Golf club head

Abstract

Achieving both improved golf club head performance through weight redistribution and adjustment of the center of gravity. [Solution] This golf club head is a hollow golf club head with a volume of 400cc or more and 460cc or less, and comprises a face made of metal, a sole made of carbon fiber reinforced resin, a crown made of carbon fiber reinforced resin, and a first weight member, wherein the sole has a region that overlaps the sole side of the face, and the first weight member is detachably fixed to a weight mounting portion located on the sole side of the face through a through hole provided in the region.

Description

Technical Field

[0001] The present invention relates to a golf club head.

Background Art

[0002] Conventionally, in a wood-type golf club head, it has been proposed to make the sole part and / or the crown part of a carbon fiber reinforced resin. The surplus weight generated by making the sole part and / or the crown part of a carbon fiber reinforced resin is redistributed to an arbitrary position inside the golf club head, for example, and is utilized to improve the performance of the golf club head.

[0003] On the other hand, in a wood-type golf club head, there is a demand to vary the center of gravity. However, when the sole part is made of a carbon fiber reinforced resin, it is difficult to provide a mechanism for adjusting the center of gravity position in the sole part.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to achieve both performance improvement of a golf club head by redistribution of surplus weight and adjustment of the center of gravity position.

Means for Solving the Problems

[0006] This golf club head is a hollow golf club head with a volume of 400cc to 460cc, and comprises a face made of metal, a sole made of carbon fiber reinforced resin, a crown made of carbon fiber reinforced resin, and a first weight member. The sole has a region that overlaps the sole side of the face, and the first weight member is detachably fixed to a weight mounting portion located on the sole side of the face through a through hole provided in the region. [Effects of the Invention]

[0007] According to the disclosed technology, it is possible to improve the performance of the golf club head by redistributing excess weight while simultaneously adjusting the center of gravity. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view illustrating a golf club head 1 according to the first embodiment. [Figure 2] This is a bottom view illustrating a golf club head 1 according to the first embodiment. [Figure 3] This is a top view of the golf club head 1 according to the first embodiment, with the crown portion removed. [Figure 4] This is a cross-sectional view illustrating a golf club head 1 according to the first embodiment. [Figure 5] This is an exploded view illustrating a golf club head 1 according to the first embodiment. [Figure 6] This is a perspective view illustrating the body portion that constitutes the golf club head according to this embodiment. [Figure 7] This is a perspective view illustrating the first weight member that constitutes the golf club head according to this embodiment. [Figure 8] This is a perspective view illustrating a second weight member that constitutes the golf club head according to this embodiment. [Modes for carrying out the invention]

[0009] The embodiments will be described below with reference to the drawings. In each drawing, the same components are denoted by the same reference numerals, and redundant explanations may be omitted.

[0010] <First Embodiment> Figure 1 is a perspective view illustrating a golf club head 1 according to the first embodiment. Figure 2 is a bottom view illustrating a golf club head 1 according to the first embodiment. Figure 3 is a top view of the golf club head 1 according to the first embodiment with the crown removed. Figure 4 is a cross-sectional view illustrating a golf club head 1 according to the first embodiment. Figure 5 is an exploded view illustrating a golf club head 1 according to the first embodiment. Figure 6 is a perspective view illustrating the body portion constituting the golf club head according to this embodiment.

[0011] In Figure 1, arrow d1 indicates the toe-heel direction (left-right direction), arrow d2 indicates the crown-sole direction (up-down direction), and arrow d3 indicates the face-back direction (front-back direction). Similar directions may be illustrated in other figures as needed.

[0012] The crown-sole direction is the vertical direction when the golf club head 1 is placed on a horizontal plane according to the specified lie angle and loft angle. The crown-sole direction is approximately perpendicular to the toe-heel direction and the face-back direction. Furthermore, the toe-heel direction and the face-back direction are also approximately perpendicular to each other. Note that viewing in the crown-sole direction is sometimes referred to as a plan view.

[0013] The golf club head 1 shown in Figures 1 to 6 is a wood-type golf club head, such as a driver. The golf club head 1 is a hollow golf club head with a volume of 400cc to 460cc. In the golf club head 1, the surface facing the hollow side is sometimes referred to as the inner surface, and the surface facing the opposite side of the hollow side is sometimes referred to as the outer surface.

[0014] The golf club head 1 has a face portion 10, a sole portion 40, a crown portion 50, a first weight member 60, and a second weight member 70. The golf club head 1 may not have the second weight member 70.

[0015] The face portion 10 includes a body portion 20 and a striking portion 30. The body portion 20 has an opening 20x that opens to the face side, with its lower part extending toward the sole portion 40 side and its upper part extending toward the crown portion 50 side. A hosel portion 21 is provided on the body portion 20. The hosel portion 21 is the part that is connected to the shaft.

[0016] The striking portion 30 is a plate-like member fixed within the opening 20x of the body portion 20. The striking portion 30 can be fixed within the opening 20x of the body portion 20, for example, by welding, adhesion, etc. The striking portion 30 has a striking face 30f for striking the ball and a back face 30h that is the opposite face of the striking face 30f. Note that the striking portion 30 has a predetermined thickness, the striking face 30f forms the outer surface of the striking portion 30, and the back face 30h forms the inner surface of the striking portion 30.

[0017] The face portion 10 is, for example, made of metal. The face portion 10 can be made of a metal having a specific gravity of 4 or more and 6 or less, for example. Examples of the metal constituting the face portion 10 include titanium, titanium alloy, stainless steel, aluminum, aluminum alloy, iron-based metal, magnesium, magnesium alloy, etc. In the face portion 10, the body portion 20 and the striking portion 30 may be made of the same material or different materials.

[0018] The sole portion 40 is the part that mainly forms the bottom of the golf club head 1. The body portion 20 has a step portion 22 for joining the sole portion 40. The step portion 22 is recessed toward the hollow side of the golf club head 1 compared to the peripheral portion. The sole portion 40 can be joined to the step portion 22 of the body portion 20, for example, by an adhesive.

[0019] The crown portion 50 is the upper part of the golf club head 1. The body portion 20 has a stepped portion 23 for joining the crown portion 50. The stepped portion 23 is recessed towards the hollow side of the golf club head 1 compared to the surrounding area. The sole portion 40 has a bent portion 45 for joining the crown portion 50. The crown portion 50 can be joined to the stepped portion 23 of the body portion 20 and the bent portion 45 of the sole portion 40, for example, by adhesive. In other words, the sole portion 40 and the crown portion 50 can be directly bonded together without the use of metal members.

[0020] The sole portion 40 and the crown portion 50 are made of carbon fiber reinforced resin. The sole portion 40 and the crown portion 50 can be made of a material with a specific gravity of 1 or more and 2 or less. Carbon fiber reinforced resin is a composite material of carbon fibers that serve as reinforcing members and resin. Examples of resins that make up carbon fiber reinforced resin include epoxy resin, phenolic resin, polyester resin, polycarbonate resin, etc.

[0021] By forming the sole portion 40 and the crown portion 50 from carbon fiber reinforced resin, the weight can be reduced compared to when the sole portion 40 and the crown portion 50 are formed from metal. This creates excess weight, which can then be distributed to the optimal position on the golf club head 1. The sole portion 40 and the crown portion 50 can be constructed, for example, using carbon fiber reinforced resin sheets. The sole portion 40 and the crown portion 50 may also be constructed from laminated carbon fiber reinforced resin sheets.

[0022] To manufacture the sole portion 40 and the crown portion 50, for example, a pre-impregnated material (prepreg material) made by laminating carbon fiber reinforced resin sheets is prepared. Then, this pre-impregnated material is attached to a mold to form the basic shape of the sole portion 40 and the crown portion 50. Next, the basic shape of the sole portion 40 and the crown portion 50 is heated. As a result, the epoxy resin or other base resin in the pre-impregnated material is heat-cured, and the sole portion 40 and the crown portion 50 are completed.

[0023] The sole portion 40 has a region R that overlaps the sole side of the face portion 10. Region R is the portion of the sole portion 40 located on the stepped portion 22. The first weight member 60 is detachably fixed to the weight mounting portion 24 located on the sole side of the face portion 10 via a through hole 40x provided in region R of the sole portion 40.

[0024] The sole portion 40 and the crown portion 50 constitute part of the contour shape of the golf club head.

[0025] Figure 7 is a perspective view illustrating a first weight member constituting the golf club head according to this embodiment. As shown in Figure 7, the first weight member 60 is, for example, elongated. The first weight member 60 comprises, for example, a first cylindrical portion 60a and a second cylindrical portion 60b provided on one side of the first cylindrical portion 60a. The second cylindrical portion 60b has a smaller diameter than the first cylindrical portion 60a and is provided concentrically with the first cylindrical portion 60a. The diameters of the first cylindrical portion 60a and the second cylindrical portion 60b are, for example, 6.6 mm to 12 mm. The axial length of the first weight member 60 is, for example, 8 mm to 13 mm.

[0026] The first weight member 60 can be made of a material with a specific gravity of 2.7 or more and 14 or less. Specifically, the first weight member 60 can be made of metal. Examples of metals that make up the first weight member 60 include iron, aluminum, titanium, tungsten, and tungsten alloys. The weight of the first weight member 60 is preferably 2g or more and 12g or less. By making the first weight member 60 2g or more, the effect of providing the first weight member 60 can be fully realized. By making the first weight member 60 12g or less, the overall weight of the golf club head 1 can be reduced.

[0027] The end face of the first cylindrical portion 60a is provided with a groove, for example, a hexagonal one. A male thread is provided on a part of the outer circumference of the second cylindrical portion 60b. The weight mounting portion 24 has a cylindrical portion into which the first weight member 60 can be inserted, and a female thread is provided on the inner wall of the cylindrical portion. By inserting the tip of a hex wrench or the like into the groove of the first cylindrical portion 60a, the first weight member 60 can be rotated, and the male thread of the second cylindrical portion 60b can be screwed into the female thread of the weight mounting portion 24. In this way, the first weight member 60 is detachably fixed to the weight mounting portion 24.

[0028] The golf club head 1 may have at least one first weight member 60, or it may have more than one. In the illustrated example, the golf club head 1 has two first weight members 60. Correspondingly, two weight mounting parts 24 are arranged on the sole side of the face portion 10.

[0029] As shown in Figure 3, multiple first weight members 60 can be arranged on both sides of a virtual line V that passes through the center of gravity of the striking surface 30f of the face portion 10 and is perpendicular to the striking surface 30f, in a plan view. For example, when two first weight members 60 are arranged, each first weight member 60 can be arranged symmetrically with respect to the virtual line V in a plan view. If there is only one first weight member 60, for example, it can be placed in a position that coincides with the virtual line V in a plan view.

[0030] Multiple first weight members 60 can be arranged in a plan view parallel to, for example, the toe-heel direction. For example, when two first weight members 60 are arranged, the direction of arrangement is defined in a plan view by a straight line connecting the centers of the tip faces of each first weight member 60. Here, parallelism is allowed to have an error of ±10 degrees.

[0031] Thus, in the golf club head 1, the sole side of the metal face portion 10 extends toward the sole portion 40 made of carbon fiber reinforced resin, and the structure is such that the sole portion 40 overlaps the sole side of the face portion 10 in a region R. With this structure, a sufficient area for placing the weight attachment portion 24 can be secured on the sole side of the face portion 10.

[0032] In other words, arranging the weight attachment section 24 on the sole section 40, which is made of carbon fiber reinforced resin, is difficult in terms of manufacturing technology and production lead time. However, by adopting the above structure, it becomes possible to use a sole section 40 made of carbon fiber reinforced resin and also to arrange the weight attachment section 24. Furthermore, by detachably fixing the first weight member 60 of the required weight to the weight attachment section 24, it becomes possible to adjust the center of gravity of the golf club head 1.

[0033] In particular, by arranging multiple weight mounting sections 24 on the sole side of the face section 10 and detachably fixing a first weight member 60 of the required weight to each weight mounting section 24, the degree of freedom in adjusting the center of gravity of the golf club head 1 is improved. In this case, multiple first weight members 60 with different specific gravities may be detachably fixed to each weight mounting section 24. Furthermore, by arranging multiple first weight members 60 on both sides of an imaginary line V that passes through the center of gravity of the hitting surface 30f of the face section 10 and is perpendicular to the hitting surface 30f in a plan view, it becomes possible to adjust the center of gravity in the toe-heel direction.

[0034] Furthermore, the golf club head 1 can generate excess weight by employing a sole portion 40 and a crown portion 50 made of carbon fiber reinforced resin. By optimally redistributing this generated excess weight, the performance of the golf club head 1 can be improved. For example, the golf club head 1 can have a second weight member 70.

[0035] The second weight member 70 is fixed to the back side of the sole portion 40. The second weight member 70 can be fixed to the back side of the sole portion 40 by screwing it in using screws 80 from the inner surface side of the sole portion 40. The second weight member 70 may also be fixed to the back side of the sole portion 40 by screwing it in and using adhesive.

[0036] The second weight member 70 becomes part of the design of the golf club head 1, improving the design freedom. For example, by making the second weight member 70 a different color from the sole portion 40 and / or the crown portion 50, a unique design can be achieved.

[0037] The second weight member 70 has a higher specific gravity than the face portion 10, the sole portion 40, and the crown portion 50. The second weight member 70 can be made of a material with a specific gravity of 7 to 14, for example. Specifically, the second weight member 70 can be made of metal. Examples of metals that make up the second weight member 70 include iron, tungsten, and tungsten alloys. The weight of the second weight member 70 is preferably 6g to 12g. By making the second weight member 70 6g or more, the effect of providing the second weight member 70 can be fully realized. By making the second weight member 70 12g or less, the overall weight of the golf club head 1 can be reduced.

[0038] Figure 8 is a perspective view illustrating a second weight member constituting a golf club head according to this embodiment. As shown in Figure 8, it is preferable that the second weight member 70 has two or more female screw holes 70x. This allows the second weight member 70 to be firmly fixed to the back side of the sole portion 40 and prevents the second weight member 70 from rotating. In the manufacturing process of the golf club head 1, the second weight member 70 can be fixed to the outer surface of the sole portion 40 by screwing screws 80 into the female screw holes 70x from the inner side of the sole portion 40 before joining the sole portion 40 to the face portion 10 and the crown portion 50.

[0039] In this way, the golf club head 1 can have its center of gravity increased by fixing the second weight member 70 to the back side of the sole portion 40. This makes it easier for the ball to go up when struck. Also, by fixing the second weight member 70 to the back side of the sole portion 40, the moment of inertia can be increased. This makes it less likely for the golf club head 1 to rotate even if the ball is struck off-center, reducing the amount of curve and distance lost from the shot.

[0040] For example, in golf club head 1, the center of gravity height can be set to 26 mm or more and 29 mm or less, and the center of gravity depth to 32 mm or more and 34 mm or less. Furthermore, the moment of inertia in the face-back direction can be set to 2800 g·cm². 2 More than 3100g cm 2 Below, the moment of inertia in the toe-heel direction is 4500 g·cm. 2 More than 4800g cm 2 The following can be achieved. Additionally, the center of gravity distance can be between 38mm and 40mm, and the center of gravity angle between 24 and 26 degrees.

[0041] Furthermore, in the golf club head 1, the second weight member 70 is screwed in from the inner side of the sole portion 40. This structure prevents the screws from being visible from the outside, thus not detracting from the appearance.

[0042] Although preferred embodiments have been described in detail above, the invention is not limited to the embodiments described above, and various modifications and substitutions can be made to the embodiments described above without departing from the scope of the claims.

[0043] For example, the golf club head 1 may have a stopper portion 90 that contacts the back surface 30h of the striking portion 30. The stopper portion 90 allows for reinforcement of the striking portion 30 and adjustment of the stiffness distribution. Alternatively, a sleeve 100 may be housed in the hosel portion 21. By housing the sleeve 100, the shaft axis is tilted with respect to the central axis of the hosel portion 21, so the lie angle and face angle can be varied by rotating the sleeve 100 axially to change the fitting position with the hosel portion 21. [Explanation of Symbols]

[0044] 1 Golf club head 10 Face section 20 Body part 20x opening 21 Hosel section 22,23 Stepped section 24 Weight attachment section 30 Hitting Department 30f striking surface 30h back 40 Sole 40x through holes 45 Folded section 50 Crown section 60 First weight member 60a First cylindrical section 60b Second cylindrical section 70 Second weight member 70x Female threaded hole 80 screw 90 Buttocks 100 sleeves

Claims

1. A hollow golf club head with a volume of 400cc or more and 460cc or less, The face is made of metal, The sole is made of carbon fiber reinforced resin, The crown is made of carbon fiber reinforced resin, It has a first weight member, The sole portion includes an area that overlaps the sole side of the face portion, The golf club head is such that the first weight member is detachably fixed to a weight mounting portion located on the sole side of the face portion via a through hole provided in the region.

2. Having a plurality of the first weight members, Multiple weight mounting portions are arranged on the sole side of the face portion. The golf club head according to claim 1, wherein each of the first weight members is detachably fixed to each of the weight mounting portions through through holes provided in the region.

3. The golf club head according to claim 2, wherein the plurality of first weight members are arranged in a plan view on both sides of an imaginary line passing through the center of gravity of the striking surface of the face portion and perpendicular to the striking surface.

4. The golf club head according to claim 3, wherein the plurality of first weight members are arranged in a plan view parallel to the toe-heel direction.

5. The golf club head according to claim 2, wherein a plurality of first weight members having different specific gravities are detachably fixed to each of the weight mounting portions.

6. Having a second weight member, The second weight member has a higher specific gravity than the face portion, the sole portion, and the crown portion. The golf club head according to any one of claims 1 to 5, wherein the second weight member is fixed to the back side of the sole portion.

7. The golf club head according to claim 6, wherein the second weight member is fixed from the inner surface of the sole portion by screwing and adhesive, and constitutes a part of the contour shape of the golf club head.

8. The golf club head according to claim 6, wherein the sole portion and the crown portion constitute a part of the contour shape of the golf club head.

9. The golf club head according to claim 6, wherein the second weight member has two or more female screw holes.

10. The second weight member is made of a material with a specific gravity of 7 or more and 14 or less. The face portion is made of a metal with a specific gravity of 4 or more and 6 or less. The golf club head according to claim 6, wherein the sole portion and the crown portion are made of a material having a specific gravity of 1 or more and 2 or less.

11. The sole portion and the crown portion are made of laminated carbon fiber reinforced resin sheets. The golf club head according to claim 6, wherein the first weight member and the second weight member are made of metal.

12. The golf club head according to any one of claims 1 to 5, wherein the sole portion and the crown portion are directly bonded together without the use of a metal member.

13. The center of gravity height is 26 mm to 29 mm, the center of gravity depth is 32 mm to 34 mm, and the moment of inertia in the face-to-back direction is 2800 g·cm. ２ More than 3100g・cm ２ The following shows that the moment of inertia in the toe-heel direction is 4500 g·cm. ２ More than 4800g・cm ２ The following describes a golf club head according to any one of claims 1 to 5, wherein the center of gravity distance is 38 mm or more and 40 mm or less, and the center of gravity angle is 24 degrees or more and 26 degrees or less.

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