TWI839982B - Elastic shock absorbing wheel - Google Patents

Abstract

The utility model relates to an elastic shock absorber wheel, which comprises a first round ring formed with an axle hole, and the outer surface of the first round ring is formed with a first group of setting surfaces; A first elastic layer, the inner surface is formed with a first relative group of surface, the outer surface is formed with a second group of surface, the first elastic layer with the first relative group of surface is arranged on the outside of the first ring; A second ring, the inner surface molding has a second set of relative face, the outer surface molding has a third set of face, the second ring with the second relative set of face is arranged outside the first elastic layer; And a second elastic layer, the inner surface is formed with a third relative group of surface, the second elastic layer is combined with the third relative group of surface and the third group of surface, so that the second elastic layer is set outside the second ring.

Description

Shock absorber wheel

The present invention relates to a shock-absorbing wheel. More specifically, the present invention relates to a wheel structure having a multi-layer structure for effectively absorbing shock.

Solid tires have the advantages of no inflation, puncture resistance, and explosion-proof, and have been widely used in various fields. The performance parameters of tires include their pressure resistance, shock absorption performance, and adaptability to different road conditions. Solid tires have stronger pressure resistance due to their inherent structural characteristics, but relatively weak shock absorption performance. In the prior art, solid tires are ground-contact rolling toroidal elastic rubber products assembled on various transport tracks, carts, or rehabilitation equipment. They are usually installed on metal wheels, can support the vehicle body, cushion external impacts, achieve contact with the ground and ensure the vehicle's driving performance. Tires are often used under complex and harsh conditions. They are subjected to various deformations, loads, forces, and high and low temperature effects while driving, so they must have higher load-bearing performance, traction performance, and cushioning performance.

However, traditional solid tires have a simple structure, low elasticity, and no shock absorption function. When used on bumpy roads, they will cause a great sense of bumps and are uncomfortable to use. Therefore, an improvement plan must be proposed.

In view of the above, it is necessary to provide a shock-absorbing wheel with better shock-absorbing ability.

According to the present invention, a shock absorbing wheel is provided, which comprises: a first wheel rim having an axle hole formed therein, and a first assembly surface formed on the outer surface of the first wheel rim; a first elastic layer having a first opposite assembly surface formed on the inner surface and a second assembly surface formed on the outer surface, the first elastic layer being combined with the first assembly surface by the first opposite assembly surface, so that the first elastic layer is sleeved on the outer surface of the first wheel rim; a second wheel rim having an inner surface and an outer surface; A second relative assembly surface is formed on the inner surface, a third assembly surface is formed on the outer surface, the second rim is combined with the second assembly surface by the second relative assembly surface, so that the second rim is set outside the first elastic layer; and a second elastic layer, a third relative assembly surface is formed on the inner surface, the second elastic layer is combined with the third relative assembly surface by the third relative assembly surface, so that the second elastic layer is set outside the second rim.

In one embodiment, a rectangular groove is formed on the first assembly surface surrounding the first rim, and a rectangular protrusion that can match the rectangular groove is formed on the first opposite assembly surface surrounding the first elastic layer.

In one embodiment, a first rectangular groove is formed on the first assembly surface surrounding the first rim, a second rectangular groove is formed on the second opposite assembly surface surrounding the second rim, and a first rectangular convex block and a second rectangular convex block are formed on the first opposite assembly surface and the second assembly surface surrounding the first elastic layer, respectively, opposite to the first rectangular groove and the second rectangular groove.

In one embodiment, a rectangular convex block is formed on the second assembly surface surrounding the first elastic layer, and a rectangular groove that can match the rectangular convex block is formed on the second opposite assembly surface surrounding the second rim.

In one embodiment, a first arc-shaped groove is formed on the first assembly surface surrounding the first rim, a second arc-shaped groove is formed on the second opposite assembly surface surrounding the second rim, and a first arc-shaped convex block and a second arc-shaped convex block are formed on the first opposite assembly surface and the second assembly surface surrounding the first elastic layer, respectively, relative to the first arc-shaped groove and the second arc-shaped groove.

In one embodiment, the first arc-shaped groove, the second arc-shaped groove, the first arc-shaped protrusion, and the second arc-shaped protrusion are biased toward one side of the shock-absorbing wheel.

In one embodiment, the shock-absorbing wheel further includes a third wheel rim and a third elastic layer.

The present invention further provides another wheel body for a shock-absorbing wheel, comprising: a first wheel rim, formed with an axle hole, and a first assembly surface formed on the outer surface of the first wheel rim; a first elastic layer, formed with a first opposite assembly surface on the inner surface, and a second assembly surface formed on the outer surface, the first elastic layer is combined with the first assembly surface by the first opposite assembly surface, so that the first elastic layer is sleeved on the outside of the first wheel rim; a second wheel rim, formed with a second opposite assembly surface on the inner surface, and a third assembly surface formed on the outer surface, the second wheel rim is combined with the second opposite assembly surface by the second assembly surface, so that the second wheel rim is sleeved on the outside of the first elastic layer; a second elastic layer A layer, a third opposite assembly surface is formed on the inner surface, a fourth assembly surface is formed on the outer surface, the second elastic layer is combined with the third assembly surface by the third opposite assembly surface, so that the second elastic layer is sleeved on the outside of the second rim; a third rim, a fourth opposite assembly surface is formed on the inner surface, a fifth assembly surface is formed on the outer surface, the third rim is combined with the fourth opposite assembly surface, so that the second rim is sleeved on the outside of the second elastic layer; and a third elastic layer, a fifth opposite assembly surface is formed on the inner surface, the third elastic layer is combined with the fifth opposite assembly surface by the fifth opposite assembly surface, so that the third elastic layer is sleeved on the outside of the third rim.

The present invention further provides another shock-absorbing wheel, comprising: a first wheel rim, formed with an axle hole, and a first assembly surface formed on the outer surface of the first wheel rim; an elastic layer, with a first opposite assembly surface formed on the inner surface and a second assembly surface formed on the outer surface, the elastic layer is combined with the first opposite assembly surface to make the elastic layer sleeved on the outside of the first wheel rim; and a second wheel rim, with a second opposite assembly surface formed on the inner surface, the second wheel rim is combined with the second opposite assembly surface to make the second wheel rim sleeved on the outside of the elastic layer.

Through the above method, the shock-absorbing wheel itself enhances the overall shock-absorbing ability through the multi-layer structure design to provide more shock-absorbing force during use.

10: shock-absorbing wheel

101: First lap

1011: shaft hole

1012: The first set of faces

102: First elastic layer

1021: The first relative group setting surface

1022: The second set of faces

103: Second round

1031: The second relative group setting surface

1032: The third set of faces

104: Second elastic layer

1041: The third relative group setting surface

105: Side

11: Rectangular groove

12: Rectangular convex block

13: The first rectangular groove

14: Second rectangular groove

15: The first rectangular convex block

16: Second rectangular convex block

21: First arc groove

22: Second arc groove

23: First arc-shaped convex block

24: Second arc-shaped convex block

30: shock absorber wheel

301: First lap

3011: shaft hole

3012: The first set of faces

3013: The first rectangular groove

302: First elastic layer

3021: The first relative group setting surface

3022: The second set of faces

3023: First rectangular convex block

303: Second round

3031: The second relative group setting surface

3032: The third set of faces

304: Second elastic layer

3041: The third relative group setting

3042: The fourth set of faces

3043: Second rectangular protrusion

305: The third round

3051: The fourth relative group setting

3052: The fifth set of faces

3053: Second rectangular groove

306: The third elastic layer

3061: Fifth relative group setting

40: shock-absorbing wheel

401: First lap

4011: Shaft hole

4012: The first set of faces

402: Elastic layer

4021: The first relative group setting surface

4022: The second set of faces

403: Second round

4031: The second relative group setting

In order to more clearly explain the implementation of this application or the technical solution in the prior art, the following will briefly introduce the drawings required for the implementation or the prior art description. Obviously, the drawings described below are only some implementations of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

Figure 1 is a three-dimensional appearance diagram of the shock-absorbing wheel of the present invention.

Figure 2 is a schematic diagram of the decomposition of the present invention.

Figure 3 is a cross-sectional view of the present invention.

Figure 4 is a schematic diagram of another embodiment (I) of the present invention.

Figure 5 is a cross-sectional view of embodiment (I) of the present invention.

Figure 6 is a schematic diagram of another embodiment (II) of the present invention.

Figure 7 is a cross-sectional view of embodiment (II) of the present invention.

Figure 8 is a schematic diagram of another embodiment (three) of the present invention.

Figure 9 is a cross-sectional view of embodiment (three) of the present invention.

Figure 10 is a schematic diagram of another embodiment (IV) of the present invention.

Figure 11 is a cross-sectional view of embodiment (IV) of the present invention.

Figure 12 is a schematic diagram of another embodiment (fifth) of the present invention.

Figure 13 is a cross-sectional view of embodiment (V) of the present invention.

Figure 14 is a three-dimensional external view of another embodiment (six) of the present invention.

Figure 15 is a schematic diagram of the decomposition of the sixth embodiment of the present invention.

Figure 16 is a cross-sectional view of embodiment (six) of the present invention.

Figure 17 is a three-dimensional external view of the seventh embodiment of the present invention.

Figure 18 is a schematic diagram of the decomposition of embodiment (VII) of the present invention.

Figure 19 is a cross-sectional view of embodiment (VII) of the present invention.

The following description contains specific information related to exemplary embodiments of the present invention. The drawings and the detailed descriptions accompanying the present invention are exemplary embodiments only. However, the present invention is not limited to these exemplary embodiments. Other variations and embodiments of the present invention will occur to those skilled in the art. Unless otherwise specified, identical or corresponding elements in the drawings may be indicated by identical or corresponding drawing reference numerals. In addition, the drawings and illustrations in the present invention are generally not drawn to scale and are not intended to correspond to actual relative dimensions.

For the purpose of consistency and ease of understanding, the same features are identified by reference numerals in the exemplary drawings (although in some examples they are not so identified). However, the features in different embodiments may differ in other aspects and should not be narrowly limited to the features shown in the drawings.

The phrases "at least one embodiment", "an embodiment", "multiple embodiments", "different embodiments", "some embodiments", "this embodiment", etc., may indicate that the embodiment of the present invention described herein may include certain features, structures, or characteristics, but not every possible embodiment of the present invention must include certain features, structures, or characteristics. In addition, repeated use of the phrases "in one embodiment", "in this embodiment" does not necessarily refer to the same embodiment, although they may be the same. In addition, phrases such as "embodiment" used in connection with "the present invention" do not mean that all embodiments of the present invention must include certain features, structures, or characteristics, and should be understood as "at least some embodiments of the present invention" include the said certain features, structures, or characteristics. The term "coupled" is defined as connected, whether directly or indirectly through intermediate elements, and is not necessarily limited to physical connections. When the term "includes" is used, it means "including but not limited to", which explicitly points out the open inclusion or relationship of the described combinations, groups, series and equivalents.

In addition, for purposes of explanation and not limitation, specific details such as functional entities, techniques, protocols, standards, etc. are described to provide an understanding of the described technology. In other examples, detailed descriptions of well-known methods, techniques, systems, architectures, etc. are omitted to avoid confusing the description with unnecessary details.

The terms "first", "second" and "third" in the specification of the present invention and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the term "including" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or modules is not limited to the listed steps or modules, but optionally also includes unlisted steps or modules, or optionally also includes other steps or modules inherent to these processes, methods, products or devices.

The present invention is described in further detail below with reference to the accompanying drawings.

Referring to FIG. 1 , the present invention provides a shock-absorbing wheel 10, which is mainly composed of a first rim 101, a first elastic layer 102, a second rim 103 and a second elastic layer 104, wherein the first elastic layer 102 is coated on the outside of the first rim 101, the second rim 103 is coated on the outside of the first elastic layer 102, and the second elastic layer 104 is coated on the outside of the second rim 103. The first rim 101 and the second rim 103 are made of metal or plastic material, and the first elastic layer 102 and the second elastic layer 104 are made of elastic material. As can be seen from this figure, the first rim 101, the first elastic layer 102, the second rim 103 and the second elastic layer 104 are sequentially matched with each other to complete the set, so that the shock-absorbing wheel 10 body has a multi-layer structure to achieve a shock-absorbing effect.

Referring to FIG. 2 , the first rim 101 of the shock absorbing wheel 10 is formed with an axle hole 1011, and the axle hole 1011 can be used for an external axle rod assembly. The outer surface of the first rim 101 is formed with a first assembly surface 1012, and the inner surface of the first elastic layer 102 is formed with a first opposite assembly surface 1021, and the outer surface is formed with a second assembly surface 1022. The first elastic layer 102 is combined with the first assembly surface 1012 by the first opposite assembly surface 1021, so that the first elastic layer 102 is sleeved on the outside of the first rim 101, and the inner surface of the second rim 103 is formed with a second assembly surface 1022. There is a second relative assembly surface 1031, and a third assembly surface 1032 is formed on the outer surface. The second rim 103 is combined with the second assembly surface 1022 by the second relative assembly surface 1031, so that the second rim 103 is sleeved on the outside of the first elastic layer 102. In addition, a third relative assembly surface 1041 is formed on the inner surface of the second elastic layer 104. The second elastic layer 104 is combined with the third relative assembly surface 1041 and the third assembly surface 1032, so that the second elastic layer 104 is sleeved on the outside of the second rim 103. The state of the above components after assembly is shown in Figure 1.

Please refer to Figure 3, and further refer to Figure 2. The shock-absorbing wheel 10 of the present invention mainly achieves the shock-absorbing effect through a multi-layer structure. The shock-absorbing wheel 10 can use the second elastic layer 104 as a tire of a transport device to travel on the surface of any object, or as a guide wheel of a conveyor track. As can be seen from this figure, when the second elastic layer 104 is subjected to an external reaction force, it will absorb or disperse it through the elastic characteristics of the second elastic layer 104 itself, and the reaction force that cannot be absorbed or dispersed can be transmitted to the first elastic layer 102 through the second wheel rim 103 for absorption or dispersion again, so that the shock-absorbing wheel 10 of the present invention achieves the shock-absorbing effect through a multi-layer structure.

Please refer to Figures 4 and 5. In one embodiment, a rectangular groove 11 is formed on the first assembly surface 1012 surrounding the first rim 101, and a rectangular convex block 12 that can match the rectangular groove 11 is formed on the first opposite assembly surface 1021 surrounding the first elastic layer 102. Through the cooperation between the rectangular convex block 12 and the rectangular groove 11, the shock absorption effect can be effectively improved.

Please refer to Figures 6 and 7. In one embodiment, a first rectangular groove 13 is formed on the first assembly surface 1012 surrounding the first wheel rim 101, a second rectangular groove 14 is formed on the second opposite assembly surface 1031 surrounding the second wheel rim 103, and a first rectangular convex block 15 and a second rectangular convex block 16 are formed on the first opposite assembly surface 1021 and the second assembly surface 1022 surrounding the first elastic layer 102, respectively, relative to the first rectangular groove 13 and the second rectangular groove 14. The first rectangular convex block 15 and the second rectangular convex block 16 cooperate with the first rectangular groove 13 and the second rectangular groove 14, respectively, to effectively enhance the shock absorption effect.

Please refer to Figures 8 and 9. In one embodiment, a rectangular convex block 12 is formed on the second assembly surface 1022 surrounding the first elastic layer 102, and a rectangular groove 11 that can match the rectangular convex block 12 is formed on the second opposite assembly surface 1031 surrounding the second rim 103. Through the cooperation between the rectangular convex block 12 and the rectangular groove 11, the shock absorption effect can be effectively improved.

Please refer to Figures 10 and 11. In one embodiment, the first assembly surface 1012 surrounding the first wheel rim 101 is formed with a first arc-shaped groove 21, the second opposite assembly surface 1031 surrounding the second wheel rim 103 is formed with a second arc-shaped groove 22, and the first opposite assembly surface 1021 and the second assembly surface 1022 surrounding the first elastic layer 102 are respectively formed with a first arc-shaped convex block 23 and a second arc-shaped convex block 24 opposite to the first arc-shaped groove 21 and the second arc-shaped groove 22. The first arc-shaped groove 21 and the second arc-shaped groove 22 cooperate with the first arc-shaped convex block 23 and the second arc-shaped convex block 24, respectively, to effectively enhance the shock absorption effect.

Please refer to Figures 12 and 13. In one embodiment, the first arc-shaped groove 21, the second arc-shaped groove 22, the first arc-shaped protrusion 23 and the second arc-shaped protrusion 24 are biased toward one side surface 105 of the shock-absorbing wheel 10, which can effectively enhance the shock-absorbing effect.

Referring to FIGS. 14 to 16 , the present invention provides another shock absorbing wheel 30, the shock absorbing wheel 30 comprising: a first wheel rim 301, formed with an axle hole 3011, the outer surface of the first wheel rim 301 is formed with a first assembly surface 3012, the first assembly surface 3012 is formed with a first rectangular groove 3013; a first elastic layer 302, the inner surface is formed with a first opposite assembly surface 3021, the outer surface is formed with a second assembly surface 3022, the first opposite assembly surface 3021 is formed with a first rectangular convex groove 3013; The first elastic layer 302 is combined with the first rectangular protrusion 3023 and the first rectangular groove 3013, so that the first elastic layer 302 is sleeved on the outside of the first rim 301; a second rim 303 is formed with a second opposite assembly surface 3031 on the inner surface and a third assembly surface 3032 on the outer surface, and the second rim 303 is combined with the second opposite assembly surface 3031 and the second assembly surface 3022, so that the second rim 303 is sleeved on the outside of the first elastic layer 302; a second elastic The elastic layer 304 has a third opposite assembly surface 3041 formed on the inner surface and a fourth assembly surface 3042 formed on the outer surface. The fourth assembly surface 3042 has a second rectangular protrusion 3043 formed thereon. The second elastic layer 304 is combined with the third assembly surface 3041 and the third assembly surface 3032 so that the second elastic layer 304 is sleeved on the outside of the second rim 303. A third rim 305 has a fourth opposite assembly surface 3051 formed on the inner surface and a fifth assembly surface 3052 formed on the outer surface. The fourth relative assembly surface 3051 is formed with a second rectangular groove 3053, and the third wheel rim 305 is combined with the second rectangular protrusion 3043 by the second rectangular groove 3053, so that the third wheel rim 305 is sleeved on the outside of the second elastic layer 304; a third elastic layer 306, a fifth relative assembly surface 3061 is formed on the inner surface, and the third elastic layer 306 is combined with the fifth assembly surface 3052 by the fifth relative assembly surface 3061, so that the third elastic layer 306 is sleeved on the outside of the third wheel rim 305.

The shock-absorbing wheel 30 mainly achieves the shock-absorbing effect by means of a multi-layer structure. The shock-absorbing wheel 30 can use the third elastic layer 306 as a tire of a transport device to travel on the surface of any object, or as a guide wheel of a conveyor track. As shown in FIG. 16 , when the third elastic layer 306 is subjected to an external reaction force, the third elastic layer 306 will absorb or disperse the reaction force by means of the elastic properties of the third elastic layer 306 itself. If the reaction force cannot be absorbed or dispersed, it can be transmitted to the second elastic layer 304 through the third wheel 305 for absorption or dispersion again. Moreover, if the second elastic layer 304 cannot absorb or disperse the reaction force, it can be transmitted to the first elastic layer 302 through the second wheel 303 for absorption or dispersion again. Thus, the shock-absorbing wheel 10 of the present invention can achieve the shock-absorbing effect through the multi-layer structure.

Please refer to Figure 17. The present invention also provides a shock-absorbing wheel 40, which is mainly composed of a first rim 401, an elastic layer 402 and a second rim 403, wherein the elastic layer 402 is coated on the outside of the first rim 401, and the second rim 403 is coated on the outside of the elastic layer 402. The first rim 401 and the second rim 403 are made of metal or plastic materials, and the elastic layer 402 is made of elastic material. As can be seen from this figure, the first rim 401, the elastic layer 402 and the second rim 403 are sequentially matched with each other to complete the sleeve arrangement, so that the shock-absorbing wheel 40 body has a multi-layer structure to achieve a shock-absorbing effect.

Referring to FIG. 18 , the first wheel rim 401 of the shock absorbing wheel 40 is formed with an axle hole 4011, and the axle hole 4011 can be used for an external axle rod assembly. The outer surface of the first wheel rim 401 is formed with a first assembly surface 4012, and the inner surface of the elastic layer 402 is formed with a first opposite assembly surface 4021, and the outer surface is formed with a second assembly surface 4022. The elastic layer 402 is formed with the first opposite assembly surface 4021. 1 is combined with the first assembly surface 4012, so that the elastic layer 402 is sleeved on the outside of the first rim 401, and the inner surface of the second rim 403 is formed with a second opposite assembly surface 4031. The second rim 403 is combined with the second assembly surface 4022 by the second opposite assembly surface 4031, so that the second rim 403 is sleeved on the outside of the elastic layer 402, and the state of the above-mentioned components after the assembly is completed is shown in Figure 17.

Please refer to Figure 19, and further refer to Figure 18. The shock-absorbing wheel 40 mainly achieves the shock-absorbing effect through a multi-layer structure. The shock-absorbing wheel 40 can use the second wheel rim 403 as a tire of a transport device to travel on the surface of any object, or as a guide wheel of a conveyor track. As can be seen from this figure, when the second wheel rim 403 is subjected to an external reaction force, the elastic properties of the elastic layer 402 itself will absorb or disperse it, so that the shock-absorbing wheel 40 achieves the shock-absorbing effect through a multi-layer structure.

Based on the above description, it is apparent that various techniques may be used to implement the concepts described in this application without departing from the scope of these concepts. Furthermore, while the concepts have been described with specific reference to certain implementations, a person of ordinary skill in the art will recognize that changes may be made in form and detail without departing from the scope of these concepts. As such, the described implementations are to be considered in all respects as illustrative and not restrictive. Furthermore, it should be understood that this application is not limited to the specific implementations described above, but rather is susceptible to many rearrangements, modifications, and substitutions without departing from the scope of the invention.

10: shock-absorbing wheel

101: First lap

1011: shaft hole

102: First elastic layer

103: Second round

104: Second elastic layer

Claims (4)

A shock-absorbing wheel comprises: a first wheel rim, formed with an axle hole, a first assembly surface formed on the outer surface of the first wheel rim, and a first rectangular groove formed around the first assembly surface of the first wheel rim; a first elastic layer, formed with a first opposite assembly surface on the inner surface, and a second assembly surface formed on the outer surface, the first elastic layer is combined with the first assembly surface by the first opposite assembly surface, so that the first elastic layer is sleeved on the outside of the first wheel rim; a second wheel rim, formed with a second opposite assembly surface on the inner surface, and a second rectangular groove formed around the second opposite assembly surface of the second wheel rim, and a third assembly surface formed on the outer surface of the second wheel rim. The second rim is combined with the second assembly surface by the second relative assembly surface, so that the second rim is sleeved outside the first elastic layer; wherein the first relative assembly surface and the second assembly surface surrounding the first elastic layer are respectively formed with a first rectangular convex block and a second rectangular convex block opposite to the first rectangular groove and the second rectangular groove, the first rectangular convex block is matched with the first rectangular groove, and the second rectangular convex block is matched with the second rectangular groove; and a second elastic layer, the inner surface of which is formed with a third relative assembly surface, the second elastic layer is combined with the third relative assembly surface, so that the second elastic layer is sleeved outside the second rim. The shock-absorbing wheel as described in claim 1, wherein the first assembly surface surrounding the first wheel rim is formed with a first arc-shaped groove, the second opposite assembly surface surrounding the second wheel rim is formed with a second arc-shaped groove, and the first opposite assembly surface and the second assembly surface surrounding the first elastic layer are respectively formed with a first arc-shaped convex block and a second arc-shaped convex block opposite to the first arc-shaped groove and the second arc-shaped groove. A shock-absorbing wheel as described in claim 5, wherein the first arc-shaped groove, the second arc-shaped groove, the first arc-shaped protrusion and the second arc-shaped protrusion are biased toward one side of the shock-absorbing wheel. A wheel body for a shock-absorbing wheel includes: a first wheel rim, formed with an axle hole, a first assembly surface formed on the outer surface of the first wheel rim, and a first rectangular groove formed on the first assembly surface; a first elastic layer, formed with a first opposite assembly surface on the inner surface, and a second assembly surface formed on the outer surface, and a first rectangular convex block formed on the first opposite assembly surface, and the first elastic layer is combined with the first rectangular groove by the first rectangular convex block, so that the first elastic layer is sleeved on the outside of the first wheel rim; a second wheel rim, formed with a second opposite assembly surface on the inner surface, and a third assembly surface formed on the outer surface, and the second wheel rim is combined with the second opposite assembly surface and the second assembly surface, so that the second wheel rim is sleeved on the outside of the first elastic layer; a second elastic layer, formed with a first opposite assembly surface on the inner surface, and a second rectangular convex block on the outer surface, and the second opposite assembly surface is combined with the second assembly surface, so that the second wheel rim is sleeved on the outside of the first elastic layer; A third rim is formed with a third opposing assembly surface, a fourth assembly surface is formed on the outer surface, a second rectangular convex block is formed on the fourth assembly surface, the second elastic layer is combined with the third assembly surface by the third opposing assembly surface, so that the second elastic layer is sleeved on the outside of the second rim; a third rim is formed with a fourth opposing assembly surface on the inner surface, a fifth assembly surface is formed on the outer surface, the fourth opposing assembly surface is formed with a second rectangular groove, the third rim is combined with the second rectangular convex block by the second rectangular groove, so that the third rim is sleeved on the outside of the second elastic layer; and a third elastic layer is formed with a fifth opposing assembly surface on the inner surface, the third elastic layer is combined with the fifth assembly surface by the fifth opposing assembly surface, so that the third elastic layer is sleeved on the outside of the third rim.

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