WHEEL ARRANGEMENT AND VEHICLE WITH IT

Abstract

A wheel assembly comprises a wheel and an insert inserted into the wheel. Specifically, the insert comprises: an outer region defining one side of the insert in a radially outward direction, the radially outward direction being defined as a direction in which a center of the wheel faces an outer circumferential surface of the wheel; and an inner region extending from the outer region in a radially inward direction opposite to the radially outward direction and configured to define one side of the insert in the radially inward direction. The wheel comprises: an insertion region configured to accommodate the outer region; and a cover region extending from the insertion region in a radially inward direction and configured to surround a portion of the inner region.

Description

TECHNICAL AREA

[0001] The present disclosure relates to a wheel arrangement and a vehicle with it. BACKGROUND

[0002] The statements in this section merely provide background information regarding the present disclosure and do not represent the state of the art.

[0003] Generally, vehicle wheels are primarily manufactured from a single metal material to ensure sufficient durability. However, wheels made of such metal are relatively heavy, and this weight negatively impacts the vehicle's acceleration and suspension characteristics.

[0004] In order to achieve a lower weight than a wheel made entirely of metal, while still ensuring sufficient durability, recent research has focused on a wheel arrangement that combines a lighter wheel with reinforcing inserts. SUMMARY

[0005] The present disclosure was made to solve the above-mentioned problems that arise in the prior art, while retaining the advantages gained through the prior art.

[0006] One aspect of the present disclosure provides for a wheel arrangement that can ensure sufficient durability at a relatively low weight.

[0007] The technical problems that are to be solved by the present disclosure are not limited to the problems mentioned above, and any other technical problems not mentioned here will be clearly understood by average persons skilled in the field to which the present disclosure relates from the following description.

[0008] According to one aspect of the present disclosure, a wheel arrangement comprises a wheel and an insert inserted into the wheel. In one embodiment, the insert comprises: an outer region defining a side of the insert in a radially outward direction, the radially outward direction being defined as a direction in which a center of the wheel faces an outer circumferential surface of the wheel; and an inner region extending from the outer region in a radially inward direction opposite to the radially outward direction, the inner region defining a side of the insert in the radially inward direction.In another embodiment, the wheel comprises: an insertion area configured such that the outer area is inserted therein; and a cover area extending radially inward from the insertion area and configured to surround a portion of the inner area. The inner area comprises a first area surrounded by the insertion area and the cover area.

[0009] In one embodiment, the insert can have a ring shape in which a cavity is formed, and the inner area can further have a second area, one end of which is exposed in a radially inward direction to the cavity of the insert.

[0010] In one embodiment, a plurality of first areas and a plurality of second areas can be provided in the wheel. In particular, the multiple first areas and the multiple second areas can be arranged alternately along a circumferential direction of the wheel.

[0011] In one embodiment, an inner groove with a shape that is recessed in a radially outward direction with respect to the second area can be formed in the first area, and the cover area can be inserted into the inner groove.

[0012] In one embodiment, the width of the first area in a circumferential direction of the wheel can be smaller than the width of the second area in the circumferential direction of the wheel.

[0013] In one embodiment, the insert can further comprise a stepped area that defines a step in a lateral direction of the wheel between the inner area and the outer area.

[0014] In one embodiment, the thickness of the inner region in the width direction of the wheel can be greater than the thickness of the outer region in the width direction of the wheel.

[0015] In one embodiment, one side of the inner region can have a shape that projects in the width direction in relation to the outer region.

[0016] In one embodiment, where an imaginary plane passing through a center of the insert and perpendicular to the radially inward direction is defined as a first plane, and where a cross-sectional surface obtained by cutting the insert through the first plane is considered, an angle defined by a first straight line, which is an imaginary straight line passing through one end of the stepped region in the width direction and an opposite end of the stepped region in the width direction, and a second straight line, which is an imaginary straight line passing through one end of the outer region in the width direction, may be equal to or less than 90 degrees.

[0017] In one embodiment, if an imaginary plane passing through an opposite end of the insert in the width direction and perpendicular to the width direction is defined as the reference plane, an opposite end of the inner region in the width direction and an opposite end of the outer region in the width direction may be located on the reference plane.

[0018] In one embodiment, an outer groove with a shape recessed in a radially inward direction and an outer hole with a shape extending in the width direction of the wheel can be formed in the outer region, wherein a plurality of outer grooves and a plurality of outer holes can be provided in the wheel. In particular, the plurality of outer grooves and the plurality of outer holes can be arranged alternately along a circumferential direction of the wheel.

[0019] In one embodiment, the outer area and the inner area can be formed in one piece.

[0020] In one embodiment, the wheel can have a plurality of column areas, each of which is inserted into a plurality of outer holes.

[0021] In one embodiment, the insertion area, the covering area and the majority of column areas can be formed in one piece.

[0022] In one embodiment, the insert can be arranged such that it is spaced from the center of the wheel to a side in the width direction of the wheel.

[0023] In one embodiment, the stiffness of a material of the insert can be higher than the stiffness of a material of the wheel.

[0024] In one embodiment, the insert material can be a metal, and the wheel material can be plastic.

[0025] According to one aspect of the present disclosure, a vehicle comprises a vehicle body and a wheel assembly mounted on the vehicle body. The wheel assembly comprises a wheel and an insert inserted into the wheel. In particular, the insert comprises: an outer region defining a side of the insert in a radially outward direction, the radially outward direction being defined as a direction in which a center of the wheel faces an outer circumferential surface of the wheel; and an inner region extending from the outer region in a radially inward direction opposite to the radially outward direction and configured to define a side of the insert in the radially inward direction.The wheel comprises an insertion area configured such that the outer area is inserted into it; and a cover area extending from the insertion area in a radially inward direction and configured to surround a portion of the inner area. The inner area comprises a first area surrounded by the insertion area and the cover area. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and other tasks, features and advantages of the present disclosure should become clearer from the following detailed description in conjunction with the accompanying drawings: Fig. Figure 1 is a perspective view of a wheel arrangement according to an embodiment of the present disclosure; Fig. 2 is a perspective cross-sectional view of a wheel arrangement according to an embodiment of the present disclosure; Fig. Figure 3 is a perspective cross-sectional view of an insert according to an embodiment of the present disclosure; Fig. 4 is a view illustrating one side of an insert according to an embodiment of the present disclosure; Fig. 5 is a view illustrating an opposite side of an insert according to an embodiment of the present disclosure; Fig. Figure 6 is a first perspective view of a wheel according to an embodiment of the present disclosure; Fig. Figure 7 is a cross-sectional view illustrating that a column area of ​​the wheel is inserted into an outer hole according to an embodiment of the present disclosure; Fig. Figure 8 is a second perspective view of a wheel according to an embodiment of the present disclosure; and Fig. Figure 9 is a perspective cross-sectional view of a wheel arrangement according to a further embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] In the following, embodiments of the present disclosure are described in detail with reference to the accompanying drawings. Reference numerals are added to the components in the drawings to indicate that the same components are designated with the same reference numerals even if they are drawn in different drawings. Furthermore, a detailed description of embodiments of the present disclosure has been omitted where it was determined that a detailed description of related known configurations and functions could impair the understanding of the embodiments of the present disclosure.

[0028] If a component, device, element or the like is described in the present disclosure as having a purpose or performing an operation, function or the like, the component, device or element herein should be considered to be "configured to fulfill such purpose or to perform such operation or function".

[0029] In the following, with reference to the drawings, a wheel arrangement 1 and a vehicle therewith are described in accordance with the present disclosure.

[0030] Vehicles can be understood as a concept encompassing a small mobility vehicle, a purpose-built vehicle (PBV), an electric vehicle, and a vehicle with an internal combustion engine. Such a vehicle may include a vehicle body, which defines the vehicle's external appearance, and a wheel arrangement.

[0031] Fig. Figure 1 is a perspective view of a wheel arrangement according to an embodiment of the present disclosure, Fig. Figure 2 is a perspective cross-sectional view of the wheel arrangement according to an embodiment of the present disclosure, Fig. Figure 3 is a perspective cross-sectional view of an insert according to an embodiment of the present disclosure, Fig. Figure 4 is a view illustrating one side of the deployment according to an embodiment of the present disclosure, and Fig. Figure 5 is a view illustrating an opposite side of the insertion according to an embodiment of the present disclosure.

[0032] With reference to Fig. In sections 1 to 5, a wheel arrangement 1 can define at least one section of a tire mounted on a vehicle. For example, the wheel arrangement 1 can be provided in a small mobility vehicle, a purpose-built vehicle (PBV), and the like. The wheel arrangement 1 can comprise a wheel 100 and an insert 200.

[0033] The wheel 100 can define an external appearance of the wheel assembly 1. As a detailed example, the wheel 100 can be manufactured by injection molding using an overmolding process through a mold (not shown) that has a shape corresponding to the shapes of the insert 200 and the wheel 100.

[0034] The wheel 100 can have the shape of a hollow ring. For example, the wheel 100 can have the shape of a hollow donut. Furthermore, the stiffness of the wheel 100 can be less than the stiffness of the insert 200. For example, the wheel 100 can be made of plastic. The wheel 100 can have an insert area 110, a cover area 120, a body area 130, and a column area 140.

[0035] Fig. Figure 6 is a first perspective view of the wheel according to an embodiment of the present disclosure, Fig. Figure 7 is a cross-sectional view illustrating that a column area of ​​the wheel is inserted into an outer hole according to an embodiment of the present disclosure, and Fig. Figure 8 is a second perspective view of the wheel according to an embodiment of the present disclosure.

[0036] With further reference to Fig. 6 to 8, an outer region 210 of the insert 200, described below, can be inserted into the insertion region 110. The insertion region 110 can define a portion of one side of the wheel 100 in a radially inward direction “RI”. An insertion groove, which is a groove with a shape recessed toward one side of the wheel 100 in the radially inward direction RI, can be formed in the insertion region 110c. The insertion groove can extend in a circumferential direction “C” of the wheel 100.

[0037] The cover area 120 can be configured to surround a section of an inner area 220 of the insert 200, as described below. The cover area 120 can be configured to pass through a cavity of the insert 200. For example, if an imaginary plane passing through the cover area 120 and perpendicular to the circumferential direction “C” is defined as a cover reference plane, the inner area 220 can be located within the cover area 120 and the insert area 110 when considering a cross-section obtained by cutting the wheel assembly 1 through the cover reference plane. The inner area 220 can be in close contact with the cover area 120 and the insert area 110.

[0038] The covering area 120 can extend from the insertion area 110 in the radially inward direction RI. Furthermore, a plurality of covering areas 120 can be provided. The plurality of covering areas 120 can be arranged such that they are spaced apart from one another along the circumferential direction “C”. In one embodiment, the covering area 120 and the insertion area 110 can be formed integrally.

[0039] The body area 130 can define an external appearance of the wheel 100. For example, an inner circumferential surface of the body area 130 can define an inner circumferential surface of the wheel 100, and an outer circumferential surface of the body area 130 can define an outer circumferential surface of the wheel 100. The inner circumferential surface of the body area 130 can define a specific empty space. A wheel hub motor and the like can be arranged in this empty space. Furthermore, the insertion area 110 and the cover area 120 can be arranged on one side of the body area 130 in a lateral direction ("W") of the wheel 100.

[0040] The column area 140 can extend in the lateral direction “W”. For example, the column area 140 can have a cylindrical shape. The column area 140 can be formed within the interior of the body area 130. With respect to the radial directions RI and RO, the column area 140 can be arranged between an outer circumferential surface of the body area 130 and the insertion area 110.

[0041] The column section 140 can be inserted into an outer hole 210b, as described below, to be in close contact with the insert 200. For example, the column section 140 can have a shape corresponding to the outer hole 210b. A plurality of column sections 140 can be provided. The plurality of column sections 140 can be arranged such that they are spaced apart from each other along the circumferential direction “C”.

[0042] The insert 200 can be inserted into one side of the wheel 100 in the radially inward direction RI. The insert 200 can have a ring shape in which a cavity is formed. For example, the insert 200 can have a donut shape in which a cavity is formed. In one embodiment, the insert 200 can be made of a metal material. The insert 200 can have an outer region 210 and an inner region 220.

[0043] With renewed reference to Fig. 3 to 5, the outer region 210 can define one side of the insert 200 in the radially outward direction RO. The outer region 210 can be inserted into the insertion groove. An outer groove 210a and an outer hole 210b can be formed in the outer region 210.

[0044] The outer groove 210a can be formed at one end of the outer region 210 in the radially outward direction RO. The outer groove 210a can be a groove with a shape that is recessed in a radially inward direction RI. A plurality of outer grooves 210a can be provided. The plurality of outer grooves 210a can be arranged such that they are spaced apart from each other along the circumferential direction “C”.

[0045] The outer hole 210b can be a hole configured to pass through the outer region 210 in the width direction “W”. The center of the outer hole 210b can be located on one side in the radially inward direction RI of the center of the outer groove 210a. In other words, the center of the outer hole 210b can be positioned radially inward from the center of the outer groove 210a in the radially inward direction RI. A plurality of outer holes 210b can be provided. The plurality of outer holes 210b can be arranged such that they are spaced apart from one another along the circumferential direction “C”. For example, the plurality of outer grooves 210a and the plurality of outer holes 210b can be arranged alternately along the circumferential direction “C”.

[0046] The inner region 220 can define one side of the insert 200 in the radially inward direction RI. The inner region 220 can extend from the outer region 210 in the radially inward direction RI. In one embodiment, the inner region 220 and the outer region 210 can be formed integrally. Furthermore, in one mold, the outer region 210, the inner region 220, and a stepped region 230 can be formed integrally.

[0047] Furthermore, the thickness of the inner region 220 in the width direction "W" can be greater than the thickness of the outer region 210 in the width direction "W". For example, one side of the inner region 220 in the width direction "W" can have a shape that projects in the width direction relative to the outer region 210. This one side in the width direction "W" can be defined as a side in a direction where the insert 200 faces the center of the wheel 100 with respect to the width direction "W". Furthermore, an opposite side in the width direction "W" can be defined as a side that is opposite to this one side in the width direction "W". For example, one side of the inner region 220 in the width direction "W" can have a shape that projects in the width direction "W" relative to a side of the outer region 210.

[0048] In one embodiment, an opposite side of the inner region 220 in the width direction “W” can have a shape that does not project from an opposite side of the outer region 210 in the width direction. For example, the opposite end face of the inner region 220 in the width direction “W” and the opposite end face of the outer region 210 in the width direction “W” can be located on a reference plane. The reference plane can be defined as an imaginary plane that passes through an opposite end of the insert 200 in the width direction “W” and is perpendicular to the width direction “W”. In other words, an opposite end face of the outer region 210 in the width direction “W” and an opposite end face of the inner region 220 in the width direction “W” can be aligned parallel to the radial directions RI and RO, respectively.The inner area 220 can have a first area 221 and a second area 222.

[0049] The first region 221 can be surrounded by the insertion region 110 and the cover region 120. For example, one end of the first region 221 in the radially inward direction RI may not be exposed to the cavity of the insert 200. As a more detailed example, the cover region 120 can be configured to cover the outer surface of the first region 221, so that the first region 221 and the cover region 120 are in close contact with each other.

[0050] The first region 221 may have an internal groove 221a. The internal groove 221a may be formed at one end of the first region 221 in the radially inward direction RI. The internal groove 221a may have a shape that is recessed in the radially outward direction RO with respect to the second region 222. For example, the cover region 120 may be inserted into the internal groove 221a to pass through the internal groove 221a in the width direction “W”. As a detailed example, if one side of the insert 200 is considered in the circumferential direction “C”, the cover region 120 inserted into the internal groove 221a may overlap two adjacent second regions 222.

[0051] In one embodiment, a plurality of first regions 221 can be provided. The plurality of first regions 221 can be arranged such that they are spaced apart from one another along the circumferential direction “C”. For example, the first region 221 and the second region 222 can be formed integrally.

[0052] One end of the second region 222 in the radially inward direction RI can be exposed to the cavity of the insert 200. In other words, the outer surface of the second region 222 cannot come into contact with the wheel 100. The second region 222 can be arranged between two adjacent first regions 221 from the plurality of first regions 221 in the circumferential direction “C”.

[0053] A counterpart can be arranged on a surface of the second region 222 in the lateral direction “W”. The counterpart can refer to any object (for example, a wheel hub motor) that can be coupled to or in close contact with the wheel arrangement 1. A surface of the second region 222 in the lateral direction “W” can have a flat, planar shape that is perpendicular to the lateral direction “W”.

[0054] The width of the second region 222 in the circumferential direction “C” can differ from the width of the first region 221 in the circumferential direction “C”. For example, the width of the first region 221 in the circumferential direction “C” can be smaller than the width of the second region 222 in the circumferential direction “C”. If the width of the second region 222 in the circumferential direction “C” is specified as large, then a region of a side face of the second region 222 in the width direction “W” can be enlarged. Accordingly, the counterpart located in the second region 222 can be stably positioned on a side face of the second region 222 in the width direction “W”.

[0055] The stepped area 230 can define a step in the width direction “W” between the outer area 210 and the inner area 220. The stepped area 230 can connect an end face of the outer area 210 in the width direction “W” and an end face of the inner area 220 in the width direction “W”.

[0056] With renewed reference to Fig. 3. A cross-sectional surface obtained by cutting the insert 200 through a first plane (an imaginary plane passing through the center of the insert 200 and perpendicular to the radially inward direction RI) can be called the first cross-sectional surface. When considering the first cross-sectional surface, an imaginary straight line passing through one end of the stepped region 230 in the latitude direction “W” and an opposite end of the stepped region 230 in the latitude direction “W” can be called the first straight line L1. When considering the first cross-sectional surface, an imaginary straight line passing through one end of the outer region 210 in the latitude direction “W” can be called the second straight line L2.

[0057] For example, a first angle "a", which is an angle defined by the first straight line L1 and the second straight line L2, may be 90 degrees or less. If, for example, the first angle "a" is greater than 90 degrees, one end of the stepped region 230 in the latitude direction "W" may be located radially outward from an opposite end of the stepped region 230 in the latitude direction "W". As another example, if the first angle "a" is 90 degrees, one end of the stepped region 230 in the latitude direction "W" and an opposite end of the stepped region 230 in the latitude direction "W" may be arranged so that they face each other parallel to the latitude direction "W".

[0058] With reference to Fig. 9 a rib 101 can be formed in the wheel 100 according to another embodiment of the present disclosure. Fig. Figure 9 is a perspective cross-sectional view of a wheel arrangement according to a further embodiment of the present disclosure.

[0059] As in Fig. As shown in Figure 9, a plurality of ribs 101 can be provided in the wheel 100. The plurality of ribs 101 can comprise a plurality of first ribs, a plurality of second ribs, and a plurality of third ribs.

[0060] The majority of first ribs can be arranged on an outer circumferential surface of body region 130c. The majority of first ribs can be arranged so that they are spaced apart from each other along the circumferential direction “C”. The majority of second ribs can be arranged on one side of body region 130 in the lateral direction “W”. The majority of second ribs can be arranged so that they are spaced apart from each other along the circumferential direction “C”. The majority of third ribs can be arranged on an opposite side of body region 130 in the lateral direction “W”. The majority of third ribs can be arranged so that they are spaced apart from each other along the circumferential direction “C”.

[0061] The wheel arrangement according to the present disclosure can improve the acceleration performance and suspension characteristics of the vehicle while having a relatively low weight.

[0062] Furthermore, the wheel arrangement according to the present disclosure can provide sufficient durability.

[0063] In the description above, the present disclosure is not necessarily limited to this embodiment simply because all components constituting the embodiment of the present disclosure are described as combined or operating in combination. In other words, within the scope of the purpose of the present disclosure, all components may operate in a selective combination of one or more. Furthermore, terms such as "include," "comprise," or "have," as described above, mean that the corresponding component may be present and thus do not exclude other components unless expressly stated otherwise, and should rather be interpreted as being able to include other components.Unless otherwise defined, all terms, including technical or scientific terms, have the same meaning as they are generally understood by a person of average expertise in the field to which this disclosure relates. Terms such as those defined in dictionaries and commonly used should be interpreted in accordance with their contextual meanings in the related technologies and should not be interpreted as ideal or overly formal meanings unless expressly stated otherwise in this disclosure.

[0064] The above description is a simple, exemplary description of the technical concepts of the present disclosure, and a person skilled in the art in the field to which the present disclosure relates can make various corrections and modifications without deviating from the essential features of the present disclosure. Therefore, the embodiments disclosed in the present disclosure do not serve to limit the technical concepts of the present disclosure, but rather to describe them, and the scope of the technical concepts of the present disclosure is not limited by the embodiments. The scope of protection of the present disclosure should be interpreted by the following claims, and all technical concepts in the equivalent field should be interpreted as being contained within the scope of the present disclosure. 1 Wheel arrangement 100 wheels 110 Application area 120 Coverage area 130 body area 140 column area 200 deployment 210 outer area 210a outer groove 210b outer hole 220 inner area 221 first area 221a inner groove 222 second area 230-tiered area

Claims

[1] Wheel arrangement comprising: a wheel; and an insert configured to be inserted into the wheel, the insert comprising: an outer area defining a side of the insert in a radially outward direction, wherein the radially outward direction is defined as a direction in which a center of the wheel faces an outer circumferential surface of the wheel; and an inner area extending from the outer area in a radially inward direction opposite to the radially outward direction and configured to define one side of the insert in the radially inward direction, the wheel includes: an insertion area configured so that the outer area is inserted into it; and a cover area extending from the insertion area in a radially inward direction and configured to surround a section of the inner area, and wherein the inner area comprises a first area which is surrounded by the insertion area and the covering area. [2] Wheel arrangement according to claim 1, wherein the insert has a ring shape in which a cavity is formed, and wherein the inner area further comprises: a second area, one end of which is exposed in the radially inward direction towards the cavity of the insert. [3] Wheel arrangement according to claim 2, wherein a plurality of first areas and a plurality of second areas are arranged alternately along a circumferential direction of the wheel. [4] Wheel arrangement according to claim 2, wherein an inner groove with a shape which is recessed in the radially outward direction with respect to the second area is formed in the first area, and wherein the cover area is inserted into the inner groove. [5] Wheel arrangement according to claim 2, wherein a width of the first area in a circumferential direction of the wheel is smaller than a width of the second area in the circumferential direction of the wheel. [6] Wheel arrangement according to claim 2, wherein the insert further comprises: a stepped area that defines a step in a lateral direction of the wheel between the inner area and the outer area. [7] Wheel arrangement according to claim 6, wherein the thickness of the inner region in the width direction of the wheel is greater than the thickness of the outer region in the width direction of the wheel. [8] Wheel arrangement according to claim 6, wherein one side of the inner area has a shape in the width direction which projects in the width direction in relation to the outer area. [9] Wheel arrangement according to claim 8, wherein, if an imaginary plane passing through a center of the insert and perpendicular to the radially inward direction is defined as the first plane, and when considering a cross-sectional area obtained by cutting the insert through the first plane, an angle defined by a first straight line, which is an imaginary straight line passing through one end of the stepped area in the latitude direction and an opposite end of the stepped area in the latitude direction, and a second straight line, which is an imaginary straight line passing through one end of the outer area in the latitude direction, is equal to or less than 90 degrees. [10] Wheel arrangement according to claim 8, wherein, if an imaginary plane passing through an opposite end of the insert in the width direction and perpendicular to the width direction is defined as a reference plane, an opposite end of the inner region in the width direction and an opposite end of the outer region in the width direction are located on the reference plane. [11] Wheel arrangement according to claim 1, wherein an outer groove with a shape which is recessed in a radially inward direction and an outer hole with a shape which extends in the width direction of the wheel are formed in the outer region, wherein a plurality of outer grooves and a plurality of outer holes are arranged alternately along a circumferential direction of the wheel. [12] Wheel arrangement according to claim 1, wherein the outer region and the inner region are formed in one piece. [13] Wheel arrangement according to claim 11, wherein the wheel comprises: a plurality of column sections, each inserted into a plurality of outer holes. [14] Wheel arrangement according to claim 13, wherein the insertion area, the cover area and the plurality of column areas are formed in one piece. [15] Wheel arrangement according to claim 1, wherein the insert is arranged such that it is spaced apart from a center of the wheel to a side in a width direction of the wheel. [16] Wheel arrangement according to claim 1, wherein the stiffness of a material of the insert is higher than the stiffness of a material of the wheel. [17] Wheel arrangement according to claim 16, wherein the material of the insert is a metal, and wherein the material of the wheel is plastic. [18] Vehicle, comprising: a vehicle body; and a wheel arrangement configured to be mounted on the vehicle body, the wheel arrangement includes: a wheel; and an insert configured to be inserted into the wheel, the deployment includes: an outer area defining a side of the insert in a radially outward direction, wherein the radially outward direction is defined as a direction in which a center of the wheel faces an outer circumferential surface of the wheel; and an inner area extending from the outer area in a radially inward direction opposite to the radially outward direction and configured to define one side of the insert in the radially inward direction, the wheel includes: an insertion area configured so that the outer area is inserted into it; and a cover area extending from the insertion area in a radially inward direction and configured to surround a section of the inner area, and wherein the inner area comprises a first area which is surrounded by the insertion area and the covering area.

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