Golf Club Head

Abstract

To provide a golf club head that can efficiently hit a golf ball, on a configuration of increasing a size and deepening a center of gravity of a head body.SOLUTION: A golf club head 10 includes: a hollow head body 1 including a face part 11 including a face surface 11a and a crown part 12 extending backward from an upper edge of the face part 11. The head body 1 has a volume of 440 cm3 or more. A height of a top part of the crown part 12 is 62 mm or more, a height difference between the top part of the crown part 12 and an upper end of the face surface 11a is 7 mm or more, a centroid depth of the head body 1 is 40 mm or more, and a lateral inertia moment is 4800 g cm2 or more while the head body 1 is disposed at a horizontal plane so as to take predetermined lie angle and loft angle.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a golf club head. [Background technology]

[0002] It is desirable for a golf club head having a hollow head body to have high ball hitting directionality. From this perspective, efforts are being made to increase the size of the golf club head and to move the center of gravity deeper, thereby increasing the lateral moment of inertia of the golf club head (see JP 2013-63341 A). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-63341 A Summary of the Invention [Problem to be solved by the invention]

[0004] The golf club head described in Patent Document 1 has a head volume of 300 cm 3 The lateral moment of inertia is increased by making the center of gravity deeper through the addition of a solid portion on the back face side.

[0005] On the other hand, if the volume of the head is increased and the center of gravity is moved deeper in order to increase the lateral moment of inertia, the center of gravity of the head tends to become higher. Therefore, when a golf ball is hit with this golf club head, the impact point is lower than the sweet spot where the center of gravity of the head is projected onto the face, which creates a problem that the golf ball cannot be hit efficiently.

[0006] The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide a golf club head that is capable of efficiently hitting a golf ball in a configuration that aims to increase the size of the head body and to move the center of gravity deeper. [Means for solving the problem]

[0007] A golf club head according to one embodiment of the present invention comprises a hollow head body having a face portion having a face surface and a crown portion extending rearward from an upper edge of the face portion, and the volume of the head body is 440 cm 3 or more, and in a state in which the head body is disposed on a horizontal plane so as to have a predetermined lie angle and loft angle, the height of the top of the crown portion is 62 mm or more, the height difference between the top of the crown portion and the upper end of the face surface is 7 mm or more, the depth of the center of gravity of the head body is 40 mm or more, and the lateral moment of inertia is 4800 g cm 2 That's all.

[0008] The roll radius of the face surface is preferably 240 mm or less.

[0009] It is preferable that the crown portion contains a non-metallic material having a specific gravity of 2.1 or less, and that the content of the non-metallic material in the crown portion is 70 volume % or more.

[0010] The non-metallic material may be a fiber-reinforced resin.

[0011] When the head body is placed on a horizontal plane to have a predetermined lie angle and loft angle, the ratio of the height difference between the top of the crown portion and the upper end of the face surface to the height of the upper end of the face surface may be 0.10 or more and 0.25 or less.

[0012] In the present invention, "front" means the side where the golf ball is hit, and "rear" means the opposite side. "Center of gravity depth" means the distance between the center of gravity of the head body and the leading edge in the front-rear direction. "Horizontal moment of inertia" means the moment of inertia about the vertical axis passing through the center of gravity of the golf club head when the head body is placed on a horizontal plane so as to have a preset lie angle and loft angle. "Roll radius of face surface" means the radius of curvature in the up-down direction of the face surface at the center position between both ends of the face surface in the toe-heel direction. When there are two or more radii of curvature in the up-down direction at the center position, the roll radius means the average value of these radii of curvature. "Toe-heel direction" means the horizontal direction perpendicular to the front-rear direction when the head body is placed on a horizontal plane so as to have a preset lie angle and loft angle. Effect of the Invention

[0013] The golf club head according to one aspect of the present invention has a lateral moment of inertia of 4800 g cm 2 In order to achieve the above, the volume of the head body is set to 440 cm 3 Furthermore, the depth of the center of gravity of the head body is set to 40 mm or more. That is, the golf club head is made larger and has a deeper center of gravity in order to increase the lateral moment of inertia. In this configuration, the golf club head can guide the impact point of the golf ball upward for the user by increasing the height of the top of the crown and increasing the height difference between the top of the crown and the upper end of the face. As a result, the golf club head can efficiently hit the golf ball. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic side view of a golf club head according to one embodiment of the present invention as viewed from the toe side. [Diagram 2] FIG. 2 is a schematic front view of the golf club head of FIG. [Diagram 3]FIG. 3 is a schematic plan view of the golf club head of FIG. [Figure 4] FIG. 4 is a schematic perspective view showing a state in which the opening of the crown portion of the golf club head of FIG. 1 is open. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings as appropriate. Note that, for the numerical values ​​described in this specification, only one of the upper limit value and the lower limit value described may be adopted, or the upper limit value and the lower limit value may be arbitrarily combined.

[0016] [Golf club head] 1 to 4 is a wood-type golf club head. Examples of wood-type golf club heads include drivers, utilities, fairway woods, etc. The golf club head 10 is particularly preferably used as a driver among wood-type golf club heads.

[0017] The golf club head 10 includes a hollow head body 1, and more specifically, consists of the head body 1. The head body 1 includes a face portion 11 having a face surface 11a, and a crown portion 12 extending rearward from the upper edge of the face portion 11. The head body 1 also includes a sole portion 13 extending rearward from the lower edge of the face portion 11, side portions 14 extending rearward from the toe-side and heel-side edges of the face portion 11 and disposed between the crown portion 12 and the sole portion 13, and a shaft attachment portion 15 to which a shaft is attached. The face surface 11a constitutes the front surface of the face portion 11. The face surface 11a constitutes the striking surface of the golf club head 10.

[0018] The lower limit of the volume of the head body 1 is 440 cm 3 and 445cm 3 is preferred, and 450 cm 3is more preferable. If the volume does not meet the lower limit, the lateral moment of inertia of the golf club head 10 may not be sufficiently large. Also, if the volume does not meet the lower limit, it may be difficult to make the height of the crown portion 12 sufficiently large, as described below. The upper limit of the volume is not particularly limited, and can be set based on rules and other constraints. The upper limit of the volume is, for example, 470 cm. 3 The "volume of the head body" means the volume of the face, crown, sole, and side parts plus the shaft attachment part (if the shaft attachment part is long, the base part of the shaft attachment part). This volume can be measured in accordance with, for example, "The Equipment Rules" (Japanese version 2.1) that came into effect on January 1, 2020.

[0019] As shown in Fig. 1, the lower limit of the depth D of the center of gravity of the head body 1 when the head body 1 is placed on a horizontal plane to have a predetermined lie angle and loft angle is 40 mm, preferably 43 mm, and more preferably 45 mm. If the depth D of the center of gravity is less than the lower limit, the lateral moment of inertia of the golf club head 10 may not be sufficiently large. The upper limit of the depth D of the center of gravity is not particularly limited, but may be, for example, 64 mm.

[0020] As described above, the golf club head 10 has a large lateral moment of inertia by increasing the volume of the head body 1 and deepening the depth of the center of gravity of the head body 1. The lower limit of the lateral moment of inertia of the golf club head 10 is set to 4800 g cm 2 and 4900 g cm 2 is preferred, and 5000 g cm 2 If the lateral moment of inertia is less than the lower limit, the directionality of the hit ball may not be improved sufficiently. The upper limit of the lateral moment of inertia is not particularly limited, but is preferably 6000 g cm 2 It can be said that:

[0021] The golf club head 10 is likely to have a high center of gravity G of the head body 1 due to the large volume of the head body 1 and the deep center of gravity of the head body 1. On the other hand, the user of the golf club head 10 tends to swing with the intention of hitting the golf ball at the center of the face surface 11a. Therefore, when the user hits the golf ball at a desired position, the hit is made at a part below the projection point G1 of the center of gravity G of the head body 1 projected in the normal direction of the face surface 11a, and the hit ball is backspinned, making it difficult to achieve a sufficient flight distance. In response to the new problem caused by the large size and deep center of gravity of the head body 1, the inventor has earnestly studied how to guide the hitting point of the face surface 11a upward by utilizing the sense of distance perceived by the user with respect to the golf club head 10 so that it is easy to hit the ball near the projection point G1. As a result, it was discovered that by intentionally protruding the crown portion 12 upward, the user is given an illusion of the height position of the center of the face surface 11a (the user is given the illusion that the center of the face surface 11a is located higher than its actual height position), and the impact point can be unconsciously guided upward (near the projection point G1).

[0022] From this viewpoint, as shown in Figs. 1 and 2, the lower limit of the height H1 of the top of the crown portion 12 when the head body 1 is placed on a horizontal plane to have a predetermined lie angle and loft angle is 62 mm, preferably 63 mm, and more preferably 65 mm. If the height H1 does not meet the lower limit, it may be difficult to guide the impact point to the vicinity of the projection point G1. The upper limit of the height H1 may be, for example, 72 mm from the viewpoint of not giving a sense of discomfort to the user. In the present invention, when the term "height" is used simply, it means the height based on the horizontal plane.

[0023] 1 and 2, the lower limit of the height difference H2 between the top of the crown portion 12 and the upper end of the face surface 11a when the head body 1 is placed on a horizontal plane to have a predetermined lie angle and loft angle is 7 mm, preferably 8 mm, and more preferably 9 mm. If the height difference H2 does not meet the lower limit, it may be difficult to guide the impact point to the vicinity of the projection point G1. The upper limit of the height difference H2 may be, for example, 18 mm from the viewpoint of not giving a sense of discomfort to the user.

[0024] In a state where the head body 1 is arranged on a horizontal plane to have a predetermined lie angle and loft angle, the lower limit of the ratio (H2 / H3) of the height difference H2 between the top of the crown portion 12 and the top end of the face surface 11a to the height H3 of the top end of the face surface 11a is preferably 0.10, more preferably 0.15. On the other hand, the upper limit of the ratio (H2 / H3) is preferably 0.25, more preferably 0.20. It is desired that the golf club head 10 can guide the impact point to the vicinity of the projection point G1 while suppressing discomfort to the user. In this regard, if the ratio (H2 / H3) is less than the lower limit, it may be difficult to guide the impact point to the vicinity of the projection point G1. Conversely, if the ratio (H2 / H3) exceeds the upper limit, it may be more likely to cause discomfort to the user, and the effect of increasing the height H1 of the top of the crown portion 12 may be difficult to achieve.

[0025] It is preferable that the face surface 11a is curved forwardly convexly in the up-down direction. By curving the face surface 11a in this manner, when the user holds the golf club head 10, the lower part of the face surface 11a is difficult to be seen by the user. At the same time, this configuration shifts the position of the face surface 11a seen by the user upward. As a result, the user can be given an illusion of a sense of distance from the face surface 11a, and the impact point of the face surface 11a can be guided upward.

[0026] The upper limit of the roll radius of the face surface 11a (the radius of curvature of the virtual curve C along the face surface 11a in FIG. 1) is preferably 240 mm, more preferably 220 mm. If the roll radius exceeds the upper limit, the effect of guiding the impact point of the face surface 11a upward may be difficult to achieve. The lower limit of the roll radius is not particularly limited, but may be, for example, 120 mm from the viewpoint of suppressing discomfort to the user.

[0027] The ratio of the height of the projection point G1 to the height H3 of the upper end of the face surface 11a can be 0.5 or more and 0.7 or less, and may be 0.55 or more and 0.7 or less. In this golf club head 10, in a configuration in which the projection point G1 is located above the center of the face surface 11a, the golf ball can be efficiently hit.

[0028] (Crown part) As described above, the crown portion 12 protrudes upward. More specifically, the outer surface of the crown portion 12 is curved upward from the front to the rear in an arch shape. In this way, the curved outer surface of the crown portion 12 can prevent the user from feeling uncomfortable. The overall shape of the outer surface of the crown portion 12 is not particularly limited as long as the height of the apex can be ensured, but an upwardly convex dome shape is preferable. In other words, the outer surface of the crown portion 12 is preferably curved upward from the front to the rear in an arch shape and also in the toe-heel direction. This configuration makes it easy to increase the overall height of the crown portion 12 while suppressing discomfort to the user. As a result, the protruding shape of the crown portion 12 is used to easily give the user an illusion of the height position of the center of the face surface 11a.

[0029] The material of the golf club head 10 is not particularly limited, and metals such as titanium, stainless steel, maraging steel, aluminum, and magnesium can be used. On the other hand, in the golf club head 10, since the crown portion 12 is protruded upward, if a metal is used as the material of the crown portion 12, the center of gravity G of the head body 1 may shift further upward. Therefore, from the viewpoint of fully exerting the effect of guiding the impact point of the face surface 11a upward by maintaining the height of the projection point G1, it is preferable that the crown portion 12 contains a material with a low specific gravity. Such a material with a low specific gravity is a nonmetallic material with a specific gravity of 2.1 or less. That is, as shown in FIG. 3, the crown portion 12 preferably contains a nonmetallic plate 12a formed of a nonmetallic material with a specific gravity of 2.1 or less.

[0030] In the golf club head 10, the non-metallic plate 12a constitutes a protruding portion of the crown portion 12. In other words, the non-metallic plate 12a is provided at a position including the top of the crown portion 12.

[0031] 4, the golf club head 10 is provided with an opening 20a for disposing the non-metallic plate 12a in the crown portion 12. An annular connecting portion 20b is provided on the periphery of the opening 20a, which is disposed at a step below the adjacent portion so that the non-metallic plate 12a can be supported from below. The connecting portion 20b functions as a joint that is connected to the non-metallic plate 12a.

[0032] The lower limit of the content of the non-metallic material in the crown portion 12 is preferably 70 volume %, and more preferably 80 volume %. If the content is less than the lower limit, it may be difficult to sufficiently reduce the weight of the crown portion 12. The upper limit of the content is not particularly limited, and may be, for example, 100 volume %.

[0033] The non-metallic material is preferably a fiber-reinforced resin, which makes it easier to reduce the weight of the crown portion 12 and to prevent a decrease in the strength of the crown portion 12.

[0034] 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). The fiber reinforced resin is preferably CFRP. When the fiber reinforced resin is CFRP, both weight reduction and strength improvement can be easily achieved. 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. In this specification, the term "main component" refers to the component with the largest content in terms of mass, for example, a component with a content of 50 mass% or more.

[0035] <Advantages> The golf club head 10 has a lateral moment of inertia of 4800 g cm 2 In order to achieve the above, the volume of the head body 1 is set to 440 cm 3 Furthermore, the depth of the center of gravity of the head body 1 is set to 40 mm or more. That is, the golf club head 10 is made larger and has a deeper center of gravity in order to increase the lateral moment of inertia. In this configuration, the golf club head 10 can guide the impact point of the golf ball upward for the user by increasing the height of the top of the crown portion 12 and increasing the height difference between the top of the crown portion 12 and the upper end of the face surface 11a. As a result, the golf club head 10 can efficiently hit the golf ball.

[0036] [Other embodiments] The above-described embodiments do not limit the configuration of the present invention. Therefore, the above-described embodiments may include omissions, substitutions, or additions of components of each part of the embodiments based on the description in this specification and common general technical knowledge, and all of these should be interpreted as falling within the scope of the present invention.

[0037] For example, if the impact point can be guided to the vicinity of the projection point by controlling the height of the top of the crown, the crown may be mainly made of metal. The material of the parts of the golf club head other than the crown is not particularly limited. For example, the face, sole, side and shaft attachment parts of the golf club head may all be mainly made of metal.

[0038] The non-metallic material may be other than fiber-reinforced resin. For example, synthetic resin may be used as the non-metallic material. However, when synthetic resin is used as the non-metallic material, it is preferable to use it in combination with fiber-reinforced resin from the viewpoint of suppressing a decrease in strength. [Industrial Applicability]

[0039] As described above, a golf club head according to one aspect of the present invention is suitable for increasing the flight distance of a hit ball while improving the directionality of the hit ball. [Explanation of symbols]

[0040] 1 Head body 10. Golf club head 11 Face section 11a Face 12 Crown section 12a Non-metallic plate 13 Sole 14 Side section 15 Shaft mounting part 20a opening 20b Connection C The position including the projection point of the center of gravity of the head body in the normal direction of the face surface. A virtual curve that extends vertically along the base surface. D Depth of center of gravity of head body G Center of gravity of head body G1: Projection point of the center of gravity of the head body in the normal direction of the face surface H1 Height of the top of the crown H2 Height difference between the top of the crown and the top of the face H3 Height of the top of the face

Claims

1. a hollow head body having a face portion having a face surface and a crown portion extending rearward from an upper edge of the face portion; The volume of the head body is 440 cm ３ That's all. In a state where the head body is disposed on a horizontal plane so as to have a predetermined lie angle and loft angle, The height of the top of the crown portion is 62 mm or more, The height difference between the top of the crown portion and the upper end of the face surface is 7 mm or more, The depth of the center of gravity of the head body is 40 mm or more, Lateral moment of inertia is 4800g cm ２ That's all. The crown portion includes a nonmetallic material having a specific gravity of 2.1 or less, A golf club head, wherein the content of the non-metallic material in the crown portion is 70 volume % or more.

2. 2. The golf club head according to claim 1, wherein the roll radius of the face surface is 240 mm or less.

3. 3. The golf club head according to claim 1, wherein the non-metallic material is a fiber-reinforced resin.

4. In a state where the head body is disposed on a horizontal plane so as to have a predetermined lie angle and loft angle, 4. The golf club head according to claim 1, wherein a ratio of a height difference between a top of the crown portion and an upper end of the face surface to a height of the upper end of the face surface is 0.10 or more and 0.25 or less.

Images