JP4616526B2 - Wood type golf club head group - Google Patents

Description

【００２６】
テストの結果、実施例のものは、従来例に比べて重心距離の変化量を大きくとることができ、より幅広いゴルファに適用しうるゴルフクラブヘッド群を構成しうることが確認できた。
【００２７】
【発明の効果】
上述したように、請求項１記載の発明では、ヘッド群の各ヘッドは、重量の配分比率が高いヘッド最後方点を、ロフト角αが大きいヘッドほどヒール側に位置させヘッドの形状をロフト角に応じて変化させているため、これに追随してヘッド重心を大きく移動させることができる。従って、ロフト角αが大きいヘッドほど、より多くの重量をヒール側に配分することが可能となり、ひいてはヘッド重心をヒール側に寄せて配することができ、ヘッドの設計自由度を大幅に向上できる。
【００２８】
また、ヘッド群の各ウッド型ゴルフクラブヘッドのロフト角とその重心距離とを一定の関係式で規制することにより、ロフト角が異なるヘッド間において大きな重心距離の変化を設定することができる。
【図面の簡単な説明】
【図１】本実施形態のヘッドを示す斜視図である。
【図２】（Ａ）〜（Ｃ）はウッド型ゴルフクラブヘッド群の各ヘッド輪郭線を示す。
【図３】ヘッドの測定状態を示す正面図である。
【図４】ヘッドの測定状態を示す側面図である。
【図５】ヘッドの測定状態を示す平面図である。
【図６】ヘッド輪郭線の拡大図である。
【図７】本発明の他の実施形態を示す図６のＹ−Ｙ位置の断面図である。
【図８】本発明の他の実施形態を示し、（Ａ）は図３のＺ−Ｚ断面図、（Ｂ）は図６のＹ−Ｙ位置の断面図である。
【符号の説明】
１ ウッド型ゴルフクラブヘッド
２ フェース面
３ フェース部
４ クラウン部
５ ソール部
６ サイド部
７ ネック部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wood type golf club head group composed of a plurality of types of driver golf club head Chigae The filtrate shift angle.
[0002]
[Prior art and problems to be solved by the invention]
A driver's wood type golf club head is usually developed and sold in a series of a plurality of types with different loft angles even if they have the same count (here, # 1). Since golfers usually have different head speeds, a golfer with a high head speed corresponds to a head with a small loft angle. Conversely, a golfer with a low head speed corresponds to a head with a large loft angle.
[0003]
Also, golfers with high head speed generally tend to return the head when the ball is impacted. Normally, the head with the smaller loft angle is set to the toe side and the head is less likely to return. Has been. On the other hand, golfers with a low head speed tend to have difficulty in returning the head, so the center of gravity of the head is set on the heel side and the head is designed to return easily. In designing the center of gravity of the head, usually, a weight member having a large specific gravity is mainly fixed to the inside of the head.
[0004]
However, with the recent increase in head volume and the like, there is no room for fixing the weight member and the like, making it difficult to design an appropriate center of gravity. More specifically, it is difficult to design a large change in the center of gravity of the head.
[0005]
The present invention has been devised in view of such a situation, and the head rearmost point on the head outline projected on the horizontal plane is positioned on the heel side as the head has a larger loft angle, and the center of gravity of the head is arranged on the heel side. The present invention relates to a wood type golf club head group capable of ensuring a large margin for movement of the center of gravity.
[0006]
[Means for Solving the Problems]
The invention described in claim 1 of the present invention is a wood type golf club head group composed of a plurality of types of wood type golf club heads having the same count and different loft angles, and the head volume of each golf club head is It is 250 cm ³ or more, and the shaft center line of the shaft insertion hole in which the shaft is mounted is arranged in a vertical plane and is tilted at a specified lie angle, and the face surface is placed on a horizontal plane according to the specified face angle. In the head measurement state, the head contour line projected onto the horizontal plane is such that the head rearmost point farthest from the vertical plane behind the head is positioned on the heel side with the head having the larger loft angle, and the center of gravity of the head is arranged on the heel side. It is characterized by that.
[0007]
The invention described in claim 1 is a wood-type golf club head group composed of golf club heads of a plurality of types of drivers with different loft angles, each head having a head volume of 250 cm ³ or more, and a shaft. In the head measurement state in which the axial center line of the shaft insertion hole to which is mounted is placed in a vertical plane and tilted at a specified lie angle and the face surface is placed on the horizontal plane according to the specified face angle, The projected head contour line is such that the head rearmost point farthest from the vertical plane behind the head is positioned on the heel side as the head with the larger loft angle and the center of gravity of the head is arranged on the heel side, and the loft angle is 8 -10 degrees, and the center of gravity distance that is the shortest length from the axial center line of the shaft insertion hole to the center of gravity of the head is 32.5 to 37.8 mm, and Wood type golf α ₁ in order from the small loft angle of the club head, ..., α _n (unit: °), the center of gravity distance L _1, ..., L _n (unit: mm) and the time, the following formula ( 1) is satisfied.
(L _n-1 −L _n ) / (α _n −α _n-1 )> 1.1 (unit: mm / °) (1)
According to the invention of claim 2, in the head contour line, a head length that is a length along the vertical plane between a toe end point PT that forms the most toe side and a heel end point PH that forms the most heel side. 2. The ratio (A / B) between B and a length A along the vertical plane between the heel end point PH and the head rearmost point P is 0.35 to 0.65 . It is a wood type golf club head group.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows the head of a driver (# 1) as a wood type golf club head (hereinafter sometimes simply referred to as “head”) 1. The head 1 is connected to a face portion 3 having a face surface 2 which is a surface for hitting a ball, a crown portion 4 which is connected to the upper edge 2a of the face surface 2 and forms the upper surface of the head, and a lower edge 2b of the face surface 2. It connects between a sole portion 5 (not visible in FIG. 1) forming the bottom surface of the head and the crown portion 4 and the sole portion 5 and extends from a toe 2t of the face surface 2 to a heel 2e of the face surface 2 through a back face. An example is provided with a side portion 6 and a neck portion 7 provided in the vicinity of the intersection of the heel side e where the face portion 3, the crown portion 4 and the side portion 6 intersect, and to which one end of a shaft (not shown) is attached. Is done. The neck portion 7 is formed with a circular shaft insertion hole 7a. When the head 1 is adjusted to the lie angle, the shaft center line CL of the shaft insertion hole 7a can be used as a reference.
[0009]
The head 1 can be formed of various metal materials such as aluminum alloy, titanium, titanium alloy, and stainless steel. A titanium alloy having a high specific strength is desirable. In this example, the main part of the head is formed by lost wax precision casting with Ti-6Al-4V, which is an α + β type titanium alloy, and the remaining parts are joined by welding or the like. However, it cannot be overemphasized that it can manufacture by another material and another shaping | molding method, without being limited to such an aspect.
[0010]
If made different The filtrate shift angle, for example 1 °, can be varied at equal angular increments or irregular angular increments about 1.5 ° or 2.0 °. In this embodiment, a wood type golf club head group S (hereinafter simply referred to as “head group”) composed of three types of driver heads 1 whose loft angles are changed by 1 ° in increments of 9 °, 10 ° and 11 °, respectively. Will be explained. The loft angle used in this specification is a real loft angle that is the inclination of the face surface with respect to the axial center line of the shaft insertion hole CL.
[0011]
In FIG. 2, each head 1 of the head group S of the present embodiment is arranged such that the axial center line CL of the shaft insertion hole 7a is arranged in the vertical plane VP1 as shown in FIGS. In the head measurement state in which the face surface 2 is placed on the horizontal plane HP in accordance with the specified face angle δ while being inclined at the angle β, the head contour lines K (K1, K2 in order from the smallest loft angle) are projected onto the horizontal plane HP. , K3). FIG. 6 shows an enlarged head outline K of a head having a loft angle of 9 °.
[0012]
At the head contour lines K1, K2, and K3, the head end point that is farthest from the vertical plane VP1 at the rear of the head (the distance N perpendicular to the vertical plane to the head contour line is maximum as shown in FIG. 6). P1, P2, and P3 are positioned on the heel side as the head has a larger loft angle. That is, the head rearmost point P2 having a loft angle of 9 ° is set on the heel side than the rearmost point P1 of the head having a loft angle of 8 °, and the loft angle is larger than the rearmost point P2 of the head having a loft angle of 9 °. The 10 ° head rearmost point P3 is set on the heel side.
[0013]
In the head group S, the head end point P is arranged on the heel side as the head has a larger loft angle. Specifically, in the head outline K shown in FIG. 6, the toe end point PT that forms the most toe side and the most heel side. A head length B that is a length along the vertical plane VP1 between the heel end point PH and a length A along the vertical plane VP1 between the heel end point PH and the head rearmost point P; This means that the ratio (A / B) of the head becomes smaller as the head has a larger loft angle α. The heel side end PH substantially forms a boundary with the neck portion 7.
[0014]
As described above, each head 1 of the head group of the present embodiment positions the head rearmost point P on the heel side as the head with the larger loft angle α, and changes the shape of the head according to the loft angle α. Since the weight distribution is relatively large in the vicinity of the head rearmost point, by moving the head rearmost point P, the head center of gravity G can be moved following the movement. Therefore, the larger the loft angle α, the more weight can be distributed to the heel side, and the center of gravity G of the head can be arranged closer to the heel side.
[0015]
The volume, mass, length of the neck portion 7 and the like of the head 1 included in the head group S may be set substantially the same or may be different. However, the head volume of each head needs to be set to 250 cm ³ or more. When the head volume is less than 250 cm ³ , even if the head rearmost point P is moved to the heel side and the head shape is changed as described above, the movement of the head center of gravity does not follow such a change in the head shape. It becomes impossible to effectively change the center of gravity of the head effectively. From this point of view, the head volume of each head 1 is 270 cm ³ or more, more preferably 300 cm ³ or more, more preferably is desired to be about 310~450cm ^3.
[0016]
In each head 1 of the head group S, when the head rearmost point P is too close to the heel side, or conversely, too close to the toe side, the head shape becomes unique. It tends to cause a sense of discomfort. From such a viewpoint, the ratio (A / B) is, for example, preferably 0.35 to 0.65, more preferably 0.45 to 0.60. Further, as shown in FIG. 6, on the head contour K, a toe side curve C1 that connects the head rearmost point P and the toe side end PT, and a heel side curve C2 that connects the head rearmost point P and the heel side end PH. Although there is no particular limitation, it is desirable to form smoothly using various curves such as a single arc, a compound arc or an elliptic curve.
[0017]
Although not particularly limited, as described above, by changing the position of the head rearmost point P, the loft angles of the head group S are set to α1,..., Αn (unit: °) in order from the smallest. When the center-of-gravity distance of the head is L1,..., Ln (unit: mm), it is possible to set so as to satisfy the following expression (1).
(Ln-1 -Ln) / (αn-αn-1)> 1.1 (unit: mm / °) (1)
The center-of-gravity distance is the shortest length from the axis center line CL (or an extension thereof) of the shaft insertion hole 7a to the head center-of-gravity G as shown in FIG.
[0018]
In general, the center of gravity distance L decreases as the head center of gravity G approaches the heel side. However, according to the present embodiment, the amount of change in the center of gravity distance L per 1 ° of the loft angle is represented by 1 as shown in the equation (1). It becomes possible to limit to larger than 1 mm, and a larger movement of the center of gravity of the head can be realized. A head group of conventional large heads generally has a value of (Ln-1 -Ln) / (αn -αn-1) smaller than 1.1 (mm / °). Particularly preferably, it is desirable to satisfy the following formula (2), more preferably the following formula (3).
(Ln-1−Ln) / (αn−αn-1) ≧ 1.2 (unit: mm / °) (2)
(Ln-1−Ln) / (αn−αn-1) ≧ 1.5 (unit: mm / °) (3)
[0019]
The center-of-gravity distance L is desirably set, for example, in the range of about 20 to 45 mm, more preferably about 28 to 38 mm. If the center-of-gravity distance L exceeds 45 mm, even if the golfer has a high head speed, it tends to be difficult to return the head. There is a tendency to return too much, and both tend to impair the direction stability of the hit ball.
[0020]
Further, in order to realize a larger movement of the head center of gravity G, as shown in FIG. 7 which is a cross-section at the YY position in FIG. The thickness t2 of the region on the heel side from the direction point P can be made larger than the thickness t1 of the region on the toe side from the rearmost point P of the head. A vertical plane VP2 passing through the head rearmost point P and perpendicular to the vertical plane VP1 is shown in FIGS. 6 and 7. The heel side region and the toe side region have the vertical plane VP2 as a boundary. As a result, in combination with changing the position of the head rearmost point P, the head center of gravity G in the set group S can be changed further greatly.
[0021]
For example, in the crown part 4, the thickness t2 of the heel side region is, for example, about 1.05 to 2.0 times, more preferably about 1.5 to 2.0 times the thickness t1 of the toe side region. It is desirable to set. When the thickness changes, the average thickness is set as described above. Also, the sole portion 4 and the side portion 6 can be set in the same manner as described above when the thickness is changed.
[0022]
8A and 8B show still another embodiment of the present invention.
8A is a cross-sectional view at the ZZ position in FIG. 3, and FIG. 8B is a cross-sectional view at the YY position in FIG. In this example, the vertical surface VP2 passing through the head rearmost point P includes a position where the crown portion 4, the sole portion 5 and the side portion 6 intersect with each other, and the thickness t3 of the intersecting portion F having a predetermined width is set on the toe side or The thickness is larger than the thickness t4 of the heel side portion. In other words, it is desirable that the thickness at the vertical plane VP2 is larger than the thickness at a plane parallel to the vertical plane VP2.
[0023]
As mentioned above, although embodiment of this invention was explained in full detail, the weight member etc. with large specific gravity can also be used together, for example. In this case, since the head shape is changed instead of the weight member alone, the effect can be sufficiently exerted even if a light weight member is used. Further, the wood type golf club head group of the present invention is implemented as a wood type golf club group with a shaft attached thereto.
[0024]
【Example】
Example 1
A wood-type golf club head group (Examples 1 to 3) composed of three types of wood-type golf club heads having the basic form shown in FIG. 1 was prototyped based on the specifications in Table 1 and the center-of-gravity distance was measured. For comparison, measurements were also made on a wood-type golf club head group outside the present invention. In each head group, the head volume was set to 320 cm ³ and the head mass was set to 188 g, which were substantially the same. The loft angle was 8 °, 9 °, and 10 ° in any set group.
Table 1 shows the head specifications and measurement results.
[0025]
[Table 1]

[0026]
As a result of the test, it was confirmed that the example embodiment can take a larger amount of change in the center-of-gravity distance than the conventional example, and can constitute a golf club head group applicable to a wider range of golfers.
[0027]
【The invention's effect】
As described above, according to the first aspect of the present invention, each head of the head group is located at the heel side of the head having the higher weight distribution ratio on the heel side as the loft angle α is larger. Therefore, the center of gravity of the head can be moved greatly following this. Therefore, the larger the loft angle α, the more weight can be distributed to the heel side, and the center of gravity of the head can be arranged closer to the heel side, which greatly improves the design freedom of the head. .
[0028]
Also, by regulating the loft angle of each wood type golf club head f head group and its center of gravity distance at a fixed relation, that loft angle is set to a large change in the centroid distance between the different heads I can .
[Brief description of the drawings]
FIG. 1 is a perspective view showing a head according to an embodiment.
FIGS. 2A to 2C show head outlines of a wood type golf club head group. FIG.
FIG. 3 is a front view showing a measurement state of a head.
FIG. 4 is a side view showing a measurement state of the head.
FIG. 5 is a plan view showing a measurement state of the head.
FIG. 6 is an enlarged view of a head outline.
7 is a cross-sectional view taken along the YY position of FIG. 6 showing another embodiment of the present invention.
8A and 8B show another embodiment of the present invention, in which FIG. 8A is a cross-sectional view taken along the line ZZ in FIG. 3, and FIG. 8B is a cross-sectional view taken along the line YY in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Wood type golf club head 2 Face surface 3 Face part 4 Crown part 5 Sole part 6 Side part 7 Neck part

Claims (2)

A wood-type golf club head group composed of a plurality of types of driver of the golf club head Chigae The filtrate shift angle,
The head volume of each golf club head is 250 cm ³ or more,
And in the head measurement state in which the shaft center line of the shaft insertion hole on which the shaft is mounted is arranged in the vertical plane and tilted at a specified lie angle and the face surface is placed on a horizontal plane in accordance with the specified face angle,
The head contour line projected on the horizontal plane is located at the heel side with the head having the largest loft angle located on the heel side, with the head most farthest from the vertical plane at the rear of the head.
The loft angle is 8 to 10 degrees, and the center of gravity distance that is the shortest length from the axial center line of the shaft insertion hole to the center of gravity of the head is 32.5 to 37.8 mm. When the loft angle is α ₁ ,..., Α _n (unit: °) in order from the smallest, and the center of gravity distance is L ₁ ,..., L _n (unit: mm), the following formula (1) must be satisfied. Wood type golf club head group characterized by
(L _n-1 −L _n ) / (α _n −α _n-1 )> 1.1 (unit: mm / °) (1) In the head contour line, a head length B that is a length along the vertical plane between a toe end point PT that forms the most toe side and a heel end point PH that forms the most heel side, the heel end point PH, and the head 2. The wood-type golf club head group according to claim 1, wherein a ratio (A / B) to a length A along the vertical plane with respect to the rearmost point P is 0.35 to 0.65 .

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