JP2023056714A - Wood type golf club head - Google Patents

Abstract

To provide a wood type golf club head capable of sufficiently enlarging a lateral moment of inertia.SOLUTION: A wood type golf club head 10 includes a hollow head body 1 having a face part 2, a crown part 3 extending backward from an upper edge of the face part 2, and a sole part 4 extending backward from a lower edge of the face part 2. In a plane view in which the head body 1 is arranged on a horizontal plane so as to have a prescribed lie angle and loft angle, a region sectioned at a toe side and a back side on the basis of the centroid of the head body 1 is a first region R1, and a region sectioned at a heel side and a face side is a second region R2. When a circle C1 having a radius of 50 mm with the centroid G as the center is drawn, weights of a first outside region r1 positioned outside of the circle C1 in the first region R1, and a second outside region r2 positioned outside of the circle C1 in the second region R2 are each 30 g or more.SELECTED DRAWING: Figure 2

Description

The present invention relates to a wood-type golf club head.

A wood-type golf club head having a hollow head body is desired to have a high hitting directionality. It is effective to increase the lateral moment of inertia in order to improve the directionality of hitting a ball with a wood-type golf club head.

In order to increase this lateral moment of inertia, a technique for adjusting the weight of the sole has been proposed (see Japanese Patent Laid-Open No. 2017-293).

Japanese Patent Application Laid-Open No. 2017-293

Patent Document 1 describes that the transverse moment of inertia of the head can be improved by providing a central thin portion in the sole portion and providing a peripheral thick portion so as to surround the central thin portion. Further, Patent Document 1 describes that the width of the peripheral thick portion on the heel side is made larger than the width on the toe side, and that a concave portion for arranging a weight member is provided behind the heel on the sole portion. ing.

As described in Patent Document 1, a conventional wood-type golf club head increases the lateral moment of inertia by adjusting the weight of the sole portion. More specifically, the weight of the heel-side rear part of the head body is increased so that the lateral moment of inertia can be increased while suppressing the slicing of the hit ball.

However, this conventional weight arrangement has limitations in increasing the lateral moment of inertia.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wood-type golf club head capable of sufficiently increasing the lateral moment of inertia.

A wood-type golf club head according to an aspect of the present invention is a hollow head having a face portion, a crown portion extending rearwardly from an upper edge of the face portion, and a sole portion extending rearwardly from a lower edge of the face portion. A first region is a region defined on the toe side and the back side with respect to the center of gravity of the head body in a plan view in which the main body is provided and the head body is arranged on a horizontal plane so as to have a predetermined lie angle and loft angle. , a first outer region located outside the circle in the first region when a circle with a radius of 50 mm centered on the center of gravity is drawn with a region partitioned on the heel side and the face side as the second region; and a second outer region positioned outside the circle in the second region weighs 30 g or more.

The radius of the circle defining the first outer region is preferably 60 mm.

It is preferable that the center of gravity of the head main body is shifted toward the heel side of the face center.

The ratio of the weight of the first outer region and the weight of the second outer region to the weight of the head body is preferably 14% or more.

The ratio of the lateral moment of inertia [g·cm ² ] to the weight [g] of the head body is preferably 27 cm ² or more.

A first weight may be arranged on the ridge line of the first outer region.

A second weight having a specific gravity of 8 or more may be arranged in the second outer region.

In the present invention, the term "front" means the side on which the golf ball is hit, and the term "rear" means the opposite side. "Face center" refers to the vertical center position of the face surface (the front surface of the face portion) at the center position in the toe-heel direction of the face surface. In addition, the "toe-heel direction" refers to the front-rear direction (with respect to the central axis of the shaft) when the head body is placed on a horizontal plane so as to achieve a predetermined lie angle and loft angle (specific lie angle and loft angle of the golf club head). vertical direction) and the horizontal direction perpendicular to the vertical plane. "Lateral moment of inertia" means a moment of inertia about a vertical axis passing through the center of gravity of the head body when the head body is placed on a horizontal plane so as to have a predetermined lie angle and loft angle.

In the wood-type golf club head according to one aspect of the present invention, a weight of 30 g or more is distributed to each of the first outer region and the second outer region defined with respect to the center of gravity of the head body. The moment of inertia can be made sufficiently large.

FIG. 1 is a schematic front view of a wood-type golf club head according to one embodiment of the present invention. 2 is a schematic plan view of the wood-type golf club head of FIG. 1. FIG. 3 is a schematic bottom view of the wood-type golf club head of FIG. 1. FIG. FIG. 4 is a schematic plan view showing a state in which the opening of the wood-type golf club head of FIG. 1 is opened. 5 is a schematic perspective view of the wood-type golf club head of FIG. 4. FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. For the numerical values described in this specification, it is possible to adopt only one of the described upper limit value and lower limit value, or to arbitrarily combine the upper limit value and the lower limit value.

<Wood type golf club head>
As shown in FIGS. 1 to 5 , the wood-type golf club head 10 includes a hollow head body 1 , more specifically, the head body 1 . The head body 1 has a face portion 2 , a crown portion 3 extending rearward from the upper edge of the face portion 2 , and a sole portion 4 extending rearward from the lower edge of the face portion 2 . The head body 1 has side portions 5 extending rearward from the toe side edge and the heel side edge of the face portion 2 and disposed between the crown portion 3 and the sole portion 4, and a shaft. and a shaft attachment portion 6 . A face surface 2 a is provided on the front surface of the face portion 2 . The face surface 2 a constitutes a striking surface of the wood-type golf club head 10 . The wood type golf club head 10 is used, for example, as a driver, utility, fairway wood, or the like. Among others, the wood type golf club head 10 is preferably used as a driver.

As shown in FIGS. 2 to 4, the wood-type golf club head 10 has a center of gravity G of the head body 1 as a reference in a plan view in which the head body 1 is arranged on a horizontal plane so as to have a predetermined lie angle and loft angle. A circle C1 with a radius of 50 mm centered on the center of gravity G is drawn with a first region R1 defined as a region defined on the toe side and the back side, and a second region R2 defined on the heel side and face side. In addition, the weight of the first outer region r1 located outside the circle C1 in the first region R1 and the weight of the second outer region r2 located outside the circle C1 in the second region R2 are each 30 g or more.

As shown in FIGS. 2 to 4, with the center of gravity G of the head body 1 as the origin, the x-axis is the axis extending in the face-back direction with the back direction being positive, and the y-axis is the axis extending in the toe-heel direction with the toe direction being positive, The four quadrants partitioned by the x-axis and the y-axis are the first quadrant (I in FIG. 2), the second quadrant (II in FIG. 2), the third quadrant (III in FIG. 2) and the fourth quadrant (III in FIG. 2). IV), the first region R1 corresponds to the first quadrant, and the second region R2 corresponds to the third quadrant. That is, in the wood-type golf club head 10, the weight of the first outer region r1 positioned outside the circle C1 in the first quadrant and the weight of the second outer region r2 positioned outside the circle C1 in the third quadrant are , each not less than 30 g.

The first outer region r1 is composed of, for example, the crown portion 3, the sole portion 4, the side portions 5, and a first weight 13, which will be described later. Further, the second outer region r2 is composed of, for example, the shaft attachment portion 6, its vicinity region, and a second weight 14, which will be described later. Note that the head body 1 may be configured without the side portion 5 . In this case, the first outer region r1 can be composed of the crown portion 3, the sole portion 4, and the first weight 13, for example. Also, the area near the shaft attachment portion 6 in the second outer area r2 may include a part of the crown portion 3, the sole portion 4, and the side portion 5. As shown in FIG.

In order to increase the lateral moment of inertia of the wood-type golf club head 10, the inventor of the present invention fundamentally reconsidered the conventional weight arrangement described in Patent Document 1. As a result, from the viewpoint of increasing the lateral moment of inertia of the head body 1 while suppressing the shift of the center of gravity G of the head body 1 to the toe side, the area on the toe side and the back side and the center of gravity of the head body 1 in plan view It has been found that it is effective to distribute the weight to a region opposite to this region with G interposed therebetween. More specifically, instead of increasing the weight of the heel-side and back-side regions (the region corresponding to the fourth quadrant described above), which was desired in conventional knowledge, A toe-side and back-side region (first outer region r1) where weight is easily distributed, and a region near the shaft mounting portion 6 (second outer region), which faces this region across the center of gravity G and tends to have a relatively large weight. It has been found that by distributing the weight to the region r2), the lateral moment of inertia can be increased while suppressing the shift of the center of gravity G to the toe side and the back side. That is, the wood-type golf club head 10 is fundamentally different from conventional wood-type golf club heads intended to adjust the weight distribution on the sole portion 4 . As a result of a simulation performed by the applicant using a weight of 50 g so that the weight of the head main body falls within the range of 193 g to 195 g, the lateral moment of inertia when the weight is placed on the heel side and the back side is 4949 g cm ² . , and the lateral moment of inertia was 5102 g·cm ² when the weights were arranged separately on the heel side and back side and on the toe side and back side. On the other hand, in the wood-type golf club head 10 shown in FIGS. 1 to 5, the lateral moment of inertia could be increased to 5639 g·cm ² .

The first outer region r1 may be defined by a circle C2 having a larger radius than the circle C1. The radius of the circle C2 defining the first outer region r1 is preferably 60 mm. The first outer region r1 includes a ridgeline portion on the toe side and the back side, which is the farthest from the center of gravity G in a plan view and where weight can be easily arranged. Therefore, the wood-type golf club head 10 can easily and reliably increase the lateral moment of inertia by increasing the radius of the circle C2 that defines the first outer region r1.

It is preferable that the center of gravity G of the head body 1 is located on the heel side of the face center F on the axis in the toe-heel direction. The wood-type golf club head 10 distributes the weight predominantly to the first outer region r1 and the second outer region r2, and maintains a weight balance between the two, thereby shifting the center of gravity G of the head body 1 to the face center. It can be located on the heel side of F. In other words, the wood-type golf club head 10 distributes weight to the first outer region r1, which has been avoided in the prior art, while at the same time giving weight to the second outer region r2 (the shaft attachment portion 6 and its neighboring region). By evenly distributing the weight, the center of gravity G can be positioned closer to the heel than the face center F. By controlling the position of the face center F in this way, it is possible to suppress the slicing of the hit ball and further improve the directionality of the hit ball.

In general, the lateral moment of inertia of a wood-type golf club head tends to increase as the weight of the golf club head increases. On the other hand, if the weight of the golf club head increases, the head speed will decrease, which may make it difficult to sufficiently increase the flight distance of the hit ball. In this regard, the wood-type golf club head 10 is intended to significantly increase the lateral moment of inertia while suppressing an increase in the weight of the golf club head.

The lower limit of the weight of the head body 1 is preferably 185 g, more preferably 190 g. On the other hand, the upper limit of the weight is preferably 210 g, more preferably 200 g. If the weight is less than the lower limit, the strength of the head body 1 may be insufficient, making it difficult to sufficiently increase the coefficient of restitution. Conversely, if the weight exceeds the upper limit, it may be difficult to achieve a sufficiently high head speed.

The lower limit of the ratio of the weights of the first outer region r1 and the second outer region r2 to the weight of the head body 1 is preferably 14%, more preferably 15%. If the ratio is less than the lower limit, the lateral moment of inertia may not be sufficiently increased. On the other hand, the upper limit of the ratio is not particularly limited, but from the viewpoint of avoiding difficulty in designing the head body 1, it can be set to 20%, for example.

The lower limit of the ratio of the lateral moment of inertia [g·cm ² ] to the weight [g] of the head body 1 is preferably 27 cm ² , more preferably 28 cm ² and even more preferably 29 cm ² . If the ratio is less than the lower limit, there is a possibility that the directivity of the hit ball cannot be sufficiently improved. The upper limit of the ratio is not particularly limited, but can be, for example, 32 cm ² .

The lower limit of the lateral moment of inertia of the head body 1 is preferably 5100 g·cm ² , more preferably 5300 g·cm ² and even more preferably 5500 g·cm ² . The wood-type golf club head 10 can easily and reliably increase the lateral moment of inertia of the head body 1 by distributing the weight to the first outer region r1 and the second outer region r2 as described above. Although the upper limit of the lateral moment of inertia of the head body 1 is not particularly limited, it can be, for example, 6000 g·cm ² .

Next, an example of a specific shape of the wood-type golf club head 10 will be described with reference to FIGS. 1 to 5. FIG.

As shown in FIGS. 4 and 5, the head body 1 has an opening 11 in the crown portion 3. As shown in FIG. As shown in FIGS. 1 and 2, the opening 11 is provided with a lid portion 12 . Parts of the head body 1 other than the cover part 12 are made of metal, for example. This metal includes titanium, stainless steel, maraging steel, aluminum, magnesium, and the like. In the present invention, the term "metal" is a concept including alloys. On the other hand, the lid portion 12 is made of fiber-reinforced resin. Examples of the fiber reinforced resin include carbon fiber reinforced resin (CFRP) and glass fiber reinforced resin (GFRP). In the wood-type golf club head 10, the crown portion 3 includes the lid portion 12, so that the weight of the upper portion of the head body 1 can be reduced. As a result, the weight can be easily distributed to the first outer region r1 and the second outer region r2, and the center of gravity of the head body 1 can be lowered.

(First outer region)
The first outer region r1 is provided so that the region of the head body 1 farthest from the center of gravity G in plan view has a large weight. As shown in FIGS. 4 and 5, in the first outer region r1, the first weight 13 is arranged on the ridgeline portion (the portion that is convexly curved toward the toe side). In the wood-type golf club head 10, the weight of the first outer region r1 can be easily and intensively increased by arranging the first weight 13 on the ridgeline portion of the first outer region r1.

The first weight 13 is preferably arranged continuously on the inner surface of the outer shell that forms the skeleton of the head body 1 . That is, it is preferable that the head body 1 has a thick portion integrally formed by the outer shell body and the first weight 13 at the ridgeline portion on the toe side and the back side. The outer shell and the first weight 13 may be made of the same material, or may be made of different materials.

The first weight 13 extends along the ridge line of the first outer region r1. The first weight 13 may extend beyond the first outer region r1 to the toe-side and face-side region (the region corresponding to the second quadrant described above), and may extend to the heel-side and back-side region (the region corresponding to the second quadrant described above). region corresponding to the fourth quadrant of ). In addition, when the first weight 13 extends beyond the first outer region r1, the volume of the first weight 13 is preferably the largest in the first outer region r1.

Preferably, the first weight 13 is selectively arranged outside a circle C1 centered on the center of gravity G and having a radius of 50 mm. In other words, it is preferable that the first weight 13 is not formed inside the circle C1. It is also preferable that the first weight 13 is selectively arranged outside the circle C2 centered on the center of gravity G and having a radius of 60 mm. In other words, it is also preferable that the first weight 13 is not formed inside the circle C2. By arranging the first weight 13 in this way, the weight of the first outer region r1 can be concentratedly increased.

In the first region R1, it is preferable that no weights that are contained only within the circle C1 are arranged. By configuring the first region R1 in this way, the weight of the first outer region r1 can be easily increased.

(Second outer region)
The second outer region r2 is provided in the shaft mounting portion 6 and its vicinity. The second outer region r2 is arranged at a position facing the first outer region r1 across the center of gravity G in plan view.

A second weight 14 is arranged in the second outer region r2. The second weight 14 is provided close to the shaft attachment portion 6 , and is provided continuously with the shaft attachment portion 6 , for example. In this embodiment, the second weight 14 is arranged on the outer surface of the outer shell of the head body 1 from a position continuous with the shaft mounting portion 6 . As a result, the head body 1 is formed with a thick portion between the shaft mounting portion 6 and the sole portion 4, where the outer shell body and the second weight 14 overlap each other. The second weight 14 may be provided separately from the outer shell, or may be formed integrally with the outer shell using the same material as the outer shell.

As shown in FIG. 3, the second weight 14 has a pair of side surfaces 14a extending from the shaft mounting portion 6 side toward the sole portion 4 side, for example. The distance between the pair of side surfaces 14a increases from the shaft attachment portion 6 side toward the sole portion 4 side. By forming the second weight 14 in this way, it is easy to concentrate and increase the weight of the second outer region r2.

As a lower limit of the specific gravity of the second weight 14, 8 is preferable, 13 is more preferable, and 18 is even more preferable. Normally, the space in which the weight can be arranged in the second outer region r2 is smaller than the space in which the weight can be arranged in the first outer region r1. Therefore, it is preferable that the second weight 14 can increase the weight of the second outer region r2 with a volume smaller than that of the first weight 13 . From this point of view, if the specific gravity is less than the lower limit, it may be difficult to sufficiently increase the weight of the second outer region r2. Examples of high specific gravity materials used for the second weight 14 include tungsten and tungsten alloys.

<Advantages>
The wood-type golf club head 10 distributes a weight of 30 g or more to each of the first outer region r1 and the second outer region r2 defined with the center of gravity G of the head body 1 as a reference, thereby sufficiently reducing the lateral moment of inertia. You can make it bigger.

[Other embodiments]
The above embodiments do not limit the configuration of the present invention. Therefore, in the embodiment, the components of each part of the embodiment can be omitted, replaced, or added based on the description of the present specification and common general technical knowledge, and all of them are interpreted as belonging to the scope of the present invention. should.

As described above, the center of gravity of the head body is preferably located on the heel side of the face center. However, the center of gravity of the head body may coincide with the face center when viewed from the front (front-rear direction). Further, the wood-type golf club head may employ a configuration in which the center of gravity of the head body is located on the toe side of the face center.

The arrangement of weights in the wood-type golf club head is not limited to the arrangement of the above-described embodiments.

For example, the first weight may be spaced apart from the ridge of the first outer region (that is, spaced from the inner surface of the outer shell of the head body). In addition, it is preferable that the first weight extends along the ridge line even when the first weight is spaced apart from the ridge line.

The second weight may be provided, for example, in a region including the shaft attachment portion. Further, the second weight may be arranged on the inner surface side of the outer shell.

Weights other than the first weight and the second weight may not be disposed on the head body. However, if the wood-type golf club head can control the weights of the first outer region and the second outer region within a desired range, weights other than the first weight and the second weight are used. may have

The first weight and the second weight may be divided into multiple pieces.

The specific configuration of the head main body is not limited to the shape of the embodiment. For example, the head main body may be configured without the aforementioned lid portion.

INDUSTRIAL APPLICABILITY As described above, the wood-type golf club head according to one aspect of the present invention is suitable for increasing the directionality of a hit ball by increasing the lateral moment of inertia.

1 head body 2 face portion 2a face surface 3 crown portion 4 sole portion 5 side portion 6 shaft mounting portion 10 wood type golf club head 11 opening 12 lid portion 13 first weight 14 second weight 14a side face F face center G center of gravity R1 First region R2 Second region r1 First outer region r2 Second outer region C1 Circle C2 with a radius of 50 mm centered on the center of gravity Circle with a radius of 60 mm centered on the center of gravity

Claims (7)

a hollow head body having a face portion, a crown portion extending rearward from an upper edge of the face portion, and a sole portion extending rearward from a lower edge of the face portion;
In a plan view in which the head body is arranged on a horizontal plane so as to have a predetermined lie angle and loft angle, a first region is defined as a region divided into a toe side and a back side with respect to the center of gravity of the head body, and a heel side and a back side. When a circle with a radius of 50 mm centered on the center of gravity is drawn with the region partitioned on the face side as the second region, a first outer region located outside the circle in the first region, and the second A wood-type golf club head, wherein the weight of each second outer region located outside the circle in the region is 30 g or more. 2. The wood-type golf club head of claim 1, wherein the radius of the circle defining said first outer region is 60 mm. 3. The wood type golf club head according to claim 1, wherein the center of gravity of the head body is located on the heel side of the face center. 4. The wood-type golf club head according to claim 1, claim 2, or claim 3, wherein the ratio of the weight of said first outer region and said second outer region to the weight of said head body is 14% or more. The wood-type golf club head according to any one of claims 1 to 4, wherein the ratio of the lateral moment of inertia [g·cm ² ] to the weight [g] of the head body is 27 cm ² or more. 6. The wood-type golf club head according to any one of claims 1 to 5, wherein a first weight is arranged on the ridgeline portion of the first outer region. The wood-type golf club head according to any one of claims 1 to 6, wherein a second weight having a specific gravity of 8 or more is arranged in the second outer region.

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