JP7215027B2 - golf club head - Google Patents

Description

The present invention relates to golf club heads.

In order to increase the flight distance of a hit ball, there is a demand for a golf club head with a low center of gravity. Lowering the center of gravity brings the sweet spot of the face closer to the face center (near the actual hitting point), thereby increasing the launch angle of the hit ball and reducing the spin rate. Therefore, lowering the center of gravity of the golf club head increases the flight distance of the hit ball.

Patent Document 1 below discloses a golf club head comprising a crown portion, a face portion, a sole portion having at least one opening, and at least one weight member attached to the opening of the sole portion. ing.

JP 2016-10579 A

By the way, when a large weight such as a weight member is placed in the sole portion of the golf club head, the vicinity of the center of the sole portion flexes greatly when the ball is hit, and the impact sound becomes low. In general, many golfers tend to prefer a high-pitched sound, and thus golf club heads with a low-pitched sound impair the feel of many golfers.

SUMMARY OF THE INVENTION The present invention has been devised in view of the problems described above, and its main object is to provide a golf club head capable of producing a high-pitched hitting sound while achieving a low center of gravity.

A first aspect of the invention is a golf club head having a hollow portion therein, including a face portion, a crown portion and a sole portion, the sole portion including a sole bottom portion and a skirt portion, the skirt portion comprising the above-described golf club head. The area extending from the sole contour toward the center of the head up to 15% of the length in the toe-heel direction of the head in a standard state in which the head is placed on a horizontal plane with a specified lie angle and loft angle when viewed from the bottom of the head. , the sole bottom portion includes a heavy weight made of a material having a higher specific gravity than that of the sole bottom, and a thick wall extending from the periphery of the heavy weight in at least two directions of the toe side, the heel side and the back side of the skirt portion. and a reinforcing portion, the reinforcing portion connecting at least three points around the weight to the skirt portion.

A second aspect of the invention is a golf club head having a hollow portion therein, comprising a face portion, a crown portion and a sole portion, the sole portion including a sole bottom portion and a skirt portion, the skirt portion In the bottom view of the head in the standard state where the head is placed on a horizontal plane with a specified lie angle and loft angle, the area extending from the outer peripheral contour line of the head toward the center of the head up to 15% of the length in the toe-heel direction of the head. The sole bottom portion has a high weight portion thicker than other portions of the sole bottom portion, and at least two portions on the toe side, the heel side, and the back side of the skirt portion from the periphery of the high weight portion. and a thick reinforcement section extending in a direction, the reinforcement section connecting the skirt section to the skirt section at least three points around the heavy section.

In another aspect of the first invention and the second invention (hereinafter sometimes collectively referred to as "the present invention"), a vertical cross section along the toe-heel direction passing through the center of gravity of the head in the reference state In the above, the radius of curvature of the bottom surface of the sole may be larger than the radius of curvature of the skirt portion.

In another aspect of the present invention, the reinforcing portion can extend in three directions of the toe side, heel side and back side of the skirt portion.

In another aspect of the present invention, the sole bottom portion is provided with a thick enclosing portion surrounding the weight, and the reinforcing portion may extend from the enclosing portion to the skirt portion.

In another aspect of the present invention, the heavy object has a quadrangular shape in a plan view of the head, and the reinforcing portion may extend from three or more corners of the quadrangular shape to the skirt portion.

In another aspect of the invention, the reinforcing portion may overlap the skirt portion by 3 mm or more.

In another aspect of the invention, the reinforcing portion may terminate within the skirt portion without reaching the location of the sole contour.

In another aspect of the present invention, the width of the reinforcing portion may be greater than the height of the reinforcing portion in a cross section perpendicular to the extending direction of the reinforcing portion.

In the golf club head of the present invention, the sole bottom portion is provided with a heavy weight made of a material having a higher specific gravity than that of the sole bottom portion, or a heavy weight portion thicker than other portions of the sole bottom portion. there is Therefore, the golf club head of the present invention can achieve a low center of gravity.

As a result of various analyzes by the inventors, the skirt portion, which is an area extending from the sole contour toward the center of the head to 15% of the length in the toe-heel direction of the head when viewed from the bottom of the head, was found to be less than the sole. It was found to have a higher stiffness than the bottom. The inventors paid attention to such characteristics of the skirt portion, and found that at least two of the toe side, heel side, and back side of the skirt portion from the periphery of the heavy object (or the heavy weight portion, the same applies hereinafter). A thick reinforcing portion extending in one direction is provided, and the reinforcing portion connects at least three points around the heavy object to the skirt portion. If there are two connection points, the heavy object is likely to move in a rotating direction about a straight line connecting the connection points (two positions). On the other hand, according to the present invention, by providing three or more connection points, it is possible to suppress the movement of the heavy object as described above. As a result, the golf club head of the present invention can significantly suppress the vibration of the bottom portion of the sole on which the heavy object is provided when hitting a ball, and thus can provide a high-pitched hitting sound.

1 is a perspective view of a golf club head according to one embodiment of the first invention; FIG. FIG. 2 is a plan view of FIG. 1; 3 is a cross-sectional view taken along line III-III of FIG. 2; FIG. 1 is an exploded perspective view of the golf club head of the present embodiment before assembly; FIG. 4 is a cross-sectional view of the golf club head corresponding to the position of line VV in FIG. 3; FIG. (A) and (B) are a front view and a bottom view of a golf club head for explaining a sole bottom portion and a skirt portion. FIG. 6 is a cross-sectional view taken along line VII-VII of FIG. 5; (A) and (B) are cross-sectional views of the golf club head for explaining modifications of the reinforcing portion. FIG. 10 is an exploded perspective view of the golf club head before assembly according to one embodiment of the second invention; FIG. 4 is a cross-sectional view of a golf club head according to one embodiment of the second invention; FIG. 4 is a cross-sectional view showing the structure of a sole portion of a head of a comparative example; (A) and (B) are contour diagrams showing vibration analysis simulation results of a comparative example and an example. It is a graph which shows the relationship between the frequency and the sound pressure level in the vibration analysis simulation of a comparative example and an example. 7 is a graph showing octave analysis results of hitting sounds of comparative examples and examples.

An embodiment of the golf club head of the present invention will be described below with reference to the drawings. The embodiments detailed below and the specific configurations shown in the drawings are for understanding the content of the present invention, and the present invention is not limited to those specific configurations. do not have. Also, in the following description, the same or common elements are denoted by the same reference numerals, and overlapping descriptions are omitted.

[First invention]
1 to 5 are a perspective view, a plan view, a cross-sectional view taken along line III-III in FIG. 4A and 4B show cross-sectional views corresponding to one line of VV in FIG. 3, respectively. 1 to 3 depict the head 1 in a reference state.

[Head reference condition]
The reference state of the head 1 is a state in which the head 1 is maintained at the loft angle α (FIG. 3) and the lie angle (not shown) with respect to the horizontal plane HP. In the reference state, as shown in FIG. 2, the shaft axis centerline CL of the head 1 is arranged within an arbitrary vertical plane VP. A horizontal direction y along the vertical plane VP is the toe-heel direction of the head 1, and a horizontal direction x perpendicular to the vertical plane VP is the head front-rear direction. In some cases, the front side of the head 1 is referred to as the "face side" and the "rear side" of the head 1 is referred to as the back side. Also, the direction z orthogonal to both x and y is defined as the vertical direction of the head. Unless otherwise mentioned, the head 1 should be understood as being placed in a reference state.

[Basic configuration of the head]
1 to 5, the head 1 of this embodiment has a hollow portion i (shown in FIG. 3) inside, and is configured, for example, as a typical wood type. The wood type head includes at least a brassie (#2), a spoon (#3), a buffy (#4) and a creek (#5), as well as a driver (#1). Also, the head 1 of the present embodiment includes heads having substantially similar shapes to those listed above, even if the numbers or names are different. In other embodiments of the invention, the head 1 may, for example, be configured as a utility type.

The head 1 of this embodiment includes, for example, a face portion 2, a crown portion 3 and a sole portion 4, and further includes a weight 10. As shown in FIG. A hollow portion i inside the head is defined by the face portion 2 , the crown portion 3 and the sole portion 4 .

The front surface of the face portion 2 functions as a face 2a, which is a hitting surface for hitting a ball.

The crown portion 3 continues to the face portion 2 and constitutes the upper surface of the head.

The sole portion 4 continues to the face portion 2 and constitutes the bottom side of the head. 6A and 6B show a front view and a bottom view of the head 1 in a reference state. As shown in FIGS. 6A and 6B, the sole portion 4 includes a sole bottom portion 4a and a skirt portion 4b.

The sole bottom portion 4a constitutes a lower portion (a portion near the horizontal plane HP) of the sole portion 4, and is composed of a flat surface or a curved surface with a relatively large radius of curvature. On the other hand, the skirt portion 4 b constitutes a high portion of the sole portion 4 . The skirt portion 4b is a portion that connects the sole bottom portion 4a to the crown portion 3, and is formed of a curved surface with a radius of curvature smaller than that of the sole bottom portion 4a. Due to this structural difference, the skirt portion 4b generally has a higher flexural rigidity than the sole bottom portion 4a.

In this specification, as shown in FIG. 6B, the skirt portion 4b extends from the sole contour line E toward the center of the head by 15% of the length L1 in the toe-heel direction of the head 1 when viewed from the bottom of the head. defined as region A up to The sole bottom portion 4a is defined as a portion obtained by removing the skirt portion 4b from the sole portion 4 in the bottom view of the head. The sole contour line E means a contour line that forms the outer peripheral edge of the head 1 when viewed from the bottom of the head. When determining the length L1 of the head 1 in the toe-heel direction, the heel-side end point P is located at a height B of 0.875 inches from the horizontal plane HP, based on the R&A head dimension measurement definition. .

In a preferred embodiment, in a normal state, in a vertical cross section VP1 of the head 1 along the toe-heel direction passing through the center of gravity G of the head, the radius of curvature of the sole bottom portion 4a is configured to be larger than the radius of curvature of the skirt portions 4b on both sides thereof. be. For convenience, each radius of curvature is defined as the radius of curvature of a single circular arc that connects three points, the end points and the midpoint of the outer surface contour line, in each of the cross sections.

As shown in FIGS. 1 and 2, for example, a neck portion 6 may be provided on the heel side of the crown portion 3 . The neck portion 6 is configured in a cylindrical shape having a shaft insertion hole 6a so that a shaft (not shown) can be fixed. The axis centerline of the shaft insertion hole 6a corresponds to the shaft axis centerline CL.

As shown in FIG. 4, the head 1 of this embodiment includes, for example, a cup-shaped face member 20 and a cup-shaped head body 30, which are fixed to each other by welding. However, the present invention is not to be construed as being limited to such an aspect, and includes various structures such as an aspect (not shown) in which the head main body and the plate-like face member are connected, for example.

The face member 20 of this embodiment includes a face portion 2 and a return portion 7 extending rearward of the head from the peripheral edge of the face 2a. The return portion 7 is formed substantially annularly around the face 2 . Such a face member 20 can be prepared, for example, by casting, pressing or forging a plate material, or the like. The face member 20 is made of a metal material such as titanium, a titanium alloy, stainless steel, or an aluminum alloy. In this embodiment, Ti-8Al-1Mo-1V (specific gravity about 4.2) is adopted.

The head body 30 is configured in a cup shape with an opening on the face side. The head main body 30 of this embodiment constitutes the main portion of the back side of the head 1 excluding the face member 20 . Each part of such a head body 30 is integrally molded as, for example, a casting of a metal material. As the metal material of the head body 30, various materials such as titanium, titanium alloy, stainless steel, and aluminum alloy can be used. In a preferred embodiment, the head body 30 is made of a metallic material that can be welded to the face member 20 . The head body 30 of this embodiment is made of the same metal material as the face member 20 .

As shown in FIGS. 3 to 5, in this embodiment, a heavy weight 10 and a reinforcing portion 12 are provided inside the head of the sole bottom portion 4a.

[Heavy goods]
The heavy object 10 is made of, for example, a metal material having a higher specific gravity than the sole bottom portion 4a. In a plan view of the head, the center of gravity of the heavy object 10 is positioned at the sole bottom portion 4a. In the head 1 of the present embodiment, a large weight is distributed intensively to the sole portion 4 by the heavy object 10, so that the center of gravity can be lowered. In a preferred embodiment, the weight of heavy object 10 is 10% or more of the total weight of face member 20 and head body 30 . As a result, a sufficiently large weight is distributed to the sole portion 4, and the center of gravity of the head 1 can be further lowered. In a preferred embodiment, as shown in FIG. 6A, the height C of the center of gravity G of the head from the horizontal plane HP is 9-13 mm.

As the heavy object 10, for example, a metal material with a high specific gravity is desirable. Specifically, the weight 10 is preferably made of an alloy containing W, and more preferably made of a tungsten-nickel-iron alloy containing W, Ni and Fe. Such alloys can be tailored to have higher specific gravities by increasing the proportion of W in their chemical composition. In a more preferred embodiment, the weight 10 has a specific gravity of 7 or higher, more preferably 8 or higher, and still more preferably in the range of 10-15.

In order to further lower the center of gravity of the head 1, the thickness t1 (shown in FIG. 4) of the heavy object 10 is preferably minimized. In a preferred embodiment, the weight 10 is a thin plate with a thickness t1 of 10 mm or less, more preferably 5 mm or less. According to this aspect, the center of gravity of the head 1 can be further lowered.

It is desirable that the heavy object 10 is essentially polygonal with a plurality of straight sides in plan view. The heavy object of this embodiment has a quadrangular shape with four corners in a plan view of the head. More specifically, the heavy object 10 of this embodiment has a trapezoidal shape having two sides substantially parallel to the toe-heel direction of the head 1 . The heavy object 10 includes a toe-side and face-side first corner 10a, a toe-side and back-side second corner 10b, a heel-side and face-side third corner 10c, and a heel-side and back-side fourth corner 10d. .

The heavy object 10 of this embodiment has a trapezoidal shape in which the width W2 on the back side is smaller than the width W1 on the face side. Therefore, the center of gravity of the heavy object 10 is located closer to the face than the central position of the heavy object 10 in the front-rear direction of the head. This also serves, for example, to reduce the depth of the center of gravity of the head 1 and effectively prevent the sweet spot of the face 2a from becoming high. However, it goes without saying that in other aspects of the present invention, various shapes can be adopted as the heavy object 10 .

As shown in FIG. 4 , a thick enclosing portion 9 is provided on the inner surface side of the sole bottom portion 4 a so as to define a recess 8 , and a heavy object 10 is placed in the recess 8 . The recess 8 has a contour shape slightly larger than the weight 10 so that the weight 10 is positioned. A heavy object 10 is fitted into the recess 8 and fixed to the sole bottom portion 4a using, for example, adhesion, welding, screws, or the like. As a result, the heavy object 10 is surrounded by the thick surrounding portion 9 . In the present embodiment, as shown in FIG. 3, the heavy article 10 and the enclosing portion 9 are fixed together by a welded portion 40. As shown in FIG.

[Reinforcement part]
As shown in FIG. 5, the reinforcing portion 12 is configured as a thick portion, and extends from the circumference of the heavy object 10 in at least two directions of the toe side, heel side and back side of the skirt portion 4b. Further, the reinforcing portion 12 connects at least three points around the heavy article 10 to the skirt portion 4b. If there are two connection points, the heavy object 10 can easily move in a rotating direction about a straight line connecting the connection points (two positions). In contrast, by providing three or more connection points as in the present embodiment, it is possible to suppress the movement of the heavy object 10 in the rotational direction as described above.

Of the sole portion 4, the skirt portion 4b has higher rigidity than the sole bottom portion 4a. Therefore, by connecting the periphery of the heavy object 10 to the skirt portion 4b with the thick reinforcing portion 12 having high rigidity, the head 1 of the present embodiment suppresses the vibration of the sole bottom portion 4a when hitting a ball. , can produce a high percussion sound.

In order to exhibit the above-described effect, the reinforcing portion 12 needs to extend from the periphery of the heavy article 10 in at least two directions, i.e., the toe side, the heel side and the back side of the skirt portion 4b. If the reinforcing portion 12 extends only in one of the three sides, the effect of suppressing the vibration of the sole bottom portion 4a cannot be obtained. Further, the reinforcing portion 12 needs to reach the skirt portion 4b having higher rigidity than the sole bottom portion 4a.

The reinforcing portion 12 of this embodiment extends from the surrounding portion 9 surrounding the heavy object 10 to the skirt portion 4b. In such a mode, the heavy article 10 and the reinforcing section 12 are substantially continuous via the enclosing section 9 . Therefore, when the ball is hit, the vibration of the heavy object 10 is more effectively suppressed by the high rigidity of the reinforcing portion 12 and the skirt portion 4b, and a higher hitting sound is generated.

The reinforcing portion 12 of the present embodiment includes, for example, a first reinforcing portion 14 and a second reinforcing portion 15 extending toward the toe side of the skirt portion 4b, and a third reinforcing portion 16 extending toward the heel side of the skirt portion 4b.

The first reinforcing portion 14 extends, for example, from the vicinity of the second corner 10b of the heavy object 10 (first point) toward the toe side of the skirt portion 4b. In this embodiment, the first reinforcing portion 14 extends substantially linearly along the toe-heel direction. Further, the first reinforcing portion 14 has an end portion 14a that does not reach the position of the sole contour line E and terminates within the skirt portion 4b.

The second reinforcing portion 15 extends from the vicinity of the first corner 10a (second point) of the heavy article 10 toward the toe side of the skirt portion 4b. In this embodiment, the second reinforcing portion 15 extends obliquely rearward with respect to the toe-heel direction, that is, extends toward the toe side and the back side. An end portion 15a of the second reinforcing portion 15 on the side of the skirt portion 4b intersects with an end portion 14a of the first reinforcing portion 14 on the side of the skirt portion and terminates. Thus, in the present embodiment, a substantially triangular reinforcing structure is formed on the toe side of the heavy object 10 by the first reinforcing portion 14, the second reinforcing portion 15, and the toe-side frame 9a of the surrounding portion. Since, in the customary shape of the head 1, the sole portion 4 has a larger area on the toe side than on the heel side, such reinforcing structure R effectively reinforces the toe side region of the sole portion, Further enhance the vibration suppression effect.

The third reinforcing portion 16 extends from the entire heel-side edge (third portion) of the heavy article 10 toward the heel side of the skirt portion 4b. In this embodiment, the third reinforcing portion 16 extends toward the heel along the toe-heel direction. An end portion 16a of the third reinforcing portion 16 on the side of the skirt portion 4b also terminates within the skirt portion 4b without reaching the position of the contour line E of the sole.

If the reinforcing portion 12 reaches the skirt portion 4b, it can exhibit the above-described vibration suppression effect of the sole bottom portion 4a. Overlapping with a length L2 of 3 mm or more. This further improves the effect of suppressing the vibration of the sole bottom portion 4a when hitting a ball. On the other hand, in a preferred embodiment, the end portion of the reinforcement portion 12 on the side of the skirt portion 4b has a distance L3 to the sole contour line of 10 mm or less when viewed from the bottom of the head.

7 shows a cross-sectional view taken along line VII--VII in FIG. As shown in FIG. 7, the thick reinforcing portion 12 is preferably configured such that the width w is greater than the height h. As a result, the center of gravity g of the reinforcing portion 12 itself can be positioned at a lower position in the sole portion 4 while enhancing the effect of suppressing the vibration of the sole bottom portion 4a when hitting a ball, which in turn contributes to lowering the center of gravity of the head. The aspect ratio (h/w) of the reinforcing portion 12 is, for example, 80% or less, preferably 60% or less.

A thickness t3 of the sole bottom portion 4a at the position of the reinforcing portion 12 is not particularly limited, but is preferably 5.0 mm or more, more preferably 5.2 mm or more. The thickness of the sole bottom portion 4a at the position of the enclosing portion 9 is also preferably the same as that of the reinforcing portion 12. As shown in FIG.

The thickness t2 of the sole bottom portion 4a and the skirt portion 4b other than the thick reinforcing portion 12 is also not particularly limited, but is preferably in the range of 1.4 to 3.0 mm, more preferably 1.4 to 3.0 mm. 2.5 mm or less.

In the above embodiment, both the heavy weight 10 and the reinforcing portion 12 are provided on the inner side of the sole portion 4 (on the side of the hollow portion i). , of course, may be provided on the outer surface side of the sole portion 4 .

[Modification]
8A and 8B show plan views of the sole portion 4 as a modified example of the reinforcing portion 12. FIG.

FIG. 8(A) shows that the reinforcing portion 12 extends from the periphery of the heavy article 10 in three directions, ie, the toe side, the heel side, and the back side of the skirt portion 4b. That is, in addition to the first to third reinforcing portions 14 to 16, the reinforcing portion 12 includes a fourth reinforcing portion 17 extending from the periphery of the heavy object 10 to the back side. Such a head 1 further enhances the effect of suppressing vibration when hitting a ball as compared with the examples shown in FIGS.

FIG. 8(B) shows a mode in which the reinforcing portion 12 extends from the middle of the side of the polygonal heavy article 10 to the skirt portion 4b instead of the corners thereof. With such a head 1 as well, the effect of suppressing vibration of the sole portion 4 when hitting a ball can be further enhanced.

[Second Invention]
In the embodiment of the first invention, the weight 10 is made of a material having a specific gravity different from that of the sole bottom portion 4a. The second invention is different from the first invention in that a thickened high weight portion 50 is used in the sole bottom portion 4a instead of such a heavy weight 10. are the same.

FIG. 9 is an exploded perspective view of a golf club head 100 according to an embodiment of the second invention before assembly, and FIG. 10 is a cross-sectional view thereof. As shown in FIGS. 9 and 10, the second invention is a golf club head 100 having a hollow portion inside, which includes a face portion 2, a crown portion 3 and a sole portion 4, the sole portion 4 comprising: The sole bottom portion 4a includes the sole bottom portion 4a and the skirt portion 4b, and the sole bottom portion 4a includes a high weight portion 50 thicker than the other portions of the sole bottom portion 4a, and a toe side of the skirt portion 4b extending from the periphery of the high weight portion 50. , and a thick reinforcing portion 12 extending in at least two directions, the heel side and the back side, and the reinforcing portion 12 connects at least three points around the heavy portion 50 to the skirt portion 4b. be. Also in the head 1 of the second aspect, the effect of suppressing the vibration of the sole portion 4 when hitting a ball can be further enhanced as in the first aspect.

In a preferred embodiment, the heavy weight portion 50 may be configured as the thickest portion of the sole portion 4 , but may have the same thickness as the reinforcing portion 12 .

Although the embodiments of the present invention have been described in detail above, it goes without saying that the present invention is not limited to the specific embodiments described above and can be implemented in various ways. Also, it is understood that elements described in one embodiment and variations thereof herein are intended to apply to corresponding elements illustrated in other embodiments without explicit indication. It must be.

In order to confirm the effects of the present invention, a plurality of wood-type golf club heads were produced as prototypes based on the following specifications, and performance evaluations were conducted on these.
<Example>
Head volume: 185cc
Head body and face member: Ti-8Al-1Mo-1V (specific gravity 4.2)
Heavy object: Tungsten, nickel, iron alloy (specific gravity 12)
Shape of heavy object: Trapezoidal (planar area: 225 mm ² ), thickness: 2.0 mm
Configuration of reinforcement: Figure 5
Aspect ratio of reinforcing part First reinforcing part: 80 (%)
Second reinforcement part: 65 (%)
Third reinforcement part: 32.5 (%)
Overlapping length L2 between the reinforcing portion and the skirt portion
First reinforcement part: 10 (mm)
Second reinforcement part: 14.5 (mm)
Third reinforcement part: 13.8 (mm)
Thickness t3 of the bottom of the sole at the location of the reinforcement and enclosing part: 5.2 mm
Thickness t2 of sole bottom other than the above: 2.0mm
<Comparative example>
Although it has basically the same configuration as the embodiment, as shown in FIG. is not provided.

A vibration analysis simulation and an octave analysis of the actual hitting sound were performed on the above two heads with the following capacities.

<Vibration analysis simulation test>
Vibration analysis was performed by putting each of the above heads into a numerical analysis model that can be analyzed by the finite element method and by computer simulation. The results of this test are shown in FIGS. 12 and 13. FIG.

FIG. 12 is a contour diagram of the primary vibration mode of the comparative example. The magnitude of amplitude is represented by the shade of color. FIG. 12A shows a head of a comparative example, which had a natural frequency of 3850 Hz. FIG. 12B shows the head of the example, which has a natural frequency of 4631 Hz, which is higher than that of the comparative example. In addition, in the comparative example, it can be seen that the area of the region displayed whitish near the center of the sole portion is larger than that in the example. This means that the amplitude of the sole portion is large.

FIG. 13 shows the result (frequency spectrum) of ball hitting sound simulation performed using the above numerical analysis model. As is clear from FIG. 13, it can be confirmed that the primary vibration peak pk1 of the head of the example is shifted to the higher frequency side than the primary vibration peak pk2 of the head of the comparative example.

<Battering sound octave analysis>
For the examples and the comparative examples, the same golf ball was actually hit using a swing robot, and the hitting sound was measured. The head speed was 36.0 m/s, and the hitting position was the face center. The hitting sound was recorded by a microphone placed 30 cm on the toe side of the tee. The collected ball hitting sound was subjected to Fourier transform using an FFT analyzer and subjected to 1/3 octave band processing. The results of this test are shown in FIG. As is clear from FIG. 14, the ball hitting sound of the example has an increased sound pressure level in the high frequency band of about 5000-9000 Hz, while the sound pressure level of the low frequency band of about 2500-5000 Hz is higher than that of the ball hitting sound of the comparative example. It was confirmed that the sound pressure level in the band decreased and the hitting sound became higher.

1 golf club head 4 sole portion 4a sole bottom portion 4b skirt portion 9 enclosing portion 10 heavy object 12 reinforcing portion

Claims (9)

A golf club head having a hollow inside,
Including a face portion, a crown portion and a sole portion,
The sole portion includes a sole bottom portion and a skirt portion,
The skirt portion extends from the sole contour toward the center of the head by 15 times the length in the toe-heel direction of the head in a standard state in which the head is placed on a horizontal plane with a specified lie angle and loft angle. % area,
The bottom portion of the sole includes a heavy weight made of a material having a higher specific gravity than that of the bottom portion of the sole, and a thick reinforcement extending from the circumference of the heavy weight in at least two directions, i.e., the toe side, the heel side, and the back side of the skirt portion. and
The reinforcing portion connects at least three locations around the heavy object to the skirt portion ,
The reinforcing portion includes a first reinforcing portion and a second reinforcing portion extending to the toe side of the skirt portion,
The first reinforcing portion extends along the toe-heel direction,
The second reinforcing portion extends from the face portion side toward the toe side and the back side of the first reinforcing portion,
The skirt portion side of the second reinforcing portion intersects with the skirt portion side of the first reinforcing portion,
golf club head.
2. The golf club head according to claim 1, wherein the radius of curvature of the sole bottom surface is larger than the radius of curvature of the skirt portion in a vertical cross section along the toe-heel direction passing through the center of gravity of the head in the reference state. 3. The golf club head according to claim 1, wherein said reinforcing portion extends in three directions of a toe side, a heel side and a back side of said skirt portion. 4. Any one of claims 1 to 3, wherein the sole bottom portion is provided with a thick enclosing portion surrounding the heavy object, and the reinforcing portion extends from the enclosing portion to the skirt portion. A golf club head as described. The heavy object has a square shape in a plan view of the head,
5. The golf club head according to any one of claims 1 to 4, wherein said reinforcing portion extends from three or more corners of said quadrangular shape to said skirt portion. 6. The golf club head according to claim 1, wherein said reinforcing portion overlaps said skirt portion by 3 mm or more. 7. The golf club head of claim 1, wherein the reinforcing portion terminates within the skirt portion without reaching the sole contour. 8. The golf club head according to any one of claims 1 to 7, wherein the width of the reinforcing portion is greater than the height of the reinforcing portion in a cross section perpendicular to the extending direction of the reinforcing portion. A golf club head having a hollow inside,
Including a face portion, a crown portion and a sole portion,
The sole portion includes a sole bottom portion and a skirt portion,
The skirt portion extends from the outer peripheral contour line of the head toward the center of the head in the toe-heel direction when viewed from the bottom of the head in a standard state in which the head is placed on a horizontal plane with a specified lie angle and loft angle. area up to 15%,
The sole bottom portion has a heavy portion thicker than the other portion of the sole bottom portion, and a portion extending in at least two directions from the periphery of the heavy portion to the toe side, heel side, and back side of the skirt portion. and an extending thick reinforcement,
The reinforcing portion connects at least three locations around the heavy portion to the skirt portion ,
The reinforcing portion includes a first reinforcing portion and a second reinforcing portion extending to the toe side of the skirt portion,
The first reinforcing portion extends along the toe-heel direction,
The second reinforcing portion extends from the face portion side toward the toe side and the back side of the first reinforcing portion,
The skirt portion side of the second reinforcing portion intersects with the skirt portion side of the first reinforcing portion,
golf club head.

Images