JP2007167622A - Golf club head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club head which is improved in controllability of ball hitting when weights are set on both a toe side and a heel side. <P>SOLUTION: The wood type golf club head is equipped with a hollow body and weight parts which are set to the toe side and the heel side inside the hollow body. When the golf club head is projected on a virtual plane in parallel with the face of the golf club in the direction of a virtual line perpendicular to the virtual plane, among four areas on the virtual plane virtually divided by the perpendicular line and the horizontal line passing through the projection point on the center of the face, the projection point of the weight part on the toe side is positioned in the lower side area of the toe side and the projection point of the weight part on the heel side is positioned in the upper side area of the heel side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wood-type golf club head such as a driver or a fairway wood.

  The current wood type golf club head employs a wide variety of materials such as a metal type formed of various metal materials such as titanium and stainless steel, and a composite type of a combination of a metal material and a resin material. Most of the wood-type golf club heads are constituted by a hollow body made of such a material, and the volume is increased.

  This type of golf club head has been proposed in which weights are respectively provided on the toe side and the heel side in order to adjust the weight distribution. By adjusting the weight distribution, for example, the position and range of the sweet spot can be adjusted. As this type of golf club head, for example, Patent Document 1 discloses a golf club head in which weights are provided on the toe side and the heel side close to the face surface.

JP-A-9-253241

  The weight is effective in weight distribution of the golf club head, but face rotation may be difficult depending on the arrangement. For this reason, it is difficult for golfers who actively perform face rotation during a swing to handle golf clubs, which may deteriorate the controllability of the hit ball. Moreover, if it is an average golfer, it becomes difficult to obtain a hook-type hit ball.

  Therefore, the present invention is to improve the controllability of the hit ball when weights are provided on the toe side and the heel side.

  According to the present invention, in the wood-type golf club head having a hollow body and weight portions provided on the toe side and the heel side inside the hollow body, the golf club head is connected to the face surface of the golf club head. When projected onto a parallel virtual plane in the direction of a virtual line perpendicular to the virtual plane, four lines on the virtual plane virtually divided by a vertical line and a horizontal line passing through the projection point at the center of the face surface. Among the regions, the projection point of the weight part on the toe side is located in a lower region on the toe side, and the projection point of the weight part on the heel side is located in an upper region on the heel side. A golf club head is provided.

  According to the present invention, when the weights are provided on the toe side and the heel side, the controllability of the hit ball can be improved.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a golf club head A according to an embodiment of the present invention, and is a view seen through a face surface 11. The golf club head A includes a hollow body 10, a toe side weight portion 20 disposed inside the hollow body 10, and a heel side weight portion 30. The golf club head A is a driver, but the present invention is applicable to other types of wood-type golf clubs such as fairway wood.

  The hollow body 10 includes a face surface 11 serving as a golf ball hitting surface, a crown portion 12 that forms an upper portion of the golf club head A, a sole portion 13 that forms a bottom portion of the golf club head A, and a crown portion 12 and a sole portion. 13, a back portion 14 and a side portion 15 that are continuous with each other, and a hosel portion 16 into which a shaft is inserted. The hollow body 10 is made of a metal material such as titanium, for example. The hollow body 10 can be manufactured, for example, by manufacturing a face member constituting the face surface 11 and a member constituting the remaining part, and then welding the face member to the member constituting the remaining part. it can.

  A cylindrical portion 13 a is formed integrally with the sole portion 13, an end portion of the cylindrical portion 13 a is integrally connected to the back portion 14, and an internal space of the cylindrical portion 13 a opens to the outer surface of the back portion 14. An elastic body is loaded in the tube portion. By loading the elastic body, the vibration of the golf club head A at the time of impact is suppressed, and the hit feeling is improved. Further, the elastic body serves as a weight on the back portion 14 side of the golf club head A and can achieve a deep center of gravity of the golf club head A. The deep center of gravity improves the ease of hitting the ball and the ease of holding the ball.

  The toe side weight portion 20 and the heel side weight portion 30 are provided to adjust the weight distribution of the golf club head A. In the present embodiment, the toe side weight portion 20 is disposed on the sole portion 13, and the heel side weight portion 30 is disposed on the crown portion 12. In the present embodiment, the weight parts 20 and 30 are fixed inside the hollow body 10 as separate members from the hollow body 10, but may be formed by partially increasing the thickness of the hollow body 10. . When separate members are used as in this embodiment, the weight portions 20 and 30 are made of, for example, copper, copper alloy (tungsten copper, etc.), stainless steel, tungsten, tungsten alloy (tungsten nickel, etc.), brass, etc. And the specific gravity can be 8 or more. In addition, when the weight parts 20 and 30 are separate members, examples of the fixing method include caulking, press fitting, welding, and screwing to the hollow body 10.

  In general, a golf club head has a lower center of gravity and is easier to hit. Accordingly, it is desirable that the weight portion 20 provided in the sole portion 13 is heavier than the weight portion 30 provided in the crown portion 12. Moreover, if the weight parts 20 and 30 are made heavy, the total weight of the golf club head A will become heavy. Therefore, it is desirable that the total weight of the weight parts 20 and 30 is in the range of 10 g to 60 g.

  Next, the arrangement | positioning site | part of the weight parts 20 and 30 is demonstrated. FIG. 2 (a) is an explanatory view of an arrangement site of the weight portions 20 and 30. FIG. First, as shown in FIG. 2A, a case where the golf club head A is projected onto the virtual plane S parallel to the face surface 11 of the golf club head A in the direction of the virtual line VL perpendicular to the virtual plane S. Think. FIG. 2B is an explanatory diagram of a virtual plane S on which the golf club head A is projected.

  As shown in FIG. 2B, the vertical plane Lv and the horizontal line Lh that pass through the projection point of the center CF of the face surface 11 through the virtual plane S (vertical lines and horizontal lines when the virtual plane S is set up vertically) It is virtually divided into four areas I to IV. Of the four regions I to IV, the projection point (projected image) of the toe side weight portion 20 is located in the region III, which is the lower region of the toe side, and the projection point of the heel side weight portion 30 ( The weight portions 20 and 30 are arranged so that the projected image) is located in a region I that is an upper region on the heel side. The effect | action which this arrangement position brings is demonstrated.

  Generally, golf club heads tend to be closer to the heel side due to the presence of the hosel part, and the principal axis of inertia is inclined from the vertical direction (heel-crown direction) to the hosel part side due to the presence of the hosel part. It will be a thing. If the main spindle direction of inertia hardly changes depending on the presence or absence of the weight parts such as the weight parts 20 and 30, if the weight part is provided at a position far from the main spindle of inertia, the golf club head is difficult to rotate around the main axis of inertia. The face rotation becomes difficult (heavy). On the contrary, if it is provided at a close position, it is possible to reduce the difficulty of rotating the golf club head around the principal axis of inertia due to the provision of the weight portion.

  2A and 2B schematically show the position of the center of gravity (indicated by Z in FIG. 2A) and the principal axis of inertia Ma of the golf club head A of the present embodiment. The inertia main axis Ma is inclined toward the hosel portion 16 side. Thus, by arranging the weight parts 20 and 30 in the above-described arrangement, the weight parts 20 and 30 are arranged in the vicinity of the inertia main axis Ma, so that the golf club head is difficult to rotate around the inertia main axis Ma. Can be reduced.

  That is, among the four regions shown in FIG. 2B, if the weights 20 and 30 are disposed in the regions I and III, these are disposed closer to the spindle Ma than in the regions II and IV. Provided to facilitate face rotation. This arrangement facilitates the face rotation when it is desired to consciously perform the face rotation, thereby improving the controllability of the hit ball.

  The projected point of the center of gravity Z of the golf club head A with respect to the virtual plane S is 6 mm with the center point being 3 mm above the projected point of the center CF of the face surface 11 as shown in FIG. It is desirable to be located in the region V on the virtual plane S, which is a square of 6 mm. The average golfer tends to align the hit point with the center CF of the face surface 11, but if the projection point on the virtual plane S is in the region V (that is, the position of the center of gravity on the face surface 11 is slightly smaller than the center CF). If it is above), the longest flight distance can be obtained.

  In the present invention, the center CF of the face surface 11 is determined as follows. 3A and 3B are explanatory diagrams of the center CF. The center CF is first aligned with the face surface 11 so as to be perpendicular to the virtual target direction, and then the golf club is placed on the horizontal contact surface GL at the lie angle θ defined for the golf club having the golf club head A. Sole head A. The lie angle θ is an angle formed between the shaft axis Sa and the ground contact surface GL. If the lie angle θ is not defined for the golf club, the lie angle θ is uniformly 57 °.

  In this state, the lowest point BF of the face surface 11 is determined. If the lowest point is over a certain area, it will be the center. Next, the upper edge point of the face surface 11 above the lowermost point BF is set as the uppermost point TF. A position above the lowermost point BF corresponding to 1/2 of the height difference H between the lowermost point BF and the uppermost point TF is defined as the center CF.

  A golf club trial run using the examples of the present invention and Comparative Examples 1 and 2 was conducted. FIG. 4 is a perspective view of the golf club head of Comparative Example 1, and shows the arrangement site of the weight part 120 on the toe side and the weight part 130 on the heel side. In FIG. 2B, the golf club head of Comparative Example 1 has a toe-side weight portion 120 disposed in the region II and a heel-side weight portion 130 disposed in the region IV, and the weight portion 120 is disposed on the crown portion. The weight part 130 is fixed to the sole part. The golf club head of Comparative Example 2 has no toe side and heel side weights.

  FIG. 6A shows the specifications of Examples and Comparative Examples 1 and 2. FIGS. 5A and 5B are explanatory diagrams of some of the parameters shown in FIG. DXG and DYG indicate the distance between the center of the face surface and the projected point Z ′ projected onto the face surface in the direction perpendicular to the center of gravity Z of the golf club head. DXG is the distance in the horizontal direction, DYG is Vertical distance (height difference). ZG is the shortest distance between the center of gravity Z of the golf club head and the face surface. HG is the height from the ground contact surface GL to the projection point Z ′, and HGR is the height from the ground contact surface GL to the center of gravity Z. IX is the moment of inertia around the horizontal axis of the golf club head, and IY is the moment of inertia around the vertical axis.

  The test was made by a professional golfer. FIG. 6B shows the test hit results. In FIG. 6B, “carry” is the distance from the bat to the ball drop point, and “flying distance” is the total distance obtained by adding the carry and the distance rolled from the drop point. The minus (−) sign of “side spin amount” indicates the rotation direction of the ball, and minus indicates the hook rotation. “Blur” indicates the shortest distance between the target direction of the hit ball and the drop point of the ball. In this test hit, the ball fell to the right of the target direction.

  Looking at the test hit results, there is no significant difference in the “head speed”, “ball initial speed”, and “launch angle” between the examples and comparative examples 1 and 2. In the “side spin amount”, the example is the smallest and the hook is rotated. In the “carry”, “blur”, and “flying distance”, the example exceeds the comparative examples 1 and 2.

  The professional golfer who performed the test hit evaluated that the golf club head of the example had a better grip of the ball than Comparative Examples 1 and 2 without feeling the weight of the head or the delay of the head.

  When the specifications of Example and Comparative Examples 1 and 2 are compared, there is no noticeable difference between Example and Comparative Example 1. However, it is considered that the results of the trial hitting results in the example were better than those in Comparative Example 1 depending on the arrangement of the weight portions on the toe side and the heel side. Considering the evaluation of the professional golfer who performed the test shot, it is considered that the face control was easier for the golf club using the golf club head of the example than the golf club using the golf club head of Comparative Examples 1 and 2.

FIG. 1 is a perspective view of a golf club head A according to an embodiment of the present invention. (A) is explanatory drawing of the arrangement | positioning site | part of the weight parts 20 and 30, (b) is explanatory drawing of the virtual plane S where the golf club head A was projected. (A) And (b) is explanatory drawing of center CF of the face surface 11. FIG. 3 is a perspective view of a golf club head of Comparative Example 1. FIG. (A) And (b) is explanatory drawing of a part of parameter shown to Fig.6 (a). (A) shows the specifications of Examples and Comparative Examples 1 and 2, and (b) shows the test hit results.

Explanation of symbols

A Golf club head 10 Hollow body 20, 30 Weight part

Claims (4)

In a wood-type golf club head having a hollow body and weight portions provided on the toe side and the heel side in the hollow body,
When the golf club head is projected on a virtual plane parallel to the face surface of the golf club head in the direction of a virtual line perpendicular to the virtual plane, a vertical line and a horizontal line passing through a projection point at the center of the face surface The projection point of the weight part on the toe side is located in the lower region of the toe side, and the projection point of the weight part on the heel side is the heel A golf club head, wherein the golf club head is located in an upper region on the side.   The golf club head according to claim 1, wherein the weight portion on the toe side is heavier than the weight portion on the heel side.   2. The golf club head according to claim 1, wherein a total weight of the weight portions on the toe side and the heel side is within a range of 10 g to 60 g.   The projected point of the center of gravity of the golf club head is a 6 mm × 6 mm square centered at a point 3 mm above the projected point at the center of the face surface, and in a different area on the virtual plane. The golf club head according to claim 1, wherein the golf club head is located.

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