JP2022155582A - Sole structure - Google Patents

Abstract

To reduce a load on the foot of a shoe wearer.SOLUTION: A sole structure 10 includes: a placement part 20 which has on the upper side a placing surface Sf1 for placing a shoe wearer's foot Ft and which has on the lower side a first grounding surface Sf2 for grounding on a road surface; and a projection part 30 which projects rearward from the rear end 20a of the placement part 20 and which has on the lower side a second grounding surface Sf3 for grounding on a road surface. The road surface projection area of the second grounding surface Sf3 is 10% or more of the road surface projection area of the first grounding surface Sf2. The projection part 30 is provided with an upper side layer 31 and a lower side layer 32 that is arranged on a side lower than the upper side layer 31 and that has cushioning properties higher than the upper side layer 31.SELECTED DRAWING: Figure 5

Description

The present invention relates to a sole structure for running shoes.

Patent Literature 1 discloses a sole structure of a shoe.

Japanese Patent No. 5568699

By the way, in sports shoes for running (hereinafter referred to as "shoes"), there is generally a demand to reduce the burden on the wearer's feet. In particular, the sole structure of the shoe should be designed to reduce the reaction force that the sole receives from the road surface when the shoe touches the road surface (hereinafter referred to as "at the time of contact with the ground"). Here, the reaction force that the sole receives from the road surface reaches the first peak at the moment of contact with the ground, and after the first peak, when the body sinks, that is, the load becomes the largest (hereinafter referred to as "maximum load The second peak is the hour (referred to as "hour"). Hereinafter, the peak of the reaction force from the road surface at the moment of contact with the ground is referred to as "first peak", and the maximum load is referred to as "second peak". In order to reduce the burden on the feet, it is important to comprehensively reduce the reaction force from the road surface so as to reduce both the first peak and the second peak.

However, the conventional sole structure does not have the viewpoint of reducing the first peak and the second peak, and cannot comprehensively reduce the reaction force from the road surface. Therefore, there is a problem that the burden on the foot cannot be sufficiently reduced.

The present disclosure has been made in view of this point, and its purpose is to reduce the burden on the wearer's feet.

A first disclosure relates to a sole structure of a shoe, which has a mounting surface on which the shoe wearer's foot is mounted on the upper side, and a first grounding surface that can be grounded on the road surface on the lower side. and a protrusion projecting rearward from the rear end of the placing part and having a second ground contact surface on the lower side that can be grounded on the road surface, and the projected road surface area of the second ground contact surface is the first road surface. It is 10% or more of the projected road surface area of the ground contact surface, and the projecting portion has an upper layer and a lower layer arranged below the upper layer and having higher cushioning properties than the upper layer. In this specification, the road surface projected areas of the first contact surface and the second contact surface mean the areas obtained by projecting the first contact surface and the second contact surface onto a horizontal road surface, respectively.

In the first disclosure, the sole structure has two ground contact surfaces, the first contact surface of the mounting portion and the second contact surface of the protrusion, so that the sole is more likely to contact the ground during running compared to having only the first contact surface. Longer contact time between structure and road surface. As a result, the reaction force received from the road surface is reduced, and the load applied from the road surface to the soles of the feet can be reduced. As a result, the burden on the wearer's feet can be reduced.

In a second disclosure, in the first disclosure, the placement portion is arranged such that the first ground contact surface gradually separates from the road surface and gradually faces forward as it goes from the rear side to the front side of the wearer's forefoot. A region having a rocker portion that is curved in a side view and provided with the rocker portion is 25% rearward of the length of the placing portion in the leg length direction from the front end portion of the placing portion in the foot length direction. and the thickness of the sole structure is 20 mm or more at the wearer's forefoot.

In the second disclosure, since the wearer has a rocker portion in the forefoot portion, the movement of the wearer's foot and the sole structure with respect to the road surface prior to kicking off during running is forward along the first contact surface of the rocker portion. It becomes a movement that rotates. As a result, the reaction force that the sole of the foot receives from the road surface before kicking out smoothly moves from the rear side of the forefoot portion to the front side. That is, it is possible to avoid a sudden change in the portion of the sole that receives the reaction force during running. In particular, the region in which the rocker portion is provided is within a range from the tip of the placing portion to a position 25% rearward of the length of the placing portion in the leg length direction in the leg length direction, Since the thickness of the sole structure in the forefoot is 20 mm or more, the effect is enhanced. As a result, the burden on the wearer's feet can be further reduced.

A third disclosure is, in the second disclosure, a front side having higher rigidity than the placement portion, which is arranged in or above the placement portion at the position of the forefoot portion, and which is curved along the rocker portion in a side view. A plate member is further provided.

In the third disclosure, since the front plate member curved along the rocker portion and having higher rigidity than the mounting portion is further provided at the position of the forefoot portion, the shape of the rocker portion is stably maintained by the front plate member. be done. Therefore, the effect of the second disclosure that the wearer's foot and the sole structure rotate forward along the rocker portion relative to the road surface before kicking off during running can be reliably achieved. can. As a result, the burden on the wearer's feet can be further reduced.

A fourth disclosure is any one of the first to third disclosures, wherein the volume of the lower layer is larger than the volume of the upper layer.

In the fourth disclosure, the volume of the lower layer is larger than the volume of the upper layer, so the sole structure can have a higher cushioning property. As a result, the burden on the wearer's feet can be further reduced.

A fifth disclosure is any one of the first to fourth disclosures, wherein the rear plate is disposed between the upper layer and the lower layer in the protrusion and has higher rigidity than the upper layer and the lower layer A member is further provided.

The fifth disclosure further includes a rear plate member disposed between the upper layer and the lower layer and having higher rigidity than the upper layer and the lower layer, thereby reliably maintaining the shape of the protrusion and 1 can be more easily achieved. As a result, the burden on the wearer's feet can be further reduced.

A sixth disclosure is based on the fifth disclosure, wherein, in plan view, the upper layer of the projecting portion extends only forward from the peripheral edge portion of the rear plate member, while the lower layer extends only forward from the peripheral edge of the rear plate member. The shape of the rear plate member is a wavy shape with peaks and valleys when viewed from the side, and the rear end of the rear plate member is a peak. Department.

In a sixth disclosure, the upper layer extends only forward of the perimeter of the rear plate member, while the lower layer extends both forward and rearward of the perimeter of the rear plate member. Therefore, the lower layer is provided over a wider area than the upper layer. Further, since the rear end portion of the rear plate member disposed between the upper layer and the lower layer is the peak portion, the lower layer also forms the peak portion below the rear end portion of the rear plate member. It becomes a shape along. With the above configuration, the volume of the lower layer with high cushioning properties can be easily made larger than that of the upper layer. That is, the cushioning property of the sole structure can be enhanced. As a result, the burden on the wearer's feet can be further reduced.

In a seventh disclosure, in any one of the first to sixth disclosures, at least one of the placing portion and the protruding portion is provided with a hollow portion penetrating vertically.

In the seventh disclosure, since at least one of the placing portion and the projecting portion is provided with the hollow portion, the sole structure can be lightened by the amount of the hollow portion. As a result, the burden on the wearer's feet can be further reduced.

An eighth disclosure is the third disclosure, further comprising a rear plate member disposed between the upper layer and the lower layer in the projection and having a higher rigidity than the upper layer and the lower layer, and a front plate member At least one of the rear plate member and the rear plate member is provided with a plate cavity penetrating vertically.

In the eighth disclosure, since at least one of the front plate member and the rear plate member is provided with the plate cavity, the sole structure can be lightened. As a result, the burden on the wearer's feet can be further reduced.

In a ninth disclosure, in any one of the first to eighth disclosures, the length of the protrusion in the leg length direction is 30 mm or more.

In the ninth disclosure, the length of the protrusion in the leg length direction is 30 mm or more, so the effect of the first disclosure is particularly enhanced. As a result, the burden on the wearer's feet can be further reduced.

In a tenth disclosure, in the first disclosure, the first ground contact surface extends from a position on the front side of the rear end portion of the mounting portion toward a position corresponding to the rear end portion of the mounting portion in a side view. Sloping and/or curving away from the road surface. The second ground contact surface is continuous with the first ground contact surface in a side view, and is inclined and separated from the road surface from a position corresponding to the rear end portion of the mounting portion toward the rear end portion of the protrusion. / Or curved.

According to the tenth disclosure, it is possible to keep the second contact surface in contact with the road surface relatively long during running. As a result, it is possible to reduce the second peak of the reaction force received from the road surface. Therefore, according to the tenth disclosure, it is possible to reduce the burden on the wearer's body (especially the legs) during running. Especially for a wearer running at a slow pace, the wearer's foot can be supported to promote smooth contact with the ground.

In an eleventh disclosure based on the tenth disclosure, the protrusion includes a first protrusion positioned on the medial shell side and a second protrusion positioned on the outer shell side. The first projecting portion and the second projecting portion are spaced apart from each other in the foot width direction.

In the eleventh disclosure, since the first projecting portion and the second projecting portion are separated in the foot width direction, even if the wearer's foot is biased toward the outer instep side or the inner instep side at the time of grounding, Also, the cushioning property of each of the first projection and the second projection facilitates the wearer to maintain balance when the grounding is on the ground. In particular, a wearer running at a slow pace can obtain a smooth running feeling while maintaining balance at the time of contact with the ground.

A twelfth disclosure is the tenth disclosure, further comprising an outsole, wherein the first contact surface and the second contact surface are formed by the lower surface of the outsole. The outsole is configured such that a region corresponding to the rear foot portion and outer instep side of the wearer's foot has higher abrasion resistance than other regions.

According to the twelfth disclosure, it is possible to appropriately protect the region corresponding to the rear foot portion and the lateral instep side of the foot when the ground touches the ground. In particular, wearers who run at a slow pace tend to rub the area corresponding to the rear foot and outer instep side of the foot on the ground when the ground is touched. It is possible to reduce the wear and tear of the shoe on a person, and particularly improve the wear durability of the outer shell side region of the protrusion.

In a thirteenth disclosure, in the tenth disclosure, the mounting portion includes a midsole and a front plate member harder than the midsole. The front side plate member is arranged on the placing portion at a position corresponding to the forefoot portion of the wearer's foot.

According to the thirteenth disclosure, it is possible to increase the flexural rigidity at the position corresponding to the forefoot portion of the wearer's foot in the sole structure. As a result, during running, the center of gravity tends to shift forward after the ground contact, and forward rolling can be encouraged.

A fourteenth disclosure is the thirteenth disclosure, wherein the hardness of the front plate member is set to 70A or more in durometer A.

According to the 14th disclosure, the flexural rigidity at the position corresponding to the forefoot portion of the wearer's foot in the sole structure can be increased in the same manner as the above effects of the 13th disclosure.

In a fifteenth disclosure based on the tenth disclosure, the mounting portion includes a midsole and a rear plate member harder than the midsole. The rear plate member is arranged in a range from a position corresponding to the middle foot portion of the wearer's foot to a position corresponding to the rear foot portion of the placing portion.

According to the fifteenth disclosure, it is possible to increase the flexural rigidity of the sole structure at positions corresponding to the midfoot portion and rearfoot portion of the wearer's foot.

As described above, according to the present disclosure, the load on the wearer's feet can be reduced.

FIG. 1 is an overall perspective view showing the sole structure according to the first embodiment. FIG. 2 is an exploded perspective view showing the sole structure according to the first embodiment. FIG. 3 is a plan view showing a sole structure in which the skeletal structure of the wearer's foot is virtually overlaid, viewed from above. FIG. 4 is a bottom view of the sole structure according to the first embodiment, viewed from below. FIG. 5 is a side view showing the sole structure according to the first embodiment as seen from the inside. FIG. 6 is a sectional view taken along line VI-VI of FIG. FIG. 7 is a graph schematically showing how the reaction force received by the sole structure from the road surface changes with time when the wearer of the shoe having the general sole structure runs. FIG. 8 is an overall perspective view of the sole structure according to the second embodiment as seen from the rear and above. FIG. 9 is an overall perspective view of the sole structure according to the second embodiment as seen from the rear and below. FIG. 10 is a plan view of the sole structure according to the second embodiment. FIG. 11 is a bottom view of the sole structure according to the second embodiment. FIG. 12 is a side view of the sole structure according to the second embodiment when viewed from the medial side. FIG. 13 is a side view of the sole structure according to the second embodiment when viewed from the outer shell side. 14 is a cross-sectional view taken along line XVI-XVI of FIG. 10. FIG. 15 is a cross-sectional view taken along the line XV-XV of FIG. 10. FIG. 16 is a cross-sectional view along line XIV-XIV of FIG. 10. FIG.

Hereinafter, embodiments of the present disclosure will be described in detail based on the drawings. The following description of the embodiments is merely exemplary in nature and is not intended to limit the present disclosure, its applications or uses.

[First embodiment]
1-6 show a sole structure 10 according to a first embodiment of the present disclosure. A shoe (not shown) having this sole structure 10 is used as a sports shoe for running.

Here, the sole structure 10 is illustrated for left foot shoes. The sole structure of the right foot shoe is configured to be bilaterally symmetrical with that of the left foot shoe. Therefore, in the following description, only the sole structure 10 of the left-foot shoe will be described, and the description of the sole structure of the right-foot shoe will be omitted.

In the following description, the upper side (upper side) and the lower side (lower side) represent the vertical positional relationship of the sole structure 10 . Specifically, the upper side (upper side) refers to the side of the sole structure 10 on which the shoe wearer's foot Ft, which will be described later, is located. The lower side (lower side) refers to the side of the sole structure 10 on which the road surface (that is, the side opposite to the foot Ft) is located. Further, the front side and the rear side represent the positional relationship of the sole structure 10 in the foot length direction. Specifically, the front side refers to the side of the sole structure 10 corresponding to the toe portion of the wearer's foot Ft (see FIG. 3). The rear side refers to the side of the sole structure 10 that corresponds to the heel of the wearer's foot (see FIG. 3). Also, the medial side (medial instep side) and the lateral side (lateral instep side) represent the positional relationship of the sole structure 10 in the foot width direction. In FIG. 3, in the sole structure 10, the range corresponding to the forefoot portion of the foot Ft of the shoe wearer is indicated by F, and the range corresponding to the middle foot portion of the wearer's foot Ft is indicated by M. The range corresponding to the rear foot portion of the person's foot Ft is indicated by symbol H.

≪Sole structure≫
First, the overall configuration of the sole structure 10 will be described.

The sole structure 10 has a placing surface Sf1 on which the shoe wearer's foot Ft is placed on the upper side, and a first grounding surface Sf2 on the lower side that can be grounded on the road surface. A protruding portion 30 protrudes rearward from a rear end portion 20a of 20 and has a second ground contact surface Sf3 on the lower side that can be grounded on the road surface.

Specifically, the length of the protrusion 30 in the leg length direction is 30 mm or more. Further, the projected road surface area of the second ground contact surface Sf3 (that is, the area projected onto the horizontal road surface) is 10% or more of the projected road surface area of the first ground contact surface Sf2.

The projecting portion 30 has an upper layer 31 and a lower layer 32 arranged below the upper layer 31 and having higher cushioning properties than the upper layer 31 (see FIG. 5). In plan view (see FIG. 3), the peripheral edge portion 32a of the lower layer 32 is located on the rear side of the peripheral edge portion 31a of the upper layer 31 . Therefore, the lower layer 32 is provided over a wider area than the upper layer 31 in plan view. Also, the volume of the lower layer 32 is larger than the volume of the upper layer 31 . For example, the volume of lower layer 32 is 120% or more of the volume of upper layer 31 .

Next, constituent members of the sole structure 10 will be described.

<Midsole>
As shown in FIGS. 1-6, sole structure 10 includes midsole 40 . The midsole 40 is formed in a shape that follows the sole of the wearer's foot so as to support the foot Ft of the wearer. The upper surface of the midsole 40 forms a mounting surface Sf1. The thickness of the midsole 40 at the mounting surface Sf1 is, for example, 20 to 32 mm, and particularly the thickness at the forefoot portion F is 20 mm or more from the viewpoint of enhancing the function of the rocker portion R, which will be described later.

The midsole 40 is provided with a peripheral edge portion 40a protruding upward from the mounting surface Sf1 along the outer periphery of the mounting surface Sf1. In addition, in the shoe having the sole structure 10, an upper (not shown) for covering the wearer's foot Ft is provided on the peripheral portion 40a.

The midsole 40 is composed of a first midsole portion 41 , a second midsole portion 42 and a third midsole portion 43 . In addition, in the projecting portion 30 of the sole structure 10, the second midsole portion 42 constitutes the upper layer 31, and the third midsole portion 43 constitutes the lower layer 32 (see FIG. 3).

Examples of materials for the first midsole portion 41 include thermoplastic synthetic resins such as ethylene-vinyl acetate copolymer (EVA) and their foams, thermosetting resins such as polyurethane (PU) and their foams, and butadiene rubber. and rubbers such as chloroprene rubber and foams thereof are suitable. Examples of materials for the second midsole portion 42 and the third midsole portion are the same as those exemplified for the material for the first midsole portion 41 . The material of the third midsole portion 43 is a material with higher cushioning properties than the material of the second midsole portion 42 .

The first midsole portion 41 is formed in a shape along the forefoot portion F excluding the toe portion in plan view so as to support the forefoot portion F (see FIGS. 1 to 3). The upper surface of the first midsole portion 41 forms a mounting surface Sf1 of the forefoot portion F. As shown in FIG.

The second midsole portion 42 is formed in a shape along the entire sole of the wearer's foot in plan view, and is arranged at a position corresponding to the entire sole. The second midsole portion 42 is formed with a recessed portion 42a recessed downward in the forefoot portion F, and the first midsole portion 41 is arranged in the recessed portion 42a. In other words, the second midsole portion 42 is layered under the first midsole portion 41 in the forefoot portion F. As shown in FIG.

The second midsole portion 42 has a rocker portion R curved in a side view so that the lower surface of the forefoot portion F gradually rises and faces forward as the lower surface moves from the rear side to the front side. (see FIGS. 2, 5 and 6). The region in which the rocker portion R is provided is within the range from the front end portion of the placing portion 20 to the position P which is 25% behind the length of the placing portion 20 in the leg length direction in the leg length direction. (see FIGS. 5 and 6).

In addition, the upper surface of the second midsole portion 42 forms a mounting surface Sf1 at the portion where the first midsole portion 41 is not arranged on the upper side (that is, the toe portion, the middle foot portion M, and the hindfoot portion H). is doing. The upper surface (mounting surface Sf1) of the second midsole portion 42 is substantially flat rearward from the concave portion 42a (see FIG. 6).

The third midsole portion 43 is formed in a shape along the middle foot portion M and the rear foot portion H (see FIG. 2). The third midsole portion 43 is layered under the second midsole portion 42 in the middle foot portion M and the rear foot portion H. As shown in FIG. The third midsole portion 43 is provided with a hollow portion 43a penetrating in its thickness direction (vertical direction) (see FIGS. 2 and 6).

<Plate member>
The sole structure 10 includes a plate member 50 (rear plate member) (see FIG. 2). The plate member 50 is formed in a shape that follows the contours of the middle foot portion M and the rear foot portion H. As shown in FIG. The plate member 50 is laminated between the second midsole portion 42 and the third midsole portion 43 in the middle foot portion M and the rear foot portion H. As shown in FIG.

The plate member 50 is a member for increasing the rigidity of the range from the midfoot portion M to the rearfoot portion H in the sole structure 10 . The plate member 50 is composed of a thin layer having higher rigidity than the midsole 40 and an outsole 60, which will be described later.

The plate member 50 is preferably made of hard elastic material. Specific examples of hard elastic materials include thermoplastic resins such as thermoplastic polyurethane (TPU), polyamide elastomer (PAE), and ABS resin, and thermosetting resins such as epoxy resins and unsaturated polyester resins. A fiber reinforced plastic (FRP) using carbon fiber, aramid fiber, glass fiber, or the like as reinforcing fiber and thermosetting resin or thermoplastic resin as matrix resin may be used.

The shape of the plate member 50 is a wavy shape having peaks 50a and valleys 50b when viewed from the side (see FIGS. 5 and 6). Specifically, the plate member 50 has a peak portion 50a formed rearward from the middle foot portion M, and a valley portion 50b formed rearward on the rear side. A peak portion 50 a is further formed on the rear side of the valley portion 50 b , and the rear peak portion 50 a is the rear end portion of the plate member 50 .

Further, the peripheral edge portion 50c of the plate member 50 is aligned with the peripheral edge portion 31a of the upper layer 31 in plan view (see FIG. 3). Therefore, in the projection 30 described above, the upper layer 31 spreads only forward from the peripheral edge 50c of the plate member 50 in plan view, while the lower layer 32 spreads from the peripheral edge 50c of the plate member 50. It is configured to extend to both the front and rear sides (see FIG. 3).

<Outsole>
The sole structure 10 comprises an outsole 60 (see Figures 1, 2 and 4). The outsole 60 is fixed to the lower side of the midsole 40 with an adhesive, for example, and arranged in layers. The outsole 60 is arranged in a range from the forefoot portion F to the rearfoot portion H in the sole structure 10 . The lower surface of the outsole 60 forms a first ground contact surface Sf2 at the mounting portion 20 and a second contact surface Sf3 at the projecting portion 30 .

The outsole 60 is composed of a plurality of members separated from each other in the front-rear direction. The outsole 60 is provided with a space 60a along the hollow portion 43a of the third midsole portion 43 from the middle foot portion M to the rear side portion H (see FIGS. 2 and 4).

The outsole 60 is made of a rigid elastic member having higher rigidity than the first to third midsole portions 41 to 43 . Specifically, the material of the outsole 60 includes thermoplastic synthetic resins such as ethylene-vinyl acetate copolymer (EVA), thermosetting resins such as polyurethane (PU), and rubbers such as butadiene rubber and chloroprene rubber. is suitable. The hardness of the outsole 60 is preferably set to durometer C or A, for example 50C to 80A (more preferably 60A to 70A).

≪Action and effect≫
FIG. 7 is a graph schematically showing how the reaction force (vertical axis) that a typical sole structure receives from the road surface changes with time (horizontal axis) during one contact. be. In FIG. 7, two types of time changes, a solid line and a dashed line, are shown. These two types have the same impulse (reaction force from the road surface × contact time), but the contact time is different. there is That is, the grounding time of the solid line is relatively short, and the grounding time of the one-dot chain line is relatively long. Comparing these two types of changes over time, it can be seen that the reaction force received from the road surface is smaller on average for the one-dot chain line with a relatively long ground contact time than the solid line with a relatively short ground contact time. . In addition, it can be seen that both of the two types of time changes have a first peak at which the reaction force reaches a maximum at ground contact and a second peak at which the reaction force subsequently reaches a maximum.

Here, in the present embodiment, the sole structure 10 has two ground contact surfaces, that is, the first ground contact surface Sf2 of the mounting portion 20 and the second contact surface Sf3 of the projecting portion 30, and thus has only the first contact surface Sf2. Compared to the case, the contact time with the road surface during running is longer. Then, as can be seen from FIG. 7, the reaction force received from the road surface is reduced on average as the contact time is longer. Specifically, according to the inventor's experiments and considerations, it was found that the second peak of the reaction force received from the road surface can be greatly reduced by providing the sole structure 10 with the projecting portion 30 . Further, it was found that the effect is particularly large when the area of the second ground plane Sf3 is 10% or more of the area of the first ground plane Sf2. As a result, the burden on the wearer's feet Ft during running can be reduced.

By the way, in order to reduce the reaction force that the sole receives from the road surface, it is conceivable to increase the cushioning property of the sole structure 10 . However, highly cushioned materials tend to be heavy. If the weight of the sole structure 10 increases in order to increase the cushioning properties, there is a problem that the burden on the wearer's feet Ft increases during running.

Here, in the present embodiment, the projecting portion 30 has a two-layer structure composed of an upper layer 31 having a relatively small weight and a lower layer 32 having a high cushioning property, thereby reducing the weight of the sole structure 10. I made it possible to secure cushioning. Moreover, since the upper layer 31 has higher rigidity than the lower layer 32, the sole can be stabilized during running. As a result, the burden on the wearer's feet Ft during running can be further reduced.

In addition, in the present embodiment, the length of the protruding portion 30 in the foot length direction is 30 mm or more, so that the effect of greatly reducing the second peak of the reaction force that the sole of the shoe wearer receives from the road surface is particularly enhanced. . As a result, the burden on the wearer's feet Ft can be further reduced.

Further, in the present embodiment, since the plate member 50 is arranged between the upper layer 31 and the lower layer 32 of the protrusion 30 and has higher rigidity than the upper layer 31 and the lower layer 32, the protrusion 30 is The shape can be reliably maintained, and the above-mentioned effect of prolonging the contact time with the road surface during running can be easily achieved. As a result, the burden on the wearer's feet Ft can be further reduced.

Further, in this embodiment, since the forefoot portion F has the rocker portion R, the movement of the wearer's foot Ft and the sole structure 10 with respect to the road surface before kicking off during running is controlled by the first ground contact surface Sf2 of the rocker portion R. It moves forward so that it follows the road surface. Then, the reaction force that the sole of the foot receives from the road surface before kicking out smoothly moves from the rear side of the forefoot portion F toward the front side. That is, it is possible to avoid a sudden change in the portion of the sole that receives the reaction force during running. In particular, the region where the rocker portion R is provided is within the range from the tip of the placing portion 20 to the position 25% behind the length of the placing portion 20 in the leg length direction in the leg length direction. Since the thickness of the sole structure 10 in the forefoot portion F is 20 mm or more, the effect is enhanced. As a result, the burden on the wearer's feet Ft can be further reduced.

Further, according to the inventor's experiments and considerations, when the sole structure 10 has the rocker portion R in the forefoot portion F, the first peak during running is lowered compared to when the rocker portion R is not included. I understood it. This is because wearing the shoe having the sole structure 10 having the rocker portion R changes the wearer's posture during running, and as a result, the way the foot Ft touches the ground changes so that the first peak is lowered. Conceivable.

In addition, in the present embodiment, the volume of the lower layer 32 of the projecting portion 30 is larger than the volume of the upper layer 31, so that the cushioning property of the sole structure 10 can be enhanced. As a result, the burden on the wearer's feet Ft can be further reduced.

Further, in this embodiment, the upper layer 31 extends only forward of the peripheral edge 50c of the plate member 50, while the lower layer 32 extends both forward and rearward of the peripheral edge 50c of the plate member 50. Due to the spread, the lower layer 32 is provided over a wider area than the upper layer 31 . Further, since the rear end portion of the plate member 50 disposed between the upper layer 31 and the lower layer 32 is the peak portion 50a, the lower layer 32 also has a peak portion below the rear end portion of the plate member 50. It becomes a shape along the portion 50a. With the above configuration, the volume of the lower layer 32 with high cushioning properties can be easily made larger than that of the upper layer 31 . That is, the cushioning property of the sole structure 10 can be enhanced. As a result, the burden on the wearer's feet Ft can be further reduced.

Further, in the present embodiment, since the hollow portion 43a is provided in the third midsole portion 43, the sole structure 10 can be lightened by the amount of the hollow portion 43a. As a result, the burden on the wearer's feet Ft can be further reduced.

In addition, in this embodiment, the volume of the lower layer 32 is 120% or more of the volume of the upper layer 31, so a large effect of absorbing the reaction force from the road surface can be obtained.

[Modification of First Embodiment]
In the first embodiment described above, the sole structure 10 includes the rear plate member 50 at the protrusion 30, but additionally or alternatively, the sole structure 10 is curved along the rocker portion R in side view. A front plate member (not shown) having higher rigidity than the midsole 40 (the mounting portion 20) may be provided in the forefoot portion F. For example, the front plate member may be arranged between the first midsole portion 41 and the second midsole portion 42 or may be arranged above the first midsole portion 41 .

As in this modification, if a front plate member curved along the rocker portion R and having higher rigidity than the mounting portion 20 (midsole 40) is provided at the position of the forefoot portion F, the front plate member provides the rocker. The shape of the portion R is stably maintained. Therefore, the wearer's foot Ft and the sole structure 10 can reliably rotate forward along the rocker portion R with respect to the road surface before kicking off during running. As a result, the burden on the wearer's feet Ft can be further reduced.

[Other embodiments related to the first embodiment]
The first ground contact surface Sf2 and the second ground contact surface Sf3 may not be flat as long as they are in contact with a flat road surface when a wearer of average body shape stands upright or runs. For example, the second ground contact surface Sf3 may be slightly curved upward toward the rear.

Sole structure 10 may comprise an insole positioned over midsole 40 . In that case, the upper surface of the insole constitutes the mounting surface Sf1.

Sole structure 10 may not include outsole 60 . In that case, the lower surface of the midsole 40 constitutes a first ground plane and a second ground plane.

At least one of the front plate member and the rear plate member 50 may be provided with a plate cavity penetrating vertically. For example, the rear plate member 50 may be provided with a plate cavity communicating with the cavity h of the third midsole. By providing the plate cavity, the sole structure 10 can be made lighter. As a result, the burden on the wearer's feet Ft can be further reduced.

[Second embodiment]
8-16 show a sole structure 10 according to a second embodiment of the disclosure. The sole structure 10 according to the second embodiment has a configuration for facilitating smooth contact with the ground by a runner (wearer) who is running at a slow pace, for example. The sole structure 10 according to the second embodiment will be specifically described below. In the following description, the same elements as in FIGS. 1 to 7 are given the same reference numerals. In addition, in FIG. 10, the skeletal structure of the wearer's foot is omitted for convenience of illustration.

As shown in FIGS. 8 to 14, the sole structure 10 according to the second embodiment includes a mounting portion 20 and a projecting portion 30. As shown in FIGS. The mounting portion 20 has a mounting surface Sf1 and a first ground surface Sf2. Note that the projecting portion 30 will be described later.

As shown in FIGS. 12 to 14, the sole structure 10 is provided with a rocker portion R. As shown in FIGS. Since the configuration of the rocker portion R is the same as that of the first embodiment, detailed description thereof will be omitted.

<Midsole>
As shown in FIGS. 8 and 9, sole structure 10 includes midsole 40 . As in the first embodiment, the upper surface of the midsole 40 constitutes the mounting surface Sf1. The thickness of the midsole 40 on the mounting surface Sf1 is, for example, 20 to 32 mm. In particular, from the viewpoint of enhancing the function of the rocker portion R, the thickness of the midsole 40 at the position corresponding to the forefoot portion F of the wearer's foot is 20 mm or more. In addition, the midsole 40 is provided with a peripheral portion 40a. An upper (not shown) is provided on the peripheral portion 40a.

As shown in FIGS. 8 to 16, the midsole 40 of the second embodiment is composed of a fourth midsole portion 44 and a fifth midsole portion 45 unlike the midsole 40 of the first embodiment. . The upper surface of the fourth midsole portion 44 is configured as a mounting surface Sf1. The fifth midsole portion 45 is layered under the fourth midsole portion 44 . The fifth midsole portion 45 is provided with a hollow portion 43a penetrating in its thickness direction (vertical direction) (see FIGS. 9 and 16).

Materials for the fourth midsole portion 44 and the fifth midsole portion 45 include, for example, thermoplastic synthetic resins such as ethylene-vinyl acetate copolymer (EVA), foams thereof, and thermosetting resins such as polyurethane (PU). and foams thereof, rubbers such as butadiene rubber and chloroprene rubber, and foams thereof are suitable. The fifth midsole portion 45 is made of a material having higher cushioning properties than the material of the fourth midsole portion 44 .

<Outsole>
As shown in FIGS. 8-16, the sole structure 10 includes an outsole 60. As shown in FIGS. The outsole 60 is arranged at a position corresponding to the range from the forefoot portion F to the rearfoot portion H of the wearer's foot in the sole structure 10 . The outsole 60 is layered under the midsole 40 . Specifically, the outsole 60 is layered under the fifth midsole portion 45 . A lower surface of the outsole 60 is configured as a first ground surface Sf2 and a second ground surface Sf3.

The outsole 60 is made of a hard elastic member having higher rigidity than the fourth midsole portion 44 and the fifth midsole portion 45 . Specifically, the material of the outsole 60 includes thermoplastic synthetic resins such as ethylene-vinyl acetate copolymer (EVA), thermosetting resins such as polyurethane (PU), and rubbers such as butadiene rubber and chloroprene rubber. is suitable. The hardness of the outsole 60 is preferably set to durometer C or A, for example 50C-80A. A more preferred hardness of the outsole 60 is 60A to 70A.

The outsole 60 is composed of a plurality of members separated from each other in the front-rear direction. Specifically, the outsole 60 of the second embodiment is composed of a first outsole portion 61 , a second outsole portion 62 and a third outsole portion 63 .

The first outsole portion 61 is mainly arranged in a region of the sole structure 10 corresponding to the forefoot portion F of the wearer's foot. The second outsole portion 62 is mainly arranged in a region corresponding to the rear foot portion H and the inner instep side of the wearer's foot in the sole structure 10 . The third outsole portion 63 is mainly arranged in a region corresponding to the rear foot portion H and the lateral instep side of the wearer's foot in the sole structure 10 .

The outsole 60 is configured such that a region corresponding to the rear foot portion H and the outer instep side of the wearer's foot has higher abrasion resistance than other regions. That is, the third outsole portion 63 has higher abrasion resistance than the first outsole portion 61 and the second outsole portion 62 . Specifically, in order to increase the wear resistance of the third outsole portion 63, the thickness of the third outsole portion 63 is greater than the thickness of each of the first outsole portion 61 and the second outsole portion 62. is configured to be For example, the thickness of each of the first outsole portion 61 and the second outsole portion 62 is set to 2.0 to 4.0 mm, while the thickness of the third outsole portion 63 is set to 4.0 to 7.0 mm. set.

<Front plate member>
As shown in FIGS. 10-15, the sole structure 10 includes a rigid front plate member 49. As shown in FIGS. The front plate member 49 is a member for increasing the flexural rigidity of the sole structure 10 over the forefoot portion F of the wearer's foot. The front plate member 49 is arranged in the sole structure 10 at a position corresponding to the forefoot portion F of the wearer's foot. The front plate member 49 is laminated between the fourth midsole portion 44 and the fifth midsole portion 45 . The front plate member 49 has a curved shape that follows the shape of the rocker portion R when viewed in cross section (see FIG. 14).

The front plate member 49 is configured as a thin layer having higher rigidity than the midsole 40 and the outsole 60 . The hardness of the front plate member 49 is set to 70A or more in durometer A. Examples of materials for the front plate member 49 include polyamide elastomer (PAE), thermoplastic polyurethane (TPU), and ethylene-vinyl acetate copolymer (EVA). In particular, if the material of the front plate member 49 is ethylene-vinyl acetate copolymer resin (EVA), it is possible to obtain the effects described later while suppressing the material cost.

<Rear side plate member>
As shown in FIGS. 10-14 and 16, the sole structure 10 includes a rigid rear plate member 50. As shown in FIGS. The rear plate member 50 is a member for increasing the rigidity of the range from the middle foot portion M to the rear foot portion H of the wearer's foot in the sole structure 10 . The rear plate member 50 is arranged in the sole structure 10 at positions corresponding to the midfoot portion M and the rearfoot portion H of the wearer's foot. The rear plate member 50 is laminated between the fourth midsole portion 44 and the fifth midsole portion 45 . The rear plate member 50 has a substantially wavy shape when viewed in cross section (see FIG. 14).

The rear plate member 50 is configured as a thin layer having higher rigidity than the midsole 40 and the outsole 60 . The rear plate member 50 is preferably made of hard elastic material. Examples of hard elastic materials include thermoplastic polyurethane (TPU), polyamide elastomer (PAE), thermoplastic resins such as ABS resins, thermosetting resins such as epoxy resins and unsaturated polyester resins, ethylene-vinyl acetate A polymeric resin (EVA) may be mentioned. A fiber reinforced plastic (FRP) using carbon fiber, aramid fiber, glass fiber, or the like as reinforcing fiber and thermosetting resin or thermoplastic resin as matrix resin may be used.

In the rear plate member 50 of this embodiment, the portion corresponding to the medial shell side has higher rigidity than the portion corresponding to the lateral shell side. Specifically, the rear plate member 50 is configured such that the portion located on the medial shell side has a multilayer structure (see FIG. 12). This multilayer structure increases the rigidity of the sole structure 10 at a position corresponding to the medial side. As a result, the wearer's foot does not fall toward the medial side when the shoe touches the ground. That is, the so-called overpronation is suppressed by the rear plate member 50 . As a result, it is possible to prevent the wearer's foot from being injured at the time of contact with the ground.

<Protrusion>
As shown in FIGS. 12 to 14, the projecting portion 30 has a second ground surface Sf3. The length of the protruding portion 30 in the leg length direction is 30 mm or more, as in the first embodiment. The projected road surface area of the second ground contact surface Sf3 is 10% or more of the projected road surface area of the first ground contact surface Sf2.

As shown in FIGS. 10 and 12-14, the protrusion 30 has an upper layer 31 and a lower layer 32. As shown in FIG. In the projecting portion 30 of the second embodiment, the rear portion of the fourth midsole portion 44 corresponds to the upper layer 31 , while the rear portion of the fifth midsole portion 45 corresponds to the lower layer 32 .

The lower layer 32 is arranged below the upper layer 31 as in the first embodiment. The lower layer 32 has a cushioning property higher than that of the upper layer 31 . The peripheral edge of the lower layer 32 is positioned rearward of the peripheral edge of the upper layer 31 in plan view. That is, the lower layer 32 is provided over a wider area than the upper layer 31 in plan view. Also, the volume of the lower layer 32 is larger than the volume of the upper layer 31 . For example, the volume of lower layer 32 is 120% or more of the volume of upper layer 31 .

As shown in FIGS. 9, 11, and 16, unlike the first embodiment, the projecting portion 30 of the second embodiment is divided in the foot width direction when viewed from the bottom. Specifically, the projecting portion 30 of the second embodiment is composed of a first projecting portion 33 and a second projecting portion 34, each of which is divided in the foot width direction.

The first projecting portion 33 and the second projecting portion 34 are spaced apart from each other in the foot width direction in bottom view. The first projecting portion 33 is arranged at a position corresponding to the medial side of the sole structure 10 . The first projecting portion 33 is continuous with a portion of the placing portion 20 located on the medial shell side. The second projecting portion 34 is arranged at a position corresponding to the outer shell side of the sole structure 10 . The second projecting portion 34 is continuous with a portion of the placing portion 20 located on the outer shell side.

[Characteristic configuration of the second embodiment]
As shown in FIGS. 12 and 13, the first ground contact surface Sf2 corresponds to the rear end portion 20a of the mounting portion 20 from a position A on the front side of the rear end portion 20a of the mounting portion 20 in a side view. It inclines toward the position away from the road surface Rs. The second ground contact surface Sf3 is continuous with the first ground contact surface Sf2 in a side view, and separates from the road surface Rs from a position corresponding to the rear end portion 20a of the mounting portion 20 toward the rear end portion of the projecting portion 30. are slanted and curved. In this embodiment, the position of the rear end portion 20a corresponds to the position corresponding to the rear end portion of the rear foot portion H of the wearer's foot in the sole structure 10 (see FIG. 10).

Here, in a side view, a line drawn perpendicularly (in a vertical direction) to the road surface Rs from the position of the rear end portion 20a of the mounting portion 20 is defined as a "perpendicular line L1". This perpendicular L1 is positioned at the boundary between the first ground plane Sf2 and the second ground plane Sf3 in a side view. A tangent line to the second ground plane Sf3 that passes through the intersection of the perpendicular line L1 and the second ground plane Sf3 is defined as a "tangent line L2." In this case, the angle θ between the road surface Rs and the tangent line L2 is preferably set within a range of 10° to 20°. More preferably, the angle θ is 15°. According to such setting, the effects described later can be obtained. In addition, in this embodiment, the second ground contact surface Sf3 is formed to have a gently curved shape when viewed from the side.

[Action and effect of the second embodiment]
As described above, the sole structure 10 according to the second embodiment is configured such that the projected road surface area of the second ground contact surface Sf3 is 10% or more of the projected road surface area of the first ground contact surface Sf2. With such a configuration, as in the first embodiment, the second peak (see FIG. 7) of the reaction force received from the road surface can be greatly reduced. In addition, in the sole structure 10 according to the second embodiment, the protruding portion 30 having the upper layer 31 and the lower layer 32 reduces the weight of the sole structure 10 and improves the cushioning properties, as in the first embodiment. can be secured. Furthermore, the upper layer 31 having higher rigidity than the lower layer 32 can reduce the burden on the wearer's feet while maintaining the stability of the wearer's soles during running.

Further, as a characteristic configuration of the sole structure 10 according to the second embodiment, the first ground contact surface Sf2 is positioned from a position A on the front side of the rear end portion 20a of the mounting portion 20 in a side view. It slopes and curves away from the road surface toward a position corresponding to the rear end 20a. The second ground contact surface Sf3 is continuous with the first ground contact surface Sf2 in a side view, and extends from a position corresponding to the rear end portion 20a of the mounting portion 20 toward the rear end portion of the projecting portion 30 so as to separate from the road surface. sloping and curved. That is, the length of the sole structure 10 contacting the road surface Rs in the X range is relatively long. As a result, it is possible to maintain the time during which the second contact surface Sf3 is in contact with the road surface Rs for a relatively long time, especially during running. As a result, it is possible to reduce the second peak (see FIG. 7) of the reaction force received from the road surface Rs. Therefore, the sole structure 10 according to the second embodiment can reduce the burden on the wearer's body (particularly on the feet) during running. Especially for a wearer running at a slow pace, the wearer's foot can be supported to promote smooth contact with the ground.

In order to obtain the above effects, it is preferable to set the angle θ between the road surface Rs and the tangent line L2 within a range of 10° to 20°. More preferably, the angle θ is 15°.

In addition, the projecting portion 30 includes a first projecting portion 33 located on the medial shell side and a second projecting portion 34 located on the lateral shell side, and the first projecting portion 33 and the second projecting portion 34 are They are spaced apart from each other in the foot width direction. According to this configuration, since the first projecting portion 33 and the second projecting portion 34 are separated in the foot width direction, even if the wearer's foot is biased toward the outer instep side or the inner instep side at the time of grounding, Even if there is, the cushioning properties of each of the first projecting portion 33 and the second projecting portion 34 make it easier for the wearer to maintain balance when the ground is on the ground. In particular, a wearer running at a slow pace can obtain a smooth running feeling while maintaining balance at the time of contact with the ground.

Here, the first projecting portion 33 and the second projecting portion 34 may be independent from each other, or may be separated by a groove. For example, the protrusion 30 of the present embodiment has a first protrusion 33 and a second protrusion 34 divided (independently) by a groove, and the groove extends from the protrusion to the forefoot through the heel bottom and middle foot. (see Figure 11). As a result, a smoother running feeling can be obtained without suppressing compressive deformation of the midsole when the load during running is transferred from the protruding portion 30 to the bottom of the heel, the middle foot, and the forefoot. Although FIG. 11 shows an example in which the groove continuously extends from the projecting portion 30 to the forefoot portion, the present invention is not limited to this. For example, the groove may extend to the midfoot or to the bottom of the heel.

In addition, the first ground contact surface Sf2 and the second ground contact surface Sf3 are formed by the lower surface of the outsole 60, and the outsole 60 is a region corresponding to the rear foot portion H and the outer instep side of the wearer's foot (the second contact surface Sf3). 3 outsole portion 63) is configured to have higher abrasion resistance than other regions other than this region. According to such a configuration, it is possible to appropriately protect the area corresponding to the rear foot portion H and the outer instep side of the foot when the ground touches the ground. Especially for a wearer running at a slow pace, there is a relatively high tendency for the area corresponding to the rear foot portion H and the outer instep side of the foot to rub against the road surface when the ground is touched. In particular, the abrasion resistance of the outer shell side region of the projecting portion 30 can be improved.

Further, the mounting portion 20 includes a midsole 40 and a front plate member 49 harder than the midsole 40. The front plate member 49 is attached to the front foot portion F of the wearer's foot of the mounting portion 20. placed in corresponding positions. A preferable hardness of the front plate member 49 is 70A or more in durometer A. According to such a configuration, it is possible to increase the flexural rigidity of the sole structure 10 at the position corresponding to the forefoot portion F of the wearer's foot. As a result, during running, the center of gravity tends to shift forward after the ground contact, and forward rolling can be encouraged.

Further, the mounting section 20 includes a midsole 40 and a rear plate member 50 that is harder than the midsole 40 , and the rear plate member 50 is a middle foot portion of the wearer's foot of the mounting section 20 . It is arranged in a range from a position corresponding to the part M to a position corresponding to the rear foot part H. According to such a configuration, it is possible to increase the flexural rigidity of the sole structure 10 at positions corresponding to the middle foot portion M and the rear foot portion H of the wearer's foot.

[Other embodiments related to the second embodiment]
Sole structure 10 may include an insole (not shown) disposed above fourth midsole portion 44 (midsole 40). In this case, the upper surface of the insole constitutes the mounting surface Sf1.

In the above-described second embodiment, the first ground contact surface Sf2 is tilted and curved away from the road surface from the position A toward the position corresponding to the rear end portion 20a in a side view. Not limited. For example, in a side view, the first ground contact surface Sf2 may be inclined straight away from the road surface from the position A toward the position corresponding to the rear end portion 20a.

In the above-described second embodiment, the second ground contact surface Sf3 is tilted and curved from a position corresponding to the rear end portion 20a toward the rear end portion of the projecting portion 30 so as to separate from the road surface in a side view. However, it is not limited to this form. For example, the second ground contact surface Sf3 may be inclined straight from the position corresponding to the rear end portion 20a toward the rear end portion of the projecting portion 30 so as to separate from the road surface in a side view.

In the second embodiment, the projection 30 includes the first projection 33 and the second projection 34, but is not limited to this embodiment. That is, the sole structure 10 according to the second embodiment includes a configuration in which the projecting portion 30 is not divided into a portion corresponding to the inner shell side and a portion corresponding to the outer shell side.

Moreover, although the form provided with the out sole 60 was shown in the said 2nd Embodiment, it is not restricted to this form. That is, the second embodiment includes a configuration without the outsole 60 . In this case, the lower surface of the fifth midsole portion 45 corresponds to the first ground plane Sf2 and the second ground plane Sf3.

Moreover, although the form provided with the front side plate member 49 and the rear side plate member 50 was shown in the said 2nd Embodiment, it is not restricted to this form. For example, the sole structure 10 according to the second embodiment includes a configuration including at least one of the front plate member 49 and the rear plate member 50 . Alternatively, the sole structure 10 according to the second embodiment includes a configuration in which both the front plate member 49 and the rear plate member 50 are not provided.

Further, in the second embodiment, the portion located on the medial shell side of the rear plate member 50 has a multilayer structure, but the present invention is not limited to this configuration. That is, the rear plate member 50 does not have to have the multi-layered structure.

INDUSTRIAL APPLICABILITY The present disclosure is industrially applicable as a sole structure for running shoes.

10: Sole structure Ft: Foot 20: Mounting part 20a: Rear end part of mounting part R: Rocker part 30: Protruding part 31: Upper layer 32: Lower layer 33: First protruding part 34: Second protruding part Sf1: Placement surface Sf2: First ground contact surface Sf3: Second ground contact surface 43a: Cavity portion 44: Fourth midsole portion 45: Fifth midsole portion 49: Front side plate member 50: Plate member (rear side plate member)
50a: peak portion 50b: valley portion 50c: peripheral edge portion of plate member 61: first outsole portion 62: second outsole portion 63: third outsole portion

Claims (15)

A shoe sole structure,
a placement portion having a placement surface on which the shoe wearer's foot is placed on the upper side, and a first ground contact surface that can be grounded on the road surface on the lower side;
a projecting portion projecting rearward from the rear end portion of the mounting portion and having a second ground contact surface on the lower side that can be grounded on the road surface,
The projected road surface area of the second ground contact surface is 10% or more of the projected road surface area of the first ground contact surface,
The projecting portion has an upper layer and a lower layer disposed below the upper layer and having higher cushioning properties than the upper layer.
sole structure. The sole structure according to claim 1,
The placing portion is a rocker portion curved in a side view so that the first ground contact surface gradually separates from the road surface and gradually faces forward from the rear side to the front side at the forefoot portion of the shoe wearer. has
The region in which the rocker portion is provided is within a range in the leg length direction from the tip of the placement portion to a position 25% behind the length of the placement portion in the leg length direction. ,
The thickness of the sole structure is 20 mm or more at the forefoot,
sole structure. The sole structure according to claim 2,
a front plate member disposed in or above the mounting portion at the position of the forefoot portion, curved along the rocker portion in a side view, and having higher rigidity than the mounting portion;
sole structure. In the sole structure according to any one of claims 1 to 3,
The sole structure, wherein the volume of the lower layer is greater than the volume of the upper layer. In the sole structure according to any one of claims 1 to 4,
Further comprising a rear plate member disposed between the upper layer and the lower layer in the protrusion, the rear plate member being stiffer than the upper layer and the lower layer;
sole structure. In the sole structure according to claim 5,
In a plan view, the upper layer of the projecting portion extends only to the front side of the peripheral edge of the rear plate member, while the lower layer extends to the front and rear of the peripheral edge of the rear plate member. spread on both sides,
The shape of the rear plate member is a wavy shape having crests and troughs in a side view,
Sole structure, wherein the rear end portion of the rear side plate member is the peak portion. In the sole structure according to any one of claims 1 to 6,
A sole structure, wherein at least one of the mounting portion and the protruding portion is provided with a hollow portion penetrating in a vertical direction. The sole structure according to claim 3,
a rear plate member disposed between the upper layer and the lower layer in the protrusion and having higher rigidity than the upper layer and the lower layer;
A sole structure, wherein at least one of the front plate member and the rear plate member is provided with a plate hollow portion penetrating vertically. In the sole structure according to any one of claims 1 to 8,
Sole structure, wherein the length of the protrusion in the foot length direction is 30 mm or more. The sole structure according to claim 1,
The first ground contact surface is inclined and/or separated from the road surface from a position on the front side of the rear end portion of the mounting portion toward a position corresponding to the rear end portion of the mounting portion in a side view. or curved,
The second ground contact surface is continuous with the first ground contact surface in a side view, and is separated from the road surface from a position corresponding to the rear end portion of the mounting portion toward the rear end portion of the protrusion. A sole structure that is sloping and/or curved. A sole structure according to claim 10, wherein
The protrusion is
a first projecting portion located on the medial shell side;
and a second projecting portion located on the outer shell side,
The sole structure, wherein the first projecting portion and the second projecting portion are spaced apart from each other in a foot width direction. A sole structure according to claim 10, wherein
I comprise out sole more,
The first ground contact surface and the second ground contact surface are configured by the lower surface of the outsole,
The outsole is constructed such that a region corresponding to the rear foot portion and outer instep side of the wearer's foot has higher abrasion resistance than other regions other than the region. A sole structure according to claim 10, wherein
The placing section is
a midsole;
a front plate member harder than the midsole,
The sole structure, wherein the front plate member is arranged at a position of the mounting portion corresponding to a forefoot portion of a wearer's foot. 14. The sole structure of claim 13, wherein
The sole structure, wherein the hardness of the front plate member is set to 70A or more in durometer A. A sole structure according to claim 10, wherein
The placing section is
a midsole;
a rear plate member harder than the midsole,
The sole structure, wherein the rear plate member is arranged in a range from a position corresponding to the middle foot portion of the foot of the wearer to a position corresponding to the rear foot portion of the mounting portion.

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