WO2007010588A1

WO2007010588A1 - Golf club head

Info

Publication number: WO2007010588A1
Application number: PCT/JP2005/013142
Authority: WO
Inventors: Norihiko Nakahara; Masahiko Miyamoto
Original assignee: The Yokohama Rubber Co., Ltd.
Priority date: 2005-07-15
Filing date: 2005-07-15
Publication date: 2007-01-25

Abstract

A golf club head, comprising a face part having a fiber-reinforced plastic layer including reinforced fibers with different orientation angles. The width of the face of the face part in the toe and heel directions is larger than the height of the face in the crown and sole directions. The mass Wh of the reinforced fibers among the fiber-reinforced fibers included in the fiber-reinforced plastic layer in the range of -55° to +55° including 0° in orientation angle when the direction of the ground-contact face of a golf club when the golf club is disposed at a normal address position is set in a reference direction (0°) is larger than the mass WV of the reinforced fibers in the range of +55° to -55° including ±90° in orientation angle. As a result, the golf club capable of increasing repulsion while maintaining the durability (strength) of the golf club head can be provided.

Description

Specification

Golf club head technology

[0001] The present invention relates to a golf club head having a face portion in which fiber reinforced plastic layers containing reinforcing fibers having different orientation angles are laminated, and maintains the hitting performance such as the flight distance and strength of the golf ball. In addition, the present invention relates to a golf club head in which the mass of the face portion is reduced and the hit feeling due to hitting sound is improved at the time of hitting.

Background art

[0002] In recent years, various structures (composite faces) in which a metal layer and a fiber-reinforced plastic layer are laminated in combination have been proposed for the face portion of a golf club head, in addition to a conventional metal simple substance. By using the composite face for the golf club head, the weight adjustment of the golf club head, the adjustment of the center of gravity position, and the like are suitably realized.

[0003] As an example of such a golf club head, the surface of the face is increased by increasing the number of reinforcing fibers or by laminating fibers with high elastic modulus toward the toe and heel directions which are the lateral directions of the face surface. A golf club head made of a composite material having a face portion with a higher rigidity in the lateral direction in the toe and heel directions than in the longitudinal direction in the crown and sole directions of the golf club has been proposed (for example, Patent Literature 1 and Patent Document 2.) ₀

Patent Document 1: Japanese Unexamined Patent Application Publication No. 2002-17911

Patent Document 2: Japanese Utility Model Publication No. 05-7261

Disclosure of the invention

Problems to be solved by the invention

[0004] However, the golf club head described in Patent Document 1 has a composite face in which a metal layer and a reinforcing fiber plastic layer are combined and laminated. In consideration of the above, it does not improve the resilience of the golf club head while maintaining the strength of the face when the golf ball is hit. In addition, the golf club head described in Patent Document 2 has a horizontal fiber arrangement density higher than a vertical fiber arrangement density, but it is durable considering the height and width of the face surface. To improve resilience while maintaining sexuality There is no.

[0005] An object of the present invention is to solve the above-described prior art, and is a golf club head having a composite face including a fiber-reinforced plastic layer including reinforcing fibers having different orientation angles, and the durability of the golf club head An object of the present invention is to provide a Gonoref club head capable of improving resilience while maintaining (strength). Means for solving the problem

In order to achieve the above object, the present invention provides a golf club head having a face portion including a face surface for hitting a golf ball, the face portion including reinforcing fibers having different orientation angles. A fiber reinforced plastic layer, wherein the face surface has a width in the toe and heal direction that is greater than the height of the face surface in the crown and sole direction, and the fiber Of the reinforcing fibers contained in the reinforced plastic layer, the orientation angle includes 0 ° when the direction of the ground contact surface when the golf club is placed at the normal address position is the reference direction (0 °) —55 ° to Mass of reinforcing fibers in the range of + 55 ° W force The orientation angle of the golf club head is larger than the weight w of the reinforcing fibers in the range of + 55 ° to 55 °, including ± 90 °. provide.

[0007] Further, when the direction of the ground contact surface when the golf club is disposed at a normal address position is a reference direction (0 °), the orientation angle of the reinforcing fibers included in the fiber-reinforced plastic layer is The mass W of the reinforcing fiber in the range of 55 ° to + 55 ° including 0 °, and the orientation angle is ± 90. Including +55. ~ One 55. The mass of the reinforcing fiber in the range of W force It is preferable that the following formula is set according to the width L of the face surface and the height L of the face surface of the golf club head.

I / O. 7 XL / (L + L) ≤ W / (W + W) ≤ 2 XL / (L + L) In this way, the mass w of the reinforcing fiber and the mass W of the reinforcing fiber are determined as a golf club. A Gonoref club head can also be designed using a method of setting the width L and the height L of the face surface of the head.

[0008] Further, the present invention is a golf club head having a face portion including a face surface for hitting a golf ball, wherein the face portion has a fiber-reinforced plastic layer including reinforcing fibers having different orientation angles. In the face surface, the length is in the toe and heel directions. The width of the face surface is greater than the height of the face surface, which is the length in the crown and sole directions. The direction of the ground contact surface when the golf club is placed at the normal address position is the reference direction (0 °). Bending modulus in 0 ° direction E force Bending in ± 90 ° direction

h

Provided is a golf club head characterized by an elastic modulus greater than E.

[0009] In addition, when the direction of the ground contact surface when the golf club is placed at a normal address position is the reference direction (0 °), the flexural modulus E of the face portion in the 0 ° direction and

h

The flexural modulus E of the face in the 90 ° direction E, the width L of the face surface of the golf club head, and the height L of the face surface shall be set to satisfy the following equation: h

Is preferred.

I / O. 6 X L / (L + L) ≤ E / (E + E) ≤ 2 X L / (L + L)

v v h v v h v v h In this way, the bending elastic modulus E and the bending elastic modulus E are set to the golf club head frame.

h V

Golf club h using a method of setting according to the width L and the height L of the ace surface

The head can also be designed.

[0010] The face portion is preferably formed of a laminated structure in which at least two metal layers and the reinforcing fiber plastic layer are laminated.

Further, the thickness of the metal layer is preferably 0.1 to 2 Omm.

In the laminated structure of the face portion, it is preferable that the metal layers to be laminated are two or more layers, and the number of laminated structures is ten or less.

Further, in the laminated structure of the face part, the surface opposite to the face surface for hitting the golf ball is preferably a surface of the reinforcing fiber plastic layer.

[0011] Further, in the laminated structure of the face part, it is preferable that a face surface for hitting a golf ball is a surface of a metal layer.

Further, in the laminated structure of the face part, the specific gravity of the material in the center part of the face part is preferably 1.8 to 4.5.

In the laminated structure of the face part, the thickness at the center part of the face part is preferably 2.0 to 5. Omm.

Further, it is preferable that the metal layer and the fiber reinforced plastic layer are bonded with a resin film or an adhesive having a thickness of 0.02 to 1. Omm. In addition, it is preferable that the flexural modulus of the face portion is 30 to 150 GPa.

The invention's effect

According to the present invention, the face portion of the golf club head includes a fiber reinforced plastic layer having different orientation angles of reinforcing fibers, and the mass of the reinforcing fibers in the fiber reinforced plastic is adjusted according to the orientation angle. . Further, the flexural modulus of the face portion is adjusted according to the height and width of the face surface. As a result, resilience performance can be improved while maintaining durability.

Brief Description of Drawings

FIG. 1 is an exploded perspective view showing a golf club according to a first embodiment of the present invention.

2 is a front view of the golf club head shown in FIG.

FIG. 3 is a sectional view taken along line AA in FIG.

FIG. 4 is a partially enlarged view of the foot portion shown in FIG.

5 is a view for explaining the orientation angle of the fiber reinforced resin layer in the face portion of the golf club head shown in FIG. 1.

FIG. 6 is a diagram for explaining a face width and a face height.

FIG. 7 is a diagram for explaining a face width and a face height.

FIG. 8 is a diagram showing a spectrum waveform of a hitting sound of a golf club head whose face part is made of metal.

FIG. 9 is a diagram showing a spectrum waveform of a hitting sound of a golf club head whose face portion is made of FRP.

FIG. 10 is a diagram showing a spectrum waveform of a hitting sound of a golf club head in which a material of a face portion is constituted by a laminated structure of an alloy layer and an FRP layer.

FIG. 11 is a front view showing a golf club according to a second embodiment of the present invention.

FIG. 12 is a sectional view taken along line BB in FIG.

[FIG. 13] (a) is a diagram for explaining the face width and face height, and (b) is a diagram for explaining the orientation angle of the fiber reinforced resin contained in the FRP layer.

Explanation of symbols

[0014] 10 golf clubs 20, 21 Gonolev ί

22 Face §

23 Hue ¹

24 Sole

26 Crown

30 Hosel

32 opening

40 Gonoref Club

42 socket

50, 62 metal layers

60 FRP layer

BEST MODE FOR CARRYING OUT THE INVENTION

[0015] The golf club head of the present invention will be described below in detail based on preferred embodiments shown in the accompanying drawings.

FIG. 1 is an exploded perspective view of a golf club using the golf club according to the first embodiment of the present invention. FIG. 2 is a front view of the golf club head shown in FIG.

As shown in FIG. 1, the golf club 10 has a golf club head 20 and a golf club shaft 40.

The golf club head 20 has a face portion 22, a sole portion 24, a crown portion 26, a side wall portion 28, and a hosel portion 30. In the golf club head 20 of the present embodiment, the face part 22, the sole part 24, the crown part 26, and the side wall part 28 are each formed of a plate-like member, and these members are joined together to form an outer shell structure. Is configured.

Further, as shown in FIG. 1, the hosel portion 30 is for fixing the golf club shaft 40 to the golf club head 20 and is provided in the crown portion 26. The hosel portion 30 is provided with an opening 32 into which the golf club shaft 40 is inserted. The golf club shaft 40 is fixed to the golf club head 20 through a socket 42. The socket 42 is provided with an opening 44 through which the golf club shaft 40 can be passed.

[0018] The face portion 22 has a surface that becomes a face surface 23 for hitting a golf ball. The face portion 22 has a laminated structure in which a metal layer and a fiber reinforced plastic layer (hereinafter referred to as FRP layer) are laminated. This laminated structure will be described in detail later. The outermost surface of the striking portion of the face surface 23 that is in direct contact with the golf ball is constituted by the metal layer 50. In addition, as shown in FIG. 2, the toe α side force is also formed in this metal layer in parallel to the heel | 8 side and the score line L force extending in the horizontal direction 例えば, for example, three. Here, the direction facing the heel j8 side from the toe α side is referred to as the horizontal direction H, and when the face portion 22 is set up vertically, the sole portion 24 side force is also directed toward the crown portion 26 side. The direction perpendicular to the horizontal direction H is called the vertical direction V.

In the golf club head 20 of this embodiment, the length L force in the vertical direction V is formed with a face portion 22 that is shorter than the length L in the horizontal direction H. Therefore, gol on the face 22

When a ball hits, the distortion in the vertical direction V caused by the stagnation of the face surface is larger than the distortion in the horizontal direction H.

Therefore, the face portion 22 takes the bending elastic modulus E of the face portion in the vertical direction V into the horizontal direction in consideration of the relationship between the length L in the vertical direction V and the length L and h in the horizontal direction H (L> L). h

By making the flexural modulus E of the face part in direction H higher than the face part 22 h,

While maintaining sufficient strength, the resilience when a golf ball is hit can be improved.

In this way, in order to give anisotropy to the elastic modulus of the face portion 22, in the present invention, the member used for the face portion 22 has the orientation direction of the reinforcing fibers of the FRP layer and the laminated structure according to the shape of the face portion 22. Determine the number of stacks. As the shape of the face portion 22, the length L in the vertical direction V and the length L in the horizontal direction H are used as indices representing the shape.

h

With reference to FIGS. 3 to 5, a laminated structure constituting a part of the face portion 22 will be described. 3 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 4 is an enlarged view of a portion of the face portion shown in FIG. FIG. 5 is a diagram illustrating the orientation angle of the fiber reinforced resin contained in the FRP layer.

The laminated structure 52 is a composite structure that collectively shows a laminate of a metal layer and an FRP layer, and constitutes a part of the face portion 22.

The laminated structure 52 has a metal layer 50 on the face surface 23 that is a surface for hitting a golf ball. Thereafter, a total of four metal layers and FRP layers are laminated in the order of FRP layer 60, metal layer 62, and FRP layer 60.

The thickness in the vicinity of the central portion (face surface gravity center position) in the laminated structure 52 of the face portion 22 is preferably 2.0 to 4.5 mm from the viewpoint of resilience. In addition, the specific gravity of the material in the vicinity of the center portion of the laminated structure 52 is preferably 1.8 to 5.0 from the viewpoint of lightness of the face portion.

The number of stacked layers of the stacked structure is not limited to this and can be arbitrarily set, but is preferably 10 layers or less from the viewpoint of cost and complexity of the manufacturing process.

In the present embodiment, the face surface 23 may be formed by a force FRP layer in which the face surface 23 is formed by a metal layer. Furthermore, the face (striking surface) may be made of metal and the back side may be made of FR P to form the face surface 23! /.

In the present invention, as shown in FIG. 5, the reinforcing fiber contributing to the improvement of the flexural modulus E of the face portion in the vertical direction V and the direction of the flexural modulus E of the face portion in the horizontal direction H

By classifying the reinforcing fibers that contribute to the top according to the orientation angle, and adjusting the mass of each reinforcing fiber according to the length L in the vertical direction V and the length L in the horizontal direction H, h

Adjust the flexural modulus in each direction.

[0023] There are various methods for adjusting the flexural modulus in each direction. As shown in Fig. 5, the reinforcing fibers having an orientation angle in the range of 55 ° to + 55 °, including ± 0 °, The bending elastic modulus E of the face portion in the vertical direction V is considered to contribute to the improvement of the bending elastic modulus E of the face portion, and the bending elastic modulus E of the face portion can be adjusted using the mass W of the reinforcing fiber whose orientation angle is within this range.

On the other hand, as shown in FIG. 5, the reinforcing fibers having an orientation angle in the range of + 55 ° to 55 ° including ± 90 ° contribute to an improvement in the flexural modulus E of the face portion in the vertical direction V. The flexural modulus E of the face portion can be adjusted by using the mass W of the reinforcing fiber that is considered and is in the range of the orientation angular force.

[0024] It is generally known that increasing the flexural modulus of the face part improves the durability of the golf club head, and decreasing the flexural modulus of the face part improves the resilience of the face part. . Therefore, the inventor determines the mass W of the reinforcing fiber and the mass W of the reinforcing fiber according to the length in the vertical direction V and the length L in the horizontal direction H based on the following formula (1). V h

By adjusting the orientation direction of the reinforcing fibers contained in the reinforcing fiber plastic layer, the rebound of the golf club head is improved while maintaining sufficient strength as the face portion 22 as shown in Examples a and b described later. I found out that I can make it.

I / O. 7 X L / (L + L) ≤ W / (W + W) ≤ 2 X L / (L + L)

V V h v v h v v h

1)

[0025] Further, based on the following equation (2), the length L in the vertical direction V and the length L in the horizontal direction H

Depending on the relationship of V h, the flexural modulus E of the face part in the vertical direction V and the flexural modulus E of the face part in the horizontal direction H may be directly determined! /.

h

I / O. 6 X L / (L + L) ≤ E / (E + E) ≤ 2 X L / (L + L) ... (2 v v h v v h v v h

)

[0026] Mass of reinforcing fiber according to length L in vertical direction V and length L in horizontal direction H

V h

W and the mass of the reinforcing fiber Determine the W and the reinforcing fiber contained in the fiber-reinforced plastic layer.

V h

By adjusting the orientation direction of the fibers, the resilience of the face portion 22 can be improved while maintaining sufficient strength as the face portion 22, as shown in Examples a and b described later.

Here, the orientation angle is such that the golf club is set at a normal address position, and the direction of the reference plane A is the reference direction (0 °).

To install a golf club at a normal address position means to install the golf club head 20 at a line angle and so that the shaft axis and the leading edge are parallel to each other. Installation according to the lie angle is the difference between the round of the sole surface and the reference surface A.

1) Install in such a way that the clearance between the toe side and the heel side is approximately equal. If the round of the sole surface is unclear, the score line L of the face surface 23 and the reference surface A are parallel.

1

You may install in the state.

[0028] As shown in FIG. 6, the face height L in the vertical direction V of the face surface is the edge A force frame located at the uppermost position of the face surface 23 when installed in the address position.

2 Up to the lowest edge A of the ace surface 23 The distance in minutes (the vertical distance in FIG. 2)! The face width L in the horizontal direction H of the face surface is the edge A force located closest to the toe side of the face surface 23. H 4

For reference plane A and face 23 up to edge A closest to the heel side

5 1

The distance between the parallel components.

[0029] Also, when it is difficult to distinguish each of the edges A 1, A 1, A 2, A, as shown in FIG.

2 3 4 5

Place the love head 20 in the normal address position, and the reference plane A force is perpendicular to the reference plane A up to the uppermost end A located at the top of the crown of the golf club head 20.

6 1

The distance is substituted as the face height L, and the position A on the heel side of the golf club head 20 located 22.23 mm above the reference plane A from the end A located on the most toe side of the golf club head 20 Up to the component parallel to the reference plane A and the face plane 23

8 1

The distance may be the face width L.

h

[0030] Further, in the present embodiment, the face portion of the golf club head is configured by a stacked structure of a metal layer and an FRP layer, so that the best hitting sound for the golfer can be obtained. The relationship between the material of the face part of the golf club head and the hitting sound will be described with reference to FIGS.

FIG. 8 is a graph showing the frequency distribution of the hitting sound of a golf club head in which the sound pressure is plotted on the vertical axis and the frequency is plotted on the horizontal axis, and the face portion material is metal.

As shown in FIG. 8, when the face surface is made of metal and the golf club head is hit, clear peaks P 1, P 2, and P appear with high sound pressure in the hitting sound when hit. like this

one two Three

Peaks P, P, P force Golf players can detect the metal sound generated when a golf ball is hit.

one two Three

Sounds like Such an impact sound is not attenuated by vibration, and peaks P, P, P, as shown in FIG.

1 2 level is very high. For this reason, golfers have face surfaces made of metal.

Three

V, I feel that the golf club head is hard to hit.

[0032] FIG. 9 is a graph showing the frequency distribution of the hitting sound of a golf club head in which the sound pressure is plotted on the vertical axis and the frequency is plotted on the horizontal axis, and the material of the face portion is FRP.

As shown in Fig. 9, when the material of the face part is only FRP, there is no sound pressure peak due to the effect of plastic. When a golf ball is hit using a golf club head that does not have such a sound pressure peak, the vibration attenuation at the time of hitting is large. Therefore, the golfer feels that the hit feeling is soft.

Here, the hitting sound is the largest factor that controls the hit feeling. For this reason, the present inventors have found that it is most effective to improve the hitting sound in order to improve the hit feeling.

Therefore, the golf club head according to the present invention can be improved by forming the face portion with a laminated structure of the metal layer and the FRP layer so that the hit feeling is not hard and soft. They thought.

However, the impact sound cannot be adjusted by simply pasting the metal layer and the FRP layer together. Further, regarding the laminated structure used for the face portion, the laminated structure of the metal layer and the FRP layer, the number of laminated layers, The present inventors have found that the best impact sound for golfers can be obtained by adjusting the laminated thickness and the like, as shown in the examples described later.

[0034] FIG. 10 shows the impact sound of a golf club head in which the vertical axis represents sound pressure and the horizontal axis represents frequency, and the face portion is composed of a six-layer laminated structure of a Ti alloy layer and an FRP layer. It is a graph which shows frequency distribution of. In the 6-layer laminated structure that forms the face part, the striking part (surface) is made of a Ti alloy layer (thickness 1.2 mm), and the back face is made of an FRP layer. A total of four alloy layers (thickness 0.13 mm) and FRP layers were laminated. The face part has a total thickness of 3.2 mm.

In the golf club head of the present invention, the sound pressure peak P

1, P

2, P occurs, but 3

If the golfer hears the hitting sound, the peak level is lower than P, P, P

one two Three

In addition, a sound that is just right is obtained.

Therefore, in the present embodiment, the best hitting sound for the golfer can be obtained by configuring the face portion of the golf club head with a laminated structure of the metal layer and the FRP layer.

[0035] The materials of the metal layer and the FRP layer of the laminated structure constituting the face portion 22 of the present embodiment will be described.

Examples of the metal layer include stainless steel, maraging steel, iron, aluminum, titanium, titanium alloy, copper, brass, nickel, nichrome, tin, lead, magnesium, gold, silver, platinum, and various other metals and What is comprised with an alloy etc. is illustrated. [0036] As the above-mentioned stainless steel, for example, NSSHT1770 (trade name (composition: Fe—0.04C-1.5Si-0.3Mn—0.03P—0.004S—7) manufactured by Nisshin Steel Co., Ltd. 2Ni— 14.7Cr—0.7Cu-0, 4Ti 0.009N))).

Examples of the maraging steel described above include YAG250 (trade name (composition: Fe—18Ni—8Co—5Mo—0.4Ti—0.1A1)), YAG300 (trade name (composition: Fe —) manufactured by Hitachi Metals, Ltd. 18Ni—9Co—5Mo—0.9 Ti—0.1A1)) and YAG350 (trade name (composition: Fe—18Ni—12Co—4Mo—1.7 Ti—0.1A1)).

[0037] Further, as the above-mentioned titanium alloy, Kobe Steel, TVC (trade name (composition: Ti-1 3V-1 lCr-3A1)), and JFE Holding (former Nippon Steel Pipe Co., Ltd.), SP700 (trade name (composition: Ti—4.5A1-3V—2Mo—2Fe)) is exemplified.

[0038] Further, the FRP layer of the present embodiment is obtained by reinforcing matrix resin with reinforcing fibers. Examples of the reinforcing fibers include inorganic fibers such as carbon fibers, boron fibers, glass fibers, alumina fibers, silicon carbide fibers, and silicon nitride fibers, aramid fibers, polyarylate fibers, polyethylene fibers, and polyester fibers. Illustrative are organic fibers or metal fibers such as titanium fibers, amorphous fibers, and stainless steel fibers. Further, as the reinforcing fiber, a plurality of types may be selected from those exemplified above and used as the reinforcing fiber.

Further, the orientation of the reinforcing fibers may be used in the state of a force or a cross (woven fabric) arranged in a predetermined direction. Furthermore, even if these reinforcing fibers or cloths are provided in one or more layers (layers), in the present invention, they are defined as one FRP layer. The flexural modulus of the face portion in the horizontal direction H and the vertical direction V can be adjusted by the orientation of the reinforcing fibers as described above.

[0039] Examples of matrix resins include thermosetting matrix resins such as epoxy resins, unsaturated polyester resins, polyurethane resins, diallyl phthalate resins, and phenol resins.

[0040] As the matrix resin, epoxy resin is preferred! Examples of such matrix resins include glycidyl ether type epoxy resins (bisphenol A, F, S type epoxy resins, novolac type epoxy resins, brominated bisphenol A type epoxy resins), ring formula Luminous epoxy epoxies, glycidinoresestenolic epoxies, glycidylamine epoxies such as tetraglycidinoresinaminodiphenylmethane or triglycidyl p-aminophenol, and heterocyclic rings A formula epoxy resin is illustrated. Furthermore, as the matrix resin, one or more selected from these various epoxy resins can be used. As the matrix resin in the present embodiment, bisphenol A, F, S glycidylamine-based epoxy resin is particularly suitable.

[0041] Further, as the curing agent, an amine curing agent such as dicyandiamide (DICY), diaminodiphenylsulfone (DDS), diaminodiphenylmethane (DDM); HHPA), methylhexahydrophthalic anhydride (MHHPA) and the like. As the curing agent, an amine curing agent can be particularly preferably used.

[0042] A pre-predder can also be used for the FRP layer. As this pre-predder, for example, P3251S-15 (trade name) UD pre-predder made by Torayen soil or F6343B-05P (trade name) cross-prepredder made by Torayen soil is exemplified.

[0043] Further, the laminated structure constituting the face portion 22 in the golf club head 10 of the present embodiment may be formed by providing a resin film at the boundary between the metal layer and the FRP layer or by applying an adhesive. Good. In this case, the thickness of the adhesive layer of the adhesive is preferably 0.02 to: L Omm.

[0044] Examples of the resin film include polyurethane resin, nylon resin, modified nylon resin, polyethylene terephthalate resin, polyvinyl chloride resin, polycarbonate resin, polysalt vinylidene resin, resin Examples thereof include thermoplastic resin films such as chilled cellulose resin and cellulose acetate resin.

[0045] It should be noted that it is preferable to use a resin film having high compatibility with the matrix resin of the pre-preda. For example, when an epoxy resin is used for the matrix resin, a polyurethane resin, a modified nylon resin film, etc. are suitable as the resin film. The thickness of the resin film is preferably 0.02 to: L Omm.

FIG. 11 is a front view showing a golf club according to the second embodiment of the present invention. 12 is a cross-sectional view taken along the line BB in FIG. In this embodiment, the first implementation The same components as those of the golf club head of the embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

[0047] In the second embodiment, the golf club 12 has the golf club head 21 and the golf club shaft 40. However, the golf club head is different from that of the first embodiment, and other configurations are the same. This is the same as the golf club 10 of the first embodiment.

The golf club 12 is a golf club in which a golf club head 21 has a face portion 22, a sole portion 24, an upper portion 27, and a hosel portion 30, and is generally called an iron.

[0048] In the golf club head 21 of the present embodiment, the face portion 22 has a laminated structure 52 formed by laminating a metal layer and an FRP layer, and the sole portion 24 and the upper portion 27 are Also, metal materials will be strong. The face part 22, the sole part 24, and the upper part 27 are joined together to form a non-hollow structure.

Also in this embodiment, the face surface 23 of the face portion 22 is formed in parallel with, for example, three score line L forces extending in the horizontal direction H from the toe α side to the heel j8 side.

The laminated structure 52 of the face part 22 is a composite structure in which a metal layer and an FRP layer are laminated, and constitutes a part of the face part 22. In the laminated structure 52, a metal layer 50 is formed on a face surface 23 that is a surface for hitting a golf ball. Hereinafter, an FRP layer and a metal layer are appropriately laminated. The number of stacked layers 52 can be set without limitation, and the description thereof is omitted here.

[0050] Fig. 13 (a) shows the length L in the vertical direction V and the length L in the horizontal direction H of the face surface.

FIG. 13 (b) is a diagram for explaining the orientation angle of the reinforcing fibers contained in the FRP layer.

As shown in FIG. 13 (a), the face height L in the vertical direction V of the face surface is the highest on the face surface 23 when the score line force is located at the uppermost position of the face surface 23 in the state where it is installed at the normal address position. To reference plane A, up to the edge located below

1 Vertical component distance (the vertical distance in Fig. 13 (a)). The face width L in the horizontal direction H of the face surface is the scorer located closest to the toe side of the face surface 23.

h

Reference plane A from the inner surface to the score line located closest to the heel side of the face surface 23

1 and the distance of the component parallel to the face surface 23. As shown in FIG. 13B, the orientation angle is such that the golf club is set at a normal address position, and the direction of the reference plane A is the reference direction (0 °).

[0051] According to the length L in the vertical direction V and the length L in the horizontal direction H, the mass W of the reinforcing fiber and the mass W of the reinforcing fiber are determined, and the orientation of the reinforcing fiber included in the fiber-reinforced plastic layer is determined. By adjusting the direction, it is possible to improve the resilience of the golf club head while maintaining sufficient strength as the face portion 22.

In addition, based on the above formula (2), the flexural modulus E of the face portion in the vertical direction V and the horizontal elasticity V in the vertical direction V are directly You can also determine the flexural modulus E of the face in direction H! /.

[0052] In other words, based on the above formula (1) or formula (2), the mass of the reinforcing fiber or the bending elastic modulus is determined according to the length L in the vertical direction V and the length L in the horizontal direction H. By adjusting the orientation direction of the reinforcing fibers contained in the reinforcing fiber plastic layer, the resilience of the golf club head can be improved while maintaining sufficient strength as the face portion 22.

[Example a]

The golf club head of the present invention will be specifically described in comparison with examples of the present invention and conventional examples.

In Example a, the conventional examples shown in Table 1 below and Examples 1 to 16 were evaluated using the feel, strength, resilience, and flight distance shown in Table 3 below as evaluation items.

In Example a, a gob for TRX-DUO M40 (trade name) manufactured by Yokohama Rubber Co., Ltd. was produced and evaluated. This golf club is 45 inches long.

In each test of Example a, a TRX (trade name) ball manufactured by Yokohama Rubber Co., Ltd. was used as the golf ball unless otherwise specified. The conventional example is a golf club head in which only a titanium alloy is used. Examples 1 to 16 are golf club heads including a CFR P layer in which reinforcing fibers are carbon fibers.

[0055] [Table 1] Face surface Other than face surface Laminated Face part Face part Resin Back face Face part Face part Face part Face part

Face Flexural Elastic Flexural Elastic Thickness Thickness Number of Layers Film Thickness Width L _h Height Mass w _h Mass w _v

Material Material Number of layers Specific gravity ratio Rate

{mm; (mmj (layer) Material used (mm) (mm) (mm) (g) (g)

(Layer) E _h (GPa) E _v (GPa) Conventional example Ti alloy 3.0-----Ti alloy 5.0 3.0 40 125 ― 1 1 15 1 15 Example 1 CFRP 4.6----CFRP 1.6 4.6 50 100 12.8 6.4 42 42 Example 2 GFRP 4.6-----CFRP 1.6 4.6 35 120 9.6 9.6 44 40 Example 3 Ti alloy 1.0 n alloy 0 13 1 4 Yes CFRP 2.6 3.8 50 100 6.4 4.8 75 86 Example 4 Ti alloy 1.0 Γι π gold 0.13 1 4 Yes CFRP 2.5 4.2 30 125 6.4 5.4 75 70 Example 5 Ti alloy 1.0 "Aluminum alloy 0.13 1 4 Yes CFRP 2.6 3.8 30 125 8.0 3.2 63 73 Example 6 Ti alloy 1.0 Ti alloy 0.13 1 4 Yes CFRP 2.6 3.8 40 110 4.8 6.4 83 71 Example 7 CFRP 4.2----CFRP 1.6 4.2 40 1 15 1 1.2 6.4 60 57 Example 8 CFRP 3.8---I-CFRP 1.6 3.8 47 125 9.6 6.4 62 57 Example 9 Ti alloy 1.0 Ti alloy 0.13 1 4 Yes CFRP 2.7 3.4 40 120 8.0 1.6 76 66 Example 1 0 Ti alloy 1.0 Ti alloy 0.13 1 4 Yes CFRP 2.7 3.4 36 125 6.4 3.2 70 66 Example 1 1 Ti alloy 1.0 Ti alloy 0.13 1 4 Yes CFRP 2.8 3.2 46 120 4.8 4.0 67 64 Example 1 2 Ti alloy 2.5 Ti alloy 0,13 5 11 ft Ti alloy 3. 4 6.0 46 120 4.0 8.0 69 99 Example 1 3 Ti alloy 2.5 Ti alloy 0.13 1 4 Yes CFRP 3.1 6.1 42 125 4.8 9.6 83 92 Example 1 4 Ti alloy 1.0 Ti alloy 0.05 3 8 Yes CFRP 2.3 5.7 43 120 6.4 12.8 53 61 Example 1 5 SUS alloy 2.2 SUS alloy 0.13 1 4 Yes CFRP 4.8 4.6 60 65 3.2 6.4 1 19 143 Example 1 6 Ti alloy 1.0 Ti alloy 0.13 1 4 Yes CFRP 3.9 1.7 70 75 0.8 1.6 80 107

[0056] [Table 2] Table 2

[0057] The composition of the “Ti alloy” shown in the “Face surface” column of Table 1 is Ti-4.5Al-3V-2Fe—

2Mo. In addition, the composition of “Ti alloy” shown in the “Other than face surface” column is Ti-15V.

-3Cr-3A1-3Sn.

[0058] "CFRP" has a reinforced fiber Young's modulus of 24 tons and a pre-preparator weight of 298g.

Zm ² , fiber basis weight is 200gZm ² , grease basis weight is 98gZm ² , thickness is 0.1

9 lmm.

Furthermore, for the “resin film” shown in Table 1, a polyurethane resin-based resin film having a thickness of 0.08 mm was used.

[0059] Further, the "specific gravity of the face part", "thickness of the face part", and "face part bending elastic modulus" are sampled so that there is always a region having a radius of 15 mm centered on the center position of the face surface. This is the value when sampling.

The method for measuring the center position of the face surface (face surface center of gravity position) was determined by a center measuring instrument having a support portion for supporting a center measurement object (golf club head) at the top. The central measuring instrument is a measuring object whose support part supports the measuring object in equilibrium. You can know the position of an object. That is, the center measuring method is to find an equilibrium position that does not fall even if the golf club head is placed on the support and released.

[0060] Table 3 below shows the evaluation results for each of the evaluation items described above.

[0061] [Table 3] Table 3

[0062] The strength, resilience, and flight distance are expressed as relative values based on the conventional example as a reference (100). The higher the value, the better the evaluation item. The total score is the sum of evaluation values for strength, rebound, and flight distance, and indicates the overall evaluation value for each golf club head. This total score is expressed as a relative value with the conventional example as the standard (300).

[0063] Strength evaluation was performed by hitting a golf ball with an air cannon tester at a speed of 50 mZ seconds until the golf ball hits the center of the face portion of each golf club head of the conventional example and the example until it was destroyed. Obtained by measuring the number. In this case, the number of hit balls until the conventional example was destroyed was set to 100, and the strength of each example was expressed numerically. [0064] The evaluation of repulsion is defined by the USGA (United States Golf Association) as “Procedure for Measuring the Velocity Ratio of a Club Head for on-mance to Rule 4-le, Appendix II Revision. This was done using the coefficient of restitution of the examples and comparative examples measured based on “2 February 8, 1999”. In this case, the restitution coefficient of the conventional example is set to 100, and the repulsion of each example is represented by a numerical value.

[0065] The flight distance was evaluated using a golf club equipped with the golf club heads of the examples and comparative examples, and a total of 100 amateur golfers and professional golfers with head speeds ranging from 34 m / sec to 50 m / sec. This is the average value obtained by hitting 10 balls for each person.

[0066] Evaluation of the hit feeling was carried out by attaching the golf club heads of the conventional examples and Examples 1 to 16 to a total of 100 amateur golfers and professional golfers with a head speed in the range of 34 mZ seconds to 50 mZ seconds. Each golf club was tested and evaluated.

The evaluation method was to give each person a feel of hitting “too much metal sound” (3-5), “just right” (-2-2), and “too much metal sound” (1-3-5). The score was given, the average value was obtained, and the hit feeling of each example and each comparative example was evaluated with a numerical value of 5-5. As a numerical value, −2 to 2 is a good range for the hit feeling.

[0067] As shown in Table 3 above, Examples 1 to 16 were good in that the total score was higher than that of the conventional example. In particular, in Example 11, the hit feeling with the highest total score is “just good” (−1), so it is semi-IJ.

Also, the hit feeling was relatively good. In particular, those using Ti alloy or SUS alloy on the face surface (Examples 3-6, Examples 9-16) were all “just right” (1-2-2).

[Example b]

The golf club of the present invention will be specifically described in comparison with other examples of the present invention and conventional examples.

In Example b, the conventional examples and Examples 17 to 27 shown in Table 4 below were evaluated in the same manner as in Example a using hit feeling, strength, resilience, and flight distance as evaluation items. It was.

In Example a, a golf club is manufactured using a golf club head of a wood golf club In Example b, a golf club was manufactured by attaching a golf club shaft for TRX-DUO M40 (trade name) manufactured by Yokohama Rubber Co., Ltd. to the golf club head of an iron golf club. An evaluation test was conducted.

[Table 4]

Face surface Face surface Outer layer Face part Face part Resin Back face Face part Face part Face part Face part

σ a] Face Elastic Flexural Elastic Thickness Thickness Number of Layers Film Part Thickness Width L _h

Height Mass w _h Mass w _v Track

Material Material Number of layers Specific gravity ratio Rate

Ι, ΙΤΙΓΠ) i.mm) (layer) Material used (mm) (mm) (mm)

(Layer) (g) (g) E _h (GPa) E _v (GPa) Conventional example Ti alloy 3.0-----Ti alloy 5.0 3.0 40 60--115 115 Example 17 Ti alloy 1.0 Ti alloy 0.13 1 4 Yes CFRP 2.6 3.8 30 80 4.8 3.6 62 78 Example 1 8 Ti alloy 1.0 Ti alloy 0.13 1 4 Yes CFRP 2.6 3.4 35 80 2.4 4.8 69 68 Example 1 9 Ti alloy 1.0 η alloy 0.13 1 4 Yes CFRP 2.6 3.4 30 95 4.2 3.0 68 67 Example 20 Ti alloy 1.0 Ti alloy 0.13 1 4 Yes CFRP 2.6 3.4 25 80 4.8 2.4 69 64 Example 21 Ti alloy 1.0 Ti alloy 0.13 1 4 Yes CFRP 2.9 3.0 31 80 3.6 2.4 68 65 Example 22 Ti Alloy 0.5 Ti alloy 0.13 1 3 Yes Ti alloy 2.5 2.5 35 88 3.6 2.4 69 66 Example 23 Ti alloy 2.5 Ti alloy 0.13 5 1 1 None 合金 ί alloy 3.4 6.0 40 42 3.0 6.0 69 99 Example 24 Ti alloy 2.5 Ti alloy 0.13 1 4 Yes CFRP 3.1 6.1 30 95 3.6 F.2 83 92 Example 25 Ti alloy 1.0 Ti alloy 0.05 3 8 Yes CFRP 2.3 5.7 35 68 3.6 9.6 53 61 Example 26 SUS alloy 2.2 SUS alloy 0.13 1 4 Yes CFRP 4.8 4.6 30 90 2.4 4.8 119 143 Example 27 Ti alloy 1.0 Ti alloy 0.13 1 4 Yes CFRP 3.9 1.7 40 44 0.6 1.2 80 107

[0070] [Table 5] Table 5

[0071] The composition of “Ti alloy” shown in the “Face surface” column of Table 4 is Ti—4.5Al-3V-2Fe—

-3Cr-3A1-3Sn.

[0072] Further, "CFRP" has a fiber Young's modulus of 24 ton type, a pre-preparation basis weight of 298 gZm ² , a fiber basis weight of 200 gZm ² and a resin basis weight of 98 gZm ² and a thickness of 0. 191mm.

Furthermore, a polyurethane resin-based resin film having a thickness of 0.08 mm was used for the “resin film” shown in Table 4.

[0073] The "specific gravity of the face part", "thickness of the face part" and "face part bending elastic modulus" are sampled so that there is always a region having a radius of 15 mm with the center position of the face surface as the center. This is the value when sampling.

The method for measuring the center position of the face surface is the same as in Example _a .

[0074] For each evaluation item described above! The results of the evaluation are shown in Table 6 below.

[0075] [Table 6] Evaluation term

Hitting feel Strength Rebound Flight distance

Conventional example 5 100 100 100 300

Example 1 7-2 120 1 12 1 18 350

Example 1 8 -2 1 16 1 19 1 19 354

Example 1 9 -2 1 17 120 122 359

Example 20-2 1 16 1 19 121 356

Example 21 -1 1 15 125 125 365

Example 22 -1 1 15 125 125 365

Example 23 0 123 90 92 305

Example 24 0 1 10 99 101 310

Example 25-2 108 99 103 310

Example 26 0 1 12 100 99 31 1

Example 27 1 2 90 1 12 1 13 315

[0076] Evaluation of strength, resilience, and flight distance is expressed as a relative numerical value based on the conventional example as a standard (100), and the higher the numerical value, the better the evaluation item. The The total score is the sum of the evaluation values of strength, rebound, and flight distance, and indicates the overall evaluation value of each golf club head. This total score is expressed as a relative value using the conventional example as the standard (300).

Since strength, resilience, and flight distance are measured and evaluated in the same manner as in Example a,

The description is omitted. Further, the hit feeling is also measured and evaluated in the same manner as in Example a, and the description is omitted.

[0077] As shown in Table 6 above, Examples 17 to 27 were favorable in that the total score was higher than that of the conventional example. In particular, in Examples 21 and 22, the hit feeling with the highest total score is “just right” (

— 1) This shows that it is the best.

Further, in Examples 17 to 27, the hit feeling is “just good” (−2 to 2), and it can be seen that the hit feeling is good.

[0078] As described above, the force described in detail for the golf club head according to the present invention. The present invention is not limited to the above-described embodiment, but is within the scope of the present invention.

Various improvements and changes may be made.

Industrial applicability The face part of the golf club head in the present invention includes fiber reinforced plastic layers having different reinforcing fiber orientation angles, and is adjusted according to the mass force orientation angle of the reinforcing fibers in the fiber reinforced plastic. Further, the flexural modulus of the face portion is adjusted according to the height and width of the face surface. Thereby, it is possible to provide a golf club capable of improving the resilience performance while maintaining the strength of the golf club head.

Claims

The scope of the claims

A golf club head having a face portion including a face surface for hitting a golf ball,

The face portion has a fiber reinforced plastic layer including reinforcing fibers having different orientation angles. The width of the face surface, which is the length in the toe and heel directions, is the length in the crown and sole directions. Among the reinforcing fibers included in the fiber reinforced plastic layer, which is larger than the height of the face surface, the direction of the ground contact surface when the golf club is disposed in a normal address position is defined as a reference direction (0 °). The mass of the reinforcing fiber in the range of 55 ° to + 55 °, including the orientation angle of 0 °, and the W force The orientation angle of ± 90 ° is included.

More than 55 ° to −55 ° The weight of the reinforcing fiber in the range of 55 ° W

When the direction of the ground contact surface when the golf club is placed at a normal address position is the reference direction (0 °),

Among the reinforcing fibers contained in the fiber reinforced plastic layer, the mass W of the reinforcing fibers having an orientation angle in the range of 5 ° to + 55 ° including 0 ° and an orientation angle of ± 90 ° + 5 h

Five. Mass of reinforcing fiber in the range of ~ 1 ° 55 W Force of golf club head face face width L and face face height L are set to satisfy the following formula h V

The golf club head according to claim 1.

1/0. 7 X L / (L + L) ≤ W / (W + W) ≤ 2 X L / (L + L)

The face portion has a fiber reinforced plastic layer including reinforcing fibers having different orientation angles. The width of the face surface, which is the length in the toe and heel directions, is the length in the crown and sole directions. The flexural modulus E in the 0 ° direction is greater than the height of the face surface, and the direction of the ground contact surface when the golf club is placed at the normal address position is the reference direction (0 °). Flexural modulus in ± 90 ° direction Golf club head, characterized in that the larger than E _v.

[4] The direction of the contact surface when the golf club is placed at the normal address position is the reference direction

(0 °), the flexural modulus フェース of the face part in the 0 ° direction, and ± 90 °

h

4. The golf club head according to claim 3, wherein the bending elastic modulus E force of the face portion in the direction is set so as to satisfy the following formula according to the width L of the face surface and the height L of the face surface of the golf club head.

1/0. 6 X L / (L + L) ≤ E / (E + E) ≤ 2 X L / (L + L)

V V h v v h v v h

[5] The face part according to any one of claims 1 to 4, wherein the face portion is configured by a laminated structure having a laminated structure in which at least two metal layers and the reinforcing fiber plastic layer are laminated. Golf club head.

6. The golf club head according to claim 5, wherein the metal layer has a thickness of 0.1 to 2 Omm.

7. The golf club head according to claim 5 or 6, wherein the laminated structure of the face part has two or more metal layers to be laminated, and the number of laminated structures is 10 or less. .

[8] The laminated structure of the face portion according to any one of claims 5 to 7, wherein a surface opposite to a face surface for hitting a golf ball is constituted by a surface of a reinforcing fiber plastic layer. Golf club head.

9. The golf club head according to claim 5, wherein, in the laminated structure of the face portion, the face surface for hitting a golf ball is constituted by a surface made of a metal layer. ,.

10. The golf club head according to any one of claims 5 to 8, wherein a specific gravity of a material in a central portion of the face portion in the laminated structure of the face portion is 1.8 to 4.5. .

[11] Of the laminated structure of the face part, the thickness at the center part of the face part is from 2.0

5. The golf club head according to claim 5, wherein the golf club head is Omm and displacement force is 1.

[12] The metal layer and the fiber reinforced plastic layer are bonded to each other by a resin film or an adhesive having a thickness of 0.02 to 1. Omm, according to any one of claims 5 to 11. The listed golf club head.

13. The golf club head according to any one of claims 5 to 11, wherein the face portion has a flexural modulus of 30 to 150 GPa.