Gradient deformation sole

Abstract

The utility model discloses a gradient deformation shoe sole belongs to shoe field, a gradient deformation shoe sole, including from below to above setting's lower layer midsole, middle layer midsole and upper layer midsole, the shore hardness D of lower layer midsole is 36 45 degrees, the shore hardness D of middle layer midsole is 28 35 degrees, the shore hardness D of upper layer midsole is 20 27 degrees. The utility model discloses a gradient deformation shoe sole, and the midsole adopts the gradient structure of gradually reducing from below to above shore hardness, and constructs the progressive response mechanism of hard support - middle buffer - soft adhesion, and the impact energy of key frequency band is attenuated in pertinence, and the lower limb load is effectively reduced, and the comfort and safety in the motion are improved.

Description

Technical Field

[0001] This utility model belongs to the field of footwear, and in particular relates to a gradient deformation sole. Background Technology

[0002] During activities such as running, the impact force generated by the foot contacting the ground is transmitted upwards along the lower limbs in the form of shock waves. This impact energy covers multiple frequency ranges, primarily including low-frequency impacts of 4-8 Hz, mid-frequency impacts of 12-20 Hz, and high-frequency impacts of 60-90 Hz. Studies have shown that most of the impact energy in these frequency ranges is absorbed by the lower limb tissues, and the attenuation effect of the lower limbs on the impact is mainly concentrated in specific frequency bands, with the peak impact frequency of the legs being particularly significant in the 10-15 Hz range.

[0003] When the impact force is excessive, the lower limbs, especially the tibia, are prone to fatigue fractures due to continuous excessive load. It may also lead to problems such as lower limb muscle fatigue and joint wear, significantly increasing the risk of sports injuries.

[0004] However, existing shoe sole cushioning designs have significant limitations: on the one hand, traditional shoe sole structures cannot specifically attenuate the impact energy of the aforementioned key frequency bands, making it difficult to effectively reduce the load on the lower limbs, resulting in insufficient comfort and safety during exercise; on the other hand, most shoe sole cushioning materials are prone to fatigue due to long-term repeated stress, and their cushioning performance will gradually decrease with use, which not only shortens the lifespan of the shoe sole, but also further aggravates the negative impact of impact transmission, failing to meet the long-term, efficient cushioning requirements. Utility Model Content

[0005] The purpose of this invention is to propose a gradient deformation sole to overcome at least one of the above-mentioned defects in the prior art.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a gradient deformation shoe sole, comprising a lower midsole, a middle midsole, and an upper midsole arranged sequentially from bottom to top. The lower midsole has a Shore hardness D of 36-45 degrees, the middle midsole has a Shore hardness D of 28-35 degrees, and the upper midsole has a Shore hardness D of 20-27 degrees.

[0008] Preferably, the thickness of the upper insole is 3-9mm, and the thickness of the lower insole and the middle insole is 12-18mm.

[0009] Preferably, the Shore hardness D of the lower insole is 40 degrees, the Shore hardness D of the middle insole is 30 degrees, and the Shore hardness D of the upper insole is 25 degrees.

[0010] Preferably, the lower midsole is made of TPU foam, the middle midsole is made of TPEE foam, and the upper midsole is made of PEBA foam.

[0011] Preferably, it also includes an outsole, which is disposed at the bottom of the lower insole.

[0012] Preferably, the thickness of the outsole is 1-5 mm.

[0013] Preferably, the outsole is made of polyurethane rubber.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. The midsole adopts a gradient structure with gradually decreasing Shore hardness from bottom to top, constructing a progressive response mechanism of hard support-medium cushioning-soft fit, which specifically attenuates the impact energy of key frequency bands, effectively reduces the load on the lower limbs, and improves comfort and safety during exercise.

[0016] 2. Through the gradient mechanical design of the three-layer midsole and the high-frequency absorption characteristics of the outsole, multi-frequency impacts are specifically attenuated, solving the problem that traditional shoe soles cannot cover key impact frequencies, reducing lower limb load and injury risk.

[0017] 3. Through thickness design and material matching, while ensuring a good fit and high-frequency absorption, the overall weight is controlled, improving movement flexibility and avoiding gait interference caused by excessively thick soles. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0019] The labels in the attached diagram are: 1-lower layer midsole, 2-middle layer midsole, 3-upper layer midsole, 4-outsole. Detailed Implementation

[0020] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0021] Contents not described in detail in this specification are existing technologies known to those skilled in the art. In the description of this utility model, it should be understood that terms such as "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this utility model and simplifying the description. They do not 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 this utility model. Furthermore, terms such as "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Example 1:

[0023] like Figure 1 As shown, this embodiment provides a gradient deformation sole, comprising a lower midsole 1, a middle midsole 2, an upper midsole 3, and an outsole 4 arranged sequentially from bottom to top. The lower midsole 1 has a Shore hardness D of 40 degrees, corresponding to an elongation ratio of 5 times. The middle midsole 2 has a Shore hardness D of 30 degrees, corresponding to an elongation ratio of 5.5 times. The upper midsole 3 has a Shore hardness D of 25 degrees, corresponding to an elongation ratio of 6 times. The outsole 4 is located at the bottom of the lower midsole 1. The lower midsole 1, middle midsole 2, and upper midsole 3 form the midsole, with the Shore hardness D gradually decreasing from bottom to top, being the hardest at the bottom and the softest at the top, and the deformation gradually increasing, creating a gradual cushioning effect.

[0024] Structurally, the sole consists of an outsole (4), a lower midsole (1), a middle midsole (2), and an upper midsole (3) arranged from bottom to top, forming a stepped mechanical response system. The outsole (4) is made of polyurethane rubber, boasting a high impact energy absorption rate of 94.7%, specifically designed to attenuate high-frequency impacts of 60-90Hz during the initial ground contact phase. The lower midsole (1) is based on high-modulus damping characteristics with a Shore hardness (D) of 40 degrees and a 5:1 elongation ratio, absorbing the shock wave energy generated by instantaneous impacts through rigid support and efficient energy conversion. The middle midsole (2) employs a medium-modulus damping design with a Shore hardness (D) of 30 degrees and a 5.5:1 elongation ratio, precisely attenuating the 10-15Hz peak tibial impact energy through the synergistic effect of deformation and damping characteristics. The upper midsole (3), with its soft characteristics of a Shore hardness (D) of 25 degrees and a 6:1 elongation ratio, absorbs low-frequency impacts of 4-8Hz through conformal deformation.

[0025] This midsole features a gradient structure with gradually decreasing Shore hardness from bottom to top (40°→30°→25°), creating a progressive response mechanism of hard support-middle buffer-soft fit: upon initial impact, the lower hard structure first bears the load and limits excessive deformation. As the impact force increases, the middle and upper structures successively disperse energy through greater deformation, ultimately achieving a stepwise attenuation of the peak impact force. Combined with the polyurethane rubber outsole, its wide-band damping characteristics can cover the entire impact frequency range of 4-90Hz.

[0026] This invention utilizes a three-layer midsole with gradient mechanical design and a high-frequency absorption feature in the outsole (4) to achieve targeted attenuation of low-frequency (4-8Hz), peak impact frequency (10-15Hz), mid-frequency (12-20Hz), and high-frequency (60-90Hz) impacts. This solves the problem of traditional soles failing to cover key impact frequency bands, significantly reducing lower limb load. The stepped force transmission path, mimicking the body's natural cushioning mechanism, effectively reduces the risk of tibial fatigue fractures, muscle fatigue, and joint wear, improving sports safety. Scientific matching of material modulus and deformation reduces fatigue loss of individual materials, slows down the rate of cushioning performance decay, and extends the sole's lifespan. The soft, conforming characteristics and gradient deformation design of the upper midsole (3) ensure support stability while progressively improving foot fit, balancing safety and comfort during exercise. The layered absorption of impact energy of varying intensities ensures high energy conversion efficiency when dealing with instantaneous impacts and sustained loads, preventing localized damage caused by concentrated energy transfer.

[0027] In this embodiment, the maximum thickness of the upper midsole 3 is 9mm, and the maximum thickness of the lower midsole 1 and the middle midsole 2 is 15mm. The lower midsole 1 is made of TPU foam, the middle midsole 2 is made of TPEE foam, and the upper midsole 3 is made of PEBA foam. The maximum thickness of the outsole 4 is 2mm. The lower midsole 1, made of TPU foam with a maximum thickness of 15mm, combines the high modulus and high damping characteristics of TPU with its greater thickness, allowing for greater structural deformation space to absorb the high frequency and strong impact force of instantaneous impacts, thus improving the initial impact cushioning capacity. The middle midsole 2, made of TPEE foam with a maximum thickness of 15mm, utilizes the medium modulus damping characteristics of TPEE and its same thickness design to form continuous deformation cushioning in the 10-15Hz tibial impact peak frequency band, ensuring efficient attenuation of mid-frequency impact energy. The upper midsole (3) uses PEBA foam material with a maximum thickness of 9mm. The soft and conforming properties of PEBA, combined with its relatively thin thickness, absorb low-frequency impacts of 4-8Hz through moderate deformation, while avoiding the decrease in foot stability caused by excessive thickness, thus improving fit and flexibility. The outsole (4) uses polyurethane rubber material with a maximum thickness of 2mm. Its ultra-thin design ensures a 94.7% high-frequency impact absorption rate while reducing the overall thickness of the sole, avoiding a bulky feel. The abrasion resistance of polyurethane rubber protects the midsole structure and extends its service life. The lower midsole (1), middle midsole (2), and upper midsole (3) are each made of foam material. The foam material has dispersion properties, forming a dense, hierarchical cell network after foaming. In other words, the three midsole layers are made by foaming particles of different sizes (PEBA+TPEE+TPU) to form a multi-layered energy dissipation structure.

[0028] The maximum total thickness of the sole in this embodiment (15mm for the lower layer + 15mm for the middle layer + 9mm for the upper layer + 2mm for the outsole = 41mm) meets the cushioning requirements across the entire frequency range while avoiding redundant design through layered thickness optimization: the core cushioning layers (lower midsole 1 and middle midsole 2) are designed to be thicker, concentrating the impact energy. The thinner design of the upper midsole 3 and outsole 4 ensures a snug fit and high-frequency absorption while controlling the overall weight, improving movement flexibility, and avoiding gait interference caused by an excessively thick sole.

[0029] Example 2:

[0030] The difference between this embodiment and Embodiment 1 is that:

[0031] The lower insole 1 has a Shore hardness D of 36, the middle insole 2 has a Shore hardness D of 28, and the upper insole 3 has a Shore hardness D of 20.

[0032] Example 3:

[0033] The difference between this embodiment and Embodiment 1 is that:

[0034] The lower insole 1 has a Shore hardness D of 45 degrees, the middle insole 2 has a Shore hardness D of 35 degrees, and the upper insole 3 has a Shore hardness D of 27 degrees.

[0035] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A gradient deformation sole, characterized in that: It includes a lower insole (1), a middle insole (2), and an upper insole (3) arranged sequentially from bottom to top; the lower insole (1) has a Shore hardness D of 36-45 degrees; The Shore hardness D of the middle layer insole (2) is 28-35 degrees; The Shore hardness D of the upper insole (3) is 20-27 degrees.

2. The gradient deformation sole according to claim 1, characterized in that: The thickness of the upper insole (3) is 3-9 mm; The thickness of both the lower insole (1) and the middle insole (2) is 12-18 mm.

3. The gradient deformation sole according to claim 1, characterized in that: The Shore hardness D of the lower insole (1) is 40 degrees. The Shore hardness D of the middle layer insole (2) is 30 degrees; The Shore hardness D of the upper insole (3) is 25 degrees.

4. The gradient deformation sole according to claim 1, characterized in that: The material of the lower insole (1) is TPU foam; The material of the middle layer insole (2) is TPEE foam; The upper insole (3) is made of PEBA foam material.

5. The gradient deformation sole according to claim 1, characterized in that: It also includes the base (4); The outsole (4) is located at the bottom of the lower insole (1).

6. The gradient deformation sole according to claim 5, characterized in that: The thickness of the outsole (4) is 1-5 mm.

7. The gradient deformation sole according to claim 5, characterized in that: The outsole (4) is made of polyurethane rubber.

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