JP2022136423A - Wood-type golf club head - Google Patents

Abstract

To provide a wood-type golf club head that can materialize low-spin of a shot ball.SOLUTION: A wood-type golf club head 10 concerning one embodiment of the present invention comprises a hollow head body 1 having a face portion 11. A height H1 of a projection point P obtained by vertically projecting the gravity center G of the wood-type golf club head 10 on a front surface of the face portion 11 is 0.4 or more and 0.5 or less to the height H of the whole face portion 11. A longitudinal maximum length L2 of the head body 1 is 80 mm or more, and a longitudinal direction distance L1 between the gravity center G and the leading edge E of the wood-type golf club head is 30 mm or less with the wood-type golf club head 10 arranged on the horizontal plane in such a way as to become a predetermined lie angle and a loft angle.SELECTED DRAWING: Figure 1

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 increase the flight distance of a hit ball.

To increase the flight distance of a hit ball, it is effective to achieve a low spin rate of the hit ball. From this point of view, the wood-type golf club head is required to lower the position of the projection point obtained by vertically projecting the center of gravity of the entire head onto the front surface of the face portion. 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 "lowering the center of gravity"). (Yes, shifting the center of gravity of the golf club head forward is also called "lower center of gravity.")

Conventionally, as a technique for lowering the center of gravity of a golf club head, arranging a weight material in the sole portion has been performed (see Patent Document 1).

Japanese Patent Application Laid-Open No. 2010-234108 JP-A-2005-6835

However, when the technique described in Patent Document 1 is used, it is difficult to sufficiently reduce the center of gravity of the golf club head.

Patent Document 2 describes that a fiber-reinforced resin body having a lower specific gravity than metal is used for a part of the golf club head. Patent Literature 2 describes that by using a fiber-reinforced resin body for a part of the golf club head, it becomes possible to allocate weight to the sole plate and the weight material arranged at the rear portion of the sole plate. However, Patent Literature 2 merely describes the use of a fiber-reinforced resin body in order to suppress the weight increase of the entire golf club head, and does not describe shallowing the center of gravity of the golf club head.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wood-type golf club head capable of achieving low spin on a hit ball.

A wood-type golf club head according to one aspect of the present invention, which has been made to solve the above-described problems, is a wood-type golf club head including a hollow head body having a face portion. The height of the projection point obtained by vertically projecting the center of gravity 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 the wood-type golf club head has a predetermined lie angle and a predetermined lie angle. The maximum longitudinal length of the head body is 80 mm or more, and the distance between the center of gravity and the leading edge of the wood-type golf club head in the longitudinal direction is 30 mm or less when placed on a horizontal plane so as to form a loft angle. .

The head body has a first portion including the face portion, and a second portion connected to the first portion and arranged behind the first portion, and the specific gravity of the second portion is It is preferably smaller than the specific gravity of the first portion.

The second portion preferably contains a fiber-reinforced resin.

It is preferable that the second portion is made only of fiber-reinforced resin.

A main component of the first portion is preferably a metal.

The metal is preferably 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 the present invention, "front" means the hitting side, and "rear" means the opposite side. A "main component" means a component having the largest content in terms of mass, for example, a component having a content of 50% by mass or more.

In the wood-type golf club head according to an aspect of the present invention, the height of the 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 0.00 to the height of the entire face portion. 4 or more and 0.5 or less, and the front-rear direction between the center of gravity of the wood-type golf club head and the leading edge when the wood-type golf club head is placed on a horizontal plane so as to have a predetermined lie angle and loft angle. By keeping the distance to 30 mm or less, the center of gravity is thoroughly lowered and shallowed. Therefore, the wood-type golf club head can realize a low spin rate of a hit ball. The wood-type golf club head has a low center of gravity and a shallow center of gravity. has a maximum length of 80 mm or more in the front-rear direction. As a result, it is easy to obtain the desired appearance.

FIG. 1 is a schematic side view of a wood-type golf club head according to an embodiment of the present invention, viewed from the toe side. 2 is a schematic plan view of the wood-type golf club head of FIG. 1. FIG. 3 is a schematic perspective view showing a first portion of the wood-type golf club head of FIG. 1. FIG. 4 is a schematic cross-sectional view showing a connecting portion between the first portion and the second portion of the wood-type golf club head of FIG. 1. FIG. 5 is a schematic cross-sectional view taken along the line VV showing the second portion of the wood-type golf club head of FIG. 1. 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.

[Golf club head]
A wood-type golf club head 10 of FIGS. 1 and 2 includes a hollow head body 1 having a face portion 11 . The wood-type golf club head 10 also includes a neck portion 2 into which a shaft (not shown) is inserted. The head body 1 includes a sole portion 12 extending rearward from the lower edge of the face portion 11 , a crown portion 13 extending rearward from the upper edge of the face portion 11 , and side edges on the toe side and heel side of the face portion 11 . and a side portion 14 extending rearwardly from and disposed between the sole portion 12 and the crown portion 13 . The front surface of the face portion 11 constitutes the striking surface of the wood-type golf club head 10 (hereinafter, the front surface of the face portion is also referred to as "face surface 11a").

As shown in FIG. 1, the wood-type golf club head 10 has 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 (that is, the face surface 11a). , the height H of the entire face portion 11 is 0.4 or more and 0.5 or less. In other words, the ratio ( H1/H) is 0.4 or more and 0.5 or less. Further, the upper limit of the ratio (H1/H) is preferably 0.45. The wood-type golf club head 10 controls the projection point P to be at a low position by making the center of gravity extremely shallow. If the ratio (H1/H) is outside the above range, it may be difficult to achieve a low spin rate of the hit ball, and it may be difficult to sufficiently increase the flight distance of the hit ball. The "height of the entire face portion" means the height of the entire face portion at a position corresponding to the projection point in the projection image.

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

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. Length L2 is 80 mm or more. In general, when it is intended to make the center of gravity of a wood-type golf club head shallower, the length of the head body in the front-rear direction is reduced (that is, the head body is made flatter in the front-rear direction than the conventional head body). ) is considered to be effective. However, the change in the shape of the head body gives the user a sense of discomfort, and in some cases, the trajectory of the swing may be disturbed. On the other hand, the wood-type golf club head 10 has a shallow center of gravity and the maximum length L2 of the head body 1 in the longitudinal direction is equal to or greater than the lower limit. is suppressed. Although the upper limit of the maximum length L2 is not particularly limited, it can be set to 100 mm, for example. The maximum length L2 means a value measured with the leading edge E as the front end.

The lower limit of the head height of the head body 1 is preferably 40 mm. The lower limit of the maximum length in the toe-heel direction of the head body 1 is preferably 100 mm, more preferably 120 mm. The wood-type golf club head 10 is sometimes desired to have a large lateral moment of inertia from the viewpoint of enhancing the directivity of a hit ball. In the wood-type golf club head 10, the lateral moment of inertia can be easily increased by setting the head height and the maximum length in the toe-heel direction to the lower limits or more. The "head height" means the vertical distance between the apex of the crown and the lowest point of the sole when the golf club is placed on a horizontal plane so as to have a predetermined lie angle and loft angle. The "toe-heel direction" means a horizontal direction perpendicular to the front-rear direction in a state of being arranged on a horizontal plane so as to have a predetermined lie angle and loft angle. "Lateral moment of inertia" means the moment of inertia about the vertical axis passing through the center of gravity of the golf club head when placed on a horizontal plane so as to have a predetermined lie angle and loft angle.

<Head body>
The head body 1 has a first portion 20 including the face portion 11 and a second portion 30 connected to the first portion 20 and arranged behind the first portion 20 . More specifically, the head body 1 consists of a first portion 20 and a second portion 30 . The specific gravity of the second portion 30 is smaller than the specific gravity of the first portion 20 . Since the head body 1 has the first portion 20 and the second portion 30, the center of gravity G can be easily shifted forward.

The upper limit of the ratio of the specific gravity of the second portion to the specific gravity of the first portion 20 is preferably 0.6, more preferably 0.5. On the other hand, the lower limit of the ratio is preferably 0.18, more preferably 0.3. If the ratio exceeds the upper limit, it may be difficult to make the center of gravity of the wood-type golf club head 10 sufficiently shallow. From the viewpoint of making the center of gravity of the wood-type golf club head 10 shallower, the smaller the ratio, the better. However, the wood-type golf club head 10 intends 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, it may be desired to arrange the weight at a desired position of the first portion 20 . At this time, if the specific gravity of the first portion 20 is too large, it becomes difficult to place a weight on the first portion 20 from the viewpoint of suppressing an increase in the weight of the wood-type golf club head 10 as a whole. Under these circumstances, if the ratio is less than the lower limit, the specific gravity of the first portion 20 increases, which may make it difficult to lower the center of gravity.

(Part 1)
The first portion 20 contributes to lowering and shallowing the center of gravity of the wood-type golf club head 10 . As shown in FIG. 3 , the first portion 20 includes, in addition to the face portion 11 , regions in front of the sole portion 12 , the crown portion 13 and the side portions 14 . That is, the first portion 20 has a bottomed tubular shape in which parts of the sole portion 12 , the crown portion 13 and the side portions 14 are connected to the periphery of the face portion 11 . A weight 21 is arranged on the inner surface of the sole portion 12 . Also, the neck portion 2 is connected to the first portion 20 .

A main component of the first portion 20 is a metal. Since the main component of the first portion 20 is metal, the specific gravity of the first portion 20 can be easily increased. As a result, the center of gravity of the wood-type golf club head 10 can be easily made shallower.

Examples of the metal include titanium, stainless steel, maraging steel, aluminum, and magnesium. Among them, titanium is preferable as the metal. Titanium has a specific gravity of 4.51, which is lower than that of stainless steel, for example. Therefore, by using titanium as the main component of the first portion 20 , even when the weight 21 is arranged on the first portion 20 , the weight increase of the entire first portion 20 can be suppressed. As a result, by unevenly distributing the weight of the first portion 20 toward the sole portion 12 side, it becomes easier to achieve both a shallow center of gravity and a low center of gravity.

The weight 21 forms part of the first portion 20 . The weight 21 is arranged on the inner surface of the sole portion 12 (more specifically, a region included in the first portion 20 of the sole portion 12), thereby promoting a low center of gravity of the wood-type golf club head 10. do. A main component of the weight 21 is metal. The weight 21 is formed integrally with the sole portion 12 using, for example, the same metal as the sole portion 12 .

Although the arrangement of the weights 21 is not particularly limited, for example, both outer sides in the toe-heel direction of the sole portion 12 are preferable. With this configuration, it is easy to increase the lateral moment of inertia of the wood-type golf club head 10 .

The first portion 20 is provided to the rear of the center of gravity G in a state in which the wood-type golf club head 10 is arranged on a horizontal plane so as to have a predetermined lie angle and loft angle. The maximum longitudinal length of the first portion 20 is preferably smaller than the maximum longitudinal length of the second portion 30 . By reducing the length of the first portion 20 in the front-rear direction, it is easy to make the center of gravity of the wood-type golf club head 10 shallower. The upper limit of the longitudinal length between the leading edge E and the rearmost end of the first portion 20 when the wood-type golf club head 10 is arranged on a horizontal plane so as to have a predetermined lie angle and loft angle is, for example, 40 mm. Preferably, 37 mm is more preferred. In addition, "the rearmost end of the first portion" means the rearward end excluding the connecting portion 22 described later.

An annular connecting portion 22 is provided at the rear end portion of the first portion 20 . As shown in FIG. 4 , the connection 22 functions as a passage that connects with the second portion 30 . The first part 20 and the second part 30 are adhered to each other, for example, via an adhesive tape (not shown) arranged on the connecting part 22 .

(Part 2)
The second portion 30 is provided to secure the length of the head body 1 in the front-rear direction. The wood-type golf club head 10 achieves a low and shallow center of gravity by the first portion 20 and the neck portion 2 . The second portion 30 is desired to be light enough to maintain the low and shallow center of gravity. Therefore, as shown in FIG. 5, it is preferable that heavy objects such as weights and ribs are not arranged on the second portion 30 .

The thickness of the second portion 30 is preferably uniform. That is, from the viewpoint of lightening the weight, it is preferable that the second portion 30 is not formed with unevenness caused by projections or the like. The upper limit of the maximum thickness of the second portion 30 is not particularly limited, but may be, for example, 1.0 mm, 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. Moreover, as said ratio, 0.9-1.0 is preferable.

The second portion 30 is mainly composed of a material other than metal. The main component of the second portion 30 is not particularly limited as long as the specific gravity of the second portion 30 can be reduced. However, the second portion 30 preferably contains a fiber-reinforced resin from the viewpoint of maintaining strength while reducing weight. The fiber reinforced resin has a resin matrix and fibers dispersed in the resin matrix. Examples of the fibers include carbon fibers and glass fibers. When the fibers are carbon fibers, the fiber reinforced resin is configured as carbon fiber reinforced plastic (CFRP). When the fibers are glass fibers, the fiber reinforced resin is configured as glass fiber reinforced plastic (GFRP). CFRP is preferable as the fiber-reinforced resin. By using CFRP as the fiber-reinforced resin, it is easy to achieve both weight reduction and strength improvement. Examples of the main component of the resin matrix include thermosetting resins such as epoxy resins and unsaturated polyesters, and thermoplastic resins such as polyolefins and polyamides.

The second portion 30 may contain a fiber reinforced resin and components other than the fiber reinforced resin. However, it is preferable that the second portion 30 is made only of the fiber-reinforced resin. Such a configuration facilitates weight reduction of the second portion 30 . When the second portion 30 is made of only the fiber-reinforced resin, the weight distribution of the entire wood-type golf club head 10 can be easily adjusted by using titanium as the main component of the first portion 20, for example. As a result, it is easy to achieve a low and shallow center of gravity.

<Neck part>
As mentioned above, the neck 2 is connected to the first portion 20 . By being connected to the first portion 20 , the neck portion 2 contributes to shallowing the center of gravity of the wood-type golf club head 10 . A main component of the neck portion 2 is, for example, metal. Examples of the metal include those exemplified as the main component of the first portion 20 .

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

<Advantages>
In the wood-type golf club head 10, the height H1 of the projection point P obtained by vertically projecting the center of gravity G of the wood-type golf club head 10 onto the face surface 11a is 0.4 or more with respect to the height H of the entire face portion 11. 0.5 or less, and the distance between the center of gravity G of the wood-type golf club head 10 and the leading edge E 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. By setting the distance L1 in the front-rear direction to 30 mm or less, the center of gravity is thoroughly lowered and shallowed. Therefore, the wood-type golf club head 10 can realize a low spin of a hit ball. The wood-type golf club head 10 has a thoroughly low center of gravity and a shallow center of gravity. The maximum length L2 of the main body 1 in the front-rear direction is set to 80 mm or more. As a result, it is easy to obtain the desired appearance.

[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.

The wood-type golf club head has a height of the projection point of the center of gravity of the wood-type golf club head vertically projected onto the front surface of the face portion, a maximum longitudinal length of the head body, and a distance between the center of gravity and the leading edge. Other configurations are not particularly limited as long as the directional distance is controlled within the aforementioned range. For example, the wood-type golf club head may not have the aforementioned first portion and second portion. Further, even when the above-described first portion is provided, the weight may not be arranged on the first portion.

When the wood-type golf club head has the aforementioned first portion and second portion, the second portion may have multiple regions of different materials. For example, the second portion may have a first region connected to the first portion and a second region arranged behind the first region. In addition, when the second portion has a plurality of regions, it is preferable that the specific gravity of the region arranged on the rear side is smaller than that of the region arranged on the front side (first portion side). Moreover, when the second portion has a plurality of regions, the specific gravity of the second portion can be obtained by dividing the volume of the entire second portion by the weight of the entire second portion.

INDUSTRIAL APPLICABILITY As described above, the wood-type golf club head according to one aspect of the present invention is suitable for reducing the spin rate of a hit ball.

1 head body 2 neck portion 10 wood type golf club head 11 face portion 11a face surface 12 sole portion 13 crown portion 14 side portion 20 first portion 21 weight 22 connection portion 30 second portion E leading edge G center of gravity P projected point H face Height of the entire head H1 Height of projection point L1 Distance in the longitudinal direction between the center of gravity and the leading edge L2 Maximum length in the longitudinal direction of the head body

Claims (7)

A wood-type golf club head including a hollow head body having a face portion,
the 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;
In a state in which the wood-type golf club head is arranged on a horizontal plane so as to have a predetermined lie angle and loft angle,
The maximum length in the front-rear direction of the head body is 80 mm or more,
A wood-type golf club head, wherein the distance in the longitudinal direction between the center of gravity of the wood-type golf club head and the leading edge is 30 mm or less. The head body has a first portion including the face portion, and a second portion connected to the first portion and arranged behind the first portion,
2. The wood-type golf club head of claim 1, wherein the specific gravity of said second portion is less than the specific gravity of said first portion. 3. The wood-type golf club head of claim 2, wherein said second portion comprises a fiber reinforced resin. 4. The wood-type golf club head according to claim 3, wherein the second portion is made of fiber-reinforced resin only. 5. The wood-type golf club head of claim 2, 3 or 4, wherein the main component of the first portion is metal. 6. The wood-type golf club head of claim 5, wherein said metal is titanium. The wood-type golf club head according to any one of claims 2 to 6, wherein a 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.

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