TWI818452B - Shoe midsole structure comprising lattice unit inter-embedded with wave spring made by an additive manufacturing process - Google Patents

Abstract

The invention provides a shoe midsole structure comprising a lattice unit inter-embedded with a wave spring made by an additive manufacturing process. The shoe midsole structure is composed of a midsole body and at least one wave spring. The midsole body of the shoe comprises a plurality of pressure-receiving parts that are disposed respectively corresponding to a plurality of parts of sole, and combined with each other. Each pressure-receiving part comprises a plurality of spherical units which are stacked and connected to each other to form a three-dimensional lattice structure. Each pressure-receiving part having a three-dimensional stack structure is formed by stacking a plurality of lattices and fitting them with each other, wherein the lattices have the same or different three-dimensional structure. At least one wave spring is arranged on one of the pressure-receiving parts and combined with the three-dimensional stack structure of the pressure receiving part.

Description

The midsole structure of the shoe is made of inter-embedded lattice units equipped with wave springs.

The present invention relates to a shoe midsole structure produced by a build-up manufacturing method, and in particular to a lattice unit inter-embedded build-up manufacturing shoe midsole structure equipped with wave springs.

Additive manufacturing technology is currently being widely used in the manufacturing of shoe products. Today, all manufacturers of shoe products have adopted the additive manufacturing process as the main process for producing shoe products. However, the existing shoe midsole structure is used to support the sole of the human body and absorb the energy of the sole of the foot when walking, thereby achieving a cushioning effect.

However, since the soles of the human body will walk in different states and at the same time under different road conditions, shoe products are designed differently for different usage conditions, such as walking shoes, jogging shoes, and walking shoes. Each shoe product is usually only suitable for the purpose for which it is designed. Jogging shoes are not suitable for walking, and walking shoes are not suitable for ball sports. The design units of such shoe products must design different shoe midsole structures for different uses or different road conditions, which consumes a lot of design resources and manpower. Therefore, for various shoe products with different needs, how to use a multi-functional shoe midsole structure to meet various needs can provide users with a range of cushioning, mechanical strength and energy absorption/return during walking, running and even jumping.

The object of the present invention is to provide a shoe midsole structure made of inter-embedded lattice units with wave springs, which utilizes wave springs to appropriately match the shoe mid-sole body formed by the inter-embedded three-dimensional stacking structure of lattice units. The multifunctional shoe midsole structure obtained can be applied to different shoe models, and there is no need to individually design the shoe midsole structure for different shoe models with different functions.

The present invention's inter-embedded laminated lattice unit laminated shoe midsole structure equipped with wave springs is used to bear the soles of human feet. One embodiment of the present invention includes a shoe midsole body and at least one wave spring. The midsole body of the shoe includes a plurality of pressure-bearing parts, the plurality of pressure-bearing parts respectively correspond to multiple parts of the sole of the foot, and the plurality of pressure-bearing parts are assembled with each other, and each pressure-bearing part includes a plurality of spherical monomers. The spherical monomers are stacked and connected to each other to form a three-dimensional lattice structure. Each pressure-bearing part is composed of multiple identical or different three-dimensional lattice structures that are stacked and fitted with each other to form a three-dimensional stacked structure. At least one wave spring is disposed on one of the pressure bearing parts and combined with the three-dimensional stack structure of the pressure bearing part.

In another embodiment, each pressure-bearing portion is formed by stacking and fitting the same three-dimensional lattice structure with each other, and adjacent pressure-bearing portions are formed by stacking and fitting different three-dimensional lattice structures with each other.

In another embodiment, it includes a plurality of wave springs, the plurality of wave springs are arranged on a plurality of pressure-bearing parts, and the plurality of pressure-bearing parts of the plurality of wave springs respectively correspond to the forefoot and the forefoot of the sole of the foot. Heel and thumb.

In another embodiment, a plurality of wave springs are provided at the pressure receiving portion corresponding to the forefoot of the foot.

In another embodiment, the size of the wave spring provided corresponding to the pressure receiving portion of the heel is larger than the size of the wave spring provided corresponding to the forefoot.

In another embodiment, the pressure receiving portion where the wave spring is provided has a receiving recess, and the wave spring is disposed in the receiving recess.

In another embodiment, the three-dimensional lattice structure is a simple cubic stacking structure, a body-centered cubic stacking structure or a face-centered cubic stacking structure.

In another embodiment, the plurality of pressure-bearing parts of the shoe midsole body of the present invention respectively correspond to the forefoot, heel and thumb of the sole of the foot, and correspond to the thumb of the sole of the foot. The pressure-bearing part of the forefoot is a three-dimensional stacked structure formed by a diamond structure. The pressure-bearing part of the forefoot is a three-dimensional stacked structure formed by a primitive structure, corresponding to the heel of the foot. The pressure-bearing part at the bottom is a porous gyroid structure to form a three-dimensional stacked structure.

In another embodiment, the wave spring includes a plurality of annular wave elements. The plurality of annular wave elements are stacked along an axial direction. Each annular wave element includes a plurality of wave peaks and a plurality of wave valleys. The wave peaks The wave crests and troughs are arranged staggered with each other along the circumferential direction, and the crests and troughs of each annular wave element respectively correspond to the crests and troughs of the adjacent annular wave element, and the axis perpendicular to a plane parallel to the circumferential direction.

In another embodiment, the three-dimensional stacked structure and at least one annular corrugated element are fabricated by a build-up manufacturing method.

The lattice unit inter-embedded multilayer manufacturing shoe midsole structure equipped with wave springs of the present invention is formed by combining a functionally graded wave spring (FGWS) with a three-dimensional stacked structure with a minimum curved surface of three-dimensional period. Formed, the number and position of functional gradient wave springs can be adjusted to obtain a midsole structure adapted to different shoe styles. The three-dimensional stacked structure is formed by inserting three-dimensional lattice structures formed by stacking and connecting spherical monomers to each other. The midsole body composed of functional gradient wave springs and a three-dimensional stacked structure of spherical monomers is matched and set in pressure-bearing areas corresponding to different parts of the sole of the foot to match shoes for different purposes, so there is no need to specify Special-purpose midsole structures are developed individually for shoes with different uses, and a multi-functional midsole structure can be obtained.

Please refer to FIGS. 1 , 2 , 3 , 5 and 7 , which illustrate an embodiment of the midsole structure of a shoe midsole manufactured by inter-embedding lattice units equipped with wave springs according to the present invention. The lattice unit inter-embedded multi-layer manufactured shoe midsole structure (hereinafter referred to as the shoe midsole structure) 100 equipped with wave springs in this embodiment is used to be disposed in a shoe product, and is disposed between the outsole and the insole of the shoe. In between, the outsole is used for grip and friction resistance, the insole is used to contact the sole of the foot to provide wearing comfort, and the midsole is used to absorb the impact energy of the sole of the foot when walking or running as a shock absorber and buffer. . The sole of the human body is roughly divided into the toe part, the forefoot part, the arch part and the heel part according to the structure and supporting function. The midsole structure of the shoe in this embodiment corresponds to each part of the human foot sole, so as to correspond to the impact of different parts on the sole. exerted pressure.

The midsole structure 100 of this embodiment includes a midsole body 10 and at least one wave spring 20 . The shoe midsole body 10 includes a plurality of pressure-receiving parts 11, and the plurality of pressure-receiving parts 11 respectively correspond to multiple parts of the sole of the foot. The pressure receiving portions 11a, 11b, 11c, and 11d respectively correspond to the thumb portion, forefoot portion, arch portion, and heel portion of the sole of the foot.

Each pressure-bearing part 11 is composed of a three-dimensional stack structure formed by stacking and fitting three-dimensional lattice structures with each other, that is, a three-dimensional stack structure forming a triply periodic minimal surface (TPMS). The three-dimensional lattice structure is formed by stacking and connecting spherical monomers to each other. The three-dimensional lattice structure in this embodiment may be a diamond structure, a unit cell structure or a porous spiral structure.

Please refer to FIG. 2 , which shows the structure of the pressure receiving portions 11 a , 11 b , 11 c and 11 d of the shoe midsole body 10 corresponding to the thumb, forefoot, arch and heel of the foot. The pressure-receiving portion 11a corresponds to the thumb portion of the sole of the foot, which receives the smallest force when the sole of the foot is in various postures. Therefore, the pressure-receiving portion 11a is formed into a diamond structure with a minimum wall thickness. The pressure-receiving portions 11b and 11c respectively correspond to the forefoot and arch portion of the foot. The pressure-receiving portions 11b and 11c provide support to the sole of the foot and allow the sole of the foot to withstand minimal compression and bending. Therefore, the pressure-receiving portions 11b and 11c are formed with Medium-walled primary cell structure. The pressure receiving portion 11d corresponds to the heel portion of the sole of the foot. Since the heel portion bears the greatest force when the sole of the foot is in various postures, the pressure receiving portion 11d forms a porous spiral structure with the largest wall thickness. In order to clearly show the structure of each part of the shoe midsole body 10 shown in Figure 2, the wave spring 20 is omitted.

Each pressure-bearing part 11 may be stacked by the same three-dimensional lattice structure, or may be stacked by different three-dimensional lattice structures. For example, the pressure-receiving part 11a corresponding to the thumb has a diamond structure, and the pressure-receiving part 11b corresponding to the forefoot is formed by stacking and fitting each other with primitive structures to form a three-dimensional stacked structure. The pressure-receiving part 11b corresponding to the arch of the foot is The pressure-bearing part 11c of the foot is a simple cubic stacked structure, while the pressure-bearing part 11d corresponding to the heel part of the foot is a porous spiral structure (gyroid structure) to form a three-dimensional stacked structure. The pressure-bearing part 11 can be stacked using different three-dimensional lattice structures according to the compressive stress and shear stress of each human foot part. Then a plurality of pressure-bearing parts 11a, 11b, 11c and 11d are assembled with each other to form the shoe midsole body 10, that is, the shoe midsole body 10 is a multi-morphology/graded three-dimensional periodic minimum curved surface structure (Multi-morphology/Graded TPMS) structured). Polymorphism here refers to a structure formed by stacking multiple three-dimensional lattice structures.

At least one wave spring 20 is disposed on one of the pressure receiving parts 11 and is combined with the three-dimensional stack structure of the pressure receiving part 11 . The pressure receiving parts 11a, 11b and 11d of this embodiment are respectively provided with wave springs 20a, 20b, 20c and 20d, which correspond to the thumb, forefoot and heel parts of the sole of the foot. The pressure receiving portions 11a, 11b and 11d are respectively provided with accommodating recesses 30, and the wave springs 20a, 20b, 20c and 20d are disposed in the accommodating recesses 30 of the pressure receiving portions 11a, 11b and 11d. The accommodating recess 30 can also be filled with foam material or auxiliary material, which can increase the positioning characteristics of 20a, 20b, 20c and 20d on the one hand and enhance the buffering effect on the other hand.

The midsole body 10 and the wave spring 20 of this embodiment are manufactured by additive manufacturing, that is, three-dimensional printing. The midsole structure 100 of this embodiment is manufactured by continuous liquid interface production technology. Production, CLIP) generation, that is, the material is solidified by irradiating ultraviolet light in the material liquid tank, and the cured material is attached to the forming plate, and then the forming plate gradually rises to form the material layer by layer to obtain this product. Inventive shoe midsole structure 100.

In this embodiment, the pressure receiving portion 11a corresponding to the thumb and the pressure receiving portion 11d corresponding to the heel are respectively provided with one wave spring 20a and 20d, while the pressure receiving portion 11b corresponding to the forefoot is provided with two wave springs. A wave spring 20b. The position, quantity and size of the wave spring can be set according to actual needs.

Please refer to Figures 3, 5 and 7, which respectively show the wave spring 20a provided at the pressure receiving portion 11a corresponding to the thumb, the wave spring 20b provided at the pressure receiving portion 11b corresponding to the forefoot and the wave spring 20b provided at the pressure receiving portion 11b corresponding to the forefoot. The wave spring 20d of the pressure receiving part 11d corresponding to the heel part. The wave springs 20a, 20b, 20c and 20d include a plurality of annular wave elements 21. The annular wave elements 21 are stacked along an axial direction. Each annular wave element 21 includes a plurality of wave peaks 21a and a plurality of wave peaks 21a. The trough portion 21b, the plurality of crest portions 21a and the plurality of trough portions 21b are staggered with each other along the circumferential direction, and the plurality of crest portions 21a and the plurality of trough portions 21b of each annular waveform element 21 respectively correspond to adjacent annular The axial direction of the plurality of crest portions 21a and the plurality of trough portions 21b of the waveform element 21 is perpendicular to a plane parallel to the circumferential direction. The annular waveform element 21 can be a rectangular profile, a variable-width profile, a thickness-adjustable profile, a rounded corner profile, a non-contact profile, a flat strip profile, an elliptical profile, a push profile or a circular profile, and can be based on the design. Make changes according to needs.

Please refer to Figures 4, 6 and 8, which respectively illustrate the wave spring 20a provided on the pressure receiving part 11a, the wave springs 20b, 20c provided on the pressure receiving part 11b and the wave spring provided on the pressure receiving part 11d. 20d, as shown in the figure, under the same amount of deformation, the load that the wave spring 20a can bear is greater than the load that the wave spring 20b can bear. Under the same amount of deformation, the load that the wave springs 20b and 20c can bear is greater than The load that the wave spring 20d can bear. The maximum load that the wave spring 20a can bear is 814 Newtons, the wave spring 20b can bear a maximum load of 734 Newtons, and the wave spring 20d can bear a maximum load of 937 Newtons.

The wave springs 20a, 20b, 20c and 20d are formed from functionally graded materials to obtain functionally graded wave springs (FGWS), which have higher energy absorption, energy return and rigidity. Compared with The existing technology uses a metal coil spring, which only requires 50% of the height of the coil spring. In addition to avoiding the puncture problem caused by damage to the soles of the feet when the spring is damaged, it can also achieve the same performance as a metal coil spring. In terms of rigidity and shock absorption, in the fatigue test, after 100 cycles of loading and unloading, the energy loss of the existing metal coil spring increased by 36% compared with the functional gradient wave spring. In addition, the shoe midsole structure 100 provided with wave springs of the present invention can be lightweight and has the same performance as the traditional shoe midsole structure made entirely of elastic materials compared to the existing shoe midsole structures made entirely of elastic materials. Set up better shock-absorbing buffering effect.

The lattice unit inter-embedded multilayer manufacturing shoe midsole structure equipped with wave springs of the present invention is formed by combining a functionally graded wave spring (FGWS) with a three-dimensional stacked structure with a minimum curved surface of three-dimensional period. Formed, the number and position of functional gradient wave springs can be adjusted to obtain a midsole structure adapted to different shoe styles. The three-dimensional stacked structure is formed by inserting three-dimensional lattice structures formed by stacking and connecting spherical monomers to each other. The midsole body composed of functional gradient wave springs and a three-dimensional stacked structure of spherical monomers is matched and set in pressure-bearing areas corresponding to different parts of the sole of the foot to match shoes for different purposes, so there is no need to specify Special-purpose shoe midsole structures are developed individually for different uses of shoes, and a multi-functional shoe midsole structure can be obtained.

However, the above are only preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, that is, simple equivalent changes and modifications may be made based on the patentable scope of the present invention and the description of the invention. , are still within the scope covered by the patent of this invention. In addition, any embodiment or patentable scope of the present invention does not necessarily achieve all the purposes, advantages or features disclosed in the present invention. In addition, the abstract section and title are only used to assist in searching patent documents and are not intended to limit the scope of the invention. In addition, terms such as "first" and "second" mentioned in this specification or the patent application are only used to name elements or distinguish different embodiments or scopes, and are not used to limit the number of elements. upper or lower limit.

10: Shoe midsole body 11: Pressure-bearing department 11a, 11b, 11c, 11d: Pressure receiving part 20: Wave spring 20a, 20b, 20c, 20d: wave spring 21: Ring wave component 21a: Crest part 21b: Trough 30: Accommodation recess 100: Shoe midsole structure

FIG. 1 is a perspective view of an embodiment of a shoe midsole structure equipped with wave springs and constructed by inter-embedding lattice units according to the present invention. Figure 2 is a top view of the shoe midsole body of the shoe midsole structure equipped with a wave spring and inter-embedded lattice unit laminate manufacturing shoe midsole structure of the present invention. FIG. 3 is a perspective view of the lattice unit inter-embedded multilayer manufacturing shoe midsole structure equipped with wave springs in FIG. 1 , with the wave springs disposed in the thumb area corresponding to the sole of the foot. FIG. 4 is a graph showing the relationship between load and compression deformation of the wave spring of FIG. 3 . FIG. 5 is a perspective view of the lattice unit inter-embedded multilayer manufacturing shoe midsole structure equipped with wave springs in FIG. 1 , with the wave springs disposed in the forefoot area corresponding to the sole of the foot. FIG. 6 is a graph showing the relationship between load and compression deformation of the wave spring of FIG. 5 . FIG. 7 is a perspective view of the wave spring arranged in the heel area corresponding to the sole of the foot of the lattice unit inter-embedded multilayer manufacturing shoe midsole structure equipped with wave springs in FIG. 1 . FIG. 8 is a graph showing the relationship between load and compression deformation of the wave spring of FIG. 7 .

10: Shoe midsole body 11: Pressure-bearing department 11a, 11b, 11c, 11d: Pressure receiving part 20: Wave spring 20a, 20b, 20c, 20d: wave spring 30: Accommodation recess 100: Shoe midsole structure

Claims (8)

A lattice unit inter-embedded laminated manufacturing shoe midsole structure equipped with wave springs is used to bear the soles of the human body. The lattice unit inter-embedded laminated manufacturing shoe mid-sole structure equipped with wave springs includes: a shoe midsole The main body includes a plurality of pressure-bearing parts. The pressure-bearing parts respectively correspond to multiple parts of the foot. The pressure-bearing parts are assembled with each other. Each of the pressure-bearing parts includes a plurality of spherical monomers. Equispherical monomers are stacked and connected to each other to form a three-dimensional lattice structure, and each pressure-bearing portion is composed of multiple identical or different three-dimensional lattice structures that are stacked and fitted with each other to form a three-dimensional stacked structure; and at least one wave spring, The three-dimensional stacked structure provided on one of the pressure-bearing parts and combined with the pressure-bearing part; wherein the three-dimensional lattice structure is a diamond structure, a unit cell structure or a porous spiral structure; corresponding to the pressure of the thumb part of the foot The bearing part forms the three-dimensional stacked structure with a diamond structure; the pressure bearing part corresponding to the forefoot of the foot forms the three-dimensional stacked structure with the primitive structure, corresponding to the sole of the foot The pressure-bearing part of the heel is formed with the porous gyroid structure to form the three-dimensional stacked structure. The inter-embedded laminated midsole structure of lattice units equipped with wave springs as described in claim 1, wherein each of the pressure-bearing parts is formed by stacking and fitting the same three-dimensional lattice structures with each other, and the The adjacent pressure-bearing parts are formed by stacking and fitting different three-dimensional lattice structures with each other. The inter-embedded laminated manufacturing shoe midsole structure of lattice units equipped with wave springs as described in claim 1, which includes a plurality of wave springs, and the wave springs are arranged at multiple pressures The pressure-bearing parts provided with the wave springs respectively correspond to the forefoot, heel and thumb of the sole of the foot. The inter-embedded laminated shoe midsole structure of lattice units equipped with wave springs as described in claim 3, wherein the pressure bearing portion corresponding to the forefoot of the foot is provided with a plurality of wave springs. The lattice unit inter-embedded laminated shoe midsole structure equipped with a wave spring as described in claim 3, wherein the size of the wave spring provided corresponding to the pressure bearing portion of the heel is larger than that corresponding to the pressure bearing portion of the heel. The size of the wave spring provided on the front foot. The inter-embedded laminated shoe midsole structure of lattice units equipped with wave springs as described in claim 1, wherein the pressure bearing portion where the wave spring is provided has a receiving recess, and the wave spring is disposed in the container. Place the concave part. The lattice unit inter-embedded built-up shoe midsole structure equipped with a wave spring as described in claim 1, wherein the wave spring includes a plurality of annular wave elements, and the annular wave elements are stacked along an axial direction It is provided that each annular waveform element includes a plurality of crest portions and a plurality of trough portions, the crest portions and the trough portions are staggered with each other along the circumferential direction, and the crest portions of each annular waveform element are The trough portions respectively correspond to the crest portions and the trough portions of the adjacent annular wave-shaped element, and the axial direction is perpendicular to a plane parallel to the circumferential direction. The inter-embedded laminated manufacturing shoe midsole structure of lattice units equipped with wave springs as described in claim 1, wherein the three-dimensional stacked structure and the at least one wave spring are made by a laminated manufacturing method.