Wheel structure for vehicle

Abstract

To provide a vehicular wheel structure which enhances the rigidity of a wheel fastening part to a hub and improves the maneuverability of a vehicle.SOLUTION: A vehicular wheel 10 comprises: a center disc part 13, fastened to a hub unit 20 of a vehicle 1, where a plurality of fastening holes 15 are formed; a contact part P, provided on the inner side of the center disc part 13, and projecting by a predetermined quantity from a datum level with the hub unit 20 at a position separated by a predetermined distance from the opening 15a of a fastening hole 15 first to contact a hub side fastening face 20a; and a wheel side fastening face 17a that makes a surface contact with the hub side fastening face 20a in the datum level when the opening 15a of the fastening hole 15 is formed and a fastening member 18 inserted into the fastening hole and a non-fastening member 22 are fastened by means of a set predetermined fastening torque T.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a wheel structure for a vehicle which is fastened to a hub connected to an axle. [Background technology]

[0002] A vehicle is provided with four tires, front, rear, left and right, and the wheels into which these tires are fitted are fastened to hubs connected to the axles of a driving shaft or a driven shaft. For example, Patent Document 1 discloses a technology for increasing the rigidity of a wheel disc for a vehicle by using a pressing portion, such as a circular arc portion, that protrudes toward the hub. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-218039 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional wheel structures, there is a problem in that surface pressure is concentrated around the fastening holes of the bolts, and the entire fastening surfaces of the wheel and hub cannot be fastened with uniform surface contact. In addition, as described in Patent Document 1, a pressing part structure such as a circular arc part protruding toward the hub has been proposed, but even with this structure, there are places where the pressing part hits hard locally.

[0005] Such uneven surface pressure on the fastening surfaces of the wheel and hub reduces the rigidity of the fastening portion of the wheel, posing a problem of degrading the vehicle's driving performance.

[0006] SUMMARY OF THE PRESENT DISCLOSURE In view of the above, an object of the present invention is to provide a vehicle wheel structure which increases the rigidity of the fastening portion of the wheel to the hub, thereby improving the driving performance of the vehicle. [Means for solving the problem]

[0007] A vehicle wheel according to one aspect of the present invention structure a vehicle wheel structure which is fastened to a hub unit of a vehicle and has an inner and outer diameters in a vehicle width direction, the vehicle wheel structure comprising: a center disk portion in which a plurality of disk portions are radially extended in an outer diameter direction and in which a center bore and a plurality of fastening holes are formed; a contact portion which is provided on the inner side of the center disk portion and protrudes a predetermined amount from a reference surface when fastening to the hub unit at a position spaced a predetermined distance from an opening of the fastening hole and which first contacts a hub-side fastening surface; and a fastening member which is provided on the inner side of the center disk portion and has the opening and is inserted into the fastening hole. covered and a wheel-side fastening surface that comes into surface contact with the hub-side fastening surface at the reference surface when the fastening member is tightened with a predetermined fastening torque. The wheel-side fastening surface is a tapered surface having a predetermined angle and a rough surface with a predetermined depth set thereon, and the rough surface has a depth set to the same amount as a protrusion amount of the contact portion from the reference surface. Another aspect of the vehicle wheel structure of the present invention is a vehicle wheel structure that is fastened to a hub unit of a vehicle and has an inner and outer diameters defined in the vehicle width direction, the vehicle wheel structure comprising: a center disk portion having a plurality of disk portions extending radially in an outer diameter direction, a center bore and a plurality of fastening holes formed therein; an abutment portion provided on the inner side of the center disk portion, protruding a predetermined amount from a reference surface when fastening to the hub unit at a position spaced a predetermined distance from the opening of the fastening hole and first abutting against the hub-side fastening surface; and a wheel-side fastening surface provided on the inner side of the center disk portion, having the opening, and coming into surface contact with the hub-side fastening surface at the reference surface when a fastening member inserted into the fastening hole and a fastened member are tightened with a predetermined fastening torque, the wheel-side fastening surface being a tapered surface having a predetermined angle on which a rough surface having a predetermined depth is formed, and the depth of the rough surface is set so that the depth of the rough surface becomes shallower from the abutment portion toward the center disk portion so that the rough surface changes from coarse to dense. Effect of the Invention

[0008] The vehicle wheel structure of the present invention can increase the rigidity of the fastening portion of the wheel to the hub, thereby improving the driving performance of the vehicle. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing a configuration of a vehicle according to a first embodiment; [Diagram 2] FIG. 1 is a partial cross-sectional view of the hub unit with a wheel attached thereto. [Diagram 3] FIG. 2 is a plan view showing the configuration of the outer side of the wheel according to the first embodiment; [Figure 4] FIG. 2 is a plan view showing the inner side configuration of the wheel according to the first embodiment; [Diagram 5] FIG. 13 shows the configuration of a fastening protrusion provided on the inner side of a center disc portion of a vehicle wheel according to the first embodiment. [Figure 6] FIG. 6 is a cross-sectional view showing the configuration of a fastening protrusion of the vehicle wheel provided on the inner side of the center disc portion taken along line VI-VI of FIG. [Figure 7]FIG. 11 is a partial cross-sectional view showing a state in which a vehicle wheel is mounted on the hub unit according to the first embodiment. [Figure 8] FIG. 3 is a partial cross-sectional view showing a state in which a vehicle wheel is fastened to the hub unit according to the first embodiment. [Figure 9] FIG. 13 is a diagram showing a configuration of a fastening protrusion of a vehicle wheel provided on the inner side of a center disc portion of a second embodiment; [Figure 10] FIG. 10 is a cross-sectional view showing the configuration of a fastening protrusion of a vehicle wheel provided on the inner side of a center disc portion taken along line XX in FIG. [Figure 11] FIG. 11 is a partial cross-sectional view showing a state in which a vehicle wheel is mounted on the hub unit according to the first embodiment. [Figure 12] FIG. 3 is a partial cross-sectional view showing a state in which a vehicle wheel is fastened to the hub unit according to the first embodiment. [Figure 13] FIG. 13 is a diagram showing a configuration of a fastening protrusion of a vehicle wheel provided on the inner side of a center disc portion of a third embodiment; [Figure 14] FIG. 14 is a cross-sectional view showing the configuration of a fastening protrusion of a vehicle wheel provided on the inner side of a center disc portion, taken along line XIV-XIV in FIG. [Figure 15] FIG. 11 is a partial cross-sectional view showing a state in which a vehicle wheel is mounted on the hub unit according to the first embodiment. [Figure 16] FIG. 3 is a partial cross-sectional view showing a state in which a vehicle wheel is fastened to the hub unit according to the first embodiment. [Figure 17] FIG. 13 is a plan view showing the configuration of the inner side of the center disk portion of the fourth embodiment; [Figure 18] FIG. 18 is a cross-sectional view showing the configuration of the center disk portion of the vehicle wheel taken along line XVIII-XVIII of FIG. [Figure 19] FIG. 3 is a partial cross-sectional view showing the configuration of a center disk portion of the vehicle wheel according to the first embodiment. [Figure 20] FIG. 11 is a partial cross-sectional view showing a state in which a vehicle wheel is mounted on the hub unit according to the first embodiment. [Figure 21] FIG. 3 is a partial cross-sectional view showing a state in which a vehicle wheel is fastened to the hub unit according to the first embodiment. [Figure 22]FIG. 11 is a partial cross-sectional view showing the configuration of a center disk portion of a vehicle wheel according to a modified example of the first embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Note that in the drawings used in the following description, each component is shown at a different scale so that the components can be recognized on the drawings, and the present invention is not limited to the number of components, the shapes of components, the size ratios of the components, and the relative positional relationships of the components shown in these drawings. (First embodiment)

[0011] As shown in Fig. 1, a vehicle 1 is provided with a plurality of wheels 2 on the front, rear, left and right sides, and in this case, since it is a passenger car, four wheels 2. As shown in Fig. 2, the wheels 2 are fastened to a hub unit 20 provided with a brake rotor 25 connected to an axle, which is the rotating shaft of a drive shaft or a driven shaft.

[0012] 2 to 4, one wheel 2 is configured to have a tire 3 whose main material is rubber, and a metal vehicle wheel (hereinafter simply referred to as wheel) 10 on whose outer periphery the tire 3 is fitted. Note that the wheel 10 here is exemplified as a so-called aluminum wheel made of an aluminum alloy.

[0013] The wheel 10 is configured to have a rim portion 11, multiple, here five, disc portions 12, a center disc portion 13, a center bore 14, multiple, here five, bolt holes 15 which are fastening holes, and multiple, here five, fastening protrusions 17 as protrusions provided on the inner side of the center disc portion 13.

[0014] The disk portion 12 is a so-called spoke that extends radially from a center disk portion 13. The center bore 14 is a hole portion with which a center hub 21 that protrudes from the center of the hub unit 20 is engaged.

[0015] The five bolt holes 15 penetrate the center disc portion 13 and have an inward flange midway against which a wheel nut 18, described below, abuts. Bolt screws 22, which are fastening members erected from the outer surface 20a of the hub unit 20, are inserted into these five bolt holes 15, and the wheel nut 18, which is a fastening member, is screwed into the bolt screws 22 with a predetermined fastening torque set forth therein, thereby fastening the wheel 10 to the hub unit 20.

[0016] Each fastening protrusion 17 is formed with an opening surface 15a which is the opening of the bolt hole 15, and as shown in FIG. 5, the inner surface 17a which serves as the wheel side fastening surface, which is the surface seen from the inner side of the center disc portion 13, protrudes so as to be fan-shaped.

[0017] When the wheel 10 is fastened to the hub unit 20, each inner surface 17a of the fastening protrusion 17 becomes a surface contact portion that faces and comes into contact with an outer surface 20a of the hub side fastening surface, which is the surface of the hub unit 20. Here, the outer surface 20a becomes the surface of the brake rotor 25.

[0018] 6, each inner surface 17a is processed by cutting or the like on the inner side of fastening protrusion 17 so that it has a predetermined angle θ toward hole axis O of bolt hole 15 and is a mortar-shaped inclined surface with a minute predetermined depth α of, for example, about 0.01 to 0.1 mm. That is, each inner surface 17a is a tapered surface in which the outer circumferential edge protrudes by the predetermined amount α toward the outside, away from opening surface 15a of bolt hole 15, and the thickness increases slightly.

[0019] In addition, the opening surface 15a of the bolt hole 15 has a tapered surface which serves as the reference position (reference surface) of the fastening surfaces of the fastening protrusion 17 and the hub unit 20 when the wheel nut 18 is tightened with a specified fastening torque set by the bolt screw 22 and the wheel 10 is properly attached to the hub unit 20.

[0020] When the wheel 2 of the wheel 10 mounted on the vehicle 1 configured as described above is assembled to the hub unit 20, as shown in Figure 7, the outer peripheral edge P of the inner surface 17a protruding toward the inner side at a position spaced a predetermined distance from the bolt hole 15 of each fastening protrusion 17 becomes the abutment portion that first abuts against the outer surface 20a of the hub unit 20.

[0021] The wheel 10 has the wheel nuts 18 fastened to the bolt screws 22 inserted into the bolt holes 15 with a predetermined fastening torque T. Then, as shown in Fig. 8, the wheel 10 deforms so that the fastening protrusions 17 open outward, and the inner surface 17a gradually becomes parallel to the outer surface 20a, and comes into surface contact with the outer surface 20a.

[0022] At this time, in each fastening protrusion 17, the reference position (reference surface) where the inner surface 17a comes into surface contact with the outer surface 20a over a wide area becomes the opening surface 15a of the bolt hole 15.

[0023] This prevents the outer surface 20a of each fastening protrusion 17 from locally contacting the outer surface 20a of the wheel 10, and allows the outer surface 20a to widely contact the outer surface 20a, thereby expanding the contact area. In other words, the entire fastening surface formed by the inner surface 17a of the wheel 10 and the outer surface 20a of the hub unit 20 can be uniformly fastened without surface pressure concentrating around the bolt hole 15 of the fastening hole into which the bolt screw 22 is inserted.

[0024] Therefore, there is no imbalance in the surface pressure on the fastening surfaces of the wheel 10 and the hub unit 20, the rigidity of the fastening portion between the hub unit 20 and the wheel 10 is increased, and the driving performance of the vehicle 1 can be improved.

[0025] As described above, each wheel 10 mounted on the vehicle 1 of this embodiment has a high fastening rigidity with the hub unit 20, and is configured to improve the driving performance of the vehicle 1. (Second embodiment)

[0026] Next, a description will be given of the configuration of a second embodiment of each wheel 10 mounted on the vehicle 1. Note that the same components as those in the first embodiment will be denoted by the same reference numerals, and the description of those components will be omitted.

[0027] As shown in Figures 9 and 10, in this embodiment, each fastening protrusion 17 is formed in the inner diameter direction of the wheel 10 on the center bore 14 side, in this case an arc-shaped protrusion 31 is formed protruding toward the inner side at a position spaced a predetermined distance away, and a concave groove portion is formed adjacent to the outer side of this protrusion 31.

[0028] The protrusion 31 has a contact surface 31a at the protruding end on the inner side. Each fastening protrusion 17 has an inner surface 17a on the outer side of the groove 32, and the opening surface 15a of the bolt hole 15 is formed on the inner surface 17a.

[0029] Also, each fastening protrusion 17 is processed by cutting or the like so that protrusion 31 protrudes from inner surface 17a and opening surface 15a of bolt hole 15 to the inner side by a minute predetermined amount β of, for example, about 0.01 to 0.1 mm. That is, in each fastening protrusion 17, inner surface 17a and opening surface 15a of bolt hole 15 are in the same plane, and protrusion 31 of each fastening protrusion 17 forms an abutment portion whose thickness increases slightly by the predetermined amount β from inner surface 17a and bolt hole 15 toward the inner side.

[0030] Here, when wheel nut 18 is tightened with a predetermined fastening torque T determined for bolt screw 22 and wheel 10 is properly mounted to hub unit 20, inner surface 17a and opening surface 15a of bolt hole 15 are set to be at a reference position (reference surface). That is, inner surface 17a and opening surface 15a of bolt hole 15 are provided in the same plane. Note that inner surface 17a may be a tapered surface as in the first embodiment.

[0031] When each wheel 10 mounted on the vehicle 1 of this embodiment configured as described above is assembled to the hub unit 20, as shown in Figure 11, the abutment surface 31a of the protrusion 31 protruding from the bolt hole 15 of each fastening protrusion 17 to a position a predetermined distance away in the inner diameter direction of the wheel 10 on the center bore 14 side becomes the abutment portion that first abuts against the outer surface 20a of the hub unit 20.

[0032] When the wheel nuts 18 are tightened to the respective bolt screws 22 inserted into the respective bolt holes 15 of the wheel 10 with a predetermined fastening torque T, as shown in FIG. 12, a moment M toward the hub unit 20 is generated with the abutment surface 31a of the convex portion 31 of each fastening protrusion 17 as a fulcrum F, and the inner surface 17a abuts against the outer surface 20a in surface contact.

[0033] At this time, in each fastening protrusion 17, both the inner protrusion 31 on the inside of the wheel 10 and the outer inner surface 17a on the outside are in surface contact with the outer surface 20a at a reference position (reference surface).

[0034] As a result, in the wheel 10 of this embodiment, the inner surface 17a of each fastening protrusion 17 can be prevented from locally contacting the outer surface 20a.

[0035] In other words, even in this embodiment, the entire fastening surface between the inner surface 17a of the wheel 10 and the outer surface 20a of the hub unit 20 is in surface contact and can be fastened uniformly, without surface pressure concentrating around the bolt hole 15 of the fastening hole into which the bolt screw 22 is inserted.

[0036] Furthermore, when the wheel nut 18 is tightened with a specified fastening torque set for the bolt screw 22 and the wheel 10 is properly attached to the hub unit 20, a moment M is generated toward the hub unit 20 with the abutment surface 31a of the protrusion 31 formed on each fastening protrusion 17 as the fulcrum F.

[0037] Therefore, the wheel 10 can secure an arm length from the fulcrum F of the convex portion 31, which generates a moment M against a prying input caused by tightening the wheel nut 18 onto the bolt screw 22, to the tightening position, thereby increasing the rigidity of the fastening portion with the hub unit 20.

[0038] As with the first embodiment, the configuration of wheel 10 of the present embodiment described above also provides high fastening rigidity with hub unit 20, thereby improving the driving performance of vehicle 1. (Third embodiment)

[0039] Next, a description will be given of the configuration of the third embodiment of each wheel 10 mounted on the vehicle 1. Note that the same components as those in the first and second embodiments are given the same reference numerals, and the description of those components will be omitted.

[0040] As shown in Figures 13 and 14, in this embodiment, each fastening protrusion 17 has an inner surface 17a formed as an inclined surface having a predetermined angle θ toward the inside of the wheel 10 on the center bore 14 side, and an edge portion Q at a position spaced a predetermined distance from the bolt hole 15 in the inner diameter direction of the wheel 10 on the center bore 14 side is set to protrude toward the inner side with a minute predetermined amount γ, for example, of about 0.01 to 0.1 mm.

[0041] In addition, the fastening protrusions 17 have their inner surfaces 17a formed into inclined surfaces by processing the inner surface thereof by cutting or the like. That is, each inner surface 17a is a tapered surface that is slightly thicker so as to become higher from the outside to the inside of the center disc portion 13 of the wheel 10.

[0042] Further, the bolt holes 15 formed in each fastening protrusion 17 are provided on the outer side of the wheel 10, and the opening surface 15a is also located on the outer side of the wheel 10 on the inner surface 17a.

[0043] When each wheel 10 mounted on the vehicle 1 of this embodiment configured as described above is assembled to the hub unit 20, as shown in Figure 15, the edge Q of each fastening protrusion 17 protruding from the bolt hole 15 to a position spaced a predetermined distance in the inner diameter direction of the wheel 10 on the center bore 14 side becomes the abutment portion that first abuts against the outer surface 20a of the hub unit 20.

[0044] When the wheel nuts 18 are tightened to the respective bolt screws 22 inserted into the respective bolt holes 15 with a predetermined fastening torque T, a moment M is generated with the edge Q of each fastening protrusion 17 as a fulcrum, as shown in Figure 16, causing the inner surface 17a to abut against the outer surface 20a in surface contact.

[0045] At this time, the inner surface 17a of each fastening protrusion 17 is in surface contact with the outer surface 20a at a reference position (reference surface) of the opening surface 15a of the bolt hole 15.

[0046] As a result, in the wheel 10 of this embodiment as well, the inner surface 17a of each fastening protrusion 17 can be prevented from locally contacting the outer surface 20a.

[0047] Furthermore, as in the second embodiment, when the wheel 10 is properly attached to the hub unit 20 with the wheel nuts 18 tightened with a predetermined fastening torque T set for the bolt screws 22, a moment M is generated with the edge Q of each fastening protrusion 17 as a fulcrum.

[0048] Therefore, the wheel 10 can ensure an arm length from the fulcrum of the edge Q of each fastening protrusion 17, which generates a moment M against a prying input caused by fastening the wheel nut 18 to the bolt screw 22, to the fastening position, thereby increasing the rigidity of the fastening portion with the hub unit 20. Also, the inner surface 17a of each fastening protrusion 17 in this embodiment can have a larger contact area with the outer surface 20a than in the second embodiment.

[0049] As with the first and second embodiments, the configuration of wheel 10 of the present embodiment described above also provides high fastening rigidity with hub unit 20, thereby improving the driving performance of vehicle 1. (Fourth embodiment)

[0050] Next, a description will be given of the configuration of the fourth embodiment of each wheel 10 mounted on the vehicle 1. Note that the same components as those in the first to third embodiments are given the same reference numerals, and the description of those components will be omitted.

[0051] As shown in FIG. 17, the center disk portion 13 of the wheel 10 in this embodiment has an inner surface 40 that serves as the wheel side fastening surface, with multiple recesses 41, in this case five, formed circumferentially between the opening 15a of the bolt hole 15 and the inner surface 40.

[0052] As shown in Figure 18, the inner surface 40 is formed as an inclined surface having a predetermined angle θ extending outward from the center bore 14, and the edge R at a position a predetermined distance away in the outer radial direction of the wheel 10, which is outward from the bolt hole 15, is set to protrude toward the inner side by a predetermined amount ε, for example, about 0.06 mm.

[0053] That is, each inner surface 40 is a tapered surface that protrudes a predetermined amount ε and increases in thickness slightly outwardly away from the center bore 14 .

[0054] 19, a rough surface 40a is formed on the entire surface of each inner surface 40. The rough surface 40a is a fine uneven portion that is easily crushed and has a depth d of, for example, about 0.06 mm, which is set to the same amount as the protrusion of the edge portion R of the inner surface 40.

[0055] When each wheel 10 mounted on the vehicle 1 of this embodiment configured as described above is assembled to the hub unit 20, as shown in Figure 20, the edge R of the inner surface 40 protruding from the bolt hole 15 to a position a predetermined distance in the inner diameter direction of the wheel 10 on the center bore 14 side becomes the abutment portion that first abuts against the outer surface 20a of the hub unit 20.

[0056] Then, when the wheel nuts 18 are tightened to the respective bolt screws 22 inserted into the respective bolt holes 15 of the wheel 10 with a predetermined fastening torque T, the rough surface 40a formed on the inner surface 40 is crushed, and the inner surface 40 abuts against the outer surface 20a to come into surface contact, as shown in Figure 21.

[0057] At this time, the inner surface 40 comes into surface contact with the outer surface 20a at a reference position (reference surface). In addition, since the rough surface 40a is set to a depth d equal to the protrusion amount of the edge R of the inner surface 40, the inner surface 40 is easily crushed to the reference position where the inner surface 40 comes into surface contact with the outer surface 20a.

[0058] As a result, in the wheel 10 of this embodiment as well, the inner surface 17a of each fastening protrusion 17 can be prevented from locally contacting the outer surface 20a.

[0059] As shown in FIG. 22, the rough surface 40a formed on the inner surface 40 may be configured so that the unevenness changes from coarse to dense from the protruding edge R toward the center bore 14, making it easier to crush from the edge R side that first comes into contact with the outer surface 20a.

[0060] Furthermore, the rough surface 40a may be formed such that the combined depth of the reference position (reference surface) where the inner surface 40 and the outer surface 20a make surface contact becomes shallower from the protruding edge R toward the center bore .

[0061] In this way, by forming a rough surface 40a on the inner surface 40, the wheel 10 can be configured so that it is easier to crush from the side of the edge R that comes into contact first, and so that the entire surface of the inner surface 40 can easily come into surface contact with the outer surface 20a.

[0062] As with the first to third embodiments, the configuration of wheel 10 of the present embodiment described above also provides high fastening rigidity with hub unit 20, thereby improving the driving performance of vehicle 1.

[0063] The invention described in the above embodiments is not limited to those embodiments, and various modifications can be made in the implementation stage without departing from the gist of the invention. Furthermore, each of the above embodiments includes inventions at various stages, and various inventions can be extracted by appropriate combinations of the disclosed constituent elements.

[0064] For example, if some of the constituent elements shown in each form are deleted, and the stated problem can be solved and the stated effect can be obtained, the configuration from which these constituent elements are deleted can be extracted as an invention. [Explanation of symbols]

[0065] 1. Vehicle 2...wheels 3. Tires 10…Wheels 10...Vehicle wheels 11…Rim section 12...Disc section 13…Center disc section 14…Center bore 15...Bolt hole 15a...Opening surface 17… Fastening protrusion 17a…Inner side 18…Wheel nut 20...Hub unit 20a…Outer surface 20a…Hub side fastening surface 21…Center hub 22…Bolt screw 25...Brake rotor 31…Convex part 31a...Abutment surface 32…Groove 40…Inner surface 40a…Rough surface 41…Recess F…Fulcrum M...Moment O…hole axis P,Q,R…Edge T…Tightening torque α, β, γ, ε...predetermined amount θ…Angle

Claims

1. A vehicle wheel structure that is fastened to a hub unit of a vehicle and has an inner and outer wheel in a vehicle width direction defined therein, A center disk portion having a plurality of disk portions extending radially outwardly and having a center bore and a plurality of fastening holes; a contact portion provided on the inner side of the center disk portion, the contact portion being located at a predetermined distance from an opening of the fastening hole, the contact portion protruding a predetermined amount from a reference surface when the hub unit is fastened to the hub unit and contacting the hub side fastening surface first; a wheel-side fastening surface that is provided on the inner side of the center disk portion, has the opening formed therein, and that comes into surface contact with the hub-side fastening surface at the reference surface when a fastening member inserted into the fastening hole and a fastened member are fastened with a predetermined fastening torque; Equipped with The wheel side fastening surface is a tapered surface having a predetermined angle and a rough surface with a predetermined depth, 13. A vehicle wheel structure, comprising: a rough surface having a depth set to be equal to an amount of protrusion of the contact portion from the reference surface;

2. A vehicle wheel structure that is fastened to a hub unit of a vehicle and has an inner and outer wheel in a vehicle width direction defined therein, A center disk portion having a plurality of disk portions extending radially outwardly and having a center bore and a plurality of fastening holes; a contact portion provided on the inner side of the center disk portion, the contact portion being located at a predetermined distance from an opening of the fastening hole, the contact portion protruding a predetermined amount from a reference surface when the hub unit is fastened to the hub unit and contacting the hub side fastening surface first; a wheel-side fastening surface that is provided on the inner side of the center disk portion, has the opening formed therein, and that comes into surface contact with the hub-side fastening surface at the reference surface when a fastening member inserted into the fastening hole and a fastened member are fastened with a predetermined fastening torque; Equipped with The wheel side fastening surface is a tapered surface having a predetermined angle and a rough surface with a predetermined depth, 13. A vehicle wheel structure, comprising: a rough surface having a depth that becomes shallower from the contact portion toward the center disk portion so that the rough surface changes from rough to dense.

3. A wheel structure for a vehicle as described in claim 1 or claim 2, characterized in that the inner side of the center disc portion is provided with a fastening protrusion having the wheel side fastening surface and the abutment portion, the wheel side fastening surface being a tapered surface having a predetermined angle toward the opening, and the abutment portion being an edge portion of the wheel side fastening surface.

4. A wheel structure for a vehicle as described in claim 1 or claim 2, characterized in that the inner side of the center disc portion has a fastening convex portion having the wheel side fastening surface and the abutment portion, the abutment portion being a convex portion provided on the center bore side or the abutment portion being an edge portion of the wheel side fastening surface of the tapered surface having a predetermined angle.

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