JP5819905B2 - Automotive wheel - Google Patents

Description

  The present invention relates to an automobile wheel that is joined to a wheel rim on which a tire is mounted by internally fitting a wheel disk connected to an axle.

  For example, in an automobile wheel, there is a so-called two-piece type in which a substantially cylindrical wheel rim and a substantially disc-shaped wheel disk are fitted and welded. The wheel rim constituting the two-piece type automobile wheel has a bead seat portion and a flange portion for supporting the tire bead on the front and back sides, and a well portion recessed inwardly between the front and back bead seat portions. A configuration with the is known. The wheel disc includes a disc-shaped hub mounting portion connected to the hub of the axle, a plurality of spoke portions radially provided from the outer peripheral edge of the hub mounting portion, and an outer end of the spoke portion. There is known a configuration including an annular disk flange portion coupled to the disk. Here, in the wheel disc, a plurality of decorative holes defined by the spoke portions and the disc flange portions are formed between adjacent spoke portions. And the wheel for motor vehicles is formed by fitting the disk flange part of a wheel disk in the well part of a wheel rim, and welding both.

  As the above-described automobile wheel, for example, as disclosed in Patent Document 1, a wheel disc includes a flat cylindrical disc flange portion extending substantially in the axial direction, and a spoke portion adjacent to the disc flange portion. A decorative hole is defined.

JP 2009-525191 A (refer to [0016] to [0019], FIG. 1 and FIG. 2)

  In the configuration of Patent Document 1 described above, the disk flange portion of the wheel disk is formed in a flat cylindrical shape and does not have a portion that curves in the front-back direction. Therefore, since the decoration hole is formed relatively large up to the disk flange portion, it has an advantage of excellent design. By the way, a radial load acts on the disk flange portion of the wheel disc through the wheel rim during the traveling of the vehicle to which the vehicle wheel is attached, and bending and twisting from the hub attachment portion through the spoke portion. Such a load acts. Since the disk flange portion of Patent Document 1 has a flat cylindrical shape, it is likely to be deformed by the application of the above-described load, and the deformation may easily cause stress concentration in the welded portion between the wheel rim and the wheel disk. is there. Moreover, due to this stress concentration, there is a concern that the fatigue life may be reduced.

  The present invention proposes an automobile wheel that can exhibit excellent strength and rigidity so as to solve the above-described problems.

  The present invention is connected to a wheel rim having front and back bead seat portions supporting tire beads, and a well portion recessed inwardly provided between the front and back bead seat portions, and an axle hub. A substantially disc-shaped hub mounting portion, an annular disk flange portion fitted in the well portion of the wheel rim, and a plurality of spoke portions connecting the hub mounting portion and the disk flange portion are adjacent to each other. In an automobile wheel including a wheel disc in which a decorative hole is defined by a spoke portion and a disc flange portion, the disc flange portion of the wheel disc has a fitting straight ring portion that fits with a well portion of the wheel rim, Compared with the outer end of the side edge of the spoke part, it extends from the part of the fitting straight ring part that is not connected to the spoke part and is bent radially inward between adjacent spoke parts. To the back And the folding front side edge has a folding angle of 45 degrees or more and 90 degrees or less between the folding front side edge and the fitting straight ring part. An automotive wheel characterized by being a thing.

Here, since the disc flange portion is coupled to the plurality of spoke portions, the bent front side edge portion is formed at a portion not coupled to the spoke portion. In other words, a plurality of bent front side edges are provided intermittently along the circumferential direction, and each is formed so as to have a concentric arc shape. Further, since the bent front side edge has a shape bent inward in the radial direction, the arc-shaped inner end edge forms the peripheral edge of the decorative hole. Therefore, in the structure of this invention, the decoration hole is not formed to the outermost periphery of a wheel disc. Further, the bent front side edge portion is recessed toward the back as compared with the outer end portion of the side edge portion of the spoke portion, so that the inner end edge and the outer end edge of the bent front side edge portion respectively. The shape is recessed toward the back as compared with the outer end of the side edge portion of the spoke portion.
Further, the bent front side edge portion has the bending angle θ of 45 degrees or more and 90 degrees or less, so that the improvement effect of strength and rigidity described later is easily exhibited.

  In such a configuration, the disk flange portion has a bent front side edge portion between adjacent spoke portions, thereby exhibiting excellent strength and rigidity as a shape effect of the bent front side edge portion. . More specifically, each bent front side edge is shaped to be recessed toward the back compared to the shape effect of the shape bent radially inward from the fitting straight ring part and the outer edge of the side edge of the spoke part. Due to the shape effect, high strength and rigidity that can withstand the radial load acting on the disk flange portion and bending and torsional loads can be exhibited. Here, the strength and rigidity that can be exhibited by the present configuration are higher than the strength and rigidity exhibited by only the shape effect of either the shape bent inward or the shape recessed toward the back. Thereby, the deformation | transformation of the disk flange part produced by the load which acts on the said wheel for motor vehicles during driving | running | working of a motor vehicle can be suppressed. Thus, stress concentration acting on the joint where the disk flange of the wheel disk and the well of the wheel rim are joined can be reduced.

  Furthermore, the configuration of the present invention can make the outer end portion of the spoke portion appear to float upward because the bent front side edge portion of the disk flange portion is recessed rearward. Thereby, a spoke part can be shown long in radial direction, and design nature improves. Thus, in this structure, the outstanding design property can be exhibited, improving intensity | strength and rigidity.

  Furthermore, when attaching the wheel cap which covers the design surface side to the wheel for motor vehicles of this invention, the design freedom of this wheel cap increases. Here, for example, when using a wheel cap provided with an opening so as to cover the periphery of the decorative hole, the outer edge of the opening covering the bent front side edge of the wheel disk is greatly inclined to the back side. It can be formed as a shape. This is because the bent front side edge has a shape recessed toward the back as described above. And as the wheel cap, the design range of the inclination angle to the back side of the outer edge of the opening will be widened, so it is possible to design various configurations that change the design of the wheel cap accordingly. It becomes. In particular, a wheel cap having a shape in which the outer edge portion of the opening is greatly inclined to the back side can exhibit a large design because the opening can be formed large. Therefore, even when the wheel cap is mounted, the automobile wheel of the present invention has an excellent advantage that high designability can be exhibited.

  In the above-described automobile wheel, a configuration is proposed in which the bent front side edge portion of the disk flange portion is formed so as to be stepped toward the back as compared with the outer end portion of the side edge portion of the spoke portion. . Here, in other words, this configuration is formed such that the inner end edge and the outer end edge of the bent front side edge part are recessed stepwise toward the back as compared with the outer end of the side edge part of the spoke part. It is the structure which is done.

  In such a configuration, since the bent front side edge portion is recessed in a step shape as compared with the outer end portion of the side edge portion of the spoke portion, the disk flange portion is formed by the shape effect recessed in the step shape. The strength and rigidity can be further improved. Furthermore, the strength and rigidity of the portion where the disc flange portion and the outer end of the spoke portion are coupled can be improved. By improving these strength and rigidity, stress concentration acting by the above-described radial load and bending or torsional load can be relaxed, so that the effect of suppressing deformation of the disk flange portion of the wheel disk described above is improved. Further, the effect of alleviating the stress concentration acting on the joint between the wheel rim and the wheel disc is further improved. Further, since the bent front side edge portion and the outer end portion of the side edge portion of the spoke portion are formed in a stepped shape, the strength and rigidity of the portion that couples both are improved. Along with this, the shape of the coupled part (area occupied by the part) can be reduced, so that a decorative hole can be formed larger, thereby improving the design of the automobile wheel. There is also an excellent advantage that the weight can be reduced.

  Furthermore, since the bent front side edge portion is formed so as to be stepped in comparison with the outer end portion of the side edge portion of the spoke portion, the outer end portion of the spoke portion can be further lifted to the front side. obtain. Thereby, the effect which shows a spoke part long in radial direction and improves the designability further improves.

  In the above-described automobile wheel, the disk flange portion includes a curved coupled side portion that couples the bent front side edge portion and the spoke portion on both sides in the circumferential direction of the bent front side edge portion. A configuration is proposed.

  In such a configuration, since the bent front side edge is coupled to the spoke part via the curved coupled side part, the disk is disposed via the spoke part due to the shape effect of the coupled side part. The above-described operational effect of the present invention, in which stress concentration acting on the joint between the flange portion and the well portion is relaxed, is further improved. Furthermore, since the effect | action which makes the outer end part of a spoke part appear to float up is further improved, the effect of exhibiting the outstanding design property further improves.

  As described above, the vehicle wheel according to the present invention has an adjacent spoke portion from a portion where the disc flange portion of the wheel disc is not coupled to the fitting straight ring portion and the spoke portion of the fitting straight ring portion. A concentric arc-shaped bent front side edge that extends inward and bends inward in the radial direction and is recessed rearward as compared to the outer end portion of the side edge portion of the spoke portion. Since the bending angle between the bent front side edge portion and the fitting straight ring portion is not less than 45 degrees and not more than 90 degrees, the disk flange is formed by the shape effect of the bent front side edge portion. It is possible to exhibit high strength and rigidity that can withstand radial loads acting on the part and bending and torsional loads. Thereby, the deformation | transformation of the disc flange part which may arise during driving | running | working of a motor vehicle can be suppressed, and the stress concentration which acts on the junction part of a wheel disc and a wheel rim can be relieved. In connection with this, the said wheel for motor vehicles can exhibit the outstanding durability with respect to the load which acts during driving | running | working of a motor vehicle. Moreover, since the said bending front side edge part is dented in the back compared with the outer edge part of the side edge part of a spoke part, a spoke part can be shown long in the radial direction (longitudinal direction), and was excellent. The design can be demonstrated. Furthermore, since the bent front side edge portion is recessed rearward as compared with the outer end portion of the side edge portion of the spoke portion, the wheel cap is mounted when the wheel cap is attached to the vehicle wheel. Since the degree of freedom of design is improved, there is an advantage that a wheel cap having a design excellent in design can be adopted.

  In the automobile wheel described above, in the case of a configuration in which the bent front side edge of the disk flange portion is formed so as to be recessed stepwise to the back compared to the outer end portion of the side edge portion of the spoke portion, The strength and rigidity of the disk flange portion can be further improved by the shape effect of recessing in steps. Accordingly, since the effect of suppressing deformation of the disk flange portion is improved, the above-described operation effect of the present invention, which reduces stress concentration acting on the joint between the wheel rim and the wheel disk, is further improved. In addition, since the outer end portion of the spoke portion can be lifted up and shown further, the above-described effect of improving the design of the present invention is further improved.

  In the above-described vehicle wheel, the disk flange portion includes curved coupled side portions that couple the bent front side edge portion and the spoke portion on both sides in the circumferential direction of the bent front side edge portion. In the case of the configuration, the effect of the present invention described above that the stress effect acting on the joint portion between the disk flange portion and the well portion via the spoke portion is alleviated by the shape effect of the coupled side portion. improves.

It is a top view of the wheel 1 for cars of an example concerning the present invention. It is a perspective view of the wheel 1 for cars same as the above. It is a longitudinal cross-sectional view of the automotive wheel 1 same as the above. 3 is a plan view of the wheel disc 3. FIG. 3 is a perspective view of a wheel disc 3. FIG. 3 is a perspective view of a wheel disc 3. FIG. It is an enlarged view of the X section in FIG. 2 is a partially enlarged view of a wheel disc 3. FIG. FIG. 3 is a partially enlarged view showing a coupled region of the spoke portion 24 and the bent front side edge portion 31 of the wheel disc 3. (A) The longitudinal cross-sectional view which expanded the state which attached the wheel cap 91 to the wheel 1 for motor vehicles of a present Example, and the state which attached the wheel cap 121 to the wheel 101 for motor vehicles of a comparative example (B). It is the longitudinal cross-sectional view expanded partially. It is the elements on larger scale which show the coupled area | region of the spoke part 54 and the bending surface side edge part 56 of the wheel disc 53 of another example. It is the elements on larger scale which show the coupled area | region of the spoke part 74 and the bending surface side edge part 76 of the wheel disc 73 of another example. It is a perspective view of the wheel disc 103 of a comparative example.

Embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIGS. 1 to 3, the vehicle wheel 1 of the present embodiment has a disc flange portion 25 of the wheel disc 3 fitted into the well portion 13 of the wheel rim 2, and the well portion 13, the disc flange portion 25, This is a so-called two-piece type structure in which these are joined and integrated by fillet welding. Here, the wheel rim 2 and the wheel disc 3 are each formed by molding a steel flat plate, and the automobile wheel 1 of this embodiment is a steel wheel. Moreover, the welding part 9 produced | generated by the said fillet welding is a junction part concerning this invention.

  In this embodiment, the direction from the back side of the wheel disk 3 to the design surface side is the front direction, and the reverse direction is the back direction. Further, along the wheel radial direction, the direction toward the central axis L (see FIG. 3) of the automobile wheel 1 is inward, and the reverse direction is outward.

  The wheel rim 2 described above has a cylindrical shape with an odd-shaped cross section, and rim flange portions 11a and 11b for supporting sidewall portions of a tire (not shown) are formed on the opening edges on both the front and back sides, respectively. Front and back bead seat portions 12a and 12b, which are respectively coupled to the portions 11a and 11b and seat a bead of the tire, are formed. Further, a well portion 13 projecting inward is provided between the bead sheet portion 12a on the front side and the bead sheet portion 12b on the back side, and the tire bead is dropped into the well portion 13 when the tire is mounted. , So that it can be easily mounted.

  The wheel rim 2 is obtained by forming a rectangular steel flat plate having a predetermined size. More specifically, a rectangular steel flat plate is curved so that its short sides are abutted against each other, and the short sides are butt-joined by upset butt welding to form a cylindrical body (not shown). Thereafter, the cylindrical body is formed into a desired wheel rim shape by performing a roll process of sandwiching a predetermined mold from both the inside and outside thereof. The means for forming the wheel rim 2 from the rectangular flat plate can be a conventionally known method, and details thereof are omitted.

  The wheel disc 3 described above has a substantially disc shape as shown in FIGS. 4 to 6 and is provided with a substantially disc-shaped hub mounting portion 21 having a hub hole 22 opened in the center. A plurality of spoke portions 24 are provided radially outward from the outer peripheral edge of the attachment portion 21. An annular disk flange portion 25 connected to the outer end of each spoke portion 24 is provided so as to extend backward from the outer end. That is, the hub mounting portion 21 and the disk flange portion 25 are connected by the plurality of spoke portions 24. The spoke portions 24 are provided at equal intervals in the circumferential direction, and a decorative hole 27 is defined by the adjacent spoke portions 24 and 24 and the disc flange portion 25. In this embodiment, five spoke portions 24 and five decorative holes 27 are provided.

  A plurality of bolt holes 23 having nut seats around the hub hole 22 are formed in the hub attachment portion 21 at equal intervals on the same circumference. The hub mounting portion 21 and the disc flange portion 25 are provided concentrically with the central axis L of the wheel disc 3 as the center.

  The wheel disk 3 is obtained by pressing a substantially square steel flat plate after cutting the four corners into an arc shape. More specifically, a steel flat plate having four corners cut into an arc shape is formed into a saucer shape having a circular recess at the center, and then the shapes of the hub mounting portion 21 and the spoke portion 24 are formed by drawing, and bolt holes 23 and the decoration hole 27 are drilled. Further, the disk flange portion 25 is formed by wrist-like processing, and the wheel disk 3 is formed. Thus, in the process which shape | molds the wheel disc 3, since it can carry out by the process similar to the past, it abbreviate | omits about the detail.

Next, the main part of the present invention will be described.
In the present embodiment, the spoke portion 24 of the wheel disk 3 includes a central groove portion 31 formed along the longitudinal direction (radial direction), and side edge portions 32 provided on both sides of the central groove portion 31. , 32 (see FIGS. 1 to 9). Here, the side edge parts 32 and 32 are provided so that it may protrude to the surface rather than the center groove part 31. FIG. The spoke part 24 having such a configuration can improve the strength and rigidity of the spoke part 24. Further, in the present embodiment, the outer end portions 32a and 32a of the side edge portions 32 and 32 of the spoke portion 24 are formed in a shape widened to both sides in the circumferential direction (see FIGS. 8 and 9). By forming the outer end portions 32a and 32a of the side edge portions 32 and 32 in this way, the strength and rigidity of the portion where the spoke portion 24 and the disc flange portion 25 are coupled can be improved.

  The above-described disk flange portion 25 is, as shown in FIGS. 3 to 9, a fitting straight ring portion 35 along the front and back directions, and a front side edge of the fitting straight ring portion 35 and is bent radially inward. The bent front side edge portion 36 is provided. Here, the bent front side edge portion 36 is formed in a portion that is not coupled to the spoke portion 24, and is provided between the adjacent spoke portions 24. The bent front side edge portion 36 is coupled to the side edge portions 32 and 32 of the spoke portions 24 and 24 via coupling side portions 38 and 38 provided on both sides in the circumferential direction, respectively. The coupling side portion 38 is formed in a curved shape, and smoothly couples the bent front side edge portion 36 and the side edge portion 32 of the spoke portion 24. The fitting straight ring portion 35 is fitted into the well portion 13 of the wheel rim 2 and welded to the well portion 13.

  The bent front side edge portion 36 of the disk flange portion 25 is intermittently provided in the circumferential direction at a front side portion of the fitting straight ring portion 35 that is not coupled to each spoke portion 24. Each bent front side edge portion 36 forms an arc shape concentrically provided around the central axis L along the fitting straight ring portion 35. Each bent front side edge portion 36 is formed so as to be recessed in a step shape toward the back as compared with the outer end portion 32 a of the side edge portion 32 of the spoke portion 24. That is, the arc-shaped inner end edge 36a of each bent front side edge 36 is recessed stepwise to the back as compared to the outer end 32b of the side edge 32 of the spoke part 24, and each bent front side edge 36 is provided. The arc-shaped outer end edge 36b is formed so as to be recessed stepwise toward the back as compared with the outer end 32b of the side edge part 32 of the spoke part 24. And the continuous side part 38 which comprises the bending surface side edge part 36 and the outer end part 32a of the side edge part 32 of the spoke part 24 comprises the step part for making both into a step shape.

  Here, the bending surface side edge portion 36 is set so that the bending angle θ between the bending surface side edge portion 36 and the fitting straight ring portion 35 is 90 degrees or less as shown in FIG. That is, the bent front side edge portion 36 is not folded back from the front side end edge of the fitting straight ring portion 35. The bent front side edge portion 36 has the bending angle θ of 45 degrees or more and 90 degrees or less. Thereby, the improvement effect of the intensity | strength and rigidity mentioned later is easy to be exhibited highly. Further, the bent front side edge portion 36 is preferably shaped to be bent from the fitting straight ring portion 35 inward in the radial direction.

  Each of the bent front side edges 36 is formed in a substantially uniform shape along the circumferential direction, and the arc-shaped inner end edge 36 a faces the decoration hole 27. And the above-mentioned decoration hole 27 is comprised by the airspace enclosed by the side edge parts 32 and 32 of the adjacent spoke parts 24 and 24, and the said bending surface side edge part 36 between them. That is, the peripheral edge of the decorative hole 27 is constituted by the side edges 32 and 32 of the spoke parts 24 and 24 and the bent front side edge 36 therebetween.

  Thus, in the configuration of the present embodiment, as described above, the disc flange portion 25 of the wheel disc 3 has a configuration in which the bent front side edge portion 36 is provided between the adjacent spoke portions 24, 24, respectively. Therefore, the strength and rigidity of the disk flange portion 25 can be improved by the shape effect of the bent front side edge portion 36. Along with this, the strength and rigidity of the wheel disk 3 are improved, and the strength and rigidity of the automobile wheel 1 can be improved as a whole.

  Then, during the traveling of the automobile to which the automobile wheel 1 is attached, the radial load acting via the wheel rim 2 and the bending / acting acting via the hub attachment portion 21 and each spoke portion 24 attached to the axle. The disc flange portion 25 of the wheel disc 3 can exhibit high proof strength against torsional load. As a result, the effect of suppressing the deformation of the disc flange portion 25 is improved, so that stress concentration acting on the welded portion 9 between the disc flange portion 25 and the well portion 13 of the wheel rim 2 can be reduced. Further, the stress concentration acting on the portion where the spoke portion 24 and the disk flange portion 25 are coupled to each other can be reduced with respect to the bending / twisting load acting via the respective spoke portions 24. In particular, in this configuration, the bent front side edge portion 36 is formed so as to be recessed stepwise toward the back as compared with the outer end portions 32a and 32a of the side edge portions 32 and 32 of the spoke portion 24. The coupled side portions 38 and 38 that couple the bent surface side edge portion 36 and the side edge portions 32 and 32 of the spoke portion 24 form a so-called rib structure. Thereby, the effect which relieves | moderates the stress concentration which acts on the above-mentioned welding part 9 and the stress concentration which acts on the site | part where the spoke part 24 and the disk flange part 25 couple | bond is further improved.

  Here, the effect of improving the strength and rigidity of the disc flange portion 25 of the wheel disc 3 includes a shape effect due to the shape of the bent front side edge portion 36 being bent radially inward, and a stepped recess on the back side. It can be exhibited by the shape effect due to the shape. Therefore, compared with the configuration provided with only one of the above-described shape effects, the configuration of the present embodiment can exhibit high strength and rigidity, and is excellent in the above-described effects.

  For example, as a comparative example, an automobile wheel 101 (see FIG. 10B) in which a disc flange portion 115 of a wheel disc 103 includes a bent edge portion 116 bent inward in the radial direction as shown in FIG. Illustrate. Here, the disc flange portion 115 includes a fitting straight ring portion 117 and a bent edge portion 116 that extends from the front side edge of the fitting straight ring portion 117 and is bent radially inward. The bent edge portion 116 is connected to the outer end portions 32a and 32a of the side edge portions 32 and 32 of the spoke portions 24 and 24 in a substantially uniform manner in the circumferential direction, and is not recessed to the back side. A decorative hole 107 is defined by the side edge portions 32 and 32 of the adjacent spoke portions 24 and 24 and the bent edge portion 116 of the disk flange portion 115. In the configuration of this comparative example, the shape effect by the shape in which the bent edge portion 116 is bent inward is exhibited, and the strength and rigidity of the disk flange portion 115 are improved. However, in the configuration of this comparative example, unlike the configuration of the present embodiment described above, the bent front side edge portion 36 that is recessed in a stepped shape on the back side is not provided, so that the bent edge of the comparative example is not provided. The portion 116 cannot exhibit the same shape effect as that of the bent front side edge portion 36. Therefore, the configuration of the present embodiment can exhibit higher strength and rigidity than the configuration of the above-described comparative example, and can exhibit the above-described effects. Furthermore, in the configuration of the present embodiment, as described above, the coupled side portions 38 and 38 of the bent front side edge portion 36 form a rib structure, and accordingly, the strength and rigidity are improved. As compared with the configuration of the comparative example described above, the dimensional shape (area) of the coupling side portions 38 and 38 can be set small. Along with this, the decoration hole 27 can be formed larger, so that it has an excellent advantage that the design can be improved and the weight can be reduced.

  In addition, the configuration of the present embodiment is such that the bent front side edge portion 36 is formed so as to be recessed in a step shape toward the back as compared with the outer end portion 32a of the side edge portion 32 of the spoke portion 24. The outer end portions (32a, 32a) of the 24 side edge portions 32, 32 can be made to appear to float upward. Thereby, since the effect which makes each spoke part 24 look long along the longitudinal direction (radial direction) can be produced, the designability of the surface of the said wheel 1 for motor vehicles can be improved.

  Furthermore, in the configuration of the present embodiment, since the bent front side edge portion 36 that forms the outer hole edge of the decorative hole 27 is recessed backward, for example, as shown in FIG. When the wheel cap 91 is attached to the wheel cap 91, the design freedom of the shape of the wheel cap 91 is improved. Here, the wheel cap 91 is configured to include an opening 92 that opens to cover the peripheral edge of each decorative hole 27 of the automobile wheel 1. In the case of the configuration shown in FIG. 10A, the outer edge 92 a of the opening 92 is formed so as to be close to the inner edge 36 a of the bent front edge 36 of the wheel disk 3 that defines the decorative hole 27. Has been. Thereby, the opening area of the opening 92 is made as large as possible. On the other hand, FIG. 10B shows a state in which the wheel cap 121 provided with the opening 122 is similarly attached to the automobile wheel 101 (see FIG. 13) having the configuration of the above-described comparative example. Comparing the opening 122 of the wheel cap 121 shown in FIG. 10B with the opening 92 of the wheel cap 91 of this configuration shown in FIG. 10A, the outer edge 92a of the opening 92 of this configuration is As compared with the outer edge 122a of the opening 122 of the comparative example, the angle inclined to the back is larger. As a result, the opening 92 of this configuration has a larger opening area than the opening 122 of the comparative example. Therefore, the wheel cap 91 of this configuration can exhibit high designability compared to the configuration of the comparative example. That is, the automobile wheel 1 of the present embodiment shown in FIGS. 2 and 10A is compared with the configuration of the comparative example shown in FIGS. 10B and 13 even when the wheel cap 91 is attached. And has an excellent advantage of exhibiting high design properties. This is an operational effect of the present embodiment provided with the bent front side edge portion 36 that is recessed backward on the wheel disk 3. Even in the configuration of the present embodiment, the wheel cap 121 similar to that of the comparative example can be attached. This means that the degree of freedom in designing the shape of the wheel cap is improved compared to the configuration of the comparative example.

  As another example of the above-described embodiment, as in the wheel disk 53 shown in FIG. 11, the outer end portions 62a and 62a of the side edge portions 62 and 62 of the spoke portion 54 are substantially linear and substantially outward. It can also be set as the structure formed so that it might extend in parallel. The outer end portions 62a and 62a of the side edge portions 62 and 62 and the bent front side edge portion 56 formed on the disc flange portion 55 are coupled via curved coupled side portions 58 and 58, respectively. Yes. Even in the configuration shown in FIG. 11, the bent front side edge portion 56 is behind the outer end portion 62 a of the side edge portion 62 of the spoke portion 54, as in the embodiment shown in FIGS. It is formed so as to be recessed in a step shape. The inner end edge 56a and the outer end edge 56b of the bent front side edge portion 56 are formed so as to be recessed stepwise toward the back as compared with the outer end 62b of the side edge portion 62 of the spoke portion 54, respectively. The configuration of such another example (configuration of FIG. 11) is such that the outer end portions 62a and 62a of the side edge portions 62 and 62 of the spoke portion 54 are wider than the configuration of the above-described embodiment (configuration of FIG. 9). The structure is the same except that the structure is not, and the same components are denoted by the same reference numerals and the description thereof is omitted. In the case of the configuration of this other example (configuration of FIG. 11), the strength and rigidity exhibited by the outer end portions 62a and 62a of the side edge portions 62 and 62 of the spoke portion 54 are the same as the configuration of the above-described embodiment (FIG. 9). However, due to the shape effect of the bent front side edge portion 56, it can be exhibited higher than the configuration of the comparative example described above (configuration of FIG. 13). Therefore, even in the configuration of this other example (configuration of FIG. 11), the same operational effects as the configuration of the above-described embodiment (configuration of FIG. 9) can be obtained.

  As another example, like the wheel disc 73 shown in FIG. 12, the outer end portions 82a and 82a of the side edge portions 82 and 82 of the spoke portion 74 are formed in a shape that tapers in a substantially straight line toward the outside. It is also possible to adopt a configuration. Here, the outer end portions 82a and 82a of the side edge portions 82 and 82 and the bent front side edge portion 76 formed on the disc flange portion 75 are coupled via curved coupled side portions 78 and 78. Yes. Even in the configuration shown in FIG. 12, the bent front side edge portion 76 is recessed stepwise toward the back as compared with the outer end portion 82 a of the side edge portion 82 of the spoke portion 74, as in the above-described embodiment. Is formed. The inner end edge 76a and the outer end edge 76b of the bent front side edge portion 76 are formed so as to be recessed stepwise toward the back as compared with the outer end 82b of the side edge portion 82 of the spoke portion 74, respectively. Even in such another configuration (configuration shown in FIG. 12), the above-described comparison is made by the shape effect of the bent front side edge portion 76 in the same manner as the configuration (shape shown in FIG. 11) that extends substantially in parallel. High strength and rigidity can be exhibited as compared with the configuration of the example (configuration of FIG. 13). Therefore, even in the configuration of this other example (configuration of FIG. 12), the same operational effects as the configuration of the above-described embodiment (configuration of FIG. 9) can be obtained.

  On the other hand, in the above-described embodiment, the coupled side portions 38 and 38 of the bent front side edge portion 36 are formed in a curved shape. As another configuration, for example, the coupled side portion is substantially omitted. It can also be set as the shape which inclines linearly, and the substantially linear shape along the front and back direction. Regardless of the configuration, the bent side edge portion is formed in a stepped shape by the coupled side portion, so that the same effects as those of the above-described embodiment can be achieved.

  In addition, the automobile wheel of the present embodiment described above has a configuration having five spoke portions, but is not limited to this, and has a plurality of spoke portions such as three, four, six, and seven. It is good also as a structure provided.

  In addition, in the automobile wheel of the present embodiment described above, the wheel rim formed by processing a steel flat plate and the wheel disc are joined together, and the wheel rim and the wheel disc are formed using an aluminum alloy flat plate. It is good also as the structure which shape-processed. Furthermore, it can be formed using a flat plate such as a magnesium alloy or a titanium alloy. Further, the wheel rim and the wheel disc may be formed from different types of metal flat plates.

  In this invention, it is not limited to the Example mentioned above, About another structure, it can change suitably within the range of the meaning of this invention. For example, the spoke portion may have a shape different from that of the above-described embodiment.

DESCRIPTION OF SYMBOLS 1 Automobile wheel 2 Wheel rim 3, 53, 73 Wheel disc 12a Front side bead seat part 12b Back side bead seat part 13 Well part 21 Hub attachment part 24, 54, 74 Spoke part 25, 55, 75 Disc flange part 27 Decoration Hole 32, 62, 82 Side edge portion 32a, 62a, 82a Outer end portion 32b, 62b, 82b Outer end 36, 56, 76 Bending front side edge portion 36a, 56a, 76a Inner end edge 36b, 56b, 76b Outer end edge 38, 58, 78 coupled side

Claims (3)

A wheel rim comprising front and back bead seat portions that support the bead of the tire, and a well portion recessed inward provided between the front and back bead seat portions;
A substantially disc-shaped hub mounting portion connected to the hub of the axle, an annular disk flange portion fitted in the well portion of the wheel rim, and a plurality of spoke portions connecting the hub mounting portion and the disk flange portion In an automobile wheel comprising a wheel disc in which a decorative hole is defined by an adjacent spoke portion and a disc flange portion,
The disc flange portion of the wheel disc extends between adjacent spoke portions from a fitting straight ring portion that fits into the well portion of the wheel rim and a portion that is not coupled to the spoke portion of the fitting straight ring portion. And is bent radially inward, and has a concentric arc-shaped bent front side edge that is recessed backward compared to the outer end of the side edge of the spoke part,
Furthermore, the bending front side edge portion has a bending angle between the bending front side edge portion and the fitting straight ring portion of 45 degrees or more and 90 degrees or less.   2. The automobile wheel according to claim 1, wherein the bent front side edge portion of the disk flange portion is formed so as to be recessed stepwise toward the back as compared with the outer end portion of the side edge portion of the spoke portion. .   2. The disk flange portion is provided with curved coupled side portions that couple the bent surface side edge portion and the spoke portion on both sides in the circumferential direction of the bent surface side edge portion. Or the wheel for motor vehicles of Claim 2.