JPH09239074A - Golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable even a beginner who often deviates the position of impact from the central part of the face of a golf club head to obtain the excellent directivity of a hit ball. SOLUTION: The metallic golf club head which is formed with a neck part 11a to be mounted with a shaft at its end and is internally formed as a hollow part is composed of a face member 11 integral molded with the neck part 11a and a hollow member which is welded to the peripheral edge of the face member and forms the hollow part. The face member 11 includes the face part 11b of which the front surface is formed as the face. The face part 11b has both side parts which are arranged on both sides of its central part 11d and has the rigidity higher than the rigidity of the central part 11d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal golf club head in which a neck portion for attaching a shaft is formed at an end and a hollow portion is formed inside.

[0002]

2. Description of the Related Art Generally, as a performance required of a golf club for golf players, the flight distance and directionality of a hit ball are important. Conventionally, regarding the flight distance of a hit ball,
As a material for the golf club head, a material such as titanium or titanium alloy having a high coefficient of restitution is selected, and a shaft is elongated.

[0003] For example, FIG. 8 shows an example of a golf club head such as a driver having a head made of titanium or a titanium alloy (as provided in JP-A-63-154186).
FIG. In this golf club head, the face shell piece 1, the top shell piece 2 and the sole shell piece 3 are produced by pressing titanium or titanium alloy, respectively, and the balance weight 4 is attached to the inner surface of the sole shell piece 3. After that, the plurality of shell pieces 1, 2, 3 are integrated by welding. The face shell piece 1 is formed with a uniform thickness as a whole.

In this golf club head, when the impact is accurately made at the center of the face surface F, the face surface shell piece 1 is formed with a uniform thickness, so that the face surface F is centered on a sphere. The face F can be deformed rearwardly and uniformly with a small amount, and then the face surface F can push out the sphere with a uniform force in the vertical and horizontal directions to strike in a predetermined direction.

[0005]

By the way, the directionality of a hit ball is mainly influenced by the skill of a player. Especially, in the case of a beginner, the position of impact deviates from the center of the face surface. It often happens. That is, in the above conventional golf club head, as shown in FIGS. 9 (a) and 9 (b), when the position of impact on the ball B deviates from the center of the face surface F, the moment acts at the moment of impact. As a result, the face surface F was tilted, and the direction of the shot hit (the direction of the arrow in the figure) was shifted, resulting in an unintended trajectory.

The present invention has been made in view of the above-mentioned problems, and provides a golf club head capable of obtaining an excellent directionality of a hit ball even for a beginner whose impact position is often deviated from the center of the face surface. The purpose is to provide.

[0007]

The present invention has the following features to attain the object mentioned above. That is, in the golf club head according to claim 1, in a metal golf club head in which a neck portion to which a shaft is attached is formed at an end portion and the inside is a hollow portion, a face member integrally molded with the neck portion, A hollow member that is welded to the peripheral portion of the face member to form the hollow portion, and the face member includes a face portion whose surface is a face surface, and the face portion has both sides of a central portion thereof. A technique is adopted that has both side portions that are arranged in the center and have higher rigidity than the central portion.

In this golf club head, the rigidity of both side portions of the face portion is set higher than that of the central portion, so that at the moment of impact, the face surface is slightly deformed rearward around the sphere and its repulsive force is exerted. When the face surface pushes out the ball with, if the impact position shifts from the center to both sides, the pushing force on both sides with high rigidity works strongly, and the launch direction is corrected to the center side, Easy to obtain straight trajectory.

According to another aspect of the golf club head of the present invention,
A technique is adopted in which the both side portions are left and right portions arranged on the left and right sides of the central portion.

In this golf club head, the rigidity of the left and right portions is set higher than that of the central portion, so that when the impact position deviates from the central portion to the left or right (that is, toe side or heel side), the moment of impact occurs. The pushing force on the left and right sides, which has high rigidity, acts strongly on the ball, and the launch direction is corrected to the center side.

According to the golf club head of claim 3,
A technique is adopted in which the both side portions are upper and lower portions arranged above and below the central portion.

In this golf club head, since the rigidity of the upper and lower parts is set higher than that of the central part, when the impact position deviates upward or downward from the central part (that is, the crown side or the sole side), the moment of impact occurs. The pushing force of the upper and lower parts, which has high rigidity, strongly acts on the sphere, and the launch direction is corrected to the central part.

According to the golf club head of claim 4,
A technique is adopted in which the both side portions are peripheral portions arranged so as to surround the central portion.

In this golf club head, the rigidity of the peripheral portion is set to be higher than that of the central portion, so that the rigidity is high at the moment of impact regardless of the position of the impact deviating from the central portion in any direction such as up, down, left and right. The pushing force on the peripheral side strongly acts on the sphere, and the direction of launch is corrected to the central side.

In the golf club head according to claim 5,
In the golf club head according to any one of claims 1 to 4, a technique is adopted in which the face portion has a wall thickness of the central portion set smaller than that of the both side portions.

In this golf club head, since the thickness of the central portion of the face portion is set to be smaller than that of the both side portions, the rigidity of the central portion is lower than that of the both side portions.

In the golf club head according to claim 6,
In the golf club head according to a fifth aspect of the present invention, a technique is adopted in which the face portion has a thickness that is gradually reduced from the both side portions toward the central portion.

In this golf club head, since the wall thickness is gradually reduced from both side portions of the face portion toward the central portion, the rigidity gradually decreases from both side portions toward the central portion, and the impact of the central portion is reduced. The pushing force on both sides added to the ball increases according to the distance to the position,
The launch direction of the hit ball is corrected more accurately.

According to a seventh aspect of the golf club head,
In the golf club head according to any one of claims 1 to 4, the face portion employs a technique in which a plurality of protrusions are formed on the back surfaces of the both side portions.

In this golf club head, since the ridges are formed on the back surfaces of both side portions of the face portion, both side portions are reinforced and the rigidity thereof is higher than that of the central portion.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a club head A (metal head) to which the present invention is applied. The club head A includes a face member 11 and a hollow member 12.

The face member 11 is made of a β-type titanium alloy by hot die forging, which will be described later, and is integrally formed with the neck portion 11a to which the shaft S is attached. As shown in FIGS. 2 and 3, a face portion 11b having a front face F and a face portion 1b.
The rising portion 1 is formed in an annular shape by rising from the peripheral edge of 1b so as to extend in a direction opposite to the direction in which the face surface F faces.
1c. In addition, the startup unit 11c
Are formed with a substantially constant width larger than the diameter of the neck portion 11a.

The face portion 11b is composed of a central portion 11d and peripheral portions 11e (both sides) arranged so as to surround the central portion 11d, and a trapezoidal recess is formed on the back surface R of the central portion 11d. The wall thickness t1 is set smaller than the wall thickness t2 of the peripheral portion 11e. Therefore, the rigidity of the peripheral portion 11e including the left and right portions 11f arranged on the left and right of the central portion 11d and the upper and lower portions 11g arranged on the upper and lower sides is higher than that of the central portion 11d.

The neck portion 11a has an upper portion and a lower portion formed in a circular cross section and a rectangular cross section, respectively, and the lower portion is provided at an end of the face portion 11b. Further, a shaft insertion hole H is formed in the neck portion 11a by machining, and the shaft insertion hole H is formed from the upper end of the neck portion 11a to the lower end through the inside thereof. Is inserted and fixed.

The hollow member 12 is made of a titanium alloy by a precision casting method (lost wax method), and as shown in FIGS. 3 and 4, a crown portion 12a forming an upper portion and side portions. The side portion 12b forming the bottom portion and the sole portion 12c forming the bottom portion are integrally formed. The hollow member 12 is formed with a hollow portion 12e by welding the peripheral edge portion of the face member 11, that is, the rear edge peripheral end portion of the rising portion 11c and the front end peripheral end portion of the hollow member 12 in a butted state. Has been done.

In this embodiment, the central portion 1 of the face portion 11b
The wall thicknesses t1 and t2 of 1d and the peripheral portion 11e are set in the range of 1.5 to 3.5 mm under the condition of t1 <t2, and the Pickers hardness HV of the face portion 11b is set in the range of 280 to 400. It The wall thickness t3 of the hollow member 12 is 0.4 to 8.
The weight of the hollow member 12 is set to 0 mm, and the weight of the hollow member 12 is 1.6 × W to 3.0 × with respect to the weight W of the face member 11.
It is set to the range of W.

The face member 11 is formed by the following manufacturing process. As a material of the face member 11, as shown in FIG. 4, a columnar round bar 20 formed of β-type Ti alloy and having a small diameter portion 20a on one end side is used. First, the stepped round bar 20 is heated to a hot working area and subjected to die forging to obtain the shape of the face member 11. Further, thereafter, aging treatment is directly performed without performing the solution treatment step.

In the above manufacturing process, since the solution heat treatment process is omitted after the hot die forging, the manufacturing process is simplified and the strength is improved by the synergistic effect of work hardening and age hardening. Further, since the metal fibers are formed by forging, the internal metal fibers are in a continuous state even after the processing, so that high strength can be maintained as compared with sheet metal processing or the like.

In the club head A having the above structure,
The thickness t2 of the peripheral portion 11e of the face portion 11b is the central portion 11
Since it is formed thicker than the wall thickness t1 of d and the rigidity of the peripheral portion 11e is set higher than that of the central portion 11d, the face surface F is slightly deformed rearward about the sphere B at the moment of impact, and When the face surface F pushes the sphere B by the repulsive force, the impact position is the central portion 1 as shown in FIG.
Even if it deviates from 1d, the pushing force on the side of the peripheral portion 11e, which has high rigidity, works strongly, and the launch direction is corrected to the side of the central portion 11d (from arrow X in the figure to arrow Y), so a straight trajectory is obtained. easy.

Therefore, the impact position is in the central portion 1.
1d left or right (ie toe side or heel side)
In the case of an athlete having a tendency to shift to the right, the rigidity of the left and right parts 11f is set to be higher than that of the central part 11d, so the pushing force of the left and right parts 11f, which has high rigidity, strongly acts on the ball at the moment of impact and launches The direction is corrected to the side of the central portion 11d, and it is possible to prevent the direction of the hit ball from deviating from side to side.

Further, in the case of an athlete who has a tendency to shift the impact position upward or downward (that is, the crown side or the sole side) from the central portion 11d, the rigidity of the upper and lower portions 11g is set higher than that of the central portion 11d. Therefore, at the moment of impact, the pushing force on the upper and lower portions 11g side having high rigidity acts strongly on the sphere, and the hitting direction is corrected to the central portion 11d side,
It can prevent unintended low trajectory and high trajectory.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 6 shows a club head B to which the present invention is applied.
And a hollow member 32.

The difference between the second form and the first form is that the first form
The face portion 11b of the club head A of the second embodiment has a trapezoidal recess formed in the center portion 11d thereof, while the face portion 31 of the club head B of the second embodiment has a trapezoidal recess.
The back surface R of the a is concave and the peripheral portion 31
The point is that the thickness is gradually reduced from b to the central portion 31c.

That is, in this club head B, since the wall thickness is gradually reduced from the peripheral portion 31b to the central portion 31c of the face portion 31a, the rigidity is gradually lowered from the peripheral portion 31b toward the central portion 31c. Therefore, the pushing force on the peripheral portion 31b side added to the ball increases in accordance with the distance displaced from the central portion 31c to the impact position, and the launch direction of the hit ball is corrected more accurately.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 7 shows a face member 41 of a club head to which the present invention is applied.

The difference between the third form and the first form is that the first form
The face portion 11b of the club head A of the third embodiment has a trapezoidal recess formed in the central portion 11d thereof, whereas the face portion 41a of the club head of the third embodiment has a face portion 41a.
Has its rear surface R formed into a flat surface and its peripheral portion 4
The point is that a plurality of ribs (protrusions) 42 that extend radially are formed on 1b (eight in this embodiment). The ribs 42 are formed so as to be gradually higher from the central portion 41c side.

That is, in the club head of the third form,
Since the ribs 42 are radially formed on the peripheral portion 41b of the face portion 41a, the peripheral portion 41b is reinforced and its rigidity becomes higher than that of the central portion 41c. The rib 42 is
Since the height gradually increases from the side of the central portion 41c, the peripheral portion 41b is reinforced more strongly toward the peripheral edge side and has higher rigidity.

The present invention also includes the following embodiments. (1) In each of the above-described embodiments, the rigidity of the peripheral portion that surrounds the central portion is increased, but the rigidity of the other portions may be set to be high if both side portions are disposed on both sides of the central portion. Absent. In particular, if only the left and right parts of the center part are made to have high rigidity, when the impact position shifts up or down from the center part, correction is added to the launching direction of the hit ball, and When only the arranged upper and lower parts are made to have high rigidity, when the impact position deviates from the center part to the left or right, the hitting direction of the hit ball is corrected. Further, if the rigidity of the entire peripheral portion is increased, correction is added to the launching direction of the hit ball even if it shifts from the central portion in any direction.

(2) In each of the above embodiments, the golf club head has a two-piece structure composed of a face member and a hollow member, but the hollow member may be composed of a plurality of members. For example, a golf club head having a three-piece structure in which a pure titanium plate press-punched product is fitted in the sole portion of the hollow member may be used. (3) In the first embodiment, the central portion 11d has a trapezoidal recess formed on the back surface R to have a thickness smaller than that of the peripheral portion 11. However, the thickness may be reduced by another shape. For example, the recess may be formed in a circular shape, an elliptical shape, or a polygonal shape.

(4) The rib 42 in the third embodiment is formed so as to be gradually higher from the central portion 41c side, but if it is formed so that the rigidity of the peripheral portion 41b increases as the distance from the central portion 41c increases. Other shapes and arrangements are also possible. For example, the width of the rib may be gradually widened from the central portion side, or the number of ribs may be increased as the rib is spaced apart from the central portion.

(5) The ribs 42 in the third embodiment are formed radially from the side of the central portion 41c, but as long as a plurality of ribs 42 are formed on the back surface of the peripheral portion, they may be protrusions arranged in another arrangement. For example, the protrusions may be formed in a lattice pattern on the back surface of the peripheral portion.

[0042]

According to the present invention, the following effects can be obtained. (1) According to the golf club head of claim 1, the rigidity of both side portions of the face portion is set higher than that of the central portion, so that even if the impact position shifts from the central portion to both side portions, both sides Since the pushing force on the part side works strongly and the launch direction is corrected to the central part side, it is possible to obtain a straight trajectory and a stable directionality of the hit ball.

(2) According to the golf club head of the second aspect, since the rigidity of the left and right portions is set higher than that of the central portion, even if the impact position deviates from the central portion to the left or right, the left and right portions The pushing force of the side strongly acts on the ball, and the launch direction can be corrected to the central side. Therefore,
Even a player who has a tendency to shift the impact position from the center part to the left and right can prevent the direction of the hit ball from varying from side to side.

(3) According to the golf club head of the third aspect, since the rigidity of the upper and lower parts is set higher than that of the central part, the upper and lower parts are not affected even if the impact position deviates from the central part to the upper part or the lower part. The pushing force of the side strongly acts on the ball, and the launch direction can be corrected to the central side. Therefore,
Even a player who has a tendency to shift the impact position vertically from the center can prevent unintended low trajectory and high trajectory.

(4) According to the golf club head of the fourth aspect, since the rigidity of the peripheral portion is set higher than that of the central portion, the impact position is displaced from the central portion in any direction, not only in the vertical and horizontal directions. Also, the pushing force on the peripheral side strongly acts on the sphere, and the launch direction can be corrected to the central side. Therefore, even a beginner whose impact position is likely to deviate from the center portion can easily obtain an accurate and stable excellent hitting directionality.

(5) According to the golf club head of the fifth aspect, since the thickness of the central portion of the face portion is set to be thinner than that of both side portions, the rigidity of the central portion is set to be lower than that of both side portions. By changing the wall thickness, it is possible to easily set the difference in rigidity between the central portion and both side portions.

(6) According to the golf club head of the sixth aspect, since the wall thickness is gradually reduced from both side portions of the face portion toward the center portion, there is a deviation from the center portion to the impact position. The pushing force applied to both sides of the ball increases according to the distance, so that the launch direction of the hit ball can be corrected more accurately, and a more stable directionality of the hit ball can be obtained.

(7) According to the golf club head of the seventh aspect, since the ridges are formed on the back surfaces of both side portions of the face portion, both side portions are reinforced and the rigidity thereof is higher than that of the central portion. Therefore, the difference in rigidity between the central portion and both side portions can be set only by the ribs without changing the thickness of the entire face portion. Therefore, it is possible to reduce the thickness of the entire face portion, reduce the weight of the golf club head, and increase the capacity of the golf club head.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first mode of a golf club head according to the present invention.

FIG. 2 is a perspective view showing a face member in a first mode of the golf club head according to the present invention.

FIG. 3 is a vertical sectional view showing a first mode of the golf club head according to the present invention.

FIG. 4 is a perspective view showing a stepped round bar which is a material of a face member in the first mode of the golf club head according to the present invention.

FIG. 5 is a transverse cross-sectional view of the main parts showing the first mode of the golf club head according to the present invention.

FIG. 6 is a transverse cross-sectional view of a main part showing a second mode of the golf club head according to the present invention.

FIG. 7 is a perspective view showing a face member in a third mode of the golf club head according to the present invention.

FIG. 8 is an exploded perspective view showing a conventional example of a golf club head according to the present invention.

FIG. 9 is a transverse cross-sectional view of a main part at the time of impact showing a conventional example of the golf club head according to the present invention.

[Explanation of symbols]

 11, 31, 41 Face member 11a Neck part 11b, 31a, 41a Face part 11c Standing part 11d, 31c, 41c Central part 11e, 31b, 41b Peripheral part 11f Left and right part 11g Upper and lower parts 12,32 Hollow member 12a Crown part 12b Side part 12c Sole part 12e Hollow part 42 Rib A, B Golf club head F Face surface R Back surface t1 Central thickness t2 Peripheral thickness

Claims (7)

[Claims] 1. A metal golf club head, wherein a neck portion for mounting a shaft is formed at an end portion and a hollow portion is formed inside, a face member integrally formed with the neck portion, and a peripheral portion of the face member. And a hollow member that is welded to form the hollow portion, wherein the face member has a face portion whose surface is a face surface, and the face portion is arranged on both sides of the central portion, and A golf club head having both sides having high rigidity. 2. The golf club head according to claim 1, wherein the both side portions are left and right portions arranged on the left and right sides of the central portion. 3. The golf club head according to claim 1, wherein the both side portions are upper and lower portions arranged above and below the central portion. 4. The golf club head according to claim 1, wherein the both side portions are peripheral portions arranged so as to surround the central portion. 5. The golf club head according to claim 1, wherein a thickness of the face portion of the face portion is set to be smaller than that of the both side portions. Club head. 6. The golf club head according to claim 5, wherein the face portion has a thickness that is gradually reduced from the both side portions toward the center portion. 7. The golf club head according to claim 1, wherein the face portion has a plurality of protrusions formed on the back surfaces of the both side portions. .