JP2021151392A - Golf club head and golf club - Google Patents

Abstract

To provide an iron type golf club head that can provide a restitution coefficient that is higher than that of existing golf club heads, especially on a heel side, and to provide a golf club.SOLUTION: A golf club head is an iron type golf club head that includes a face part, a hosel and a connection part for connecting the face part to the hosel. The connection part includes: a hollow part; and an opening part communicated to the hollow part on the back face side thereof.SELECTED DRAWING: Figure 2

Description

The present invention relates to iron-type golf club heads and golf clubs.

Conventionally, in iron-type golf clubs, attempts have been made to increase the coefficient of restitution of the face in order to increase the initial velocity of the hit ball.

For example, in Patent Document 1 below, in an iron type golf club head having a cavity in the back face portion toward the face surface, a counterbore shape recessed toward the outer peripheral portion of the head on the face surface side of the inner wall portion surrounding the cavity. It is described that the undercut portion of the above is provided.

Japanese Patent No. 399493

However, in the technique described in Patent Document 1, although the face is enlarged by the undercut portion and the overall coefficient of restitution is improved, the amount of improvement in the coefficient of restitution on the heel side is very small.

In view of the above circumstances, an object of the present invention is to provide an iron type golf club head and a golf club capable of realizing a higher coefficient of restitution than before, particularly on the heel side.

In order to achieve the above object, the golf club head according to one embodiment of the present invention is an iron type golf club head, and has a face portion, a hosel, and a connecting portion for connecting the face portion and the hosel. The connecting portion has a hollow portion and has an opening on the back face side thereof that communicates with the hollow portion.

By hollowing out the connecting portion, the thickness of the connecting portion can be reduced, the coefficient of restitution (COR) of the face portion, particularly the coefficient of restitution on the heel side can be increased, and the weight of the connecting portion can be reduced by the opening. The height of the center of gravity of the head can be lowered.

The connecting portion may have a weight portion on the heel side of the cavity portion.

As a result, by arranging the surplus weight generated by the hollowing of the connecting portion and the formation of the opening on the heel side, the lateral moment of inertia can be greatly increased without increasing the height of the center of gravity, and the initial velocity at the time of off-center hit. The decrease can be reduced.

The weight portion may be formed at a position that becomes a blind spot of the player when the player addresses the golf club having the iron type golf club head.

As a result, the weight on the heel side is increased to realize a high moment of inertia, and the player can be addressed without discomfort as in a conventional golf club.

Of the connecting portions, the face-side connecting portion facing the opening and adjacent to the face portion may have the same thickness as the face portion so as to form a part of the face portion.

As a result, the coefficient of restitution of the entire face portion can be further improved by extending the face portion to the connecting portion. A portion having the same thickness as the face portion may be formed up to directly below the bottom surface of the hole for inserting the shaft of the hosel (a limit position that does not penetrate the bottom surface).

A golf club according to another embodiment of the present invention has any of the above golf club heads and a golf club shaft attached to the golf club head.

As described above, according to the present invention, it is possible to provide an iron type golf club head and a golf club capable of realizing a higher coefficient of restitution than before, especially on the heel side. However, this effect does not limit the present invention.

It is a front view of the head part of the golf club which concerns on 1st Embodiment of this invention. It is a rear view of the head portion. It is a top view of the head part. It is a side view seen from the heel side of the head portion. FIG. 1 is a cross-sectional view taken along the line AA of FIG. FIG. 1 is a cross-sectional view taken along the line BB of FIG. It is a figure which shows the exposed area of the back surface of a face in the rear view of the head portion. It is a figure which showed the calculation method of the weight distribution of each part of the head. It is a figure which showed an example of the calculation result based on the calculation method shown in FIG. It is a figure which showed other example of the calculation result based on the calculation method shown in FIG. It is a front view of the head part of the golf club which concerns on 2nd Embodiment of this invention. FIG. 11 is a cross-sectional view taken along the line CC of FIG. It is a front view of the head part of the golf club which concerns on 3rd Embodiment of this invention. FIG. 13 is a cross-sectional view taken along the line DD of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
First, the first embodiment of the present invention will be described.

FIG. 1 is a front view showing the appearance of a golf club head portion of a golf club according to the present embodiment, FIG. 2 is a rear view of the head portion, and FIG. 3 is a plan view of the head portion. 4 is a side view of the head portion as viewed from the heel side. 5 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 6 is a cross-sectional view taken along the line BB of FIG.

As shown in these figures, the golf club 100 according to the present embodiment includes an iron-type golf club head 10 (hereinafter, also simply referred to as a head 10) and a golf club shaft 15 attached to the golf club head 10. Have.

The golf club shaft 15 is attached to the golf club head 10 via, for example, a socket (not shown), but may be directly attached without a socket or the like.

The golf club head 10 has a toe portion 1, a heel portion 2, and a center portion 3. The heel portion 2 has a hosel 4, and the center portion 3 is located between the toe portion 1 and the heel portion 2 and is formed around the center of gravity G of the head 10. The hosel 4 has a shaft insertion hole 4a for inserting the golf club shaft 15.

The head 10 has a face 5 that serves as a ball striking surface, and the heel portion 2 has a connecting portion 20 that connects the face 5 and the hosel 4. A top blade 5a is formed on the upper end of the face 5, and a sole 6 is formed on the back side from the lower end of the face 5. A cavity portion 7 is formed on the back surface side of the face 5 so that the back surface of the face 5 is exposed.

As shown in FIG. 2, the boundary b1 between the toe portion and the center portion 3 and the boundary b2 between the heel portion 2 and the center portion 3 have a distance of 21.335 mm from the center of gravity G of the head 10 and are in the toe heel direction. It is formed by two vertical planes. This is because the golf equipment regulations define the impact area as a band-shaped portion having a width of 42.67 mm through the center of gravity.

Instead, the boundaries b1 and b2 may be formed at a distance of 25 mm in the toe-heel direction from the center of gravity G, or may be formed at a distance of 25 mm in the toe-heel direction from the center of the scoreline forming region of the face 5. You may.

The head 10 is integrally cast and forged from a material such as stainless steel such as AM355, and its total weight is larger than that of a general iron type golf club head, for example, 230 to 300 g. ..

In this case, the weight of the center portion 3 is, for example, 30% or less of the total weight of the head 10. In this case, the weight of the heel portion 2 may be 25 to 40% of the total weight of the head 10. In this case, the weight of the toe portion 1 may be 40 to 60% of the total weight of the head 10.

In this case, the length of the head 10 in the toe-heel direction (X direction) (the length from the outer end of the toe portion 1 to the outer end of the heel portion 2 in the X direction) is 135 mm or less.

As a result, the weight of the center portion is suppressed to 30% or less, and the weight of the toe portion 1 and / or the heel portion 2 is increased, so that a higher moment of inertia (lateral moment of inertia) than that of the conventional head can be realized. can.

In order to realize such weight distribution, the toe portion 1 of the head 10 has a toe side extending material portion 11 extending in the vertical direction (Y direction) below the head portion 10 and on the back face side, and the heel portion 2 has a toe portion 2. A heel-side extending member portion 21 extending in the vertical direction (Y direction) is provided below the lower portion and on the side opposite to the center portion 3 with respect to the shaft axis S. The toe-side stretched material portion 11 and the heel-side stretched material portion 21 function as weight parts (weights).

Specifically, the tow side extending material portion 11 has a right-angled triangular pyramid shape formed by extending the side surface of the face 5 on the toe side in the vertical direction and sharing the bottom surface with the sole 6.

Further, as shown in FIG. 1, the weight of the portion of the toe-side extending portion 11 that protrudes from the contour 5e of the face 5 in the front view of the face 5 of the head 10 is 10% of the total weight of the head 10. It may be the above.

Further, the heel-side extending material portion 21 projects a portion of the heel portion 2 on the heel side in the toe-heel direction from the shaft axis S in a mountainous manner in a diagonally downward direction substantially perpendicular to the shaft axis S in each XY plane. It has a plate shape as if it were made.

Further, as shown in FIG. 1, the heel side extending material portion 21 passes through the shaft axis S and is perpendicular to the face surface, and when the head 10 is divided into the heel portion 2 side and the other side, the heel portion 2 side. May be formed so that the weight of the head 10 is 13% or more of the total weight of the head 10.

As shown in FIG. 3, the toe-side extending material portion 11 and the heel-side extending material portion 21 are positioned to be blind spots of the player when the player addresses the golf club 100 (toe-side extending material portion 11 and the heel-side extending material portion 11). It is formed at a position (position that is hidden by a portion located above the rolled material portion 21 and cannot be seen by the player).

As a result, the weight of the toe portion 1 and the heel portion 2 can be increased to realize a high moment of inertia, and the player can be made to address without discomfort as in a conventional golf club.

As shown in FIGS. 2, 4, and 6, the connecting portion 20 has a horn-shaped cavity portion 22 whose volume gradually increases from directly below the hosel 4 toward the center portion 3. Further, the back face side of the connecting portion 20 has an opening 23 communicating with the cavity portion 22. The heel-side extension material portion 21 is formed on the heel side of the cavity portion 22 (the portion of the connecting portion 20 on the heel side of the cavity portion 22 becomes the heel-side extension material portion 21).

By hollowing out the connecting portion 20 and forming the opening 23 in this way, an excess weight is generated, and by arranging the excess weight on the heel side, the lateral moment of inertia can be greatly increased without increasing the height of the center of gravity. It is possible to reduce the decrease in initial velocity at the time of off-center hit.

At the same time, the connecting portion 20 is thinned, the coefficient of restitution (COR) of the face 5, particularly the coefficient of restitution on the heel side can be increased, and the height of the center of gravity can be lowered by having the opening 23.

FIG. 7 is a view showing a region R (cavity portion 7) exposed on the back face side of the back surface of the face 5 of the head 10. The region R includes a region exposed from the opening 23.

As shown in the figure, when the region R is divided by a vertical line passing through the center of gravity G (the point projected onto the region R), the area S1 of the region on the heel portion 2 side and the area S2 of the region on the toe portion 1 side. The ratio of is 0.75 to 1.5.

As a result, by forming a large opening region R on the back face side that extends to the heel portion 2 side more than before, an excess weight is generated, and the weight is arranged at a position far from the center of gravity to increase the moment of inertia. Is possible.

Further, as shown in FIGS. 2 and 4, the top blade 5a has a wall thickness of 4 mm or less, extends from the toe portion 1 to the connecting portion 20 (the lower end of the hosel 4), and the hollow portion 22. And a part of the opening 23.

As a result, the weight of the upper part of the head 10 can be reduced, and the center of gravity G can be lowered accordingly.

Further, the hosel 4 has an outer diameter larger than that of a conventional general one, and its lower end portion is formed in a downward taper shape. Since the hosel 4 is formed to have a larger diameter than the conventional one, the weight of the hosel wall 4b around the shaft insertion hole 4a of the hosel 4 is 8% or more of the total weight of the head 10.

As a result, a high moment of inertia can be realized by distributing the weight to the hosel 4 which is farther from the center of gravity of the heel portion 2.

Further, as shown in FIGS. 2, 5 and 6, the rate of change in the wall thickness of the sole 6 may be 20% or less in the center portion 3. As a result, the wall thickness of the sole portion of the center portion 3 is reduced over a wide range, and the weight of the sole portion is arranged on the heel portion 2 or the toe portion 1, so that the moment of inertia can be increased.

With the above configuration, the moment of inertia (lateral moment of inertia) around the vertical axis of the center of gravity G of the head 10 is set to 4000 g · cm ^ 2 or more.

Further, the height of the center of gravity G when projected onto the face 5 of the head 10 is 22 mm or less.

In order to realize such a moment of inertia and the height of the center of gravity, the present inventor has calculated how much weight should be distributed to which part of the head.

FIG. 8 is a diagram showing a method of calculating the weight distribution of each part of the head 10. As shown in the figure, the four points (A, B, C, D) where the weight is placed on the iron-type head with no extra weight are determined, and the weight distribution and moment of inertia of the four points are shown in the figure. It is calculated using the formula 1 of. At this time, the center of gravity area and weight to be achieved are also set. Of the four points, A corresponds to the position of the hosel 4, B corresponds to the heel side extending material portion 21, C corresponds to the toe side extending material portion 11, and D corresponds to the upper end portion of the toe portion 1.

In the formula 1, M is the total weight of the head 10 after the target weight distribution, mo is the initial weight of the head 10 before the weight distribution, MOI0 is the inertial moment of the head 10 before the weight distribution, xg, yg, zg indicates the coordinates of the target center of gravity G, and I indicates the length from the installation portion of each weight to the target center of gravity.

By using the equation 1, it is possible to obtain the weight distribution that achieves the maximum moment of inertia in the center of gravity area to be designed.

FIG. 9 is a diagram showing an example of a calculation result based on the calculation method shown in FIG. In this example, it is assumed that the head 10 is integrally cast from stainless steel and the total weight (mo) of the head 10 before weight distribution is 127.6 g.

As shown in the figure, 19.2 g and 18.4 g of weight are distributed to the portion A (hosel 4) and the portion B (heel side extension material portion 21), respectively, and to the portion C (toe side extension material portion 11). Achieves a moment of inertia of 4154 gcm ^ 2 and a height of the center of gravity of 17.28 mm by allocating a weight of 89.7 g, which is nearly five times that of them, and allocating almost no weight to the portion D (upper end of the toe). doing.

FIG. 10 is a diagram showing another example of the calculation result based on the calculation method shown in FIG. In this example, it is assumed that the head 10 is manufactured by distributing tungsten as a weight to a titanium head before weight distribution, and the total weight (mo) of the head 10 before weight distribution is 72.9 g. There is. The tungsten member is joined to the head before weight distribution by welding or the like.

As shown in the figure, the weights of 37.3 g and 35.4 g are distributed to the portion A (hosel 4) and the portion B (heel side extension material portion 21), respectively, and to the portion C (toe side extension material portion 11). Achieves a moment of inertia of 5446 gcm ^ 2 and a height of the center of gravity of 17.28 mm by allocating a weight of 108.8 g, which is nearly three times as much as those, and allocating almost no weight to the portion D (upper end of the toe portion). doing. By distributing the weight using a metal different from the material of the general head in this way, it is possible to realize a higher moment of inertia than in the case of integral casting.

[summary]
As described above, according to the present embodiment, by distributing the weight to the lower parts of the toe portion 1 and the heel portion 2, an iron type golf club head having a higher moment of inertia and a lower center of gravity than the conventional one is provided. be able to. Further, by hollowing out the connecting portion 20 of the heel portion 2, the coefficient of restitution (COR) of the face, particularly the coefficient of restitution on the heel side can be increased.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In this embodiment and subsequent embodiments, the parts having the same functions and configurations as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted or simplified.

In the above-described embodiment, the head 10 has both the toe-side extension material portion 11 and the heel-side extension material portion 21, but any one of the toe-side extension material portion 11 and the heel-side extension material portion 21 is provided. It does not have to be.

Further, the shapes and sizes of the toe side extending material portion 11 and the heel side extending material portion 21 are not limited to those shown in the first embodiment.

FIG. 11 is a front view of a head portion of a golf club according to the present embodiment, and FIG. 12 is a cross-sectional view taken along the line CC of FIG.

As shown in both figures, in the present embodiment, the head 10 has only the heel side extending material portion 21 of the toe side extending material portion 11 and the heel side extending material portion 21. Further, the heel side extending member portion 21 of the present embodiment has an oblique quadrangular prism shape in which the front surface and the back surface parallel to the face 5 are substantially parallelograms.

Further, as shown in FIG. 12, in the heel portion 2 according to the present embodiment, the portion of the connecting portion 20 facing the opening 23 and adjacent to the face 5 (face side connecting portion 24) is a part of the face 5. It has the same thickness as the face 5 so as to form. The face-side connecting portion 24 may be formed up to directly below the bottom surface of the shaft insertion hole of the hosel 4 (a limit position where the hosel 4 does not penetrate the bottom surface).

As a result, the coefficient of restitution of the entire face can be further improved by extending the face 5 to the connecting portion 20.

[Third Embodiment]
Next, a third embodiment of the present invention will be described.
In each of the above-described embodiments, the toe side extending material portion 11 and / or the heel side extending material portion 21 are provided for the purpose of increasing the moment of inertia of the head 10, but the coefficient of restitution is not aimed at the high moment of inertia. When the purpose is to increase the height, it is not always necessary to provide the toe side extension material portion 11 and the heel side extension material portion 11.

FIG. 13 is a front view of the head portion of the golf club according to the present embodiment, and FIG. 14 is a cross-sectional view taken along the line DD of FIG.

As shown in both figures, the head 10 according to the present embodiment is the head 10 shown in the second embodiment excluding the heel side extending material portion 21. Even with such a configuration, the coefficient of restitution of the entire face can be further improved by extending the face 5 to the connecting portion 20.

[Modification example]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

For example, the numerical values such as various weights, areas, lengths, and ratios shown in each of the above-described embodiments are not limited to those described above, and can be changed as appropriate.

In the above-described embodiment, the head 10 is manufactured by integral casting or welding of dissimilar metal materials, but the head 10 may be manufactured by a manufacturing method other than these, for example, a 3D printer.

In the above-described embodiment, a middle iron head having a loft angle of about 30 degrees is shown, but the present invention is similarly applicable to a short iron or a wedge having a larger loft angle, and has a more loft angle. It is also applicable to small long irons and utility irons.

1 ... Toe part 2 ... Heel part 3 ... Center part 4 ... Hosel 4a ... Shaft insertion hole 4b ... Hosel wall 5 ... Face 5a ... Top blade 6 ... Sole 7 ... Cavity part 11 ... Toe side extension part 20 ... Connecting part 21 ... Heel side extension 22 ... Cavity 23 ... Opening 24 ... Face side connection 10 ... Golf club shaft 100 ... Golf club G ... Center of gravity

Claims (5)

An iron type golf club head
A face portion, a hosel, and a connecting portion for connecting the face portion and the hosel are provided.
An iron-type golf club head having a hollow portion and an opening communicating with the hollow portion on the back face side of the connecting portion. The iron type golf club head according to claim 1.
The connecting portion is an iron-type golf club head having a weight portion on the heel side of the cavity portion. The iron type golf club head according to claim 1 or 2.
The weight portion is formed at a position that becomes a blind spot of the player when the player addresses a golf club having the iron type golf club head.
Iron type golf club head. The iron type golf club head according to any one of claims 1 to 3.
An iron-type golf club head having the same thickness as the face portion so that the face-side connecting portion facing the opening and adjacent to the face portion of the connecting portion forms a part of the face portion. The iron type golf club head according to any one of claims 1 to 4.
An iron-type golf club including a golf club shaft attached to the golf club head.

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