A reinforcing member for a shoe sole and a shoe sole, shoe
By designing four support units in the sole of the athletic shoe and adjusting the width and thickness according to the metatarsal position, the problem of decreased wearing comfort caused by the reinforcement components is solved, achieving protection of the metatarsals and improved comfort during exercise.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ANTA (CHINA) CO LTD
- Filing Date
- 2022-11-01
- Publication Date
- 2026-06-16
AI Technical Summary
While reinforcing components in existing athletic shoe soles improve athletic performance, they also reduce user comfort, potentially causing metatarsal discomfort, especially during high-intensity exercise.
Design a reinforcing component comprising four support units, namely the first to the fourth support units, distributed at different metatarsal positions on the sole of the foot, with width and thickness set according to the metatarsal positions, made of carbon fiber, with a curvature of 15° to 20° from the forefoot to the arch, the support units gradually decreasing in size and thickness in the metatarsophalangeal joint area, and are fitted to the midsole and outsole composite.
While ensuring athletic performance, it improves user comfort, reduces pressure on the metatarsal area, increases deformation recovery, and enhances the rolling and assist effect of the sole.
Smart Images
Figure CN115568664B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of shoe sole structure technology, specifically to a reinforcing member for shoe soles and a shoe sole and shoe. Background Technology
[0002] In professional sports fields such as basketball shoes and running shoes, in order to improve or enhance athletic performance, reinforcing components with high structural rigidity and excellent deformation recovery capabilities, such as carbon fiber plates, are incorporated into the soles. However, while these reinforcing components provide assistance to athletes or users, their high structural strength leads to a decrease in user comfort. Furthermore, due to the excessive structural strength of these carbon fiber plates, the deformation of the sole during bending cannot conform well to the flexion of the user's foot, resulting in discomfort at the metatarsal area during high-intensity exercise. Summary of the Invention
[0003] The purpose of this invention is to overcome the aforementioned defects or problems in the prior art and to provide a reinforcing member for the sole, a sole, and a shoe, which can enhance the elasticity of the sole and improve athletic performance while increasing the comfort of the user when wearing the shoe.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A reinforcing member for a shoe sole, the reinforcing member corresponding to the sole of the foot and adapted to extend at least from the forefoot position to the arch position in a posterior-posterior direction, and correspondingly forming a forefoot portion and an arch portion; the forefoot portion is formed by four support units distributed in a lateral direction and extending forward from the arch portion, each support unit being, from the inside out, a first support unit, a second support unit, a third support unit, and a fourth support unit; the first support unit is disposed in the lateral direction between the first and second metatarsal bones of the sole, and its width in the posterior-posterior direction corresponding to the metatarsophalangeal joint region is 10% to 12% of the width of the sole; The second support unit is disposed between the second and third metatarsal bones of the foot in the left-right direction, and its width in the anteroposterior direction corresponding to the metatarsophalangeal joint area is 7.6% to 9.5% of the width of the foot. The third support unit is disposed between the third and fourth metatarsal bones of the foot in the left-right direction, and its width in the anteroposterior direction corresponding to the metatarsophalangeal joint area is 5.7% to 7.5% of the width of the foot. The fourth support unit is disposed between the fourth and fifth metatarsal bones of the foot in the left-right direction, and its width in the anteroposterior direction corresponding to the metatarsophalangeal joint area is 3.8% to 5.5% of the width of the foot.
[0006] Furthermore, the width of each support unit between the rear end of the region corresponding to the metatarsophalangeal joint and the arch of the foot is not less than the width of the support unit in the region corresponding to the metatarsophalangeal joint.
[0007] Furthermore, the width of each support unit between the front end of the region corresponding to the metatarsophalangeal joint and the front end of the support unit is less than or equal to the width of the support unit in the region corresponding to the metatarsophalangeal joint.
[0008] Furthermore, the thickness of each support unit gradually decreases or remains constant from back to front.
[0009] Furthermore, the thickness of the first support unit corresponding to the metatarsophalangeal joint region is 100% to 120% of the standard thickness; the thickness of the second support unit corresponding to the metatarsophalangeal joint region is 80% to 100% of the standard thickness; the thickness of the third support unit corresponding to the metatarsophalangeal joint region is 80% to 100% of the standard thickness; and the thickness of the fourth support unit corresponding to the metatarsophalangeal joint region is 60% to 80% of the standard thickness; the standard thickness is determined according to the material used in the reinforcing member.
[0010] Furthermore, the reinforcing member is made of carbon fiber.
[0011] Furthermore, the standard thickness is 1 mm.
[0012] Furthermore, the curvature from the forefoot to the arch is 15° to 20°.
[0013] Furthermore, the present invention also provides a shoe sole, comprising an outsole, a midsole, and a reinforcing member for the shoe sole as described in any of the preceding claims; the reinforcing member is fitted to the bottom surface of the midsole; the midsole is adapted to be compositely fixed to the outsole to form the shoe sole.
[0014] In addition, the present invention also provides a shoe, including the above-described sole and an upper composited thereon.
[0015] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects:
[0016] 1. The forefoot is formed by four support units, and the positions of the support units are set according to the metatarsal positions. The first support unit not only corresponds to the first metatarsal, but also spans the first and second metatarsals. Therefore, its position is more biased to the outside than that of conventional reinforcing members, thereby reducing the force exerted on the first metatarsal by the reinforcing members when the sole bends. At the same time, the force exerted by the sole can be transmitted to the first support unit through the sole, or the deformation recovery force of the reinforcing members can be received from the first support unit.
[0017] In a typical structure, the majority of the force applied during the bending of the forefoot of the sole corresponds to the position of the first metatarsal bone. In this reinforcing member, the first, second, third, and fourth support units are arranged sequentially, and the ends of the four support units are connected to the arch of the reinforcing member. By separating each support unit, the overall bending stiffness of the forefoot can be reduced only slightly compared to a full-length reinforcing member, while avoiding excessive structural rigidity at the position of the reinforcing member corresponding to the first metatarsal bone, which could lead to damage to the first metatarsal bone during use. In other words, by distributing the force to other support units, the overall structural rigidity of the forefoot of the reinforcing member can meet the usage requirements while effectively improving the protection of the first metatarsal bone and the overall comfort of wearing the shoe.
[0018] In this reinforcing member, the widths of the first, second, third, and fourth support units at the metatarsophalangeal joint decrease sequentially, and the widths at this point correspond to the width of the foot sole size. This width setting can increase the deformation degree of the first support unit under stress without changing the overall bending rigidity of the reinforcing member, thereby increasing the mobility of the corresponding first metatarsal bone and reducing the pressure borne by the first metatarsal bone.
[0019] In addition, the deformation force of the forefoot is transmitted to the arch of the foot, and the arch of the foot has a sufficiently large contact area with the sole. Therefore, when the sole bends, the forefoot can quickly recover its deformation by transmitting the force to the sole and then to the foot, thus making the rolling performance of the sole and the assistance to the user more significant.
[0020] 2. Ensuring that the width of the support unit after the corresponding metatarsophalangeal joint is not less than the width of the corresponding metatarsophalangeal joint area can guarantee that the support unit can effectively transmit force to the arch of the reinforcing member when it is bent under stress. This ensures the stability of the reinforcing member in the sole and improves its support for the sole. It also ensures that the reinforcing member can provide sufficient propulsion for the user when it recovers from deformation.
[0021] 3. Make the width of the part of the support unit before the corresponding metatarsophalangeal joint less than or equal to the width of the corresponding metatarsophalangeal joint area. The support unit can gradually shrink at the front of the sole to adapt to the shape of the sole, and this reduction in width will not affect the function of the support unit.
[0022] 4. The thickness of the support unit can be thinner at the front and thicker at the back, thereby improving the effectiveness of force transmission from the bending deformation area of the metatarsophalangeal joint in the forefoot to the arch. Alternatively, the thickness can be kept consistent, still achieving roughly the same effect.
[0023] 5. Reduce the thickness of each support unit at the metatarsophalangeal joint. The thickness at this point is related to the material used in the reinforcing member. This reduction in thickness allows the support unit closer to the outside to provide less structural strength, while ensuring that the support unit closer to the inside provides greater structural strength. Corresponding to the degree of deformation at the metatarsophalangeal joint of the foot, greater structural strength can provide greater deformation performance, thereby ensuring that the reinforcing member has sufficient functionality.
[0024] 6. The reinforcing component is made of carbon fiber, which has excellent resistance to deformation and high structural strength, effectively ensuring the boosting effect of the reinforcing component on the user's movement.
[0025] 7. The standard thickness is selected as 1mm when the reinforcing components are made of carbon fiber. This standard thickness serves as a reference for the thickness of each support unit, ensuring that the thickness of each support unit is within a reasonable range and avoiding problems such as mismatch in strength changes between support units and inappropriate structural strength of each support unit.
[0026] 8. The flexion from the forefoot to the arch is 15° to 20°, which better conforms to the physiological structure curve of the forefoot. This provides better comfort when not engaging in high-intensity exercise, while ensuring comfort when the sole of the shoe touches the ground during exercise.
[0027] 9. In the sole, the reinforcing component is attached to the bottom surface of the midsole, and the midsole is then bonded to the outsole to achieve the installation of the reinforcing component.
[0028] 10. In the shoe, the aforementioned sole is also combined with the upper to form a complete shoe structure. Attached Figure Description
[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments are briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0030] Figure 1 A partial structural schematic diagram of an embodiment of a shoe sole provided by the present invention;
[0031] Figure 2 for Figure 1 A structural diagram of the reinforcing components;
[0032] Figure 3 A comparative example 1 structural schematic diagram of a shoe sole provided by the present invention;
[0033] Figure 4This is a structural schematic diagram of a shoe sole provided by the present invention, shown in Comparative Example 2.
[0034] Explanation of key figure labels:
[0035] Midsole 10; Reinforcing member 20; Arch section 21; Forefoot section 22; First support unit 31; Second support unit 32; Third support unit 33; Fourth support unit 34. Detailed Implementation
[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0037] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and accompanying drawings of this invention is for distinguishing different objects and not for describing a specific order.
[0038] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this invention, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of this invention.
[0039] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this invention should be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection by other means or components.
[0040] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."
[0041] See Figure 1 and Figure 2 Embodiments of the present invention provide a reinforcing member 20 for a shoe sole, and a corresponding shoe sole and shoe, wherein Figure 1The partial structure of the shoe sole is shown. Figure 2 A side view of the reinforcing member 20 is shown.
[0042] The reinforcing member 20 corresponds to the sole of the foot and is adapted to extend at least from the forefoot position to the arch position in the posterior-posterior direction, and is correspondingly formed with a forefoot portion 22 and an arch portion 21. The forefoot position of the sole here includes the toes on the front side of the sole, and the forefoot portion 22 of the reinforcing member 20 also extends to the position corresponding to the toes on the front side of the sole. In this embodiment, the front end of the reinforcing member 20 covers most of the area of the toes but does not extend beyond them. However, in other embodiments, the front end of the reinforcing member 20 may extend beyond the toes, which does not affect the function of the reinforcing member 20. Furthermore, the reinforcing member 20 may also extend to the position corresponding to the heel of the sole, thus forming a heel portion. Although this situation is not shown in the accompanying drawings, the above description still includes this structure.
[0043] The forefoot portion 22 of the reinforcing member 20 is formed by four support units distributed in the left-right direction and extending forward from the arch portion 21. The support units are, from the inside to the outside, the first support unit 31, the second support unit 32, the third support unit 33 and the fourth support unit 34.
[0044] The aforementioned front-back and left-right directions are based on the orientation of the sole of the foot. The front-back direction is from the toe to the heel, and the left-right direction is from the inner to the outer side of the sole. Here, the inner side of the sole refers to the side closer to the big toe, and the outer side refers to the side closer to the little toe. The aforementioned support units are distributed sequentially from the inside to the outside in the left-right direction. Correspondingly, in this embodiment, since the sole shown in the attached figure is the sole of the right foot, the left side in this specification corresponds to the inner side of the sole, and the right side corresponds to the outer side of the sole.
[0045] The first support unit 31 is disposed between the first and second metatarsal bones of the foot in the left-right direction, and its width in the front-back direction corresponding to the metatarsophalangeal joint area is 10% to 12% of the width of the foot. The second support unit 32 is disposed between the second and third metatarsal bones of the foot in the left-right direction, and its width in the front-back direction corresponding to the metatarsophalangeal joint area is 7.6% to 9.5% of the width of the foot. The third support unit 33 is disposed between the third and fourth metatarsal bones of the foot in the left-right direction, and its width in the front-back direction corresponding to the metatarsophalangeal joint area is 5.7% to 7.5% of the width of the foot. The fourth support unit 34 is disposed between the fourth and fifth metatarsal bones of the foot in the left-right direction, and its width in the front-back direction corresponding to the metatarsophalangeal joint area is 3.8% to 5.5% of the width of the foot.
[0046] It should be noted that the descriptions including "between" such as "corresponding to the first and second metatarsal bones of the foot" do not mean that the support unit is only located in the gap between the two corresponding metatarsal bones. Rather, it means that the support unit can be located only in the gap between the two metatarsal bones, or it can extend to a position overlapping both metatarsal bones. Taking the first support unit 31 as an example, the left edge of the first support unit 31 can be located within the range of the first metatarsal bone, and its right edge can be located within the range of the second metatarsal bone. This situation still satisfies the above description of "set between the first and second metatarsal bones of the foot". It should also be noted that since each support unit is not necessarily a straight-extending structure, but may be set into a corresponding curved structure to meet the curved shape of the foot edge, each support unit may also cross different metatarsal bones in its extension direction. This situation is still within the scope of the above description. Of course, given the width range of each support unit in the metatarsophalangeal joint region provided in this embodiment, it is obvious that some support units will span two adjacent metatarsals.
[0047] Furthermore, the "width corresponding to the metatarsophalangeal joint area" mentioned above refers to the distance between the left and right edges of the part of the support unit corresponding to the metatarsophalangeal joint area of the sole of the foot. The distance between the left and right edges of each support unit in this part does not need to be uniform. That is, it is not required that the left and right edges of this part be parallel or have the same curvature. As long as the equivalent width of this part can meet the above requirements, it is acceptable. The equivalent width here refers to the width that can have the same structural strength. However, for the convenience of manufacturing, this part can be set to be parallel or with the same curvature.
[0048] In a preferred embodiment, the width of each support unit from the rear end of the metatarsophalangeal joint region to the arch 21 is not less than the width of the support unit in the metatarsophalangeal joint region. That is, the width of the support unit extending from the arch 21 to the corresponding metatarsophalangeal joint region is not less than the width of the support unit in the metatarsophalangeal joint region. The width of this part can be larger than the width of the metatarsophalangeal joint region. In other words, the support unit can extend forward from the arch 21 in a way that the width gradually decreases or in a way that the width is uniform, but cannot extend forward in a way that the width increases. If the width of the support unit after the metatarsophalangeal joint region is reduced, it will cause the structural strength of this part to decrease, which will cause the force borne by the support unit in the metatarsophalangeal joint region to be unable to be effectively transmitted to the arch 21.
[0049] Preferably, the width of each support unit from the front end of the area corresponding to the metatarsophalangeal joint to the front end of the support unit is less than or equal to the width of the support unit in the area corresponding to the metatarsophalangeal joint. In other words, the width of the front end of the support unit can gradually decrease, thereby better adapting to the shape of the narrowing front side of the sole without affecting the functionality of the support unit. Of course, this width reduction is only a preferred embodiment; if not limited by the shape of the sole, the width of the front end of the support unit can also be increased.
[0050] The thickness of each support unit gradually decreases or remains constant from back to front. Specifically, the thickness of the first support unit 31 corresponding to the metatarsophalangeal joint region is 100% to 120% of the standard thickness; the thickness of the second support unit 32 corresponding to the metatarsophalangeal joint region is 80% to 100% of the standard thickness; the thickness of the third support unit 33 corresponding to the metatarsophalangeal joint region is 80% to 100% of the standard thickness; and the thickness of the fourth support unit 34 corresponding to the metatarsophalangeal joint region is 60% to 80% of the standard thickness. The standard thickness here is determined according to the material used for the reinforcing member 20.
[0051] For example, the reinforcing member 20 used in this embodiment is made of carbon fiber, i.e., a conventional carbon plate. The standard thickness here can be set to 1 mm. If other materials are used, such as TPU, the corresponding standard thickness also needs to be adjusted to meet the relevant structural strength requirements.
[0052] Furthermore, the curvature of the forefoot portion 22 to the arch portion 21 of the reinforcing member 20 is set to 15° to 20° to accommodate the bending at the metatarsal bone of the foot. In this embodiment, 20° is selected.
[0053] Taking a size 43 shoe sole as an example, the corresponding foot width is 10.5cm. Accordingly, the width of the first support unit 31 in the corresponding metatarsophalangeal joint area can be set to 1.05cm to 1.26cm, and the thickness can be set to 1.0mm to 1.2mm; the width of the second support unit 32 in the corresponding metatarsophalangeal joint area can be set to 0.80cm to 1.00cm, and the thickness can be set to 0.8mm to 1.0mm; the width of the third support unit 33 in the corresponding metatarsophalangeal joint area can be set to 0.60cm to 0.79cm, and the thickness can be set to 0.8mm to 1.0mm; the width of the fourth support unit 34 in the corresponding metatarsophalangeal joint area can be set to 0.40cm to 0.58cm, and the thickness can be set to 0.6mm to 0.8mm.
[0054] Specifically, the data used in this embodiment are as follows: the first support unit 31 has a width of 1.1cm and a thickness of 1.1mm; the second support unit 32 has a width of 0.85cm and a thickness of 0.9mm; the third support unit 33 has a width of 0.7cm and a thickness of 0.8mm; and the fourth support unit 34 has a width of 0.5cm and a thickness of 0.7mm.
[0055] In addition, to illustrate the structural improvement effect of the reinforcing member 20, two comparative examples are provided, respectively referring to... Figure 3 and Figure 4 , Figure 3 For comparative example 1, the supporting unit of the reinforcing member 20 is two, with roughly the same width, both covering most of the forefoot area. Figure 4 For comparative example 2, the reinforcing member 20 uses three support units. The support units on the left and in the middle are wider, while the support unit on the right is narrower. Other parameters are basically the same or equivalent.
[0056] The bending strength of the embodiments, comparative example 1 and comparative example 2 was tested. The bending strength data of comparative example 1 was 10.4, the bending strength data of comparative example 2 was 8.1, and the bending strength data of the embodiments was 9.5.
[0057] In addition, the actual usage of the soles of the embodiments, comparative examples 1 and 2 was tested. Testers wore the corresponding shoes and performed running and jumping actions, and their descriptions of the wearing conditions were obtained. Among them, comparative example 1 was too stiff and not flexible enough when worn, with a large pulling force when bent and a large force on the metatarsal bone when landing; comparative example 2 was softer, with a moderate pulling force when bent, but still a large force on the metatarsal bone when landing; the embodiments were of moderate stiffness and softness, with a moderate pulling force when bent and a moderate force on the metatarsal bone when landing.
[0058] Therefore, it can be seen that with two support units, the overall bending strength is high, which leads to a decrease in wearing comfort and a greater risk of impact on the metatarsals upon landing. With three support units, although the wearing comfort is better, the metatarsals are still prone to impact upon landing. With four support units, and by adjusting the parameters and positions of the support units, the wearing comfort of the sole is greatly improved, and impact on the metatarsals can be avoided upon landing.
[0059] The aforementioned sole includes an outsole, a midsole 10, and the aforementioned reinforcing member 20. The reinforcing member 20 is attached to the bottom surface of the midsole 10, and the midsole 10 is adapted to be bonded to the outsole to form a sole.
[0060] In addition, the present invention also provides a shoe comprising the aforementioned sole and an upper bonded to the sole.
[0061] The composite processes described above are all conventional techniques in this field, and will not be elaborated upon here.
[0062] This invention provides a reinforcing member for a shoe sole, a shoe sole, and a shoe. The forefoot portion 22 of the reinforcing member 20 is formed by four support units, with the positions of the support units corresponding to the metatarsal bones. The first support unit 31 not only corresponds to the first metatarsal bone but also spans across the first and second metatarsals. Therefore, its position is more lateral than that of a conventional reinforcing member 20, thereby reducing the force exerted by the reinforcing member 20 on the first metatarsal bone when the shoe sole bends. Simultaneously, the force exerted by the foot on the sole can be transmitted to the first support unit 31 through the shoe sole. The deformation-restoring force of the reinforcing member 20 is received from the first support unit 31. In a typical structure, most of the bending force of the forefoot corresponds to the position of the first metatarsal bone. In this reinforcing member 20, the first, second, third, and fourth support units 34 are arranged sequentially, and the ends of the four support units are connected to the arch portion 21 of the reinforcing member 20. By separating the support units, the overall bending stiffness of the forefoot portion 22 can be maintained with only a slight reduction compared to a full-length reinforcing member 20, while also avoiding the deformation of the reinforcing member 20. The excessive structural rigidity at the first metatarsal joint can lead to damage during use. To address this, the stress is distributed among other support units. This ensures that the overall structural rigidity of the forefoot portion 22 of the reinforcing member 20 meets usage requirements while effectively improving protection of the first metatarsal and overall wearing comfort. In the reinforcing member 20, the widths of the first, second, third, and fourth support units 34 at the metatarsophalangeal joint decrease sequentially, and these widths correspond to the width of the foot sole. The design can increase the deformation degree of the first support unit 31 under stress without changing the overall bending rigidity of the reinforcing member 20. This can increase the mobility of the corresponding first metatarsal and reduce the pressure on the first metatarsal. In addition, the deformation force of the forefoot 22 will be transmitted to the arch 21. Since the arch 21 has a sufficiently large contact area with the sole, when the sole bends, the forefoot 22 can quickly recover its deformation by transmitting the force to the sole and then to the foot, thereby significantly improving the rolling performance of the sole and providing more assistance to the user.
[0063] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this invention, but does not constitute a limitation on the scope of protection of this invention. Modifications, equivalent substitutions, or other improvements to the embodiments of this invention or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this invention or the foregoing embodiments, in conjunction with common knowledge, general technical knowledge, and / or existing technology, should all be included within the scope of protection of this invention.
Claims
1. A reinforcing member for shoe soles, characterized in that: The reinforcing member (20) is adapted to extend from the forefoot position to the arch position along the front-back direction of the sole of the foot, and is formed with a forefoot portion (22) and an arch portion (21). The forefoot (22) is formed by four support units distributed in the left-right direction and extending forward from the arch (21). Each support unit is, from the inside to the outside, a first support unit (31), a second support unit (32), a third support unit (33) and a fourth support unit (34). The first support unit (31) is disposed between the first and second metatarsal bones of the foot in the left-right direction, and its width in the front-back direction corresponding to the metatarsophalangeal joint area is 10% to 12% of the width of the foot. The second support unit (32) is disposed between the second and third metatarsal bones of the foot in the left-right direction, and its width in the front-back direction corresponding to the metatarsophalangeal joint area is 7.6% to 9.5% of the width of the foot. The third support unit (33) is disposed between the third and fourth metatarsal bones of the foot in the left-right direction, and its width in the front-back direction corresponding to the metatarsophalangeal joint area is 5.7% to 7.5% of the width of the foot. The fourth support unit (34) is disposed between the fourth and fifth metatarsal bones of the foot in the left-right direction, and its width in the front-back direction corresponding to the metatarsophalangeal joint area is 3.8% to 5.5% of the width of the foot. The first support unit (31) has a thickness of 100% to 120% of the standard thickness corresponding to the metatarsophalangeal joint region; the second support unit (32) has a thickness of 80% to 100% of the standard thickness corresponding to the metatarsophalangeal joint region; the third support unit (33) has a thickness of 80% to 100% of the standard thickness corresponding to the metatarsophalangeal joint region; and the fourth support unit (34) has a thickness of 60% to 80% of the standard thickness corresponding to the metatarsophalangeal joint region. The standard thickness is determined according to the material used in the reinforcing member (20). The curvature of the forefoot (22) to the arch (21) is 15° to 20°.
2. A reinforcing member for a shoe sole as described in claim 1, characterized in that, The width of each support unit from the rear end of the area corresponding to the metatarsophalangeal joint to the arch (21) is not less than the width of the support unit in the area corresponding to the metatarsophalangeal joint.
3. A reinforcing member for a shoe sole as described in claim 2, characterized in that, The width of each support unit between the front end of the region corresponding to the metatarsophalangeal joint and the front end of the support unit is less than or equal to the width of the support unit in the region corresponding to the metatarsophalangeal joint.
4. A reinforcing member for a shoe sole as described in any one of claims 1-3, characterized in that, The reinforcing member (20) is made of carbon fiber.
5. A reinforcing member for a shoe sole as described in claim 4, characterized in that, The standard thickness is 1 mm.
6. A shoe sole, characterized in that, The shoe includes an outsole, a midsole (10), and a reinforcing member (20) for the sole as described in any one of claims 1-5; the reinforcing member (20) is attached to the bottom surface of the midsole (10); the midsole (10) is adapted to be compositely fixed to the outsole to form the sole.
7. A type of shoe, characterized in that, Includes a sole as described in claim 6 and an upper composited thereon.