KR102716761B1 - Wood type golf club head - Google Patents

Abstract

(Problem) The present invention aims to provide a wood-type golf club head capable of sufficiently increasing the transverse moment of inertia.
(Solution) A wood-type golf club head (10) according to one embodiment of the present invention comprises a hollow head body (1) having a face portion (2), a crown portion (3) extending rearward from an upper edge of the face portion (2), and a sole portion (4) extending rearward from a lower edge of the face portion (2), and when viewed from a plane in which the head body (1) is arranged on a horizontal plane so as to have a predetermined lie angle and loft angle, a region divided into the toe side and the back side based on the center of gravity of the head body (1) is designated as a first region (R1), a region divided into the heel side and the face side is designated as a second region (R2), and when a circle (C1) having a radius of 50 mm is drawn with the center of gravity (G) as its center, a first outer region (r1) located outside the circle (C1) in the first region (R1) and a second outer region (R2) located outside the circle (C1) in the second region (R2) The weight of each area (r2) is 30g or more.

Description

WOOD TYPE GOLF CLUB HEAD

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

In wood-type golf club heads having a hollow head body, high directionality of the hit is desired. In order to increase the directionality of the hit in wood-type golf club heads, it is effective to increase the transverse moment of inertia.

A technology for adjusting the weight of the sole has been proposed to increase this transverse moment of inertia (see Japanese Patent Application Laid-Open No. 2017-293).

Japanese Patent Publication No. 2017-293

Patent Document 1 describes that the transverse moment of inertia of a head can be improved by forming a central thin section in a sole section and forming a peripheral thick section surrounding the central thin section. In addition, Patent Document 1 describes that the width of the peripheral thick section on the heel side is made larger than the width on the toe side, and that a concave section is formed at the rear of the heel side of the sole section for arranging a weight member.

As described in Patent Document 1, conventional wood-type golf club heads increase the transverse moment of inertia by adjusting the weight of the sole. More specifically, the weight of the rear heel side of the head body is increased so as to increase the transverse moment of inertia while suppressing the slicing of the ball.

However, there is a limit to increasing the transverse moment of inertia with this conventional weight distribution.

The present invention has been made based on such circumstances, and aims to provide a wood-type golf club head capable of sufficiently increasing the transverse moment of inertia.

A wood-type golf club head according to one embodiment of the present invention comprises a hollow head body 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, wherein when the head body is viewed from a plane in which the head body is arranged on a horizontal plane so as to have predetermined lie angles and loft angles, a region defined by the toe side and the back side based on the center of gravity of the head body is a first region, a region defined by the heel side and the face side is a second region, and when a circle with a radius of 50 mm is drawn with the center of gravity as the center, a first outer region located outside the circle in the first region and a second outer region located outside the circle in the second region each have a weight of 30 g or more.

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

It is good if the center of gravity of the head body is positioned toward the heel rather than the face center.

It is preferable that the ratio of the weight of the first outer region and the second outer region to the weight of the head body be 14% or more.

The ratio of the transverse moment of inertia [g·cm2] to the weight [g] of the head body is preferably 27㎠ or more.

It is preferable that the first weight be placed on the ridge portion of the first outer region.

It is preferable that a second weight having a specific gravity of 8 or greater be placed in the second outer region.

In addition, in the present invention, "front" means the side hitting the golf ball, and "rear" means the opposite side. "Face center" means the upper and lower central position of the face surface (the front surface of the face portion) in the toe-heel direction central position. In addition, "toe-heel direction" means a horizontal direction orthogonal to the front-back direction (the direction perpendicular to the vertical plane including the central axis of the shaft) when the head body is arranged on the horizontal plane so as to have predetermined lie angle and loft angle (the lie angle and loft angle unique to the golf club head). "Transverse moment of inertia" means the moment of inertia around the vertical axis passing through the center of gravity of the head body when the head body is arranged on the horizontal plane so as to have predetermined lie angle and loft angle.

(Effect of invention)

According to one embodiment of the present invention, a wood-type golf club head has a weight of 30 g or more distributed to each of the first outer region and the second outer region determined based on the center of gravity of the head body, so that the transverse moment of inertia can be sufficiently large.

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

Hereinafter, embodiments of the present invention will be described in detail with appropriate reference to the drawings. In addition, with respect to the numerical values described in this specification, it is possible to adopt only one of the described upper and lower limits, or to arbitrarily combine the upper and lower limits.

<Wood type golf club head>

As shown in FIGS. 1 to 5, the wood-type golf club head (10) has a hollow head body (1), and more specifically, is composed of the head body (1). The head body (1) has a face portion (2), a crown portion (3) extending rearwardly from an upper edge of the face portion (2), and a sole portion (4) extending rearwardly from a lower edge of the face portion (2). In addition, the head body (1) has a side portion (5) extending rearwardly from a toe-side side edge and a heel-side side edge of the face portion (2) and positioned between the crown portion (3) and the sole portion (4), and a shaft attachment portion (6) to which a shaft is attached. A face surface (2a) is formed on the front surface of the face portion (2). The face surface (2a) constitutes a striking surface of the wood-type golf club head (10). The above wood-type golf club head (10) is used as, for example, a driver, a utility, a fairway wood, etc. Among them, the above wood-type golf club head (10) is preferably used as a driver.

As shown in FIGS. 2 to 4, when the wood-type golf club head (10) is viewed from a plane in which the head body (1) is arranged on a horizontal plane so as to have a predetermined lie angle and loft angle, the center of gravity (G) of the head body (1) is used as a reference, and a region divided into the toe side and the back side is designated as a first region (R1), and a region divided into the heel side and the face side is designated as a second region (R2), and when a circle (C1) having a radius of 50 mm is drawn with the center of gravity (G) as its center, the first outer region (r1) located outside the circle (C1) in the first region (R1) and the second outer region (r2) located outside the circle (C1) in the second region (R2) each have a weight of 30 g or more.

As shown in FIGS. 2 to 4, when the center of gravity (G) of the head body (1) is taken as the origin, the axis extending in the face-back direction with the back direction as the positive direction is the x-axis, the axis extending in the toe-heel direction with the toe direction as the positive direction is the y-axis, and when four upper limits defined by the x-axis and the y-axis are taken as the first upper limit (FIG. 2 I), the second upper limit (FIG. 2 II), the third upper limit (FIG. 2 III), and the fourth upper limit (FIG. 2 IV), the first region (R1) corresponds to the first upper limit, and the second region (R2) corresponds to the third upper limit. That is, the weight of the first outer region (r1) located outside the circle (C1) in the first upper limit and the weight of the second outer region (r2) located outside the circle (C1) in the third upper limit of the wood-type golf club head (10) are each 30 g or more.

The first outer region (r1) is composed of, for example, a crown portion (3), a sole portion (4), a side portion (5), and a first weight (13) described later. In addition, the second outer region (r2) is composed of, for example, a shaft attachment portion (6) and a region near it, and a second weight (14) described later. In addition, the head body (1) may be configured not to have a side portion (5). In this case, the first outer region (r1) may be composed of, for example, a crown portion (3), a sole portion (4), and a first weight (13). In addition, the region near the shaft attachment portion (6) in the second outer region (r2) may include a part of the crown portion (3), the sole portion (4), and the side portion (5).

The inventor of the present invention has fundamentally re-examined the conventional weight arrangement as described in Patent Document 1 in order to increase the transverse moment of inertia of a wood-type golf club head (10). As a result, from the viewpoint of increasing the transverse moment of inertia of the head body (1) while suppressing the center of gravity (G) of the head body (1) from shifting to the toe side, the inventor has obtained the knowledge that it is effective to distribute the weight to an area on the toe side and also on the back side and to an area opposing this area with the center of gravity (G) of the head body (1) interposed therebetween when viewed from a planar view. To explain in more detail, instead of increasing the weight in the heel-side and back-side areas (areas corresponding to the fourth upper limit described above) as was desired in the conventional view, the weight is distributed in the toe-side and back-side areas (first outer area (r1)) which are the areas farthest from the center of gravity (G) when viewed from a plane and where it is easy to distribute weight, and in the area near the shaft attachment portion (6) (second outer area (r2)) which is opposite to this area across the center of gravity (G) and where it is easy to relatively increase the weight, thereby obtaining the view that the center of gravity (G) can be suppressed from shifting to the toe-side and back-side while increasing the transverse moment of inertia. That is, the wood-type golf club head (10) is fundamentally different from the conventional wood-type golf club head which is intended to adjust the weight arrangement in the sole portion (4). In addition, as a result of the simulation conducted by the applicant using a 50g weight so that the weight of the head body is within 193g or more and 195g or less, the transverse moment of inertia was 4949g·cm2 when the weight was placed on both the heel side and the back side, and the transverse moment of inertia was 5102g·cm2 when the weight was placed separately on both the heel side and the back side and on both the toe side and the back side. In contrast, with the wood-type golf club head (10) shown in FIGS. 1 to 5, the transverse moment of inertia could be increased to 5639g·cm2.

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 ridge on the toe side and the back side, which are farthest from the center of gravity (G) when viewed from a plane and where weight is easily placed. Therefore, the wood-shaped golf club head (10) can more easily and reliably increase the transverse moment of inertia by increasing the radius of the circle (C2) defining the first outer region (r1).

The center of gravity (G) of the head body (1) is preferably located closer to the heel than the face center (F) in the toe-heel direction axis. The wood-type golf club head (10) can position the center of gravity (G) of the head body (1) closer to the heel than the face center (F) by distributing the weight mainly to the first outer region (r1) and the second outer region (r2) and maintaining a balance of weight between the two. In other words, the wood-type golf club head (10) can position the center of gravity (G) closer to the heel than the face center (F) by distributing the weight mainly to the first outer region (r1) that was previously avoided while also distributing the weight mainly to the second outer region (r2) (the shaft attachment portion (6) and the area near it). 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 transverse 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, there is a concern that as the weight of the golf club head increases, the head speed decreases, making it difficult to sufficiently increase the distance of the hit ball. In this regard, the wood-type golf club head (10) is intended to suppress the increase in the weight of the golf club head while overwhelmingly increasing the transverse moment of inertia.

The lower limit of the weight of the head body (1) is preferably 185 g, and more preferably 190 g. On the other hand, the upper limit of the weight is preferably 210 g, and more preferably 200 g. If the weight does not meet 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, there is a concern that it may be difficult to sufficiently increase the head speed.

The lower limit of the ratio of the weight of the first outer region (r1) and the second outer region (r2) to the weight of the head body (1) is preferably 14%, and more preferably 15%. If the ratio does not satisfy the lower limit, there is a concern that the transverse moment of inertia cannot 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, for example, 20%.

The lower limit of the ratio of the transverse moment of inertia [g·cm2] to the weight [g] of the head body (1) is preferably 27㎠, more preferably 28㎠, and even more preferably 29㎠. If the ratio does not satisfy the lower limit, there is a concern that the directionality of the hit may not be sufficiently increased. In addition, the upper limit of the ratio is not particularly limited, but may be, for example, 32㎠.

The lower limit of the transverse moment of inertia of the head body (1) is preferably 5100 g·cm2, more preferably 5300 g·cm2, and even more preferably 5500 g·cm2. As described above, the wood-type golf club head (10) can easily and reliably increase the transverse moment of inertia of the head body (1) by distributing the weight to the first outer region (r1) and the second outer region (r2). In addition, the upper limit of the transverse moment of inertia of the head body (1) is not particularly limited, but can be, for example, 6000 g·cm2.

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

As shown in FIGS. 4 and 5, the head body (1) has an opening (11) in the crown portion (3). As shown in FIGS. 1 and 2, a cover portion (12) is arranged in the opening (11). A portion of the head body (1) other than the cover portion (12) is made of, for example, metal. Examples of the metal include titanium, stainless steel, maraging steel, aluminum, magnesium, and the like. In addition, in the present invention, the term “metal” includes an alloy. Meanwhile, the cover 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). Since the crown portion (3) of the wood-type golf club head (10) includes the cover portion (12), the weight of the upper portion of the head body (1) can be reduced. As a result, weight can be easily distributed to the first outer region (r1) and the second outer region (r2), and a low center of gravity of the head body (1) can be achieved.

(First outer region)

The first outer region (r1) is formed so that the weight of the region furthest from the center of gravity (G) when viewed from the plane of the head body (1) is large. As shown in FIGS. 4 and 5, the first outer region (r1) has a first weight (13) arranged on a ridge (a portion convexly curved toward the toe). The wood-type golf club head (10) can easily and intensively increase the weight of the first outer region (r1) by arranging the first weight (13) on the ridge of the first outer region (r1).

It is preferable that the first weight (13) is arranged continuously on the inner surface of the outer shell forming the skeleton of the head main body (1). That is, it is preferable that the head main body (1) has a rear portion integrally formed by the outer shell and the first weight (13) on the ridges of the toe side and the back side. The outer shell and the first weight (13) may be formed of the same material, or may be formed of different materials.

The first weight (13) extends along the ridge of the first outer region (r1). The first weight (13) may extend beyond the first outer region (r1) to the region on the toe side and the face side (the region corresponding to the second upper limit described above), and may extend to the region on the heel side and the back side (the region corresponding to the fourth upper limit described above). In addition, when the first weight (13) extends beyond the first outer region (r1), it is preferable that the volume of the first weight (13) is the largest in the first outer region (r1).

It is preferable that the first weight (13) is selectively arranged on the outside of a circle (C1) with a radius of 50 mm centered on the center of gravity (G). That is, it is preferable that the first weight (13) is not formed to the inside of the circle (C1). In addition, it is also preferable that the first weight (13) is selectively arranged on the outside of a circle (C2) with a radius of 60 mm centered on the center of gravity (G). That is, it is also preferable that the first weight (13) is not formed to the inside of the circle (C2). By arranging the first weight (13) in this manner, the weight of the first outer region (r1) can be intensively increased.

It is preferable that no weights are placed in the first region (R1) that are included only within the circle (C1). By configuring the first region (R1) in this way, the weight of the first outer region (r1) can be easily increased.

(2nd outer area)

The second outer region (r2) is formed at the shaft attachment portion (6) and its vicinity. The second outer region (r2) is positioned opposite the first outer region (r1) with the center of gravity (G) interposed therebetween when viewed from a plane.

A second weight (14) is arranged in the second outer region (r2). The second weight (14) is formed close to the shaft attachment portion (6), for example, formed continuously to the shaft attachment portion (6). In the present embodiment, the second weight (14) is arranged on the outer surface of the outer shell of the head main body (1) from a position continuous to the shaft attachment portion (6). As a result, a thick portion is formed in the head main body (1) between the shaft attachment portion (6) and the sole portion (4), in which the outer shell and the second weight (14) are polymerized. The second weight (14) may be formed as a separate body 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, for example, a pair of side surfaces (14a) extending from the shaft attachment portion (6) side toward the sole portion (4) side. The gap 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 manner, it is easy to concentrate and increase the weight of the second outer region (r2).

The lower limit of the specific gravity of the second weight (14) is preferably 8, more preferably 13, and even more preferably 18. Normally, the space in which the weight can be placed in the second outer region (r2) is smaller than the space in which the weight can be placed in the first outer region (r1). Therefore, it is preferable that the second weight (14) be able to increase the weight of the second outer region (r2) with a smaller volume than the first weight (13). From this point of view, if the specific gravity does not satisfy the lower limit, there is a concern that it will be difficult to sufficiently increase the weight of the second outer region (r2). In addition, examples of high-specific gravity materials used in the second weight (14) include tungsten, a tungsten alloy, and the like.

<Advantages>

The above wood-type golf club head (10) can sufficiently increase the transverse moment of inertia by distributing a weight of 30 g or more to each of the first outer region (r1) and the second outer region (r2) determined based on the center of gravity (G) of the head body (1).

[Other embodiments]

The above embodiment does not limit the configuration of the present invention. Therefore, the above embodiment may omit, substitute, or add components of each part of the above embodiment based on the description of this specification and technical common sense, and they should all be interpreted as falling within the scope of the present invention.

As described above, it is preferable that the center of gravity of the head body be located on the heel side rather than the face center. However, the center of gravity of the head body may coincide with the face center when viewed from the front (when viewed from the front-back direction). In addition, the wood-type golf club head may adopt a configuration in which the center of gravity of the head body is located on the toe side rather than the face center.

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

For example, the first weight may be arranged at a distance from the ridge of the first outer region (i.e., at a distance from the inner surface of the outer shell of the head main body). In addition, even when the first weight is arranged at a distance from the ridge, it is preferable that it extends along the ridge.

The second weight may be formed, for example, in an area including the shaft attachment portion. In addition, the second weight may be arranged on the inner side of the outer shell.

The head body may not be provided with weights other than the first weight and the second weight. However, the wood-type golf club head may have weights other than the first weight and the second weight if the weights of the first outer region and the second outer region can be controlled within a desired range.

The above first weight and the above second weight may be divided into a plurality of parts.

The specific configuration of the above head body is not limited to the shape of the above embodiment. For example, the head body may have a configuration that does not have the above-described cover part.

(Industrial applicability)

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

1: Head body 2: Face part
2a: Face 3: Crown
4: Sole 5: Side
6: Shaft attachment 10: Wood type golf club head
11: Opening 12: Cover
13: 1st weight 14: 2nd weight
14a: Side F: Face Center
G: Center of gravity R1: Area 1
R2: Second region R1: First outer region
r2: second outer region
C1: A circle with a radius of 50mm centered on the center of gravity
C2: A circle with a radius of 60mm centered on the center of gravity

Claims (7)

It has a hollow head body 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.
When viewed from a plane in which the head body is arranged on a horizontal plane so as to have a predetermined lie angle and loft angle, an area divided into the toe side and the back side based on the center of gravity of the head body is designated as a first area, an area divided into the heel side and the face side is designated as a second area, and when a circle with a radius of 50 mm is drawn with the center of gravity as its center, the weights of the first outer area located outside the circle in the first area and the second outer area located outside the circle in the second area are each 30 g or more,
A wood-type golf club head, wherein the ratio of the weight of the first outer region and the second outer region to the weight of the head body is each 14% or more, or the ratio of the transverse moment of inertia [g·cm2] to the weight [g] of the head body is 27㎠ or more. In paragraph 1,
A wood-shaped golf club head having a radius of 60 mm of a circle defining the first outer area. In claim 1 or 2,
A wood-type golf club head in which the center of gravity of the head body is located closer to the heel than the face center. In claim 1 or 2,
A wood-type golf club head having a first weight disposed on a ridge portion of the first outer region. In claim 1 or 2,
A wood-type golf club head having a second weight having a specific gravity of 8 or greater disposed in the second outer region. delete delete