JP4043450B2 - Sole structure of sports shoes - Google Patents

Description

  The present invention relates to a sports shoe, particularly a sole structure of a running shoe, and more particularly to a simple structure that improves a ride feeling during running.

  In general, functions required for running shoes include impact relaxation, heel stability, fit, grip and torsional rigidity, and various improvements have been made so far in order to enhance these functions.

  On the other hand, for a wearer who actually wears shoes, the feeling of wearing the shoes is evaluated based on the riding comfort or running comfort that should be called “ride feeling” during actual running. This "ride feeling" is determined by integrating information received by the wearer from various sensory organs during driving, and the criteria for evaluation is simply that the shock-relaxing property is excellent or that the heel stability is simply Up to now, it has been thought that it is not a single thing that is excellent, but a composite thing that combines various functions of shoes.

  The inventors of the present invention have conducted various studies so far to find out the true nature of such “ride feeling”, and as a result, have come to discover the factors that act on “ride feeling”.

  The problem to be solved by the present invention is to improve the ride feeling during traveling with a simple structure.

  In order to consider the force acting on the foot of the wearer of the running shoe from the kinematic point of view, the inventors according to the present invention, as shown in FIG. 1 (b), show the tibia above the wearer's ankle joint. The accelerometer Ac was affixed to the wearer, and the temporal change in the longitudinal acceleration acting on the wearer's foot while running was measured.

  The measurement results are shown in FIG. The horizontal axis in the figure shows time, and corresponds to the change in the landing state of the foot shown in each figure in FIG. The vertical axis in FIG. 1 (a) indicates acceleration, and acceleration in the rearward direction of travel is indicated above the origin of the vertical axis, and acceleration forward in the direction of travel is indicated below from the origin of the vertical axis. Moreover, the result about three types of shoes of (i)-(iii) is shown by the same figure.

  As shown in Fig. 1 (a), in a series of gait cycles from touching down to shifting to ground, acceleration in the back and front alternately acts repeatedly on the running foot. (See the arrow in FIG. 1 (b)). As shown in the center diagram in FIG. 1B, the peak value of the acceleration in the front-rear direction in the situation where the heel is flat (that is, the situation where the entire surface of the heel is grounded) is shown by the white arrow in FIG. Is shown. This value was different depending on the shoes, and the shoes of (i) were lower than the shoes of (ii) and (iii).

  The inventors of the present invention focused on such a peak value of acceleration in the longitudinal direction. Further experiments were conducted on shoes having various sole structures, and the ride feeling felt by the wearer during running was evaluated for each shoe. Since this feeling of riding is a sensory value that the wearer feels during running, the feeling of riding for each shoe can be relatively evaluated by, for example, performing a five-step evaluation. The results are plotted in FIG.

  In FIG. 2, the vertical axis represents the ride feeling, and the horizontal axis represents the peak value of acceleration in the front-rear direction. In the figure, a regression line obtained from each data plotted in the figure is entered. As can be seen from FIG. 2, the ride feeling decreases as the peak value of acceleration in the front-rear direction increases, and conversely, the ride feeling improves as the peak value of acceleration in the front-rear direction decreases. In other words, it can be said that the “swing” in the front-rear direction of the running foot is closely related to the ride feeling.

  Next, the inventors according to the present invention determined temporal changes in the front-rear direction force Fy and the vertical direction force Fz (see FIG. 3) acting on the shoes when landing. FIG. 4 is a graph showing the results. The upper graph in FIG. 4 shows the temporal change (force curve) for the force Fy, and the lower graph in the figure shows the temporal change (force curve) for the force Fz.

  As can be seen from FIG. 4, the Fy force curve also has a peak in the phase of the first peak Pf of the Fz force curve. Therefore, when both of these peaks, the ground reaction force Fyz (see FIG. 3), which is the resultant force, takes the maximum value. Assuming that the angle formed by the force Fyz and the forward direction of Fy is θ (see FIG. 3), θ is found to be θ≈70 °.

  On the other hand, it was observed that the acceleration Az in the vertical direction was maximized in almost the same phase as the phase where the ground reaction force Fyz was maximized. At this time, when the angle formed by the combined acceleration Ayz with the longitudinal acceleration Ay and the Ay direction is α (see FIG. 5), α≈70 °, and its standard deviation is about 10 °.

  In view of the above, the inventors of the present invention can effectively reduce the acceleration Ayz to the foot and effectively reduce the acceleration of the ground if the ground reaction force Fyz acting on the shoe can be effectively reduced. It was thought that the ride feeling of can be improved.

  The present invention has been made from such a viewpoint, and plate-like members as pressure receiving members are arranged in a direction perpendicular to the direction of action of the ground reaction force Fyz, that is, in a direction perpendicular to the direction of action of the impact acceleration Ayz. This is the main feature.

The sole structure of the sports shoe according to the invention of claim 1 is provided with a sole main body made of a soft elastic member provided at least on the heel portion of the shoe, and the sole main body, the front end side of which is positioned above the rear end side. And a plate-like member disposed obliquely as viewed from the side of the shoe. The plate-like member has a center at a position at a distance of 17% of the foot length from the rear end of the shoe on the shoe heel center line on the sole contact surface of the sole body and has a length of 8% of the foot length. a circular region having a radius, so that the center is moved from the center while along the vertical cross section including the parallel line segments and a last center line in the moving direction forming an 7 0 degrees relative to the front of the line segment, sole It exists in the projection area when projected toward the inside of the main body. The plate-like member has an inclination angle of 10 degrees upward or downward with respect to a virtual plane orthogonal to the vertical cross section including the line segment and forming an inclination angle of 20 degrees with the surface on the sole contact side. The inclination is set so as to be arranged between the virtual planes.

  According to the first aspect of the present invention, the plate-like member is provided in a direction orthogonal to the direction of 70 degrees with the sole contact surface of the sole body or in a direction of ± 10 degrees with this orthogonal direction (see FIG. 3), the plate-like member is disposed in a direction substantially orthogonal to the above-described direction of the ground reaction force Fyz, that is, in a direction substantially orthogonal to the direction of the impact acceleration Ayz. The ground reaction force Fyz can be effectively dispersed to reduce the acceleration Ayz effectively, and as a result, the ride feeling of the shoe wearer can be improved.

  In the invention of claim 2, the circular region is determined based on the foot pressure distribution state at the time of landing on the heel.

  As described in the inventions of claims 3 to 5, the plate-like member may be any member of a disk shape, an elliptical plate shape, or a rectangular plate shape.

  As described in the invention of claim 6, the plate-like member may be extended to the inner and outer surfaces of the sole body.

As described in the invention of claim 7, the plate-like member may have curved portions at the front and rear ends in the sole body.

  In the invention of claim 8, the plate-like member is composed of a hard elastic member having a hardness higher than that of the sole body.

  In the invention of claim 9, the sole body has an upper and lower two-layer structure, and the plate-like member is disposed between the interfaces of these two-layer structures.

  In the invention of claim 10, the sole body has an upper and lower two-layer structure, and the plate-like member is composed of an adhesive layer applied to the interface of these two-layer structures. In this case, the cured adhesive layer can function as a plate member.

  In the eleventh aspect of the invention, the sole body has an upper and lower two-layer structure, and the plate-like member is composed of a fabric interposed at the interface of these two-layer structures and an adhesive layer applied to the interface. . In this case, the cured adhesive layer can function as a plate member together with the fabric.

  In the invention of claim 12, a cushion hole that allows the plate-like member to be deformed downward is formed below the plate-like member inside the sole body. In this case, the cushion hole facilitates the downward deformation of the plate-like member, whereby the ground reaction force Fyz can be more effectively distributed.

  In the invention of claim 13, in the invention of claim 1, the bending rigidity of the plate-like member gradually decreases from the rear end side to the center portion or the front end side. According to the first aspect of the present invention, the plate-like member is disposed in a direction substantially perpendicular to the direction in which the ground reaction force Fyz is applied, so that the plate-like member is inclined obliquely upward, that is, in the upward direction of the toes. However, in the invention of claim 11, since the front end side of the plate-like member is more easily deformed than the rear end side, the load can be moved forward smoothly when the ground reaction force Fyz is applied. It becomes like this.

  In the invention of claim 14, the bending rigidity of the plate-like member gradually decreases from the rear end side and front end side to the center portion in the front-rear direction. In this case, the central portion of the plate-like portion is more easily bent than the front and rear end portions, whereby the ground reaction force Fyz can be effectively absorbed and relaxed at the central portion of the plate-like portion.

  In a fifteenth aspect of the present invention, the plate-like member is connected to a plate having a corrugated portion disposed inside the sole body. In this case, running stability can be improved by the plate, the ground reaction force Fyz can be effectively dispersed, the acceleration Ayz can be effectively reduced, and the rider's ride feeling can be improved.

  According to the sole structure according to the present invention, the plate-like member is provided in a direction substantially perpendicular to the direction of the ground reaction force Fyz. Therefore, the ground reaction force Fyz is effectively dispersed and the acceleration Ayz is effective. As a result, the ride feeling of the shoe wearer can be improved.

  6 and 7 are views for explaining the basic structure of the sole structure according to the present invention, in which FIG. 6 is a plan view of the sole structure, FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. It is a figure for demonstrating the area | region where a plate-shaped member is provided.

  As shown in FIGS. 6 and 7, the sole structure includes a sole body S made of a soft elastic member extending from the heel portion of the shoe to the forefoot portion, and a plate-like member 10 provided therein. I have. The plate-like member 10 is disposed obliquely, that is, in a toe-up direction as viewed from the side of the shoe so that the front end side is positioned above the rear end side.

  The sole body S has a surface Sa on the sole contact side and a surface Sb on the ground contact side, and has a thickness t. The sole body S is, for example, a thermoplastic synthetic resin foam such as ethylene-vinyl acetate copolymer (EVA), a thermosetting resin foam such as polyurethane (PU), or a rubber material such as butadiene rubber or chloroprene rubber. Or a cushioning material such as rubber or elastomer (for example, PAE).

  In FIG. 6, L indicates the foot length (that is, the size of the wearer's foot), which is the length measured along the last center line C. ΔL is a rounded dimension (that is, a dimension portion that causes play of the foot in the shoe), and is usually set to about 5 to 10 mm. Co is the heel center line.

  A circular area H illustrated on the surface Sa on the sole contact side in the sole body S is a foot contact area. The circular region H has a center O at a position e of 17% of the foot length L from the heel rear end E on the heel center line Co on the foot contact side surface Sa, and the foot length L is 8%. A region surrounded by a circle having a radius r of% length. For example, when the foot length L is 270 mm, e = 0.17 × L = 45.9 mm and r = 0.08 × L = 21.6 mm. The circular area H substantially coincides with the area determined based on the foot pressure distribution state at the time of landing on the heel. In FIG. 6, Cp is a line segment passing through the center O and parallel to the last center line C.

  Next, the circular region H is moved in a direction that forms 70 degrees forward with respect to the surface Sa on the sole contact side, along the vertical section passing through the line segment Cp in which the center O is parallel to the last center line C. Thus, it projects toward the inside of the sole body S (see FIG. 7). The projection area at this time is shown by the area of the parallelogram ABCD in the lower diagram in FIG. The plate-like member 10 is, for example, a disc-like, elliptical, or rectangular member that exists in this parallelogram region.

  As shown in FIG. 7, an imaginary plane P extending in the direction perpendicular to the sheet of the figure, perpendicular to the vertical section passing through the line segment Cp and having an inclination angle of 20 ° with the surface Sa on the sole contact side, is parallel to the four sides. Assuming shape area. The inclination of the plate member 10 is set so as to be disposed between the virtual planes Pu and Pd each having an inclination angle of 10 ° above or below the virtual plane P.

  The plate member 10 is preferably composed of a hard elastic member having a hardness higher than that of the sole body S. For example, thermoplastic resin such as polyurethane, polyamide elastomer (PAE), ABS resin, epoxy resin, polyester resin, or the like. Or other polymer compounds such as hard synthetic rubber and synthetic fiber.

  In this case, a direction orthogonal to the direction forming 70 degrees with the sole Sa on the sole contact side of the sole body S (that is, the direction in which the virtual plane P is disposed) or a direction forming ± 10 degrees with this orthogonal direction (virtual) Since the plate-like member 10 is disposed in the planes Pu and Pd), the direction substantially perpendicular to the direction of action of the ground reaction force Fyz described with reference to FIG. 3, that is, substantially perpendicular to the direction of action of the impact acceleration Ayz. The plate-like member 10 is disposed in the direction, whereby the ground reaction force Fyz can be effectively dispersed and the acceleration Ayz can be effectively reduced. As a result, the feeling of riding of the shoe wearer can be improved.

[Other examples]
8A and 8B are longitudinal sectional partial views of a sole structure according to another embodiment of the present invention, in which FIG. 8A is a longitudinal section passing through the heel center line Co, and FIG. 8B is a last center line passing through the center O. A longitudinal section passing through a line segment Cp parallel to C is shown. FIGS. 9 to 14 show first to sixth modifications of the other embodiments, all corresponding to FIG. 8B. This sole structure is different from the above embodiment in that a winding part Su is formed around the heel part of the sole body S.

  In this case, since the winding portion Su is also formed at the rear end portion of the heel, the position of the heel rear end E is unclear. However, as shown in FIG. 8A, in a longitudinal section passing through the heel center line Co. The intersection of the approximate line Su ′ of the heel contact surface in the sole body at the heel end portion of the heel rear end and the approximate line Sa ′ of the surface Sa on the sole contact side into the sole body In the present specification, it is defined as the rear end E of the sole structure having such a winding portion.

  In FIG. 9 showing the first modification, a cushion hole 15 is formed below the plate member 10 inside the sole body S. In this case, the downward deformation of the plate-like member 10 is facilitated by the cushion hole 15, whereby the ground reaction force Fyz can be more effectively distributed.

  The shape of the cushion hole 15 is not limited to that shown in FIG. 9, and as shown in the second modification of FIG. 10, the size of the hole 15 ′ gradually increases as it goes forward. It may be. In this case, since the front end side of the plate-like member 10 is more easily bent downward than the rear end side, the load can be moved forward smoothly when the ground reaction force Fyz is applied. Further, the bending of the plate member 10 may be adjusted by filling the cushion hole 15 with a soft member such as sponge.

  In FIG. 11 showing the third modification, a thick portion 10a is formed on the rear end side of the plate-like member 10, and the thickness of the plate-like member 10 gradually increases from the rear end side to the center portion or the front end side. It is thin. Thereby, the bending rigidity of the plate-like member 10 gradually decreases from the rear end side to the center portion or the front end side, and the front end side of the plate-like member 10 is more easily bent. As a result, when the ground reaction force Fyz is applied, the load can be moved forward smoothly.

  In addition, as a method of changing the bending rigidity of the plate-like member 10, in addition to changing the thickness of the entire plate-like member 10, a rib is partially provided to form a highly rigid portion, or a hole is formed. For example, a low-rigidity part may be configured.

  In FIG. 12 showing the fourth modification, thick portions 10a and 10b are formed on the rear end side and the front end side of the plate-like member 10, respectively, and the thickness of the plate-like member 10 is the rear end side and the front end. It gradually becomes thinner from the side to the center. Thereby, the bending rigidity of the plate-shaped member 10 is small in the central portion, and the central portion is more easily bent. As a result, when the ground reaction force Fyz is applied, the ground reaction force Fyz can be effectively absorbed and relaxed at the center of the plate-like portion. In this case, since the cushion hole 15 is formed, the downward deformation of the central portion of the plate-like member 10 is more easily performed.

In FIG. 13 showing a fifth modification of, and has a vertical two-layer structure sole body S consists of an upper sole body S ₁ and a lower sole body S _2. The plate-like member 10 is composed of an adhesive layer applied to the interfaces S ₁ b and S ₂ a of these two-layer structures. This adhesive layer is applied thicker than the adhesive layer applied to other parts of the same interface. In this case, the cured adhesive layer can function as a plate member.

  In the fifth modification, fabrics may be interposed at the interface between the upper and lower two-layer structures, and the interfaces may be bonded via the fabric. In this case, the cured adhesive layer can function as a plate member together with the fabric. Examples of the fabric include knitted fabric, woven fabric, non-woven fabric, aramid fiber, carbon fiber, glass fiber, metal fiber, and liquid crystal fiber. Further, instead of the thickly applied adhesive layer, the plate-shaped member 10 of the resin molded product described in the above embodiment may be disposed at the interface of the upper and lower two-layer structure.

  You may make it extend in the front-and-rear end of the plate-shaped member 10 as shown in FIG. 14 which is a 6th modification slightly curved part 10b. In addition, as a shape extended in the front-and-rear end of the plate-shaped member 10, it is not limited to such a curved shape, Arbitrary shapes are employable. Moreover, a larger area is preferable in that the entire plate-like member can be greatly bent.

  In the above-described embodiment, the plate-like member 10 is described as an example of a disc-like, elliptical-plate, or rectangular plate-like shape, but the application of the present invention is not limited to this. Any other shape can be adopted as long as it has a planar shape including the circular region H. Further, the plate 10 may extend to the inner and outer surfaces of the sole S.

  Moreover, in the said Example, although the plate 10 was independently provided in the sole S, application of this invention is not limited to this. A corrugated plate having a corrugated portion may be provided in the sole S, and the plate 10 may be coupled to the corrugated plate.

(A) is a graph which shows the time change of the acceleration of the front-back direction which acts on a shoe | wearing wearer's leg | foot during driving | running | working, (b) is a figure which shows the change of the landing state of a leg | foot. It is a graph which shows the correlation of the acceleration of a front-back direction and the ride feeling which a wearer feels. It is a figure for demonstrating the force of the front-back direction which acts on shoes at the time of landing, the force of a perpendicular direction, and ground reaction force. It is a graph which shows the time change of the force of the front-back direction and the force of a perpendicular direction. It is a figure for demonstrating the acceleration of the front-back direction which acts on a leg | foot at the time of landing, and the acceleration of a perpendicular direction. It is a top view of the sole structure by one Example of this invention. FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. 6, illustrating a region where a plate-like member is provided. It is a longitudinal cross-sectional partial view of the sole structure by other Examples of this invention, Comprising: It is a longitudinal cross-sectional view which passes along the heel centerline Co. FIG. FIG. 6 is a longitudinal sectional partial view of a sole structure according to another embodiment of the present invention, which is a longitudinal sectional view passing through a center O and passing through a line segment Cp parallel to the last center line C. It is a figure which shows the 1st modification of the said other Example, Comprising: It respond | corresponds to FIG. 8B. It is a figure which shows the 2nd modification of the said other Example, Comprising: It respond | corresponds to FIG. 8B. It is a figure which shows the 3rd modification of the said other Example, Comprising: It corresponds to FIG. 8B. It is a figure which shows the 4th modification of the said other Example, Comprising: It corresponds to FIG. 8B. It is a figure which shows the 5th modification of the said other Example, Comprising: It respond | corresponds to FIG. 8B. It is a figure which shows the 6th modification of the said other Example, Comprising: It corresponds to FIG. 8B.

Explanation of symbols

10: Plate member

S: sole body Sa: foot contact side E: heel rear end L: foot length Co: heel center line Cp: line segment O: center r: radius H: circular area P: virtual plane Pu, Pd: virtual Plane

Claims (15)

A sole structure for sports shoes,
A sole body (S) made of a soft elastic member provided at least on the heel of the shoe;
A plate-like member (10) provided on the sole body (S) and disposed obliquely when viewed from the side of the shoe so that the front end side is located above the rear end side,
The plate-like member (10)
On the sole contact surface (Sa) of the sole body (S), on the heel center line (Co) of the shoe, at a position (e) of 17% of the foot length (L) from the heel rear end (E). A circular region (H) having a center (O) and a radius (r) of 8% of the foot length (L) is represented by a line segment with the center (O) parallel to the last center line (C) ( from while along the vertical cross section including the cp) center (O) so as to move in the moving direction forming an 7 0 degrees with respect to the front of the line segment (Cp), and projected toward the inside of the sole body (S) Exist in the projected area of time,
An inclination angle of 10 degrees upward or downward with respect to a virtual plane (P) perpendicular to the vertical section including the line segment (Cp) and forming an inclination angle of 20 degrees with the surface (Sa) on the sole contact side The inclination of the plate member (10) is set so as to be arranged between virtual planes (Pu, Pd) having
A sole structure of sports shoes characterized by that. In claim 1,
The circular area (H) is determined based on the foot pressure distribution state at the time of landing on the heel.
A sole structure of sports shoes characterized by that. In claim 1,
The plate-shaped member (10) is a disk-shaped member.
A sole structure of sports shoes characterized by that. In claim 1,
The plate member (10) is an elliptical plate member,
A sole structure of sports shoes characterized by that. In claim 1,
The plate member (10) is a rectangular plate member,
A sole structure of sports shoes characterized by that. In claim 1,
The plate-like member (10) extends to the inner and outer surfaces of the sole body (S).
A sole structure of sports shoes characterized by that. In claim 1,
The plate-like member (10) has curved portions at the front and rear ends in the sole body (S).
A sole structure of sports shoes characterized by that. In claim 1,
The plate-like member (10) is composed of a hard elastic member having a higher hardness than the sole body (S).
A sole structure of sports shoes characterized by that. In claim 1,
The sole body (S) has an upper and lower two-layer structure, and a plate-like member (10) is disposed between the interfaces of these two-layer structures.
A sole structure of sports shoes characterized by that. In claim 1,
The sole body (S) has an upper and lower two-layer structure, and the plate member (10) is composed of an adhesive layer applied to the interface of these two-layer structures.
A sole structure of sports shoes characterized by that. In claim 1,
The sole body (S) has an upper and lower two-layer structure, and the plate-like member (10) is composed of a fabric interposed at the interface of these two-layer structures and an adhesive layer applied to the interface.
A sole structure of sports shoes characterized by that. In claim 1,
Inside the sole body (S), a cushion hole is formed below the plate member (10) to allow the plate member (10) to be deformed downward.
A sole structure of sports shoes characterized by that. In claim 1,
The bending rigidity of the plate-like member (10) is gradually reduced from the rear end side to the central portion or the front end side.
A sole structure of sports shoes characterized by that. In claim 1,
The bending rigidity of the plate-like member (10) is gradually reduced from the rear end side and the front end side to the center portion in the front-rear direction.
A sole structure of sports shoes characterized by that. In claim 1,
The plate-like member (10) is connected to a plate having a corrugated portion disposed inside the sole body (S).
A sole structure of sports shoes characterized by that.

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