WHEEL ASSEMBLY

Disclosed is a wheel assembly including a wheel portion, and optionally, a hub portion transmitting driving force transmitted through a drive shaft to the wheel portion. The wheel portion further includes a wheel flange portion connected to the hub portion, and the wheel flange portion includes a foreign matter discharge portion having a first discharge surface and a second discharge surface indented in different directions on an inner side surface.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application claims under 35 U.S.C. § 119 (a) the benefit Korean Patent Application No. 10-2023-0108842 filed on Aug. 21, 2023 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.

BACKGROUND

Technical Field

The present disclosure relates to a wheel assembly.

Background

The wheels of a vehicle are connected to a drive shaft and receive driving force through a hub. Additionally, the wheel and hub of the vehicle may be combined with a brake to generate braking force for the vehicle using the brake.

In this case, the wheel further includes a hubcap to prevent the drive shaft from being exposed externally. On the other hand, the joint between the hubcap and the wheel may not be completely sealed, and thus, foreign matter such as external moisture or the like may flow into the joint between the hubcap and the wheel.

Accordingly, a foreign matter discharge passage is formed in the inner side of the wheel to discharge incoming foreign matter according to the related art.

However, the foreign matter discharge passage according to the related art depends on the shape of the wheel and has thus a problem in that the rigidity of the wheel is reduced, thereby deteriorating the noise, vibration, harshness (NVH) performance of the vehicle.

SUMMARY

An embodiment of the present disclosure is to provide a wheel assembly in which vehicle's NVH performance may be improved by improving rigidity of a wheel, while also smoothly discharging foreign matter flowing into a hubcap.

An embodiment of the present disclosure is to provide a method of manufacturing a hub included in a wheel assembly that may smoothly discharge foreign matter flowing into a hubcap while improving NVH performance of the vehicle by improving rigidity of the wheel.

According to an embodiment of the present disclosure, a wheel assembly includes a wheel portion, and optionally, a hub portion transmitting driving force transmitted through a drive shaft to the wheel portion. The wheel portion further includes a wheel flange portion connected to the hub portion, and the wheel flange portion includes a foreign matter discharge portion having a first discharge surface and a second discharge surface indented in different directions on an inner side surface.

The wheel flange portion may further include a hubcap coupling portion connected to a hubcap, the first discharge surface may be provided along the inner side surface of the wheel flange portion, and the second discharge surface may be provided along an inner side surface of the hubcap coupling portion.

The second discharge surface may be provided with a predetermined slope with respect to the inner side surface of the hubcap coupling portion.

The predetermined slope may have an angle of about 8 degrees (°) to about 45 degrees (°) relative to the inner side surface of the hubcap coupling portion.

The wheel assembly may further include a brake disc portion disposed between the wheel portion and the hub portion, and a starting height of the second discharge surface may be set based on a surface facing the wheel portion of the brake disc portion.

The hub portion may include a disk guide portion having a cylindrical shape protruding to one side, and the disk guide portion may include a third discharge surface formed by indenting an outer circumferential surface of the one side.

The wheel assembly may further include a brake disc portion disposed between the wheel portion and the hub portion, and a starting height of the third discharge surface may be set based on a surface facing the wheel portion of the brake disc portion.

The third discharge surface may be provided in a position facing the foreign matter discharge portion.

The third discharge surface may have a width corresponding to a width of the foreign matter discharge portion.

The foreign matter discharge portion and the third discharge surface may form a foreign matter movement path through which foreign matter passes.

According to an embodiment of the present disclosure, a wheel assembly includes a wheel portion including a wheel flange portion having a foreign matter discharge portion provided by indenting an inner side surface, optionally, a brake disc portion connected to the wheel portion and transmitting braking force, and a hub portion connected to the wheel portion and including a disk support portion supporting the brake disk portion. The hub portion has a discharge surface formed by being indented in a position corresponding to the foreign matter discharge portion.

Positions of the foreign matter discharge portion and the discharge surface may be set based on a position of a coupling hole.

The coupling hole may be formed in the wheel portion, the brake disk portion, and the hub portion, respectively, and the wheel portion, the brake disk portion, and the hub portion may be connected using a coupling bolt penetrating through the coupling hole.

The foreign matter discharge portion may be formed in a number corresponding to that of the coupling hole.

The foreign matter discharge portion may include a first discharge surface formed in a circumferential direction of the wheel portion and a second discharge surface formed in an axial direction.

A starting height of the second discharge surface and a starting height of the discharge surface may be set based on a surface facing the wheel portion of the brake disc portion.

The discharge surface may be formed by forging using an annular mold.

The discharge surface may adjust a width by changing a size of a radius of the annular mold.

A width of the discharge surface may increase or decrease in proportion to an increase or decrease in a radius of the annular mold.

As discussed, the method and system suitably include use of a controller or processer.

In another embodiment, vehicles are provided that comprise an apparatus as disclosed herein.

DETAILED DESCRIPTION

Since the present disclosure may make various changes and have various embodiments, some embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present disclosure to the embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present disclosure.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present disclosure. The term ‘and/or’ includes a combination of a plurality of related recited items or any one of a plurality of related recited items.

Terms used in this application are only used to describe embodiments, and are not intended to limit the present disclosure. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms “include”, “have” and the like are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but it should be understood that it does not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless expressly defined in this application, it is not to be construed in an ideal or overly formal sense.

Hereinafter, with reference to the accompanying drawings, embodiments of the present disclosure will be described in more detail.

FIG.1is a perspective cross-sectional view of a wheel assembly according to an embodiment,FIG.2is a side cross-sectional view of a wheel assembly according to an embodiment, andFIG.3is an enlarged view of a wheel assembly illustrating a movement path (E) of foreign matter introduced through a hubcap140according to an embodiment.

Referring toFIGS.1and2, a wheel assembly according to an embodiment may include a wheel portion100, a brake disk portion200, and a hub portion300. In the wheel assembly, the brake disc portion200is disposed between the wheel portion100and the hub portion300, and the wheel portion100, the brake disc portion200, and the hub portion300are coupled by a coupling bolt (B) penetrating therethrough.

For example, the wheel portion100, the brake disc portion200, and the hub portion300may respectively include coupling holes formed in corresponding positions, and may be coupled to each other through the coupling bolt (B) passing through the coupling holes formed in corresponding positions.

The wheel portion100may include a rim portion110supporting a tire, and a wheel disc portion120having an outer circumferential surface coupled to the rim portion110and supported thereby, and coupled to the brake disc portion200and the hub portion300.

In this case, the wheel portion100may be integrally formed by welding the inner peripheral surface of the rim portion110and the outer peripheral surface of the wheel disk portion120.

The wheel disk portion120may have a hub hole150disposed in the center. The hub hole150may be formed by a cylindrical hubcap coupling portion130protruding from the center of the wheel disk portion120to one side.

In this case, a drive shaft400may protrude from the hub hole150formed by the hubcap coupling portion130. By combining the hubcap coupling portion130with the hubcap140, the drive shaft400protruding from the hub hole150may be prevented from being exposed externally.

The brake disc portion200may include a brake flange portion210and a sliding portion220.

The brake flange portion210is coupled to the drive shaft400by the coupling bolt (B) and is coupled to the hub portion300that rotates, and the sliding portion220has a disk-shaped disk structure and may generate braking force by frictionally contacting a brake pad (not illustrated).

In more detail, the sliding portion220of the brake disc portion200is disposed between a pair of brake pads (not illustrated) provided in the vehicle, and when the brake pad (not illustrated) moves toward the sliding portion220of the brake disc portion and contacts and presses the same, frictional force is generated between the brake pad (not illustrated) and the sliding portion220, thereby slowing down or stopping the rotational speed of the wheel portion100and the hub portion300combined with the flange portion of the brake disc portion200.

The hub portion300may include a hub flange portion310that is fixed and supported together with the brake disk portion200and the wheel portion100through the coupling bolt (B), a disk guide portion320having a hollow cylindrical shape and inserted into and supported by the brake flange portion210, and a body portion330having a hollow cylindrical shape and coupled to the drive shaft400therein.

On the other hand, referring toFIG.3, foreign matter such as moisture and the like may pass through the coupling portion of the hubcap coupling portion130and the hubcap140. Foreign matter flowing in through the hubcap coupling portion130may cause corrosion. Accordingly, foreign matter that has entered the coupling portion of the hubcap coupling portion130and the hubcap140is discharged to the outside of the wheel by centrifugal force generated by the rotation of the wheel.

In more detail, foreign matter introduced into the coupling portion of the hubcap coupling portion130and the hubcap140may pass through the space formed by the inner side surface of the cylindrical hubcap coupling portion130of the wheel portion100and the outer side surface of the guide portion of the hub portion300, and may be discharged externally through the space formed by the outer side surface F2of the brake flange portion210and a foreign matter discharge portion122of the wheel portion100.

FIG.4is a side cross-sectional view of the wheel portion100according to an embodiment,FIG.5is a perspective view of a wheel flange portion121viewed from the inner side according to an embodiment,FIG.6is a perspective cross-sectional view of the wheel flange portion121according to an embodiment, andFIG.7is an enlarged view of the foreign matter discharge portion122formed by a wheel, a brake disc, and a hub assembly according to an embodiment.FIG.8Ais a perspective view of a foreign matter discharge portion122according to the related art, andFIG.8Bis a perspective view of the foreign matter discharge portion122according to an embodiment of the present disclosure.

Referring toFIGS.4to6, the wheel flange portion121of the wheel according to an embodiment of the present disclosure may include a plurality of first coupling holes N1penetrating through the wheel flange portion121and a foreign matter discharge portion122formed on the inner side surface of the wheel flange portion121.

In this case, a plurality of foreign matter discharge portions122may be disposed between the plurality of first coupling holes N1, and the first coupling holes (N1) may have a cross-sectional shape that is indented from the outside to the inside, and the foreign matter discharge portion122may have a cross-sectional shape that is indented from the inside to the outside.

The first coupling hole (N1) may be formed by penetrating through the inner side and outer side surfaces of the wheel flange portion121, and the plurality of first coupling holes N1may be formed to be spaced apart from each other at equal intervals while forming a circle along the center of the wheel flange portion121.

The foreign matter discharge portion122may form a space for discharging foreign matter introduced into the space between the hubcap140and the hubcap coupling portion130to the outside of the wheel assembly.

The foreign matter discharge portion122may be formed on the inner side surface of the wheel flange portion121, and may be formed in the space between the first coupling holes (N1), which are spaced apart from each other at equal intervals and are disposed while forming a circle along the center of the flange portion.

The wheel flange portion121may be indented from the outer side to the inner side in the position where the first coupling hole N1is formed, and may be formed by indenting from the inner side to the outer side in the location where the foreign matter discharge portion122is formed.

The foreign matter discharge portion122may include a first outlet123, a foreign matter discharge groove125, and a second outlet124formed by being recessed from the inner side of the wheel flange portion121toward the outer side.

Additionally, the first outlet123, the foreign matter discharge groove125, and the second outlet124may be connected to each other. Foreign matter flowing into the space between the hubcap140and the hubcap coupling portion130may be discharged externally by centrifugal force generated by the rotational force of the wheel along the first outlet123, the foreign matter discharge groove125, and the second outlet124that are formed by indenting from the inner side to the outer side of the wheel flange portion121.

The first outlet123may be formed over a portion of the hubcap coupling portion130and a portion of the inner side surface of the wheel flange portion121.

In detail, the first outlet123may include a first discharge surface S1and a second discharge surface S2.

The first discharge surface S1may be formed to be substantially parallel to the inner side surface of the wheel flange portion121. Additionally, the second discharge surface S2may be formed on the inner side surface of the hubcap coupling portion130at a predetermined angle (θ).

InFIG.7, the dotted line exemplarily illustrates a cross section of the first outlet123according to the related art. Referring to the dotted line portion ofFIG.7andFIG.8A, the first outlet123according to the related art forms only a first discharge surface S1formed substantially parallel to the inner side surface of the wheel flange portion121. In addition, the first outlet123according to the related art is formed to have a relatively deep depth from the inner side surface of the wheel flange portion121to smoothly discharge foreign matter only through the first discharge surface S1.

On the other hand, the first discharge surface S1forming a deep depth from the inner side surface of the wheel flange portion121reduces the rigidity of the wheel flange portion121, which causes a problem in that the NVH performance of the vehicle deteriorates.

Referring toFIGS.5to7and8B, the first outlet123according to an embodiment of the present disclosure has a second discharge surface S2indented into the inner side surface of the hubcap coupling portion130and formed with a predetermined slope, and a first discharge surface S1formed by indenting the inner side surface of the wheel flange portion121.

Therefore, the first outlet123according to an embodiment may be formed to have a higher height than a height of the first outlet123according to the related art, and accordingly, the rigidity of the wheel flange portion121is improved, and the NVH performance of the vehicle may be improved.

In addition, the second discharge surface S2is formed with a predetermined slope by being indented in the inner side surface of the hubcap coupling portion130in the direction of the movement path (E) of foreign matter discharged externally by centrifugal force, thereby helping foreign matter inside the hub hole150to be smoothly discharged externally.

In addition, by adjusting the starting height (H1) of the second discharge surface S2, the wheel portion100according to an embodiment of the present disclosure may be compatible with the wheel portion100of the wheel, brake disc, and hub assembly according to the related art.

In this case, the starting height (H1) of the second discharge surface S2may be formed by using the outer surface (F2) of the brake flange portion (210) so as not to interfere with the disk guide portion320of the hub portion300.

For example, in the case of the first outlet123of a wheel according to the related art, the first outlet123may be formed at a distance of 12 mm from the outer side surface F2of the brake flange portion210.

In this case, if the starting height H1of the second discharge surface S2of the first outlet123according to an embodiment of the present disclosure is formed smaller than 12 mm based on the outer side surface (F2) of the brake flange portion210, interference with the brake disc portion200or other parts may occur.

Therefore, when the starting height H1of the second discharge surface S2of the first outlet123according to an embodiment is formed to be 12 mm or more based on the outer side surface (F2) of the brake flange portion210, which is same as the wheel portion100having the first outlet123according to the related art and may thus be compatible therewith, without interference with other parts including the brake disc portion200.

In the wheel, brake disc and hub assembly according to the related art, even if replaced with the wheel portion100according to an embodiment, foreign matter such as moisture and the like flowing into the hubcap140through the space between the upper surfaces of the disk guide portion320at the starting height H1of the second discharge surface S2may pass more smoothly and be discharged externally.

Referring again toFIG.7, the second discharge surface S2may form a predetermined angle θ based on the inner side surface of the cylindrical hubcap coupling portion130. The angle θ of the second discharge surface S2may be formed such that the depth of the groove increases as it moves away from the hubcap coupling portion130from the starting point of the second discharge surface S2.

The second discharge surface S2forming a predetermined angle θ is formed to be inclined in the direction of the centrifugal force of the foreign matter introduced through the hubcap140, and thus, foreign matter may be discharged externally more smoothly.

In this case, the predetermined angle (θ) may be about 8 degrees (°). The wheel portion100may be manufactured using a casting method, and in detail, the predetermined angle may be set to be greater than about 8 degrees (°) by considering the possibility of missing the casting mold and ease of molding, but the present disclosure is not limited thereto.

Additionally, if the predetermined angle θ is formed too large, there is a risk that the rigidity of the wheel assembly may decrease and the NVH improvement effect of the vehicle may be reduced. Therefore, the predetermined angle (θ) may be set, in detail, to be smaller than about 45 degrees (°), but the present disclosure is not limited thereto.

Referring again toFIG.8A, the first discharge portion according to the related art forms a one-dimensional passage. In more detail, the first discharge portion forms a first discharge surface S1in the direction from the hub hole150to the foreign matter discharge groove125.

Referring again toFIG.8B, the first discharge portion according to an embodiment of the present disclosure may form a two-dimensional passage. The first discharge portion may have a first discharge surface S1in the direction from the hub hole150to the foreign matter discharge groove125, and a second discharge surface S2formed in the direction of the inner side surface of the wheel flange portion121.

Accordingly, the height from the bottom of the foreign matter discharge groove125to the first discharge surface S1according to an embodiment of the present disclosure may be higher than the height from the bottom of the foreign matter discharge groove125to the first discharge surface S1according to the related art. In the wheel portion100according to an embodiment of the present disclosure, due to the material filled to the height from the bottom of the foreign matter discharge groove125to the first discharge surface S1, the rigidity of the wheel flange portion121may be strengthened to improve the NVH performance of the vehicle.

FIG.9is a perspective view of the hub portion300according to an embodiment,FIG.10is a side cross-sectional view of the hub portion300according to an embodiment, andFIG.11is a plan view of the hub portion300according to an embodiment.

Referring toFIGS.9to11, in the hub portion300according to an embodiment, a body portion330of a cylindrical shape that supports the drive shaft400transmitting engine driving force transmitted through the transmission to the wheels, a hub flange portion310extending in the radial direction of the cylindrical body portion330and forming a third coupling hole N3, and a disc guide portion320, which is provided on the axially outer end of the body portion330and into which the brake flange portion210of the brake disc portion200is inserted and supported, may be formed.

In this case, on the inner side surface of the cylindrical body portion330, a shaft coupling portion331repeatedly protruding in the inner diameter direction along the longitudinal direction of the body portion330such that it may rotate integrally with the drive shaft400, may further be included.

The drive shaft400has a cross-sectional shape corresponding to the cross-section of the cylindrical portion including the shaft coupling portion331, and is inserted into the cylindrical portion and fixedly supported, so as not to slip, and thus, the engine driving force transmitted through the transmission may be transmitted to the wheels.

The disk guide portion320may further include a plurality of third discharge surfaces S3formed along the outer circumferential surface at one end.

Referring again toFIG.7, as the disk guide portion320further includes the third discharge surface S3, the movement path (E) of the incoming foreign matter may secure sufficient space for the foreign matter to pass through, and foreign matter may be smoothly discharged externally.

In this case, the third discharge surface S3of the disk guide portion320may be formed to correspond to the position of the foreign matter discharge portion122of the wheel portion100, in more detail, the first outlet123.

As the first outlet123and the third discharge surface S3face each other, the space of the movement path E of foreign matter may be further expanded.

FIG.12Ais a plan view illustrating an annular mold (M) for forming the hub portion300and the third discharge surface S3according to an embodiment, by way of example, andFIG.12Bis a side view illustrating an annular mold (M) for forming the hub portion300and the third discharge surface S3according to an embodiment, by way of example.

A wheel assembly according to an embodiment may be assembled by the first coupling hole (N1) of the wheel portion100, the second coupling hole (N2) of the brake disc portion200, the third coupling hole (N3) of the hub portion300, and the coupling bolt (B) penetrating through the first to third coupling holes N1to N3.

Accordingly, as the foreign matter discharge portion122of the wheel portion100and the third discharge surface S3of the hub portion300are aligned based on the respective coupling holes formed in corresponding positions, the foreign matter discharge portion122and the third discharge surface S3may be formed in positions corresponding to each other, and a movement path (E) for foreign matter may be formed such that foreign matter may be discharged smoothly.

Referring toFIGS.5,9,11, and12A, the first coupling holes (N1), the second coupling holes (N2), and the third coupling holes (N3) may be formed in five, respectively, but the present disclosure is not limited thereto.

The wheel portion100may generally be manufactured through casting. In the case in which the wheel portion100is manufactured through casting, the foreign matter discharge portion122of the wheel portion100may be formed simultaneously with the first coupling hole N1.

Therefore, in the casting operation, the wheel portion100may be manufactured by manufacturing an upper or lower mold that reflects the position and shape of the foreign matter coupling portion based on the first coupling hole N1.

The hub portion300may be manufactured using a forging process.

For example, after first manufacturing the hub portion300in which no coupling hole is formed through a forging process by cutting and heating the raw material, the coupling hole may be processed by heat treatment, shorting, and the like.

In this case, referring toFIGS.12A and12B, the third discharge surface S3may be formed using an annular mold.

After disposing the annular mold (M) according to the position of the foreign matter discharge portion122, the third discharge surface S3may be formed by pressing the annular mold (M) using a forging press (P).

For example, by disposing five annular molds M to form the same angle from the center of the hub, the third discharge surface S3may be formed according to the position of the foreign matter discharge portion122of the wheel portion100.

In this case, when the positions of the foreign matter discharge portion122and the third discharge surface S3are determined based on the positions of the first to third coupling holes N1, N2, and N3, the foreign matter discharge portion122and the third discharge surface S3may be formed in positions corresponding to each other.

In the configuration in which the first to third coupling holes N1, N2and N3are formed, although the wheel portion100, the brake disk portion200, and the hub portion300are different from each other, since the coupling bolt penetrates through the first to third coupling holes N1, N2, and N3to connect the wheel portion100, the brake disk portion200and the hub portion300, the positions of the first to third coupling holes may correspond to each other in the wheel portion100, the brake disc portion200, and the hub portion300.

For example, when a foreign matter discharge portion122is formed at the exact center of the two first coupling holes and a third discharge surface S3is formed at the exact center of the two third coupling holes (N3) connected to the two first coupling holes (N1), the foreign matter discharge portion122and the third discharge surface S3may form positions corresponding to each other.

Since the wheel portion100is generally formed by casting, the coupling hole and the foreign matter discharge portion122may be formed simultaneously during the process of preparing the upper mold. On the other hand, the hub portion300may generally be formed by a forging process, and the third discharge surface S3may also be formed by forging.

Therefore, for continuity of the forging process, the hub portion300may be formed by first forging the third discharge surface and then setting the third coupling hole (N3) based on the position of the third discharge surface (S3) and drilling the same.

However, without being limited thereto, after forging the hub portion300, the third coupling hole (N3) is first formed by drilling, and the third discharge surface S3may be set based on the position of the third coupling hole (N3).

Additionally, by adjusting the size of the radius (R) of the annular mold (M), a width (d2) of the third discharge surface S3may be adjusted.

For example, when the size of the radius (R) of the annular mold (M) is increased or decreased, the width d2of the third discharge surface S3may increase or decrease. Accordingly, the width d2of the third discharge surface S3may be formed to correspond to the width d1of the first outlet123by adjusting the size of the radius R of the annular mold M.

By matching the width d2of the third discharge surface S3and the width d1of the first outlet123, rigidity may be significantly increasing by securing the movement path (E) of foreign matter and also significantly reducing material loss.

Referring again toFIG.7, the starting height (H2) of the third discharge surface S3formed by pressing the annular mold (M) may be set based on the outer surface (F2) of the brake flange portion210, like the second discharge surface S2of the wheel portion100.

For example, the starting height H2of the third discharge surface S3may be forged to be 5 mm based on the outer side surface F2of the brake flange portion210.

In this case, by setting the starting height H2of the third discharge surface S3and the starting height H1of the second discharge surface S2based on the outer side surface F2of the brake flange portion210, compatibility with wheel assemblies according to the related art may be improved.

For example, the height of the first outlet according to the related art may be confirmed based on the outer side surface (F2) of the brake flange portion210, and by forming the starting height (H1) of the second discharge surface S2according to an embodiment of the present disclosure depending on the height of the confirmed first outlet, assembly with brake discs and hubs according to the related art may be obtained.

In addition, by forming the starting height H2of the third discharge surface S3based on the outer side surface F2of the brake flange portion210, the movement path (E) of foreign matter may be sufficiently secured, and the foreign matter discharge performance may be maintained or further improved compared to the related art.

As set forth above, the wheel assembly according to an embodiment may have improved NVH performance of a vehicle by improving rigidity of the wheel.

Additionally, the wheel assembly according to an embodiment may smoothly discharge foreign matter flowing into the hubcap.

In addition, in a method of manufacturing a hub according to another embodiment, by forming a foreign matter discharge passage along with a wheel with improved rigidity, a hub helping to smoothly discharge foreign matter flowing into the hubcap while improving vehicle's NVH performance may be manufactured.

In addition, in a method of manufacturing a hub according to another embodiment, by forming a foreign matter discharge passage along with a wheel with improved rigidity, a hub helping to smoothly discharge foreign matter flowing into the hubcap while improving vehicle's NVH performance may be manufactured.