JP2003024481A - Golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club head capable of enhancing resilience against a ball while avoiding a decrease in strength of a face part. SOLUTION: In the hollow golf club head comprising a crown part 2 and a sole part 3 both joined to the face part 1, a groove 5 extending along the face 1a is provided in at least either the crown part 2 or the sole part 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club head having improved resilience to a ball, and more particularly to a golf club head adapted to improve resilience to a ball while avoiding reduction in strength of a face portion. .

[0002]

2. Description of the Related Art In a golf club head, it is known that it is effective to reduce the rigidity of the face portion by thinning the face portion in order to improve the resilience against the ball. Therefore, various shapes for reducing the rigidity of the face portion of the golf club head have been proposed. However, if the face portion is made thinner, its durability becomes insufficient.

Therefore, it has been attempted to achieve both durability and resilience of the face portion by making the face portion thinner at the peripheral portion and thicker at the center portion including the sweet area. However, in the golf club head having the face portion thinned at the peripheral edge portion as described above, it is effective when the ball is hit at the face center, but when the ball is hit near the peripheral edge portion of the face without the center, the strength is extremely lowered. There was a problem.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a golf club head capable of improving the resilience against a ball while avoiding a decrease in the strength of the face portion.

[0005]

The golf club head of the present invention for achieving the above object is a golf club head having a hollow structure in which a crown portion and a sole portion are connected to a face portion. And at least one of the sole portions is provided with a groove portion extending along the face surface.

Since the groove portion extending along the face surface is provided on at least one of the crown portion and the sole portion as described above, the resilience against the ball can be improved based on the slight deformation of the portion provided with the groove portion. In addition, it is possible to avoid a decrease in the strength of the face portion.

If the groove is too far from the face surface, the effect of improving the resilience against the ball cannot be sufficiently obtained. Therefore, the minimum distance between an arbitrary position in the width direction of the face surface and the outer end in the width direction of the face surface is Ln, and the height of the face surface at that position is H (Ln),
When the distance between the face surface and the groove portion at that position is C (Ln), it is preferable to satisfy the relationship of C (Ln) <Ln−H (Ln) / 2. Further, in order to more effectively improve the resilience to the ball, it is preferable that the thickness of the portion where the groove is provided is 5 to 20% thinner than the thickness of the portion adjacent to the groove.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The configuration of the present invention will be described in detail below with reference to the accompanying drawings.

1 to 3 show a golf club head according to an embodiment of the present invention. As shown in FIGS. 1 and 2, the golf club head of this embodiment has a hollow structure in which a crown portion 2 and a sole portion 3 are connected to a face portion 1. In addition, this golf club head has a hosel portion 4 for mounting a shaft on the heel side. As a constituent material of the golf club head, a metal such as titanium or aluminum can be used.

In the above golf club head, the crown portion 2 is formed with the groove portion 5 extending along the face surface 1a of the face portion 1, and the portion where the groove portion 5 is provided is locally thin. The groove portion 5 may be provided on at least one of the crown portion 2 and the sole portion 3.

In the golf club head provided with the groove portion 5, when the ball is hit on the face surface 1a, the thinned portion of the groove portion 5 is easily deformed. Therefore, the rigidity of the face portion 1 is substantially reduced, and the resilience against the ball can be improved. Further, since the face portion 1 can have a constant thickness, for example,
Sufficient strength can be secured at any hitting point position. Of course, the wall thickness of the face portion 1 may be different depending on the portion as long as it can maintain sufficient strength.

In the above golf club head, an arbitrary position Pn in the width direction of the face surface 1a and the face surface 1a
Ln is the minimum distance from the outer edge in the width direction of the
The height of the face surface 1a at H is L (Ln), and the distance between the face surface 1a and the groove portion 5 at the position Pn is C (Ln).
Then, it is preferable that the relationship of C (Ln) <Ln−H (Ln) / 2 is satisfied. For example, for arbitrary positions P1, P2, P3 in the width direction of the face surface 1a, C (L
1) <L1-H (L1) / 2, C (L2) <L2-H
The relationship of (L2) / 2, C (L3) <L3-H (L3) / 2 is satisfied. By making the groove portion 5 sufficiently close to the face surface 1a based on the above relation, the resilience against the ball can be improved. That is,
The distance C (Ln) between the face surface 1a and the groove 5 is the distance L
The larger the value of n, the larger the allowable value, and the larger the height H (Ln), the smaller the value of the groove.
It is advisable to form it in an arc shape that is farthest from the face surface 1a at the center portion in the width direction.

However, the distance C (Ln) is specified based on the center position of the groove width of the groove portion 5. Minimum distance Ln
Is the shorter of the distances between the arbitrary position Pn in the width direction of the face surface 1a and the outer ends of the face surface 1a in the toe heel direction. Further, when the contour of the face surface 1a is not clear, the critical position of the area where the hit ball is assumed is determined, and this critical position may be regarded as the contour of the face surface 1a.

FIG. 3 is a sectional view of the groove forming region of the crown portion of the golf club head. As shown in FIG. 3, the thickness t1 of the portion where the groove portion 5 is provided is preferably 5 to 20% thinner than the thickness t of the portion adjacent thereto. In other words, the depth of the groove 5 should be 5 to 20% of the thickness t. By setting the thickness t1 of the portion where the groove portion 5 is provided within the above range, it is possible to effectively improve the resilience against the ball while sufficiently securing the strength of the golf club head.

[0015]

EXAMPLES In a golf club head having a hollow structure in which a crown portion and a sole portion are connected to a face portion, the structures of the face portion and the crown portion are different as follows, a conventional example, a comparative example and an implementation. Each example was made.

Conventional example: The face portion has a uniform thickness of 2.7 mm. Comparative Example: The thickness of the face portion was 2.7 mm in the center portion and 2.2 mm in the peripheral portion.

Example: The face portion has a uniform thickness of 2.7 mm, and as shown in FIGS. 1 to 3, a groove portion extending along the face surface is provided in the crown portion, and the groove portion is provided. The thickness of the part is 2 from the thickness of the part adjacent to it.
Made it 0% thinner. Moreover, the minimum distance between an arbitrary position in the width direction of the face surface and the outer end in the width direction of the face surface is Ln, and the height of the face surface at that position is H (Ln),
When the distance between the face surface and the groove portion at that position is C (Ln), the relationship of C (Ln) <Ln−H (Ln) / 2 is satisfied.

The resilience and durability of these golf club heads were evaluated by the following measuring methods, and the results are shown in Table 1.

Rebound (ball initial velocity): golf clubs equipped with the golf club heads of the conventional example, the comparative example, and the example were prepared, and the sweet spot of the golf club head was set as the hitting point and the head speed was set at 40 m / s. A trial hit was made with a swing robot, and the initial velocity of the ball at that time was measured. The higher the initial velocity of the ball, the better the resilience.

Durability (number of ball collisions): Golf clubs equipped with the golf club heads of the conventional example, the comparative example, and the example were prepared, and the grip portions of the golf clubs were fixed to the golf club heads. The ball was collided at a speed of 60 m / s while changing the hitting point position, and the number of times until the face portion was deformed was counted. The greater the number of ball collisions, the better the durability.

[0021]

[Table 1] As can be seen from Table 1, the golf club head of the example was excellent in both durability and repulsion of the face portion.

[0022]

As described above, according to the present invention, in a golf club head having a hollow structure in which a crown portion and a sole portion are connected to a face portion, at least one of the crown portion and the sole portion has a face surface. Since the groove portion extending along the side is provided, it is possible to improve the resilience against the ball while avoiding the strength reduction of the face portion.

[Brief description of drawings]

FIG. 1 is a plan view showing a golf club head according to an embodiment of the present invention.

FIG. 2 is a front view showing a golf club head according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a groove forming region of the crown portion of the golf club head according to the embodiment of the present invention.

[Explanation of symbols]

1 face part 1a face surface 2 Crown part 3 sole part 4 Hosel part 5 groove

Claims (3)

[Claims] 1. A golf club head having a hollow structure in which a crown portion and a sole portion are connected to a face portion, and at least one of the crown portion and the sole portion is provided with a groove portion extending along a face surface. Club head. 2. An arbitrary position P in the width direction of the face surface.
Let Ln be the minimum distance between n and the outer edge of the face surface in the width direction, and let the height of the face surface at the position Pn be H (L
n) and the distance between the face surface and the groove portion at the position Pn is C (Ln), C (Ln) <Ln−
The golf club head according to claim 1, wherein the relationship of H (Ln) / 2 is satisfied. 3. The golf club head according to claim 1, wherein the thickness of the portion provided with the groove is made 5 to 20% thinner than the thickness of the portion adjacent thereto.