Vehicle Wheels

Abstract

To provide a vehicular wheel capable of improving aerodynamic performance when a vehicle travels while suppressing increases in manufacturing cost and weight.SOLUTION: A rim section 12 of a vehicular wheel 1 has an outer flange section 122. An area of the outer flange section 122 where a space section 13 between spoke parts 11 is located on the radially inner side is provided with a first inclined surface and a second inclined surface. The first inclined surface is formed on the axially outer side of an outer flange outer circumference section 122a. The second inclined surface is formed on the axially outer side of an outer flange inner circumference section 122b. The first inclined surface is formed so that it inclines from the axially outer side to the axially inner side as it goes from the end of the radially outer side to the radially inner side. The second inclined surface is a surface formed so that it inclines from the axially inner side to the axially outer side as it goes from the radially outer side to the radially inner side and extends to the radially inner side from a well section 121.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a vehicle wheel. [Background technology]

[0002] For automobiles and other vehicles, there is a demand to further reduce the Cd value (air resistance coefficient) in order to improve fuel efficiency or electricity consumption. To reduce the Cd value, various devices such as spoilers, deflectors, and undercovers have been considered. In addition, while the vehicle is moving, the wheels disturb the air flow, so in order to further reduce the Cd value, it is also important to reduce the air resistance caused by the wheels.

[0003] A wheel of a vehicle has a center disk portion attached to a hub of a vehicle body, a cylindrical rim portion formed coaxially with the center disk, and spoke portions connecting the center disk portion and the rim portion. A plurality of spoke portions are provided in the circumferential direction for cooling the brakes arranged on the inner side of the center disk portion of the wheel in the vehicle width direction and for cooling the tires mounted on the wheel, and spaces are formed between adjacent spoke portions in the circumferential direction. It is known that when a vehicle is traveling, air flows in and out of the wheel house through the spaces between the spokes of the wheel, disrupting the air flow and creating resistance.

[0004] Specifically, as shown in Fig. 8, the rim portion of the wheel is formed of an outer flange portion 922 provided in a ring shape on the outer side in the vehicle width direction, an inner flange portion (not shown) provided in a ring shape on the inner side in the vehicle width direction, and a cylindrical well portion 921 provided between the outer flange portion 922 and the inner flange portion. During vehicle travel, in the wheel according to the conventional technology, air E1 flowing outside the outer flange portion 922 flows along the outer surface of the inner peripheral portion of the outer flange portion 922, some of which flows rearward (arrow E2), while some of the air flows from the space portion toward the inside of the wheel house (arrow E3). The air E3 that has flowed inward through the space portion in this way collides with the hub and the inside of the wheel, creating resistance.

[0005] A technology that attempts to rectify the air flow at the wheel while such a vehicle is running has been studied (Patent Document 1). Patent Document 1 discloses a configuration in which an annular outer member is attached to the outside of the wheel. The outer member disclosed in Patent Document 1 has a structure that can block part of the space between the spokes of the wheel, specifically, the radially outer area of ​​the space. It is believed that the technology disclosed in Patent Document 1 can prevent air from entering or exiting through the space by attaching the outer member to the wheel. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2020-179746 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, the technology disclosed in the above-mentioned Patent Document 1 requires an outer member in addition to the wheel, which increases the number of parts and therefore increases costs.In addition, since the outer member needs to be assembled to the wheel, the number of operations in the manufacturing process increases, which also increases manufacturing costs.

[0008] Here, in order to reduce the air resistance at the wheel when the vehicle is traveling, it is possible to reduce the space between the spokes.

[0009] However, because wheels are made of metal, making the space smaller requires an increased amount of metal, which leads to an increase in the weight of the wheel, and therefore does not improve fuel economy or electricity consumption.

[0010] The present invention has been made to solve the above-mentioned problems, and has an object to provide a vehicle wheel that can improve the aerodynamic performance when the vehicle is running while suppressing increases in manufacturing costs and weight. [Means for solving the problem]

[0011] A vehicle wheel according to one aspect of the present invention comprises a center disc portion, a rim portion, and a plurality of spoke portions. The center disc portion is a portion that is attached to a vehicle hub. The rim portion is a cylindrical portion that is disposed radially outwardly of and spaced from the center disc portion. The plurality of spoke portions connect the center disc portion and the rim portion, and are disposed with spaces between adjacent spoke portions in the circumferential direction.

[0012] In the vehicle wheel according to this aspect, the rim portion has an inner flange portion, an outer flange portion, and a well portion. In the direction in which the central axis of rotation of the vehicle wheel extends, the side where the hub is attached to the center disc portion is the axially inner side, and the side opposite the axially inner side across the center disc portion is the axially outer side. In this case, the inner flange portion is a ring-shaped portion disposed on the axially inner side. Also, the outer flange portion is a ring-shaped portion disposed on the axially outer side. And the well portion is a cylindrical portion integrally formed with the inner flange portion and the outer flange portion so as to connect between the inner flange portion and the outer flange portion.

[0013] A first inclined surface and a second inclined surface are provided in a region of the outer flange portion where the space portion is disposed radially inward. The first inclined surface is a surface on the axially outer side, and is formed so as to incline from the axially outer side toward the axially inner side as it moves from the radially outer end of the outer flange portion to the radially inner side. The second inclined surface is a surface on the axially outer side, and is connected to the radially inner end of the first inclined surface, and is formed so as to incline from the axially inner side toward the axially outer side as it moves from the radially outer side to the radially inner side from the connection point, and to extend radially inward beyond the well portion. In the above, when assuming a first imaginary plane perpendicular to the central axis of rotation, the first inclined surface and the second inclined surface are formed so that the angle that the first inclined surface makes with respect to the first imaginary surface is larger than the angle that the second inclined surface makes with respect to the first imaginary surface.

[0014] In the vehicle wheel according to the above aspect, in the region where the space is arranged on the radial inside, a first inclined surface and a second inclined surface are provided on the axial outside of the outer flange portion of the rim portion. The first inclined surface is a surface that inclines from the axial outside to the axial inside as it goes from the radial outside to the radial inside. The second inclined surface is a surface connected to the first inclined surface, and is a surface that inclines from the axial inside to the axial outside as it goes from the radial outside to the radial inside. When a vehicle equipped with the vehicle wheel according to this aspect runs, air flowing from the front of the vehicle tries to enter the axial inside of the vehicle wheel through the space between the spoke portions, but since the second inclined surface is provided on the outer flange portion, the air is guided by the second inclined surface and discharged toward the axial outside (outside in the vehicle width direction).

[0015] Furthermore, on the rear side of the rotational axis of the vehicle wheel, air flowing in from the front of the vehicle attempts to enter the wheel house between the rear end portion of the wheel and the wheel arch, but since the outer flange portion is provided with a first inclined surface, the air is guided by the first inclined surface and discharged toward the outside in the axial direction (outside in the vehicle width direction). Therefore, by adopting the vehicle wheel according to the above aspect, it is possible to improve the aerodynamic performance of the vehicle while it is running.

[0016] In addition, in the vehicle wheel according to the above embodiment, the first and second inclined surfaces are provided on the outer flange of the rim portion to improve the aerodynamic performance as described above, and an outer member that is a separate member from the wheel is not attached to the wheel as in the technology disclosed in the above Patent Document 1. In addition, in the vehicle wheel according to the above embodiment, the spaces between the spoke portions in the circumferential direction are not integrally filled with the metal material that constitutes the wheel. Therefore, the vehicle wheel according to the above embodiment can suppress increases in manufacturing costs and increases in the weight of the wheel.

[0018] moreover, In the vehicle wheel according to the above aspect, the angle that the first inclined surface makes with respect to the first imaginary plane is set to be larger than the angle that the second inclined surface makes with respect to the first imaginary plane. Therefore, in the vehicle wheel according to the above aspect, it is even more advantageous for the air flowing from the front of the vehicle, which is attempting to enter the wheel house between the rear end portion of the wheel and the wheel arch, to be guided by the first inclined surface and discharged toward the axially outer side (the outer side in the vehicle width direction) on the vehicle rear side of the rotational center axis of the vehicle wheel.

[0019] In the vehicle wheel according to the above aspect, the outer flange portion may have an outer flange outer peripheral portion and an outer flange inner peripheral portion. The outer flange outer peripheral portion includes the first inclined surface as the axially outer surface, and constitutes the outer peripheral portion of the outer flange portion. The outer flange inner peripheral portion includes the second inclined surface as the axially outer surface, and constitutes the inner peripheral portion of the outer flange portion. In the vehicle wheel according to this aspect, when a second imaginary surface is assumed to be a tangent surface that contacts the outer flange outer peripheral portion and the outer flange inner peripheral portion from the axially outer side, the outer flange outer peripheral portion and the outer flange inner peripheral portion may be formed such that the second imaginary surface forms an angle of 15° or less with respect to the first imaginary surface.

[0020] In the vehicle wheel according to the above aspect, the angle that the second imaginary plane forms with respect to the first imaginary plane is set to be 15° or less. Therefore, the vehicle wheel according to the above aspect is even more advantageous in that the air from the front of the vehicle that tries to enter the axially inner side of the vehicle wheel through the space between the spoke parts is guided by the second inclined surface and discharged toward the axially outer side (outer side in the vehicle width direction).

[0021] In the vehicle wheel relating to the above-mentioned aspect, when the connection portion between the outer flange outer circumferential portion and the outer flange inner circumferential portion is formed as a recessed portion, the outer flange outer circumferential portion and the outer flange inner circumferential portion may be formed so that the depth of the recessed portion based on the second imaginary plane is 15 mm or less.

[0022] In the vehicle wheel according to the above aspect, the depth of the recessed portion based on the second imaginary plane is set to 15 mm or less. Therefore, in the vehicle wheel according to the above aspect, when the air flowing along the first inclined surface portion changes direction to follow the second inclined surface portion, and when the air flowing along the second inclined surface portion changes direction to follow the first inclined surface portion, the air is less likely to stagnate in the recessed portion. Therefore, in the vehicle wheel according to the above aspect, it is possible to suppress the generation of vortexes of air in and near the recessed portion, which is further advantageous in improving the aerodynamic performance of the vehicle.

[0023] In the vehicle wheel relating to the above-mentioned aspect, the axially outer surface of the recessed portion may be formed with a curved surface, and the first inclined surface and the second inclined surface may be connected via the curved surface of the recessed portion.

[0024] In the vehicle wheel according to the above aspect, the surface on the axially outer side of the recess is formed with a curved surface. The first inclined surface and the second inclined surface are connected via the curved surface of the recess. Therefore, in the vehicle wheel according to the above aspect, the air flowing along the first inclined surface can be smoothly redirected so that it flows along the second inclined surface, and the air flowing along the second inclined surface can be smoothly redirected so that it flows along the first inclined surface, which is further advantageous in improving the aerodynamic performance of the vehicle.

[0025] In the vehicle wheel according to the above aspect, the outer flange outer peripheral portion may be formed so as to extend axially outwardly beyond the outer flange inner peripheral portion.

[0026] In the vehicle wheel according to the above aspect, the outer flange outer periphery is formed to extend further axially outward than the outer flange inner periphery. Therefore, air flowing in from the front of the vehicle can be discharged axially outward (outward in the vehicle width direction) by the outer flange outer periphery, which is the radially outer side of the vehicle wheel. Therefore, the vehicle wheel according to the above aspect is more advantageous in preventing air flowing in from the front of the vehicle from entering the inside of the wheel house through the space between the spokes.

[0027] In the vehicle wheel according to the above aspect, the center disc portion, the rim portion, and the plurality of spoke portions may be integrally formed using a metallic material.

[0028] In the vehicle wheel according to the above embodiment, the center disk portion, the rim portion, and the spoke portions are integrally formed using a metal material. Therefore, there is no misalignment between the center disk portion, the rim portion, and the spoke portions, and high dimensional accuracy can be achieved. In addition, by integrally forming the center disk portion, the rim portion, and the spoke portions, the vehicle wheel according to the above embodiment can ensure higher rigidity than two-piece or three-piece vehicle wheels. Effect of the Invention

[0029] The vehicle wheels according to the above aspects can improve the aerodynamic performance when the vehicle is running while suppressing increases in manufacturing costs and weight. [Brief description of the drawings]

[0030] [Figure 1] 1 is a perspective view showing an external configuration of a vehicle wheel according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a plan view showing the external configuration of the vehicle wheel. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 4 is an enlarged view showing a portion A in FIG. 3. [Diagram 5] FIG. 2A is a cross-sectional view showing the air flow at the front part of a vehicle wheel, and FIG. 2B is a cross-sectional view showing the air flow at the rear part of the vehicle wheel. [Figure 6] 1 is a cross-sectional view showing a portion of a vehicle wheel with a tire mounted thereon; [Figure 7] Graph (a) is a graph showing the relationship between the opening area and ΔE, graph (b) is a graph showing the relationship between the recess depth and ΔE, and graph (c) is a graph showing the relationship between the inclination angle and ΔE. [Figure 8] 1 is a cross-sectional view showing air flow in a vehicle wheel according to the prior art; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example of the present invention, and the present invention is not limited to the following embodiment except for the essential configuration.

[0032] 1. Appearance of vehicle wheel 1 The external configuration of a vehicle wheel 1 according to an embodiment of the present invention will be described with reference to Figs.

[0033] 1 and 2, the vehicle wheel 1 has a center disc portion 10, a plurality of spoke portions 11, and a rim portion 12 integrally formed using a metal material (for example, an aluminum alloy (including ultra-super duralumin) or a magnesium alloy). The center disc portion 10 is a portion that is attached to a vehicle hub, and has a plurality of bolt holes 101.

[0034] The multiple spoke portions 11 are provided so as to extend radially and connect the center disc portion 10 and the rim portion 12. As shown in Fig. 2, a space portion 13 is provided between the spoke portions 11 adjacent to each other in the circumferential direction.

[0035] The rim portion 12 has a well portion 121, an outer flange portion 122, and an inner flange portion 123. The outer flange portion 122 and the inner flange portion 123 each have a ring shape. The well portion 121 is a cylindrical portion formed integrally with the inner flange portion 123 and the outer flange portion 122 so as to connect between the inner flange portion 123 and the outer flange portion 122.

[0036] As shown in Figure 3, in this specification, in the direction in which the rotational center axis Ax1 of the vehicle wheel 1 extends, the side of the mounting surface 102 where the vehicle hub is attached to the center disc portion 10 is defined as the axially inner side, and the side opposite the axially inner side across the center disc portion 10 is defined as the axially outer side.

[0037] 2. Shape of outer flange portion 122 The shape of the region of the outer flange portion 122 where the space portion 13 is disposed radially inward will be described with reference to Figures 3 and 4. Figure 4 is an enlarged cross-sectional view of part A in Figure 3.

[0038] As shown in Fig. 3, the outer flange portion 122 has an outer flange outer peripheral portion 122a and an outer flange inner peripheral portion 122b that are integrally formed with each other. As shown in the cross section of Fig. 4, the outer flange outer peripheral portion 122a is a portion that extends radially outward and axially outward from the axially outer end of the well portion 121. The outer flange inner peripheral portion 122b is a portion that branches off from the axially outer end of the well portion 121, and extends radially inward and axially inward.

[0039] As shown in Fig. 4, a tangent surface (first imaginary surface Sv1) is assumed that is tangent to the radially outer end of the outer flange outer peripheral portion 122a and perpendicular to the central axis of rotation Ax1 (see Fig. 3). In this case, a surface (first inclined surface 122d) on the radially inner side and axially outer side of the outer flange outer peripheral portion 122a is inclined at an angle θd with respect to the first imaginary surface Sv1. More specifically, the first inclined surface 122d is a surface formed so as to incline from the axially outer side toward the axially inner side as it moves from the radially outer end Pd1 toward the radially inner end Pd2.

[0040] Moreover, the surface (second inclined surface 122e) on the radially outer side and the axially outer side of the outer flange inner peripheral portion 122b is inclined to form an angle θe with respect to the first imaginary plane Sv1. More specifically, the second inclined surface 122e is a surface formed so as to incline from the axially inner side toward the axially outer side as it moves from the radially outer end Pe1 to the radially inner end Pe2.

[0041] The angles θd and θe satisfy the following relationship. θd>θe (Formula 1) Between the outer flange outer peripheral portion 122a and the outer flange inner peripheral portion 122b, a recessed portion 122c is interposed, which is formed so as to be recessed toward the inside in the axial direction. The surface of the recessed portion 122c on the outer side in the axial direction is formed as a curved surface. The first inclined surface 122d and the second inclined surface 122e are connected via the curved surface of the recessed portion 122c. The end portion Pe1 of the second inclined surface 122e corresponds to a connection portion connected to the first inclined surface 122d via the curved surface of the recessed portion 122c.

[0042] Next, assume a surface (second virtual surface Sv2) that contacts from the outer axial direction with respect to the radially outer end of the outer flange outer peripheral portion 122a and the radially inner end of the outer flange inner peripheral portion 122b. In this case, the first virtual surface Sv1 and the second virtual surface Sv2 intersect at an angle θ. In the present embodiment, the angle θ satisfies the following relationship. θ ≦ 15° ··(Equation 2) As shown in FIG. 4, in the vehicle wheel 1 according to the present embodiment, the outer flange outer peripheral portion 122a is formed to extend axially outward more than the outer flange inner peripheral portion 122b.

[0043] Next, let the outer diameter in the well portion 121 be D1 and the inner diameter of the inner edge end 122f on the radially inner side of the outer flange inner peripheral portion 122b be D2. In this case, the outer diameter D1 and the inner diameter D2 satisfy the following relationship. D2 < D1 ··(Equation 3) By satisfying the above relational expression 3, the second inclined surface 122e is also formed to extend radially inward more than the well portion 121.

[0044] The depth L of the recessed portion 122c with respect to the second virtual surface Sv2 is set to satisfy the following relationship. L ≦ 15 mm ··(Equation 4) Note that the depth L of the recessed portion 122c is defined as the straight-line distance between the intersection point P1 and the bottom P2 when a perpendicular line Ln3 is drawn from the recessed portion 122c to the second virtual surface Sv2.

[0045] 3. Air flow in the outer flange portion 122 during vehicle travel The air flow in the outer flange portion 122 during vehicle travel will be described with reference to FIG. 5. Note that FIG. 5(a) is a cross-sectional view showing the air flow in the outer flange portion 122 at the front of the vehicle wheel 1 mounted on the vehicle, and FIG. 5(b) is a cross-sectional view showing the air flow in the outer flange portion 122 at the rear of the vehicle wheel 1.

[0046] As shown in FIG. 5(a), when the vehicle is traveling, air flows from the front of the vehicle to the rear on the axially outer side at the front of the vehicle wheel 1 (arrow B1). Then, a part of the air flowing from the front is guided axially inward along the first inclined surface 122d of the outer flange outer peripheral portion 122a at the front of the vehicle wheel 1. The air guided axially inward along the first inclined surface 122d is redirected axially outward at the recessed portion 122c and guided axially outward (outside in the vehicle width direction) along the second inclined surface 122e. Thus, in the vehicle wheel 1 according to this embodiment, the air flowing from the front is prevented from being drawn into the inside of the vehicle wheel 1 and the wheel house at the front of the vehicle wheel 1.

[0047] Next, as shown in FIG. 5(b), while the vehicle is traveling, at the rear of the vehicle wheel 1, air flows from the front to the rear on the axially outer side (arrow B2). Then, part of the air flowing from the front is guided axially inward along the second inclined surface 122e of the outer flange inner peripheral portion 122b at the rear of the vehicle wheel 1. The air guided axially inward along the second inclined surface 122e is redirected axially outward at the recessed portion 122c and guided axially outward (outside in the vehicle width direction) along the first inclined surface 122d. Thus, in the vehicle wheel 1 according to this embodiment, at the rear of the vehicle wheel 1, the air flowing from the front is discharged toward the vehicle width direction outward, and stagnation of the air flow in the wheel house is suppressed.

[0048] 4. Values ​​related to the shape of the outer flange portion 122 The setting of each value related to the shape of the outer flange portion 122 in the vehicle wheel 1 according to this embodiment will be described with reference to Figs.

[0049] 6, a model is assumed in which a tire 500 is mounted on a vehicle wheel 1 according to this embodiment. When mounted on the vehicle wheel 1, the most expanded position of the outer surface 500a of the tire 500 is designated as P3.

[0050] The various parts of the outer flange portion 122 of the vehicle wheel 1 are as described above.

[0051] In the graph shown in Fig. 7(a), the horizontal axis represents the opening area AR of the space 13 in the vehicle wheel 1 according to this embodiment, and the vertical axis represents the kinetic energy loss ΔE of the air. As shown in Fig. 7(a), the kinetic energy loss ΔE can be reduced as the opening area AR is reduced (arrow C1).

[0052] However, if the opening area AR of the vehicle wheel 1 is reduced, the amount of air supplied to the brakes is also reduced. Therefore, if the opening area AR is made too small, the braking performance is deteriorated. After extensive research, the inventors of the present application have found that in order to ensure braking performance while minimizing the kinetic energy loss ΔE of the air, the opening area AR should be set to 350 to 400 cm. 2 It was concluded that it is preferable to set the opening area AR1 within the range of 380 to 390 cm. 2 The range is.

[0053] Next, in the graph shown in Fig. 7(b), the horizontal axis represents the depth (recess depth) L of the recess 122c in the vehicle wheel 1 according to this embodiment, and the vertical axis represents the kinetic energy loss ΔE of the air. As shown in Fig. 7(b) , the kinetic energy loss ΔE can be reduced as the recess depth L is reduced (arrow C2). As shown in Fig. 7(b) , the graph showing the relationship between the recess depth L and the kinetic energy loss ΔE has a relationship of a multi-order function or an exponential function, rather than a linear function.

[0054] The inventors of the present application conducted extensive research taking into account the graph shown in Figure 7(b) as well as the mass and design of the vehicle wheel 1, and came to the conclusion that in order to minimize the kinetic energy loss ΔE of the air, it is preferable to set the recess depth L to L1 (15 mm or less, more preferably 14 mm or less).

[0055] Next, in the graph shown in Fig. 7(c), the angle (tilt angle) θ between the first virtual plane Sv1 and the second virtual plane Sv2 is plotted on the horizontal axis, and the kinetic energy loss ΔE of the air is plotted on the vertical axis. As shown in Fig. 7(c), the kinetic energy loss ΔE can be reduced as the tilt angle θ is reduced (arrow C3). In the graph shown in Fig. 7(c), the rate of increase of the kinetic energy loss ΔE becomes large when the tilt angle θ exceeds θ1 (15°). For this reason, the inventors of the present application have concluded that in order to reduce the kinetic energy loss ΔE of the air as much as possible, it is preferable to set the tilt angle θ to θ1 (15°) or less.

[0056] 5.Effects In the vehicle wheel 1 according to this embodiment, in the region where the space portion 13 is arranged on the radial inner side, the outer flange portion 122 of the rim portion 12 has a first inclined surface 122d and a second inclined surface 122e on the axial outer side. The first inclined surface 122d is a surface that inclines from the axial outer side toward the axial inner side as it goes from the radial outer side to the radial inner side. The second inclined surface 122e is a surface connected to the first inclined surface 122d with the recessed portion 122c sandwiched therebetween, and is a surface that inclines from the axial inner side toward the axial outer side as it goes from the radial outer side to the radial inner side. When a vehicle equipped with the vehicle wheel 1 runs, air flowing from the front of the vehicle tries to enter the axial inner side of the vehicle wheel 1 through the space portion 13 between the spoke portions 11, but since the second inclined surface 122e is provided on the outer flange portion 122, the air is guided by the second inclined surface 122e and discharged toward the axial outer side (outside in the vehicle width direction).

[0057] Furthermore, on the rear side of the rotational center axis Ax1 of the vehicle wheel 1, air flowing in from the front of the vehicle attempts to enter the wheel house between the rear end portion of the wheel and the wheel arch, but since the first inclined surface 122d is provided on the outer flange portion 122, the air is guided by the first inclined surface 122d and discharged axially outward (outward in the vehicle width direction). Therefore, by adopting the vehicle wheel 1 according to this embodiment, it is possible to improve the aerodynamic performance when the vehicle is traveling.

[0058] Moreover, in the vehicle wheel 1, the first inclined surface 122d and the second inclined surface 122e are provided on the outer flange portion 122 of the rim portion 12 to improve the aerodynamic performance as described above, and an outer member that is a separate member from the wheel is not attached to the wheel as in the technology disclosed in the above-mentioned Patent Document 1. Moreover, in the vehicle wheel 1, the space 13 between the spoke portions 11 in the circumferential direction is not integrally filled with the metal material that constitutes the wheel 1. Therefore, in the vehicle wheel 1, it is possible to suppress an increase in manufacturing costs and an increase in the weight of the wheel.

[0059] Furthermore, in the vehicle wheel 1 according to this embodiment, the angle θd that the first inclined surface 122d makes with respect to the first imaginary plane Sv1 is set to be larger than the angle θe that the second inclined surface 122e makes with respect to the first imaginary plane Sv1. For this reason, in the vehicle wheel 1, on the vehicle rear side of the rotation central axis Ax1 of the vehicle wheel 1, air flowing from the front of the vehicle and attempting to enter the wheel house between the rear end portion of the wheel and the wheel arch is guided by the first inclined surface 122d and discharged toward the axially outer side (outer side in the vehicle width direction).

[0060] Furthermore, in the vehicle wheel 1 according to this embodiment, the angle that the second imaginary plane Sv2 forms with respect to the first imaginary plane Sv1 is set to be 15° or less. Therefore, the vehicle wheel 1 is even more advantageous in that the air from the front of the vehicle that tries to enter the axially inner side of the vehicle wheel 1 through the space 13 between the spoke portions 11 is guided by the second inclined surface 122e and discharged toward the axially outer side (outside in the vehicle width direction).

[0061] Moreover, in the vehicle wheel 1 according to this embodiment, the depth L of the recessed portion based on the second imaginary plane Sv2 is set to be 15 mm or less (more preferably, 14 mm or less). Therefore, in the vehicle wheel 1, when the air flowing along the first inclined surface portion 122d changes direction to follow the second inclined surface portion 122e, and when the air flowing along the second inclined surface portion 122e changes direction to follow the first inclined surface portion 122d, it is possible to prevent the air from stagnating (reducing stagnation) in the recessed portion 122c. Therefore, in the vehicle wheel 1, it is possible to prevent the generation of a vortex of air (disturbance of the air flow) in and near the recessed portion 122c, which is further advantageous in improving the aerodynamic performance of the vehicle.

[0062] In the vehicle wheel 1 according to this embodiment, the axially outer surface of the recess 122c, i.e., the surface connecting the first inclined surface 122d and the second inclined surface 122e, is formed with a curved surface. Therefore, in the vehicle wheel 1, the air flowing along the first inclined surface 122d can be smoothly redirected so that it follows the second inclined surface 122e, and the air flowing along the second inclined surface 122e can be smoothly redirected so that it follows the first inclined surface 122d, which is further advantageous in improving the aerodynamic performance of the vehicle.

[0063] In addition, in the vehicle wheel according to this embodiment, the outer flange outer peripheral portion 122a is formed to extend further axially outward than the outer flange inner peripheral portion 122b. Therefore, air flowing in from the front of the vehicle can be discharged axially outward (outward in the vehicle width direction) by the outer flange outer peripheral portion 122a, which is radially outward of the vehicle wheel 1. Therefore, the vehicle wheel 1 is even more advantageous in preventing air flowing in from the front of the vehicle from entering the inside of the wheel house through the space 13 between the spoke portions 11.

[0064] Furthermore, in the vehicle wheel 1 according to this embodiment, the center disc portion 10, the rim portion 12, and the multiple spoke portions 11 are integrally formed using a metal material. Therefore, there is no misalignment between the center disc portion 10, the rim portion 12, and the multiple spoke portions 11, and high dimensional accuracy can be achieved. Furthermore, by integrally forming the center disc portion 10, the rim portion 12, and the multiple spoke portions 11, the vehicle wheel 1 can ensure higher rigidity than two-piece or three-piece vehicle wheels.

[0065] As described above, the vehicle wheel according to this embodiment can suppress increases in manufacturing costs, and can improve the aerodynamic performance when the vehicle is traveling while suppressing increases in weight.

[0066] [Variations] In the above embodiment, the outer flange portion 122 is formed in a shape in which the angle θd is larger than the angle θe, but the present invention is not limited to this. A vehicle wheel may also be provided that includes an outer flange portion formed in a shape in which the angle θe is larger than the angle θd.

[0067] In the above embodiment, the angle θ between the first imaginary plane Sv1 and the second imaginary plane Sv2 is set to 15° or less. However, in the present invention, the angle θ may exceed 15°.

[0068] In the above embodiment, the depth L of the recess 122c based on the second imaginary plane Sv2 is set to 15 mm or less, but in the present invention, the depth L may exceed 15 mm.

[0069] In the above embodiment, the outer flange outer circumferential portion 122a is formed to extend axially further outward than the outer flange inner circumferential portion 122b, but in the present invention, the outer flange outer circumferential portion and the outer flange inner circumferential portion may extend to the same axial level, or the outer flange inner circumferential portion may extend axially further outward than the outer flange outer circumferential portion.

[0070] In the above embodiment, an example of a vehicle wheel 1 in which a center disc portion 10, a rim portion 12, and a plurality of spoke portions 11 are integrally formed using a metal material is used, but the present invention can also be applied to two-piece or three-piece vehicle wheels. [Explanation of symbols]

[0071] 1 Vehicle wheels 10 Center disk part 11 Spoke section 12 Rim section 13 Space section 121 Well section 122 Outer flange 122a Outer flange outer periphery 122b Inner circumference of outer flange 122c Recess 122d 1st slope 122e 2nd slope 122f Inner edge

Claims

1. A center disk portion that is attached to a vehicle hub; a cylindrical rim portion disposed radially outwardly of the center disk portion at a distance from the center disk portion; a plurality of spoke portions that connect the center disk portion and the rim portion and are arranged with a space between adjacent spoke portions in the circumferential direction; Equipped with In the direction in which the rotational axis of the vehicle wheel extends, the side to which the hub is attached with respect to the center disc portion is defined as the axially inner side, and the side opposite the axially inner side across the center disc portion is defined as the axially outer side. The rim portion is A ring-shaped inner flange portion disposed on the axially inner side; A ring-shaped outer flange portion disposed on the axially outer side; a cylindrical well portion formed integrally with the inner flange portion and the outer flange portion so as to connect the inner flange portion and the outer flange portion; having In the outer flange portion, in a region where the space portion is arranged on the radially inner side, a first inclined surface formed on the axially outer surface so as to incline from the axially outer side toward the axially inner side as the first inclined surface moves from the radially outer end of the outer flange portion to the radially inner side; a second inclined surface that is an axially outer surface, connected to the radially inner end of the first inclined surface, inclined from the axially inner side toward the axially outer side as it moves from the connection point toward the radially inner side, and formed so as to extend to a position radially inner than the well portion; There is a system in place, When a first imaginary plane perpendicular to the central axis of rotation is assumed, the first inclined surface and the second inclined surface are formed such that an angle formed by the first inclined surface with respect to the first imaginary plane is larger than an angle formed by the second inclined surface with respect to the first imaginary plane; Wheels for vehicles.

2. In the vehicle wheel according to claim 1, The outer flange portion is an outer flange outer circumferential portion including the first inclined surface as a surface on the axially outer side and constituting an outer circumferential portion of the outer flange portion; an outer flange inner peripheral portion including the second inclined surface as a surface on the axially outer side and constituting an inner peripheral portion of the outer flange portion; having When a second imaginary surface is assumed to be a tangent surface that contacts the outer peripheral portion of the outer flange and the inner peripheral portion of the outer flange from the axially outer side, The outer flange outer peripheral portion and the outer flange inner peripheral portion are formed such that the second imaginary plane forms an angle of 15° or less with respect to the first imaginary plane. Wheels for vehicles.

3. In the vehicle wheel according to claim 2, When a connection portion between the outer peripheral portion of the outer flange and the inner peripheral portion of the outer flange is a recessed portion, The outer flange outer peripheral portion and the outer flange inner peripheral portion are formed so that a depth of the recessed portion based on the second imaginary plane is 15 mm or less. Wheels for vehicles.

4. In the vehicle wheel according to claim 3, The axially outer surface of the recessed portion is formed with a curved surface, The first inclined surface and the second inclined surface are connected via a curved surface of the recessed portion. Wheels for vehicles.

5. A vehicle wheel according to any one of claims 2 to 4, The outer flange outer peripheral portion is formed so as to extend further outward in the axial direction than the outer flange inner peripheral portion. Wheels for vehicles.

6. The vehicle wheel according to any one of claims 1 to 5, The center disk portion, the rim portion, and the plurality of spoke portions are integrally formed using a metal material. Wheels for vehicles.

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