Driver club head

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a driver club head, and more particularly to a metal driver club head for golf having a hollow structure as a whole having a predetermined wall thickness distribution on the face surface.

【0002】

[Conventional technology]

It is important for the driver club to fly the ball well, but it is also important to increase the probability of so-called nice shots. Therefore, conventionally, the head is enlarged to increase the moment of inertia, the face area is increased to increase the hit rate, and the face surface is made thinner to make it easier to bend, thereby alleviating the crushing of the ball at the time of impact and inside the ball. A metal material with a hollow structure as a whole is used to suppress energy loss and increase repulsive force. However, in the case of a conventional general driver club head having a face surface having a uniform wall thickness, the deflection is maximized at the center of the face surface, but the deflection sharply decreases at the periphery, so the ball is shot at the center. The ball flies well when it is hit, but there is a problem that the ball does not fly when the ball is shot in the vicinity slightly off the center.

【0003】

Therefore, in order to improve the above-mentioned problem of the driver club head having a face surface having a uniform wall thickness, a method in which the wall thickness of the face surface is changed depending on the part has been proposed (Japanese Patent Laid-Open No. 8-155060). , JP-A-9-168613). When viewed from the inner surface, all of these conventional driver club heads have an impact portion in the central portion and a face surface or a central portion in which a peripheral portion thinner than the impact portion is integrally formed around the impact portion. It is provided with an impact portion, an annular groove thinner than the impact portion around the impact portion, and a face surface or the like on which a peripheral portion having the same wall thickness as the impact portion is integrally formed around the annular groove. However, even with the conventional driver club head in which the wall thickness of the face surface is changed depending on the part, the ball still flies well when the ball is shot in the center, but the ball is shot in the periphery slightly off the center. Sometimes there is a problem that the ball does not fly as expected.

【0004】

[Problems to be Solved by the Invention]

The problem to be solved by the present invention is to provide a driver club head having a predetermined wall thickness distribution on the face surface to suppress a rapid decrease in deflection from the center to the periphery and increase the probability of a so-called nice shot. It is in the place to do it.

【0005】

[Means for solving problems]

The present invention that solves the above-mentioned problems is a metal driver club head having a hollow structure as a whole, and all of them have a disc-shaped impact portion in the center and adjacent to the disc-shaped impact portion when viewed from the inner side surface. An annular recess that is thinner than the disk-shaped impact portion and an peripheral edge portion that is adjacent to the annular recess and has the same wall thickness as the disk-shaped impact portion are integrally formed on the outer periphery of the metal. When the diameter of the disk-shaped impact portion is dmm, the outer diameter of the annular recess is Dmm, the wall thickness of the disk-shaped impact portion is hmm, and the wall thickness of the annular recess is Hmm, d = 10 to 30. , D = 40 ~ 60 and D / d = 2 ~ 4, and h = 2.3 ~ 3.2, H = 1.6 ~ 2.8 and H / h = 0.7 ~ 0.9. It relates to the driver club head.

【0006】

The driver club head according to the present invention is also a metal driver club head having a hollow structure as a whole, and is preferably a driver club head or a sole in which the face surface is welded to a head component integrally cast except for the face surface at the peripheral portion thereof. It is a driver club head in which the sole surface and the face surface are welded to the head parts integrally cast except for the surface and the face surface at their peripheral edges.

【0007】

When viewed from the inner surface, the driver club head according to the present invention has a disc-shaped impact portion in the center, and a circle on the outer periphery adjacent to the disc-shaped impact portion, which is thinner than the disc-shaped impact portion. An annular recess and a face surface adjacent to the annular recess and having a peripheral portion having the same wall thickness as the disc-shaped impact portion integrally formed on the outer periphery thereof are provided. And this face surface, when the diameter of the disc-shaped impact part is dmm, the outer diameter of the annular recess is Dmm, the wall thickness of the disc-shaped impact part is hmm, and the wall thickness of the annular recess is Hmm, d = It has a wall thickness distribution of 10 to 30, D = 40 to 60 and D / d = 2 to 4, h = 2.3 to 3.2, H = 1.6 to 2.8 and H / h = 0.7 to 0.9.

【0008】

The face surface having the above-mentioned wall thickness distribution is formed by punching a flat plate having a predetermined wall thickness into a predetermined shape and then cutting it by lathe processing to form an annular recess having a predetermined width and a predetermined depth, and further, if necessary. It can be manufactured by a simple processing means of bending. The type of metal used as the material for the driver club head according to the present invention, including the face surface, is not particularly limited, but it is preferable to use a titanium alloy or an iron alloy as the material, which is lightweight and has strength, corrosion resistance, and the like. It is more preferable to use a rich titanium alloy.

【0009】

The wood club head according to the present invention has a predetermined wall thickness distribution as described above on the face surface, thereby ensuring practical strength and suppressing a rapid decrease in bending from the center to the periphery thereof. The probability of a so-called nice shot can be increased.

【0010】

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a vertical cross-sectional view illustrating the driver club head according to the present invention, and FIG. 2 is a side view of the same face surface of the driver club head as in FIG. 1 as viewed from the inner surface. In the illustrated driver club head, the face surface 20 made of Ti-4.5Al-3V-2Mo-2Fe is welded to the head part 10 made of Ti-6Al-4V integrally cast except for the face surface 20 at the peripheral portion thereof. It is a thing.

【0011】

When viewed from the inner surface, the face surface 20 has a disc-shaped impact portion 21 in the center and an annular recess 22 adjacent to the disc-shaped impact portion 21 and thinner than the disc-shaped impact portion 21 on the outer circumference thereof. And, adjacent to the annular recess 22, a peripheral edge portion 23 having the same wall thickness as the disk-shaped impact portion 21 is integrally formed on the outer periphery thereof, and the diameter of the disk-shaped impact portion 21 is dmm, and the annular recess 22 When the outer diameter is Dmm, the wall thickness of the disk-shaped impact part is hmm, and the wall thickness of the annular recess 22 is Hmm, d = 15, D = 48, and D / d = 3.2, and h = 2.8, H. It has a wall thickness distribution of = 2.3 and H / h = 0.82.

【0012】

The face surface 20 having such a wall thickness distribution is formed by punching a flat plate made of Ti-4.5Al-3V-2Mo-2Fe having a wall thickness of 2.8 mm into an outer shape as shown in FIG. An annular recess 22 having an inner diameter of 15 mm, an outer diameter of 48 mm, and a depth of 0.5 mm was formed by processing and bent, and the driver club head shown is a separately cast Ti-6Al-4V. The face surface 20 of the head component 10 made of aluminum is welded at the peripheral edge portion 23 thereof.

【0013】

[Example]

The driver club heads of 5 cases shown in Table 1 were prepared. Example 1 in Table 1 is the driver club head described above with respect to FIGS. 1 and 2, and each of the other examples is the same as that of Example 1 unless otherwise specified. Face cracking, flight distance 1 and flight distance 2 were evaluated for the five prepared cases as follows, and comprehensive evaluation was performed, and the results are shown in Table 1. Face cracking: The presence or absence of face cracking was observed with the naked eye when 3000 shots were taken at a head speed of 50 m / s within a diameter of 15 mm centered on the center of the face surface. Flying distance 1: The average value of the flying distance when 50 shots were taken at a head speed of 40 m / s within a range of 15 mm in diameter centered on the center of the face surface was evaluated according to the following criteria. ; 230m or more ; less than 230m 225m or more ; Less than 225m 220m or more ×; less than 220m Flying distance 2: The average value of the flying distance when 50 shots were taken at a head speed of 40 m / s within a range of 15 mm in diameter centered on a point shifted 15 mm from the center of the face surface to the heel side was evaluated based on the above criteria. ..

【0014】

[table 1]

<img file="JP2003019233A_D0001.tif" />【0015】

In Table 1, Comparative Example 1: An example in which there is no annular recess and a face surface having a uniform wall thickness is provided. In this example, when the ball is shot at the center of the face surface, the flight distance is increased, but when the ball is shot at a periphery slightly off the center, the flight distance is not. Comparative example 2: An example in which the annular recess is thin. In this example, the flight distance is stable, but there is a problem in practical strength. Comparative Example 3: An example in which the annular recess is relatively thicker and has a shorter diameter than the disc-shaped impact portion. In this example as well, the flight distance is increased when the ball is shot at the center of the face surface, but the flight distance is not sufficient when the ball is shot at a periphery slightly off the center.

【0016】

[Effect of the invention]

As has already been clarified, in the present invention described above, by providing a predetermined wall thickness distribution on the face surface, practical strength is ensured and a rapid decrease in deflection from the center to the periphery is suppressed. This has the effect of increasing the probability of so-called nice shots.

[Simple explanation of drawings]

[Figure 1]

The vertical sectional view which illustrates the driver club head which concerns on this invention.

[Figure 2]

A side view of the face surface of the same driver club head as in FIG. 1 as viewed from the inner surface.

[Explanation of symbols]

10 ... head parts, 20 ... face surface, 21 ... disc-shaped impact part, 22 ... annular recess, 23 ... peripheral part, d ... disc-shaped impact part diameter, D ... annular Outer diameter of recess, h ... disk-shaped impact part wall thickness, H ... annular recess wall thickness