JP2020103585A - Golf club head - Google Patents

Abstract

To achieve high resilience, low sweet spot and large right and left moment of inertia.SOLUTION: A golf club head 1 having a hollow part in the inside includes a face part 2 for striking a ball, and a sole part 4 extending from the face part 2 to the back of a head. A first weight part 10 is disposed on an inner surface 7 of the sole part 4 at a face part 2 side. The first weight part 10 projects to the face part side while extending upward from the inner surface 7 and not coming in contact with the face part 2. In a plane view of the sole part 4, a recess edge 12 recessed to the face part 2 side is provided in a rear edge 11 of the first weight part 10, in which the first weight part 10 and the inner surface 7 of the sole part 4 are connected at the head rear side. A head gravity center G is positioned at the head rear side of the recess edge 12.SELECTED DRAWING: Figure 4

Description

The present invention relates to a golf club head, and more particularly to a golf club head having a hollow portion inside.

Golf club heads with hollow parts inside, especially fairway woods and hybrid golf club heads called hybrids, which often hit the ball directly on the ground, have a low sweet spot in order to obtain a great flight distance. Is required.

The following Patent Document 1 describes a golf club head suitable as a fairway wood or a utility (hybrid). In this golf club head, a weight portion is provided on the sole portion facing the hollow portion. The weight portion is close to the face portion and extends in the toe/heel direction. In such a golf club head, the center of gravity (sweet spot) on the face surface and the hitting point of the ball are made closer by lowering the center of gravity, and the amount of deflection at the portion of the sole portion close to the face portion is secured, We expect the effect of increasing the distance.

Patent No. 5842904

In the golf club head of Patent Document 1, the weight portion is fixed while being floated from the sole portion. Therefore, in the above golf club head, the center of gravity of the weight portion is likely to be high, and there is room for further improvement to provide a low sweet spot.

A golf club head suitable as a fairway wood or hybrid has a smaller head volume than a driver or the like. Therefore, the moment of inertia about the vertical axis passing through the center of gravity of the golf club head (left and right moments of inertia) tends to be small. In such a golf club head, the direction of the golf club head is apt to change when hitting the ball at a position displaced to the left and right from the sweet spot, and there is room for further improvement in the directionality of the hit ball.

The present invention has been devised in view of the above circumstances, and is a golf club head that can realize high resilience, a low sweet spot, and large left and right moments of inertia, particularly golf suitable for fairway woods and hybrids. The main challenge is to provide a club head.

The present invention is a golf club head having a hollow portion inside, the golf club head having a face portion for hitting a ball and a sole portion extending from the face portion to the rear of the head, and the hollow portion side of the sole portion. An inner surface facing toward the face portion, a first weight portion is provided on the side of the face portion, and the first weight portion extends upward from the inner surface to the face portion side without contacting the face portion. A recessed edge that is recessed toward the face portion is provided at the rear edge of the first weight portion that protrudes and that connects the first weight portion and the inner surface of the sole portion on the head rear side in a plan view of the head. The golf club head is provided, in which the center of gravity of the head is located on the rear side of the head at the edge of the recess.

In another aspect of the present invention, in a plan view of the sole portion, the center of gravity of the head is located within a concave region surrounded by the concave edge and a straight line connecting both ends of the concave edge in the toe-heel direction. Is also good.

In another aspect of the present invention, in the plan view of the sole portion, the recess edge may have an arc shape having a center on the head rear side of the recess edge.

In another aspect of the present invention, in the head front-rear direction between a leading edge and a leading edge of the first weight portion where the first weight portion and the inner surface of the sole portion are connected on the face portion side. The distance (A) may be 14 to 23 (mm).

In another aspect of the present invention, a second weight part may be provided on the inner surface of the sole part, on the head rear side with respect to the center of gravity of the head.

In another aspect of the present invention, in a standard state in which the golf club head is placed on a horizontal plane at a prescribed lie angle and loft angle, the second weight part is a region (B) of 6 (mm) or less from the horizontal plane. ).

In another aspect of the present invention, in a plan view of the sole portion, a front edge of the second weight portion where the second weight portion and the inner surface of the sole portion are connected on the side of the center of gravity of the head is the head. It may be curved in an arc shape having its center on the side of the center of gravity.

In another aspect of the present invention, a third weight part may be provided on the inner surface of the sole part on the toe side of the center of gravity of the head.

In another aspect of the present invention, in a plan view of the sole portion, an inner edge of the third weight portion where the third weight portion and the inner surface of the sole portion are connected on the side of the center of gravity of the head has a center of gravity of the head. It may be curved in an arc having a center on the side.

In another aspect of the present invention, a fourth weight portion may be provided on the inner surface of the sole portion on the heel side of the center of gravity of the head.

In another aspect of the present invention, in a plan view of the sole portion, an inner edge of the fourth weight portion where the fourth weight portion and the inner surface of the sole portion are connected on the side of the center of gravity of the head has a center of gravity of the head. It may be curved in an arc having a center on the side.

In another aspect of the present invention, the depth of the center of gravity may be 29 to 32 (mm).

In another aspect of the present invention, the height of the center of gravity may be 11 to 16 (mm).

In another aspect of the present invention, in a standard state in which the golf club head is placed on a horizontal plane at a specified lie angle and loft angle, the height of the sweet spot is in the range of 17 to 22 (mm) from the horizontal plane. You may do it.

In another aspect of the present invention, when the golf club head is placed on a horizontal plane at a prescribed lie angle and loft angle, a left and right moment of inertia about a vertical axis passing through the center of gravity of the head is 2200. It may be up to 2800 (g·cm ² ).

In the golf club head of the present invention, the first weight portion is provided on the inner surface of the sole portion on the face portion side. The first weight portion extends upward from the inner surface and protrudes toward the face portion without contacting the face portion. Since such a first weight portion is located away from the face portion, the thickness of the sole portion near the face portion can be reduced. Therefore, at the time of hitting the ball, the portion of the sole portion near the face portion can be easily bent, and the golf club head can be made highly repulsive.

Further, since the first weight portion extends so as to project from the inner surface of the sole portion toward the face portion side, a large weight can be arranged on the face portion side of the golf club head, and the center of gravity of the head is made shallow (close to the face portion). )be able to. Therefore, the golf club head of the present invention provides a low sweet spot. In such a golf club head, when hitting a ball directly placed on the ground, the hit position and the sweet spot are close to each other, so that high resilience and low spin of a hit ball can be achieved and a flight distance can be increased. it can.

Further, in a plan view of the sole portion 4, a rear edge of the first weight portion where the first weight portion and the inner surface of the sole portion are connected on the head rear side has a concave edge recessed toward the face portion side. Is provided, and the center of gravity of the head is located on the rear side of the head at the edge of the recess. Therefore, in the golf club head of the present invention, since the large weight of the first weight portion is distributed to the position away from the center of gravity of the head, a large left and right moment of inertia can be obtained and the directionality of the hit ball can be improved. ..

1 is a perspective view of a golf club head showing one embodiment of the present invention. 2 is a plan view of the golf club head of FIG. 1. FIG. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. FIG. 5 is a perspective view of FIG. 4. (A)-(C) is a top view of the sole part which shows other embodiment.

Embodiments of the present invention will be described below with reference to the drawings. Throughout all the embodiments, the same members or portions are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a perspective view of a golf club head (hereinafter, may be simply referred to as “head”) 1 of the present embodiment, FIG. 2 is a plan view thereof, and FIG. 3 is a sectional view taken along line III-III of FIG. Show.

[Standard condition]
1 to 3, the head 1 is in the reference state. Unless otherwise specified, the head 1 is assumed to be in this reference state.

The reference state is a state in which the head 1 is placed on the horizontal plane HP at a lie angle (not shown) and a loft angle α (shown in FIG. 3) determined for the head 1. More specifically, in the reference state, as shown in FIG. 2, the face 2a of the head 1 is in a state in which the shaft axis center line CL of the head 1 is arranged in the reference vertical plane VP and inclined to the lie angle. Is held at the loft angle α (shown in FIG. 3). The shaft axis center line CL is defined by the shaft center line of the shaft insertion hole 6a formed in the hosel portion 6 of the head 1.

[Head coordinate system]
In this specification, the head 1 is associated with an xyz coordinate system. The x-axis is an axis orthogonal to the reference vertical plane VP and parallel to the horizontal plane HP, the y-axis is an axis parallel to both the reference vertical plane VP and the horizontal plane HP, and the z-axis is both the x-axis and the y-axis. The axes are orthogonal. Regarding the head 1, the direction along the x-axis is defined as the head front-rear direction, the direction along the y-axis is defined as the toe-heel direction, and the direction along the z-axis is defined as the head up-down direction.

[Example of basic form of head]
The head 1 of this embodiment is configured to have a hollow portion i inside. In a preferred mode, the head 1 of this embodiment is configured as a golf club head suitable for hitting when the ball is directly placed on the ground. Examples of such include fairway woods or hybrids. These heads typically have a loft angle α of 15 degrees or more, a head volume of about 100 to 200 cc, and a head weight of about 200 to 240 g.

Fairway woods include, for example, spoons (#3), buffy (#4), creeks (#5), and other woods (#7, #9).

Hybrids are known in the art as having, for example, an intermediate shape between a wood type and an iron head.

The head 1 includes a face portion 2, a crown portion 3, a sole portion 4, a side portion 5, etc. so as to define a hollow portion i.

The hollow portion i may be, for example, a space as it is, or a gel agent for weight adjustment or the like may be arranged in a part thereof.

The face portion 2 is formed on the front side of the head 1 for hitting a ball, and has a face 2a which is a surface that comes into direct contact with the ball. Although not shown, the face 2a is provided with a plurality of grooves called face lines extending in the toe-heel direction.

The crown portion 3 extends from the upper side of the face portion 2 to the rear of the head to form a head upper surface. The hosel portion 6 described above is provided on the heel side of the crown portion 3. The hosel portion 6 has a shaft insertion hole 6a for fixing a golf club shaft (not shown).

The sole portion 4 extends from the lower side of the face portion 2 to the rear of the head to form a bottom surface of the head.

The side part 5 connects between the crown part 3 and the sole part 4. The toe side and the heel side of the side portion 5 are connected to the toe side and the heel side of the face portion 2, respectively.

In this embodiment, the face portion 2, the crown portion 3, the sole portion 4, and the side portion 5 are made of, for example, a metal material. As the metal material, for example, stainless steel, maraging steel, titanium alloy, magnesium alloy or aluminum alloy is suitable. In another aspect, a part of the head 1 (for example, the crown portion 3) may be made of a non-metal material such as fiber reinforced resin.

4 is a sectional view taken along line IV-IV of FIG. 3, and FIG. 5 is a perspective view of FIG. As shown in FIGS. 3 to 5, a first weight portion 10 is provided on the inner surface 7 of the sole portion 4 facing the hollow portion i side.

[First weight part]
The first weight portion 10 is provided on the face portion 2 side of the inner surface 7 of the sole portion 4 in the head front-rear direction. As is clear from the cross section shown in FIG. 3, the first weight portion 10 extends upward from the inner surface 7 of the sole portion 4 and projects toward the face portion 2 without contacting the face portion 2. .. More specifically, the first weight portion 10 of the present embodiment extends upward from the inner surface 7 of the sole portion 4 at a position spaced from the face portion 2 to the rear of the head, and then obliquely moves toward the face portion 2. Is a raised object that extends to the end and is interrupted at a position where the tip does not contact the face portion 2.

The first weight portion 10 is located away from the face portion 2. Therefore, the thickness of the portion of the sole portion 4 near the face portion 2 (that is, the sole front portion 4a of the sole portion 4 which is sandwiched between the face portion 2 and the first weight portion 10) can be reduced. .. As a result, at the time of hitting the ball, the portion of the sole portion 4 near the face portion 2 is easily bent, and the head 1 can be highly repulsed.

Further, since the first weight portion 10 extends obliquely from the inner surface 7 of the sole portion 4 toward the face portion 2, a large weight can be arranged on the face portion 2 side of the head 1 and the center of gravity of the head is shallowed (face). It can be closer to part 2). Therefore, the head 1 of this embodiment can provide a low sweet spot SS. When hitting a ball directly placed on the ground, such a head 1 achieves high resilience and low spin of a hit ball and increases flight distance because the hit position and the sweet spot SS are close to each other. it can. The sweet spot SS is the intersection of the perpendicular line N and the face 2a when the perpendicular line N is drawn from the center of gravity G of the head to the face 2a.

In a preferred embodiment, in the sole portion 4, the periphery of the first weight portion 10 is formed with a thickness t that is sufficiently smaller than that of the first weight portion 10. As a result, a larger weight is concentratedly distributed to the first weight portion 10, and the above-mentioned effect is enhanced.

The thickness t of the sole portion 4 around the first weight portion 10 is not particularly limited, but is, for example, 2.0 mm or less, and more preferably 1.8 mm or less. In order to maintain the durability of the sole portion 4, the thickness t of the sole portion 4 is preferably 0.6 mm or more, for example.

The height of the center of gravity G of the head and the position in the front-rear direction of the head can be adjusted by changing the volume or cross-sectional shape of the first weight portion 10. For example, the height of the center of gravity, which is the height from the horizontal plane HP to the center of gravity G of the head, is preferably 11 to 16 mm. The depth of the center of gravity, which is the distance from the leading edge Le of the head 1 to the center of gravity G of the head in the front-rear direction of the head, is preferably 29 to 32 mm. Further, the height of the sweet spot SS from the horizontal plane HP is, for example, 17 to 22 mm. As a result, when hitting a ball directly placed on the ground, the hitting position and the sweet spot SS become closer to each other, and the flight distance can be increased.

As shown in FIG. 4, the first weight portion 10 extends in the toe-heel direction. In the first weight portion 10 of the present embodiment, the toe side end 10a is located on the toe side of the center of gravity G of the head, and the heel side end 10b is located on the heel side of the center of gravity G of the head. Further, the toe side end 10a of the first weight part 10 does not reach, for example, the side part 5 and terminates before this, and the heel side end 10b of the first weight part 10 is connected to the hosel part 6, for example. It In such a mode, the center of gravity can be brought closer to the heel side. This improves the grip of the ball when hit.

[The trailing edge of the first weight part]
The first weight portion 10 has a trailing edge 11 that defines the edge on the rear side of the head. The rear edge 11 is a connection portion on the rear side of the head between the first weight portion 10 and the inner surface 7 of the sole portion 4. In other words, in the cross section of the first weight portion 10 parallel to FIG. The edge 11 defines the rear end of the first weight portion 10 in the front-rear direction of the head.

As is apparent from FIG. 4, the first weight portion 10 is located closer to the head front side than the trailing edge 11. In a plan view of the sole portion 4, a recess edge 12 that is recessed toward the face portion 2 is provided on a rear edge 11 of the first weight portion 10, and a head center of gravity G is provided on the head rear side of the recess edge 12. To position. In such a mode, since the large weight of the first weight portion 10 is distributed to the position away from the center of gravity G of the head, the head 1 has a large moment of inertia on the left and right and can improve the directionality of the hit ball. it can.

In a preferred mode, in the plan view of the sole portion 4, the recess edge 12 has an arc shape having a center on the head rear side of the recess edge 12. In such a mode, the above-mentioned weight distribution effect can be optimized and the above-mentioned action can be further enhanced. The "arc shape" is not limited to the case of a single arc, but may be a compound arc in which a plurality of arcs are connected (the same applies hereinafter). Particularly preferably, the recess edge 12 may be an arc centered on the projected center of gravity PG (shown in FIG. 5) obtained by projecting the center of gravity G of the head onto the inner surface 7 of the sole portion 4. The radius of curvature of the arc is not particularly limited, but is preferably 20 mm±5 mm, for example.

In a preferred mode, the center of gravity G of the head may be located in a recess region surrounded by the recess edge 12 and a straight line S connecting both ends of the recess edge 12 in the toe-heel direction in a plan view. As a result, the left and right inertia moments can be increased more reliably while the head center of gravity G is located on the front side (face side). In a preferred mode, the center of gravity G of the head is preferably 10 mm±2 mm from the straight line S to the face portion 2 side.

In a preferred embodiment, the left and right moments of inertia, which are moments of inertia about a vertical axis passing through the center of gravity G of the head, are set to 2200 to 2800 (g·cm ² ). This more reliably improves the directionality of the hit ball.

The rear edge 11 of the first weight portion 10 of the present embodiment is provided with, for example, a toe side edge 13 and a heel side edge 14 that extend substantially along the toe-heel direction on the toe side and the heel side of the recess edge 12. Has been. Here, the term “substantially” allows the toe side edge 13 and the heel side edge 14 to incline within an angle range of 10 degrees or less with respect to the toe-heel direction. Such a toe side edge 13 and a heel side edge 14 are suitable for distributing more weight to the toe side and heel side of the head 1, and help to further increase the left and right moments of inertia.

[Front edge of the first weight part]
The first weight portion 10 has a front edge 15 that defines an edge on the front side of the head. The front edge 15 of the first weight portion 10 is a connecting portion on the front side of the head between the first weight portion 10 and the inner surface 7 of the sole portion 4. In the present embodiment, the front edge 15 extends substantially along the toe-heel direction of the head 1 as shown by a broken line in FIG. Here, the term “substantially” allows the front edge 15 to be inclined within an angle range of 10 degrees or less with respect to the toe-heel direction.

In a preferred embodiment, as shown in FIG. 3, the distance A in the head front-rear direction between the front edge 15 of the first weight portion 10 and the leading edge Le of the head 1 is, for example, 14 to 23 mm, more preferably 16 to 21 mm. In such a mode, while the center of gravity G of the head is moved to the face portion 2 side, the sole front portion 4a between the face portion 2 and the first weight portion 10 is formed sufficiently large, and at the time of hitting the ball, the sole front portion 4a is formed. 4a can be largely deflected to further increase the resilience. When the distance A changes in the toe/heel direction, it is desirable that the minimum distance satisfies the above preferable numerical value range.

[Manufacturing Method of First Part by Weight]
The first weight portion 10 may be integrally formed with the sole portion 4 in advance by, for example, casting or cutting. In this case, the first weight portion 10 is made of the same metal material as the sole portion 4. In another aspect, the first weight portion 10 may be prepared as a member independent of the sole portion 4 and fixed to the inner surface 7 of the sole portion 4 by welding or screw means. In this case, the first weight portion 10 may be formed of a metal material (high specific gravity metal material) different from that of the sole portion 4.

[Modification of the first weight part]
FIG. 6 shows a plan view of the inner surface 7 of the sole portion 4 as a modified example of the first weight portion 10. As shown in FIG. 6(A), the rear edge 11 of the first weight portion 10 may be entirely formed by the recess edge 12 from the toe side to the heel side. Further, as shown in FIGS. 6B and 6C, the recess edge 12 may be a combination of straight lines. That is, in FIG. 6(B), the recess edge 12 is a V-shaped polygonal line that defines a triangular recess, and in FIG. 6(C), the recess edge 12 has a quadrangular (trapezoidal) shape. It may be configured by a polygonal line that defines the recess.

Next, a modified example of the sole portion 4 will be described.

[Second weight part]
As shown in FIG. 4, a second weight portion 20 may be provided on the inner surface 7 of the sole portion 4 on the head rear side with respect to the center of gravity G of the head. The second weight portion 20 concentrates a large weight behind the sole portion 4 to increase the depth of the center of gravity of the head 1 while maintaining the head center of gravity G low. In addition, the second weight portion 20 helps to further increase the left and right moments of inertia.

In the present embodiment, the second weight portion 20 is formed of a thick portion that is locally thicker than the thickness t of the sole portion 4. The thickness of the second weight portion 20 is not particularly limited, but is preferably 1.4 mm or more, more preferably 1.8 mm or more. In the sole portion 4, the periphery of the second weight portion 20 is formed with the thickness t that is sufficiently smaller than the second weight portion 20 (see FIG. 3 ). As a result, a larger weight is concentratedly distributed to the second weight section 20, and the above-mentioned effect is enhanced. In another aspect, the second weight portion 20 may be made of a metal material different from that of the sole portion 4.

In a preferred embodiment, as shown in FIG. 3, the second weight portion 20 is arranged within a region (B) that is 6 (mm) or less from the horizontal plane HP. Generally, the sole portion 4 has a shape that curves upward toward the rear of the head. Therefore, if the second weight portion 20 is arranged closer to the rear side of the head, the center of gravity G of the head may be increased. However, by limiting the upper limit of the height of the second weight portion 20 as described above, Such a defect is prevented.

In a preferred embodiment, as shown in FIG. 4, in plan view of the sole portion 4, the front edge of the second weight portion 20 in which the second weight portion 20 and the inner surface 7 of the sole portion 4 are connected on the side of the center of gravity G of the head. 22 is preferably curved in an arc shape having a center on the side of the center of gravity G of the head. In such a mode, the weight of the second weight portion 20 can be arranged at a position far from the center of gravity G of the head, the above-described weight distribution effect can be optimized, and the left and right moments of inertia can be further increased.

In the present embodiment, in the plan view of the sole portion 4, the rear edge 24 of the second weight portion 20 in which the second weight portion 20 and the inner surface 7 of the sole portion 4 are connected on the side of the outer contour line of the head also has the head gravity center G. It is curved in an arc shape having a center on the side. More specifically, the rear edge 24 of the second weight portion 20 extends along the outer contour line of the head in a plan view of the head. As a result, the second weight portion 20 can effectively distribute a large weight to the toe side peripheral portion of the sole portion 4.

[Third part by weight]
As shown in FIG. 4, on the inner surface 7 of the sole portion 4, a third weight portion 30 may be provided on the toe side of the center of gravity G of the head. The third weight portion 30 concentrates a large weight on the toe side of the sole portion 4, and helps to further increase the left and right moments of inertia while maintaining the head center of gravity G low.

In the present embodiment, the third weight portion 30 is formed of a thick portion that is locally thicker than the thickness t of the sole portion 4. The thickness of the third weight part 30 is not particularly limited, but is preferably 1.0 mm or more, more preferably 1.3 mm or more. In the sole portion 4, the periphery of the third weight portion 30 is formed with the thickness t which is sufficiently smaller than the third weight portion 30. Thereby, a larger weight is concentratedly distributed to the third weight portion 30, and the above-mentioned effect is enhanced. In another aspect, the third weight portion 30 may be made of a metal material different from that of the sole portion 4.

The third weight part 30 is provided, for example, at a distance from the first weight part 10 and the second weight part 20. In other words, the portion having the small thickness t is interposed between the third weight portion 30 and the first weight portion 10 and between the third weight portion 30 and the second weight portion 20. ing. As a result, the rigidity of the sole portion 4 is suppressed from being excessively increased, and deterioration of the resilience performance is suppressed.

In a preferred aspect, in a plan view of the sole portion 4, the inner edge 32 of the third weight portion 30 in which the third weight portion 30 and the inner surface 7 of the sole portion 4 are connected on the head gravity center G side is centered on the head gravity center G side. It is better to bend it in an arc shape having In such a mode, the weight of the third weight portion 30 can be arranged at a position far from the center of gravity G of the head, the above-described weight distribution effect can be optimized, and the left and right moments of inertia can be further increased.

In the present embodiment, in the plan view of the sole portion 4, the outer edge 34 of the third weight portion 30 in which the third weight portion 30 and the inner surface 7 of the sole portion 4 are connected on the side of the outer contour line of the head also includes the head gravity center G. It is curved in an arc shape having a center on the side. More specifically, the outer edge 34 of the third weight portion 30 extends along the outline of the head. As a result, the third weight portion 30 can effectively distribute a large weight to the toe side peripheral portion of the sole portion 4.

[Fourth part by weight]
As shown in FIG. 4, on the inner surface 7 of the sole portion 4, a fourth weight portion 40 may be provided on the heel side of the center of gravity G of the head. The fourth weight portion 40 concentrates a large weight on the heel side of the sole portion 4, and helps to further increase the left and right moments of inertia while keeping the center of gravity G of the head low.

In the present embodiment, the fourth weight portion 40 is formed of a thick wall portion locally thicker than the thickness t of the sole portion 4. The thickness of the fourth weight portion 40 is not particularly limited, but is preferably 1.2 mm or more, more preferably 1.5 mm or more. In the sole portion 4, the periphery of the fourth weight portion 40 is formed with the thickness t which is sufficiently smaller than that of the fourth weight portion 40. Thereby, a larger weight is concentratedly distributed to the fourth weight portion 40, and the above-mentioned effect is enhanced. In another aspect, the fourth weight portion 40 may be made of a metal material different from that of the sole portion 4.

The fourth weight portion 40 is provided, for example, at a distance from the first weight portion 10 and the second weight portion 20. In other words, the portion having the small thickness t is interposed between the fourth weight portion 40 and the first weight portion 10 and between the fourth weight portion 40 and the second weight portion 20. ing. Thereby, as described above, the rigidity of the sole portion 4 is suppressed from being excessively increased, and the deterioration of the resilience performance is suppressed.

In a preferred mode, in a plan view of the sole portion 4, the inner edge 42 of the fourth weight portion 40, which connects the fourth weight portion 40 and the inner surface 7 of the sole portion 4 on the head gravity center G side, is centered on the head gravity center G side. It is better to bend it in an arc shape having In such a mode, the weight of the fourth weight portion 40 can be arranged at a position distant from the center of gravity G of the head, the above-described weight distribution effect can be optimized, and the left and right moments of inertia can be further increased.

In the present embodiment, in the plan view of the sole portion 4, the outer edge 44 of the fourth weight portion 40 in which the fourth weight portion 40 and the inner surface 7 of the sole portion 4 are connected on the head outer contour line side is also the head center of gravity G side. It is curved in an arc shape with its center at. More specifically, the outer edge 44 of the fourth weight portion 40 extends along the outer contour line of the head. Thereby, the fourth weight portion 40 can effectively distribute a large weight to the heel side peripheral portion of the sole portion 4.

[Combination of parts by weight]
In the embodiment of FIG. 4, the sole portion 4 is provided with the second weight portion 20, the third weight portion 30, and the fourth weight portion 40 in addition to the first weight portion 10. However, it goes without saying that the second weight part 20, the third weight part 30, and the fourth weight part 40 are optional elements and may be omitted. Moreover, as for the second weight part 20, the third weight part 30, and the fourth weight part 40, only one of them may be applied, or two or more may be applied in various combinations. For example, the third weight part 30 is preferably larger than the second weight part 20 and the fourth weight part 40. As a result, more weight is distributed to the position on the side opposite to the hosel portion 6, and the weight balance of the head is optimized.

Although some embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments described above, and various modifications may be made.

The hollow fairway wood (#3) shown in FIGS. 1 to 5 was prototyped according to the specifications in Table 1 and the performance of the head was tested.

In addition, as a comparative example, the trailing edge of the first weight portion substantially extends in the toe-heel direction and does not have a recess edge (the length of the first weight in the toe-heel direction is adjusted, and its volume is adjusted). Was the same as the example). Throughout the examples and comparative examples, each head has the same structure except for the trailing edge of the first weight portion. The height of the sweet spot, the height of the center of gravity, the depth of the center of gravity, and the left and right moments of inertia were measured for the examples and comparative examples. Table 1 shows the test results and the like.

As a result of the test, it was confirmed that the head of the example realized a low sweet spot and a large moment of inertia of right and left. Further, since the ball has a low sweet spot, the sweet spot and the hitting position are close to each other when hitting a ball directly placed on the ground, and it is easily inferred that high resilience is obtained.

DESCRIPTION OF SYMBOLS 1 golf club head 2 face part 2a face 4 sole part 7 inner surface of sole part 10 first weight part 11 first weight part rear edge 12 recess edge 20 second weight part 22 second weight part front edge 30 third weight Part 32 Inner edge of third weight part 40 Fourth weight part 42 Inner edge of fourth weight part SS Sweet spot i Hollow part

Claims (15)

A golf club head having a hollow portion inside,
A face portion for hitting the ball, and a sole portion extending from the face portion to the rear of the head,
On the inner surface of the sole portion facing the hollow portion side, the first weight portion is provided on the face portion side,
The first weight portion extends upward from the inner surface and projects toward the face portion without contacting the face portion,
In a plan view of the sole portion, a recess edge that is recessed toward the face portion is provided at a rear edge of the first weight portion where the first weight portion and an inner surface of the sole portion are connected on the head rear side. Has been
The center of gravity of the head is located on the head rear side of the edge of the recess,
Golf club head. The golf club head according to claim 1, wherein, in a plan view of the sole portion, the recess edge has an arc shape having a center on a head rear side of the recess edge. 3. The plan view of the sole portion, the center of gravity of the head is located in a concave region surrounded by the concave edge and a straight line connecting both ends of the concave edge in the toe-heel direction. Golf club head. The distance (A) in the front-rear direction of the head between the leading edge and the leading edge of the first weight portion where the first weight portion and the inner surface of the sole portion are connected on the face portion side is 14 to The golf club head according to any one of claims 1 to 3, which has a size of 23 (mm). The golf club head according to claim 1, wherein a second weight portion is provided on the inner surface of the sole portion on the head rear side with respect to the center of gravity of the head. In a standard state in which the golf club head is placed on a horizontal plane at a specified lie angle and loft angle, the second weight part is arranged within a region (B) of 6 (mm) or less from the horizontal plane. The golf club head according to claim 5. In a plan view of the sole portion, a front edge of the second weight portion, which connects the second weight portion and the inner surface of the sole portion on the side of the center of gravity of the head, has an arc shape having a center on the side of the center of gravity of the head. The golf club head according to claim 5, which is curved. The golf club head according to claim 1, wherein a third weight portion is provided on the inner surface of the sole portion on the toe side of the center of gravity of the head. In a plan view of the sole portion, an inner edge of the third weight portion, which connects the third weight portion and the inner surface of the sole portion on the head gravity center side, has an arc shape having a center on the head gravity center side. The golf club head of claim 8, wherein the golf club head is curved. The golf club head according to claim 1, wherein a fourth weight portion is provided on the inner surface of the sole portion on the heel side of the center of gravity of the head. In a plan view of the sole portion, an inner edge of the fourth weight portion where the fourth weight portion and the inner surface of the sole portion are connected on the side of the center of gravity of the head has an arc shape having a center on the side of the center of gravity of the head. The golf club head of claim 10, wherein the golf club head is curved. The golf club head according to any one of claims 1 to 11, wherein the depth of the center of gravity is 29 to 32 (mm). 13. The golf club head according to claim 1, wherein the height of the center of gravity is 11 to 16 (mm). 14. The height of the sweet spot from the horizontal plane is located in the range of 17 to 22 (mm) in a standard state in which the golf club head is placed on the horizontal plane at the specified lie angle and loft angle. The golf club head according to any one of 1. In a standard state in which the golf club head is placed on a horizontal plane at a specified lie angle and loft angle, left and right moments of inertia, which are moments of inertia about a vertical axis passing through the center of gravity of the head, are 2200 to 2800 (g·cm ² ). The golf club head according to any one of claims 1 to 14, wherein

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