KR20230051071A - Wood type golf club head - Google Patents

Abstract

The purpose of the present invention is to provide a wood-type golf club head which can sufficiently increase the transverse moment of inertia. The wood-type golf club head (10) according to one aspect of the present invention has a hollow head body (1) including 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). When viewed from a plane where the head body (1) is placed on a horizontal plane at a predetermined lie angle and loft angle, an area divided into a toe side and a back side is designated as a first region (R1), and an area divided into a heel side and a face side is designated as a second region (R2) based on the center of gravity of the head body (1). The weights of a first outer region (r1) located outside a circle (C1) in the first region (R1) and a second outer region (r2) located outside the circle (C1) in the second region (R2) are 30 g or greater, respectively, when the circle (C1) with a radius of 50 mm centered on the center of gravity (G) is drawn.

Description

Wood type golf club head {WOOD TYPE GOLF CLUB HEAD}

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

A wood type golf club head having a hollow head body is required to have a high directivity of a hit ball. In a wood-type golf club head, it is effective to increase the transverse moment of inertia in order to increase the directivity of the hit ball.

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

Japanese Unexamined Patent Publication No. 2017-293

Patent Literature 1 describes that the lateral moment of inertia of the head can be improved by forming a thin central portion in the sole portion and forming a peripheral thick portion so as to surround the thin central portion. Further, Patent Literature 1 describes making the width of the heel side of the thick edge portion larger than the width of the toe side, and forming a concave portion for arranging a weight member behind the heel side of the sole portion.

As described in Patent Literature 1, the conventional wood-type golf club head increases the transverse moment of inertia by adjusting the weight of the sole portion. More specifically, the weight on the rear side of the heel side 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, there is a limit to increasing the transverse moment of inertia by this conventional weight arrangement.

The present invention has been made based on such circumstances, and an object of the present invention is 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 one aspect of the present invention includes 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. And, when the head body is viewed from a plane arranged on a horizontal plane so as to have predetermined lie angles and loft angles, a region divided into a toe side and a back side with respect to the center of gravity of the head body as a standard is defined as a first region, and a heel side and a face When a circle with a radius of 50 mm centered on the center of gravity is defined as a second region, the first outer region and the second region located outside the circle in the first region Each of the second outer regions located outside the circle has a weight of 30 g or more.

As a radius of the circle defining the said 1st outer area|region, 60 mm is preferable.

It is sufficient if the center of gravity of the head body is shifted toward the heel side from the center of the face.

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

The ratio of the transverse 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 disposed on the ridge portion of the first outer region.

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

Further, in the present invention, "front" means the side that hits the golf ball, and "rear" means the opposite side. The "face center" refers to the center position of the face surface (front surface of the face portion) in the vertical direction in the center position in the toe heel direction. In addition, the "toe heel direction" means the front-back direction (with respect to the vertical plane including the central axis of the shaft) in a state in which the head body is arranged on a horizontal plane so that the predetermined lie angle and loft angle (lie angle and loft angle inherent to the golf club head) are obtained. vertical direction) and the horizontal direction orthogonal to it. "Transverse moment of inertia" means the moment of inertia around a vertical axis passing through the center of gravity of the head main body in a state where the head main body is arranged on a horizontal plane so as to have predetermined lie angles and loft angles.

(Effects of the Invention)

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 the first outer region and the second outer region defined with respect to the center of gravity of the head body, respectively, so that the lateral moment of inertia is sufficiently reduced. can make it big

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

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail, referring drawings suitably. Note that, for the numerical values described in this specification, it is possible to adopt only one of the upper limit value and lower limit value described, 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 has a hollow head body 1, and more specifically, is made of the head body 1. The head body 1 includes 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. have In addition, the head body 1 has a side portion 5 extending rearward from the side edge of the toe side and the side edge of the heel side of the face portion 2 and disposed between the crown portion 3 and the sole portion 4, It has 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 the striking surface of the wood-shaped golf club head 10. The wood-type golf club head 10 is used as, for example, a driver, utility, or fairway wood. Among them, 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 ( A radius centered on the center of gravity (G) with the region divided into the toe side and the back side based on G) as the first region (R1), and the region divided into the heel and face sides as the second region (R2) When a 50 mm circle C1 is drawn, the first outer region r1 located outside the circle C1 in the first region R1 and the outside of the circle C1 in the second region R2 The weight of the positioned second outer region r2 is 30 g or more.

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

The first outer region r1 is constituted by, for example, a crown portion 3, a sole portion 4, a side portion 5, and a first weight 13 described later. Further, the second outer region r2 is constituted by, for example, the shaft attaching portion 6 and a region near the shaft, and a second weight 14 described later. Further, the head main body 1 may be configured without the side portion 5. In this case, the first outer region r1 can be constituted by, for example, the crown part 3, the sole part 4, and the first weight 13. Further, the region near the shaft attachment portion 6 in the second outer region r2 may include parts of the crown portion 3, the sole portion 4, and the side portion 5.

The present inventor radically reviewed the conventional weight arrangement as described in Patent Literature 1 in order to increase the transverse moment of inertia of the 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 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 head when viewed from the top It has been found that it is effective to distribute the weight in a region opposite to this region with the center of gravity G of the body 1 interposed therebetween. More specifically, instead of increasing the weight of the area on the heel side and the back side (the area corresponding to the fourth upper limit described above), which was desired in the conventional knowledge, when viewed from a plane, the distance from the center of gravity G The area on the toe side and back side where the weight is easily distributed (first outside area r1) and the shaft attachment portion 6 facing this area with the center of gravity G interposed therebetween, where the weight can be relatively easily increased. It was found that 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 by distributing the weight to the nearby region (second outer region r2). That is, the wood-type golf club head 10 is fundamentally different from a conventional wood-type golf club head intended to adjust the weight placement in the sole portion 4. In addition, as a result of the present applicant's simulation using a weight of 50 g so that the weight of the head body is 193 g or more and 195 g or less, the transverse moment of inertia when the weight is placed on the heel side and the back side is 4949 g cm 2 , and the heel side and the back side The transverse moment of inertia when the weights were placed separately on the toe side and the back side was 5102 g·cm 2 . In contrast, with the wood-shaped golf club head 10 shown in Figs. 1 to 5, the moment of inertia in the lateral direction 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. As a radius of the circle C2 defining the 1st outer area|region r1, 60 mm is preferable. The first outer region r1 includes ridges on the toe side and the back side where the weight is most easily placed at the greatest distance from the center of gravity G when viewed from a plan view. Therefore, in the wood-shaped golf club head 10, by increasing the radius of the circle C2 defining the first outer region r1, the transverse moment of inertia can be increased more easily and reliably.

It is preferable that the center of gravity G of the head body 1 is located on the heel side rather than the face center F in the axis in the toe heel direction. The wood-type golf club head 10 distributes the weight centrally to the first outer region r1 and the second outer region r2, and balances the weight between the two, so that the center of gravity of the head body 1 (G) can be located on the heel side rather than the face center (F). In other words, the wood-type golf club head 10 distributes the weight to the first outer region r1, which has been avoided in the past, and simultaneously distributes the weight to the second outer region r2 (shaft attaching portion 6 and its vicinity). By distributing the weight intensively, the center of gravity (G) can be located on the heel side rather 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 batted ball and further improve the directionality of the batted 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, when the weight of the golf club head increases, the head speed decreases, which may make it difficult to sufficiently increase the flight distance of the batted ball. In this regard, the wood-shaped golf club head 10 intends to increase the transverse moment of inertia overwhelmingly while suppressing an increase in the weight of the golf club head.

As a lower limit of the weight of the head main body 1, 185 g is preferable and 190 g is more preferable. On the other hand, as an upper limit of the said weight, 210 g is preferable and 200 g is more preferable. If the weight does not satisfy the lower limit, the strength of the head main body 1 may become insufficient, making it difficult to sufficiently increase the coefficient of restitution. Conversely, when the weight exceeds the upper limit, it may become 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 possibility 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 can be set to, for example, 20% from the viewpoint of avoiding difficulty in designing the head body 1.

The lower limit of the ratio of the transverse 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 still more preferably 29 cm 2 . If the ratio does not satisfy the lower limit, there is a risk that the directionality of the batted ball cannot be sufficiently increased. In addition, although it is not specifically limited as an upper limit of the said ratio, For example, it can be set as 32 cm<2>.

The lower limit of the transverse moment of inertia of the head main body 1 is preferably 5100 g·cm 2 , more preferably 5300 g·cm 2 , and still more preferably 5500 g·cm 2 . 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. can 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·cm 2 .

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

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 lid portion 12 is disposed in the opening 11 . In the head main body 1, parts other than the cover part 12 are made of metal, for example. Titanium, stainless steel, maraging steel, aluminum, magnesium, etc. are mentioned as this metal. In addition, in this invention, "metal" is a concept containing an alloy. On the other hand, the lid portion 12 is made of fiber-reinforced resin. As said fiber reinforced resin, carbon fiber reinforced resin (CFRP) and glass fiber reinforced resin (GFRP) are mentioned, for example. In the wood-type golf club head 10, since the crown portion 3 includes the cover portion 12, 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 reduced.

(first outer area)

The 1st outer region r1 is formed so that the weight of the region most distant from the center of gravity G in the head body 1 when seen from a plane becomes large. As shown in Figs. 4 and 5, in the first outside region r1, the first weight 13 is disposed on the ridge portion (the portion curved convexly to the toe side). In the wood-type golf club head 10, the first weight 13 is disposed on the ridge of the first outer region r1, so that the weight of the first outer region r1 can be easily and intensively increased. there is.

The first weight 13 is preferably arranged continuously on the inner surface of the outer shell constituting the skeleton of the head body 1. That is, the head body 1 preferably has a thick portion integrally formed by the outer shell body and the first weight 13 at the ridges on the toe side and the back side. The outer shell body and the first weight 13 may be formed of the same material or 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 outside region r1 to the toe side and the face side region (region corresponding to the second upper limit described above), or to the heel side and back side region (the above-described fourth upper limit region). area corresponding to the upper limit). 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.

The first weight 13 is preferably disposed selectively outside the circle C1 having 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 inner side of the circle C1. In addition, it is also preferable that the first weight 13 is selectively disposed outside the circle C2 having 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 inner side of the circle C2. Since the first weight 13 is arranged in this way, the weight of the first outer region r1 can be concentratedly increased.

It is preferable that no weight is disposed in the first region R1 so as to be included only in the circle C1. 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 formed on and near the shaft attachment portion 6 . The second outer region r2 is disposed at a position facing the first outer region r1 with the center of gravity G interposed therebetween when viewed from a plane.

A second weight 14 is disposed in the second outer region r2. The second weight 14 is formed adjacent to the shaft attachment portion 6, and is formed continuously to the shaft attachment portion 6, for example. In this embodiment, the 2nd weight 14 is arrange|positioned on the outer surface of the outer shell of the head body 1 from the position which continues to the shaft attachment part 6. As a result, in the head body 1, a thick portion formed by overlapping the outer shell body and the second weight 14 is formed between the shaft attachment portion 6 and the sole portion 4. The second weight 14 may be formed as a separate body from the outer shell body, or may be integrally formed with the outer shell body out of the same material as the outer shell body.

As shown in FIG. 3 , the second weight 14 has a pair of side surfaces 14a extending from the shaft attachment 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 increase the weight of the second outer region r2 intensively.

The lower limit of the specific gravity of the second weight 14 is preferably 8, more preferably 13, and still 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, the second weight 14 preferably has a smaller volume than the first weight 13 and can increase the weight of the second outer region r2. From this point of view, if the specific gravity does not satisfy the lower limit, it may be difficult to sufficiently increase the weight of the second outer region r2. In addition, as a high specific gravity material used for the 2nd weight 14, tungsten, a tungsten alloy, etc. are mentioned, for example.

<Advantages>

The wood-type golf club head 10 distributes a weight of 30 g or more to the first outer region r1 and the second outer region r2 defined with respect to the center of gravity G of the head body 1, respectively. The transverse moment of inertia can be sufficiently large.

[Other embodiments]

The above embodiment does not limit the configuration of the present invention. Therefore, omission, substitution, or addition of components of each part of the embodiment is possible based on the description and common sense of the present specification, and they should all be construed as belonging to the scope of the present invention.

As described above, the center of gravity of the head body is preferably located on the heel side rather than the face center. However, the center of gravity of the head body may coincide with the center of the face when viewed from the front (when viewed from the front-rear 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 weights in the wood-type golf club head is not limited to the arrangement in the above-described embodiment.

For example, the first weight may be disposed at a distance from the ridge portion of the first outer region (ie, at a distance from the inner surface of the outer shell body of the head body). Also, the first weight preferably extends along the ridge even when the first weight is spaced apart from the ridge.

The second weight may be formed in a region including the shaft attaching portion, for example. Also, the second weight may be disposed on the inner surface side of the outer shell body.

Weights other than the first weight and the second weight may not be disposed on the head body. However, the wood-type golf club head may have weights other than the first weight and the second weight as long as the weights of the first outside region and the second outside region can be controlled within a desired range.

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

The specific configuration of the head body is not limited to the shape of the above embodiment. For example, the head main body can also have a configuration without the above-described lid portion.

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

1: head body 2: face part
2a: face surface 3: crown portion
4: sole part 5: side part
6: shaft attachment part 10: wood type golf club head
11: opening 12: cover portion
13: first weight 14: second weight
14a: side F: face center
G: center of gravity R1: first area
R2: second region r1: first outer region
r2: second outer region
C1: a circle with a radius of 50 mm centered on the center of gravity
C2: a 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 rearwardly from an upper edge of the face portion, and a sole portion extending rearwardly from a lower edge of the face portion;
When the head body is viewed from a plane arranged on a horizontal plane so as to have predetermined lie angles and loft angles, a region divided into a toe side and a back side with respect to the center of gravity of the head body as a reference is defined as a first region, and a heel side and a face side are divided. When a circle with a radius of 50 mm centered on the center of gravity is drawn, the first outer region located outside the circle in the first region and the circle in the second region are defined as a second region. A wood-type golf club head having a weight of 30 g or more in each of the second outer regions located outside the head. According to claim 1,
A wood-type golf club head in which a radius of a circle defining the first outer region is 60 mm. According to claim 1 or 2,
A wood-type golf club head in which the center of gravity of the head body is located on the heel side of the face center. According to claim 1 or 2,
A wood-type golf club head wherein a weight ratio of the first outer region and the second outer region to the weight of the head body is 14% or more. According to claim 1 or 2,
A wood-type golf club head having a ratio of moment of inertia [g cm 2 ] to weight [g] of the head body of 27 cm 2 or more. According to claim 1 or 2,
A wood-type golf club head having a first weight disposed on a ridge of the first outer region. According to claim 1 or 2,
A wood-type golf club head in which a second weight having a specific gravity of 8 or more is disposed in the second outer region.

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