KR102640133B1 - Size variable wheel - Google Patents

Abstract

According to one aspect of the invention, a hub disposed at the center of a wheel; a plurality of rims arranged in a circle around the hub to form a circumference of the wheel; a plurality of spokes extending radially from the hub, respectively coupled to the plurality of rims, and expanding and contracting with respect to the center of the wheel; A size-adjustable wheel is provided, including a rotation inducing unit interposed between the spokes and the rim and rotating the rim about the axis of the spokes as the spokes expand and contract.

Description

Size variable wheel}

The present invention relates to wheels of adjustable size. More specifically, it relates to wheels whose size is adjusted to ensure smooth movement of the means of transportation depending on the situation during the movement of the means of transportation.

The wheel is one of mankind's greatest inventions, estimated to have been in use since around 4000 BC. These wheels are developed and used in various forms depending on the size and weight of the means of transportation, or the path or road conditions on which the means of transportation travel.

However, most wheels are attached to a means of transportation with their size (diameter) fixed, and as a result, their ability to respond to the smooth movement of the means of transportation is reduced depending on the type of the means of transportation, the path the means of transportation travels, or road conditions. there is a problem. For example, in the case of a travel carrier, there is no major problem in moving it with small wheels on a flat road such as an airport or terminal, but on a bumpy road or a road with a lot of gravel, it is difficult to move the travel carrier smoothly due to the small wheels.

Therefore, there is a need for technology that can vary the size of the wheels to ensure smooth movement during the movement of the means of transportation depending on the situation.

Republic of Korea Patent Publication No. 10-2018-0098461 (published on September 4, 2018)

The present invention seeks to provide a wheel whose size can be adjusted for smooth movement of the means of transportation depending on the situation during the movement of the means of transportation.

The goal is to provide a size-adjustable wheel that rolls smoothly by maintaining a constant curvature of the rim that makes up the circumference of the wheel even if the diameter of the wheel is reduced or increased.

According to one aspect of the invention, a hub disposed at the center of a wheel; a plurality of rims arranged in a circle around the hub to form a circumference of the wheel; a plurality of spokes extending radially from the hub, respectively coupled to the plurality of rims, and expanding and contracting with respect to the center of the wheel; A size-adjustable wheel is provided, including a rotation inducing unit interposed between the spokes and the rim and rotating the rim about the axis of the spokes as the spokes expand and contract.

The hub includes a hub shaft penetrating the center of the wheel; It includes a pair of hub cylinders through which the hub axis penetrates and moves relatively along the hub axis. In this case, the spokes are coupled in an 'X' shape around a first hinge pin and have ends that are connected to the pair of hub barrels. It may include a first link bar and a second link bar respectively linked to the hub barrel.

The rotation inducing unit includes a rim rotation axis extending downward from a lower portion of the rim; a pair of rotation inducing parts that face each other and are coupled around the rim rotation axis; It includes a third link bar and a fourth link bar, one end of which is coupled to the first link bar and the second link bar, respectively, by a second hinge pin, and the other end of which is coupled to the rotation inducing part, respectively, by a third hinge pin, The rotation guide unit rotates around the third hinge pin according to the operation of the first link bar and the second link bar, and as the rotation guide unit rotates, the rim rotation axis is rotated in a direction perpendicular to the rotation direction of the rotation guide unit. It can be rotated.

The rim rotation shaft is cylindrical, and an indentation groove is formed on the outer circumference of the rotation inducing portion corresponding to the cylindrical shape. A pair of rotation setting pins extend on both sides of the outer circumference of the rim rotation shaft, and the rotation setting pins are in the indentation groove. is inserted to form a guide groove that rotates the rim rotation axis in a direction perpendicular to the rotation direction of the rotation guiding part as the rotation guiding part rotates.

Inclined surfaces may be formed at ends of the rims that face each other in accordance with the rotation direction of the rims.

The size-adjustable wheel may further include a reinforcing strut that reinforces the rigidity of at least one of the first link bar and the second link bar.

The size-adjustable wheel further includes a reinforcing arm having a rotating ring into which the rim rotating shaft is inserted and a pair of connecting rods extending from the rotating ring to both sides, wherein the connecting rods adjacent to each other have ends that are links. can be connected

The size of the wheel whose size is adjustable according to an embodiment of the present invention can be adjusted in size to ensure smooth movement of the means of transportation depending on the situation during the movement of the means of transportation.

Additionally, even if the diameter of the wheel is reduced or increased, the rim that makes up the circumference of the wheel maintains a constant curvature and can roll smoothly.

Figure 1 is a perspective view showing a state in which the size of a wheel whose size is adjusted is expanded according to an embodiment of the present invention.
Figure 2 is a perspective view showing a reduced size of a wheel whose size is adjusted according to an embodiment of the present invention.
Figure 3 is a perspective view showing a state in which the size of the unit module of a wheel whose size is adjusted according to an embodiment of the present invention is expanded.
Figure 4 is a perspective view showing a state in which the size of a unit module of a wheel whose size is adjusted according to an embodiment of the present invention is reduced.
Figure 5 is a diagram illustrating a rotation inducing unit of a wheel whose size is adjusted according to an embodiment of the present invention.
Figure 6 is a diagram for explaining the coupled state of the rim of a wheel whose size is adjusted according to an embodiment of the present invention.
Figure 7 is a perspective view of a wheel whose size is adjustable according to another embodiment of the present invention.
Figure 8 is a view showing a reinforcing arm of a wheel whose size is adjustable according to another embodiment of the present invention.

Since the present invention can be modified in various ways and can have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all transformations, equivalents, and substitutes included in the spirit and technical scope of the present invention. In describing the present invention, if it is determined that a detailed description of related known technologies may obscure the gist of the present invention, the detailed description will be omitted.

Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

Hereinafter, the size-adjustable wheel according to the present invention will be described in detail with reference to the attached drawings. In the description with reference to the attached drawings, identical or corresponding components are assigned the same drawing numbers and duplicates thereof. Any necessary explanation will be omitted.

Figure 1 is a perspective view showing a state in which the size of a wheel whose size is adjusted according to an embodiment of the present invention is expanded, and Figure 2 is a state where the size of a wheel whose size is adjusted according to an embodiment of the present invention is reduced. It is a perspective view showing . And, Figure 3 is a perspective view showing a state in which the size of the unit module of the wheel whose size is adjusted according to an embodiment of the present invention is expanded, and Figure 4 is a view of the wheel whose size is adjusted according to an embodiment of the present invention. This is a perspective view showing the size of the unit module reduced. And, Figure 5 is a diagram for explaining the rotation module of the wheel whose size is adjusted according to an embodiment of the present invention, and Figure 6 is a diagram showing the coupled state of the rim of the wheel whose size is adjusted according to an embodiment of the present invention. This is a drawing for explanation.

1 to 6, a unit module 11, a rim 12, a hub shaft 14, a hub barrel 16, a hub 18, a spoke 20, and a rotating Guidance unit 22, first hinge pin 24, first link bar 26, second link bar 28, rim rotation axis 30, rotation guide part 32, second hinge pin 34, The third link bar 36, the fourth link bar 38, the third hinge pin 40, the rotation setting pin 42, the recessed groove 44, the guide groove 46, and the inclined surface 48 are shown. there is.

The size-adjustable wheel according to this embodiment includes a hub 18 disposed at the center of the wheel; a plurality of rims 12 arranged in a circle around the hub 18 to form a circumference of the wheel; a plurality of spokes (20) extending radially from the hub (18), each coupled to the plurality of rims (12), and expanding and contracting with respect to the center of the wheel; It includes a rotation inducing unit 22 that is interposed between the spokes 20 and the rim 12 and rotates the rim 12 about the axis of the spokes 20 as the spokes 20 expand and contract. .

The hub 18 is a central axis around which a plurality of spokes 20 radially disposed at the center of the wheel gather, and the hub 18 according to this embodiment is disposed across the center of the circular wheel.

According to this embodiment, as shown in Figures 1 and 2, the hub axis 14 penetrates the center of the wheel, and the hub axis 14 penetrates the hub axis 14. ) may include a pair of hub barrels (16) that move relatively along.

The hub shaft 14 has a cylindrical shape, and an axle (not shown) of a moving means passes through it, so that the wheel according to the present embodiment can rotate around the axle.

Referring to Figures 1 and 2, a male thread is formed on the outer periphery of the hub shaft 14 and is screwed to the male thread of the hub shaft 14 inside the hub barrel 16 through which the hub shaft 14 penetrates. A female thread may be formed, and as the hub shaft 14 rotates, the hub barrels 16 facing each other along the longitudinal direction of the hub shaft 14 may be moved to be relatively distant or closer to each other.

The plurality of rims 12 are arranged in a circle around the hub 18 and form the circumference of the wheel. According to this embodiment, the rim 12 forming the circumference of the wheel is segmented into a plurality of pieces, and as the spokes 20, which will be described later, expand and contract, the plurality of rims 12 each rotate around the spokes 20 to move the wheel. The size may be reduced or expanded.

The rim 12 is in the shape of an arc, and a plurality of rims 12 in the shape of an arc are gathered together to form the circumference of a round wheel. Rubber, etc. may be combined on the outer peripheral surface of the rim 12 to absorb vibrations caused by movement of the moving means.

The number of segments of the plurality of rims 12 forming the circumference of the wheel can be determined as needed, and in this embodiment, a segmented form of eight rims 12 is presented.

The plurality of spokes 20 extend radially from the hub 18, are respectively coupled to the plurality of rims 12, and are expanded and contracted with respect to the center of the wheel. The spokes 20 are a structure for transmitting the load applied from the axle of the moving means to the rim 12, and extend radially around the hub 18 to which the axle is coupled. In this embodiment, the number of spokes 20 and the number of segmented rims 12 are matched, so that the ends of each spoke 20 extending from the hub 18 are positioned at the center of the corresponding rim 12. It was designed to be combined.

One spoke (20) is connected to a corresponding rim (12) to form a unit module (11), and each unit module (11) is interlocked according to the relative movement of the hub cylinders (16) facing each other. and it works. The operation of the unit module 11 is described in detail below.

Meanwhile, the spokes 20 according to this embodiment can be extended or contracted with respect to the center of the wheel. When the length of the spokes 20 is extended from the center of the wheel, the size of the wheel is expanded and the length of the spokes 20 is increased. If is reduced, the size of the wheel is reduced.

In order to expand or contract the spokes 20, each spoke 20 is configured in a telescope form to expand or contract by drawing in and out cylindrical members with different diameters in the longitudinal direction, or, as in the present embodiment, a central The spokes 20 can be extended or shortened by combining the two link bars 26 and 28 in an 'X' shape around the hinge pin 24.

As shown in FIG. 3, the spokes 20 according to the present embodiment are coupled in an 'X' shape centered on the first hinge pin 24, and the ends are each link coupled to a pair of hub barrels 16. It may include a first link bar 26 and a second link bar 38. In this case, when the opposing hub barrels 16 approach each other, the first link bar 26 and the second link bar 38 are retracted around the first hinge pin 24 to move the spokes 20. When the overall length is extended and the opposing hub barrels 16 move away from each other, the first link bar 26 and the second link bar 38 spread around the first hinge pin 24 and the spokes 20 The overall length of can be reduced.

The rotation inducing unit 22 is interposed between the spokes 20 and the rim 12 and induces rotation of the rim 12 about the axis of the spokes 20 as the spokes 20 expand and contract.

Referring to Figures 1 and 2, when the spokes 20 are expanded as shown in Figure 1, a plurality of rims 12 are unfolded and connected to each other to form a large circular wheel, as shown in Figure 2. When the spokes 20 are reduced, the plurality of rims 12 rotate simultaneously about the axis of the spokes 20 to form a small wheel.

As the spokes 20 are reduced and the size of the wheel is reduced, the curvature of the circle connecting the centers of the rotating rims 12 (outermost of the reduced wheel) increases at a certain rate, and thus the reduced wheel By forming a complete circle, the wheels can rotate smoothly when the means of transportation is moved.

The rotation induction unit 22 is linked to the expansion and contraction of the spokes 20 and induces the degree of rotation of the rim 12, thereby rotating to match the degree of contraction of the spokes 20 and keeping the curvature of the wheel formed by the rim 12 constant. Let it increase steadily.

As described above, the rotation inducing unit 22 according to the present embodiment includes, as shown in FIGS. 3 and 5, a rim rotation axis 30 extending downward from the lower part of the rim 12; A pair of rotation inducing portions 32 coupled to each other while facing each other about the rim rotation axis 30; One end is coupled to the first link bar 26 and the second link bar 28 by a second hinge pin 34, and the other end is coupled to the rotation inducing portion 32 by a third hinge pin 40. It may include a third link bar 36 and a fourth link bar 38.

In this configuration, as shown in FIGS. 4 and 5, the rotation inducing portion 32 centers around the third hinge pin 40 according to the operation of the first link bar 26 and the second link bar 28. and the rim rotation axis 30 can be rotated in a direction perpendicular to the rotation direction of the rotation guidance unit 32 according to the rotation of the rotation guidance unit 32.

FIG. 5 is a diagram illustrating the rotation inducing unit 22 of a wheel whose size is adjusted according to the present embodiment. Referring to FIG. 5, the rim rotation shaft 30 extending downward from the lower part of the rim 12 has a cylindrical shape. And, a recessed groove 44 is formed on the outer circumference of the rotation guide portion 32 facing the rim rotation axis 30, corresponding to a cylindrical shape. In addition, a pair of rotation setting pins 42 extend on both sides of the outer periphery of the rim rotation shaft 30, and the rotation setting pins 42 are inserted into the recessed grooves 44 of the rotation inducing portion 32 to form the rotation inducing portion 32. ), a guide groove 46 is formed that rotates the rim rotation axis 30 in a direction perpendicular to the rotation direction of the rotation guide 32.

Referring to FIG. 4, when the hub barrels 16 opposing each other with respect to the hub axis 14 are separated from each other, the first link bar 26 and the second link bar 28 are centered around the first hinge pin 24. ) As the ends of the spokes (20) spread out, the length of the spokes (20) is reduced. As both ends of the first link bar 26 and the second link bar 28 are spread apart, one end of the first link bar 26 and the second link bar is centered on the second hinge pin 34. As the other ends of the third link bar 36 and the fourth link bar 38, which are coupled to each other, are retracted inward, the rotation guide portions 32 opposing each other are rotated inward around the third hinge pin 40. As the rotation guide part 32 rotates, the rim rotation axis 30 is aligned in the rotation direction of the rotation guide part 32 by the rotation setting pins 42 inserted into the guide grooves 46 of the rotation guide parts 32 facing each other. As it rotates in a direction perpendicular to the rim 12 coupled to the rim rotation axis 30, the rim 12 rotates.

In the above manner, as the spokes 20 of each unit module 11 are reduced, as shown in FIG. 2, each rim 12 rotates at a certain angle so that the side ends come into contact with each other, thereby reducing the size of the wheel. is reduced, and at this time, the curvature of the circle (outermost of the reduced wheel) connecting the centers of the rotating rims 12 increases at a certain rate according to the reduced size of the spokes 20, making the outer circumference of the wheel circular. .

Figure 6 is a diagram for explaining the coupled state of the rim 12 of a wheel whose size is adjusted according to this embodiment. As the length of the spokes 20 is reduced according to the above-described method, interference may occur at the ends of the rims 12 that face each other when each rim 12 rotates. Accordingly, in consideration of the rotation direction and rotation angle of the rim 12, an inclined surface 48 can be formed at the ends of the rims 12 facing each other corresponding to the rotation direction of the rim 12.

Referring to FIG. 6, as each rim 12 rotates, the ends of the rims 12 are spaced apart along the inclined surface 48 of the ends of the adjacent rims 12, allowing the rims 12 to rotate without mutual interference. It can happen.

Figure 7 is a perspective view of a wheel whose size is adjustable according to another embodiment of the present invention, and Figure 8 is a diagram showing a reinforcing arm of a wheel whose size is adjustable according to another embodiment of the present invention.

7 and 8, a rim 12, a hub 18, a spoke 20, a rim rotation axis 30, a rotation ring 50, a connecting rod 52, and reinforcement. A strut 54, a reinforcing arm 56, and a link connection 58 are shown.

According to one embodiment of the size-adjustable wheel described above, as shown in FIGS. 3 and 4, a unit module 11 composed of each spoke 20 and a rim 12 centered on a hub 18. These are separated from each other.

In this case, when the wheels are driven according to the rotation of the axle of the moving means, a large shear stress is generated in the spokes 20 of each unit module 11 adjacent to the hub 18, which may cause damage. Therefore, it is necessary to reinforce the spokes 20 to increase the rigidity of each spoke 20.

In this embodiment, as shown in FIG. 7, in order to increase the rigidity of each spoke 20, at least one of the first link bar 26 and the second link bar 28 constituting the spoke 20 A form in which a reinforcing strut (54) is added is presented.

Referring to Figures 3 and 7, the spoke 20 according to this embodiment inserts the first link bar 26 between a pair of second link bars 28 and the first hinge pin 24. It is a form formed by connecting links to form an

Meanwhile, since the unit module 11 consisting of the spokes 20 and the rim 12 is separated from each other around the hub 18, the load generated on the wheel is not distributed to the entire wheel but is concentrated on the unit module 11. It can be. Therefore, it is necessary to distribute the load applied to the wheel to the entire wheel by connecting each unit module 11 to each other to form an integrated structure. For this purpose, as shown in FIG. 7, a form in which the reinforcing arm 56 connecting adjacent unit modules 11 is reinforced is presented.

Looking in more detail, the reinforcing arm 56 according to the present embodiment has a rotating ring 50 into which the rim rotating shaft 30 is inserted, as shown in FIG. 8, and as long as it extends on both sides from the rotating ring 50. It is provided with a pair of connecting rods (52).

As shown in FIG. 7, with the rotating ring 50 of the reinforcing arm 56 inserted into the rim rotating shaft 30, the end of the connecting rod 52 is connected to the connecting rod 52 of the adjacent reinforcing arm 56. By connecting the and links to form the link connection portion 58, the wheels can operate as one unit.

With this configuration, when the size of the wheel is reduced, the reinforcing arms 56 connected to each other are folded in a zigzag shape at the link connection portion 58 and can be reduced to correspond to the size of the wheel.

Although the embodiments of the present invention have been described above, the spirit of the present invention is not limited to the embodiments presented in this specification, and those skilled in the art who understand the spirit of the present invention can add components within the scope of the same spirit. , other embodiments can be easily proposed by change, deletion, addition, etc., but this will also be said to be within the scope of the present invention.

11: unit module 12: rim
14: hub shaft 16: hub barrel
18: hub 20: spoke
22: rotation guidance unit 24: first hinge pin
26: first link bar 28: second link bar
30: Rim rotation axis 32: Rotation guide unit
34: second hinge pin 36: third link bar
38: fourth link bar 40: third hinge pin
42: Rotation setting pin 44: Embedded groove
46: Guide groove 48: Inclined surface
50: Swivel ring 52: Connecting rod
54: reinforcing strut 56: reinforcing arm
58: link connection

Claims (7)

A hub disposed at the center of the wheel;
a plurality of rims arranged in a circle around the hub to form a circumference of the wheel;
a plurality of spokes extending radially from the hub, respectively coupled to the plurality of rims, and expanding and contracting with respect to the center of the wheel;
It includes a rotation inducing unit interposed between the spoke and the rim to rotate the rim about the axis of the spoke according to expansion and contraction of the spoke,
The herb is,
a hub shaft penetrating the center of the wheel;
It includes a pair of hub barrels through which the hub axis moves relatively along the hub axis,
The spokes are:
It includes a first link bar and a second link bar that are coupled in an 'X' shape around a first hinge pin and whose ends are linked to the pair of hub barrels, respectively,
The rotation induction unit,
a rim rotation axis extending downward from a lower portion of the rim;
a pair of rotation inducing parts that face each other and are coupled around the rim rotation axis;
It includes a third link bar and a fourth link bar, one end of which is coupled to the first link bar and the second link bar, respectively, by a second hinge pin, and the other end of which is coupled to the rotation inducing part, respectively, by a third hinge pin,
The rotation guide unit rotates around the third hinge pin according to the operation of the first link bar and the second link bar, and as the rotation guide unit rotates, the rim rotation axis is rotated in a direction perpendicular to the rotation direction of the rotation guide unit. A wheel whose size is adjustable, characterized in that it rotates.
delete delete According to paragraph 1,
The rim rotation axis is cylindrical,
A recessed groove is formed on the outer periphery of the rotation guide portion corresponding to the cylindrical shape,
A pair of rotation setting pins extend on both sides of the outer periphery of the rim rotation axis,
A wheel whose size is adjustable, wherein a guide groove is formed in the indented groove to rotate the rim rotation axis in a direction perpendicular to the rotation direction of the rotation guide according to the rotation of the rotation guide by inserting the rotation setting pin. .
According to paragraph 1,
A wheel whose size is adjustable, characterized in that inclined surfaces are formed at ends of the rims that face each other in accordance with the rotation direction of the rims.
According to paragraph 1,
A wheel whose size is adjustable, further comprising a reinforcing strut that reinforces the rigidity of at least one of the first link bar and the second link bar.
According to paragraph 1,
Further comprising a reinforcing arm having a rotating ring into which the rim rotating shaft is inserted and a pair of connecting rods extending from the rotating ring to both sides,
A size-adjustable wheel, characterized in that the connecting rods adjacent to each other are linked at their ends.