JP7657446B2 - Golf Club Head - Google Patents

Description

Article 30, paragraph 2 of the Patent Act applies. The product was shipped to the sales agent and listed on the website. (Date of shipment and publication: October 14, 2020)

The present invention relates to a golf club head.

Conventionally, golf club heads having faces made of the same material are known (see, for example, Patent Document 1).

JP 2003-102882 A

In golf club heads, it is desirable to increase the hardness of the face to improve its strength, but increasing the hardness makes it difficult to bend, which creates the problem of making it difficult to improve the flight distance.

The present invention was made in consideration of these points, and aims to provide a golf club head that improves the flight distance of a hit ball.

In a first aspect of the present invention, a golf club head having a hollow space is provided, and a face portion in contact with the space has a central face member provided in an impact area and an outer face member provided outside the impact area, and the tensile strength of the outer face member is greater than the tensile strength of the central face member, the yield strength of the outer face member is greater than the yield strength of the central face member, and the hardness of the central face member is less than the hardness of the outer face member.

The central face member may have a V-shaped protrusion formed on the surface facing the space. The thickness of the outer face member may be smaller than the thickness of the central face member.

The face portion may have, as the outer face members, a first outer face member provided in a right region including the right end of the face portion and a second outer face member provided in a left region including the left end of the face portion, and the central face member may be sandwiched between the first outer face member and the second outer face member.

In addition, a convex portion protruding into the space may be formed along the outer periphery of the central face member, the outer face member may have an opening that accommodates the central face member, and a concave portion to which the convex portion of the central face member is joined may be formed along the outer periphery of the opening.

The present invention has the effect of improving the flight distance of a golf club head.

1 shows a configuration of a golf club head according to a first embodiment. 1 shows the structure of a central face member. 1 shows the structure of the face portion as viewed from the rear side of the golf club head. 5A to 5C are schematic diagrams showing changes in the shape of a face portion when hitting a ball. The results of test shots using golf club heads are shown. 4 shows a configuration of a golf club head according to a second embodiment. FIG. 13 is a diagram showing a state in which a central face member is removed from a golf club head according to a second embodiment. FIG. 2 is a cross-sectional view of the vicinity of a convex portion and a concave portion.

First Embodiment
[Outline of Golf Club Head S]
FIG. 1 is a diagram showing a configuration of a golf club head S according to the first embodiment.
The golf club head S is provided at the bottom end of the golf club and is the part of the golf club that hits the golf ball. The golf club head S has a hollow space. The golf club head S has a face portion 1, a crown portion 2, a sole portion 3, and a hosel portion 4.

The face portion 1 is a plate-like portion that forms the front surface of the golf club head S. The face portion 1 has a smoothly curved surface. The face portion 1 is in contact with the hollow space of the golf club head S. The rear end of the face portion 1 is connected to the front edge of the crown portion 2, which will be described later, and the front edge of the sole portion 3. Details of the face portion 1 will be described later. The crown portion 2 is a plate-like portion that forms the upper surface of the golf club head S. The crown portion 2 has a smoothly curved surface.

The sole portion 3 is a plate-like portion that forms the bottom surface of the golf club head S. The sole portion 3 has a curved surface that is convex downward. The hosel portion 4 is a portion for connecting a shaft (not shown) to the golf club head S. The hosel portion 4 is, for example, cylindrical in shape.

[Structure of face portion 1]
Fig. 2 is a diagram showing the structure of the central face member 11. Fig. 3 is a diagram showing the structure of the face portion 1 as viewed from the rear side of the golf club head S. Fig. 3 is a diagram showing the structure of the face portion 1 as viewed from the inner space side of the golf club head S.

The face portion 1 has a central face member 11 and an outer face member 12. The central face member 11 is provided in an area that is the same as the impact area or that includes the impact area and is wider than the impact area. The impact area is the area of the face portion 1 that is intended to collide with a golf ball, and is defined by the golf equipment rules. The impact area is, for example, a strip-shaped area that passes through the center of the face portion 1 in the left-right direction and has a width of 42.67 millimeters.

As shown in Figures 1 and 2, the central face member 11 has a smooth curved surface, and an area extending toward the rear of the golf club head S is formed at each of the upper and lower ends in the height direction of the golf club head S. The central face member 11 has a first tensile strength, a first yield strength, and a first hardness. The central face member 11 is made of at least one of maraging steel, titanium, stainless steel, tungsten, and molybdenum. The central face member 11 is welded to the outer face member 12 described below.

The outer face member 12 is provided outside the impact area. The outer face member 12 has a second tensile strength, a second yield strength, and a second hardness. The second tensile strength is greater than the first tensile strength. The second yield strength is greater than the first yield strength. The second hardness is greater than the first hardness. The outer face member 12 is made of at least one of titanium, stainless steel, tungsten, or molybdenum, for example.

The golf club head S thus has a central face member 11 with the face portion 1 provided in the impact area, and an outer face member 12 provided outside the impact area. The tensile strength of the outer face member 12 is greater than the tensile strength of the central face member 11. The yield strength of the outer face member 12 is greater than the yield strength of the central face member 11. The hardness of the central face member 11 is less than the hardness of the outer face member 12.

Therefore, in the golf club head S, the outer face member 12 is more flexible than the central face member 11, so when the central face member 11 comes into contact with the golf ball when hitting the ball, the outer face member 12 is flexible, which makes the central face member 11 more likely to move backward. Also, since the central face member 11 is softer than the outer face member 12, the central face member 11 is more likely to deform at the moment of impact, and the repulsion force is greater. These actions improve the flight distance performance of the golf club head S.

Figure 4 is a schematic diagram showing the change in shape of the face portion 1 when hitting a ball. Figure 4(a) is a diagram showing a state in which the outer face member 12 is not bent. Figure 4(b) is a diagram showing a state in which the outer face member 12 is bent. As shown in Figure 4(b), when the outer face member 12 bends and the central face member 11 moves backward, a restoring force is generated that causes the bent outer face member 12 to return to its original shape. As a result, in the golf club head S, the restoring force generated when the bent outer face member 12 returns to its original shape can be used to push the golf ball U forward. Therefore, in the golf club head S, the flight distance when hitting the ball can be improved.

As shown in Figures 2 and 3, the central face member 11 has a protruding portion 111. The protruding portion 111 is formed on the surface of the central face member 11 facing the hollow space of the golf club head S. The protruding portion 111 is V-shaped.

The central face member 11 is provided with a convex portion 111, which includes a convex portion 111R and a convex portion 111L. The convex portion 111R is provided to the right of the center of the central face member 11 in the left-right direction. The convex portion 111R has a first region 112R and a second region 113R. The first region 112R is a linear region that extends so as to approach the center of the central face member 11 in the left-right direction as it moves upward in the height direction of the central face member 11. The second region 113R is a linear region that extends so as to approach the center of the central face member 11 in the left-right direction as it moves downward in the height direction of the central face member 11. The upper end of the second region 113R is connected to the lower end of the first region 112R.

The first region 112R and the second region 113R are symmetrical in the height direction of the central face member 11, with the connection point between the lower end of the first region 112R and the upper end of the second region 113R as the center.

The convex portion 111L is a convex portion provided to the left of the center in the left-right direction of the central face member 11. The convex portion 111L has a first region 112L and a second region 113L. The first region 112L is a linear region that extends so as to approach the center in the left-right direction of the central face member 11 as it moves upward in the height direction of the central face member 11. The second region 113L is a linear region that extends so as to approach the center in the left-right direction of the central face member 11 as it moves downward in the height direction of the central face member 11. The upper end of the second region 113L is connected to the lower end of the first region 112L.

The first region 112L and the second region 113L are symmetrical in the height direction of the central face member 11, with the connection point between the lower end of the first region 112L and the upper end of the second region 113L as the center.

The convex portions 111R and 111L are symmetrical with respect to the center line in the left-right direction of the central face member 11. In addition, the connection point between the lower end of the first region 112R and the upper end of the second region 113R in the convex portion 111R, and the connection point between the lower end of the first region 112L and the upper end of the second region 113L in the convex portion 111L are located at the center in the height direction of the central face member 11.

In the golf club head S, the L-shaped protrusion 111 is formed on the surface of the central face member 11 facing the hollow space of the golf club head S, which prevents the central face member 11 from bending when hitting the ball. As a result, the golf club head S can prevent the force transmitted from the central face member 11 to the golf ball when hitting the ball from escaping, for example, in the left-right direction of the golf club head S. In addition, in the golf club head S, the L-shaped protrusion 111 that protrudes outward in the left-right direction of the central face member 11 is formed in this way, which ensures sufficient strength of the central face member 11 and increases the area of the central face member 11's thin central region.

As an example, the thickness of the outer face member 12 is smaller than the thickness of the central face member 11. In this case, the outer face member 12 is more easily bent than the central face member 11. As a result, in the golf club head S, since the thickness of the outer face member 12 is smaller than the thickness of the central face member 11 in this way, it is easier to ensure the flight distance even if the golf ball hits a position outside the impact area of the golf club head S when hitting the ball.

The face section 1 has a first outer face member 121R and a second outer face member 121L as the outer face members 12. The first outer face member 121R is provided in a right region including the right end of the face section 1. The second outer face member 121L is provided in a left region including the left end of the face section 1. The central face member 11 is sandwiched between the first outer face member 121R and the second outer face member 121L. The right end of the central face member 11 is connected to the left end of the first outer face member 121R. The left end of the central face member 11 is connected to the right end of the second outer face member 121L.

In the golf club head S, the central face member 11 is sandwiched between the first outer face member 121R and the second outer face member 121L in this manner. Therefore, in the golf club head S, it is easier to suppress twisting in the left-right direction of the golf club head S when hitting the ball. Also, in the golf club head S, with the outer face member 12 that is more flexible than the central face member 11 provided, the area of the central face member 11 in the height direction can be increased.

[Trial Hit Test Using Golf Club Head S According to First Embodiment]
Next, the results of a test hit test using the golf club head S according to the first embodiment will be shown. In the test hit test, 16 golf club heads S were prepared by changing the material of the central face member 11 and the material of the outer face member 12. In the test hit test, test hits were performed using the different golf club heads S, and the flight distances at the time of hitting the ball were measured.

Figure 5 shows the results of a test shot using the golf club head S. The hardness in Figure 5 indicates Rockwell hardness.

Examples 1 and 2 are test results of a golf club head S in which the face portion 1 has a central face member 11 made of material E and an outer face member 12 made of material E. In Examples 1 and 2, the tensile strength (102 kgf/mm ² ) and yield strength (92 kgf/mm ² ) of the outer face member 12 are the same as the tensile strength (102 kgf/mm ² ) and yield strength (92 kgf/mm ² ) of the central face member 11, respectively. In Example 1, the hardness (31.5) of the central face member 11 is smaller than the hardness (35) of the outer face member 12, and in Example 2, the hardness (35) of the central face member 11 is larger than the hardness (31.5) of the outer face member 12. In Example 1, the flight distance at the time of hitting the ball was 269 yards. In Example 2, the flight distance at the time of hitting the ball was 265 yards.

Example 3 shows test results for a golf club head S in which the face portion 1 has a central face member 11 made of material H and an outer face member 12 made of material E. In Example 3, the tensile strength (102 kgf/ ^mm2 ) and yield strength (92 kgf/ ^mm2 ) of the outer face member 12 are smaller than the tensile strength (125 kgf/ ^mm2 ) and yield strength (117 kgf/ ^mm2 ) of the central face member 11, respectively. Also, in Example 3, the hardness (35) of the central face member 11 is greater than the hardness (31.5) of the outer face member 12. In Example 3, the flight distance when hitting the ball was 267 yards.

Examples 4 and 5 are test results of a golf club head S in which the face portion 1 has a central face member 11 made of material H and an outer face member 12 made of material A. In Examples 4 and 5, the tensile strength (136 kgf/mm ² ) and yield strength (126 kgf/mm ² ) of the outer face member 12 are greater than the tensile strength (125 kgf/mm ² ) and yield strength (117 kgf/mm ² ) of the central face member 11, respectively. In Example 4, the hardness (40) of the central face member 11 is the same as the hardness (40) of the outer face member 12, and in Example 5, the hardness (35) of the central face member 11 is less than the hardness (40) of the outer face member 12. In Example 4, the flight distance at the time of hitting the ball was 268 yards. In Example 5, the flight distance at the time of hitting the ball was 275 yards.

Example 6 shows test results for a golf club head S in which the face portion 1 has a central face member 11 made of material H and an outer face member 12 made of material F. In Example 6, the tensile strength (130 kgf/ ^mm2 ) and yield strength (120 kgf/ ^mm2 ) of the outer face member 12 are greater than the tensile strength (125 kgf/ ^mm2 ) and yield strength (117 kgf/ ^mm2 ) of the central face member 11, respectively. Also, in Example 6, the hardness (40) of the central face member 11 is greater than the hardness (35) of the outer face member 12. In Example 6, the flight distance when hitting the ball was 271 yards.

Example 7 shows the test results of a golf club head S in which the face portion 1 has a central face member 11 made of material D and an outer face member 12 made of material E. In Example 7, the tensile strength (102 kgf/ ^mm2 ) and yield strength (92 kgf/ ^mm2 ) of the outer face member 12 are smaller than the tensile strength (130 kgf/ ^mm2 ) and yield strength (117 kgf/ ^mm2 ) of the central face member 11, respectively. Also, in Example 7, the hardness (42) of the central face member 11 is greater than the hardness (31.5) of the outer face member 12. In Example 7, the flight distance when hitting the ball was 270 yards.

Example 8 shows test results for a golf club head S having a face portion 1 made of a central face member 11 made of material D and an outer face member 12 made of material F. In Example 8, the tensile strength (130 kgf/ ^mm2 ) of the outer face member 12 is the same as the tensile strength (130 kgf/ ^mm2 ) of the central face member 11, and the yield strength (120 kgf/ ^mm2 ) of the outer face member 12 is greater than the yield strength (117 kgf/ ^mm2 ) of the central face member 11. Also, in Example 8, the hardness (42) of the central face member 11 is greater than the hardness (35) of the outer face member 12. In Example 8, the flight distance when hitting the ball was 271 yards.

Examples 9 to 12 show test results for a golf club head S in which the face portion 1 has a central face member 11 made of material G and an outer face member 12 made of material G. In Examples 9 to 12, the tensile strength (126.5 kgf/mm ² ) and yield strength (118.5 kgf/mm ² ) of the outer face member 12 are the same as the tensile strength (126.5 kgf/mm ² ) and yield strength (118.5 kgf/mm ² ) of the central face member 11, respectively.

In Example 9, the hardness (35) of the central face member 11 is the same as the hardness (35) of the outer face member 12. In Example 10, the hardness (40) of the central face member 11 is the same as the hardness (40) of the outer face member 12. In Example 11, the hardness (35) of the central face member 11 is smaller than the hardness (40) of the outer face member 12, and in Example 12, the hardness (40) of the central face member 11 is larger than the hardness (35) of the outer face member 12. In Example 9, the flight distance when the ball was hit was 269 yards. In Example 10, the flight distance when the ball was hit was 272 yards. In Example 11, the flight distance when the ball was hit was 275 yards. In Example 12, the flight distance when the ball was hit was 274 yards.

Example 13 shows test results for a golf club head S in which the face portion 1 has a central face member 11 made of material G and an outer face member 12 made of material F. In Example 13, the tensile strength (130 kgf/ ^mm2 ) and yield strength (120 kgf/ ^mm2 ) of the outer face member 12 are greater than the tensile strength (126.5 kgf/ ^mm2 ) and yield strength (118.5 kgf/ ^mm2 ) of the central face member 11, respectively. Also, in Example 13, the hardness (35) of the central face member 11 is the same as the hardness (35) of the outer face member 12. In Example 13, the flight distance when hitting the ball was 271 yards.

Example 14 shows the test results of a golf club head S in which the face portion 1 has a central face member 11 made of material G and an outer face member 12 made of material I. In Example 14, the tensile strength (149 kgf/ ^mm2 ) of the outer face member 12 is greater than the tensile strength (126.5 kgf/ ^mm2 ) of the central face member 11, and the yield strength (110 kgf/ ^mm2 ) of the outer face member 12 is less than the yield strength (118.5 kgf/ ^mm2 ) of the central face member 11. In Example 14, the hardness (40) of the central face member 11 is greater than the hardness (36) of the outer face member 12. In Example 14, the flight distance at the time of hitting the ball was 272 yards.

Example 15 shows test results of a golf club head S in which the face portion 1 has a central face member 11 made of material G and an outer face member 12 made of material F. In Example 15, the tensile strength (130 kgf/ ^mm2 ) and yield strength (120 kgf/ ^mm2 ) of the outer face member 12 are greater than the tensile strength (126.5 kgf/ ^mm2 ) and yield strength (118.5 kgf/ ^mm2 ) of the central face member 11, respectively. Also, in Example 15, the hardness (35) of the central face member 11 is less than the hardness (40) of the outer face member 12. In Example 15, the flight distance when hitting the ball was 278 yards.

Example 16 shows test results of a golf club head S in which the face portion 1 has a central face member 11 made of material G and an outer face member 12 made of material P. In Example 16, the tensile strength (281.3 kgf/ ^mm2 ) and yield strength (278.8 kgf/ ^mm2 ) of the outer face member 12 are greater than the tensile strength (126.5 kgf/ ^mm2 ) and yield strength (118.5 kgf/ ^mm2 ) of the central face member 11, respectively. Also, in Example 16, the hardness (40) of the central face member 11 is less than the hardness (53) of the outer face member 12. In Example 16, the flight distance when hitting the ball was 277 yards.

(Analysis of test results)
In Examples 5, 15, and 16, which have relatively long flight distances, the tensile strength of the outer face member 12 is greater than that of the central face member 11, the yield strength of the outer face member 12 is greater than that of the central face member 11, and the hardness of the central face member 11 is less than that of the outer face member 12. From this, it was confirmed that the flight distance performance is improved by the tensile strength of the outer face member 12 being greater than that of the central face member 11, the yield strength of the outer face member 12 being greater than that of the central face member 11, and the hardness of the central face member 11 being less than that of the outer face member 12.

In addition, when comparing Example 5 and Example 4, only the hardness of the central face member 11 is different. The hardness of the central face member 11 in Example 5 is smaller than the hardness of the central face member 11 in Example 4, and the flight distance when hitting the ball in Example 5 is greater than the flight distance when hitting the ball in Example 4. From this, it was confirmed that the flight distance performance is improved by having a smaller hardness of the central face member 11.

In addition, when comparing Example 15 and Example 13, only the hardness of the outer face member 12 is different. The hardness of the outer face member 12 in Example 15 is greater than the hardness of the outer face member 12 in Example 13, and the flight distance when hitting the ball in Example 15 is greater than the flight distance when hitting the ball in Example 13. From this, it was confirmed that the flight distance performance is improved by having a smaller hardness of the central face member 11.

Furthermore, when comparing Example 15 and Example 11, only the tensile strength and yield strength of the outer face member 12 are different. The tensile strength and yield strength of the outer face member 12 in Example 15 are greater than the tensile strength and yield strength of the outer face member 12 in Example 11, respectively, and the flight distance when hitting a ball in Example 15 is greater than the flight distance when hitting a ball in Example 11. From this, it was confirmed that the flight distance performance is improved by the tensile strength and yield strength of the outer face member 12 being greater than the tensile strength and yield strength of the central face member 11.

[Modification]
In the above embodiment, an example has been shown in which the face portion 1 has the central face member 11 and the outer face member 12, but the present invention is not limited to this. The central face member 11 and the outer face member 12 may be formed integrally.

[Effects of the Golf Club Head S According to the First Embodiment]
The golf club head S of the first embodiment is a golf club head S having a hollow space, and the face portion 1 in contact with the space has a central face member 11 provided in the impact area and an outer face member 12 provided outside the impact area, and the tensile strength of the outer face member 12 is greater than the tensile strength of the central face member 11, the yield strength of the outer face member 12 is greater than the yield strength of the central face member 11, and the hardness of the central face member 11 is less than the hardness of the outer face member 12.

The golf club head S has a central face member 11 with a face portion 1 provided in the impact area and an outer face member 12 provided outside the impact area, and the tensile strength of the outer face member 12 is greater than that of the central face member 11, the yield strength of the outer face member 12 is greater than that of the central face member 11, and the hardness of the central face member 11 is less than that of the outer face member 12. Therefore, in the golf club head S, the outer face member 12 is more easily bent than the central face member 11, so that when the central face member 11 comes into contact with the golf ball when hitting the ball, the outer face member 12 is bent, and the central face member 11 is more likely to move backward. As a result, in the golf club head S, the golf ball can be pushed forward by utilizing the restoring force generated when the bent outer face member 12 returns to its original shape. Therefore, in the golf club head S, the flight distance when hitting the ball can be improved.

Second Embodiment
FIG. 6 is a diagram showing the configuration of a golf club head Sa according to a second embodiment. FIG. 6(a) is a diagram showing the structure of the golf club head Sa seen from the front side. FIG. 6(b) is a cross-sectional view taken along the line X-X in FIG. 6(a). FIG. 7 is a diagram showing a state in which the central face member 11a is removed from the golf club head Sa according to the second embodiment. FIG. 7(a) is a diagram showing a structure in which the central face member 11a is removed from the golf club head Sa seen from the front side. FIG. 7(b) is a cross-sectional view taken along the line Y-Y in FIG. 7(a). FIG. 8 is a cross-sectional view of the vicinity of the convex portion 114a and the concave portion 123a. FIG. 8 corresponds to an enlarged view of the area A in FIG. 6(b).

The golf club head Sa according to the second embodiment differs from the golf club head S according to the first embodiment in that it has a central face member 11a and an outer face member 12a instead of a central face member 11 and an outer face member 12.

The golf club head Sa has a hollow space, similar to the golf club head S. The golf club head Sa has a face portion 1a, a crown portion 2, a sole portion 3, and a hosel portion 4. Similar to the face portion 1, the face portion 1a is a plate-shaped portion that forms the front surface of the golf club head Sa. Similar to the face portion 1, the face portion 1a is in contact with the hollow space of the golf club head Sa. Similar to the face portion 1, the rear end of the face portion 1a is connected to the front edge of the crown portion 2 and the front edge of the sole portion 3.

The face portion 1a has a central face member 11a and an outer face member 12a. The central face member 11a is provided in the impact area, similar to the central face member 11. The central face member 11a has a first tensile strength, a first yield strength, and a first hardness, similar to the central face member 11. The central face member 11a is made of at least one of maraging steel, titanium, stainless steel, tungsten, and molybdenum, similar to the central face member 11. The central face member 11a is accommodated in an opening 122a of the outer face member 12a, which will be described later. The central face member 11a has a protruding portion 114a. The protruding portion 114a protrudes toward the hollow space of the golf club head Sa. The protruding portion 114a is formed along the outer periphery of the central face member 11a.

The outer face member 12a is provided outside the impact area, similar to the outer face member 12. The outer face member 12a has a second tensile strength, a second yield strength, and a second hardness, similar to the outer face member 12. The outer face member 12a is made of at least one of titanium, stainless steel, tungsten, and molybdenum, similar to the outer face member 12. The upper and lower ends of the outer face member 12a each have an area extending toward the rear. The rear end of the outer face member 12a is connected to the edge of the front end of the crown portion 2 and the edge of the front end of the sole portion 3.

The outer face member 12a has an opening 122a and a recess 123a. The opening 122a accommodates the central face member 11a. The recess 123a is a recess to which the protrusion 114a of the central face member 11a is joined. The recess 123a is recessed toward the hollow space of the golf club head Sa. The recess 123a is formed along the outer periphery of the opening 122a. The end of the protrusion 114a is inserted into the recess 123a and welded to be fixed.

In the golf club head Sa, the face portion 1a thus has a central face member 11a on which a convex portion 114a is formed, and an outer face member 12a on which a concave portion 123a to which the convex portion 114a is joined is formed. The convex portion 114a is formed along the outer periphery of the central face member 11a, and the concave portion 123a is formed along the outer periphery of the opening 122a in which the central face member 11a is housed.

Therefore, in the golf club head Sa, the bonding strength between the central face member 11a and the outer face member 12a can be improved. Also, in the golf club head Sa, the face portion 1a can have an area where two plates formed along the outer periphery of the central face member 11a are overlapped. As a result, in the golf club head Sa, the strength of the face portion 1a can be improved.

Although the present invention has been described above using embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist of the invention. For example, all or part of the device can be configured by distributing or integrating functionally or physically in any unit. In addition, new embodiments resulting from any combination of multiple embodiments are also included in the embodiments of the present invention. The effect of the new embodiment resulting from the combination also has the effect of the original embodiment.

S, Sa...golf club head 1, 1a...face portion 11, 11a...central face member 111, 111R, 111L...projection portion 112R, 112L...first region 113R, 113L...second region 114a...projection portion 12, 12a...outer face member 121R...first outer face member 121L...second outer face member 122a...opening 123a...recess 2...crown portion 3...sole portion 4...hosel portion U...golf ball

Claims (4)

A golf club head having a hollow space,
A face portion in contact with the space is
a central face member provided in the impact area;
an outer face member provided outside the impact area;
having
the outer face member has a tensile strength greater than the tensile strength of the central face member, the outer face member has a yield strength greater than the yield strength of the central face member,
the hardness of the central face member is less than the hardness of the outer face member;
The thickness of the outer face member is smaller than the thickness of the central face member.
Golf club head. A dogleg-shaped protrusion is formed on the surface of the central face member facing the space.
The golf club head of claim 1 . The face portion is
The golf club has, as the outer face members, a first outer face member provided in a right region including a right end of the face portion, and a second outer face member provided in a left region including a left end of the face portion,
The central face member is sandwiched between the first outer face member and the second outer face member.
3. The golf club head according to claim 1 . A protrusion protruding toward the space is formed along an outer periphery of the central face member,
The outer face member has an opening for receiving the central face member, and a recess for receiving a protrusion of the central face member is formed along an outer periphery of the opening.
3. The golf club head according to claim 1 .

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