JP6374332B2 - Golf club head and golf club - Google Patents

Description

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

  Conventionally, it has been known that the face portion of a metal head having a hollow structure can be easily bent to prevent the ball from being crushed at the time of hitting, thereby reducing the energy loss due to the deformation of the ball and improving the flight distance. It has been. Therefore, in order to improve the flight distance, the central region of the face portion may be configured to be easily bent. However, the strength of the face portion may be lowered only by being easily bent. Therefore, conventionally, in order to adjust the rigidity and resilience of the face part, a thick part or a rib is provided on the back surface of the face part.

  For example, Patent Document 1 discloses a golf club head with an uneven face that is configured so as to have a stable resilience performance by providing irregularities on the back surface of the face portion of a golf club head having a hollow structure. Specifically, two central thick portions are provided on the back surface of the central portion of the face portion which is most flexible and requires strength, and is separated from the toe side and the heel side, and these two central thick portions are provided. Two slopes with different slopes are extended from each part toward the edge part of the face part, and straight ribs are formed from the two central thick parts toward the edge part on the crown side. doing.

JP 2013-66535 A

  However, in Patent Document 1, since linear ribs are connected to two central thick portions for reinforcing the back surface of the central portion of the face portion, the deflection of the entire face portion is regulated by these ribs. Therefore, while it becomes difficult to obtain high resilience performance, stress concentration is likely to occur due to the ribs, and there is also a problem that the face portion is likely to break along the straight line of the ribs.

  The present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide a golf club head and a golf club having a face portion that can ensure high strength while ensuring high resilience performance.

In order to achieve the above object, the present invention provides a golf club head comprising a hollow metal head body having a face portion, a crown portion, a sole portion, and a side portion, wherein the face portion A substantially circular circular central thick part that is thicker than the peripheral part is provided at the center part of the back surface of the circular central thick part and connected to the circular central thick part around the circular central thick part. A peripheral thick part extending in an arc shape along the arc of the circular central thick part is provided without being separated, and on the opposite side of the circular central thick part with respect to the peripheral thick part, and wherein further provided Rukoto thin wall area located on either side of the face portion.

  In the above configuration, a circular central thick part for increasing the strength of this part is provided on the back surface of the central part of the face part which is most flexible and requires strength, and a circular shape is provided around the circular central thick part. Since the peripheral thick part extending in an arc shape along the circular arc of the circular central thick part is provided without being connected to the central thick part, that is, the central circular thick part is provided with a peripheral thickness by a rib or the like. Since it has a distributed thick part distribution structure that is not connected to the meat part, sufficient strength can be ensured while enabling high resilience performance.

  Specifically, the face part is formed with a desired thickness having a desired flexibility, and the center part that is most flexible is reinforced with a circular center thick part, thereby enabling high resilience performance and sufficient strength. However, in this case, by arranging the thin portion so as to surround the circular central thick portion in the central portion, the deflection can be increased and the peripheral portion is not further bent by the peripheral thick portion. By reinforcing in this way, the required rigidity can be ensured while the whole is effectively bent. In particular, since the central circular thick portion is not connected to the peripheral thick portion by a rib or the like, the deflection of the face portion is not restricted more than necessary, and a desired high resilience performance can be realized. Moreover, since the circular central thick part forms a circle and the peripheral thick part also forms an arc, when the ball is hit, the stress is dispersed along the circle (or arc) (no stress concentration occurs), and the circular ( Arc), and as a result, cracking of the face portion can be prevented. In this case, it is preferable that the circular central thick part and / or the peripheral thick part have a flat upper end surface and an inclined surface extending inclined from the upper end surface to the peripheral thin region. . By doing so, the stress is distributed over a wide range by the inclined surface and is transmitted almost uniformly, and cracking of the face portion can be effectively prevented while improving the flexibility of the entire face portion. Furthermore, if the circular central thick part extends to the vicinity of the periphery of the face part located on the crown part side and the sole part side, and the peripheral thick part is provided separately on the toe side and the heel side, the face part concentrates stress. Without being accompanied, it can be greatly bent over a wide area, and since stress can be widely received almost concentrically by an arc, cracking of the face portion can be effectively suppressed.

  The present invention also provides a golf club formed by fixing the golf club head having the above configuration to the tip of the shaft. Throughout this specification, “substantially circular” includes not only a perfect circle but also an ellipse.

  ADVANTAGE OF THE INVENTION According to this invention, a golf club head and a golf club provided with the face part which can ensure sufficient intensity | strength while enabling high resilience performance can be provided.

1 is a front view of a golf club according to an embodiment of the present invention. FIG. 2 is a front view of a golf club head portion of the golf club of FIG. 1. It is sectional drawing (longitudinal sectional drawing) in alignment with the AA of FIG. (A) is a perspective view showing a first example of a welded form of a face member forming a part of a face part of a golf club head, and (b) is a welded form of a face member including the face part of the golf club head. It is a perspective view which shows the 2nd example of this. FIG. 3 is a front view of the face portion of the golf club head of FIG. 2, in which a thickness step formed on the back side of the face portion is drawn with a solid line for easy understanding. FIG. 6 is a front view of a first modification of the face portion in which a thickness step formed on the back side of the face portion is drawn with a solid line for easy understanding. FIG. 9 is a front view of a second modification of the face portion in which a thickness step formed on the back side of the face portion is drawn with a solid line for easy understanding. It is a front view of the 3rd modification of a face part in which the thickness level difference formed in the back side of the face part was drawn with the continuous line for easy understanding.

Hereinafter, an embodiment of a golf club according to the present invention will be described in detail with reference to the drawings.
1 to 5 show an embodiment of a golf club according to the present invention. FIG. 1 is a front view of the golf club. FIG. 2 is a front view of a golf club head portion of the golf club in FIG. 3 is a cross-sectional view (longitudinal cross-sectional view) taken along line AA in FIG. 2, and FIG. 4A is a first example of a welded form of a face member that forms a part of the face portion of the golf club head. FIG. 4B is a perspective view showing a second example of the welding mode of the face member including the face portion of the golf club head, and FIG. 5 is formed on the back side of the face portion for easy understanding. FIG. 3 is a front view of the face portion of the golf club head of FIG. 2, in which the formed thickness difference is drawn with a solid line.

  As shown in FIG. 1, the golf club 1 according to the present embodiment has a lie angle α and a loft angle β (refer to FIG. 3) at the tip of a shaft 5 made of metal or FRP with respect to a reference horizontal plane P. The golf club head 7 having a hollow structure set to) is fastened. In this case, as shown in FIGS. 2 and 3, the head body 7A constituting the head 7 includes a face portion 7a on which a hit ball is formed and a crown portion (backward extending from the upper edge of the face portion 7a). 7b, a sole portion 7c extending rearward from the lower edge of the face portion 7a, a side portion 7d connecting the edges of the crown portion 7b and the sole portion 7c, and the rear side of the side portion 7d And a back portion 7e. The side portion 7d includes a toe portion 7f and a heel portion 7g that pass through the back portion 7e.

  The head body 7A can be integrally formed by casting, for example, a titanium alloy (Ti-6Al-4V, Ti-15V-3Cr-3Sn-3Al), an aluminum alloy, or a magnesium alloy. 4 (a), an opening 8a having a predetermined shape is formed inside a peripheral edge defining the face portion 7a, and a plate-like face member 8 (of the face portion 7a) is formed in the opening 8a. A part of them is fitted and the periphery thereof is joined, for example, by welding (the weld line L2 is indicated by a broken line in FIG. 4A). Alternatively, as shown in FIG. 4 (b), a cup-shaped face member 8A that completely includes the face portion 7a may be welded on the crown portion 7b side (the weld line in FIG. 4 (b)). L3 is indicated by a broken line).

  In this case, for the head main body 7A, each member (face part, crown part, sole part, side part; outer shell body) constituting the head main body 7A is individually formed and fixed by welding, bonding or the like. Alternatively, a plurality of members or partial components of each member may be integrally formed by casting or the like, and they may be fixed by welding, adhesion, or the like. The face member is, for example, titanium, titanium alloy (Ti-15V-3Cr-3Sn-3Al, Ti-6Al-4V, SP700, Ti-15V-6Cr-4Al, Ti-15Mo-5Zr-3Al, Ti-30Nb -10Ta-5Zr etc.) is integrally formed in a plate shape or cup shape by press processing, CNC processing or forging, for example, the outer shell body by welding such as laser welding, brazing, bonding, etc. It is joined to.

  A hosel portion 9 for fastening the tip of the shaft 5 is integrally formed with the head main body 7A. The shaft 5 is fixed to the hosel portion 9 by fitting a tip portion through a shaft insertion hole (not shown) of a socket 9 a formed in the hosel portion 9.

  The face portion 7a is a portion where the hit ball is actually formed. As shown in FIG. 2, the top side edge 7P, the sole side edge 7Q, the toe side edge 7R, , Defined as a region surrounded by the heel side edge 7S (these edges are ridge lines bent toward the back side around the ball striking surface). In FIG. 2, each edge is shown bent, but when these edges (ridge lines) are formed in a curved shape, the edge is defined by the curved top portion. Note that score lines 7L (see FIG. 1) may be separately formed on the face portion 7a, and the face portions 7a may be color-coded according to colors or the like so that the face portion 7a becomes clear.

  For example, a roll that curves along the crown / sole direction (hereinafter also referred to as the up / down direction) is formed on the face portion 7a, and the toe / heel direction (hereinafter also referred to as the left / right direction). A bulge that is curved along the center is formed, and the center (face center) C of the face portion 7a exists in the top region of both curved portions.

Here, a method for specifying the position of the face center C of the face portion 7a will be described.
First, the head is set at a specified lie angle with respect to the reference horizontal plane P (see FIG. 2), and when the face portion is grasped by the toe side edge 7R and the heel side edge 7S defined as described above, -Specify the maximum width (maximum width W) in the heel direction. Then, at the middle point of the specified maximum width W, the perpendicular line L1 is drawn with respect to the reference horizontal plane P, and the points intersecting the top side edge 7P and the sole side edge 7Q are defined as 7P ′ and 7Q ′, respectively. The midpoint of the line segments 7P ′ and 7Q ′ connecting these two points is the face center C.

  3 and 5 clearly show the structure of the face portion 7a of the present embodiment. As can be seen from these drawings, the face portion 7a has a circular central thick portion 20 having a circular shape that is thicker than the peripheral portion at the central portion of the back surface thereof. In this case, at least one (two in this embodiment) arcuate peripheral thick parts 22 and 24 are separated from each other without being connected to the circular central thick part 20, so that the circular central thick part 20 has an arc. (The center of curvature of the peripheral thick portions 22 and 24 is on the inner side where the circular central thick portion 20 is located). Note that, as described above, FIG. 5 is a front view of the face portion 7a, but for the sake of clarity, a thick step (ridge line) formed on the back surface of the face portion 7a is drawn with a solid line.

  In the present embodiment, the circular central thick part 20 and the peripheral thick parts 22 and 24 are integrally formed with the face part 7a by casting or the like, and the circular central thick part 20 includes the crown part 7b side and the sole part 7c. The peripheral thick portions 22 and 24 are provided separately on the toe side and the heel side, respectively, extending to the vicinity of the periphery of the face portion 7a located on the side. In this case, the shortest separation distance between the circular central thick part 20 and the peripheral thick parts 22 and 24 is set to 3 mm to 7 mm, for example, 5 mm. This separation distance may be the same in both peripheral thick portions 22 and 24, or may be different. If they are different, the distance difference is preferably within 3 mm.

  The circular central thick portion 20 has a circular (or may be oval) flat upper end surface 20a and a ring shape (outer shape is extended from the upper end surface 20a to the thin wall region 30 at the periphery. And a circular (or elliptical) inclined surface 20b. Further, the peripheral thick portions 22 and 24 are flat upper end surfaces 22a and 24a extending in an arc shape, and inclined surfaces extending in an arc shape from the upper end surfaces 22a and 24a to the thin regions 30 and 32 in the peripheral portion. 22b and 24b (for example, both sides of the inclined surfaces 22 and 24b reach the periphery of the face portion 7a (for example, the peripheral edges on the crown portion 7b side and the sole portion 7c side)). In this case, it is preferable that the inclination angle of the inclined surface 20b of the circular central thick part 20 with respect to the surface of the thin region 30 that is flat so as to surround the circular central thick part 20 is 1.2 ° to 6 °. Moreover, it is preferable that the inclination | tilt angles of the inclined surfaces 22b and 24b of the peripheral thick parts 22 and 24 with respect to the surface of the thin area | region 30 are 2 degrees-15 degrees. The thickness of the thin region 30 surrounding the circular central thick portion 20 is set to 2.1 mm, for example, and the thickness of the thin region 32 located on both sides of the face portion 7a (toe portion 7f side and heel portion 7g side). For example, the thickness is set to 2.0 mm.

  In addition, the thickness of the circular central thick portion 20 including the thickness of the thin region 30 is set to, for example, 2.2 mm to 2.8 mm at the upper end surface 20a. Further, the thickness of the peripheral thick portions 22, 24 including the thickness of the thin region 30 is set to, for example, 2.2 mm to 2.7 mm at the upper end surfaces 22a, 24a, and in particular, the toe portion 7f. It is preferable to set the peripheral thick part 22 located on the side thin and the peripheral thick part 24 located on the heel part 7g side thick. In any case, the height difference between the flat surfaces of the thin regions 30, 32 and the upper end surfaces 20a, 22a, 24a of the thick portions 20, 22, 24 is set to 0.3 mm to 0.8 mm.

  In the golf club head 7 (face block 7a) of the present embodiment, the sweet spot S of the face portion 7a that is easily bent is above the face center C (particularly closer to the heel portion 7g) and has a circular central thick portion 20. (See FIG. 2). Thus, when the sweet spot S is positioned on the circular central thick wall portion 20 near the heel portion 7g on the upper side of the face center C, the necessary strength can be secured at the portion of the sweet spot S that is easily bent and easily broken, and is caught. Head with good return (head with good return).

  As described above, according to the present embodiment, the circular central thick portion 20 for increasing the strength of this portion is provided on the back surface of the central portion of the face portion 7a that is most flexible and requires strength, Around the circular central thick portion 20, arc-shaped peripheral thick portions 22, 24 that extend away along the arc of the circular central thick portion 20 are separated without being connected to the circular central thick portion 20. In other words, since the central circular thick portion 20 has a distributed thick portion distribution structure in which the central circular thick portion 20 is not connected to the peripheral thick portions 22 and 24 by ribs or the like, it is sufficient to enable high resilience performance. Strength can be secured.

  That is, in this embodiment, the face portion 7a is formed with an appropriate thickness having a desired flexibility, and the central portion that is most flexible is reinforced by the circular central thick portion 20, so that high resilience performance is possible. However, in this case, by arranging the thin region 30 so as to surround the circular central thick portion 20 in the central portion, the deflection can be increased and the peripheral portion can be further increased to the peripheral thick portion 22. , 24 can be reinforced so as not to bend too much, and the required rigidity can be ensured while the whole is effectively bent. In particular, since the central circular thick portion 20 is not connected to the peripheral thick portions 22 and 24 by ribs or the like, the deflection of the face portion 7a is not restricted more than necessary, and a desired high resilience performance can be realized.

  Further, since the circular central thick part 20 forms a circular shape and the peripheral thick parts 22 and 24 also form a circular arc, the stress is distributed along the circle (or the circular arc) when hitting a ball (no stress concentration occurs). ) And bend along a circle (arc), and as a result, cracking of the face portion can be prevented. In this case, the circular central thick part 20 and / or the peripheral thick parts 22 and 24 include a flat upper end face 20a, 22a and 24b and thin areas 30 and 32 in the peripheral part from the upper end face 20a, 22a and 24b. Since the inclined surfaces 20b, 22b, and 24b are inclined and extended, the inclined surfaces 20b, 22b, and 24b disperse stress over a wide range and transmit them almost uniformly, thereby improving the flexibility of the entire face portion 7a. The crack of the face portion 7a can be effectively prevented while improving. Further, the circular central thick part 20 extends to the vicinity of the peripheral edge of the face part 7a located on the crown 7b part side and the sole part 7c side, and the peripheral thick parts 22, 24 are distributed to the toe part 7f side and the heel part 7g side, respectively. Therefore, the face portion 7a can be greatly bent over a wide area without causing stress concentration, and stress can be widely received almost concentrically by an arc so that the crack of the face portion 7a is effectively prevented. Can be suppressed.

  FIG. 6 shows a first modification of the face portion 7a. Also in this case, FIG. 6 is a front view, but for the sake of clarity, the thickness step formed on the back side of the face portion 7a is drawn with a solid line (the same applies to FIG. 8 below).

  As shown in the drawing, the face portion 7a according to the first modification is arranged in an arc shape by dividing the flat upper end surfaces 22a and 24b of the peripheral thick portions 22 and 24 of the above-described embodiment into a plurality of portions. ing. In other words, in the first modification, the two circular arc-shaped peripheral thick portions 22A and 24B are separated from each other around the circular central thick portion 20 without being connected to the circular central thick portion 20. The thick wall portion 20 is provided so as to extend along the arc, and the peripheral thick wall portion 22A (24B) is arranged so as to be spaced apart from each other along the arc and has a flat shape each extending in an arc shape. A plurality (three in the figure) of upper end surfaces 22aa, 22ab, 22ac (24aa, 24ab, 24ac) and from the upper end surfaces 22aa, 22ab, 22ac (24aa, 24ab, 24ac) to the thin-walled regions 30, 32 in the peripheral portion And an inclined surface 22b (24b) extending in an arcuate shape.

  The other configurations are the same as those of the above-described embodiment, and the thickness of each thick portion, the inclination angle of each inclined surface, and between the circular central thick portion and each peripheral thick portion. The separation distance is also the same as in the above-described embodiment. Therefore, even in such a configuration, it is possible to obtain the same effect as that of the above-described embodiment.

  FIG. 7 shows a second modification of the face portion 7a. In this modification, the peripheral thick part 26 extends concentrically with the circular central thick part 20. That is, as shown in the figure, a ring-shaped periphery that is concentrically arranged with the circular central thick part 20 is separated from the circular central thick part 20 without being connected to the circular central thick part 20. A thick wall portion 26 is provided, and the peripheral thick wall portion 26 includes an upper end surface 26a as a flat surface that forms a ring shape, and a ring that extends from the upper end surface 26a to the thin wall regions 30 and 32 in the peripheral portion in an inclined manner. And an arcuate inclined surface 26b. According to such a configuration, the peripheral thick part 26 is disposed concentrically with the circular central thick part 20, so that the central part can be flexed stably.

  FIG. 8 shows a third modification of the face portion 7a. In the face portion 7a according to the third modified example, the flat upper end surface 26a of the peripheral thick portion 26 of the second modified example is divided into a plurality of portions and arranged in an arc shape. That is, in this third modification, a ring-like shape is arranged around the circular central thick part 20 so as to be separated from the circular central thick part 20 without being connected to the circular central thick part 20. The peripheral thick part 26A is provided, and the peripheral thick part 26 is arranged in a plurality of flat shapes (nine in the figure) that are spaced apart from each other along one circle and each extend in an arc shape. Upper end surfaces 26aa to 26ai and inclined surfaces 26b extending from the respective upper end surfaces 26aa to 26ai to the peripheral thin regions 30 and 32 and extending in a ring shape or an arc shape. Even in such a configuration, the same effects as those of the second modification can be obtained.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, A various deformation | transformation is possible in the range which does not deviate from the summary. For example, in the embodiment described above, each thick portion has an inclined surface, but it does not need to have an inclined surface. Moreover, the number of the peripheral thick parts provided around the circular central thick part is also arbitrary.

DESCRIPTION OF SYMBOLS 1 Golf club 5 Shaft 7 Golf club head 7a Face part 7b Crown part 7c Sole part 7d Side part 7A Head main body 20 Circular center thick part 20a Upper end surface 20b Inclined surface 22, 24, 22A, 24A, 26, 26A Thickness around Part 22a, 24a, 26a Upper end surface 22b, 24b, 26b Inclined surface 30, 32 Thin area C Face center S Sweet spot

Claims (8)

A golf club head comprising a hollow metal head body having a face portion, a crown portion, a sole portion, and a side portion,
On the back surface of the face portion, a substantially circular circular central thick portion that is thicker than the peripheral portion is provided at the central portion, and the circular central thick portion is provided around the circular central thick portion. A peripheral thick part extending in an arc shape along the arc of the circular central thick part is provided without being connected to the part, and is opposite to the circular central thick part with respect to the peripheral thick part A golf club head according to claim 1, further comprising a thin region located on both sides of the face portion.   2. The golf club head according to claim 1, wherein the circular central thick portion has a flat upper end surface and an inclined surface extending inclined from the upper end surface to a thin region in the peripheral portion.   The peripheral thick portion is inclined toward the flat upper end surface, and the thin region in the peripheral portion of the circular central thick portion and one of the thin regions located on both sides of the face portion from the upper end surface. The golf club head according to claim 2, further comprising an inclined surface extending as a result.   The circular central thick part extends to the vicinity of the periphery of the face part located on the crown part side and the sole part side, and the peripheral thick part is provided on the toe side and the heel side, respectively. Item 4. The golf club head according to any one of Items 1 to 3. By extending both sides of the inclined surface of the peripheral thick part so as to reach the peripheral edge of the face part on the crown part side and the sole part side , the peripheral thick part becomes the circular central thick part. The golf club head according to claim 4, wherein the golf club head is provided separately on both sides.   The golf club head according to any one of claims 1 to 4, wherein the peripheral thick part extends concentrically with the circular central thick part.   7. The golf club head according to claim 1, wherein a sweet spot of the face portion is positioned on the circular central thick portion above the face center. A golf club comprising: the golf club head according to claim 1 fixed to a tip of a shaft.

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