Epoxy adhesive
Denatite (registered trademark) 2024 manufactured by Nagase ChemteX Corporation
Tensile elongation at break: <1%
Tensile modulus: 850 MPa
(6) Primer D1: made by ITW PERFORMANCE POLYMERS
PLEXUS (registered trademark) PC-120 (registered trademark)

[Evaluation results]
As shown in Table 1, the metal wheel base (A) and the disk reinforcing member (B) made of fiber reinforced resin are bonded through an adhesive (C) having a tensile elongation at break of 1% or more. The vehicle wheels of Examples 1 to 6 having the configuration according to the present invention all have an adhesive strength of 7.2 MPa or more, and are firmly bonded as compared with Comparative Examples 1 and 2 (7.0 MPa or less). It became clear that it was. In addition, the vehicle wheels of Examples 1 to 6 are all evaluated as “◯” in the results of the rotational bending fatigue test, the radial load endurance test, and the impact test, and are excellent in various mechanical strength characteristics. Became clear.

  On the other hand, in Comparative Example 1 in which the wheel base (A1) and the disk reinforcing member (B1) were bonded with an adhesive (C4) having a tensile elongation of less than 1%, the adhesive strength was as low as 5.1 MPa, In the rotating bending fatigue test and the radial load endurance test, the evaluation after a predetermined number of revolutions (the presence or absence of cracks, significant deformations, fastening nuts or bolts) was evaluated as “x”. This is presumably because the adhesive (C4) has a tensile elongation of less than 1%, so that cracks and peeling occurred in the layer made of the adhesive (C).

  Further, in Comparative Example 2 in which the wheel base (A1) and the disk reinforcing member (B1) are bonded with an adhesive (C5) having a tensile elongation of less than 1%, as in Comparative Example 1, the bonding is performed. The strength is as low as 7.0 MPa, and in the rotating bending fatigue test and the radial load endurance test, the evaluation after a predetermined number of revolutions (existence of cracks, significant deformation, abnormalities of the fastening nut or bolt) is evaluated as “x”. It became.

  Further, Comparative Example 3 has a configuration of only the wheel base (A1) not provided with the disk reinforcing member (B), and reduces the amount of metal material as in the example shown in FIG. Since the thinned portion was formed, the mechanical strength characteristics were very low, and the rotary bending fatigue test and the radial load endurance test were evaluated as “x”.

  From the results of the above examples, the configuration according to the present invention, that is, the metal wheel base (A) and the disk reinforcing member (B) made of fiber reinforced resin, the adhesive having a tensile elongation at break of 1% or more. By adopting a structure that is bonded via (C), excellent mechanical strength characteristics can be obtained even when the amount of material used in the wheel base (A) is reduced to reduce the weight. It is clear.

  Since the vehicle wheel of the present invention can achieve both excellent mechanical strength characteristics and light weight and design, for example, a general improvement in fuel consumption due to weight reduction of the entire automobile is required. It is very useful in applications such as private cars.

DESCRIPTION OF SYMBOLS 1,5,6,7,8 ... Wheel for vehicles, 2,40 ... Wheel base (A), 2A, 40A ... Front side, 2B, 40B ... Back side, 21, 41 ... Wheel fixing part, 22, 42 ... Spoke body (disc portion), 22A, 22B ... thick portion, 22C ... thinning portion, 22D, 42D ... window portion, 23, 43 ... rim portion, 24 ... screw hole, 25, 45 ... hub bolt hole portion, 26 , 46 ... Hub hole, 3, 50, 60, 70, 80, 170 ... Disc reinforcing member (B), 31, 51, 61, 71 ... Center part, 31a, 51a, 71a ... Hub hole, 51b, 71b ... Bolt Insertion hole, 32, 52, 62, 72, 82, 172 ... disk part, 33, 53, 73, 83, 173 ... outer peripheral part, 34, 54, 64 ... through hole, 63 ... outer edge part, 81, 171 ... tip Part, 170A ... front side, 170B ... back side , 170C ... cylindrical portion, 4 ... mounting screws.

Claims (8)

  A metal wheel base (A) in which a wheel fixing part and a rim part are connected by a disk part, and a disk reinforcing member (B) made of a fiber reinforced resin, an adhesive having a tensile elongation at break of 1% or more The vehicle wheel bonded through (C).   The vehicle wheel according to claim 1, wherein the adhesive (C) has a tensile modulus of 200 to 2000 MPa.   The vehicle wheel according to claim 1 or 2, wherein an anodized film (D) is formed on at least a surface of the wheel base (A) to be bonded to the disk reinforcing member (B).   The vehicle surface according to any one of claims 1 to 3, wherein the surface of the wheel base (A) to be bonded to the disk reinforcing member (B) is treated with a primer (E). wheel.   The vehicle wheel according to any one of claims 1 to 4, wherein the adhesive (C) is an acrylic adhesive. The disk portion of the wheel base portion (A) has a shape in which a plurality of spoke bodies extend radially from the wheel fixing portion toward the rim portion,
In the disk reinforcing member (B), a center part and an outer peripheral part are connected by a disk part so as to correspond to the wheel fixing part, the rim part, and the disk part provided in the wheel base part (A). And a plurality of the disk portions provided in the disk reinforcing member (B) are radially extended so as to correspond to the spoke bodies forming the disk portion of the wheel base (A). The vehicle wheel according to claim 1, wherein the vehicle wheel is formed in a spoke shape.   The spoke body forming the disk portion of the wheel base portion (A) includes an edge portion with respect to the wheel fixing portion, an edge portion with respect to window portions on both sides of the spoke body, and an edge portion with respect to the rim portion as a thick portion. The vehicle wheel according to claim 6, wherein the vehicle wheel has a shape that has been left out.   A plurality of the disk parts provided in the disk reinforcing member (B) are radially extended and formed in a spoke shape, and the respective parts adjacent to each other forming the disk part of the wheel base (A) 2 are adjacent to each other. The vehicle wheel according to claim 6, wherein the vehicle wheel is disposed so as to correspond to a shape in which the spoke body of the book and the space portion of the disk portion between the two spoke bodies adjacent to each other are combined.

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