Wheel assembly and vehicle comprising same

Abstract

A wheel assembly may include a wheel rotating about a reference axis of rotation extending in an axial direction of the wheel assembly; a motor operated to provide rotational power to the wheels; a wheel assembly includes a motor, a disc connected to the motor and rotating together with at least a portion of the motor about a reference rotational axis, and a brake module disposed between the wheel and the motor in a radial direction of the wheel assembly, the radial direction being perpendicular to the axial direction, and the brake module pressing the disc in the axial direction when the wheel is rotated relative to the motor, operation of the disc is stopped by the brake module, and the brake module is spaced apart from the disc in an axial direction when rotational power is provided to the wheel by operation of the motor.

Description

Technical Field

[0001] The present disclosure relates to a wheel assembly and a vehicle including the wheel assembly. Background Art

[0002] A vehicle is provided with a brake, which is a device for reducing the speed of the vehicle. The brake is a device that presses on the wheels of the vehicle to reduce the rotational speed of the wheels. A conventional brake operates by pressing on the wheels of the vehicle through an external power source (such as a motor). In other words, a conventional brake is operated by a separate power source. In a vehicle equipped with a conventional brake operated by a separate power source, a brake and a power source must be provided in the vehicle to enable braking of the vehicle.

[0003] Meanwhile, when a conventional brake is applied to a small motor vehicle smaller than a conventional vehicle, there is not enough space in the small motor vehicle to install both the brake and the power source. Therefore, there has recently been an increasing demand for a wheel assembly provided with a brake that minimizes the space required for installation in a small motor vehicle. Summary of the Invention

[0004] Embodiments of the present disclosure may solve the above problems that occur in the prior art while maintaining the advantages achieved by the prior art unaffected.

[0005] Embodiments of the present disclosure provide a wheel assembly provided with such a brake, which can be applied to even small vehicles because the space required for installation is minimized.

[0006] The technical problems to be solved by the embodiments of the present disclosure are not necessarily limited to the above problems, and those skilled in the art to which the present disclosure pertains can understand from the following description that other technical problems not mentioned herein can also be solved by the embodiments of the present disclosure.

[0007] According to an embodiment of the present disclosure, a wheel assembly may include: a wheel that rotates about a reference rotation axis extending in the axial direction of the wheel assembly; a motor that operates to provide rotational power to the wheel; a disk that is connected to the motor and rotates about the reference rotation axis together with at least a part of the motor, and a brake module that is disposed between the wheel and the motor in the radial direction of the wheel assembly, the radial direction being perpendicular to the axial direction, and the brake module presses the disk in the axial direction when the wheel rotates relative to the motor, the operation of the disk stops, and when rotational power is provided to the wheel through the operation of the motor, the brake module is spaced apart from the disk in the axial direction.

[0008] In addition, the braking module may include: a first block fixed to the motor; a second block fixed to the wheel, and when the wheel rotates relative to the motor, the second block moves relative to the first block in the circumferential direction of the wheel assembly; and a brake pad disposed to face the disc in the axial direction, and at least a portion of the brake pad presses the disc when the second block moves.

[0009] In addition, a guiding projection extending in the radial direction of the wheel assembly may be formed in either the first block or the second block, and a guiding groove may be formed in the other of the first block and the second block. The guiding projection is inserted into the guiding groove in the radial direction. The guiding groove and the guiding projection may extend along the circumferential direction. The width of the guiding groove in the circumferential direction may be greater than the width of the guiding projection in the circumferential direction, and the guiding projection may move along the guiding groove in the circumferential direction.

[0010] In addition, when the direction of the radial direction (in which the motor faces the wheel) is the first radial direction, the guiding projection may be formed in the first block to have a shape protruding in the first radial direction, the guiding groove may be formed in the second block to have a shape recessed in the first radial direction, and the guiding projection may be inserted into the guiding groove in the first radial direction.

[0011] In addition, the widths of the guiding groove and the guiding projection in the axial direction may be smaller than their widths in the circumferential direction.

[0012] In addition, the brake pad may include: a pad fixed end axially fixed to one side of the second block; and a pad free end extending from one side in the circumferential direction of the pad fixed end to the other side in the circumferential direction, and the pad free end moves relative to the pad fixed end in the axial direction.

[0013] In addition, the disc may include: a first disc disposed on one side of the motor in the axial direction; and a second disc disposed on the other side of the motor in the axial direction. The brake pad may include: a first brake pad pressing the first disc on the one side in the axial direction; and a second brake pad pressing the second disc on the other side in the axial direction, and the first brake pad and the second brake pad may be disposed to be spaced apart from each other in the axial direction, wherein the second block is interposed between the first brake pad and the second brake pad.

[0014] In addition, the second block may include: a central region defining a central portion of the second block and connected to the brake pad; and an extending region extending from the central region to one side in the circumferential direction and spaced apart from the brake pad in the axial direction, and the extending region may include an inclined surface that extends inclinedly such that the spacing distance from the brake pad in the axial direction becomes greater as the inclined surface moves away from the central region.

[0015] In addition, the braking module may further include a pressing bearing which presses the brake pad due to the relative rotation of the wheel with respect to the motor, and the pressing bearing may be received in a receiving space formed between the brake pad and the inclined surface.

[0016] In addition, when the wheel assembly is viewed parallel to the axial direction from one side of the wheel assembly in the axial direction, at least a part of the pressing bearing, at least a part of the inclined surface, and at least a part of the brake pad may overlap each other.

[0017] In addition, when the width of the pressing bearing in the axial direction is the bearing width, the inclined surface may include: a first inclined section, the distance between the first inclined section and the brake pad in the axial direction may be equal to or less than the width of the pressing bearing in the axial direction; and a second inclined section, the distance between the second inclined section and the brake pad in the axial direction may be greater than the width of the pressing bearing in the axial direction, the receiving space may include: a first receiving space formed between the brake pad and the first inclined section; and a second receiving space formed between the brake pad and the second inclined section, and when the pressing bearing is located in the first receiving space, the pressing bearing may press the brake pad while contacting the brake pad, and when the pressing bearing is located in the second receiving space, the pressing bearing may be spaced apart from the brake pad.

[0018] In addition, the first block may include a placement area which is located between the pressing bearing and the brake pad when the pressing bearing is in the second receiving space and defines a space for placing the pressing bearing, and the placement area may include: a first surface arranged to face the brake pad; and a second surface located on the opposite side of the first surface in the axial direction and extending obliquely such that the distance from the brake pad in the axial direction becomes smaller as the second surface becomes farther from the central area.

[0019] In addition, the braking module may further include a pressing spring provided at one end on the circumferential side of the extending area, and the pressing spring presses the pressing bearing in a direction facing the placement area when the pressing bearing is in the second receiving space.

[0020] In addition, the pressing spring may include: a recessed area into which the extending area is inserted, and the recessed area has a shape in which the central area is recessed in the direction facing the extending area; and a contact area extending obliquely such that it becomes closer to the central area as the contact area advances in the axial direction from the recessed area, and one end of the contact area in the axial direction contacts the pressing bearing.

[0021] In addition, the placement area may further include a third surface extending from the second surface in the axial direction and arranged to face the pressing spring in the circumferential direction.

[0022] In addition, the first piece is fixed to the outer peripheral surface of the motor, and the second piece is fixed to the inner peripheral surface of the wheel.

[0023] Furthermore, each of the first piece and the second piece may have a shape that is symmetric with respect to the axial direction.

[0024] Moreover, each of the first piece and the second piece may have a shape that is symmetric with respect to the circumferential direction.

[0025] In addition, the braking module may further include a plurality of pressing bearings that press the brake pads due to the relative rotation of the wheel with respect to the motor, and the plurality of pressing bearings may be arranged to be spaced apart from each other between the first piece and the second piece and may be arranged symmetrically with respect to the axial direction and the circumferential direction.

[0026] Furthermore, the wheel assembly may further include a guiding unit that is disposed between the outer peripheral surface of the motor and the inner peripheral surface of the wheel and guides the relative rotation of the wheel with respect to the motor.

[0027] Moreover, the guiding unit may include: a first guiding region connected to the outer peripheral surface of the motor; a second guiding region connected to the inner peripheral surface of the wheel and spaced apart from the first guiding region in the radial direction of the wheel assembly; and guiding rollers disposed between the first guiding region and the second guiding region in the radial direction and guiding the movement of the second guiding region with respect to the first guiding region in the circumferential direction of the wheel assembly.

[0028] In addition, the guiding rollers may include a first roller and a second roller spaced apart from each other along the axial direction. The first guiding region includes: a first placement surface on which the first roller is placed; a second placement surface on which the second roller is placed; in the axial direction, a roller placement space may be formed between the first placement surface and the second placement surface, a part of the guiding rollers is located in the roller placement space, and when the direction in which the motor faces the wheel in the radial direction of the wheel assembly is the first radial direction, the roller placement space may have such a shape that the width of the roller placement space in the axial direction becomes larger as the roller placement space advances in the first radial direction.

[0029] In addition, when the direction in which the second mounting surface faces the first mounting surface in the axial direction is the first axial direction, and the direction opposite to the first axial direction is the second axial direction, the first mounting surface may extend obliquely to have a shape in which the distance from the motor in the radial direction increases as the first mounting surface advances in the first axial direction, the second mounting surface may extend obliquely to have a shape in which the distance from the motor in the radial direction becomes larger as the second mounting surface advances in the second axial direction, the first roller may rotate about a first roller rotation axis that extends in the direction in which the first mounting surface extends, and the second roller may extend in the direction in which the second mounting surface extends and rotate about a second roller rotation axis that intersects the first roller rotation axis.

[0030] In addition, a plurality of guide units and a plurality of braking modules may be provided, and the plurality of guide units and the plurality of braking modules may be alternately arranged along the circumferential direction of the wheel assembly.

[0031] In addition, the wheel assembly may further include a shaft that passes through the centers of the motor and the disk and defines a reference rotation axis.

[0032] According to an embodiment of the present disclosure, a vehicle may include: a body; a wheel assembly that moves the body; a wheel that rotates about a reference rotation axis extending in the axial direction of the wheel assembly; a motor that is operated to provide rotational power to the wheel; a disk that is connected to the motor and rotates together with at least a part of the motor about the reference rotation axis; and a braking module that is disposed between the wheel and the motor in the radial direction of the wheel assembly, the radial direction being perpendicular to the axial direction, and when the wheel rotates relative to the motor, the braking module presses the disk in the axial direction, the operation of the disk stops, and when rotational power is provided to the wheel by the operation of the motor, the braking module is spaced apart from the disk in the axial direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and other features and advantages of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0034] Figure 1 is a perspective view of a wheel assembly according to an embodiment of the present disclosure;

[0035] Figure 2 is an exploded perspective view of a wheel assembly according to an embodiment of the present disclosure;

[0036] Figure 3 is a view showing a state in which a disk is separated from a motor, a braking module, and a guide unit according to an embodiment of the present disclosure;

[0037] Figure 4is an enlarged view of a brake module according to an embodiment of the present disclosure;

[0038] Figure 5 shows Figure 4 a state in which a second block moves relative to a first block in a first circumferential direction;

[0039] Figure 6 is Figure 5 an enlarged view of region “A1” in;

[0040] Figure 7 is Figure 5 an enlarged view of region “A2” in; and

[0041] Figure 8 is a side view of a vehicle according to an embodiment of the present disclosure. Detailed Embodiments

[0042] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. When adding reference numerals to the components of the drawings, it should be noted that even when the same components are drawn in different drawings, they may be denoted by the same reference numerals. In addition, when describing the exemplary embodiments of the present disclosure, when it is determined that a detailed description of related known configurations and functions may impede the understanding of the embodiments of the present disclosure, its detailed description may be omitted.

[0043] Hereinafter, a wheel assembly 10 according to an exemplary embodiment of the present disclosure and a vehicle including the wheel assembly will be described with reference to the accompanying drawings.

[0044] Figure 1 is a perspective view of a wheel assembly according to an embodiment of the present disclosure. Figure 2 is an exploded perspective view of a wheel assembly according to an embodiment of the present disclosure.

[0045] The vehicle may be a small motor vehicle smaller than a conventional vehicle. The vehicle may include a body and a wheel assembly 10. A plurality of wheel assemblies 10 may be provided. The plurality of wheel assemblies 10 may include a pair of front wheel assemblies mounted on the front side of the body and a pair of rear wheel assemblies mounted on the rear side of the body.

[0046] When the vehicle is on an inclined ground (ramp), the wheel assembly 10 may perform a parking brake function to prevent the vehicle from rolling along the ramp. The wheel assembly 10 may include a motor 100, a wheel 200, a brake module 300, a guide unit 400, and a disk 500, any combination or all of which may be multiple or may include multiple components thereof.

[0047] The motor 100 can provide rotational power to the wheel 200. The motor 100 can include a rotor 110, a stator (not shown), a housing 120, and a shaft 130. The rotor 110 can rotate about a reference rotation axis "X". The reference rotation axis "X" can be defined as an imaginary straight line extending along the axial direction "A" of the wheel assembly 10 (hereinafter, the axial direction "A"). In addition, the radial direction "R" of the wheel assembly 10 (hereinafter, the radial direction "R") can be a direction perpendicular to the axial direction "A" and becoming farther away from or closer to the reference rotation axis "X". In addition, the circumferential direction "C" of the wheel assembly 10 (hereinafter, the circumferential direction "C") can be the direction in which the wheel assembly 10 rotates about the reference rotation axis "X".

[0048] The rotor 110 can rotate about the reference rotation axis "X" relative to the stator. The stator may not rotate, and the position of the stator relative to the vehicle body may be fixed. The stator can be disposed in a hollow portion formed in the rotor 110.

[0049] The housing 120 can be disposed to surround the outer peripheral surface of the rotor 110. For example, the housing 120 can have an annular shape with a hollow portion inside the housing. In addition, the rotor 110 can be disposed in the hollow portion of the housing 120. The housing 120 can rotate together with the rotor 110 when fixed to the rotor 110.

[0050] The shaft 130 can define the reference rotation axis "X". The shaft 130 can extend along the axial direction "A". In addition, the shaft 130 can be disposed to pass through the center of the motor 100. In addition, the shaft 130 can be disposed to pass through the center of the motor 100 and the center of the disk 500. The shaft 130 can rotate together with the rotor 110 and the disk 500. In other words, the shaft 130 can be fixed to the rotor 110 and the disk 500. In addition, one end of the shaft 130 can be coupled to the vehicle body.

[0051] The wheel 200 can rotate about the reference rotation axis "X". The wheel 200 can receive rotational power from the motor 100. When the wheel 200 does not receive rotational power from the motor 100, the wheel can rotate relative to the motor 100. The wheel 200 can include a rim 210 and a tire 220.

[0052] The rim 210 can be disposed to surround the outer peripheral surface of the motor 100. For example, a hollow portion can be formed inside the rim 210. The motor 100 can be disposed in the hollow portion of the rim 210.

[0053] The tire 220 can support the vehicle body when on the ground. The tire 220 can be disposed to surround the outer peripheral surface of the rim 210. The tire 220 can be fixed to the rim 210.

[0054] Figure 3 A view showing a state in which a disk is separated from a motor, a brake module, and a guide unit according to an embodiment of the present disclosure.

[0055] Further referring to Figure 3 , the brake module 300 can press the disk 500 in the axial direction "A" or can be spaced apart from the disk 500 in the axial direction "A". For example, when the brake module 300 presses the disk 500 in the axial direction "A", the rotation of the disk 500 is restricted. When the rotation of the disk 500 is restricted, the rotation of the shaft 130 fixed to the disk 500 can be restricted. When the rotation of the shaft 130 is restricted, the rotation of the rotor 110 fixed to the shaft 130 can be restricted. When the rotation of the rotor 110 is restricted, the rotation of the rim 210 can be restricted. For example, the rotor 110 and the rim 210 can be connected to each other by the brake module 300. As a detailed example, the brake module 300 can connect the rotor 110 and the rim 210 to allow either the rotor 110 or the rim 210 to rotate by a specific rotation angle within a certain range in the circumferential direction "C" relative to the other.

[0056] When the wheel 200 rotates relative to the motor 100 in a state where the motor 100 has stopped operating, the brake module 300 can press the disk 500 in the axial direction. For example, when the wheel 200 rotates relative to the motor 100 while the motor 100 has stopped operating, the brake module 300 can contact the disk 500, and the rotation of the disk 500 can be restricted by the friction caused by the contact with the brake module 300.

[0057] In addition, when rotational power is provided to the wheel 200 through the operation of the motor 100, the brake module 300 can be spaced apart from the disk 500 in the axial direction "A". In other words, the brake module 300 may or may not press the disk 500, which can depend on whether the motor 100 is operating.

[0058] The brake module 300 can be disposed between the wheel 200 and the motor 100 in the radial direction "R". For example, the brake module 300 can be disposed between the inner circumferential surface of the wheel 200 and the outer circumferential surface of the motor 100. A plurality of brake modules 300 can be provided. The plurality of brake modules 300 can be provided to be spaced apart from each other along the circumferential direction "C". The brake module 300 can include a first block 310, a second block 320, a brake pad 330, a pressing bearing 340, and a pressing spring 350, and any combination or all of them can be multiple or can include multiple components thereof.

[0059] Figure 4 An enlarged view of a brake module according to an embodiment of the present disclosure. Figure 5 Shows Figure 4A diagram showing the state where the second block is moved relative to the first block in the first circumferential direction.

[0060] See further Figures 2 to 5 , the first block 310 can be fixed to the motor 100. For example, the first block 310 can be fixed to the outer circumferential surface of the housing 120 of the motor 100. The first block 310 can rotate together with the rotor 110 about the reference rotation axis "X".

[0061] The first block 310 can have a shape symmetric with respect to the axial direction "A" for wheel balancing. For example, when the plane passing through the center of the first block 310 and perpendicular to the axial direction "A" is the first plane, the first block 310 can have a shape symmetric with respect to the first plane.

[0062] In addition, the first block 310 can have a shape symmetric with respect to the circumferential direction "C". For example, when the plane passing through the center of the first block 310 and perpendicular to the circumferential direction "C" is the second plane, the first block 310 can have a shape symmetric with respect to the second plane. The first block 310 can have a shape that is rotationally symmetric twice (180 degrees) about the rotation axis passing through the center of the first block 310 and extending in the radial direction "R".

[0063] Therefore, since the first block 310 can have a shape symmetric in the axial direction "A" and the circumferential direction "C", the existing first block can be easily replaced with a new first block. In addition, due to the symmetric shape of the first block 310, it can be easily assembled during the process of replacing the existing first block with a new one. The first block 310 can include a base region 311 and a placement region 312. In addition, a guide projection 310a can be formed in the first block 310.

[0064] The base region 311 can be connected to the outer circumferential surface of the housing 120. The placement region 312 can extend from the base region 311 in a direction that becomes further away from the reference rotation axis "X" in the radial direction "R". The pressing bearing 340 can be placed in the placement region 312. For example, when the brake module 300 and the disc 500 are separated from each other, the pressing bearing 340 can be placed and supported on the placement region 312. The placement region 312 can include a first surface 312a, a second surface 312b, and a third surface 312c.

[0065] The first surface 312a may be the surface of the placement area 312 facing the brake pad 330 in the axial direction “A”. The second surface 312b may be provided on the side opposite to the first surface 312a in the axial direction “A”. The second surface 312b may extend obliquely from one end of the first surface 312a. For example, the second surface 312b may extend obliquely such that the spacing distance between the brake pad 330 and the second surface 312b becomes smaller in the axial direction “A” as the second surface 312b becomes farther from the central area 321, which will be described later.

[0066] The third surface 312c may extend from one end of the second surface 312b in the axial direction “A”. For example, the third surface 312c may extend from one end of the second surface 312b toward the center of the base area 311 in the axial direction “A”. The first surface 312a, the second surface 312b, and the third surface 312c may be integrally formed.

[0067] A plurality of placement areas 312 may be provided. The plurality of placement areas 312 may include a first placement area 312-1 and a second placement area 312-2. The first placement area 312-1 may be provided on one side of the center of the base area 311 in the first circumferential direction C1. The opposite direction in the first circumferential direction C1 may be defined as the second circumferential direction C2, and the first circumferential direction C1 and the second circumferential direction C2 may be included in the circumferential direction “C”. When observing one side of the wheel assembly 10 parallel to the axial direction “A” in the axial direction “A”, either the first circumferential direction C1 or the second circumferential direction C2 may be the clockwise direction, and the other may be the counterclockwise direction.

[0068] A plurality of first placement areas 312-1 may be provided. For example, the plurality of first placement areas 312-1 may be provided as a pair of first placement areas 312-1 symmetric to each other with respect to the first plane. The pair of first placement areas 312-1 may be spaced apart from each other in the axial direction “A”.

[0069] The second placement area 312-2 may be provided on one side of the center of the base area 311 in the second circumferential direction C2. A plurality of second placement areas 312-2 may be provided. For example, the plurality of second placement areas 312-2 may be provided as a pair of second placement areas 312-2 symmetric to each other with respect to the first plane. The pair of second placement areas 312-2 may be spaced apart from each other in the axial direction “A”.

[0070] A plurality of first placement regions 312-1 and a plurality of second placement regions 312-2 may be arranged to be spaced apart from each other in the circumferential direction “C”, wherein the center of the base region 311 is between the plurality of first placement regions and the plurality of second placement regions. For example, the plurality of first placement regions 312-1 and the plurality of second placement regions 312-2 may be arranged to be symmetric with respect to a second plane.

[0071] The guiding projection 310a may have a shape that projects from a central portion of the base region 311 in a first radial direction. The first radial direction may be parallel to the radial direction “R” and may be the direction in which the base region 311 faces the inner peripheral surface of the wheel 200.

[0072] The width of the guiding projection 310a in the axial direction “A” may be different from the width of the guiding projection 310a in the circumferential direction “C”. For example, the width of the guiding projection 310a in the axial direction “A” may be smaller than the width of the guiding projection 310a in the circumferential direction “C”.

[0073] The second block 320 may be fixed to the wheel 200. For example, the second block 320 may be fixed to the inner peripheral surface of the rim of the wheel 200. The second block 320 may rotate together with the wheel 200 about the reference rotation axis “X”.

[0074] When the wheel 200 rotates relative to the motor 100, the second block 320 may move relative to the first block 310 in the circumferential direction “C”. The second block 320 may have a shape that is symmetric with respect to the axial direction “A”. For example, when a plane passing through the center of the second block 320 and perpendicular to the axial direction “A” is a third plane, the second block 320 may have a shape that is symmetric with respect to the third plane.

[0075] In addition, the second block 320 may have a shape that is symmetric with respect to the circumferential direction “C”. For example, when a plane passing through the center of the second block 320 and perpendicular to the circumferential direction “C” is a fourth plane, the second block 320 may have a shape that is symmetric with respect to the fourth plane. The second block 320 may have a shape that is rotationally symmetric twice (180 degrees) with respect to a rotation axis passing through the center of the second block 320 and extending in the radial direction “R”.

[0076] Therefore, since the second block 320 has a shape that is symmetric in the axial direction “A” and the circumferential direction “C”, it is possible to easily replace the existing second block with a new second block. In addition, due to the symmetric shape of the second block 320, it is possible to easily assemble the second block during the process of replacing the existing second block with a new one. The second block 320 may include a central region 321 and an extension region 322.

[0077] The central region 321 may define the central portion of the second piece 320. The central region 321 may be connected to the brake pad 330. The central region 321 may have a shape that protrudes in the axial direction "A" relative to the extension region 322. For example, the width of the central region 321 in the axial direction "A" may be greater than the width of the extension region 322 in the axial direction "A". A guide groove 321a may be formed in the central region 321.

[0078] The guide projection 310a may be inserted into the guide groove 321a in the second radial direction. The second radial direction may be a direction parallel to the radial direction "R", and in this direction, the wheel 200 faces the motor 100. The guide groove 321a may have a shape that is recessed in the central region 321 in the second radial direction. The width of the guide groove 321a in the axial direction "A" may be different from the width of the guide groove 321a in the circumferential direction "C". For example, the width of the guide groove 321a in the axial direction "A" may be less than the width of the guide projection 310a in the circumferential direction "C".

[0079] The width of the guide groove 321a in the circumferential direction "C" may be greater than the width of the guide projection 310a in the circumferential direction "C". In this way, since the width of the guide groove 321a in the circumferential direction "C" is formed to be greater than the width of the guide projection 310a in the circumferential direction "C", the guide projection 310a may move along the circumferential direction "C" when inserted into the guide groove 321a.

[0080] The extension region 322 may extend from the central region 321 to one side in the circumferential direction "C". The extension region 322 may include a section whose width in the axial direction "A" becomes smaller as the section moves away from the central region 321 (e.g., wedge-shaped). The extension region 322 may be spaced apart from the brake pad 330 in the axial direction "A". The extension region 322 may include an inclined surface 322a.

[0081] The inclined surface 322a may extend obliquely such that the spacing distance between the brake pad 330 and the inclined surface 322a in the axial direction "A" increases as the distance from the central region 321 increases. The inclined surface 322a may define opposite two side surfaces of the extension region 322 in the axial direction "A". A plurality of inclined surfaces 322a may be provided on opposite sides of the extension region 322 in the axial direction "A".

[0082] The spacing distance in the axial direction “A” between the plurality of inclined surfaces 322a can become smaller as the inclined surfaces become farther from the central region 321. In addition, each of the plurality of inclined surfaces 322a can be arranged to be symmetric with respect to the third plane. The inclined surface 322a can include a first inclined section 322a-1 and a second inclined section 322a-2.

[0083] The first inclined section 322a-1 can be defined as such a section of the inclined surface 322a in which the spacing distance from the brake pad 330 in the axial direction “A” is equal to or less than the width of the pressing bearing 340 in the axial direction “A”. For example, when the pressing bearing 340 is located between the first inclined section 322a-1 and the brake pad 330, the pressing bearing 340 can contact the brake pad 330. The space formed between the first inclined section 322a-1 and the brake pad 330 can be referred to as the first accommodation space. The first accommodation space can be included in the accommodation space 320a to be described later. The accommodation space 320a can be a space formed between the second block 320 and the brake pad 330. The pressing bearing 340 can be accommodated in the accommodation space 320a.

[0084] A plurality of accommodation spaces 320a can be provided. The plurality of accommodation spaces 320a can be divided by the second block 320. For example, four accommodation spaces 320a can be provided. Among the four accommodation spaces 320a, two accommodation spaces 320a that are relatively located on one side in the first circumferential direction C1 can be divided by the first extension region 322-1 and can be surrounded by the first extension region 322-1 and the brake pad 330.

[0085] In addition, among the four accommodation spaces 320a, two accommodation spaces 320a that are relatively located on one side in the second circumferential direction C2 can be divided by the second extension region 322-2 and can be surrounded by the second extension region 322-2 and the brake pad 330.

[0086] The second inclined section 322a-2 can be defined as such a section of the inclined surface 322a in which the spacing distance from the brake pad 330 in the axial direction “A” is greater than the width of the pressing bearing 340 in the axial direction “A”. For example, when the pressing bearing 340 is located between the second inclined section 322a-2 and the brake pad 330, the pressing bearing 340 can be spaced apart from the brake pad 330. The space formed between the second inclined section 322a-2 and the brake pad 330 can be referred to as the second accommodation space. The second accommodation space can be included in the accommodation space 320a. In addition, the first inclined section 322a-1 and the second inclined section 322a-2 can be integrally formed.

[0087] In addition, a plurality of extension regions 322 may be provided. The plurality of extension regions 322 may include a first extension region 322-1 and a second extension region 322-2. The first extension region 322-1 may extend from the central region 321 in a first circumferential direction C1. The first extension region 322-1 may include a section whose width in the axial direction "A" decreases as the section extends in the first circumferential direction C1.

[0088] The second extension region 322-2 may extend from the central region 321 in a second circumferential direction C2. The second extension region 322-2 may include a section whose width in the axial direction "A" decreases as the section extends in the second circumferential direction C2.

[0089] The first extension region 322-1 and the second extension region 322-2 may be spaced apart from each other in the circumferential direction "C", with the central region 321 being between the first extension region and the second extension region. The first extension region 322-1 and the second extension region 322-2 may be arranged to be symmetric with respect to a fourth plane. As an example, the first extension region 322-1, the second extension region 322-2, and the central region 321 may be integrally formed.

[0090] Figure 6 is Figure 5 an enlarged view of the region "A1". Figure 7 is Figure 5 an enlarged view of the region "A2".

[0091] Further referring to Figure 6 and Figure 7 and Figures 2 to 5 , the brake pad 330 may press the disc 500 by moving the second block 320 relative to the first block 310. A plurality of brake pads 330 may be provided to be connected to opposite ends of the second block 320 in the axial direction "A". The plurality of brake pads 330 may be arranged to be spaced apart from each other in the axial direction "A", with the second block 320 being between these brake pads. The brake pad 330 may include a pad fixed end 331 and a pad free end 332.

[0092] The pad fixed end 331 may be fixed to one end of the central region 321 of the second block 320 in the axial direction "A". The pad free end 332 may be configured to be movable relative to the pad fixed end 331 along the axial direction "A". The pad free end 332 may extend from one side of the pad fixed end 331 in the circumferential direction "C" to the other side in the circumferential direction "C".

[0093] The gasket fixed end 331 can be a fixed end relative to the gasket free end 332, and the gasket free end 332 can be a free end relative to the gasket fixed end 331. As an example, the brake gasket 330 can be a leaf spring, and an elastic force can be applied to the leaf spring in the axial direction “A”.

[0094] A plurality of brake gaskets 330 can be provided. The plurality of brake gaskets 330 can include a first brake gasket 330-1 and a second brake gasket 330-2. The first gasket fixed end (the gasket fixed end 331 of the first brake gasket 330-1) can be connected to one side of the central region 321 in the first circumferential direction C1. The first gasket free end (the gasket free end 332 of the first brake gasket 330-1) can extend from one side end of the first gasket fixed end in the first circumferential direction C1.

[0095] The second gasket fixed end (the gasket fixed end 331 of the second brake gasket 330-2) can be connected to one side of the central region 321 in the second circumferential direction C2. The second gasket free end (the gasket free end 332 of the second brake gasket 330-2) can extend from one side of the second gasket fixed end in the second circumferential direction C2. The second brake gasket 330-2 and the first brake gasket 330-1 can be arranged symmetrically with respect to the fourth plane.

[0096] The pressing bearing 340 can press the brake gasket 330 in the axial direction “A” by rotating the wheel 200 relative to the motor 100. For example, the pressing bearing 340 can press the brake gasket 330 in the axial direction “A” by moving the second block 320 relative to the first block 310. The pressing bearing 340 can be received in the receiving space 320a.

[0097] By moving the second block 320 relative to the first block 310, the pressing bearing 340 can move between the first receiving space and the second receiving space. For example, referring to Figure 6 , a path (along which the pressing bearing 340 located in the first receiving space can move to the second receiving space) can be formed in the circumferential direction “C” and the axial direction “A” in the direction facing the brake gasket 330. Further, referring to Figure 7 , a path (along which the pressing bearing 340 located in the second receiving space can move to the first receiving space) can be formed in the circumferential direction “C” and the axial direction “A” along the direction becoming farther from the brake gasket 330.

[0098] As an example, the pressing bearing 340 may have a cylindrical shape extending in the radial direction "R". Further, when observing the wheel assembly 10 parallel to the axial direction "A" on one side of the wheel assembly 10 in the axial direction "A", at least a part of the pressing bearing 340, at least a part of the inclined surface 322a, and at least a part of the brake pad 330 may overlap each other.

[0099] A plurality of such pressing bearings 340 may be provided. The plurality of pressing bearings 340 may include a first pressing bearing 341 and a second pressing bearing 342. A plurality of first pressing bearings 341 may be provided. For example, two first pressing bearings 341 may be provided to be spaced apart from each other in the axial direction "A", and may be respectively received in two receiving spaces 320a spaced apart from each other in the axial direction "A". The first pressing bearing 341 may be provided on a side closer to the first circumferential direction C1 than the second pressing bearing 342.

[0100] A plurality of second pressing bearings 342 may be provided. For example, two second pressing bearings 342 may be provided to be spaced apart from each other in the axial direction "A", and may be respectively received in two receiving spaces 320a spaced apart from each other in the axial direction "A". Further, the first pressing bearing 341 and the second pressing bearing 342 may be provided to be spaced apart from each other in the circumferential direction "C".

[0101] Referring again Figure 4 and Figure 5 , the pressing spring 350 may press the pressing bearing 340 located in the second receiving space in a direction facing the placement area 312. The pressing spring 350 may be provided at one end of the extending area 322 in the circumferential direction "C". Further, when observing the wheel assembly 10 parallel to the circumferential direction "C" from one side of the wheel assembly 10 in the radial direction "R", at least a part of the pressing bearing 340, at least a part of the central area 321, and at least a part of the pressing spring 350 may overlap each other. The pressing spring 350 may include a recessed area 351 and a contact area 352.

[0102] The recessed area 351 may have a shape in which the central area 321 is recessed in a direction facing the extending area 322. One end of the extending area 322 may be inserted into the recessed area 351. The recessed area 351 may be fixed to one end of the extending area 322. The recessed area 351 may define the central portion of the pressing spring 350.

[0103] The contact area 352 can extend generally along the axial direction "A" from the recessed area 351. For example, the contact area 352 can extend obliquely from the recessed area 351 to be closer to the central area 321 in the axial direction "A". For example, the contact area 352 can extend along the axial direction "A" from opposite ends of the recessed area 351 in the axial direction "A".

[0104] In addition, the end portions of the contact area 352 in the axial direction "A" can contact the pressing bearing 340. The contact area 352 can move elastically relative to the recessed area 351 along the circumferential direction "C". The contact area 352 can be a free end relative to the recessed area 351, and the recessed area 351 can be a fixed end relative to the contact area 352.

[0105] A plurality of pressing springs 350 can be provided. The plurality of pressing springs 350 can be arranged to be spaced apart from each other in the circumferential direction "C". The pressing spring 350 can include a first pressing spring 350-1 and a second pressing spring 350-2.

[0106] The first pressing spring 350-1 can be fixed to one end of the first extension area 322-1 in the first circumferential direction C1. The first pressing spring 350-1 can contact the first pressing bearing 341.

[0107] The second pressing spring 350-2 can be fixed to one end of the second extension area 322-2 in the second circumferential C2. The second pressing spring 350-2 can contact the second pressing bearing 342.

[0108] The first pressing spring 350-1 and the second pressing spring 350-2 can be arranged to be spaced apart from each other in the circumferential direction "C", wherein the second block 320 is between the first pressing spring and the second pressing spring. In addition, the first pressing spring 350-1 and the second pressing spring 350-2 can be arranged to be symmetric with respect to the fourth plane.

[0109] Return reference Figure 3 and Figure 4 The guiding unit 400 can guide the rotation of the wheel 200 relative to the motor 100. A plurality of guiding units 400 can be provided. The plurality of guiding units 400 can be arranged to be spaced apart from each other along the circumferential direction "C". For example, the plurality of braking modules 300 and the plurality of guiding units 400 can be arranged to be alternately spaced apart from each other along the circumferential direction "C". The guiding unit 400 can include a first guiding area 410, a second guiding area 420, and a guiding roller 430.

[0110] The first guiding region 410 may be connected to the outer circumferential surface of the motor 100. For example, the first guiding region 410 may be disposed on the base region 311. As an example, the first guiding region 410 may be integrally formed with the base region 311. The first guiding region 410 may include a first placement surface 411 and a second placement surface 412.

[0111] The first roller 431, which will be described later, may be placed on the first placement surface 411. For example, the first placement surface 411 may contact the first roller 431. The first placement surface 411 may extend obliquely in a first radial direction (such a direction of the radial direction "R" in which the motor 100 faces the wheel 200) so as to be inclined in a first axial direction (e.g., wedge-shaped). For example, the first placement surface 411 may extend obliquely such that the spacing distance from the motor 100 in the radial direction "R" increases as the first placement surface advances in the first axial direction.

[0112] The first axial direction may be defined as such a direction of the axial direction "A" in which the second placement surface 412 faces the first placement surface 411. For example, the first axial direction may be defined as such a direction of the axial direction "A" in which the intermediate motor 100 faces the first disk 510, which will be described later. In addition, the second axial direction may be defined as the direction opposite to the first axial direction.

[0113] The second roller 432, which will be described later, may be placed on the second placement surface 412. For example, the second placement surface 412 may contact the second roller 432. The second placement surface 412 may extend obliquely in the first radial direction so as to be inclined in the second axial direction. For example, the second placement surface 412 may extend obliquely such that the spacing distance from the motor 100 in the radial direction "R" increases as the second placement surface advances in the second axial direction. The second placement surface 412 may be disposed on a side closer to the second axial direction than the first placement surface 411.

[0114] By the inclinations formed on the first placement surface 411 and the second placement surface 412, separation of the second guiding region 420 and the guiding roller 430 from the first guiding region 410 in the axial direction "A" can be prevented. In other words, separation of the wheel 200 from the motor 100 in the axial direction "A" can be prevented by the inclinations formed on the first placement surface 411 and the second placement surface 412.

[0115] In addition, a roller placement space can be formed between the first placement surface 411 and the second placement surface 412 with respect to the axial direction "A", and a part of the guide roller 430 is located in the roller placement space. The roller placement space can have a shape in which the width in the axial direction "A" increases as the roller placement space advances in the first radial direction.

[0116] The guide roller 430 can be disposed between the first guide region 410 and the second guide region 420 with respect to the radial direction "R". The guide roller 430 can include a plurality of rollers. The plurality of rollers can include a first roller 431 and a second roller 432.

[0117] The first roller 431 can contact the first placement surface 411 and the second guide region 420. The first roller 431 can rotate about a first roller rotation axis (an imaginary straight line extending in the direction in which the first placement surface 411 extends). The first roller rotation axis can be formed to be inclined with respect to the reference rotation axis "X".

[0118] The second roller 432 can contact the second placement surface 412 and the second guide region 420. The second roller 432 can rotate about a second roller rotation axis (an imaginary straight line extending in the direction in which the second placement surface 412 extends). The second roller rotation axis can be formed to be inclined with respect to the reference rotation axis "X". In addition, the first roller rotation axis and the second roller rotation axis can intersect each other.

[0119] A plurality of disks 500 can be arranged on opposite sides of the motor 100 in the axial direction "A". The plurality of disks 500 can be arranged to be spaced apart from each other in the axial direction "A", with the motor 100 being located between these disks. The plurality of disks 500 can include a first disk 510 and a second disk 520.

[0120] The first disk 510 can be disposed on one side of the motor 100 in the first axial direction. The second disk 520 can be disposed on one side of the motor 100 in the second axial direction. The first disk 510 and the second disk 520 pass through the center of the wheel assembly 10 and can be arranged to be symmetric with respect to a plane perpendicular to the axial direction "A".

[0121] Hereinafter, referring back Figures 4 to 7 , the process of operating the brake module 300 will be described.

[0122] First, referring to Figure 5 , Figure 6 and Figure 7 , the process of operating the brake module 300 when the motor 100 stops will be described.

[0123] For example, when the wheel 200 rotates relative to the stationary motor 100 in the first circumferential direction C1 (or the second circumferential direction C2), the second block 320 can move relative to the first block 310 in the first circumferential direction C1 (or the second circumferential direction C2). The second block 320 can rotate by a rotation angle within a specific first range relative to the first block 310. This first range can be determined by the difference between the width of the guiding groove 321a in the circumferential direction "C" and the width of the guiding projection 310a in the circumferential direction "C". For example, since the width of the guiding groove 321a in the circumferential direction "C" is greater than the width of the guiding projection 310a in the circumferential direction "C", the first range can be determined to be larger.

[0124] Referring again to Figure 5 , when the second block 320 rotates or moves relative to the first block 310 in the first circumferential direction C1 (or the second circumferential direction C2), the first pressing bearing 341 (or the second pressing bearing 342) can move from the second accommodation space to the first accommodation space. When the first pressing bearing 341 (or the second pressing bearing 342) is located in the first accommodation space, the first pressing bearing 341 (or the second pressing bearing 342) can press the free end of the first spacer (or the free end of the second spacer) in the axial direction "A". When the free end of the first spacer (or the free end of the second spacer) is pressed in the axial direction "A", the free end of the first spacer (or the free end of the second spacer) can move along the axial direction "A" towards the disk 500 relative to the fixed end of the first spacer (or the fixed end of the second spacer).

[0125] When the free end of the first spacer (or the free end of the second spacer) moves towards the disk 500, the free end of the first spacer (or the free end of the second spacer) can press the disk 500 in the axial direction "A" to contact the disk 500. When the free end of the first spacer (or the free end of the second spacer) contacts the disk 500, due to the contact between the free end of the first spacer (or the free end of the second spacer) and the disk 500, a frictional force can occur between the free end of the first spacer (or the free end of the second spacer) and the disk 500. Due to the frictional force, the rotation of the disk 500 about the reference rotation axis "X" can be restricted. In addition, the rotation of the motor 100 fixed to the disk 500 about the reference rotation axis "X" can be restricted. Moreover, since the rotation of the wheel 200 supported by the non-rotating motor 100 about the reference rotation axis X is restricted when the second block 320 moves relative to the first block 310 to the maximum extent in the first circumferential direction C1 (or the second circumferential direction C2), the rotation of the wheel 200 about the reference rotation axis X can also be restricted.

[0126] Subsequently, referring back to Figure 4 , the process of operating the braking module 300 when the motor 100 is operating will be described.

[0127] For example, when the wheel 200 rotates relative to the operating motor 100 in the first circumferential direction C1 (or the second circumferential direction C2), the second block 320 may not move relative to the first block 310. As another example, when the wheel 200 rotates relative to the operating motor 100 in the first circumferential direction C1 (or the second circumferential direction C2), the second block 320 may rotate or move by a specific second range of rotational angles relative to the first block 310 in the first circumferential direction C1 (or the second circumferential direction C2). The second range may be smaller than the first range and may be determined by the elastic force of the pressing spring 350. For example, the second range may become smaller as the elastic modulus of the pressing spring 350 increases.

[0128] In this case, the plurality of pressing bearings 340 may be spaced apart from the free ends 332 of the plurality of shims in the axial direction "A" respectively. In other words, the free ends 332 of the plurality of shims may not be pressed in the axial direction "A". When the free ends 332 of the plurality of shims are not pressed in the axial direction "A", the free ends 332 of the plurality of shims may not press the first disk 510 and the second disk 520. Accordingly, the wheel 200 may rotate together with the motor 100 and the disks 500, and the vehicle may travel by the rotation of the wheel 200.

[0129] The wheel assembly according to an embodiment of the present disclosure may be applied to a small vehicle because the space required for installation may be minimized.

[0130] Figure 8 is a side view of a vehicle 800 incorporating an embodiment of the present disclosure as described above, for example, with respect to Figures 1 to 7 The vehicle 800 may have a body 802. The vehicle 800 may include a wheel assembly 803 configured to move the body 802. The vehicle 800 may include a wheel 200 configured to rotate about a reference rotation axis extending in the axial direction of the wheel assembly 803. The vehicle 800 may include a motor 100 configured to operate to provide rotational power to the wheel 200. The vehicle 800 may include a disk 500 connected to the motor 100 and configured to rotate about the reference rotation axis together with at least a part of the motor. The vehicle 800 may include a brake module 300 disposed between the wheel 200 and the motor 100 in the radial direction of the wheel assembly (see also Figures 1 to 7 ), and the radial direction may be perpendicular to the axial direction. The brake module 300 may be configured to: press the disk 500 in the axial direction when the wheel 200 rotates relative to the motor 100 (the motor stops operating), and be spaced apart from the disk 500 in the axial direction when rotational power is provided to the wheel 200 by the operation of the motor 100 (see also, for example, Figures 1 to 7 ).

[0131] In addition, the wheel assembly according to an embodiment of the present disclosure can reduce the cost required to provide a power source because the braking function can be operated only by the structural feature part without a separate power source.

[0132] In the above description, just because all the components constituting the exemplary embodiments of the present disclosure are described as being combined or operating in combination, the present disclosure does not necessarily have to be limited to the exemplary embodiments. That is, within the scope of the purpose of the present disclosure, all components can be operated in one or more selective combinations. In addition, the above terms such as "comprising", "including" or "having" may mean that the corresponding components may exist, and thus do not exclude other components, unless specifically stated to the contrary. Instead, it can be interpreted as being able to include other components. Unless otherwise defined, terms including technical or scientific terms may have the same meaning as commonly understood by those skilled in the art to which the present disclosure pertains. Terms such as those defined in a dictionary can be commonly used and can be interpreted as being consistent with the contextual meaning of the related art.

[0133] This application claims the benefit of Korean Patent Application No. 10-2023-0180175, filed on December 12, 2023, which is incorporated herein by reference.

[0134] The above description is an exemplary description of the technical spirit of the present disclosure, and those skilled in the art to which the present disclosure pertains can make various modifications and variations without departing from the features and scope of the present disclosure. Therefore, the exemplary embodiments disclosed in the present disclosure do not have to be used to limit the technical spirit of the present disclosure, but are used to describe these technical spirits, and the scope of the technical spirit of the present disclosure does not have to be limited by the exemplary embodiments. The protection scope of the present disclosure can be interpreted by the following claims, and all technical spirits within the equivalent scope can be interpreted as being included within the scope of the present disclosure.

[0135] Representative reference numerals:

[0136] 10: Wheel assembly 100: Motor 110: Rotor 120: Housing 130: Shaft 200: Wheel 210: Rim 220: Tire 300: Brake module 310: First block 310a: Guide projection 311: Base area 312: Placement area 312a: First surface 312b: Second surface 312c: Third surface 312-1: First placement area 312-2: Second placement area 320: Second block 320a: Accommodating space 321: Central area 322: Extension area 322-1: First extension area 322-2: Second extension area 322a: Inclined surface 322a-1: First inclined section 322a-2: Second inclined section 330: Brake pad 331: Pad fixed end 332: Pad free end 330-1: First brake pad 330-2: Second brake pad 340: Pressing bearing 341: First pressing bearing 342: Second pressing bearing 350: Pressing spring 351: Concave limit area 352: Contact area 350-1: First pressing spring 350-2: Second pressing spring 400: Guide unit 410: First guide area 411: First placement surface 412: Second placement surface 420: Second guide area 430: Guide roller 431: First roller 432: Second roller 500: Disc 510: First disc 520: Second disc

Claims

1. A wheel assembly, comprising: a wheel configured to rotate about a reference axis of rotation extending in an axial direction of said wheel assembly; a motor configured to provide rotational power to the wheels; a disk connected to the motor and configured to rotate about the reference axis of rotation with at least a portion of the motor; as well as a brake module, arranged between the wheel and the motor in a radial direction of the wheel assembly, wherein the radial direction is perpendicular to the axial direction, wherein the brake module is configured to press the disc in the axial direction when the wheel rotates relative to the motor when the operation of the motor is stopped, and wherein the brake module is configured to be spaced apart from the disc in the axial direction when the rotational power is provided to the wheel by the operation of the motor.

2. The wheel assembly according to claim 1, wherein: The brake module comprises: a first block fixed to the motor; a second block fixed to the wheel, wherein the second block is configured to move relative to the first block in a circumferential direction of the wheel assembly when the wheel rotates relative to the motor; and A brake pad is disposed to face the disk in the axial direction, wherein at least a portion of the brake pad is configured to press the disk when the second block moves.

3. The wheel assembly according to claim 2, further comprising: a guide protrusion extending in the radial direction of the wheel assembly and located in the first block or the second block; as well as a guide groove, wherein the guide protrusion is inserted into the guide groove in the second block in the radial direction when the guide protrusion is located in the first block, or the guide protrusion is inserted into the guide groove in the first block in the radial direction when the guide protrusion is located in the second block, wherein the guide groove and the guide protrusion extend along the circumferential direction of the wheel assembly, wherein the width of the guide groove in the circumferential direction is greater than the width of the guide protrusion in the circumferential direction, and Wherein, the guide protrusion is configured to move in the circumferential direction along the guide groove.

4. The wheel assembly according to claim 3, wherein: the motor faces the wheel in a first radial direction of the radial directions, wherein the guide protrusion has a shape protruding in the first radial direction, wherein the guide groove has a shape that is concave in the first radial direction, and The guide protrusion is inserted into the guide groove in the first radial direction.

5. The wheel assembly according to claim 3, wherein: An axial width of the guide groove and the guide protrusion in the axial direction is smaller than a circumferential width of the guide groove and the guide protrusion in the circumferential direction.

6. The wheel assembly according to claim 2, wherein: The brake pad also includes: a gasket fixing end fixed to one side of the second block in the axial direction; and The gasket free end extends from one side of the gasket fixed end in the circumferential direction, wherein the gasket free end is configured to move along the axial direction relative to the gasket fixed end.

7. The wheel assembly according to claim 6, in, The disc also includes: a first disk disposed outside the motor in the axial direction, and a second disk disposed on the inner side of the motor in the axial direction; Wherein, the brake pad comprises: a first brake pad configured to press the first disk toward the outer side in the axial direction, and a second brake pad configured to press the second disk toward the inner side in the axial direction; and The first brake pad and the second brake pad are arranged to be spaced apart from each other in the axial direction, and the second block is interposed between the first brake pad and the second brake pad.

8. The wheel assembly according to claim 2, wherein: The second block also includes: a central region defining a central portion of the second mass, wherein the central region is connected to the brake pad; and An extended area extends from the central area to one side in the circumferential direction, wherein the extended area is spaced apart from the brake pad in the axial direction, wherein the extended area includes an inclined surface, which extends obliquely so that the spacing distance from the brake pad in the axial direction becomes larger as the inclined surface becomes farther away from the central area.

9. The wheel assembly according to claim 8, wherein: The brake module also includes: A pressing bearing is configured to press the brake pad due to relative rotation of the wheel with respect to the motor, wherein the pressing bearing is accommodated in an accommodation space formed between the brake pad and the inclined surface of the extended area of ​​the second block.

10. The wheel assembly according to claim 9, wherein: When the wheel assembly is observed parallel to the axial direction from one side of the wheel assembly in the axial direction, at least a portion of the press bearing, at least a portion of the inclined surface of the extended area of ​​the second block, and at least a portion of the brake pad overlap each other.

11. The wheel assembly according to claim 9, wherein: The inclined surface comprises: a first inclined section, a first spacing distance from the brake pad to the first inclined section in the axial direction being equal to or smaller than a bearing width of the press bearing in the axial direction, and a second inclined section, wherein a second spacing distance from the brake pad to the second inclined section in the axial direction is greater than a width of the press bearing in the axial direction; Wherein, the accommodation space includes: a first accommodating space formed between the brake pad and the first inclined section, and A second accommodating space is formed between the brake pad and the second inclined section; and wherein the pressing bearing is configured to press the brake pad while contacting the brake pad when located in the first accommodation space, and wherein the pressing bearing is configured to be spaced apart from the brake pad when located in the second accommodation space.

12. The wheel assembly according to claim 11, wherein: The first block further comprises a seating area, which is located between the press bearing and the brake pad when the press bearing is in the second accommodation space, wherein the seating area defines a seating space for seating the press bearing, and The resettlement area includes: A first surface arranged to face the brake pad; and A second surface is located on an opposite side of the first surface in the axial direction, wherein the second surface is obliquely extended such that a spacing distance from the brake pad in the axial direction becomes smaller as the second surface becomes farther from the central area.

13. The wheel assembly according to claim 12, wherein: The brake module also includes: A pressing spring is provided at one end of the extended region in the circumferential direction, wherein the pressing spring is configured to press the pressing bearing in a direction facing the seating region when the pressing bearing is in the second accommodation space.

14. The wheel assembly according to claim 13, wherein: The pressing spring also includes: a recessed region into which the extended region is inserted, and the recessed region has a shape in which the central region is recessed in a direction facing the extended region, and A contact region extends obliquely to become closer to the central region as the contact region proceeds from the recessed region in the axial direction, and one end of the contact region in the axial direction is configured to contact the press bearing.

15. The wheel assembly according to claim 13, wherein: The placement area also includes: A third surface extends from the second surface in the axial direction, wherein the third surface is arranged to face the pressing spring in the circumferential direction.

16. The wheel assembly according to claim 2, wherein: The first block is fixed to the outer peripheral surface of the motor, and Wherein, the second block is fixed to the inner peripheral surface of the wheel.

17. The wheel assembly according to claim 2, wherein: Each of the first block and the second block has a symmetrical shape with respect to the axial direction.

18. The wheel assembly according to claim 17, wherein: Each of the first block and the second block has a symmetrical shape with respect to the circumferential direction.

19. The wheel assembly according to claim 18, wherein: The brake module also includes: a plurality of pressing bearings configured to press the brake pad due to relative rotation of the wheel with respect to the motor, and The plurality of press bearings are provided to be spaced apart from each other between the first block and the second block, and the plurality of press bearings are arranged to be symmetrical with respect to the axial direction and the circumferential direction.

20. The wheel assembly of claim 1, further comprising: A shaft passes through the center of the motor and the center of the disk and defines the reference rotation axis.

21. A wheel assembly comprising: a wheel configured to rotate about a reference axis of rotation extending in an axial direction of said wheel assembly; a motor configured to provide rotational power to the wheels; a disk connected to the motor and configured to rotate about the reference axis of rotation with at least a portion of the motor; a brake module disposed between the wheel and the motor in a radial direction of the wheel assembly, the radial direction being perpendicular to the axial direction, wherein the brake module is configured to press the disc in the axial direction when the wheel rotates relative to the motor in a state where the operation of the motor is stopped, and wherein the brake module is configured to be spaced apart from the disc in the axial direction when the rotational power is provided to the wheel by the operation of the motor; and A guide unit is provided between an outer peripheral surface of the motor and an inner peripheral surface of the wheel and is configured to guide relative rotation of the wheel with respect to the motor.

22. The wheel assembly according to claim 21, wherein: The guiding unit further comprises: a first guide region connected to the outer peripheral surface of the motor; a second guide region connected to the inner peripheral surface of the wheel and spaced apart from the first guide region in a radial direction of the wheel assembly; and A guide roller is disposed between the first guide area and the second guide area in the radial direction and is configured to guide movement of the second guide area relative to the first guide area in the circumferential direction of the wheel assembly.

23. The wheel assembly according to claim 22, wherein: The guide roller further includes a first roller and a second roller spaced apart from each other along the axial direction; Wherein, the first guide area includes: a first seating surface on which the first roller is seated, and a second seating surface on which the second roller is seated; wherein, in the axial direction, a roller placement space is formed between the first placement surface and the second placement surface, and a portion of the guide roller is located in the roller placement space; wherein the motor faces the wheel in a first radial direction of the radial directions; and The roller housing space has a roller housing space shape whose width in the axial direction becomes larger as the roller housing space shape proceeds in the first radial direction.

24. The wheel assembly according to claim 23, wherein: the second seating surface faces the first seating surface in a first axial direction of the axial directions, and wherein the second axial direction is opposite to the first axial direction, wherein the first seating surface extends obliquely to have a first shape, and a first spacing distance of the first shape from the motor in the radial direction increases as the first seating surface goes in the first axial direction; The second seating surface extends obliquely to have a second shape whose second spacing distance from the motor in the radial direction becomes larger as the second seating surface proceeds in the second axial direction, wherein the first roller is configured to rotate about a first roller rotation axis, the first roller rotation axis extending in a first direction in which the first seating surface extends, and The second roller extends in a second direction in which the second seating surface extends, and the second roller is configured to rotate about a second roller rotation axis that intersects the first roller rotation axis.

25. The wheel assembly of claim 21, wherein: A plurality of the guide units and a plurality of the brake modules are provided, and Wherein, a plurality of the guide units and a plurality of the brake modules are alternately arranged along a circumferential direction of the wheel assembly.

26. A vehicle comprising: Car body; as well as A wheel assembly configured to move the vehicle body, wherein the wheel assembly comprises: a wheel configured to rotate about a reference axis of rotation extending in an axial direction of said wheel assembly, a motor configured to provide rotational power to the wheels, a disk connected to the motor and configured to rotate with at least a portion of the motor about the reference rotation axis, and a brake module, arranged between the wheel and the motor in a radial direction of the wheel assembly, wherein the radial direction is perpendicular to the axial direction, wherein the brake module is configured to press the disc in the axial direction when the wheel rotates relative to the motor when the operation of the motor is stopped, and wherein the brake module is configured to be spaced apart from the disc in the axial direction when the rotational power is provided to the wheel by the operation of the motor.

Images