JPH1133145A - Wood golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make design and manufacture of a golf club head easier and to improve the carry performance and directivity of a gold club, by setting the value of the ratio of the height of the center of gravity on the face to the highest top height of the face, and the value of the ratio of the depth of the center of gravity to the longitudinal width of the head at a specific range respectively. SOLUTION: The height from a flat face F when this head is placed on an ordinary address point to the highest top point P is made to be the highest top point height H of the face. The height from the flat face of the foot 7 of the perpendicular 6 drawn from the center of gravity G of the head to the face 1 is made to be the height h of the center of gravity on the face. It is set to be h/H<=0. The horizontal distance between the front end in the face side and the back end in the back face side is made to be the longitudinal head width D, the horizontal distance between the front end in the face side and the center of gravity G of the head is made to be the depth d of the center of gravity, and it is made to be d/D<=0.35. The hit-out angle is made higher to decrease the back-spin amount according to the h/H value to improve the carry performance. The right and left deviation angle is reduced according to the d/D value and the directivity is improved by the gear effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a wood type golf club head.

[0002]

2. Description of the Related Art It has been known that a wood type golf club head has a longer flight distance at a lower center of gravity. For example, Japanese Patent Application Laid-Open Nos. No. 61-209676, those in which a heavy material such as a high specific polymerization metal disclosed in JP-A-6-23072 and the like are arranged at the lower part of the head, those in which the head shape disclosed in JP-A-5-317465 is changed, etc. It was known. Conventionally, it is considered that the greater the depth of the center of gravity (the deeper), the better the directionality and the difficulty in hitting the ball in the lateral direction. For example, JP-A-63-154186,
JP-A-63-267375, JP-A-5-103847, and the like, wherein a heavy material such as a high specific polymerization metal disclosed in JP-A-5-103847,
An enlarged version of the head disclosed in Japanese Patent Application Laid-Open No. 4-12773 is known.

[0003]

However, if both the lowering of the center of gravity and the increase of the depth of the center of gravity are to be realized in order to improve both the flight distance performance and the directionality, the center of gravity is reduced to the lower surface of the head. (Sole surface) and too close to the rear of the head, making it difficult to design the head or making it impossible to design the head. The inventors of the present invention performed measurements in view of such a problem. As is clear from FIG. 3, the conventional wood-type golf club head has a face surface highest peak height of H and a center of gravity on the face surface. When the height is h, the front-to-back width is D, and the depth of the center of gravity is d, 0.68 ≦ h / H ≦ 0.75 and 0.37
The present inventors have found that ≦ d / D ≦ 0.42.

Accordingly, an object of the present invention is to provide a wood type golf club head which solves the above-mentioned problems, can be easily designed and manufactured without difficulty, and can improve both flight distance performance and directionality. I do.

[0005]

In order to achieve the above-mentioned object, a wood-type golf club head according to the present invention is arranged such that the height of the top of the face is H, the height of the center of gravity on the face is h, and When the front and rear width is D and the depth of the center of gravity is d, h / H ≦ 0.65 and d / D ≦ 0.35. Also, 0.45 ≦ h / H, and 0.15 ≦ d
/ D is preferable.

[0006] Further, the height of the face surface highest vertex is H, the height of the center of gravity on the face surface is h, the front-back width of the head is D,
When the depth of the center of gravity is d, h / H ≦ 0.60 and d / D ≦ 0.30. Also, 0.45 ≦ h /
H, and preferably 0.15 ≦ d / D.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings.

1 and 2 show a wood type golf club head according to the present invention, wherein 1 is a face surface, 2 is a sole, 3
Is the crown, 4 is the neck, H is the height of the top of the face, h is the height of the center of gravity on the face, D is the front-to-back width, d
Is the depth of the center of gravity, and G is the center of gravity of the head. P is the highest vertex of the face surface 1 and is at the highest position on the upper edge 5 of the face surface 1.

Here, the maximum height of the face surface is defined as the height from the flat surface F to the face surface in a state where the head is placed on the flat surface F at a normal address position (hereinafter referred to as a normal mounting state). It is defined to refer to the height dimension up to the highest vertex P of 1. Also, the height of the center of gravity on the face is
In a normal mounting state, it is defined as a height from the flat surface F to the foot 7 of the perpendicular 6 lowered from the center of gravity G of the head to the face surface 1. The head front-rear width is defined as a horizontal distance between the front end on the face side and the rear end on the back face side in a normal mounting state. In addition, the depth of the center of gravity is defined as a horizontal distance between the front end on the face side and the center of gravity G of the head in the normal mounting state.

Thus, h / H ≦ 0.65 and d
/D≦0.35. Here, hitherto, it has been known that a wood-type golf club head has a longer flight distance as the center of gravity becomes lower, and the direction becomes better as the depth of the center of gravity becomes larger (deeper), so that the hit ball deviates in the lateral direction. It was considered difficult. However, when the present inventors conducted various experiments on a large number of heads having different center-of-gravity depths d and the like, it was found that d / D
The present inventors have found that the smaller the value is, the better the directionality is (the hit ball is less likely to deviate in the lateral direction). The present inventors have found that the conventional wood type golf club head is in the range of 0.68 ≦ h / H ≦ 0.75 and 0.37 ≦ d / D ≦ 0.42, as is apparent from the graph of FIG. Was.

Therefore, by setting h / H ≦ 0.65 as described above, the launch angle is increased, the backspin amount is reduced, and the flight distance performance is improved. Further, d / D ≦ 0.
By setting to 35, when hitting off the toe side or heel side of the sweet spot and hitting the ball, the swing angle to the left and right of the ball is reduced and the amount of side spin generated by the gear effect is reduced, and the directionality is good You can fly the ball straight. In addition, it is easy to lower the center of gravity in design and manufacture, and h / H can be reduced.
That is, the height of the center of gravity of h / H ≦ 0.65 can be easily realized. Therefore, both the flight distance performance and the directionality can be improved.

In addition, h / H ≦ 0.60 and d / D
It is preferred that ≦ 0.30. By doing so, both the flight distance performance and the directionality can be further improved. Also, from the constraints of head design and manufacturing, 0.45 ≦ h / H, and
0.15 ≦ d / D. Note that if h / H> 0.65,
The flight distance performance is not so different from the conventional wood type golf club head. If d / D> 0.35, the directionality is not so different from that of the conventional wood-type golf club head, and it is difficult or impossible to design h / H ≦ 0.60 in terms of design and manufacture.

The wood type golf club head has a loft angle of 6 to 15 °, a lie angle of 53 to 69 °,
Preferably, the hook angle is between -2 and + 5 °. The loft angle is 11 °, the lie angle is 56 °, and the hook angle is +2.
° is most desirable. Also, if the head volume is 220 ~
Preferably, it is 320 cc. Further, as the material and structure, a metallic hollow head (metal head) is preferable, and a titanium metal head (titanium head) is particularly preferable. It is.

[0014]

Next, wood-type golf club heads according to examples of the present invention and comparative examples were manufactured. The head shape and size are all manufactured by Sumitomo Rubber Industries, Ltd.
NTTi ”(volume 240 cc), and the head weight was 190 g, the standard value of the driver head. The height H of the top of the face was 41 mm, the width D in the front-rear direction of the head was 87 mm, and the loft was 12 °. Further, a conventional head was prepared. Table 1 below shows the values of h / H and d / D of the heads of the above embodiment and comparative example and the head of the conventional example.

[0015]

[Table 1]

FIG. 3 shows the h / H and d / D of each head.
It is a graph which shows the relationship of. As is clear from Table 1 and FIG. 3, Examples 1 to 7 have h / H ≦ 0.65 and d / D
≤ 0.35 and 0.45 ≤ h / H and 0.15 ≤ d
/ D is satisfied. Further, Examples 1, 2, 3, 4,
No. 7 satisfies h / H ≦ 0.60 and d / D ≦ 0.30. Further, Comparative Examples 1 to 4 do not satisfy one or both of h / H ≦ 0.65 and d / D ≦ 0.35. Conventional examples 1 to 4 are:
Both h / H ≦ 0.65 and d / D ≦ 0.35 are not satisfied.

The first embodiment is made of a single titanium alloy material, and the thickness of the crown portion and the side portions is reduced in order to reduce the center of gravity.
The thickness of the upper part of the face was set to 1.0 mm, the thickness of the upper part of the face was set to 2.5 mm, and the thickness of the lower part of the face was set to 3.3 mm. The sole had a thickness distribution of 1.7 mm at the front and 1.3 mm at the rear. In Example 2, the head body was made of duralumin, and the sole was fitted with 20 g of brass. The thickness of each part is 2.0 mm for the crown, side and sole, and the face
5.5 mm.

In Examples 3 and 4, the head body was made of duralumin, and 20 g of brass was fitted to the face. Brass fitting positions were different. Example 3
In the fourth embodiment, brass was fitted to the center of the face and near the midpoint of the lower end of the face. In Example 4, brass was fitted to the lower end of the face. Example 5 was designed by the same thickness adjustment as in Example 1, and the weight of the crown portion was redistributed to the rear side of the sole. Examples 6 and 7
Was made such that the curvature of the crown portion was reduced so that the crown portion did not protrude, and then the weight was distributed by adjusting the thickness.

Comparative Example 1 was made of a single titanium alloy material, the thickness of the crown and side portions was 1.2 mm, the thickness of the sole portion was 1.5 mm, and the thickness of the face was 2.7 mm (excluding ribs). In Comparative Example 2, the curvature of the crown portion was reduced so that the crown portion did not protrude. Comparative Example 3 was manufactured by using duralumin as the material of the head body and fitting 20 g of brass into the center of the face. Comparative Example 4 was made of a single material of a titanium alloy, and the thickness of the crown portion and the side portion was reduced.
The center of gravity was slightly lower than that of Comparative Example 1 with 1.1 mm, 1.5 mm at the sole and 3.0 mm (excluding ribs) at the face.

Next, the same shaft (manufactured by Sumitomo Rubber Industries, Ltd., trade name "Ferject WT50V510") was attached to the heads of Examples 1 to 7 and Comparative Examples 1 to 4, and a hitting test was performed with a swing robot. Was done. The golf ball (manufactured by Sumitomo Rubber Industries, Ltd. under the trade name "D") was used with a head speed of 40 m / s at the time of impact and a face center, 10 mm above the face center, and 20 mm on the toe side of the face center.
DH TOUR SPECIAL ROYAL BLUE ”) and measured carry, back spin, launch angle, swing angle, side spin, etc. The results are shown in Tables 2, 3 and 4 below.

[0021]

[Table 2]

[0022]

[Table 3]

[0023]

[Table 4]

From the above Table 2, it can be seen that the height of the center of gravity is low in Example 1,
It can be seen that the flight distances of 2, 3, 4, 6, and 7 (particularly, Examples 2, 4, and 6) are longer than those of Comparative Examples 1, 3, and 4. This is because the position of the ball with respect to the center of gravity was higher than that of Comparative Examples 1, 3, and 4 due to the lower position of the center of gravity, the launch angle was increased, and the backspin was reduced in the vertical direction by a gear effect. Can be estimated. This is shown in Table 3.
In this case, it can be said that the hit angle at a position 10 mm above the face center is higher than the hit angle at the face center, the backspin is reduced, and as a result, the carry is longer. In Comparative Example 2,
In Table 2 the carry was 190.7m and in Table 3 the carry was
Although slightly large at 195.4 m, as is clear from Table 4, the difference in the deflection angle in the left-right direction is large at 4.2 °, and the directionality is poor.

In Table 4, the difference between the swing angle between the case where the ball is hit at the center and the case where the ball is hit at a position 20 mm on the toe side of the center is as shown in Examples 1, 2, 3, 4, 6, and 7. Smaller than Comparative Examples 1 and 2. Further, the side spins of Examples 1, 2, 3, 4, 5, 6, and 7 are smaller than those of Comparative Examples 1 and 2. For this reason, when the depth of the center of gravity is smaller (shallower), the swing angle and side spin amount of the ball in the left-right direction at the time of impact are smaller.
You can say ─.

In Comparative Examples 3 and 4, the difference between the deflection angle and the difference between the side spins is small, but as is clear from Tables 2 and 3, the carry is small, so that the flight distance performance is poor. is there. In Example 5, h / H ≦ 0.65 and d
/D≦0.35, but the carry is larger than in Comparative Examples 3 and 4, and the deflection angle is smaller than in Comparative Examples 1 and 2. It is good.

[0027]

Since the present invention is configured as described above,
The following effects are obtained. According to the wood type golf club head of the first aspect, both the flight distance performance and the directionality can be improved, and the degree of freedom in design increases. According to the wood type golf club head of the second aspect, both the flight distance performance and the directionality can be further improved, and the degree of freedom in design is increased. According to the wood type golf club head of the third aspect, design and manufacture can be easily and easily performed.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of a wood type golf club head according to the present invention.

FIG. 2 is a plan view.

FIG. 3 is a graph.

[Explanation of symbols]

 D Head front-back width d Depth of center of gravity H Height of the vertex of the face surface h Height of the center of gravity on the face surface

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor K. Nishio 129-1 Minori, Kakogawa-cho, Kakogawa-shi 1-C, Sangaden Minori 1-C (72) Inventor, Kazuo Asano 3-2, 6-103

Claims (3)

[Claims] When the height of the vertex of the face surface is H, the height of the center of gravity on the face surface is h, the front-back width of the head is D, and the depth of the center of gravity is d, h / H ≦ 0.65, d
/D≦0.35, a wood-type golf club head. 2. When the height of the vertex of the face surface is H, the height of the center of gravity on the face surface is h, the front-back width is D, and the depth of the center of gravity is d, h / H ≦ 0.60, d
/D≦0.30, a wood-type golf club head. 3. The condition of 0.45 ≦ h / H and 0.15 ≦ d /
The wood-type golf club head according to claim 1, wherein the golf club head is D.