JP5857784B2 - Vehicle wheel - Google Patents

Description

  The present invention relates to a vehicle wheel.

  Conventionally, a wheel for holding a tire is known (see, for example, Patent Document 1).

  The wheel described in Patent Document 1 includes a wheel body and a wheel cap mounted on the vehicle exterior side of the wheel body. The wheel body includes a rim portion that holds a tire, a hub portion that is supported by an axle, and a connecting portion that connects the rim portion and the hub portion, and a ventilation hole is formed in the connecting portion. The wheel cap is formed with a ventilation portion and an annular guide surface.

  When the vehicle travels, air flows outward through the air holes of the wheel body, and flows along the guide surface from the airflow of the wheel cap.

JP 2003-48403 A

  However, the wheel described in Patent Document 1 has a configuration in which the aerodynamic performance is improved by the wheel cap, so that there is a problem that the appearance of the wheel looks poor. Moreover, since the number of parts is increased by the wheel cap, there is a problem that the product cost increases.

  Accordingly, an object of the present invention is to provide a vehicle wheel having a high appearance in appearance while maintaining high aerodynamic performance and low cost.

The vehicle wheel according to the present invention includes a rim disposed on the vehicle inner side when mounted on the vehicle, and a disk configured separately from the rim and joined to the vehicle outer side of the rim. An annular peripheral portion is disposed on the outer side in the radial direction of the disk, and the surface of the outer peripheral peripheral portion on the vehicle outer side at the peripheral portion is formed flat. Further, by joining the end of the rim on the vehicle outer side to the vehicle inner side of the peripheral edge of the disk, the end of the rim and the peripheral edge of the disk form a first closed cross section.
Further, a first protrusion that extends toward the inside of the vehicle is formed at a radially outer end of the outer peripheral edge of the disk, and a flange portion at which the outer end of the rim is bent radially outward is formed. Form. The radially outer side and the vehicle outer side of the flange part are respectively butted against the radially inner side of the first projecting part and the vehicle inner side of the outer peripheral edge part of the first projecting part. The flange portion of the rim is joined to the first protrusion and the outer peripheral edge of the rim in a state where the end and the inner end of the flange portion are flush with each other.

According to the vehicle wheel according to the present invention, the surface of the outer periphery of the vehicle at the periphery is formed flat, so that the air resistance during vehicle travel is reduced and high aerodynamic performance can be obtained. In addition, since there is no wheel cap, appearance can be improved and cruising distance can be improved by reducing weight.
Furthermore, since the inner end of the first protrusion and the inner end of the flange portion are flush with each other, the first protrusion and the flange portion are efficiently joined by friction stir welding with high joint strength. can do.

1 is a front view showing a vehicle wheel according to a first embodiment of the present invention. It is sectional drawing by the AA line of FIG. It is sectional drawing to which the peripheral part of FIG. 2 was expanded. It is sectional drawing which shows the vehicle wheel by 2nd Embodiment of this invention. It is a graph which shows the relationship between the ratio of the radial direction length of a peripheral part with respect to a disk diameter, and the air resistance coefficient of a wheel. It is a graph which shows the relationship between the ratio of the radial direction length of a peripheral part with respect to a disc diameter, and the change of the weight of a vehicle wheel. It is a graph which shows the relationship between the ratio of the radial direction length of a peripheral part with respect to a disc diameter, and the cruising range of a vehicle.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, the vehicle outer side refers to the vehicle width direction outer side in a state where the vehicle wheel is mounted, and the vehicle inner side refers to the vehicle width direction inner side. Further, the radially outer side indicates a direction away from the radial center, and the radial inner side indicates a direction toward the radial center.

[First embodiment]
As shown in FIGS. 1 and 2, the vehicle wheel 1 according to the present embodiment includes a rim 3 disposed on the inner side of the vehicle in a mounted state on the vehicle, a separate body from the rim 3, and the vehicle of the rim 3. And a disk 5 joined to the outside.

  The rim 3 is disposed at a base portion 7 disposed at a central portion in the width direction, bead seats 9 and 11 disposed on both sides of the base portion 7 in the width direction, and an inner end portion of the bead seat 11. It is formed from the ear | edge part 13 standingly arranged toward the radial direction outer side. A bead portion of a tire (not shown) is fitted into the bead sheets 9 and 11, and the outer side in the width direction of the bead portion is supported by the ear portion 13.

  As shown in FIG. 1, the disk 5 includes a hub portion 15 disposed at a central portion in the radial direction, a spoke portion 17 extending linearly outward from the hub portion 15 in the radial direction, and a radial direction. And a peripheral edge portion 19 provided in an outer end portion and formed in an annular shape along the circumferential direction. The spoke part 17 connects the hub part 15 and the peripheral part 19, and five spoke parts 17 are provided at equal intervals along the circumferential direction. The hub portion 15 has a hub hole 21 that is inserted into and supported by an axle-side hub (not shown). Note that the diameter of the disk 5 from the radial outer end 23 on one side to the radial outer end 25 on the other side across the radial center C serving as the center of the hub hole 21 is a dimension D. A hub-side bolt 27 is fastened to the radially inner end of the spoke portion 17. As shown in FIG. 2, the radial length along the radial direction of the peripheral edge portion 19 of the disk 5 is L. Here, the relationship between the dimensions D and L is set to satisfy 0.1D ≦ 2L ≦ 0.2D.

  As shown in FIG. 3, the peripheral edge portion 19 of the disk 5 is arranged on the vehicle outer side and extends along the radial direction, and from the radially outer end of the vehicle outer peripheral edge portion 31 toward the vehicle inner side. The first projecting portion 33 that extends and the second projecting portion 35 that extends from the radially inner end of the vehicle outer peripheral edge portion 31 toward the vehicle inner side are integrally formed. Surfaces 31a and 35a of the vehicle outer peripheral edge 31 and the second protrusion 35 are formed flat. Here, “flat” includes shallow irregularities that form a pattern on the surface by etching, laser marking, or the like, or shallow irregularities for decoration purposes.

  On the other hand, the vehicle outer side end portion 37 of the base portion 7 of the rim 3 is formed flat, and a bent portion 41 is formed obliquely outward from the end edge 39 of the vehicle outer side end portion 37 in the radial direction. Further, a bead seat 9 is formed from the radially outer end of the bent portion 41 toward the vehicle outer side, and a flange portion 43 that is bent radially outward from the vehicle outer end edge of the bead seat 9 is formed. . The flange 43 is abutted against the radially inner side 33 a of the first protrusion 33 of the disk 5 and the inner side 31 b of the outer peripheral edge 31 of the disk 5. The bent portion 41, the bead seat 9, and the flange portion 43 constitute an end portion of the rim 3.

  Here, in a state where the vehicle inner end 33b of the first protrusion 33 and the vehicle inner end 43a of the flange portion 43 are arranged flush with each other, the radially outer side 43a of the flange portion 43 of the rim 3 is connected to the friction stir welding (FSW). ) To the radially inner side 33a of the first protrusion 33 of the disk 5. In addition, the vehicle outer side 43b of the flange portion 43 of the rim 3 may be bonded to the vehicle inner side 31b of the vehicle outer peripheral edge portion 31 of the disk 5 by friction stir welding. In this friction stir welding, the tool 45 is pressed against the inner end 33b of the first protrusion 33 and the inner end 43a of the flange 43 while rotating the cylindrical tool 45, thereby generating heat by friction. Joining is performed. Note that this joining is not limited to friction stir welding, but may be joining by arc welding such as MIG welding.

  Further, the inner end of the second protrusion 35 of the disk 5 is formed in a beveled chamfer 47, and the edge of the outer end of the base portion 7 of the rim 3 is also obliquely cut out. A notch 49 is formed. Then, the chamfered portion 47 of the second protrusion 35 of the disk 5 abuts the notch 49 in the base portion 7 of the rim 3. In this abutting portion, the radial inner side surface 35a of the second protrusion 35 and the radial inner side surface 37a of the vehicle outer end portion of the base portion 7 of the rim 3 are arranged flush with each other. The chamfered portion 47 of the second protrusion 35 is joined to the notch 49 in the base portion 7 of the rim 3 by friction stir welding. Note that this joining is not limited to friction stir welding, but may be joining by arc welding such as MIG welding.

  Further, the second projecting portion 35 extends substantially orthogonal to the vehicle outer peripheral edge portion 31, and the first closed cross-section portion S <b> 1 is formed by the peripheral edge portion 19 and the end portion of the rim 3. . In other words, in the present embodiment, the peripheral edge portion 19 is disposed at the radially outer end of the disk 5, and the first closed cross-section portion S <b> 1 is disposed inside the peripheral edge portion 19. Specifically, the first closed cross section S1 is defined by the bent portion 41 of the rim 3, the bead seat 9 and the flange portion 43, the vehicle outer peripheral edge portion 31 and the second protrusion 35 of the disk 5. It is a part. In the present embodiment, since the second protrusion 35 extends substantially orthogonal to the vehicle outer peripheral edge 31, the volume of the first closed cross section S1 can be set large.

  The material of the disk 5 is preferably magnesium or aluminum casting, forging, or die casting. Further, as the material of the rim 3, a cast material or wrought material of magnesium or aluminum is preferable. When the disk 5 is a forged material and the rim 3 is a wrought material, the effect of reducing the weight is increased. Further, when the disk 5 is a die-cast material, the productivity is increased and the manufacturing cost is reduced.

  Below, the effect by this embodiment is demonstrated.

  (1) A vehicle wheel 1 according to the present embodiment includes a rim 3 disposed on the inner side of the vehicle in a mounted state on the vehicle, and a disc that is configured separately from the rim 3 and joined to the outer side of the rim 3. And 5.

  A surface 31a of the vehicle outer peripheral edge portion 31 is formed flat on the outer peripheral edge portion 19 which is disposed on the outer side in the radial direction of the disk 5 and formed in an annular shape, while the vehicle outer end portion of the rim 3 is formed on the outer edge of the disk. While joining to the back surface 31b of the peripheral part 19, the edge part of these rim | limbs 3 and the peripheral part 19 of the disk 5 form 1st closed cross-section part S1.

  Thus, since the surface 31a of the vehicle outer peripheral edge portion 31 is formed flat, the air resistance during vehicle travel is reduced, and the cruising distance is improved. Moreover, since the cover is not used, the appearance of the appearance is improved. And since 1st closed cross-section part S1 was formed, the weight of the wheel 1 for vehicles becomes small, and a cruising distance further improves. In addition, since the rigidity of the peripheral part 19 improves by 1st closed cross-section part S1, silence can be obtained.

  (2) The peripheral edge portion 19 is disposed at the radially outer end of the disk 5, and the first closed cross section S <b> 1 is disposed inside the peripheral edge portion 19.

  Therefore, since the first closed cross-section portion S1 is disposed at the most radially outer portion of the vehicle wheel 1, the volume of the first closed cross-section portion S1 is increased. Therefore, the effects of reducing the weight of the vehicle wheel 1 and improving the rigidity of the peripheral edge portion 19 are further increased.

  (3) A first protrusion 33 extending toward the vehicle inner side is formed at a radially outer end of the outer peripheral edge portion 31 of the disk 5, and the vehicle of the rim 3 is formed on the first protrusion 33. A flange portion 43 whose outer end portion is bent radially outward is abutted, and the inner end 33b of the first protrusion 33 and the inner end 43a of the flange portion 43 are flush with each other at the abutting portion. In this state, the flange portion 43 of the rim 3 is joined to the first projection portion 33.

  Thus, since the vehicle interior end 33b of the first projection 33 and the vehicle interior end 43a of the flange 43 are arranged flush with each other, the first projection 33 and The flange portion 43 can be efficiently joined.

  (4) A second protrusion 35 extending toward the vehicle inner side is formed at the radially inner end of the outer peripheral edge of the disk 5, and the vehicle inner end of the second protrusion 35 is connected to the rim 3. While abutting against the base portion 7, in the abutting portion, the radially inner side surface 35 a of the second protrusion 35 and the radially inner side surface 37 a of the base portion 7 of the rim 3 are arranged flush with each other, The second protrusion 35 of the disk 5 is joined to the base portion 7 of the rim 3.

  As described above, the radially inner side surface 35a of the second protrusion 35 and the radially inner side surface 37a of the base portion 7 of the rim 3 are arranged flush with each other. 2 and the base portion 7 of the rim 3 can be efficiently joined.

  (5) The radial length along the radial direction of the peripheral edge portion 19 of the disk 5 is L, and one radial outer end 23 and the other radial outer end 25 sandwich the radial center C of the disk 5. Is set such that 0.1D ≦ 2L ≦ 0.2D, where D is the diameter of the disk connecting the two. That is, the length twice the radial length L is not less than 10% and not more than 20% of the disk diameter D.

  If it is less than 10%, the volume of the first closed cross section S1 is reduced and the weight of the vehicle wheel 1 is increased, so that the cruising distance is reduced. On the other hand, when it is larger than 20%, the improvement rate of the Cd value is low and does not contribute much to the improvement of the cruising distance.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. However, parts having the same structure as in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The vehicle wheel 51 according to the present embodiment is different from the first embodiment in that a second closed cross section is formed in the spoke portion of the disk 55.

  As shown in FIG. 4, a first closed cross-section S1 is formed on the inner side of the peripheral edge of the disc, and a second closed cross-section S2 that extends over substantially the entire length in the radial direction is formed on the spoke 57. Is formed. The second closed cross section S2 communicates with the first closed cross section S1. In FIG. 4, for the sake of convenience, a broken line is shown between the first closed cross section S1 and the second closed cross section S2.

  Below, the effect by this embodiment is demonstrated.

  (1) The disk 55 includes the peripheral edge portion 19, a hub portion 15 disposed in the central portion in the radial direction, and a spoke portion that extends along the radial direction and connects the peripheral edge portion 19 and the hub portion 15. 57, and a second closed cross section S2 is formed in the spoke portion 57.

  In this manner, by forming the second closed cross-section portion S2 in the spoke portion 57, the effects of reducing the weight of the vehicle wheel 51 and improving the rigidity of the peripheral edge portion 19 are further increased.

[Example]
Next, the present invention will be described more specifically through examples.

  In the graph of FIG. 5, the horizontal axis indicates the ratio of the radial length of the peripheral edge to the disk diameter, and the vertical axis indicates the rate of change of the air resistance coefficient Cd value of the wheel. Specifically, the horizontal axis indicates 2 L / D × 100 (%). In this graph, the experimental result by the wheel which concerns on 1st Embodiment is shown. As shown in FIG. 5, the rate of change of the air resistance coefficient Cd value gradually increases from around 10% on the horizontal axis, and the rate of increase decreases around 20%.

  In the graph of FIG. 6, the solid line indicates the case of the wheel having the first closed cross section according to the first embodiment (example of the present invention), and the broken line is the case of the solid wheel having no closed cross section. (Comparative example) is shown. As shown in FIG. 6, in the case of the example of the present invention, the rate of change of the weight of the wheel increases almost proportionally as the value on the horizontal axis increases. However, in the case of the comparative example, the rate of change in weight increases rapidly from around 10%.

  Further, in the graph of FIG. 7, in the case of the example of the present invention indicated by the solid line, the change rate of the cruising distance gradually decreases from when the horizontal axis is 0%, and the change of the cruising distance is almost 0 when the horizontal axis is 10%. As a result, the cruising range is almost completely improved at 20%. Here, when it is 10%, the cruising distance decrease due to the weight increase of the wheel and the cruising distance improvement due to the improvement of the Cd value are substantially the same. When it is 20%, the effect of improving the cruising distance by increasing the weight of the wheel is almost lost. Accordingly, 2L / D × 100 (%) is preferably 10 to 20 (%).

  However, to be exact, the change in the cruising distance becomes 0 at 11%, and then gradually increases, and the rate of change becomes constant around 20%. Therefore, 2L / D × 100 (%) is more preferably 11 to 20 (%).

  In the case of the comparative example indicated by the broken line, the rate of change in cruising distance is 0 at 13%. Therefore, 13 to 20% is a range in which the cruising distance can be surely improved regardless of the size of the closed cross section.

C ... Diameter center D ... Disk diameter S1 ... First closed section S2 ... Second closed section 1,51 ... Vehicle wheel 3 ... Rim 5,55 ... Disk 7 ... Base part 15 ... Hub part 17,57 ... Spoke part 19 ... Peripheral part 23, 25 ... Radial outer end 31 ... Outer peripheral part 31a ... Surface 33 ... First projection 35 ... Second projection 35a ... Radial inner side 37a ... Radial inner side 43 ... Flange part

Claims (5)

A vehicle wheel comprising: a rim disposed on the vehicle inner side in a state of being mounted on a vehicle; and a disk configured separately from the rim and joined to the vehicle outer side of the rim,
While forming the surface of the outer peripheral edge of the vehicle outside at the peripheral edge that is arranged radially outside the disk and formed in an annular shape,
Joining the vehicle outer end of the rim to the back surface of the peripheral edge of the disk, and forming a first closed cross section by the edge of the rim and the peripheral edge of the disk ,
Forming a first protrusion extending toward the vehicle inner side at a radially outer end of the outer peripheral edge of the disc;
The outer rim of the rim forms a flange that bends radially outward,
While abutting the radially outer side and the vehicle outer side of the flange portion respectively with the radial inner side of the first protrusion and the vehicle inner side of the outer peripheral edge of the vehicle,
In each of the butted portions, the flange portion of the rim is connected to the first protrusion portion and the vehicle outer peripheral edge portion in a state where the vehicle inner end of the first projection portion and the vehicle inner end of the flange portion are arranged flush with each other. A vehicle wheel characterized by being joined to the vehicle.   2. The vehicle wheel according to claim 1, wherein the peripheral edge portion is disposed at an end portion on a radially outer side of the disk, and the first closed cross-sectional portion is disposed on the vehicle inner side of the peripheral edge portion. Forming a second protrusion extending toward the vehicle inner side at the radially inner end of the outer peripheral edge of the disc, and abutting the vehicle inner end of the second protrusion with the base of the rim;
In this abutting portion, the second protrusion of the disk is used as the base of the rim, with the radially inner surface of the second protrusion and the radially inner surface of the base of the rim being arranged flush with each other. vehicle wheel according to claim 1 or 2, characterized in that the joined. When the radial length along the radial direction of the peripheral edge of the disk is L, and the disk diameter connecting one radial outer end and the other radial outer end across the radial center of the disk is D In addition,
The vehicle wheel according to any one of claims 1 to 3, characterized in that set to be 0.1D ≦ 2L ≦ 0.2D. The disk includes the peripheral portion, a hub portion disposed in a central portion in the radial direction, and a spoke portion that extends along the radial direction and connects the peripheral portion and the hub portion. The vehicle wheel according to any one of claims 1 to 4, wherein a second closed cross-sectional portion is formed on the vehicle wheel.

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