KR102707890B1 - Wood type golf club head - Google Patents

Abstract

(Problem) The present invention aims to provide a wood-type golf club head capable of achieving low spin of a hit.
(Solution) A wood-type golf club head (10) according to one embodiment of the present invention has a hollow head body (1) having a face portion (11), and a height (H1) of a projection point (P) obtained by vertically projecting the center of gravity (G) of the wood-type golf club head (10) onto the front surface of the face portion (11) is 0.4 or more and 0.5 or less with respect to the height (H) of the entire face portion (11), and when the wood-type golf club head (10) is placed on a horizontal plane so as to have predetermined lie angles and loft angles, a maximum length (L2) of the head body (1) in the front-back direction is 80 mm or more, and a front-back distance (L1) between the center of gravity (G) of the wood-type golf club head and a leading edge (E) is 30 mm or less.

Description

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 be able to increase the distance of the hit.

In order to increase the distance of the ball, it is effective to realize low spin of the ball. From this viewpoint, in the wood-type golf club head, it is required to lower the position of the projection point that vertically projects the center of gravity of the entire head onto the front surface of the face. In order to lower the position of this projection point, it is effective to shift the center of gravity of the golf club head downward and forward (hereinafter, shifting the center of gravity of the golf club head downward is referred to as “low center of gravity,” and shifting the center of gravity of the golf club head forward is also referred to as “shallow center of gravity”).

Conventionally, a technique for achieving a low center of gravity in a golf club head has been practiced by placing weight materials in the sole (see Patent Document 1).

Japanese Patent Publication No. 2010-234108 Japanese Patent Publication No. 2005-6835

However, when the technology described in patent document 1 is used, it is difficult to sufficiently achieve a shallow center of gravity of the golf club head.

Meanwhile, Patent Document 2 describes using a fiber-reinforced resin body having a lower specific gravity than metal for a portion of a golf club head. Patent Document 2 describes that by using a fiber-reinforced resin body for a portion of a golf club head, weight is allocated to a sole plate or a weight material arranged at the rear of the sole plate. However, Patent Document 2 only describes using a fiber-reinforced resin body for suppressing an increase in the weight of the entire golf club head, and does not describe shallowing the center of gravity of the golf club head.

The present invention has been made based on these circumstances, and an object of the present invention is to provide a wood-type golf club head capable of achieving low spin in a hit.

In order to solve the above-mentioned problem, according to one embodiment of the present invention, a wood-type golf club head is provided having a hollow head body having a face portion, wherein a height of a projection point obtained by vertically projecting the center of gravity of the wood-type golf club head onto the front surface of the face portion is 0.4 or more and 0.5 or less with respect to the height of the entire face portion, and when the wood-type golf club head is placed on a horizontal plane so as to have predetermined lie angles and loft angles, the maximum length of the head body in the front-back direction is 80 mm or more, and the front-back distance between the center of gravity of the wood-type golf club head and the leading edge is 30 mm or less.

The head body may have a first part including the face portion, and a second part connected to the first part and positioned at the rear of the first part, and the specific gravity of the second part may be smaller than that of the first part.

The above second part may include a fiber-reinforced resin.

The above second part may be made only of fiber reinforced resin.

The main component of the above first part may be metal.

The above metal can be titanium.

The ratio of the specific gravity of the second portion to the specific gravity of the first portion is preferably 0.18 or more and 0.6 or less.

In addition, in the present invention, "front" means the striking side, and "back" means the opposite side. "Main component" means the component with the largest content in mass conversion, and for example, means a component with a content of 50 mass% or more.

According to one embodiment of the present invention, a wood-type golf club head has a height of a projection point that is obtained by vertically projecting the center of gravity of the wood-type golf club head onto the front surface of the face portion, which is 0.4 or more and 0.5 or less with respect to the height of the entire face portion, and further, when the wood-type golf club head is arranged on a horizontal plane so as to have predetermined lie angles and loft angles, the distance between the center of gravity of the wood-type golf club head and the leading edge in the front-back direction is 30 mm or less, thereby thoroughly achieving a low center of gravity and a shallow center of gravity. Therefore, the wood-type golf club head can realize low spin of a hit ball. The wood-type golf club head, while thoroughly achieving a low center of gravity and a shallow center of gravity, has a maximum length of the head main body in the front-back direction of 80 mm or more when the wood-type golf club head is arranged on a horizontal plane so as to have predetermined lie angles and loft angles. As a result, it is easy to obtain a desired appearance.

FIG. 1 is a schematic side view of a wood-type golf club head according to one embodiment of the present invention, as viewed from the toe side.
Figure 2 is a schematic plan view of the wood-type golf club head of Figure 1.
FIG. 3 is a schematic perspective view showing a first part of the wood-type golf club head of FIG. 1.
FIG. 4 is a schematic cross-sectional view showing a connection portion between the first part and the second part of the wood-type golf club head of FIG. 1.
Fig. 5 is a schematic VV cross-sectional view showing a second part of the wood-type golf club head of Fig. 1.

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

[Golf Club Head]

The wood-type golf club head (10) of FIGS. 1 and 2 has a hollow head body (1) having a face portion (11). In addition, the wood-type golf club head (10) has a neck portion (2) into which a shaft (not shown) is inserted. The head body (1) has a sole portion (12) extending rearwardly from the lower edge of the face portion (11), a crown portion (13) extending rearwardly from the upper edge of the face portion (11), and a side portion (14) extending rearwardly from the side edge on the toe side and the side edge on the heel side of the face portion (11) and positioned between the sole portion (12) and the crown portion (13). The front surface of the face portion (11) constitutes a striking surface of the wood-type golf club head (10) (hereinafter, the front surface of the face portion is also referred to as a “face surface (11a)”).

As shown in Fig. 1, the wood-shaped golf club head (10) has a height (H1) of a projection point (P) that vertically projects the center of gravity (G) of the wood-shaped golf club head (10) onto the front surface (i.e., the face surface (11a)) of the face portion (11) in a range of 0.4 to 0.5 with respect to the height (H) of the entire face portion (11). In other words, a comparison (H1/H) of the height (H1) of the projection point (P) to the height (H) of the entire face portion (11) measured in a projection image that projects the face portion (11) onto a plane perpendicular to an imaginary line passing through the center of gravity (G) and the projection point (P) is in a range of 0.4 to 0.5. In addition, the upper limit of the ratio (H1/H) is preferably 0.45. The above wood-type golf club head (10) is controlled so that the projection point (P) is at a low position by thoroughly promoting low center of gravity. If the above ratio (H1/H) is outside the above range, it becomes difficult to realize low spin of the hit ball, and there is a concern that it becomes difficult to sufficiently increase the distance of the hit ball. In addition, the "height of the entire face" means the height of the entire face at a position corresponding to the projection point in the above projection image.

As shown in Fig. 1, the wood-type golf club head (10) is arranged on a horizontal plane so that the wood-type golf club head (10) has a predetermined lie angle and loft angle (a lie angle and a loft angle unique to the golf club head), and the distance (L1) between the center of gravity (G) and the leading edge (E) in the front-back direction is 30 mm or less. The upper limit of the front-back distance (L1) is preferably 27 mm. The wood-type golf club head (10) thoroughly achieves a shallow center of gravity by making the front-back distance (L1) equal to or less than the upper limit. The wood-type golf club head (10) controls the ratio (H1/H) within the above range by this shallow center of gravity. The lower limit of the front-back distance (L1) is not particularly limited, but may be, for example, 15 mm from the viewpoint of facilitating weight distribution of the entire golf club head. Additionally, the “leading edge” refers to an edge formed at the boundary between the face surface (11a) and the front surface of the sole (12).

As shown in Fig. 1, the wood-type golf club head (10) has a maximum length (L2) of the head main body (1) in the front-back direction of 80 mm or more when the wood-type golf club head (10) is placed on a horizontal plane so as to have a predetermined lie angle and loft angle. In general, when it is intended to achieve a shallow center of gravity of the wood-type golf club head, it is thought that it is effective to make the front-back direction length of the head main body small (i.e., to make the head main body flatter in the front-back direction than a conventional head main body). However, it is thought that a change in the shape of the head main body may cause a feeling of discomfort to the user, and in some cases, the swing trajectory may become disrupted. In contrast, the wood-type golf club head (10) achieves a shallow center of gravity while making the maximum length (L2) of the head main body (1) in the front-back direction greater than the lower limit, thereby suppressing changes in the appearance of the conventional golf club head. The upper limit of the above maximum length (L2) is not particularly limited, but can be, for example, 100 mm. Meanwhile, the above maximum length (L2) means a value measured with the leading edge (E) as the shear.

The lower limit of the head height of the head body (1) is preferably 40 mm. In addition, the lower limit of the maximum length of the head body (1) in the toe-heel direction is preferably 100 mm, and more preferably 120 mm. In the wood-type golf club head (10), there are cases where a large transverse moment of inertia is required from the viewpoint of increasing the directionality of the hit. In the wood-type golf club head (10), it is easy to increase the transverse moment of inertia by setting the head height and the maximum length in the toe-heel direction to be equal to or greater than the lower limit. In addition, the "head height" means the vertical distance between the top of the crown and the lowest point of the sole when the head is arranged on a horizontal plane so as to have a predetermined lie angle and loft angle. "Toe-heel direction" means the horizontal direction perpendicular to the front-back direction when the golf club head is placed on the horizontal plane so as to have a predetermined lie angle and loft angle. "Transverse moment of inertia" means the moment of inertia around the vertical axis passing through the center of gravity of the golf club head when the golf club head is placed on the horizontal plane so as to have a predetermined lie angle and loft angle.

<Head body>

The head body (1) has a first part (20) including a face part (11), and a second part (30) connected to the first part (20) and positioned at the rear of the first part (20). More specifically, the head body (1) is composed of the first part (20) and the second part (30). The specific gravity of the second part (30) is smaller than that of the first part (20). Since the head body (1) has the first part (20) and the second part (30), it is possible to easily shift the center of gravity (G) forward.

As an upper limit of the comparison of the specific gravity of the second portion to the specific gravity of the first portion (20), 0.6 is preferable, and 0.5 is more preferable. On the other hand, as a lower limit of the ratio, 0.18 is preferable, and 0.3 is more preferable. If the ratio exceeds the upper limit, there is a concern that it will be difficult to sufficiently achieve a shallow center of gravity of the wood-type golf club head (10). In addition, from the viewpoint of achieving a shallow center of gravity of the wood-type golf club head (10), it is also thought that the smaller the ratio is preferable. However, the wood-type golf club head (10) is intended to achieve a low center of gravity in addition to a shallow center of gravity. From the viewpoint of promoting a low center of gravity, there are cases where it is required to place a weight at a desired position of the first portion (20). At this time, if the specific gravity of the first part (20) is excessively large, it becomes difficult to place weight on the first part (20) from the viewpoint of suppressing the increase in the weight of the entire wood-type golf club head (10), etc. From this point of view, if the ratio does not meet the lower limit, there is a concern that it will be difficult to achieve low center of gravity due to the increase in the specific gravity of the first part (20).

(Part 1)

The first part (20) contributes to the low center of gravity and shallow center of gravity of the wood-type golf club head (10). As shown in Fig. 3, the first part (20) includes, in addition to the face part (11), the area in front of the sole part (12), the crown part (13), and the side part (14). That is, the first part (20) has a cylindrical shape with a bottom to which the sole part (12), the crown part (13), and a part of the side part (14) are connected around the face part (11). A weight (21) is arranged on the inner surface of the sole part (12). In addition, a neck part (2) is connected to the first part (20).

As the main component of the first part (20), metal is listed. Since the main component of the first part (20) is metal, the specific gravity of the first part (20) can be easily increased. As a result, it is easy to achieve a shallow center of gravity of the wood-type golf club head (10).

As the above metal, for example, titanium, stainless steel, maraging steel, aluminum, magnesium, etc. are enumerated. Among them, titanium is preferable as the above metal. Titanium has a specific gravity of 4.51, which is lower than the specific gravity of stainless steel, for example. Therefore, by making the main component of the first part (20) titanium, even when a weight (21) is arranged on the first part (20), the weight increase of the entire first part (20) can be suppressed. As a result, by distributing the weight of the first part (20) toward the sole (12) side, it becomes easy to achieve both a shallow center of gravity and a low center of gravity.

The weight (21) constitutes a part of the first part (20). The weight (21) is arranged on the inner surface of the sole (12) (more specifically, an area included in the first part (20) of the sole (12)) to promote low center of gravity of the wood-type golf club head (10). As a main component of the weight (21), a metal is enumerated. The weight (21) uses, for example, the same metal as the sole (12) and is formed integrally with the sole (12).

There is no particular limitation on the placement of the weight (21), but for example, the outer sides of the sole (12) in the toe and heel direction are preferable. With this configuration, it is easy to increase the transverse moment of inertia of the wood-type golf club head (10).

In a state where the wood-type golf club head (10) is arranged on a horizontal plane so as to have predetermined lie angles and loft angles, the first part (20) is installed to the rearward side relative to the center of gravity (G). It is preferable that the maximum length of the first part (20) in the front-back direction be smaller than the maximum length of the second part (30) in the front-back direction. By making the front-back length of the first part (20) small, it is easy to achieve a shallow center of gravity of the wood-type golf club head (10). In a state where the wood-type golf club head (10) is arranged on a horizontal plane so as to have predetermined lie angles and loft angles, the upper limit of the front-back direction length of the leading edge (E) and the rearmost end of the first part (20) is preferably, for example, 40 mm, more preferably 37 mm. In addition, the “rearmost end of the first part” means the rearmost end excluding the connecting portion (22) described below.

At the rear end of the first part (20), an annular connecting part (22) is installed. As shown in Fig. 4, the connecting part (22) functions as a step connected to the second part (30). The first part (20) and the second part (30) are bonded to each other, for example, through an adhesive tape (not shown in the drawing) placed on the connecting part (22).

(Part 2)

The second part (30) is installed to secure the length in the front-back direction of the head body (1). The wood-type golf club head (10) is designed to have a low center of gravity and a shallow center of gravity by the first part (20) and the neck part (2). The second part (30) is required to be lightweight so that it can sufficiently maintain the low center of gravity and the shallow center of gravity. Therefore, as shown in Fig. 5, it is preferable that no weights, such as weights or ribs, are placed on the second part (30).

It is preferable that the thickness of the second portion (30) is uniform. That is, from the viewpoint of reducing the weight, it is preferable that no unevenness due to protrusions or the like is formed on the second portion (30). The upper limit of the maximum thickness of the second portion (30) is not particularly limited, but may be, for example, 1.0 mm, and is preferably 0.8 mm. In addition, "uniform thickness" means that the ratio of the minimum thickness to the maximum thickness is 0.8 or more and 1.0 or less. In addition, the ratio is preferably 0.9 or more and 1.0 or less.

The second part (30) is composed mainly of a material other than metal. The main component of the second part (30) is not particularly limited as long as the specific gravity of the second part (30) can be reduced. However, from the viewpoint of achieving weight reduction while maintaining strength, the second part (30) preferably contains a fiber-reinforced resin. The fiber-reinforced resin has a resin matrix and fibers dispersed in the resin matrix. Examples of the fibers include carbon fibers, glass fibers, and the like. When the fibers are carbon fibers, the fiber-reinforced resin is composed of carbon fiber-reinforced plastic (CFRP). When the fibers are glass fibers, the fiber-reinforced resin is composed of glass fiber-reinforced plastic (GFRP). The fiber-reinforced resin is preferably CFRP. Since the fiber-reinforced resin is CFRP, it is easy to achieve both weight reduction and strength improvement. As the main component of the above resin matrix, thermosetting resins such as epoxy resin and unsaturated polyester, and thermoplastic resins such as polyolefin and polyamide are listed, for example.

The second part (30) may contain a fiber-reinforced resin and components other than the fiber-reinforced resin. However, the second part (30) is preferably composed only of the fiber-reinforced resin. By configuring it in this way, it is easy to promote weight reduction of the second part (30). In addition, when the second part (30) is composed only of the fiber-reinforced resin, for example, by using titanium as the main component of the first part (20), it is easy to control the weight distribution of the entire wood-type golf club head (10). As a result, it is easy to achieve a low center of gravity and a shallow center of gravity.

<Neckbu>

As described above, the neck portion (2) is connected to the first portion (20). The neck portion (2) contributes to the shallow center of gravity of the wood-type golf club head (10) by being connected to the first portion (20). As the main component of the neck portion (2), for example, a metal is enumerated. As the metal, for example, those exemplified as the main component of the first portion (20) are enumerated.

The above wood-type golf club head (10) aims to achieve a low center of gravity and a shallow center of gravity by concentrating the weight on the first portion (20) and the neck portion (2). For example, the above wood-type golf club head (10) is installed so that, when the wood-type golf club head (10) is placed on a horizontal plane so as to have a predetermined lie angle and loft angle, 80% or more of the total weight is placed within a range of 40 mm rearward from the leading edge (E).

<Advantages>

The wood-type golf club head (10) above has a height (H1) of a projection point (P) that vertically projects the center of gravity (G) of the wood-type golf club head (10) onto the face surface (11a) of 0.4 or more and 0.5 or less relative to the height (H) of the entire face portion (11), and further, when the wood-type golf club head (10) is placed on a horizontal plane so as to have predetermined lie angles and loft angles, the distance (L1) in the front-back direction between the center of gravity (G) of the wood-type golf club head (10) and the leading edge (E) is 30 mm or less, thereby thoroughly achieving low center of gravity and shallow center of gravity. Therefore, the wood-type golf club head (10) can realize low spin of a hit. The above wood-type golf club head (10) is designed to have a thorough low center of gravity and shallow center of gravity, and, when the wood-type golf club head (10) is placed on a horizontal plane so as to have a predetermined lie angle and loft angle, the maximum length (L2) of the head body (1) in the front-back direction is set to 80 mm or more. As a result, it is easy to obtain the desired appearance.

[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.

The above wood-type golf club head is not particularly limited in any other configuration as long as the height of the projection point of the center of gravity of the wood-type golf club head projected vertically onto the front surface of the face, the maximum length of the head body in the front-back direction, and the front-back distance between the center of gravity and the leading edge are controlled within the above-described ranges. For example, the wood-type golf club head may not have the first part and the second part described above. Furthermore, even if the above-described first part is provided, a weight need not be arranged in the first part.

When the above-described wood-shaped golf club head has the first and second parts as described above, the second part may have a plurality of regions made of different materials. For example, the second part may have a first region connected to the first part, and a second region arranged at the rear of the first region. In addition, when the second part has a plurality of regions, it is preferable that the specific gravity of the region arranged at the rear is smaller than that of the region arranged at the front (on the first part side). In addition, when the second part has a plurality of regions, the specific gravity of the second part can be obtained by dividing the volume of the entire second part by the weight of the entire second part.

(Industrial applicability)

As described above, the wood-type golf club head according to one embodiment of the present invention is suitable for achieving low spin of a hit ball.

1 Head body
2 neck part
10 wood type golf club head
11 Face
11a face side
12 Solbu
13 crown department
14 Side section
20 Part 1
21 weight
22 connector
30 Part 2
E Reading Edge
G center of gravity
P projection point
H Overall height of face
H1 Height of projection point
L1 The distance in the anterior and posterior directions between the center of gravity and the leading edge
Maximum length of the L2 head body in the forward and backward direction

Claims (7)

A wood-type golf club head having a hollow head body with a face,
The height of the projection point of the center of gravity of the wood-type golf club head projected vertically onto the face surface of the face portion in the direction along the face surface is 0.4 or more and 0.5 or less with respect to the height of the entire face portion in the direction along the face surface.
In a state where the above wood-type golf club head is placed on a horizontal plane so as to have a predetermined lie angle and loft angle,
The maximum length of the head body in the front-back direction is 80 mm or more,
A wood-type golf club head having a distance in the front-back direction between the center of gravity of the wood-type golf club head and the leading edge of less than 30 mm. In paragraph 1,
The head body has a first part including the face portion, and a second part connected to the first part and positioned at the rear of the first part,
A wood-type golf club head wherein the specific gravity of the second portion is less than that of the first portion. In the second paragraph,
A wood-type golf club head wherein the second part comprises a fiber-reinforced resin. In the third paragraph,
A wood-type golf club head wherein the second part is made only of fiber-reinforced resin. In any one of paragraphs 2 to 4,
A wood-type golf club head whose main component of the first part is metal. In paragraph 5,
A wood-type golf club head wherein the metal is titanium. In any one of paragraphs 2 to 4,
A wood-type golf club head, wherein the ratio of the specific gravity of the second portion to the specific gravity of the first portion is 0.18 or more and 0.6 or less.