JP6662758B2 - Golf club head - Google Patents

Description

  The present invention relates to a golf club, and more particularly, to a golf club head having a hollow structure.

  Conventionally, it has been known that the face portion of a metal head having a hollow structure is easily bent so that the ball is not crushed at the time of hitting a ball, thereby reducing energy loss due to deformation of the ball and improving the flight distance. Have been. Therefore, in order to improve the flight distance, for example, as disclosed in Patent Document 1, a concave groove is formed around the face side of the head body so that the face portion is easily bent when hitting a ball. It is possible. That is, when a concave groove is formed on the face side of the head main body over the entire circumference (a crown portion and a sole portion other than the side portion may be formed), the periphery of the face portion is easily displaced in the front-rear direction (face-back direction). Therefore, the center of the face portion can be largely bent at the time of hitting a ball, which can be expected to improve the flight distance.

  This is because the vicinity of the face center (near the geometric center of the face portion or the vicinity of the sweet spot), which is the position farthest from the supporting portion (joining portion) around the face portion, is the most deflected. The feel is good and the flight distance can be improved. In particular, by forming a concave groove in the head main body as in Patent Literature 1, the entire face portion is easily bent, so that the effect can be enhanced.

JP-A-2015-167742

  By the way, in the head body as described above, the hit feeling differs and the flight distance changes between the case where the ball is hit near the face center and the case where the ball is hit near the center. That is, since the face center is most easily bent, the contact time with the ball greatly changes between the case where the ball is hit at (or near) the face center and the case where the ball is hit away from the center. The difference in time gives the golfer the impression that the hit feeling is different, and the actual flight distance also changes. In particular, as the distance from the face center increases, the difference in hit feeling becomes more remarkable. Also, as disclosed in Patent Document 1 described above, in a configuration in which a groove is formed around the head main body, the vicinity of the center largely bends at the time of hitting the ball, but both sides do not bend much, so that the difference in hit feeling is small. growing.

  The above contact time is standardized by a CT value (characteristic time value) based on a pendulum test. In a normal hollow head, the CT value of the face center portion is the highest, and as the distance from the center increases, the CT value increases. Is greatly reduced, and as described above, even if a concave groove is formed in the periphery, the overall CT value improves, but the CT value shifts from the face center to the periphery and approaches the support portion, and the CT value increases. Is declining.

  The present invention has been made in view of the above problem, and provides a golf club head in which a difference in hit feeling between a case where a ball is hit at a face center portion and a case where a ball is hit around the center is reduced. With the goal.

In order to achieve the above object, a golf club head according to the present invention includes a metal head body having a hollow structure including a face portion, a crown portion, and a sole portion. On the face portion side, a toe-side groove formed from the crown portion to the toe-side side portion and a heel-side groove formed from the crown portion to the heel-side side portion are formed, and the toe-side groove and the heel-side groove are It is not formed in the central region of the crown portion and has a separate structure separated in the toe-heel direction, and the heel side groove extends to the upper end side of the hosel portion formed in the crown portion on the crown portion side. is formed so as to rise, this the the side portion side, which is formed so as to rise to an intermediate portion of the hosel portion are divided by the hosel The features.

  According to the above-described head structure, the flexibility of the face portion can be improved by the toe side groove formed from the crown portion to the side and the heel side groove formed from the crown portion to the heel side. In this case, since the toe-side groove and the heel-side groove are not formed in the central region of the crown portion and have a separate structure separated in the toe-heel direction, the face portion is formed in the center region (face center portion). ) Is suppressed, and the grooves on the toe side and the heel side can improve the flexibility. That is, when viewed in the entire face portion, the flexure of the easily-flexible center region farthest from the support portion of the face portion is suppressed, and the toe side and the heel side, which are hard to flex near the support portion, are easily flexed by the respective grooves. Accordingly, the entire face portion can be made uniform in flexibility, and it is possible to reduce a difference in hit feeling between a case where the ball is hit at the face center portion and a case where the ball is hit around the center portion. .

  ADVANTAGE OF THE INVENTION According to this invention, the golf club head which reduced the difference in the hit feeling between the case where the ball was hit in the face center portion and the case where the ball was hit in the vicinity is obtained.

FIG. 1 is a front view showing one embodiment of a golf club head according to the present invention. FIG. 2 is a plan view of the golf club head shown in FIG. 1. The figure which looked at the golf club head shown in FIG. 1 from the toe side. The figure which looked at the golf club head shown in FIG. 1 from the heel side. FIG. 3 is a sectional view taken along the line AA in FIG. 2. Sectional drawing along the BB line of FIG.

  Hereinafter, an embodiment of a golf club head according to the present invention will be described with reference to FIGS.

  The head body 3 of the golf club head 1 according to the present embodiment includes a face portion 5 having a hitting surface (face surface) 5 a, a crown portion 6 extending rearward from an upper edge of the face portion 5, and a face portion 5. It has a hollow structure including a sole portion 7 extending rearward from a lower edge, and a side portion 8 connecting edges of the crown portion 6 and the sole portion 7. The side portion 8 includes a back portion 8a facing the face portion 5, a toe portion 8b and a heel portion 8c from the face portion 5 via the back portion 8a.

  The head body 3 is configured by joining a plurality of metal outer shell members divided at various positions by welding, bonding, or the like. Each outer shell member is made of, for example, a titanium alloy, an aluminum-based material. An alloy, a magnesium alloy or the like can be integrally formed by casting and press molding, and the head main body 3 is formed by welding, bonding, brazing, screwing, etc. the respective edge regions. In this case, each member (outer shell member) constituting the head main body 3 has a plurality of members, such as integrating the side portion 8 with the sole portion 7 or the crown portion 6, or a partial portion of each member. The components may be integrally formed by casting or the like, and may be joined by welding, bonding, or the like. Further, the side portion 8 may have a configuration in which the side portion 8 is integrated into a flat surface without forming a ridge line between the crown portion and the sole portion.

  The face portion 5 is formed by, for example, press working, CNC working, forging, or the like of titanium, a titanium alloy, or the like, and is formed by welding, laser welding, brazing, bonding, or the like. And an opening formed on the front side of the side portion. In this case, the face portion 5 may be formed in a plate shape and joined to another outer shell member, or may be formed in a cup shape and joined to the crown portion, the side portion, and the sole portion. A part may be constituted.

  Further, a hosel portion 10 for fixing a tip of a shaft (not shown) is integrally formed in the head main body 3. The hosel portion 10 protrudes upward from the crown portion 6, and the distal end portion of the shaft is fitted and fixed in the opening hole 10a.

  The hitting surface (face surface) 5a of the face portion 5 is a portion where a hitting ball is hit, and is a region surrounded by a top edge 5A, a sole edge 5B, and a side edge 5C which define the upper and lower sides. That is, as for the face surface 5a, the ridge line between the crown portion 6, the sole portion 7 and the side portion 8 (the top edge 5A, the sole edge 5B, And a boundary line by the side edge 5C). When the ridgeline is curved, the boundary is defined by a curved top. In this case, the boundary line portion may be colored by color or the like so that the face surface 5a becomes clear. A score line may be separately formed on the face surface 5a.

  The face portion 5 is formed with a roll that curves in the crown / sole direction (vertical direction) and a bulge that curves in the toe-heel direction (right and left direction). A center position (face center) C of the face portion 5 exists in the top region of the portion. The face center C is a geometric center position of the face surface 5a defined as described above. That is, in FIG. 1, when the face surface 5a is viewed from the front in a state where the golf club is held at a specified lie angle with respect to the reference horizontal plane P, a plane perpendicular to the reference horizontal plane P at the center of the maximum width of the face surface 5a. When V is subtracted, the center position of the face height on the vertical plane becomes the face center C.

  On the face side of the crown portion 6, a toe side groove 12 formed from the crown portion to the toe side and a heel side groove 14 formed from the crown to the heel side are formed. These grooves are for improving the flexibility of the face portion 5 as in the structure disclosed in Patent Document 1 described above, and are provided in the central region of the crown portion 6 (the central region including the vertical surface V). It is not formed and has a separate structure separated in the toe-heel direction. For this reason, in the face portion 5, although the flexibility on the toe side and the heel side is improved, the bending is suppressed in the central region.

  Further, both sides of each of the grooves 12 and 14 do not reach the sole portion 7 and are formed to be terminated at the intermediate portion. For this reason, the face portion 5 has improved flexibility on the toe side and heel side and on the crown side, and the sole side is in a state where the bending is suppressed.

  According to the above-described head structure, the flexibility of the face portion 5 can be improved by the toe side groove 12 formed from the crown portion to the side and the heel side groove 14 formed from the crown portion to the heel side. In addition, since each groove has a separate structure separated in the toe-heel direction, the face portion 5 is prevented from bending in the area of the face center C, and the crown portion has a toe side and a heel side. Thus, the flexibility can be improved by the respective grooves. Also, in the conventional hollow structure head, the sound generated at the time of hitting also differs depending on the hitting position because the amount of deformation differs between when hitting at the face center part and when hitting at a part shifted from the face center, According to the above-described configuration, the toe side and the heel side of the face that is difficult to deform are easily deformed. That is, when viewed over the entire face portion, uniformity of flexibility can be achieved, and the difference in hit feeling between a case where a ball is hit at the face center C portion and a case where a ball is hit around the portion is reduced. In addition, since the resilience is also uniformed, the flight distance can be stabilized even if the ball is missed, and the hitting sound can be leveled to a close sound.

  Further, since the toe-side groove 12 and the heel-side groove 14 are not formed up to the portion reaching the sole portion 7, the state in which the bending on the sole side is suppressed. In this case, if the ball is hit on the sole side of the face portion 5, if the flexibility is good, the roll described above tends to loft the hit point of the face portion, making it difficult for the hit ball to rise and the flight distance to be not extended. . That is, by suppressing the flexibility of the sole side by not forming a groove on the sole side, it becomes difficult for the loft to stand when the ball is hit on the sole side, and as a result, the hit distance is increased and the flight distance is reduced (reduced carry). , And a stable flight distance can be achieved over the entire face portion.

  Further, the toe-side groove 12 and the heel-side groove 14 are preferably formed continuously over a region from the crown portion to the side, but may be divided at an intermediate portion thereof. In the present embodiment, the heel side groove 14 is divided at a portion of the hosel portion 10 formed in the crown portion 6, and on the crown portion side, as shown in FIGS. 2 and 3, up to the upper end side of the hosel portion 10. The side portion is formed so as to rise to an intermediate portion of the hosel portion 10. For this reason, the face portion of the present embodiment is in a state in which the flexibility on the heel side is more suppressed than on the toe side.

  According to such a configuration of the heel side groove 14, the golfer does not feel uncomfortable when addressing, and the appearance does not deteriorate. Of course, the heel-side groove 14 may be formed continuously so as to bypass the hosel portion 10.

  In the crown 6, the positions where the toe-side grooves 12 and the heel-side grooves 14 are formed are set as follows because if the distance between the two grooves is too small, the flexibility near the face center becomes too good. Is preferred. That is, a general amateur golfer attempts to hit the ball at the face center C, but may vary on the toe side and the heel side. This variation is generally about 15 mm to 20 mm when measured by many golfers, and sometimes 25 mm to 30 mm in some cases.

  For this reason, in consideration of the vertical plane V passing through the face center C, the toe-side groove 12 is formed from the position X1 15 mm away from the vertical plane V on the toe side, and the heel-side groove 14 is formed in the vertical plane V. On the other hand, it is preferable to be formed from a position X2 15 mm away from the heel side. In addition, it is preferable that the side ends at a position substantially passing through a face center C and substantially reaching a horizontal plane P1 parallel to the reference horizontal plane P so that the golf ball easily bends at the time of hitting and a loft does not stand.

Here, in the same golf club head, under the same conditions, when the toe side groove 12 and the heel side groove 14 shown in FIGS. 1 to 4 are formed and when such a groove is not formed. The distribution results of CT values measured based on the pendulum test (CT value distribution for each specific position of the face portion) are shown below.
The CT value distribution shown in the following table is based on the CT value measured at the face center C (assumed to be 100%). The heel (H) direction shows the distribution of CT values in 5 mm units.

  As is clear from the comparison of the distribution tables described above, when grooves are formed, at the positions of 15 mm and 20 mm on the toe side, at the positions of 5 mm and 10 mm on the crown side, and at the positions of 15 mm and 20 mm on the heel side. In addition, at the positions of 5 mm and 10 mm on the crown side, the CT value can be improved (the degree of reduction of the CT value is small) as compared with the case where neither groove is formed. It is possible to achieve uniform hit feeling, stable flight distance, and the like.

  The toe-side groove 12 and the heel-side groove 14 formed as described above are formed so as to be easily bent on the crown side from the face center C of the face portion 5 and on the toe side and the heel side. However, by changing the groove width, the thickness of the groove portion, the shape of the groove, and the like, the flexibility can be appropriately adjusted.

  For example, as shown in FIGS. 5 and 6, the groove width W1 of the toe side groove 12 and the groove width W2 of the heel side groove 14 are formed to be wider than the thickness T of the surrounding crown portion 6. Thus, the flexibility on the toe side and the heel side can be effectively improved. As for the shape (cross-sectional shape) of the groove, the flexibility can be improved by inclining the side wall with respect to the bottom wall forming the groove (for example, the V-shaped groove rather than the concave groove). Further, it is possible to improve the flexibility even if the depth is formed to be shallow when the depth is formed. Further, the bottom wall and the side walls are more flexible when the thickness is thinner than the thickness T of the crown portion. Can be improved.

  As described above, the embodiments of the present invention have been described, but the present invention is not limited to the above-described embodiments, and can be variously modified.

  The above-mentioned grooves 12 and 14 may extend to the sole side, and the width and depth of the grooves may change as they move from the crown portion to the side. Further, the two grooves 12, 14 are formed linearly along the toe-heel direction, but may be formed obliquely so as to intersect. Further, in the present invention, as long as the flexibility of the face center C is suppressed and the toe side and the heel side of the face portion are easily bent, the specific configuration can be appropriately modified. For example, the thickness of the head body on the toe side and the heel side may be made relatively thin, and the face structure may be configured such that the thickness is changed or ribs are formed. Furthermore, the configuration such as the shape and material of the outer shell member can be appropriately modified.

DESCRIPTION OF SYMBOLS 1 Golf club head 3 Head main body 5 Face part 6 Crown part 7 Sole part 12 Toe side groove 14 Heel side groove C Face center

Claims (3)

A golf club head having a hollow metal head body having a face portion, a crown portion, and a sole portion,
On the face portion side of the head body, a toe-side groove formed from the crown portion to the toe-side side portion , and a heel-side groove formed from the crown portion to the heel-side side portion ,
The toe-side groove and the heel-side groove are not formed in the central region of the crown portion, and have a separate structure separated in the toe-heel direction ,
The heel side groove is formed so as to rise to the upper end side of a hosel part formed in the crown part on the crown part side, and is formed to rise to an intermediate part of the hosel part on the side part side. A golf club head divided by the hosel portion . In consideration of a vertical plane passing through the center (C) of the face portion and a horizontal plane, the toe-side groove is formed at a position 15 mm away from the vertical surface on the toe side, and the heel-side groove is formed on the vertical surface. On the heel side it is formed from a position 15 mm away,
The golf club head according to claim 1 , wherein each of the grooves terminates at a position substantially reaching the horizontal plane . 3. The golf club head according to claim 1 , wherein a groove width of the toe-side groove and a groove width of the heel-side groove are formed to be wider than a thickness of the crown portion . 4.

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