JP7071456B2 - Golf club head - Google Patents

Description

The present invention relates to a golf club head having a face portion, a sole portion, a crown portion, and a back portion, and the inside is formed in a hollow shape.

In order to improve the flight distance of the golf ball, the wall thickness of the face portion of the club head is reduced, and as described in Patent Document 1, at least a part of the sole portion, the crown portion, etc. is extended in the toe-heel direction. It is known to form existing recesses. In this case, it is presumed that the bending of the face portion at the time of hitting the ball becomes large, and as a result, the spring effect becomes large.

By the way, the Golf Equipment Regulations stipulate that the spring effect of a golf club head must not exceed the upper limit stipulated in the R & A and the Pendulum Test Protocol, which is the USGA test internal rule. The upper limit of the spring effect by the pendulum test is 257 μs, which is the characteristic time (CT value) defined as the contact time when the metal ball, which is a tester, is hit against the club face, including the tolerance of +18 μs. .. In other words, if the tolerance is not included, the CT value must be 239 μs or less.

However, in the golf club head described in Patent Document 1, the CT value is larger than 257 μs. That is, the above upper limit is exceeded.

Japanese Patent Application Laid-Open No. 2003-93554

In order to make the spring effect of the golf club head as described in Patent Document 1 conform to the rules of golf equipment, it is conceivable to increase the wall thickness of the face portion. However, in this case, the center of gravity of the golf club head becomes shallow. Along with this, the sweet area of the face portion becomes narrower.

The present invention has been made to solve the above-mentioned problems, and the wall thickness of the face portion can be set to be small so that the center of gravity can be set to the optimum depth position, and the spring effect conforms to the rules of golf equipment. The purpose is to provide.

In order to achieve the above object, according to one embodiment of the present invention, in a golf club head having a sole portion, a face portion, a crown portion, and a back portion, the inside of which is formed in a hollow shape. ,
At a position close to the back portion of the sole portion, one or more concave grooves from the toe to the heel are formed.
When the golf club head is visually recognized from the sole portion, the recessed groove has a toe side end and a heel side end located between the face portion and the back portion, and the toe side end and the heel side end. A golf club head is provided in which the gap is curved toward the back portion, and the width becomes smaller and the depth becomes smaller toward the toe side and the heel side from the curved top of the concave groove.

According to the present invention, by forming a concave groove in the sole portion whose width and depth change from the curved top portion to the end portion, the thickness of the face portion is avoided to be increased, and the golf equipment rule is adopted. A golf club head showing a compatible spring effect is obtained.

Since it is avoided to increase the wall thickness of the face portion, the center of gravity of the golf club head can be set to an appropriate depth position. Therefore, it is possible to avoid narrowing the sweet area of the face portion.

That is, the spring effect can be adapted to the golf equipment rules while ensuring the sweet area of the face portion.

It is a schematic front view of the golf club head which concerns on embodiment of this invention. It is a bottom view of the golf club head of FIG. 1 viewed from the sole portion side. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. It is a bottom view seen from the sole part side of the golf club head which concerns on another embodiment.

Hereinafter, suitable embodiments of the golf club head according to the present invention will be described, and will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic front view of the golf club head 10 according to the present embodiment. The golf club head 10 has a sole portion 12 facing the ground during play and a crown portion 14 facing the sky. The crown portion 14 is provided with a hosel portion 18 for attaching the shaft 16. In the golf club head 10, the side close to the hosel portion 18 is the heel 20, and the side away from the hosel portion 18 is the toe 22. The golf club head 10 further has a face portion 24 for hitting a golf ball and a back portion 26 facing the face portion 24.

FIG. 2 shows a bottom view when the golf club head 10 is visually recognized from the sole portion 12. The sole portion 12 is formed with a first concave groove 30 and a second concave groove 32 extending from the toe 22 toward the heel 20 at a position close to the back portion 26. The first concave groove 30 and the second concave groove 32 are arranged in parallel so that the first concave groove 30 is located on the face portion 24 side and the second concave groove 32 is located on the back portion 26 side.

The toe-side ends 34a and 34b and the heel-side ends 36a and 36b of the first concave groove 30 and the second concave groove 32 are located between the face portion 24 and the back portion 26. Further, the toe side ends 34a and 34b are located on the side portion of the toe 22. On the other hand, the first concave groove 30 and the second concave groove 32 project from the toe side ends 34a and 34b to the heel side ends 36a and 36b toward the back portion 26 side. That is, both the first concave groove 30 and the second concave groove 32 are curved grooves curved so as to project toward the back portion 26. Hereinafter, the curved points of the first concave groove 30 and the second concave groove 32 are referred to as the first curved top and the second curved top, and the reference numerals thereof are 38a and 38b, respectively.

In this case, the first curved top 38a and the second curved top 38b are biased toward the toe-side ends 34a and 34b from the middle of the sole portion 12. That is, the first concave groove 30 and the second concave groove 32 have a distorted U-shape.

FIG. 3 is a cross-sectional view taken along the line III-III in FIG. As can be understood from FIG. 3, the golf club head 10 is a hollow body having a hollow inside. Such a golf club head 10 can be configured for, for example, a driver, but may also be configured for a fairway wood such as a spoon.

Further, the first concave groove 30 and the second concave groove 32 have a substantially triangular cross section in the direction orthogonal to the extending direction. In the cross section of the first concave groove 30, the angle θ1 formed by the inclined wall on the face portion 24 side and the horizontal line of the sole portion 12 may be set to, for example, about 15 to 60 °. Similarly, the angle θ2 formed by the inclined wall on the back portion 26 side and the horizon of the sole portion 12 can be set to about 15 to 60 °.

The width W1 and the depth D1 of the first concave groove 30 change from the curved top toward the toe side end 34a or the heel side end 36a. Specifically, the width W1 and the depth D1 decrease from the first curved top 38a toward the toe side end 34a and the heel side end 36a. In the first curved top portion 38a, the width W1 is set larger than the depth D1. On the other hand, at the toe side end 34a or the heel side end 36a, either the width W1 or the depth D1 may be larger or the same as the other.

The maximum dimension of the width W1 can be set to, for example, about 5 to 20 mm. Further, the maximum dimension of the depth D1 may be, for example, about 3 to 10 mm. Here, the width W1 and the depth D1 have the maximum dimensions in the vicinity of the groove dividing portion 40.

The above is the same for the cross section of the second concave groove 32. That is, the angle θ3 formed by the inclined wall on the face portion 24 side and the horizontal line of the sole portion 12 and the angle θ4 formed by the inclined wall on the back portion 26 side and the horizontal line of the sole portion 12 are also about 15 to 60 ° as described above. And it is sufficient.

Further, the width W2 and the depth D2 of the second concave groove 32 also become smaller from the second curved top portion 38b toward the toe side end 34b or the heel side end 36b. Then, in the second curved top portion 38b, the width W2 is set larger than the depth D2. Further, the maximum dimensions of each of the width W2 and the depth D2 are typically set to about 5 to 20 mm and about 3 to 10 mm. It goes without saying that the width W2 and the depth D2 have the maximum dimensions in the vicinity of the groove dividing portion 40. At the toe side end 34b or the heel side end 36b, either the width W2 or the depth D2 may be larger or the same as the other.

The distance between the edges of the first concave groove 30 and the second concave groove 32 formed as described above is not particularly limited, but can be set to, for example, 1 mm or less.

A groove dividing portion 40 extending from the first curved top portion 38a to the second curved top portion 38b extends to the sole portion 12. The groove dividing portion 40 has a concave shape that is depressed toward the inside of the golf club head 10. The groove dividing portion 40 has a form in which the first concave groove 30 and the second concave groove 32 are divided with the first curved top portion 38a and the second curved top portion 38b as boundaries. The groove dividing portion 40 may have a concave shape only partially or may have a flat shape.

In the example shown in FIGS. 2 and 3, the length (width dimension) of the groove dividing portion 40 in the toe-heel direction increases toward the back portion 26 side. In this configuration, the width dimension WT can be set to, for example, 5 to 35 mm in the portion where the width of the groove dividing portion 40 is maximum. The groove dividing portion 40 is not particularly limited to that shown in FIG. 2, and for example, a groove dividing portion having a constant width may be provided.

With the above configuration, the golf club head 10 can have the spring effect conforming to the rules of golf equipment without increasing the wall thickness of the face portion 24. Since it is not necessary to increase the wall thickness of the face portion 24, the center of gravity of the golf club head 10 can be set at the optimum depth position. Therefore, it is possible to avoid narrowing the sweet area.

Moreover, since the first concave groove 30 and the second concave groove 32 having the above-mentioned shapes are formed, the spring effect is excellent. Therefore, the flight distance of the golf ball is sufficient.

The present invention is not particularly limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

For example, as shown in FIG. 4, the golf club head 50 may be configured without providing the groove dividing portion 40. In this case, the widths W1 and W2 and the depths D1 and D2 of the first concave groove 30 and the second concave groove 32 are maximized at the first curved top 38a and the second curved top 38b, respectively.

Further, the number of concave grooves is not particularly limited to two, and may be one or three or more.

A golf club head 10 for a driver having a sole portion 12 having a shape as illustrated in FIGS. 2 and 3 was manufactured. The center wall thickness of the face portion 24 was 3.4 mm, and the depth position of the center of gravity was 37.5 mm. As described above, in the golf club head 10, the wall thickness of the face portion 24 is sufficiently small and the center of gravity is sufficiently deep.

The spring effect was evaluated for the golf club head 10. Specifically, the CT value measured by the pendulum test was 235 μs. That is, according to the golf club head 10 configured as described above, the CT value can be suppressed within the rule conformity including the margin of error.

10, 50 ... Golf club head 12 ... Sole part 14 ... Crown part 20 ... Heel 22 ... Toe 24 ... Face part 26 ... Back part 30 ... First concave groove 32 ... Second concave groove 34a, 34b ... Toe side end 36a, 36b ... Heel side end 38a ... First curved top 38b ... Second curved top 40 ... Groove division

Claims (3)

In a golf club head having a sole portion, a face portion, a crown portion, and a back portion and having a hollow inside.
A first concave groove and a second concave groove from the toe to the heel are formed at a position of the sole portion close to the back portion.
When the golf club head is visually recognized from the sole portion, the toe side end and the heel side end of the first concave groove and the second concave groove are located between the face portion and the back portion, and the toe side ends. The area between the side end and the heel side end is curved toward the back portion, and the width of the first concave groove and the second concave groove becomes smaller from the curved top toward the toe side and the heel side. And the depth becomes smaller ,
Further, a golf club head provided with a groove dividing portion extending from the sole portion to divide the first concave groove and the second concave groove into the toe side and the heel side . In the golf club head according to claim 1, the curved top portion is biased from the middle of the sole portion to the toe side end, and the toe side end is located on the toe side side portion of the golf club head. Golf club head. The golf club head according to claim 1 or 2, wherein the concave groove has a substantially triangular cross section in a direction orthogonal to the extending direction.

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