Sole cushioning structure and sole

Abstract

A sole cushioning structure and a sole. The sole cushioning structure is provided with an air cushion layer (30) sealed by an upper covering layer (10) and a lower covering layer (20), wherein the air cushion layer (30) comprises transversely stacked and arranged bubble units (31), the bubble units (31) are rotary bodies, and peripheral sides thereof are enclosed by side walls to form closed air chambers (32); and several arc sections (311) are formed on a side wall of each bubble unit (31) from top to bottom, some of the arc sections (311) obliquely extending outwards from top to bottom, some of the arc sections (311) obliquely extending inwards from top to bottom, and the vertically adjacent arc sections (311) extending in opposite directions.

Description

Sole cushioning structure and sole Cross-references

[0001] This application is based on the CN application number 2023115417064, filed on November 17, 2023, the CN application number 2023115370231, filed on November 17, 2023, and the CN application number 2023115417308, filed on November 17, 2023, and claims priority to the above three applications. The disclosed contents of the above three CN applications are hereby introduced as a whole into this application. Technical Field

[0002] The present invention relates to the technical field of sole materials, in particular to a sole shock absorbing structure and a sole. Background Art

[0003] With the development of society and the continuous improvement of people's material living standards, more and more people pay attention to their health and participate in more sports and fitness in their daily lives. During sports such as running, due to inertia, the moment the sole of the athlete's shoe touches the ground, the sole is subjected to downward pressure from the body's own weight and a counter-impact force (generally equivalent to 3 to 5 times the body weight) exerted on it by the bottom surface. This impact force can easily cause certain damage to the athlete's knee and / or ankle joints and other human structures. Therefore, shoes are footwear that protect the legs and feet from injury, and the cushioning function of shoes is very important and necessary.

[0004] Many shoes currently on the market with shock-absorbing features rely on improvements to the sole material or structure. For example, they use foamed thermoplastic polyurethane, a material with excellent shock-absorbing properties, and incorporate air cushions and shock-absorbing columns. However, improvements to the sole material require different shock-absorbing properties at different locations on the sole, and soles made of the same material cannot meet these requirements. Improvements to the sole structure also result in a stiff overall structure and low comfort.

[0005] The following is a summary of the subject matter described in detail herein and is not intended to limit the scope of the claims.

[0006] An embodiment of the present application provides a sole cushioning structure and a sole, wherein the sole cushioning structure is provided with an air cushion layer enclosed by an upper covering layer and a lower covering layer, the air cushion layer includes bubble units stacked and arranged laterally, the bubble units are rotating bodies, and the circumference is surrounded by side walls to form a closed air chamber, the side walls of the bubble units form a plurality of arc segments from top to bottom, some of the arc segments extend obliquely outward from top to bottom, and some of the arc segments extend obliquely inward from top to bottom, and the extension directions of vertically adjacent arc segments are opposite. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0008] FIG1 is a schematic structural diagram of a sole cushioning structure according to an embodiment of the present invention;

[0009] FIG2 is a schematic structural diagram of the sole cushioning structure in FIG1 after removing the overlying layer;

[0010] FIG3 is a vertical cross-sectional view of a bubble unit in the air cushion layer of the sole cushioning structure in FIG1 ;

[0011] FIG4 is a schematic top view of the air cushion layer of the sole cushioning structure in FIG1 after removing the overlying layer;

[0012] FIG5 is a schematic cross-sectional view of the air cushion layer of the sole cushioning structure in FIG1 at the middle position in the vertical direction;

[0013] FIG6 is a vertical cross-sectional view of the bubble unit of the air cushion layer in Example 2 of the sole cushioning structure provided by the present invention;

[0014] FIG7 is a schematic structural diagram of a cross-section of a third embodiment of the sole cushioning structure provided by the present invention at a middle position in the vertical direction;

[0015] FIG8 is a vertical cross-sectional view of a bubble unit in the air cushion layer of the sole cushioning structure in FIG7 ;

[0016] FIG9 is a vertical cross-sectional view of a bubble unit in an air cushion layer of Example 4 of the sole cushioning structure provided by the present invention;

[0017] FIG10 is a vertical cross-sectional view of a bubble unit in an air cushion layer of Example 5 of the sole cushioning structure provided by the present invention;

[0018] FIG11 is a schematic structural diagram of a sixth embodiment of a sole cushioning structure provided by the present invention;

[0019] FIG12 is a vertical cross-sectional schematic diagram of the bubble unit in the air cushion layer of the sole cushioning structure in FIG12 .

[0020] Description of main reference numerals:

[0021] Upper covering layer 10 ; lower covering layer 20 ; air cushion layer 30 ; bubble unit 31 ; arc segment 311 ; straight segment 312 ; support segment 313 ; air chamber 32 ; protrusion 33 ; contraction portion 34 ; partition 35 . DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] In the claims, description and drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" is for the purpose of distinguishing different objects rather than for describing a specific order.

[0024] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise expressly defined, directional words such as the terms "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific scope of protection of the present invention.

[0025] In the claims, description and above-mentioned drawings of the present invention, unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" should be understood in a broad sense, that is, any connection method without displacement relationship and relative rotation relationship between the two parties, that is, including non-detachable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or elements.

[0026] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to". Example 1

[0027] Embodiment 1 of the present invention provides a sole cushioning structure, which can be applied to the sole and used as the midsole of the shoe. This embodiment is described mainly based on the sole cushioning structure.

[0028] 1 , the sole cushioning structure provided in this embodiment includes an upper covering layer 10, a lower covering layer 20 and an air cushion layer 30; wherein the air cushion layer 30 is located between the upper covering layer 10 and the lower covering layer 20, and includes a plurality of bubble units 31 stacked and arranged in a transverse direction; each of the bubble units 31 is a rotating body formed around a vertically extending longitudinal axis, the circumference of which is surrounded by side walls, and the upper and lower ends of which are respectively connected to the upper covering layer 10 and the lower covering layer 20 to form a closed air chamber 32 in the bubble unit 31; the side walls of each of the bubble units 31 form a plurality of arc segments 311 from top to bottom on a vertical section passing through the longitudinal axis; wherein some of the arc segments 311 extend obliquely from top to bottom toward the outside of the bubble unit 31, and some of the arc segments 311 extend obliquely from top to bottom toward the inside of the bubble unit 31, and the extension directions of the vertically adjacent arc segments 311 are opposite.

[0029] Specifically, the upper covering layer 10, lower covering layer 20, and air cushion layer 30 can be formed using 3D printing. The material used can be thermoplastic polyurethane elastomer. Commercially available thermoplastic polyurethane elastomers can be selected, such as Detron 7085AU, Covestro UT7-85AU, and Lubrizol BF-92. Alternatively, nylon can be used, and the material grade can be selected based on actual needs. It should be understood that in this embodiment, when the sole cushioning structure is made of different materials, their cushioning performance will inevitably vary, but this difference will not affect the sole cushioning structure's performance. Furthermore, the materials used for the upper covering layer 10 and lower covering layer 20 can be the same or different, for example, the upper covering layer 10 can be made of a more elastic material, while the lower covering layer 20 can be made of a harder material. Furthermore, the material used for the air cushion layer 30 can also be different from that of the upper covering layer 10 and lower covering layer 20, without affecting the sole cushioning structure's performance.

[0030] However, it should be noted that the upper covering layer 10 and the lower covering layer 20 should be made of airtight materials. When they cover the upper and lower parts of the air cushion layer 30 , they can cooperate with the air cushion layer 30 to form a sealed air chamber 32 .

[0031] Specifically, referring to Figure 2 , the air cushion layer 30 comprises a plurality of air bubble units 31 stacked and arranged in a transverse direction. The transverse direction herein refers to the plane containing the first and second directions. In this embodiment, the sole cushioning structure can be considered a rectangular block. When this rectangular block is located on a horizontal plane, it has vertical and transverse directions. The vertical direction is the vertical direction, and the transverse direction is the horizontal direction, which is the plane containing the first and second directions in Figure 2 . Here, the first and second directions are perpendicular.

[0032] Referring to Figure 3 , each bubble cell 31 is a body of revolution formed around a vertically extending longitudinal axis, surrounded by sidewalls. Its upper and lower sections are respectively docked with the upper cladding layer 10 and the lower cladding layer 20 to form a sealed air chamber 32 within the bubble cell 31. Figure 3 is a vertical cross-sectional schematic diagram of a bubble cell 31 in this embodiment. In this bubble cell 31, the double-arrowed straight line represents its longitudinal axis. It can be seen that the bubble cell 31 is formed by being surrounded by sidewalls, and its sidewalls rotate around the longitudinal axis, forming a body of revolution. The sidewalls here have a certain thickness, but the interior of the bubble cell 31 is hollow to store air. The thickness of the sidewalls affects the vertical deformation capacity of the bubble cell 31 and can be adjusted according to actual conditions. At the same time, the upper and lower ends of each bubble cell 31 are respectively docked with the upper cladding layer 10 and the lower cladding layer 20, thereby forming a sealed air chamber 32. When the sole cushioning structure is subjected to pressure, the volume of the air chamber 32 is reduced, and the air inside is compressed to store energy.

[0033] 3 , the sidewall of each bubble cell 31 forms a plurality of arc segments 311 from top to bottom in a vertical cross-section passing through the longitudinal axis of the bubble cell 31. Some of the arc segments 311 extend obliquely from top to bottom toward the outside of the bubble cell 31, while others extend obliquely from top to bottom toward the inside of the bubble cell 31. Vertically adjacent arc segments 311 extend in opposite directions. In this embodiment, vertically adjacent arc segments 311 in each bubble cell 31 connect with each other, and the connecting portion smoothly transitions. Thus, the sidewall of the bubble cell 31 is formed with a protrusion 33 and a contraction 34, and the protrusion 33 and contraction 34 are vertically adjacent.

[0034] When the sole cushioning structure is subjected to pressure from top to bottom, the protrusion 33 of the bubble unit 31 will bulge outward further, while the contraction portion 34 will contract inward further, thereby increasing the vertical deformation capacity of the bubble unit 31 and increasing the degree of compression of the air in the air chamber 32. At the same time, when the above-mentioned pressure is gradually removed, the protrusion 33 of the bubble unit 31 will retract inward, while the contraction portion 34 will bulge outward, which makes the bubble unit 31 have better rebound ability. When applied to the sole, through the deformation of the bubble unit 31 and the compression and expansion of the air in the air chamber 32, the sole cushioning structure can absorb energy when under pressure and release energy slowly when decompressed, thereby achieving a better cushioning and rebound effect.

[0035] Referring to FIG2 , in the air cushion layer 30, the bubble cells 31 are densely stacked and arranged in the transverse direction. Specifically, referring to FIG4 and FIG5 , the bubble cells 31 are sequentially arranged in a plurality of rows along a first transverse direction and in a plurality of columns along a second transverse direction. Furthermore, in the first and second directions, at least portions of the outer sidewall surfaces of adjacent bubble cells 31 abut against each other.

[0036] Referring to Figures 4 and 5, there are shown the arrangement of the various bubble units 31 under two different cross sections and the sizes of the bubble units 31 at different positions. It can be seen that the sizes of the same bubble unit 31 are different under cross sections at different height positions. This is because, as mentioned above, the bubble unit 31 has a protrusion 33 and a contraction 34. At the same time, taking the bubble unit 31 located in the middle position as an example, there are two adjacent bubble units 31 in the first direction, and these two bubble units 31 are in contact with the bubble unit 31. There are also two adjacent bubble units 31 in the second direction, and these two bubble units 31 are also in contact with the bubble unit 31. Through this close-fitting arrangement, when the sole cushioning structure is under pressure, adjacent bubble units 31 can support each other, thereby improving the supporting performance of the sole cushioning structure.

[0037] Furthermore, in the air cushion layer 30, the outer wall surface of the side wall of each bubble cell 31 and the intersection of a vertical cross-section passing through the longitudinal axis of the bubble cell 31 and parallel to the first direction, and the corresponding portion of the outer wall surface of the side wall of another bubble cell 31 adjacent to the bubble cell 31 in the first direction, are in close contact with each other at any position from top to bottom. In the air cushion layer 30, the outer wall surface of the side wall of each bubble cell 31 and the intersection of a vertical cross-section passing through the longitudinal axis of the bubble cell 31 and parallel to the second direction, and the corresponding portion of the outer wall surface of the side wall of another bubble cell 31 adjacent to the bubble cell 31 in the second direction, are in close contact with each other at any position from top to bottom.

[0038] Specifically, referring to Figure 1, the positions of the protrusion 33 and the contraction portion 34 between one bubble unit 31 and other adjacent bubble units 31 are staggered, which enables each bubble unit 31 to fit tightly together with other adjacent bubble units 31, thereby achieving better support and rebound effects.

[0039] In addition, it should be understood that by adjusting the curvature of the arc segment 311, the cushioning performance of the sole cushioning structure can also be adjusted, and this adjustment can be performed according to actual needs.

[0040] In the sole cushioning structure provided by this embodiment, an upper covering layer 10, a lower covering layer 20 and an air cushion layer 30 are provided. The air cushion layer 30 includes a plurality of bubble units 31 stacked and arranged in the transverse direction. The upper and lower ends of each bubble unit 31 are connected to the upper covering layer 10 and the lower covering layer 20, thereby forming a closed air chamber 32 inside each bubble unit 31. When the upper covering layer 10 is subjected to downward pressure, each bubble unit 31 will be squeezed, so that the air in the air chamber 32 of each bubble unit 31 will be compressed. When the pressure is removed, the air will return to its original volume. In this process, the bubble unit 31 first acts as a cushioning device, and the air in the air chamber 32 of each bubble unit 31 is compressed. To a more moderate support effect, the bubble unit 31 then recovers from the squeezed state and plays a rebound role, thereby playing a shock-absorbing role in combination with the whole; and the side wall of each bubble unit 31 is composed of a number of arc segments 311 arranged along the up and down directions. This structure will provide a greater deformation ability in the part where the arc segment 311 expands outward and contracts inward, so that the bubble unit 31 can have a larger deformation space, which can not only reduce the overall hardness of the shock-absorbing structure and provide a softer support effect, but also provide a greater rebound when the bubble unit 31 recovers its deformation, and the overall shock-absorbing effect is better. Example 2

[0041] The difference between Example 2 and Example 1 lies in the different design of the shape of the bubble cells 31 .

[0042] In the air cushion layer 30, there are side walls of some bubble units 31, and on the vertical section passing through its longitudinal axis, there is at least one straight support segment 313. The support segment 313 is located between the two vertically adjacent arc segments 311 and has a smooth transition to the connecting part between the two arc segments 311.

[0043] Specifically, referring to FIG6 , the sidewall of the bubble cell 31 includes an arc segment 311 and a support segment 313. The arrangement of the arc segment 311 is the same as in Example 1, and the support segment 313 is a vertically extending structure. The support segment 313 of the bubble cell 31 has a relatively poor deformability. Connecting the support segment 313 between adjacent arc segments 311 can adjust the support and resilience of the bubble cell 31. For example, when the number and length of the support segments 313 are increased, the support performance is improved, but the resilience performance is reduced. When the number and length of the support segments 313 are reduced, the support performance is reduced, but the resilience performance is improved. Example 3

[0044] The difference between Example 2 and Example 1 is that the structure of the air cushion layer 30 is different.

[0045] 7 , the sole cushioning member provided in this embodiment includes an upper covering layer 10, a lower covering layer 20, and an air cushion layer 30. The air cushion layer 30 is located between the upper covering layer 10 and the lower covering layer 20 and includes a plurality of bubble cells 31 stacked and arranged in a transverse direction. Each bubble cell 31 is a body of revolution formed around a vertically extending longitudinal axis, surrounded by side walls, and with its upper and lower ends respectively connected to the upper covering layer 10 and the lower covering layer 20 to form a sealed air chamber 32 within the bubble cell 31. At least one partition 35 is provided inside the bubble cell 31, which divides the air chamber 32 vertically. The side wall of each bubble cell 31 forms a plurality of arc segments 311 from top to bottom on a vertical cross-section passing through its longitudinal axis. Some of the arc segments 311 extend obliquely from top to bottom toward the outside of the bubble cell 31, while some of the arc segments 311 extend obliquely from top to bottom toward the inside of the bubble cell 31, and vertically adjacent arc segments 311 extend in opposite directions.

[0046] Referring to Figure 8, in this embodiment, a partition 35 is provided inside the bubble unit 31. The partition 35 is located in the middle of the bubble unit 31 in the vertical direction, which just separates the bubble unit 31 into two closed chambers distributed above and below. The two closed chambers are not connected to each other. When the sole cushioning component is compressed, the air in the upper and lower closed chambers will be compressed separately. However, it should be understood that the degree of compression of the air in the upper closed chamber is greater than that in the lower closed chamber, which makes the two different in support performance and rebound performance. This difference can improve the overall support performance of the sole cushioning component without affecting its rebound performance, and can also better absorb impact energy and disperse the impact energy into each closed chamber.

[0047] When the sole shock-absorbing component is subjected to pressure from top to bottom, the protrusion 33 of the bubble unit 31 will bulge outward further, while the contraction portion 34 will contract inward further, thereby increasing the vertical deformation capacity of the bubble unit 31 and increasing the degree of compression of the air in the air chamber 32. At the same time, when the above-mentioned pressure is gradually removed, the protrusion 33 of the bubble unit 31 will retract inward, while the contraction portion 34 will bulge outward, which makes the bubble unit 31 have better rebound ability. When applied to the sole, through the deformation of the bubble unit 31 and the compression and expansion of the air in the air chamber 32, the sole shock-absorbing component can absorb energy when under pressure and release energy slowly when decompressed, thereby achieving a better shock-absorbing and rebound effect. Example 4

[0048] 9 , the difference between Example 4 and Example 3 is that the number of partitions 35 in the bubble unit 31 is different. In this embodiment, the number of partitions 35 in the bubble unit 31 is two, and the two partitions 35 vertically divide the air chamber 32 of the bubble unit 31 into three closed chambers of roughly equal size. Example 5

[0049] 10 , the difference between Example 5 and Example 3 is that the number of partitions 35 in the bubble unit 31 is different. In this embodiment, the number of partitions 35 in the bubble unit 31 is three, and the three partitions 35 vertically divide the air chamber 32 of the bubble unit 31 into four closed chambers of roughly equal size. Example 6

[0050] The difference between Example 6 and Example 1 is that the structure of the air cushion layer 30 is different.

[0051] 11 and 12 , a straight line segment 312 is formed below all the arc segments 311. The lower end of the straight line segment 312 is connected to the lower covering layer 20, and the upper end is connected to the lower end of the arc segment 311 located at the bottom. Specifically, referring to FIG2 , the side wall of the bubble unit 31 includes an arc segment 311 and a straight line segment 312. The arrangement of the arc segment 311 is the same as in Example 1, and the straight line segment 312 is a vertically extending structure. The straight line segment 312 of the bubble unit 31 has a poor deformability. However, when the straight line segment 312 is arranged at a lower position, the poor deformability of the straight line segment 312 can be utilized to effectively improve the support of the sole cushioning structure and avoid excessive deformation when under pressure. At the same time, the support performance and rebound performance of the sole cushioning structure can be adjusted by adjusting the length of the straight line segment 312. For example, when the length of the straight segment 312 increases, its supporting performance is better, but the rebound performance is reduced, and when the length of the straight segment 312 decreases, its supporting performance is reduced, but the rebound performance is better.

[0052] In addition, in order to further illustrate the effects of the embodiments provided by the present invention, the present specification provides a pair of ratios.

[0053] Comparative Example 1

[0054] Examples 1 to 6 were all prepared using DeChuang 7085AU brand polyurethane material.

[0055] Comparative Example 1 uses DeChuang 7085AU brand polyurethane material and is injection-molded through a sole mold. Its interior is solid and its shape is the same as that of Example 1.

[0056] Example 1, Example 2, Example 3 and Comparative Example 1 were tested, and the test results are as follows:

[0057] The above test results show that, compared with the comparative example, the cushioning effects of Examples 1 to 6 provided by the present invention are all improved to varying degrees. Furthermore, Examples 4, 5, and 6 show that the greater the number of interlayers 35 within the bubble unit 31, the better. Excessive interlayers 35 can actually reduce the cushioning effect.

[0058] The above description and embodiments are intended to explain the scope of protection of the present invention, but do not constitute a limitation thereto. Modifications, equivalent substitutions, or other improvements to the embodiments of the present invention or portions thereof that can be obtained by a person of ordinary skill in the art through logical analysis, reasoning, or limited experimentation based on the teachings of the present invention or the above embodiments, combined with common knowledge, ordinary technical knowledge in the field, and / or prior art, should all be included within the scope of protection of the present invention.

Claims

1. A sole cushioning structure, characterized in that: include: Overlying layer (10); Lower covering layer (20); and An air cushion layer (30), which is located between the upper covering layer (10) and the lower covering layer (20), and comprises a plurality of air bubble units (31) stacked and arranged in a transverse direction; Each of the bubble units (31) is a rotating body formed around a longitudinal axis extending vertically, its circumference is surrounded by side walls, and its upper and lower ends are respectively connected to the upper covering layer (10) and the lower covering layer (20) to form a closed air chamber (32) in the bubble unit (31); The side wall of each of the bubble units (31) forms a plurality of arc segments (311) from top to bottom in a vertical cross section passing through the longitudinal axis thereof; wherein some of the arc segments (311) extend obliquely from top to bottom toward the outside of the bubble unit (31), and some of the arc segments (311) extend obliquely from top to bottom toward the inside of the bubble unit (31), and the arc segments (311) adjacent to each other in the vertical direction extend in opposite directions.

2. A sole cushioning structure as claimed in claim 1, characterized in that: At least one partition (35) is provided inside the bubble unit (31), and the partition (35) divides the air chamber (32) in the vertical direction.

3. A sole shock absorbing structure as claimed in claim 1, characterized in that: The side wall of each of the bubble units (31) forms a straight line segment (312) below all the arc segments (311) in a vertical section passing through the longitudinal axis thereof, wherein the lower end of the straight line segment (312) is connected to the lower covering layer (20), and the upper end is connected to the lower end of the arc segment (311) located at the bottom.

4. The sole shock absorbing structure according to any one of claims 1 to 3, characterized in that: In each of the bubble units (31), the arc segments (311) adjacent to each other in the vertical direction are connected to each other, and the connection portion has a smooth transition.

5. A sole shock absorbing structure as claimed in claim 4, characterized in that: In the air cushion layer (30), there is a side wall of a portion of the bubble units (31), and in a vertical cross section passing through the longitudinal axis, there is at least one straight support segment (313), the support segment (313) is located between two vertically adjacent arc segments (311), and smoothly transitions to the connecting portion between the two arc segments (311).

6. A sole shock absorbing structure as claimed in claim 5, characterized in that: In the air cushion layer (30), the bubble units (31) are closely stacked and arranged in the transverse direction.

7. A sole cushioning structure as claimed in claim 6, characterized in that: In the air cushion layer (30), the bubble units (31) are sequentially arranged in a plurality of rows along a first transverse direction, and sequentially arranged in a plurality of columns along a second transverse direction, wherein the first direction is perpendicular to the second direction.

8. A sole shock absorbing structure as claimed in claim 7, characterized in that: In the air cushion layer (30), in the first direction and the second direction, the outer wall surfaces of the side walls of adjacent bubble units (31) are in close contact with each other at least partially.

9. A sole cushioning structure as claimed in claim 8, characterized in that: In the air cushion layer (30), the intersection of the outer wall surface of the side wall of each bubble unit (31) and a vertical cross section passing through the longitudinal axis of the bubble unit (31) and parallel to the first direction, and the corresponding part of the outer wall surface of the side wall of another bubble unit (31) adjacent to the bubble unit (31) in the first direction, are in close contact with each other at any position from top to bottom.

10. The sole shock absorbing structure according to claim 9, characterized in that: In the air cushion layer (30), the intersection of the outer wall surface of the side wall of each bubble unit (31) and a vertical cross section passing through the longitudinal axis of the bubble unit (31) and parallel to the second direction, and the corresponding part of the outer wall surface of the side wall of another bubble unit (31) adjacent to the bubble unit (31) in the second direction, are in close contact with each other at any position from top to bottom.

11. A shoe sole, characterized in that: A sole shock absorbing structure as described in any one of claims 1 to 10 is adopted.

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