KR100906529B1 - Golf club head - Google Patents

Abstract

Provided is a golf club head that keeps the distance difference with respect to the flying distance when hitting the sweet spot even when the RBI is missed on the crown side and the sole side.

The thickness part 20 extended in the substantially X direction is provided in the center of the back surface of the face 11. The thickness portion 20 is divided into four divisions of the back surface of the face 11 to form the crown peripheral portion Mc, the sole peripheral portion Ms, the toe peripheral portion Mt, and the heel peripheral portion Mh. The plate | board thickness of these division surfaces becomes two or more types which become smaller than the plate | board thickness of a crown peripheral part and a sole peripheral part than a toe peripheral part and a heel peripheral part.

Description

GOLF CLUB HEAD {GOLF CLUB HEAD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club head, and more particularly, to a golf club head having a small difference in flying distance even if there is a deviation in the RBI when the golf ball is hit.

In general, golf clubs called drivers tend to improve the flying distance characteristics by making the thickness of the face, which is the hitting surface of the golf ball, as thin as possible by the recent request for light weight and large size. According to this, the curvature amount of the sweet spot which is the intersection which connects the center point of a golf club head (henceforth a "head") and a face surface vertically can become large, and a flying distance can be extended.

As the head, there is a type in which the plate thickness of the face is constant, but the head of this type has a large distance when hitting the sweet spot, but the distance when hitting at a position shifted from the sweet spot is considerably shortened, and every hit. The deviation of the flying distance is large. In other words, a head having a face formed with a constant plate thickness has a narrow sweet area.

By the way, as for the golf club, in order to increase the repulsion coefficient, when the thickness of the face plate is thinned, it is necessary to maintain a constant strength. Therefore, the thickness part may be provided in the face back surface (for example, refer patent document 1, patent document 2).

The head described in Patent Document 1 is configured to have a thickness portion extending substantially in the X direction on the back face of the face, and the head described in Patent Document 2 extends in the longitudinal direction, that is, the crown side and the sole side on the face back face. It is a structure provided with the rib-shaped thickness part.

According to such a head, it is possible to reduce the thickness of the face and achieve weight reduction, while maintaining a constant strength. Moreover, according to the head of patent document 2, the advantage that the sweet area can be extended to a toe and a heel side can be added.

[Patent Document 1: Japanese Patent Application Laid-Open No. 9-154985]

[Patent Document 2: Japanese Unexamined Patent Publication No. 2006-175135]

However, in the head described in Patent Literature 1, the reduction in the flying distance when the spot is shifted from the sweet spot is not taken into account, and the flying distance is considerably shortened even when the spot is shifted. Moreover, in the head of patent document 2, there exists a disadvantage that the flying distance when a RBI is shifted to a crown side and a sole side with respect to a sweet spot becomes considerably short compared with the flying distance when it hits a sweet spot.

In a typical golfer, the direction of escaping the sweet spot at the time of impact is not limited to the toe side and the heel side, and may shift to the crown side and the sole side, and the RBI height may be different for each shot. In particular, in the swing from the back swing to the impact, the head position is often shifted up and down with respect to the golf ball unless the weight movement is smoothly performed. Therefore, if the sweet area is expanded to the soil side and the heel side alone, the characteristics of the head cannot be sufficiently exhibited, and if the distance difference can be kept small even when the spot is shifted to the crown side and the sole side with respect to the sweet spot, For golfers, it can be said to be a golf club that provides a stable flying distance.

MEANS TO SOLVE THE PROBLEM When the thickness part is provided in the back surface of a face, the present inventors examined various causes of the fall of the flying distance in a crown side and the sole side, and, as a result, the relationship with the plate | board thickness of the individual division surface formed in the back surface by a thickness part It has been found that there is a factor causing variation in flying distance.

[Purpose of invention]

Herein, an object of the present invention is a golf club head suitable for a golf club that has a small distance difference with respect to the flying distance when hitting the sweet spot even when the RBI is shifted to the crown side and the sole side based on the above knowledge, and is easy to obtain a stable flying distance. Is to provide.

In order to achieve the above object, the present invention is a golf club head in which the face which is the hitting surface of the golf ball is made of metal,

In the center of the back surface of the face, a thickness portion extending in the substantially X direction is provided, and the face back surface is divided into four sections, and the plate thickness of the divided surface is two or more types.

The golf club head is preferably such that the maximum plate thickness difference in the entire face including the thickness portion is 1 ~ 5mm.

Moreover, what is necessary is just to set so that the value which divided the maximum thickness difference in the whole face including the said thickness part by the width of the thickness part becomes like this.

In addition, it is possible to take the configuration that the area of the thickness portion is preferably set to 8.0 to 18% of the total area of the face.

In addition, when the area of the divided surface is the crown peripheral area (Mca), the sole peripheral area (Msa), the soil peripheral area (Mta), the heel peripheral area (Mha),

You may comprise so that (Mca + Msa) / (Mca + Msa + Mta + Mha) may be 5.4 to 19%.

According to the present invention, by providing a thickness portion extending substantially in the X direction, even if the RBI is shifted around the toe and the heel, the flying distance difference can be kept small compared to the flying distance when hitting the sweet spot. In addition, even when the RBI is shifted around the crown and around the sole, the plate thickness in this area can be made easier by bending thinner than the plate thickness at the dividing surface around the toe and around the heel. It becomes possible to suppress the fall of the flying distance in the case of hitting small.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described, referring drawings.

The front view which looked at the head in this embodiment from the face side is shown in FIG. 1, and the schematic perspective view which looked at the face from the back side is shown in FIG. In this figure, the head 10 includes a face 11, a toe 12, a heel 13 positioned on the left and right sides of the face 11, a crown 14, and a sole 15 located above and below. It is comprised by the hollow metal molded article provided with this. A hosel 17 is installed at an intersection of the crown 14 and the heel 13 to connect a shaft (not shown), and a shaft is inserted into the hosel 17 to fix the shaft to the head 10. It is. Incidentally, although the face 11 is shown in a horizontal plate shape in the example of illustration, this is for convenience of simplification of the drawing and actually has a curved shape called a bulge.

As shown in Figs. 2 to 4, the face 11 is formed on the back side thereof with a thickness portion 20, which has a substantially X-shaped rib shape, integrally with the face 11. This thickness part 20 is formed in the state which the cross | intersection area which comprises X is located in the center part of the face 11. As shown in FIG. The thickness part 20 is formed in the substantially dome shape or the water droplet shape so that a center part may become the highest thickness in the cross-sectional shape in a short direction (A-A line | wire in FIG. 2) (refer FIG. 3). In addition, in the cross-sectional shape in a long direction (BB line | wire in FIG. 2), the thickness part 20 is formed so that thickness may gradually decrease toward both sides of a long direction from a center part so that both left and right sides may become comparatively low. . In the example of illustration, although the thickness part 20 is shown in the state which crossed the linear rib, this planar shape does not limit this invention, It forms as the thickness part which crosses a curved rib and looks X shape in plan view. It includes case.

The face 11 is divided into four rear surfaces by providing a thickness portion 20, whereby the divided surfaces of the crown periphery Mc, the sole periphery Ms, the toe periphery Mt, and the heel periphery Mh are formed. Formed.

Next, in order to confirm the effect of this invention, a specific example is demonstrated using the test head and a comparison head which concern on this invention.

(Example 1)

Four titanium heads were produced by a 4 pcs forging method with a head volume of 255 cc and a head weight of 199 g. The difference of these four heads is that the configuration of the faces is only different and is common to the other parts.

Test head 1:

The center plate thickness (center of the cross section of the thickness section) is 4.80 mm, and the plate thickness of the crown periphery (Mc) and the sole periphery (Ms) is 2.2 mm, respectively, and the plate thickness of the toe periphery (Mt) and the heel periphery (Mh). Was 2.5 mm. In addition, the plate thickness of the long direction both sides in the thickness part was set to the type from which the thickness is gradually reduced from the center part so that it may become 3 mm. The total area under the face is 48.4 ㎠, and the ratio of the area of each dividing surface is 4.6% of the crown perimeter (Mca), 7.4% of the periphery of the sole (Msa), 45.4% of the periphery of the soil (Mta), and the area around the heel. 42.6%.

Comparison Head 1:

The plate thickness of the face was made into 2.6 mm of uniform thickness.

Comparison Head 2:

In the center of the face, the thickness portions extending in the crown and sole directions were provided in the form of I in plan view, the center plate thickness was 4.80 mm, and the other plate thickness was 2.50 mm.

Comparison Head 3:

In the plan view, an X-shaped thickness portion was provided, and the center plate thickness was 4.80 mm, while the other plate thickness was 2.50 mm in the same manner as in Comparative Head 2.

The shaft was connected to the said test head 1 and the comparison heads 1-3, and the flying distance test was done by the robot for theta. In this test, the head speed was 40 m / s, and the average value hit by 5 pitches was obtained. As shown in FIG. 1, the RBI of the golf ball is the center P1 of the face, the points P2 and P3 approximately 20 mm apart in the horizontal direction about the toe and the heel from the center, respectively, from the center to the crown and around the sole. It was set as the points P4 and P5 which respectively separated 12 mm in the perpendicular direction. Here, the center P1 of the face is an intersection of the center of the imaginary line connecting the boundary between the face, crown and sole in the vertical direction and the center of the imaginary line connecting the boundary between the face, toe, and heel in the horizontal direction.

The result of the flying distance by each point strike of Example 1 is shown below.

As shown in the results of Table 1, the test head 1 was a head having a small distance difference of 8 m from the center of the crown and the sole periphery where the flying distance was relatively low. This is because the plate thickness of the crown periphery and the sole periphery is made thinner than the plate thickness of the periphery of the toe and the heel periphery. Therefore, it can be said that the test head 1 is a wide type of sweet area at the face. In addition, the test head 1 obtained the measured value which does not exceed the regulation value 0.83 of the golf rule regarding the rebound coefficient scheduled from 2008.

Although the comparison head 1 has a large flying distance from the center, the difference in the flying distance from the RBI other than the center is large, and the sweet area becomes a narrow head. In addition, the comparison head 1 had a repulsion coefficient of 0.85, resulting in an out of regulation.

The comparison head 2 has a small distance difference at the toe periphery and a heel periphery with respect to the center, but a distance difference at the crown periphery and the sole periphery becomes large, and the sweet area in the vertical direction to the center is still narrow.

Similarly to the comparison head 2, the comparison head 3 had a narrow sweet area in the vertical direction. This is thought to be due to the plate thickness of the crown periphery and the sole periphery being the same as the toe periphery and the heel periphery.

From the above, it is understood that a head having a wide sweet area can be obtained by providing two types of plate thicknesses of the divided surfaces divided by the thickness portion while providing an X-shaped thickness portion on the face back surface.

(Example 2)

In the same manner as in Example 1, three heads having a head volume of 255 cc and a head weight of 199 g were produced by the 4pcs forging method. The thickness part in each head and the plate | board thickness of each division surface were changed as shown in Table 2 with respect to the said test head 1.

The shaft was connected to the test heads 2-4, and the flying distance test by the robot was performed like Example 1. The results are shown in Table 3.

As can be seen from Table 3, when the plate thickness difference in the face is 1 mm, the maximum difference in the flying distance is 8 m, and even when the plate thickness difference is 5 mm, the head structure having a wide sweet area similarly enters the distance difference of 8 m. It was confirmed. Moreover, although the maximum difference enters 12m also in the test head 4, it turns out that it is more effective than the case where the maximum difference of plate | board thickness is 1-5 mm from the said result.

(Example 3)

In the same manner as in Example 1, four identical heads were manufactured by the 4 pcs forging method. In this example, as shown in the following test heads 5-8, the area of the thickness part on the back surface of the face was changed. In addition, the test head 6 shown in this Example corresponds to the test head 1 described above.

The distance test by the robot was performed like Example 1 by connecting the shaft to the said test head 5-8. The flying distance at each point of the face is shown in Table 5.

As shown in Table 5 above, the maximum difference also enters 12 m in the test head 8, but it can be seen that it is more effective when the ratio of the thickness area is 18.0% or less.

(Example 4)

The head was produced similarly to Example 1. In this embodiment, as shown in Table 6, the area ratio of each divided surface is changed. Table 6 also shows the test head 1 described above.

The shaft was connected to the test head, and a flying distance test by a robot was performed in the same manner as in the above embodiment. The results are shown in Table 7. In addition, the test head 10 corresponds to the test head 1 mentioned above.

In Table 7, test head 12 is within the maximum allowable difference, although the ratio of the sole periphery to the crown periphery is relatively small. However, when the ratio of the sole periphery and the crown periphery ratio is 5.4% or more, it is evident that the distance between the sole and the crown periphery does not drop significantly.

(Example 5)

The head was produced similarly to Example 1.

In this example, as shown in Table 8, test heads 13 to 16 in which the maximum thickness difference t was changed from the width W of the thickness portion (see FIG. 1) to the limit value R (%) were fabricated. The distances were tested by robots by connecting the shafts to these heads. The results are shown in Table 9.

As can be seen from Table 9, even if the value R% is 2.8%, the distance difference enters 12m. Moreover, when the said value R% is 7.6-62.5%, the difference with respect to the flying distance in a center position becomes especially small. Therefore, when R% is 7.6% or more, it becomes a more preferable head with a small distance difference.

(Example 6)

In this example, a test head 17 was produced in the same manner as in Example 1, and the face plate thickness was as shown in Table 10.

The test head 17 was connected to a shaft and a distance test by a robot was performed. The results are shown in Table 11.

As can be seen from Table 11, it can be seen that a head having a small deviation in flying distance can be obtained even when the plate thickness is made of three types of plate thicknesses, which are smaller than the heel and smaller in the crown and sole than the toe.

Although the best structure, method, etc. for implementing this invention are disclosed in the above description, this invention is not limited to this.

That is, although the present invention has been particularly shown and described with respect to specific embodiments, those skilled in the art can add various modifications to the embodiments described above without departing from the spirit and scope of the invention. It is.

For example, in the said embodiment, although it showed about the wood type called a driver, it is applicable to what is called a fairway wood and the head of a utility golf club. Moreover, as long as the distance difference can be made small, it does not prevent the application to an iron golf club.

In addition, the thickness part 20 is not limited to a face integrated structure, The thickness part of a separate body may be formed and this may be joined to the face back surface.

In addition, the thickness portion 20 is not limited to gradually decreasing the thickness so that both sides in the long direction are relatively lower with respect to the face center portion, and may be a constant thickness, and the width is increased along both sides in the long direction. It may be formed to be narrow. In short, the present invention is sufficient if a constitution capable of extending the sweet area to the crown and the heel side by providing a thick portion made of approximately X-shaped ribs in plan view at the center of the face.

1 is a front view of a golf club head viewed from the face side;

2 is a schematic perspective view of the face viewed from the back side;

3 is a sectional view seen from the arrow A-A of FIG.

4 is a sectional view seen from the arrow B-B in FIG.

<Description of the symbols for the main parts of the drawings>

10: golf club head

11: face

12: Sat

13: hill

14: crown

15: brush

20: thickness part

Mc: around the crown

Ms: around the sole

Mt: around the toe

Mh: around the hill

Claims (5)

In the golf club head where the face which becomes the hitting surface of a golf ball is metal, A golf club head comprising: a thickness section extending in the X direction at a central portion of the rear face of the face and divided into four divided face faces, and a plate thickness of the divided face being two or more and four or less. The method according to claim 1, A maximum club thickness difference in the whole face including the said thickness part is 1-5 mm, The golf club head characterized by the above-mentioned. The method according to claim 1 or 2, The golf club head, characterized in that the value obtained by dividing the maximum thickness difference in the entire face including the thickness part by the width of the thickness part is 7.6 to 62.5%. The method according to claim 1 or 2, Golf club head, characterized in that 8.0 ~ 18% of the total area if the area of the thickness portion is the face. The method according to claim 1 or 2, When the area of the divided surface is the crown peripheral area (Mca), the sole peripheral area (Msa), the soil peripheral area (Mta), the heel peripheral area (Mha), Golf club head, characterized in that (Mca + Msa) / (Mca + Msa + Mta + Mha) is 5.4 to 19%.

Images