JP3628920B2 - Wood type golf club head - Google Patents

Description

【００２５】
テストの結果、参考例のヘッドでは、陥没、割れ等を生じることなしに３０００発を無事打ち終えることができたが、比較例のヘッドでは、約２０００発前後でクラウン部に図５（ｂ）に示したような陥没が生じた。
【００２６】
【発明の効果】
上述したように、請求項１記載の発明では、フェース部の裏面の周縁に厚さが大きい厚肉部を連ねるとともに、この厚肉部のバックフェース側に厚さが小の薄肉部を設けたことにより、フェース部の周辺の強度を向上させつつヘッドの軽量化を図ることができる。また請求項２の発明では、ヘッドの重心位置をより低くすることが可能になり、ひいては球が上がりやすいヘッドを提供しうる。
【図面の簡単な説明】
【図１】本実施形態のヘッドの切断斜視図である。
【図２】そのＸ−Ｚ平面に沿った端面図である。
【図３】そのＸ−Ｙ平面に沿った端面図である。
【図４】本発明の他の実施形態を示すヘッドの切断斜視図である。
【図５】（ａ）は従来のヘッドの断面図、（ｂ）はその損傷状態を示す断面図である。
【符号の説明】
１ ヘッド
２ フェース部
３ ヘッド本体
３ａ クラウン部
３ｂ ソール部
３ｃ サイド部
４ 厚肉部
５ 薄肉部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wood-type golf club head that can be reduced in weight while increasing strength around a face portion.
[0002]
[Prior art and problems to be solved by the invention]
In recent years, wood-type golf club heads having hollow portions have increased in volume due to improvements in manufacturing technology, etc., and heads using low specific gravity and high strength titanium alloy heads of 300 cc or more, and using stainless steel Even in that case, products with more than 200cc can be produced. Further, as the head volume increases in this way, an increase in head weight must be avoided in consideration of the weight balance of the club. For this reason, conventionally, by increasing the thickness of each part of the head, the volume is increased while maintaining the weight of the head.
[0003]
For example, as shown in FIG. 5A, the thickness of the head is reduced by reducing the thickness at a portion excluding the face portion f where a large impact force acts, that is, the crown portion b and the sole portion c of the head a. Has been done. Further, for example, Japanese Patent Application Laid-Open No. 9-99121 and Japanese Patent Application Laid-Open No. 7-284546 disclose that the thickness is partially reduced in the crown part b and the sole part c. However, in the head a as shown in FIG. 5A, the strength around the face portion f cannot withstand repeated impact loads caused by hitting the ball. For example, as shown in FIG. There is a possibility that a depression e occurs in b or the like, or a crack or a crack occurs in the head a.
[0004]
The present invention has been devised in view of the above problems, and a back surface of the face portion is provided on a head body including a crown portion, a sole portion, and a side portion extending from the periphery of the back surface of the face portion to the back face side. A thick wall portion having a large thickness extending from the peripheral edge to the back face side, and a thin wall portion connected to the back face side of the thick wall portion and having a smaller thickness than the thick wall portion. In addition, by regulating the thickness, width, length, etc. of the thick wall portion within a certain range, a wood type golf club head capable of reducing the weight of the head while increasing the strength around the face portion is provided. It is an object.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 of the present invention comprises a head body including a face portion for hitting a ball, and a crown portion, a sole portion, and a side portion extending from the periphery of the back surface of the face portion to the back face side, and A wood-type golf club head having a hollow portion formed therein, wherein the head body has a thick portion with a thickness of 0.8 to 1.5 mm extending from the periphery of the back surface of the face portion to the back face side. The thick portion includes at least part of a thin portion continuous with the back face side and having a thickness smaller than that of the thick portion, and the thickness Ta of the thick portion and the thickness Tb of the thin portion. (Tb / Ta) is 0.6 to 0.9, the width of the thick part measured from the surface of the face part to the back face side is 10 to 50 mm, and the thick part is a face. 50 of the total length of the periphery of the part %, And the width of the thick portion of the sole portion is larger than the width of the thick portion of the crown portion, and the face portion 2 has a thickness Tf. Is 2.0 to 3.5 mm, and the thickness Ta of the thick portion 4 is smaller than the thickness Tf of the face portion 2.
[0006]
Further, in the invention according to claim 1, the width of the thick portion of the sole portion is larger than the width of the thick portion of the crown portion, and the face portion 2 has a thickness Tf (shown in FIG. 2). 2.0-3.5 is mm, yet the thickness Ta of the thick portion 4, and smaller than the thickness Tf of the face portion 2.
[0007]
The invention according to claim 2 is characterized in that the width of the thick portion of the sole portion is larger than the width of the thick portion of the crown portion, and the invention according to claim 3 is characterized in that the side portion and The sole portion is provided with a discontinuity portion 7 formed of a thin portion due to the discontinuation of the thick portion.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cut perspective view of a wood-type golf club head (hereinafter simply referred to as “head”) 1, and FIG. 2 is an end view of the head 1 cut along the XZ plane of FIG. 3 shows end views of the head 1 cut along the XY plane of FIG. In the figure, a head 1 includes a face portion 2 for hitting a ball, and a crown portion 3a, a sole portion 3b, and a side portion 3c extending from the periphery 2b (shown in FIG. 2) of the back surface 2a of the face portion 2 to the back face B side. The head body 3 includes
[0009]
For example, the head 1 of the present embodiment is made of a metal material, and a hollow portion i is formed therein. The hollow part i may be left hollow or filled with a foamed resin or the like. Further, in the metal head 1 having such a hollow portion i, the head volume has been increasing in size in recent years, and is formed, for example, in the range of about 200 to 350 cm ³ , from the surface of the face portion 2 to the end on the back face B side. The maximum depth length L (shown in FIG. 2) is set to about 60 to 100 mm, for example.
[0010]
The face portion 2, its thickness Tf (shown in FIG. 2) and 2.0 to 3.5 mm, more preferably not being formed by 2.5～3.0Mm. When the thickness Tf of the face portion 2 is less than 2.0 mm, there is a risk of damage such as cracks or dents in the face portion 2 due to impact when the ball is hit. There is a tendency that the resilience of the air is relatively lowered and the flight distance is impaired.
[0011]
In the present embodiment, the head body 3 includes the crown portion 3a that forms the upper surface of the head 1, the sole portion 3b that forms the bottom surface of the head 1, and the face portion 2 between the crown portion 3a and the sole portion 3b. The side portion 3c extends from the toe t through the back face B side to the heel h of the face portion 2, and a shaft insertion portion 3d protruding on the heel h side of the crown portion 3a. The head body 3 according to this embodiment is connected to the thick portion 4 having a large thickness extending from the peripheral edge 2b of the back surface 2a of the face portion 2 to the back face B side, and to the back face B side of the thick portion 4. In addition, the thin part 5 is formed to have at least a part of the thin part 5 having a thickness smaller than that of the thick part 4.
[0012]
In this example, all the portions of the crown portion 3a, the sole portion 3b, and the side portion 3c are illustrated as including the thick portion 4 and the thin portion 5 respectively. In this way, by connecting the thick part 4 having a large thickness Ta to the peripheral edge 2b of the back surface 2a of the face part 2, it helps to improve the strength of the periphery of the face part 2 and can withstand the impact when hitting the ball. Strength can be imparted. In particular, as described above, in the case where the depth length L of the head 1 is large, for example, 70 mm or more, if the thickness of the head body 3 is reduced, the strength is likely to be insufficient. It can be suitably employed.
[0013]
Here, if the thickness Ta of the thick portion 4 is too small, the peripheral reinforcement effect of the face portion 2 tends to be relatively lowered. Conversely, if the thickness Ta is too large, for example, the head 1. It is easy to invite excessive weight increase. From this point of view, the thickness Ta of the thick portion 4 smaller than the thickness Tf of the full Esu portion 2, and more specifically is set to 0.8 to 1.5 mm, more preferably 0.8 It is desirable that the thickness be -1.2 mm, more preferably 0.8-1.0 mm.
[0014]
The ratio (Tb / Ta) between the thickness Ta of the thick portion 4 and the thickness Tb of the thin portion 5 is set to 0.6 to 0.9. If the ratio (Tb / Ta) is less than 0.6, the difference between the thicknesses Ta and Tb of the thick part 4 and the thin part 5 becomes large. For example, the thin part 5 becomes excessively thin and the strength decreases. In contrast, the thickness Ta of the thick portion 4 tends to be excessively thick and increase the weight. When the ratio (Tb / Ta) exceeds 0.9, the difference between the thicknesses Ta and Tb is not substantial, and it is difficult to achieve both strength improvement and weight suppression of the head 1. . From such a viewpoint, the ratio (Tb / Ta) is more preferably 0.6 to 0.8.
[0015]
The thickness Tb of the thin-walled portion 5 is preferably 0.5 to 1.0 mm, more preferably 0.6 to 0.9 mm, from the viewpoint of weight reduction and strength. In the head 1 of the present embodiment, the thin portion 5a of the crown portion 3a, the thin portion 5b of the sole portion 3b, and the thin portion 5c of the side portion 3c are all connected to the thick portion 4 and have a substantially constant thickness. An example extending to the B side is illustrated, but for example, a portion where the thickness is appropriately increased may be included in the intersection portion of the crown portion 3a and the side portion 3c.
[0016]
In addition, in this embodiment, each said thick part 4 has illustrated the thing from which the boundary part K with the said thin part 5 reduces gradually toward the said thin part 5. As shown in FIG. Thereby, it is possible to effectively prevent a large rigidity step from occurring in the head main body 3 and to prevent stress from being concentrated on the boundary portion K. It should be noted that the provision regarding the “thickness Ta of the thick portion 4” relates to the thickness when the thickness of the thick portion 4 is substantially constant, and the thickness of the thick portion 4 continuously changes. In such a case, it is preferable that at least the average value satisfies the numerical range, and it is particularly preferable that all thickness values that change vary within the numerical range.
[0017]
Further, it is desirable that the thick portion 4 has a width W measured from the surface 2d of the face portion 2 to the back face B side of 10 to 50 mm, more preferably 15 to 35 mm. If the width W of the thick portion 4 is less than 10 mm, the peripheral portion of the face portion 2 cannot be sufficiently reinforced, and cracks and dents in the peripheral portion tend to still easily occur. If it exceeds, the weight of the head 1 tends to be significantly increased. The width W may be constant in each part, or may be changed within a range of 10 to 50 mm and at each position.
[0018]
In the form shown in FIG. 1 , the head portion such as the crown portion 3a, the side portion 3c (toe side), the sole portion 3b, the side portion 3c (heel side), and the crown portion 3a is disposed on the back face B side of the thick portion 4. while continuously annularly 1 inside you are exemplified those thin portion 5 extending in the back face portion B side. By weight reduction is even more reduced by connecting the thin-walled portion 5 which continues the more effectively achieve weight reduction of the head 1 while increasing the strength of the periphery of the face portion 2.
[0019]
If the area where the thick part 4 is formed is less than 50% of the total length of the peripheral edge 2b of the face part 2, the reinforcing area is reduced, and there is a risk that the periphery of the face part 2 will be dented and cracked. There is .
[0020]
It should be noted that the weight distribution design of the head 1 can be made by changing the thickness Ta and width W of the thick portion 4a of the crown portion 3a, the thick portion 4b of the sole portion 3b, and the thick portion 4c of the side portion 3c. It can be done together. That is, when the width W of the thick portion 4b of the sole portion 3b is made larger than the width W of the thick portion 4a of the crown portion 3a, thereby increasing the weight of the thick portion 4a on the sole portion 3b side. Can lower the position of the center of gravity of the head 1 and can thus provide a head in which the sphere is likely to rise. Also, by changing the thickness, width, etc. of the thick part 4ct on the toe side of the side part 3c and the thick part 4ch on the heel side of the side part 3c, the center of gravity position of the head is made closer to the toe side or heel side. It can also be installed.
[0021]
In Figure 4, the thick portion 4 shows another embodiment of that formed in the region of less than 50% or more and 100% of the total length of the periphery 2b of the face portion 2. That is, one or more discontinuous portions 7 made of the thin portion 5 due to the discontinuity of the thick portion 4 are formed in the side portion 3c and the sole portion 3b. As a result, the crown portion 3a, which has a relatively large impact when hitting a ball, is illustrated in which the thick portion 4 is formed in the entire range along the periphery of the face portion 2. This example helps to further reduce the weight of the head 1.
[0022]
Although the embodiment of the present invention has been described in detail above, the head 1 of the present embodiment is different from the conventional one by integrally joining one or more members formed by casting or forging by welding, brazing, caulking, or the like. It can be produced similarly. As the metal material for forming the head 1, various materials such as stainless steel, aluminum alloy, titanium, titanium alloy (for example, so-called 6-4 titanium (Ti-6% Al-4% V alloy)) can be used. In addition, amorphous metal or the like can be used from the crystal structure side. The face portion 2 and the head main body 3 may be made of the same material or different materials.
[0023]
【Example】
The wood type golf club head shown in FIGS. 1 to 3 is made using stainless steel (SUS630) ( reference example), and the wood type golf club (thickness of 0.9 mm, thin wall) is attached to the shaft. Part thickness of 0.6 mm). The thick part was formed in an area of 100% of the total length of the peripheral edge of the face part, and its width W was set to 30 mm. The club was attached to a swing robot, and a 3000 shot durability test was performed at a head speed of 50 m / s and at the center of the face portion. For comparison, as shown in FIG. 5A, a wood-type golf club head in which the crown portion, the sole portion, and the side portion have a substantially uniform thickness (about 0.7 mm) is prototyped. (Comparative Example) Similarly, the impact durability test was conducted. Table 1 shows the test results.
[0024]
[Table 1]

[0025]
As a result of the test, in the head of the reference example, 3000 shots were successfully completed without causing depression, cracking, or the like, but in the head of the comparative example, the crown portion was about 2000 shots at the crown portion. The depressions shown in the above occurred.
[0026]
【The invention's effect】
As described above, in the first aspect of the invention, the thick part having a large thickness is connected to the periphery of the back surface of the face part, and the thin part having a small thickness is provided on the back face side of the thick part. As a result, the weight of the head can be reduced while improving the strength around the face portion. Further, according to the second aspect of the present invention, it is possible to lower the position of the center of gravity of the head, and as a result, it is possible to provide a head in which the sphere is likely to rise.
[Brief description of the drawings]
FIG. 1 is a cut perspective view of a head according to an embodiment.
FIG. 2 is an end view along the XZ plane.
FIG. 3 is an end view along the XY plane.
FIG. 4 is a cut perspective view of a head showing another embodiment of the present invention.
5A is a cross-sectional view of a conventional head, and FIG. 5B is a cross-sectional view showing a damaged state thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Head 2 Face part 3 Head main body 3a Crown part 3b Sole part 3c Side part 4 Thick part 5 Thin part

Claims (3)

A wood-type golf club having a face portion for hitting a ball and a head body including a crown portion, a sole portion, and a side portion extending from the periphery of the back surface of the face portion to the back face side, and having a hollow portion formed therein. Head,
The head body has a thick portion with a thickness of 0.8 to 1.5 mm extending from the peripheral edge of the back surface of the face portion to the back face side;
Containing at least a portion of the thin wall portion that is continuous with the back face side of the thick wall portion and has a smaller thickness than the thick wall portion,
And the ratio (Tb / Ta) of the thickness Ta of the thick part and the thickness Tb of the thin part is 0.6 to 0.9,
Further, the width of the thick part measured from the surface of the face part to the back face side is set to 10 to 50 mm, and the thick part covers an area of 50% or more and less than 100% of the total length of the peripheral edge of the face part. Formed,
The width of the thick part of the sole part is larger than the width of the thick part of the crown part,
The face portion 2 has a thickness Tf of 2 . 0-3.5mm,
In addition, the wood-type golf club head is characterized in that the thickness Ta of the thick portion 4 is smaller than the thickness Tf of the face portion 2. 2. The wood-type golf club head according to claim 1, wherein a thickness Tb of the thin portion is 0.5 to 1.0 mm. 3. The wood-type golf club head according to claim 1, wherein the side portion and the sole portion are provided with a discontinuous portion including a thin portion due to the discontinuity of the thick portion.

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