Inflation-free wheel

Abstract

The utility model discloses an inflation-free wheel which comprises a hub and an annular tire body, a mounting groove is formed in the peripheral wall of the hub, a clamping part clamped in the mounting groove is arranged on the inner side portion of the tire body, and the tire body is provided with an outer side tread and two tire side faces located between the outer side tread and the clamping part. A plurality of damping blind holes are formed in the two tire side faces in the circumferential direction of the tire body at intervals, the cross section of each damping blind hole is provided with at least three straight edges, a corner is formed between any two adjacent straight edges, and the area of the cross section of each damping blind hole is gradually increased from inside to outside. The damping blind holes are formed in the side surface of the tire, so that stones are not easy to clamp. And even if the stones are clamped, a tool can be inserted from the corner to pry out the stones.

Description

Technical Field

[0001] The utility model relates to the technical field of tire manufacturing for electric wheelchairs, in particular to an inflation-free wheel. Background Art

[0002] The tires used in traditional electric wheelchairs include a rubber outer tire and a rubber inner tire. Before use, the inner tire needs to be filled with air from a valve. There are problems such as easy blowouts, easy punctures, and easy air leakage at the valve.

[0003] In order to solve the above problems, some airless tires made of foamed polyurethane have appeared on the market. Some manufacturers design some round or oval holes on the tread of airless tires. These hole designs can improve the elastic buffering performance of the tire and have a certain anti-skid effect. However, this airless tire also has the following problems: since the holes are set on the tread, it is easy for small stones to get stuck. Since the holes are round or oval, it is difficult to insert tools to pry out small stones when they are stuck. If the stones are stuck in them for a long time, it is easy to cause the tread to rupture and reduce the anti-skid performance. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide an air-free wheel, on which holes capable of improving the buffering performance are provided, and it is also convenient to remove stones stuck in these holes.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A non-inflatable wheel comprises a wheel hub and an annular tire body, wherein a mounting groove is arranged on the outer peripheral wall of the wheel hub, and the inner side of the tire body comprises a clamping portion clamped in the mounting groove, and the tire body comprises an outer tread and two tire side surfaces located between the outer tread and the clamping portion, and a plurality of shock-absorbing blind holes are arranged on the two tire side surfaces at intervals along the circumferential direction of the tire body, wherein the cross section of the shock-absorbing blind hole comprises at least three straight edges, and a corner is formed between any two adjacent straight edges, and the cross section area of ​​the shock-absorbing blind hole gradually increases from the inside to the outside.

[0007] In a preferred embodiment of the present invention, a plurality of anti-slip ribs are provided on the inner side wall of the installation groove.

[0008] In a preferred embodiment of the present invention, the anti-slip ribs are all parallel.

[0009] In a preferred solution of the present utility model, the clamping portion is interference-fitted with the inner side wall of the installation groove, and an inner groove is provided at the bottom of the installation groove.

[0010] In a preferred solution of the utility model, all straight sides of the cross section of the shock-absorbing blind hole are located on the sides of the same regular polygon.

[0011] In a preferred embodiment of the present invention, the number of the straight edges is three, five or seven.

[0012] In a preferred embodiment of the present invention, the corner is a transition fillet between two straight edges or a vertex angle formed by the direct intersection of two straight edges.

[0013] In a preferred embodiment of the present invention, annular sand retaining ribs are provided on the peripheries of the two tire sides, and all the shock-absorbing blind holes are located in the areas surrounded by the corresponding sand retaining ribs.

[0014] The beneficial effects of the utility model are:

[0015] First, even if the tire is punctured, it will not burst immediately, thus ensuring the continuity and stability of use. It solves the problem of air leakage and bursting of traditional electric wheelchair tires and increases the service life.

[0016] Second, such wheels have good rebound performance, which improves the driving comfort.

[0017] Third, it is easy to maintain, and users do not need to worry about frequent tire replacement, which reduces the cost of use.

[0018] Fourthly, since the shock-absorbing blind holes are arranged on the side of the tire, the cushioning performance is further improved. Compared with the case where the shock-absorbing holes are arranged on the outer tread, it is not easy for stones to get stuck.

[0019] Fifth, even if a stone is stuck in, since the cross-section of the shock-absorbing blind hole has at least three straight edges and at least three corners, the stone will be attached to the straight edges. Generally, there will be a gap between the inner wall of at least one corner and the stone. A tool can be inserted from the corner with the largest gap to pry the stone out. Setting the cross-section area of ​​the shock-absorbing blind hole to gradually increase from the inside to the outside is more conducive to prying the stone out.

[0020] Sixth, after the clamping part is installed in the installation groove, it will be deformed by the clamping force of the two inner walls of the installation groove. The design of the inner groove allows a part of the clamping part to be squeezed into the inner groove after it is deformed, which can release the internal stress of the clamping part of the tire body to a certain extent, which is beneficial to improving the service life of the tire body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of Example 1 of the utility model;

[0022] Figure 2 It is an exploded view of Embodiment 1 of the present utility model;

[0023] Figure 3 It is a cross-sectional view of the location of the shock-absorbing blind hole;

[0024] Figure 4 yes Figure 1 A magnified view of part A;

[0025] Figure 5 This is a front view of Embodiment 2 of the present utility model;

[0026] Figure 6 It is a cross-sectional view of the tire body in Example 2 of the present utility model. DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0028] It should be noted that all directional indications in the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the descriptions of "preferred", "sub-preferred", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "preferred" or "sub-preferred" may explicitly or implicitly include at least one such feature.

[0029] Example 1

[0030] Reference Figures 1 to 4 The present embodiment provides an inflation-free wheel, comprising a wheel hub 2 and an annular tire body 1, wherein a mounting groove 21 is arranged on the outer peripheral wall of the wheel hub 2, and an inner side portion of the tire body 1 has a clamping portion 19 clamped in the mounting groove 21, and the tire body 1 has an outer tread 11 and two tire side surfaces 13 located between the outer tread 11 and the clamping portion 19, and a plurality of shock-absorbing blind holes 14 are arranged on the two tire side surfaces 13 at intervals along the circumferential direction of the tire body 1, and a cross section of the shock-absorbing blind hole 14 has at least three straight edges 101, and a corner 102 is formed between any two adjacent straight edges 101, and the cross section area of ​​the shock-absorbing blind hole 14 gradually increases from the inside to the outside.

[0031] The tire body is made of foamed TPU material, which is made by a special foaming process and has good elasticity. The TPU foam particles inside are in the shape of popcorn, so it can be called a TPU popcorn filled tire. The density of the TPU popcorn filled tire is only 0.18g / mm 3 , the rebound performance exceeds 70%. The wheel hub 2 is made of high-strength hard plastic, such as PP, PE, PA, PC.

[0032] Such a design has the following advantages: First, even if it is punctured, it will not burst immediately, thus ensuring the continuity and stability of use. Second, since the shock-absorbing blind hole 14 is arranged on the tire side 13, its buffering performance is further improved, and compared with the shock-absorbing hole arranged on the outer tread 11, it is not easy to get stuck with stones. Third, even if a stone is stuck, since the cross section of the shock-absorbing blind hole 14 has at least three straight edges 101 and at least three corners 102, the stone therein will be attached to the straight edges 101, and generally there will be a gap between the inner side wall of at least one corner 102 and the stone, and a tool can be inserted from the corner 102 with the largest gap to pry out the stone. The cross section area of ​​the shock-absorbing blind hole 14 is set to gradually increase from the inside to the outside, which is more conducive to prying out the stone.

[0033] Preferably, all straight edges 101 are located on the side of the same regular polygon. The corner 102 is a transition fillet or a vertex angle formed by the direct intersection of two straight edges 101. In other words, the cross section of the shock-absorbing blind hole 14 can be a regular polygon, or a regular polygon with rounded vertex corners, such as a regular pentagon, a regular hexagon, or a regular pentagon or a regular hexagon with rounded vertex corners.

[0034] As a further optimization of the above scheme, the number of straight edges 101 is three, five or seven. With such a design, each corner 102 is directly opposite to a straight edge 101. When inserting a screwdriver or other tool from the corner 102 to pry out the stone, a component force will be generated to push the stone to the opposite straight edge 101. Since the opposite side is a straight edge 101, the stone will not be stuck. If the number of straight edges 101 is an even number, there will be some problems. Taking a square as an example, since the four corners 102 are opposite to each other, when inserting a tool from one corner 102 to pry out the stone, the stone will be squeezed to the opposite corner 102, which may easily cause the stone to be further stuck by the opposite corner 102.

[0035] In this embodiment, the outer tread 11 has anti-skid patterns, which include a plurality of first grooves 16 spaced apart at the left side of the outer tread 11 and a plurality of second grooves 17 spaced apart at the right side of the outer tread 11. Each first groove 16 is symmetrical to a second groove 17.

[0036] Reference Figure 2 and Figure 4 A plurality of anti-slip ribs 211 are provided on the inner side wall of the mounting groove 21. The anti-slip ribs 211 can prevent the tire body 1 from being separated from the wheel hub 2. Preferably, the anti-slip ribs 211 are all parallel.

[0037] The clamping portion 19 is interference fit with the inner side wall of the mounting groove 21. As a further improvement of the present invention, an inner groove 212 is provided at the bottom of the mounting groove 21. After the clamping portion 19 is installed in the mounting groove 21, it will be deformed by the clamping force of the two inner side walls of the mounting groove 21. The design of the inner groove 212 allows a part of the clamping portion 19 to be squeezed into the inner groove 212 after the deformation of the clamping portion 19, which can release the internal stress of the clamping portion 19 of the tire body 1 to a certain extent, which is beneficial to improving the service life of the tire body 1.

[0038] The utility model is not only applicable to electric wheelchairs, but also to other types of wheelchairs and transportation vehicles, and has wide application prospects.

[0039] Example 2

[0040] Figure 5 and Figure 6 The second embodiment of the utility model is shown. The second embodiment has a similar structure to the first embodiment. The only difference is that in the second embodiment, the outer peripheries of the two tire sides 13 of the tire body 1 are provided with annular sand retaining ribs 18, and all the shock-absorbing blind holes 14 are located in the area surrounded by the corresponding sand retaining ribs 18. When the electric wheelchair using the airless tire is traveling, the outer tread 11 will squeeze the sand and gravel on the road surface, causing the sand and gravel to splash outward. The design of the sand retaining ribs 18 can block a lot of sand and gravel, and prevent the sand and gravel from entering the shock-absorbing blind holes 14.

[0041] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention specification and drawings under the utility model concept, or directly or indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A non-inflatable wheel, characterized in that: The invention comprises a wheel hub (2) and an annular tire body (1), wherein a mounting groove (21) is arranged on the outer peripheral wall of the wheel hub (2), and the inner side of the tire body (1) comprises a clamping portion (19) clamped in the mounting groove (21), and the tire body (1) comprises an outer tread (11) and two tire side surfaces (13) located between the outer tread (11) and the clamping portion (19), and a plurality of shock-absorbing blind holes (14) are arranged at intervals on the two tire side surfaces (13) along the circumferential direction of the tire body (1), and the cross section of the shock-absorbing blind hole (14) comprises at least three straight edges (101), and a corner (102) is formed between any two adjacent straight edges (101), and the cross section area of ​​the shock-absorbing blind hole (14) gradually increases from the inside to the outside.

2. The air-free wheel according to claim 1, characterized in that: A plurality of anti-slip ribs (211) are arranged on the inner side wall of the installation groove (21).

3. The air-free wheel according to claim 2, characterized in that: The anti-slip ribs (211) are all parallel.

4. The air-free wheel according to claim 1, characterized in that: The clamping portion (19) is interference-fitted with the inner side wall of the installation groove (21), and an inner groove (212) is provided at the bottom of the installation groove (21).

5. The air-free wheel according to claim 1, characterized in that: All straight edges (101) of the cross section of the shock-absorbing blind hole (14) are located on the sides of the same regular polygon.

6. The air-free wheel according to claim 5, characterized in that: The number of the straight edges (101) is three, five or seven.

7. The air-free wheel according to claim 1, characterized in that: The corner (102) is a transition fillet between two straight edges (101) or a vertex angle formed by the direct intersection of two straight edges (101).

8. The air-free wheel according to claim 1, characterized in that: Annular sand retaining ribs (18) are arranged on the peripheries of the two tire sides (13), and all the shock-absorbing blind holes (14) are located in the areas surrounded by the corresponding sand retaining ribs (18).

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