Golf club head

Abstract

To improve the hitting sound of a golf club head.SOLUTION: The golf club head includes a face portion, the face portion including a first portion made of a first material and a second portion made of a second material and joined to one side of the first portion in a thickness direction of the first portion, the first material having a bulk density equal to or less than 3g / cm3, the second material having a bulk density greater than the bulk density of the first material and equal to or less than 9g / cm3, a surface of the second portion opposite to the first portion serving as a striking surface, the second portion includes a groove recessed relative to the hitting surface.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] Conventionally, golf club heads with a laminated structure equipped with a cover face that covers the face surface of the face portion have been proposed. Examples of materials for the face portion include metal materials, fiber-reinforced resin materials, or a combination of metal materials and fiber-reinforced resin materials, and examples of materials for the cover face include resin materials or fiber-reinforced resin materials with a durometer hardness of A98 or higher. Depending on the material of the cover face, the impact sound when hitting a golf ball changes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-169675 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to improve the hitting sound of a golf club head. [Means for solving the problem]

[0005] The golf club head has a face portion, the face portion including a first portion made of a first material and a second portion made of a second material and joined to one side of the first portion in a thickness direction, and the density of the first material is 1.3 g / cm 3 and the density of the second material is greater than the density of the first material and is 2.9 g / cm or less. 3 The second portion has a surface opposite to the first portion as a striking surface, and the second portion has a groove recessed into the striking surface. [Effects of the Invention]

[0006] According to the disclosed technology, it is possible to improve the hitting sound of the golf club head. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a perspective view illustrating a golf club head 1 according to a first embodiment. [Figure 2] 1 is a front view illustrating a golf club head 1 according to a first embodiment. [Figure 3] FIG. 3 is a front view of FIG. 2 with the second portion 12 removed. [Figure 4] 1 is a cross-sectional view illustrating a golf club head 1 according to a first embodiment. [Figure 5] FIG. 2 is a partially enlarged view of the face portion 10 as viewed from the striking surface side. [Figure 6] FIG. 1 is a bottom view illustrating a golf club head 1A according to a first modified example of the first embodiment. [Figure 7] FIG. 1 is a cross-sectional view illustrating a golf club head 1A according to a first modified example of the first embodiment. [Figure 8] 1 is a partial cross-sectional view of the vicinity of the mounting portion 301 and the weight adjustment part 302. FIG. [Figure 9] FIG. 2 is a partial cross-sectional view of the vicinity of the hosel portion 50. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, the embodiments will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description may be omitted.

[0009] First Embodiment Fig. 1 is a perspective view illustrating a golf club head 1 according to a first embodiment. Fig. 2 is a front view illustrating the golf club head 1 according to the first embodiment. Fig. 3 is a front view from Fig. 2 with a second portion 12 removed. Fig. 4 is a cross-sectional view illustrating the golf club head 1 according to the first embodiment. In Figs. 1 to 4, arrow d1 indicates the toe-heel direction (left-right direction), arrow d2 indicates the crown-sole direction (up-down direction), and arrow d3 indicates the face-back direction (front-rear direction).

[0010] The crown-sole direction is the vertical direction when the golf club head 1 is placed on a horizontal plane according to the specified lie angle and specified loft angle. The crown-sole direction is approximately perpendicular to the toe-heel direction and the face-back direction. The toe-heel direction and the face-back direction are also approximately perpendicular to each other.

[0011] 1 to 4 is a wood-type golf club head, such as a driver, but may also be a utility or fairway wood. The golf club head 1 has a volume of, for example, 380 cc or more. The golf club head 1 weighs, for example, 170 g or more and 210 g or less.

[0012] The golf club head 1 is a hollow structure having a face portion 10, a crown portion 20, a sole portion 30, a side portion 40, and a hosel portion 50. The inner surface of the hollow structure may be referred to as the inner surface, and the outer surface may be referred to as the outer surface.

[0013] The face portion 10 includes a first portion 11 and a second portion 12. The first portion 11 is connected to the crown portion 20 and the sole portion 30. The second portion 12 is plate-shaped and is joined to one side of the first portion 11 in the thickness direction. The first portion 11 and the second portion 12 can be joined together by, for example, an adhesive.

[0014] The surface of second portion 12 opposite to first portion 11 is striking surface 10f, which strikes the golf ball. Striking surface 10f is part of the outer surface of golf club head 1, which has a hollow structure. First portion 11 may have a recess on the second portion 12 side for positioning second portion 12.

[0015] The first portion 11 is made of a first material, and the second portion 12 is made of a second material. The density of the first material is, for example, 0.7 g / cm 3 More than 1.3g / cm 3 The density of the second material is greater than the density of the first material. The density of the second material is, for example, 1.5 g / cm 3 More than 2.9g / cm 3 The following is the result.

[0016] When the densities of the first material and the second material are within the above ranges, it is possible to improve the impact sound when hitting a golf ball with the golf club head 1. Furthermore, when the densities of the first material and the second material are within the above ranges, it is possible to improve the impact feel when hitting a golf ball with the golf club head 1.

[0017] The first material is, for example, a fiber-reinforced resin. Fiber-reinforced resin is a composite material of resin and fibers that serve as reinforcing members. Examples of fibers that make up fiber-reinforced resin include carbon fiber, glass fiber, aramid fiber, polyethylene fiber, Zylon fiber, and boron fiber. Examples of resins that make up fiber-reinforced resin include epoxy resin, phenol resin, polyester resin, and polycarbonate resin.

[0018] The second material is, for example, a metal, such as titanium, titanium alloy, stainless steel, aluminum, aluminum alloy, iron-based metal, magnesium, or magnesium alloy.

[0019] The crown portion 20 is a portion that forms the upper portion of the golf club head 1. In the example of FIGS. 1 to 4, the crown portion 20 includes a first crown 21 and a second crown 22. The first crown 21 has an opening that opens to the crown side, and the second crown 22 is joined to close the opening.

[0020] Specifically, when viewed in the crown-sole direction, a placement portion 211 is provided around the opening of the first crown 21. The placement portion 211 is an annular stepped portion that is one step lower than the outer surface of the first crown 21. The outer periphery of the second crown 22 is placed on the placement portion 211, and the two are joined together with an adhesive or the like. The crown portion 20 may have an integrated structure that does not have multiple crowns.

[0021] The first crown 21 and the second crown 22 can be made of, for example, a first material. By making the first crown 21 and the second crown 22 out of the first material, the first crown 21 and the second crown 22 can be made lighter than when made of the second material. This creates excess weight, which can be distributed to the optimal position of the golf club head 1.

[0022] The sole portion 30 is a portion that forms the bottom of the golf club head 1. The side portion 40 is a portion located between the crown portion 20 and the sole portion 30. The hosel portion 50 is a portion that houses a sleeve that is connected to a shaft. The sole portion 30, the side portion 40, and the hosel portion 50 can be made of, for example, a first material. The first crown 21, the sole portion 30, and the side portion 40 can be formed integrally with the first portion 11 of the face portion 10, for example.

[0023] Fig. 5 is a partially enlarged view of the face portion 10 as viewed from the striking surface side. As shown in Fig. 5, the second portion 12 of the face portion 10 preferably has grooves 100 recessed into the striking surface 10f in the area where the ball is struck. The grooves 100 may include, for example, first grooves 101 and second grooves 102. The grooves 100 may also be composed of only the first grooves 101.

[0024] The plurality of first grooves 101 extend in the toe-heel direction. The plurality of first grooves 101 can be arranged, for example, at approximately equal intervals in the crown-sole direction. The first grooves 101 are, for example, parallel to each other.

[0025] The lengths of the first grooves 101 in the toe-heel direction may be the same or different. The width of the first grooves 101 in the short direction is, for example, 0.6 mm or more and 0.9 mm or less. The maximum depth of the first grooves 101 from the striking surface 10f is preferably within a range of 0.4% of the thickness of the second portion 12.

[0026] The second grooves 102 are located between adjacent first grooves 101. The width of the second grooves 102 is narrower than the width of the first grooves 101. The maximum depth of the second grooves 102 from the striking surface 10f is shallower than the maximum depth of the first grooves 101 from the striking surface 10f. The second grooves 102 may include multiple grooves with different widths and maximum depths. The width of the second grooves 102 in the short direction is, for example, 0.001 mm or more and 0.003 mm or less. The maximum depth of the second grooves 102 from the striking surface 10f may be, for example, approximately 10% of the maximum depth of the first grooves 101.

[0027] The second grooves 102 may or may not be connected to the first grooves 101, or a mixture of these may be present. The second grooves 102 may be arranged so as to extend obliquely relative to the first grooves 101, but may also be arranged parallel or perpendicular to the first grooves 101, or a mixture of these may be present. Furthermore, the second grooves 102 are not limited to being linear, and may be bent or curved. The second grooves 102 may have a mesh pattern.

[0028] The first groove 101 and the second groove 102 can be formed by, for example, laser processing. By using laser processing, it is possible to form fine grooves with narrow widths and narrow pitches. Generally, when attempting to form grooves by laser processing in a face portion made of a relatively low-density material such as fiber-reinforced resin, it is difficult to accurately form grooves of the required size due to the influence of heat generated by laser irradiation.

[0029] In the golf club head 1, the second portion 12 located on the outer surface side of the face portion 10 is made of a second material with a relatively high density, such as metal, so that fine grooves such as the second groove 102 can be formed with high precision.

[0030] On the other hand, since the first portion 11 of the face portion 10 is made of a first material such as a fiber-reinforced resin that has a relatively low density and is light, it is possible to reduce the weight of the face portion 10. This makes it possible to create surplus weight, which can be distributed to the optimal position of the golf club head 1.

[0031] The thickness of the second portion 12 is preferably thinner than the thickness of the first portion 11. The thickness of the first portion 11 is, for example, 3 mm or more and 5 mm or less. The thickness of the second portion 12 is, for example, 0.2 mm or more and 0.6 mm or less. By making the thickness of the second portion 12 0.2 mm or more, the impact sound of the face portion 10 can be improved and it becomes easier to form the first grooves 101 and the second grooves 102. Furthermore, by making the thickness of the second portion 12 0.6 mm or less, it is possible to prevent the face portion 10 from becoming too heavy.

[0032] Furthermore, in the golf club head 1, when the second portion 12 of the face portion 10 has the grooves 100, the frictional force between the striking surface 10f and the golf ball is improved when the golf ball is struck, thereby reducing the amount of spin on the struck golf ball. In particular, by providing fine second grooves 102 in addition to the first grooves 101, the groove density can be increased, resulting in a significant effect of reducing the amount of spin.

[0033] <Modification of the first embodiment> Fig. 6 is a bottom view illustrating a golf club head 1A according to Modification 1 of the first embodiment, showing the golf club head 1A as viewed from the sole side. Fig. 7 is a cross-sectional view illustrating the golf club head 1A according to Modification 1 of the first embodiment. As shown in Figs. 6 and 7, in the golf club head 1A, the sole portion 30 includes a first sole 31 and a second sole 32. The first sole 31 has an opening that opens to the sole side, and the second sole 32 is joined to close the opening.

[0034] Specifically, when viewed in the sole-crown direction, a placement portion 311 is provided around the opening of the first sole 31. The placement portion 311 is an annular stepped portion that is one step lower than the outer surface of the first sole 31. The outer periphery of the second sole 32 is placed on the placement portion 311, and the two are joined together with an adhesive or the like.

[0035] The first sole 31 may be made of, for example, a first material. The first sole 31, the first crown 21, and the side portion 40 may be formed integrally with the first portion 11 of the face portion 10, for example.

[0036] The second sole 32 can be made of, for example, a third material having a higher specific gravity than the first material. The density of the third material is, for example, 4.0 g / cm 3 More than 10g / cm 3 The third material is, for example, a metal, such as titanium, titanium alloy, stainless steel, iron-based metal, or tungsten alloy.

[0037] In this way, by forming the second sole 32 from the third material having a higher specific gravity than the first material, the center of gravity of the golf club head 1A can be made lower.

[0038] As shown in FIG. 7, in the golf club head 1A, the second sole 32 may have one or more attachment portions 301 to which weight adjustment parts 302 can be attached and detached.

[0039] Fig. 8 is a cross-sectional view of the vicinity of the attachment part 301 and the weight adjustment part 302. As shown in Figs. 7 and 8, the attachment part 301 is cylindrical and has a female thread on its inner surface. The attachment part 301 is disposed on the inner surface side of the second sole 32 and opens to the outer surface side of the second sole 32. The weight adjustment part 302 is attached to the attachment part 301 by fastening a screw.

[0040] The weight adjustment component 302 includes, for example, a head portion 302a, an externally threaded portion 302b, and a cylindrical portion 302c. The externally threaded portion 302b and the cylindrical portion 302c are provided on one side of the head portion 302a and concentrically with the head portion 302a.

[0041] The head 302a is, for example, circular when viewed from the sole side. The male threaded portion 302b and the cylindrical portion 302c are, for example, circular and have a smaller diameter than the head 302a when viewed from the crown side. The head 302a has, for example, a cross-shaped or hexagonal groove. The head 302a does not protrude from the outer surface of the second sole 32. The male threaded portion 302b can be threaded into the female threaded portion of the attachment portion 301.

[0042] The weight adjustment component 302 can be made of, for example, a fourth material having a higher specific gravity than the first material. The density of the fourth material is, for example, 2.5 g / cm 3 More than 14g / cm 3 The fourth material is, for example, a metal. Examples of the metal include titanium, titanium alloys, stainless steel, aluminum, aluminum alloys, iron-based metals, and tungsten alloys.

[0043] 7 and 8 show an example in which weight adjustment part 302 is attached to attachment part 301, but weight adjustment part 302 can be attached and detached to attachment part 301. For example, a plurality of types of weight adjustment part 302 with different weights can be prepared, and weight adjustment part 302 with the required weight can be selected and attached as needed.

[0044] In this way, by attaching and detaching the weight adjustment part 302 to the attachment part 301, it is possible to adjust the position of the center of gravity of the golf club head 1A.

[0045] Fig. 9 is a partial cross-sectional view of the vicinity of the hosel portion 50. As shown in Figs. 6 to 9, the hosel portion 50 of the golf club head 1A may have a detachable sleeve 60 fixed to the tip of the shaft. The sleeve 60 may be made of metal, for example. The sleeve 60 may also be made of resin.

[0046] By using the sleeve 60, the shaft can be easily replaced by rotating the screw 70. It is also possible to form the axis of the shaft insertion hole provided in the sleeve 60 at an angle with respect to the central axis of the hole in the hosel portion 50. In this case, the lie angle and face angle can be changed by rotating the sleeve 60 in the axial direction and changing the fitting position with the hosel portion 50.

[0047] Although the preferred embodiments have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims. [Explanation of symbols]

[0048] 1,1A Golf Club Head 10 Face 10f striking surface 11 Part 1 12 Part 2 20 Crown part 21 First Crown 22 Second Crown 30 Sole 31 First Sole 32 Second Sole 40 Side part 50 Hosel part 60 sleeves 70 screws 100 grooves 101 First groove 102 Second groove 211,311 Placement section 301 Mounting part 302 Weight adjustment parts 302a head 302b male thread 302c Cylindrical part

Claims

1. A golf club head having a face portion, The face portion is a first portion constructed from a first material; a second portion made of a second material and joined to one side of the first portion in a thickness direction; The density of the first material is 1.3 g / cm ３ is as follows: The density of the second material is greater than the density of the first material and is 2.9 g / cm ３ is as follows: a surface of the second portion opposite to the first portion serves as a striking surface; The second portion has a groove recessed relative to the striking surface.

2. The density of the first material is 0.7 g / cm ３ That's all, The density of the second material is 1.5 g / cm ３ 2. The golf club head according to claim 1.

3. The golf club head of claim 2 , wherein the second portion has a thickness less than the thickness of the first portion.

4. The golf club head according to claim 3 , wherein the second portion has a thickness of 0.2 mm or more and 0.6 mm or less.

5. The groove is a plurality of first grooves extending in a toe-heel direction; a second groove located between adjacent first grooves, The golf club head of claim 1 , wherein the second groove has a width narrower than the width of the first groove.

6. The shoe has a crown portion, a sole portion, and a side portion, The golf club head according to claim 1 , wherein the first portion connects with the crown portion and the sole portion.

7. The sole portion is a first sole constructed from a first material; a second sole constructed from a third material; The density of the third material is 4.0 g / cm ３ 10g / cm or more ３ 7. The golf club head of claim 6, wherein:

8. The golf club head according to claim 7 , wherein the second sole has one or more attachment portions to which weight adjustment components can be detachably attached.

9. the weight adjustment component is made of a fourth material, The density of the fourth material is 2.5 g / cm ３ 14g / cm or more ３ 9. The golf club head of claim 8, wherein:

10. 7. The golf club head according to claim 6, further comprising a hosel portion to which a sleeve fixed to the tip of the shaft can be detachably attached.

11. 6. The golf club head according to claim 1, wherein the volume is 380 cc or more.

12. 6. The golf club head according to claim 1, wherein the weight is equal to or greater than 170 g and equal to or less than 210 g.

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